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Journal articles on the topic 'Filter clogging'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Liu, Chunye, Rui Wang, Wene Wang, Xiaotao Hu, Wanying Wu, and Fulai Liu. "Different Irrigation Pressure and Filter on Emitter Clogging in Drip Phosphate Fertigation Systems." Water 14, no. 6 (2022): 853. http://dx.doi.org/10.3390/w14060853.

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Irrigation pressures and filters have a significant influence on emitter clogging in drip fertigation systems. Exploring the anti-clogging performance of emitters at different irrigation pressures (80, 90, 100 kPa; 40, 50, 60 kPa) and filters (the disc filter with an aperture of 125 μm, the screen filter with an aperture of 125μm, and the screen filter with an aperture of 200 μm) can provide suitable guidance for the design and operation of drip fertigation systems. The average relative discharge (Dra), the Christiansen uniformity coefficient (CU), and the differential pressure (DP) were analy

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2

Nam Lee, Gang, Tien Trung Duong, Sangho Park, Mansoo Kim, and Kwang Hyo Jung. "Study on filter clogging and filtration performance evaluation of Ballast Water Management System (BWMS) using analytical and numerical methods." Brodogradnja 76, no. 2 (2025): 1–17. https://doi.org/10.21278/brod76207.

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Filter clogging is a critical issue in ballast-water management systems (BWMSs) and is caused by the accumulation of sediment deposits and particles in water, particularly under high total suspended solid (TSS) conditions. Despite its significance, studies focusing on the prediction and prevention of clogging, as well as detailed investigations into its mechanisms, remain limited. In this study, an analytical method based on Darcy’s law is devised to predict clogging occurrences and filter performance is evaluated via computational fluid dynamics (CFD) simulations. Additionally, a coupled CFD-

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3

Bang, Ki Woong, Jin Chul Joo, Jin Ho Kim, et al. "Application of Bottom Ash as Filter Media for Construction Site Runoff Control." Water 12, no. 4 (2020): 990. http://dx.doi.org/10.3390/w12040990.

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The potential application of bottom ash (BA) for construction site runoff control as an alternative filter media with high removal efficiency of total suspended solids (TSS) and longer operation period were evaluated. Both lab-scale single-layer and pilot-scale multi-layer filtration experiments were performed using BA filter media with different particle sizes and various volumetric flow rates. Due to the mesoporous, irregular, and spherical shape of gravel-size BA filter media used in this study, relatively low surface area, negligible pore volume, and greater pore size were observed. Both T

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4

Tophoff, Lukas, Holger Schüttrumpf, Frank Heimbecher, Christian Vollmer, Bodo Philipp, and Yulduzkhon Abdullaeva. "Field Investigations and Service Life Assessment of Geosynthetic Filters in Tidally Influenced Revetments in Cases of Ochre Clogging." Water 16, no. 13 (2024): 1840. http://dx.doi.org/10.3390/w16131840.

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In recent decades, there have been individual cases of damage to the revetments of the German North Sea estuaries due to clogging by precipitated ochre products. This process is defined as ochre clogging and has been extensively explained in the literature. The primary aim of the investigations was to better understand the clogging process under in situ conditions and the causative environmental conditions surrounding the filters. Extensive in situ investigations were therefore carried out. It was found that a permeability reduction in geotextile filters can be strongly accelerated by ochre cl

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5

Wang, Shuaijie, Haitao Wang, Xuefeng Qiu, et al. "Study on the Performance of Filters Under Biogas Slurry Drip Irrigation Systems." Agriculture 15, no. 1 (2024): 30. https://doi.org/10.3390/agriculture15010030.

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Filters are essential components for maintaining the stability of drip irrigation systems, effectively reducing the risk of clogging. However, when applied to slurry drip irrigation systems, the complexity of slurry water quality makes it unclear how different filter types and their combinations affect the hydraulic performance of the system. This study provides a comprehensive performance evaluation of two common filter types and their combinations, considering various flow rates and biogas slurry-to-water ratios under drip irrigation conditions. The results revealed the following key finding

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6

Wu, Zhengguang, Yanjuan Qi, Aihong Kang, Bo Li, and Xueling Xu. "Evaluation of Particulate Matter Capture and Long-Term Clogging Characteristics of Different Filter Media for Pavement Runoff Treatment." Advances in Materials Science and Engineering 2020 (August 27, 2020): 1–15. http://dx.doi.org/10.1155/2020/5012903.

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The removal of particulate matter (PM) by filter media during filtration process can mitigate the pavement runoff pollution effectively. However, this process also makes the filter media prone to clogging. To better understand the size ranges of PM captured by filter media and the subsequent impact on the clogging process, filtration test and clogging test were conducted on five types of filter media. The effect of layer thickness and grain size of different filter media on particle removal efficiency was evaluated, based on the results of PM removal rate and the particle size distribution. Th

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7

Reddi, Lakshmi N., Ming Xiao, Malay G. Hajra, and In Mo Lee. "Physical clogging of soil filters under constant flow rate versus constant head." Canadian Geotechnical Journal 42, no. 3 (2005): 804–11. http://dx.doi.org/10.1139/t05-018.

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In this study, the differences in soil filter clogging are evaluated under two operating conditions: constant head and constant flow rate. Whereas filters placed around well screens and leachate collection systems are subjected to a constant flow rate, filters in earth dams and pavement drainage systems operate under constant or slightly varying heads. In this study, the experiments revealed similar permeability reductions with respect to time in both cases; however, the permeability reduction under the condition of constant head occurred in much fewer pore volumes than under the condition of

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8

Lee, Byungsik. "Convolutional Neural Network Model for Estimating Clogging of Ash-Mixed Sand Filters." Journal of the Korean Society of Hazard Mitigation 21, no. 4 (2021): 159–68. http://dx.doi.org/10.9798/kosham.2021.21.4.159.

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A deep learning model was developed to estimate the clogging of voids in bottom-ash-mixed sand filters. Filter clogging is characterized by a decrease in the infiltration ratio with an increase in the outflow. The estimation of clogging for time-series forecasting is a regression problem. Various algorithms for regression problems have been applied through machine learning and deep learning. Despite the various algorithm applications, an application for clogging appears to be emerging. Studies are required to develop dependable models for precisely predicting clogging. A convolutional neural n

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9

Alimohammadi, Hossein, Kristina Vassiljeva, Eduard Petlenkov, et al. "Gray Box Time Variant Clogging behaviour and Pressure Drop Prediction of the Air Filter in the HVAC System." E3S Web of Conferences 246 (2021): 10002. http://dx.doi.org/10.1051/e3sconf/202124610002.

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Identification and prediction of clogging behavior in heating, ventilation, and air conditioning (HVAC) filters is crucial to avoid issues such as system overheating, energy waste, lower indoor air quality, etc. Researchers are focusing more on the particle loading characteristics of a filter medium in a laboratory environment under steady-state conditions, fixed particle concentrations, area of porosity, dust feed and volumetric flow rate. However, recent research still shows uncertainties in modeling as well as the implementation problems of constructing the HVAC laboratory test bench and eq

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10

Alavi Moghaddam, M. R., Y. Guan, H. Satoh, and T. Mino. "Filter clogging in coarse pore filtration activated sludge process under high MLSS concentration." Water Science and Technology 54, no. 10 (2006): 55–66. http://dx.doi.org/10.2166/wst.2006.728.

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Coarse pore filtration activated sludge process is a type of hybrid process in which the secondary settling tank of the conventional activated sludge process is replaced by non- woven and coarse pore filter modules. The filter has pores, which are irregular in shape, and much bigger than micro-filtration membrane pores in size. The objective of the study is to find out the effect of the microbial community structure on filter clogging in the coarse pore filtration activated sludge process under high MLSS concentration in aerobic and anoxic/aerobic (A/A) conditions. Filter clogging started from

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11

Dalri, Alexandre B., Gilmar O. Santos, Geffson de F. Dantas, Rogério T. de Faria, José R. Zanini, and Luiz F. Palaretti. "Performance of drippers in two filtering systems using sewage treatment effluent." Revista Brasileira de Engenharia Agrícola e Ambiental 21, no. 6 (2017): 363–68. http://dx.doi.org/10.1590/1807-1929/agriambi.v21n6p363-368.

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ABSTRACT The objective of this study was to evaluate the performance of three models of drippers using treated sewage effluent, pure and diluted, and two types of filters, screen and disc. The treated sewage effluent used in the experiment was collected from the city’s treatment plant. The experiment included 12 lateral lines with three types of emitters to apply pure (100%) and diluted (50%) effluent filtered by screen and disc filters. The combination of those factors set the treatments: T1 (50% effluent diluted in fresh water filtered by a screen filter); T2 (50% effluent diluted in fresh w

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12

Shuraits, A. L., A. V. Birykov, and A. P. Usachev. "DEVELOPMENT OF A CALCULATION METHODFOR TWO-STAGE NATURAL GAS PURIFICATION PLANTS FROM MECHANICAL IMPURITIES." Russian Journal of Building Construction and Architecture, no. 1(49) (February 24, 2021): 54–65. http://dx.doi.org/10.36622/vstu.2021.49.1.005.

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Statement of the problem. Currently, there is no methodology for calculating the degree of clogging of a multilayer filter cartridge taking into account the prevention of deposition of mechanical impurities in the gap between the coarse and fine filter cylindrical filter cartridges. In this regard, the development of such a technique is an urgent task. Results. In this paper, we propose a calculation method for determining the average integral degree of clogging of multilayer cylindrical filter cartridges with mechanical impurities and pressure loss on them which take into account the preventi

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13

Valmari, Tuomas, Matti Lehtimäki, and Aimo Taipale. "Filter Clogging by Bimodal Aerosol." Aerosol Science and Technology 40, no. 4 (2006): 255–60. http://dx.doi.org/10.1080/02786820500543282.

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14

Redner, S., and Somalee Datta. "Clogging Time of a Filter." Physical Review Letters 84, no. 26 (2000): 6018–21. http://dx.doi.org/10.1103/physrevlett.84.6018.

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15

Ismail, Nova Risdiyanto, Agung Suprapto, Dadang Hermawan, Purbo Suwandono, and Leo Hutri Wicaksono. "Implementation of sediment separator core hole in an effort to reduce the filter clogging rate of CAT 16M Grader." ARMATUR : Artikel Teknik Mesin & Manufaktur 5, no. 1 (2024): 192–99. http://dx.doi.org/10.24127/armatur.v5i1.5347.

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    The Cat 16M Grader is a heavy equipment that is widely used to support mining operations. The development of this heavy equipment is required to use biodesel fuel (B30). The problem with B30 fuel is oxidation which results in the formation of sediment and can cause filter clogging. Filter clogging can affect engine power and filter replacement time. From these problems, the researcher proposed to modify the number of sediment separator core holes to reduce the filter clogging rate on the Cat 16M grader. Modified number of sediment separator core holes are 40, 20 and

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16

Шурайц, А. Л., А. В. Бирюков, and А. П. Усачев. "DEVELOPMENT OF A CALCULATION METHOD FOR TWO-STAGE NATURAL GAS PURIFICATION PLANTS FROM MECHANICAL IMPURITIES." НАУЧНЫЙ ЖУРНАЛ СТРОИТЕЛЬСТВА И АРХИТЕКТУРЫ, no. 3(59) (October 1, 2020): 32–42. http://dx.doi.org/10.36622/vstu.2020.59.3.003.

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Состояние проблемы. В настоящее время отсутствует методика расчета степени засорения многослойного фильтрующего картриджа, учитывающая недопущение осаждения механических примесей в зазоре между цилиндрическими фильтрующими картриджами грубой и тонкой очистки. В этой связи разработка такой методики является актуальной задачей. Результаты. В данной работе предложена методика расчета по определению среднеинтегральной степени засорения многослойных цилиндрических фильтрующих картриджей механическими примесями и потери давления на них, которые учитывают недопущение осаждения механических примесей в

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17

Zenfira Huseynli, Ali Mansurov, Zenfira Huseynli, Ali Mansurov, and Gulshad Aghayeva, Rovshana Aliyeva Gulshad Aghayeva, Rovshana Aliyeva. "INCREASING THE PERFORMANCE OF CHRISTMAS TREES IN SANDY CONDITIONS." ETM - Equipment, Technologies, Materials 18, no. 06 (2023): 108–14. http://dx.doi.org/10.36962/etm18062023-108.

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The key reason to make this research is to find solutions for mechanical impurities, or commonly sand clogging in christmas trees. As it’s known, christmas trees are equipment made for controlling flow of oil and gas, which consists of several gauges and valves for specific purposes. This equipment installed on wells are constantly clogged with various impurities. These mechanical consistency interrupt christmas tree’s work and cause wears and tears which leads to failure of system and overall oil production delay. Thus, frequent maintenance is required. There are two main ways to release the

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18

McIsaac, Reagan, and R. Kerry Rowe. "Effect of filter–separators on the clogging of leachate collection systems." Canadian Geotechnical Journal 43, no. 7 (2006): 674–93. http://dx.doi.org/10.1139/t06-030.

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This paper reports the results obtained after 6 years operation of nine mesocosm experiments that simulate the 50 cm of the drainage layer closest to the leachate collection pipe in a landfill. Five different design configurations were examined involving a 300 mm thick layer of coarse (38 mm) gravel. The designs differed in terms of the presence, nature, and location of a filter–separator layer either at the waste–gravel interface or partway through the gravel. A nonwoven geotextile filter–separator (GTF/S) is shown to reduce clogging of the gravel relative to the no filter–separator or woven

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19

Wang, Jun, Yongli Yang, Hongtao Fu, et al. "Improving consolidation of dredged slurry by vacuum preloading using prefabricated vertical drains (PVDs) with varying filter pore sizes." Canadian Geotechnical Journal 57, no. 2 (2020): 294–303. http://dx.doi.org/10.1139/cgj-2018-0572.

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Prefabricated vertical drains (PVDs) have been used extensively to accelerate the consolidation rate of dredged slurry. While some fine particles from dredged slurry can easily squeeze through the filter into the drainage channel, many cannot. As such, these soil particles deposit on the filter surface causing partial clogging of the drainage path. Although the pore size of filter is recognized as an important factor that influences PVD clogging, the standards for determining the pore size of the filter are lacking. To this end, the traditional gradient ratio tests with four different filter p

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20

Nieć, Jakub, Natalia Walczak, Marcin Spychała, and Zbigniew Walczak. "The Influence of Fibers from Domestic Laundry Wastewater on the Clogging Process of a Filter." Water 16, no. 21 (2024): 3137. http://dx.doi.org/10.3390/w16213137.

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This study presents the impact of the size and shape of particles in laundry wastewater on the clogging process of a porous material. Clogging can be defined as a mechanical limitation of flow through porous media. The process of mechanical clogging was investigated in this study. The research was conducted in laboratory conditions in a filter column filled with glass beads whose diameter corresponded to coarse sand. The results reveal the influence of graywater quality on filter hydraulic conductivity and bed clogging, showing the impact of fiber particles in wastewater (sewage from home laun

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21

Hatt, B. E., N. Siriwardene, A. Deletic, and T. D. Fletcher. "Filter media for stormwater treatment and recycling: the influence of hydraulic properties of flow on pollutant removal." Water Science and Technology 54, no. 6-7 (2006): 263–71. http://dx.doi.org/10.2166/wst.2006.626.

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Improved urban water management in Australia is of national importance. Water resources are stretched and urban runoff is a recognized leading cause of degradation of urban waterways. Stormwater recycling is an option that can contribute to easing these problems. Biofilters are effective structural stormwater pollution control measures with the potential for integration into stormwater treatment and recycling systems. However, premature clogging of biofilters is a major problem, with resulting decreased infiltration capacity (and hence the volume of stormwater the system can detain) and increa

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22

Wakelin, S. A., D. W. Page, P. Pavelic, A. L. Gregg, and P. J. Dillon. "Rich microbial communities inhabit water treatment biofilters and are differentially affected by filter type and sampling depth." Water Supply 10, no. 2 (2010): 145–56. http://dx.doi.org/10.2166/ws.2010.570.

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Factors affecting microbial diversity (richness) and community structure in biofilter columns were investigated. At a pilot filtration plant, granular activated carbon (GAC), anthracite and sand-based filters were used to treat stormwater from an urban catchment. After 12 weeks operation, sand media filters clogged (hydraulic conductivity declining by 90%) and all filters were destructively sampled. All biofilters had similar levels of polysaccharide in the surface layer, however only the sand columns clogged. This clogging may have been due to a combination of polysaccharide and small particl

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23

Song, Zhi Xin, Shao Yuan Bai, and Jian Xu. "Effect of Flow Field Distribution on the Clogging of Subsurface Flow Constructed Wetlands." Advanced Materials Research 610-613 (December 2012): 1349–53. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.1349.

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this review summarizes an important factor of clogging in subsurface flow constructed wetlands ¬(SSF)—field distribution. The efficiency of filter media and the spatial distribution of biological growth are determined by the flow field distribution directly. If the flow field distribution is un-uniform, it would accelerate the clogging of substrate. The influencing factors for flow field distribution, including hydraulic loads, properties of filter media, filling structures and root distribution were investigated, and the clogging reasons were discussed additionally. At last, this study showed

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24

Oota-Ishigaki, Akiko, Takashi Yamane, Daisuke Sakota, Ryo Kosaka, Osamu Maruyama, and Masahiro Nishida. "In vitro hemocompatibility investigation for the development of low-flow centrifugal blood pumps with less platelet clogging." International Journal of Artificial Organs 45, no. 4 (2021): 431–37. http://dx.doi.org/10.1177/03913988211052570.

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Low-flow blood pumps rated under 1 L/min are emerging for new medical applications, such as hemofiltration in acute use. In those pumps, platelet adhesion and aggregation have to be carefully considered because of clogging risk in the filter part. To find an acceptable hemocompatibility that can be applied to low-flow centrifugal blood pump design, the platelet aggregation index, clogging on a micromesh filter, and the hemolysis index were investigated using a low-flow blood pump designed for hemofiltration use. We conducted circulation testing in vitro using fresh porcine blood and two centri

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25

Lee, D. J. "Filter medium clogging during cake filtration." AIChE Journal 43, no. 1 (1997): 273–76. http://dx.doi.org/10.1002/aic.690430132.

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26

Xu, QiaoLing, Li Wang, Ping Wang, XueYuan Wen, and Feng Zhang. "Clogging in Vertical Flow Constructed Wetlands: Causes for Clogging and Influence of Decontamination." Ecological Chemistry and Engineering S 29, no. 1 (2022): 65–75. http://dx.doi.org/10.2478/eces-2022-0007.

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Abstract With the continuous operation of constructed wetlands, substrate clogging is issue. In order to solve the problem, there is practical significance to understand the causes for clogging in constructed wetlands. Two pilot-scale vertical flow constructed wetlands were established, namely, CW-B and CW-C. By studying the relationship between the accumulation of different substances and the banked-up water area, it was found that the accumulation of non-filter substances and total solids was an important reason for the clogging of the substrate, and the accumulation degree of non-filter ino

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27

Sultana, Sarmin, and Kazi Matin Ahmed. "Assessing risk of clogging in community scale managed aquifer recharge sites for drinking water in the coastal plain of south-west Bangladesh." Bangladesh Journal of Scientific Research 27, no. 1 (2016): 75–86. http://dx.doi.org/10.3329/bjsr.v27i1.26226.

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Community scale managed aquifer recharge (MAR) has been implemented by infiltrating pond and rooftop rainwater into shallow, locally confined brackish aquifers in the southern deltaic plains of Bangladesh for providing safe drinking water. This paper mainly deals with the risks of physical clogging and the issues of clogging related to aquifer material, design, drilling and construction methods at 20 sites. Risk of chemical and biochemical clogging has also been briefly discussed. High turbidity in the source pond water is mainly responsible for physical clogging. In order to reduce the turbid

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28

Kalore, Shubham, and G. L. Sivakumar Babu. "Recent developments in design criteria for granular and geotextile filters." E3S Web of Conferences 368 (2023): 02015. http://dx.doi.org/10.1051/e3sconf/202336802015.

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Granular and geotextile filters are commonly provided in several hydrological infrastructures to limit soil erosion and allow unimpeded water seepage. The success of a filter depends on forming a bridging structure, which is governed by the grain size distribution of soil and the constriction size distribution of filter. Currently, the retention requirement is satisfied considering representative grain and opening size, whereas the hydraulic conductivity requirement is satisfied considering empirical factors for avoiding excessive clogging. In this paper, the design criteria for granular and g

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Wang, Xu, Yonghong Zhang, Liqin Fan, and Jingli Shen. "Salt Drainage Efficiency and Anti-Clogging Effects of Subsurface Pipes Wrapped with Geotextiles." Water 16, no. 10 (2024): 1392. http://dx.doi.org/10.3390/w16101392.

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Subsurface drainage pipes covered with filters and geotextiles are the key to preventing clogging and ensuring efficient drainage. To improve the salt discharge efficiency of these subsurface drainage pipes, different layers of geotextiles were set outside the pipes with the aid of uniform gravel filters. This paper reports our findings from laboratory simulation of subsurface drainage pipes and experiments. The study examined the influence of different layers of geotextiles on the drainage efficiency, salt discharge effects of subsurface drainage pipes, and the effect of superimposed geotexti

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Ribeiro, Túlio Assunção Pires, José Euclides Stipp Paterniani, Rogério Pereira da Silva Airoldi, and Marcelo Jacomini Moreira da Silva. "Performance of non woven synthetic fabric and disc filters for fertirrigation water treatment." Scientia Agricola 61, no. 2 (2004): 127–33. http://dx.doi.org/10.1590/s0103-90162004000200001.

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Obstruction of emitters caused by the presence of solid particles in the water raises the cost and maintenance of trickle irrigation systems, and might compromise their utilization. This research was performed through test fields, with the objective of evaluating the performance of a disc filter (130 microns) and a non woven synthetic fabric filter on the removal of physical, chemical and biological impurities from the irrigation water, which may cause emitter obstruction during fertirrigation processes. The evaluation criteria of the impurities present in the irrigation water, were based on s

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Bari, S., C. W. Yu, and T. H. Lim. "Filter clogging and power loss issues while running a diesel engine with waste cooking oil." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 216, no. 12 (2002): 993–1001. http://dx.doi.org/10.1243/095440702762508245.

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As with other vegetable oils, the high viscosity of waste cooking oil (WCO) poses some challenges to engine operation. One of them is filter clogging. In this research, it was found that heating to above 55°C was effective in preventing clogging. However, the head loss across the filter was about 6 times higher than that of diesel. Generally, the lower calorific values of vegetable oils are held responsible for the reduction in maximum power of the engine. While running with WCO, the maximum power of the engine was reduced by 10.9 per cent from that with diesel. Raising the fuel tank level and

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32

Spychala, M., and R. Blazejewski. "Sand filter clogging by septic tank effluent." Water Science and Technology 48, no. 11-12 (2004): 153–59. http://dx.doi.org/10.2166/wst.2004.0828.

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The aim of this study was to characterise conditions and factors affecting fine sand clogging by septic tank effluent on the basis of physical modelling. The physical model consisted of 12 sand columns dosed with sewage from one household (5 persons), preliminary treated in a septic tank. Hydraulic loadings of the sand filters were equal to 82 mm/d. The mean discharge from sand columns, measured as the effluent volume collected during 10 minutes, decreased significantly over the experiment period from 34 cm3/min in August 2000 to 20 cm3/min in August 2001 at the same temperature of about 20°C.

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Salwa, M. Z. M., Muaz Mohd Zaini Makhtar, and Mohammad Tamizi Selimin. "Predicting physical clogging of modular paver equipped with filter media." IOP Conference Series: Earth and Environmental Science 1135, no. 1 (2023): 012012. http://dx.doi.org/10.1088/1755-1315/1135/1/012012.

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Abstract Porous pavements are simple to retrofit, good at improving the hydrology and quality of the water, but prone to clogging. There is little knowledge on the physical clogging processes through these systems, even though they play a significant role in the lifespan of porous pavements. This study’s objectives were to comprehend the primary physical mechanisms that control physical clogging and create a straightforward hexagonal modular (HM) model that can forecast physical congestion. A filtration system with a layered filter media granular activated carbon (GAC) and sand was installed.

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Khomutov, A. O., A. V. Biryukov, A. P. Usachev, and O. A. Kutsigina. "THEORETICAL AND EXPERIMENTAL INVESTIGATIONS OF IDENTIFYING PRESSURE LOSS IN FILTER ELEMENTSOF COARSE AND FINE GAS PURIFICATION WHEN PLACED IN ONE BODY." Russian Journal of Building Construction and Architecture, no. 1(53) (February 21, 2022): 29–38. http://dx.doi.org/10.36622/vstu.2022.53.1.003.

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Statement of the problem. Reliable operation of modern high-precision gas flow reduction and control systems located in cabinet, block and capital gas distribution points calls for the use of two-stage cylindrical gas purification plants containing preliminary and fine filters. An urgent task is to design and scientifically substantiate the use of cost-effective two-stage natural gas purification devices located at gas distribution points as well as the development of analytical calculation methods for identifying pressure losses in the filter elements of two-stage cylindrical installations an

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Kayser, K., and S. Kunst. "Processes in vertical-flow reed beds: nitrification, oxygen transfer and soil clogging." Water Science and Technology 51, no. 9 (2005): 177–84. http://dx.doi.org/10.2166/wst.2005.0314.

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Vertical-flow reed beds (VF) with intermittent feeding are extremely reliable regarding aerobic processes. For a save operation with high nitrification rates and without soil clogging it is essential to preserve aerobic conditions in the filter. The challenge is to keep aerobic conditions in the filter without oversizing the system (economical aspects). It is very difficult to determine the current oxygen content in the filters because it ultimately results from complex interactions of a large number of different influencing parameters such as loading rate, degree of clogging, temperature, and

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Davis, Goldie, Edwin I. Ekwue, and Hazi Md Azamathulla. "Examination of the Efficiency of Fabric Filter Media in Two-Stage Crossflow Pre-Filtration of Turbid Surface Water Using the Davies Flow Equation." West Indian Journal of Engineering 46, no. 2 (2024): 57–63. http://dx.doi.org/10.47412/uixv2590.

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Clogging of rapid sand filters during heavy rainfall causes surface water treatment plants to stop their operations until the river water turbidity decreases to a level that the rapid sand filter is capable of filtering. As clogging of rapid sand filters is impediment in surface water treatment, two-stage crossflow pre-filtration with fabric filter media (linen, crepe-backed satin, burlap, and cotton) was considered in a previous study by Davis and Ekwue (2020) as a possible solution. Pre-filtration with linen fabric filter medium was found to be the most efficient at retaining particles. The

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Ehlinger, F., J. M. Audic, D. Verrier, and G. M. Faup. "The Influence of the Carbon Source on Microbiological Clogging in an Anaerobic Filter." Water Science and Technology 19, no. 1-2 (1987): 261–73. http://dx.doi.org/10.2166/wst.1987.0207.

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Using two different substrates, glucose and a mixture of volatile fatty acids, the influence of the types of bacteria on the appearance of microbiological clogging in anaerobic filters was studied. The clogging was detected by lithium tracings and head-loss profiles. The composition of the biofilm and the electron-microscopy were used to illustrate the phenomenon. The clogging is due to polysaccharides secreted by acidogenic bacteria.

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Pucher, Bernhard, and Guenter Langergraber. "The State of the Art of Clogging in Vertical Flow Wetlands." Water 11, no. 11 (2019): 2400. http://dx.doi.org/10.3390/w11112400.

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Clogging in vertical flow (VF) wetlands is an important process influencing water purification processes. The main contributing factors are the growth of microorganisms within the filter media, the accumulation of suspended solids on top of the wetland, as well as within the filter media. Both processes lead to a decrease of the available pore space, hence changing the soil’s hydraulic properties. This will alter the water flow and cause malfunctioning of the system. This paper summarizes the state of the art of the prevailing physical, biological and chemical processes influencing clogging in

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Jonsson, Lena, Elzbieta Plaza, and Bengt Hultman. "Experiences of nitrogen and phosphorus removal in deep-bed filters in the Stockholm area." Water Science and Technology 36, no. 1 (1997): 183–90. http://dx.doi.org/10.2166/wst.1997.0042.

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Experimental studies of nutrient removal in a discontinuous downflow two-media filter on a pilot plant scale are described and compared with previously reported results from a continuous upflow filter (DynaSand) studied at full scale. Under controlled conditions both filters show low effluent values of total nitrogen and phosphorus. Removal mechanisms were more complex in the discontinuous downflow filter owing to the use of two media, deposition of sludge on the filter surface, and changes of the biological activity over time after backwashing. The discontinuous downflow filter was much influ

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Wang, Dong-bo, Zi-yun Zhang, Xiao-ming Li, et al. "Effects of earthworms on surface clogging characteristics of intermittent sand filters." Water Science and Technology 61, no. 11 (2010): 2881–88. http://dx.doi.org/10.2166/wst.2010.180.

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Intermittent sand filters (ISFs) are effective and economical in treating wastewater, but they are easy to clog up. To explore a feasible and simple method to alleviate clogging, two pilot-scale ISFs were constructed, one of which contained earthworms and the other did not. During the operation, the effects of earthworms on the hydraulic behaviour of ISFs were investigated. The results showed that both ISFs exhibited good performance in wastewater treatment. However, they showed different hydraulic characteristics although operated at the same organic loading rate (approximately 300 g m−2 d−1)

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Lee, Byungsik. "A Neural Network Model to Estimate the Clogging of Ash Mixed Sand Filter." Journal of the Korean Society of Hazard Mitigation 23, no. 3 (2023): 147–53. http://dx.doi.org/10.9798/kosham.2023.23.3.147.

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Infiltration filters of LID facilities are frequently confronted with clogging of pores by contaminants. To avoid malfunctioning of LID facilities, filters should be maintained according to the degree of clogging. In this study, clogging was characterized by curves representing the correlation between infiltration rate (<i>Q</i>) and infiltration quantity (<i>IR</i>). To estimate the degree of clogging, a regression neural network model was developed to estimate the label (infiltration quantity) corresponding to the selected features (ash mix ratio, infiltration rate, a

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Franco, Monalisa, Gabriela K. e. Silva, and José E. S. Paterniani. "Water treatment by multistage filtration system with natural coagulant from Moringa oleifera seeds." Engenharia Agrícola 32, no. 5 (2012): 989–97. http://dx.doi.org/10.1590/s0100-69162012000500018.

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This study presents an evaluation of a pilot multistage filtration system (MSF) with different dosages, 131 mg L-1 and 106 mg L-1, of the natural coagulant extracted from Moringa oleifera seeds in pre-filtration and slow filtration stages, respectively. The system was comprised by a dynamic pre-filter unit, two upflow filters in parallel and four slow filters in parallel, and in one of the four filters had the filter media altered. The performance of the system was evaluated by monitoring some water quality parameters such as: turbidity, apparent color and slow filter load loss. The stages tha

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Ménoret, C., C. Boutin, A. Liénard, and F. Brissaud. "Use of recycling through medium size granular filters to treat small food processing industry effluents." Water Science and Technology 45, no. 12 (2002): 225–32. http://dx.doi.org/10.2166/wst.2002.0430.

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Currently there are no suitable wastewater treatment systems for effluents from small food processing industries (dairy, cheese, wine production). Such raw sewages are characterized by high organic matter concentrations (about 10 g COD L−1) and relatively low daily volumes (about 2 m3). An adaptation of attached-growth cultures on fine media processes, known to be easy and inexpensive to use, could fit both the technical and economical context of those industries. Coarser filter particle size distributions than those normally used allow a better aeration and reduce clogging risk. The transit t

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Bao, Shufeng, Lingfeng Guo, Zhiliang Dong, Ruibo Zhou, Shuangxi Zhou, and Jian Chen. "Clogging Behaviors in PVD and Their Evaluation Criteria for Dredged Mud Slurry." Water 15, no. 24 (2023): 4206. http://dx.doi.org/10.3390/w15244206.

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During the consolidation period of vacuum preloading drainage of dredged mud slurry, the clogging behaviors of the filter drainage structural layers and the core boards of prefabricated vertical drains (PVD) determine the drainage capacities of PVD. However, currently, there is a lack of comprehensive research on the evaluation criteria for these two clogging behaviors. Therefore, based on typical dredged mud slurry, typical geomembranes, and raw material core boards with different bending forms, relevant macro and micro-scale experimental studies have been carried out in this study. The resea

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Lindmark, Krister, and K. Gunnar Engström. "Use of polyester leukocyte elimination filters in blood filterability research." Biorheology: The Official Journal of the International Society of Biorheology 35, no. 2 (1998): 131–40. http://dx.doi.org/10.1177/0006355x1998035002003.

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We tested a new routine to eliminate leukocytes for blood rheology measurements using commercial leukocyte absorbing filters (here PALL RC400). These filters were punched out and fitted in smaller chambers through which blood was filtered under controlled suction pressure ( $<30$ mm Hg). This technique resulted in a very effective leukocyte elimination to 0.0022% but also a platelet reduction to 0.2%. The process causes a small but significant hemolysis with free hemoglobin, of the order of 0.06% of the filtered erythrocytes. A small fraction of the erythrocytes were retained in the filter,

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Ahn, Jaeyoon, Dongseop Lee, Shinin Han, Youngwook Jung, Sangwoo Park, and Hangseok Choi. "Experimental study on performance of sand filter layer to remove non-point source pollutants in rainwater." Water Supply 17, no. 6 (2017): 1748–63. http://dx.doi.org/10.2166/ws.2017.056.

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Abstract Clogging characteristics of conventional sand filter layers with different grain-size distributions were experimentally studied to estimate their filtration capacity to capture non-point source pollutants in an artificial rainwater reservoir. A series of laboratory-scale chamber tests was conducted for artificial urban runoff synthesized with non-point source pollutants collected from a real road in Seoul, Korea. In addition, an analytical filtration model for estimating removal of non-point source pollutants was adopted considering the clogging characteristics. To evaluate the perfor

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Zhou, Yuan, Ling Yun Zhang, and Zhi Hao Lu. "Effects of Anti-Clogging in Ultra-Soft Soils Using Different Composite Filter Material." Advanced Materials Research 1101 (April 2015): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amr.1101.3.

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An experimental study on drainage of different composite filter material in Wenzhou ultra-soft soils was carried out, to investigate the effects of anti-clogging for these composite material. A new instrument was designed to simulate draining process of the ultra-soft soils under vacuum loadings. Based on the experimental results in the form of pump quantity of water, the average settlement of the sludge, the pumping rate and the water content, a comparison was made among six composite filter material (e.g., PVA-1, PVA-2, SAP, superfine fiber, coral cashmere fiber and bamboo fiber) and a tradi

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Fridrikhson, V. L., O. I. Kryvonoh, V. V. Kryvonoh, and L. S. Orlova. "Predicting the mechanical colmatation of nonwoven geotextiles." Hydrodynamics and Acoustics 3(93), no. 3 (2024): 245–52. https://doi.org/10.15407/jha2024.03.245.

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Colmatation, in which the conductive channels are clogged with solid microparticles, leads to the loss of performance of filtering devices used in everyday life and technology. This creates a need to develop criteria to assess the likely need to replace the working parts of filters. However, existing engineering methods are not enough to calculate the change in the degree of filter clogging during its operation under certain conditions. Based on this, a new theoretical and experimental approach to solving this problem is proposed. The pore structure of thin fibrous-porous filters that differ i

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Kandra, Harpreet Singh, Ana Deletic, and David McCarthy. "Assessment of Impact of Filter Design Variables on Clogging in Stormwater Filters." Water Resources Management 28, no. 7 (2014): 1873–85. http://dx.doi.org/10.1007/s11269-014-0573-7.

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Calisir, Mehmet D., Melike Gungor, Ali Toptas, Utkay Donmez, Ali Kilic, and Semistan Karabuga. "Clogging performance of micro/nanofibrous laminated composite air filter media." Journal of Industrial Textiles 52 (August 2022): 152808372211130. http://dx.doi.org/10.1177/15280837221113084.

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The performance of fibrous filter media relies on factors such as particle capture efficiency, pressure drop and clogging time. Fiber diameter, porosity and packing density are important web-based factors to improve final filtration performance. In this study, composite nonwoven webs were produced using spunbonded, meltblown and electroblown mats to obtain filter media with different fiber diameter, porosity and packing density. Such a layered composite approach caused huge differences in porosity and packing density, which resulted with improved clogging performance. The average fiber diamete

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