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Artículos de revistas sobre el tema "Aerated package treatment systems"

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Publicado: 4 de junio de 2021
Última modificación: 20 de febrero de 2023

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1

García, J., R. Mujeriego, A. Bourrouet, G. Peñuelas, and A. Freixes. "Wastewater treatment by pond systems: experiences in Catalonia, Spain." Water Science and Technology 42, no. 10-11 (November 1, 2000): 35–42. http://dx.doi.org/10.2166/wst.2000.0603.

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An evaluation of the 24 existing pond systems for treatment of urban wastewater in Catalonia (north-eastern Spain) was conducted in 1997-1998. The evaluation covered 13 aerated ponds, 7 waste stabilization ponds (WSP), and 4 maturation ponds added to conventional biological wastewater treatment plants (WWTP). The technical characteristics of the pond systems were obtained through a survey completed during several visits to the plants. Performance data was supplied by the Catalonia Wastewater Agency and the monthly monitoring campaigns conducted during 12 months in five WWTP. The average ratio
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2

Hulsman, A., and C. D. Swartz. "Development of an Improved Compact Package Plant for Small Community Wastewater Treatment." Water Science and Technology 28, no. 10 (November 1, 1993): 283–88. http://dx.doi.org/10.2166/wst.1993.0245.

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The challenges facing the design and operation of small community wastewater treatment plants are discussed. The package plant concept is considered and the consequent development of a compact intermittently aerated activated sludge package plant is outlined. A four month trial period, comprising the first part of the evaluation, is described. Results from this trial show that the plant can serve communities of up to 300 p.e. and that treated effluent quality conforms to the General South African Standards. The compact design and unique operating regime offer reduced capital and running costs
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3

Nivala, Jaime, Clodagh Murphy, and Andrew Freeman. "Recent Advances in the Application, Design, and Operations & Maintenance of Aerated Treatment Wetlands." Water 12, no. 4 (April 21, 2020): 1188. http://dx.doi.org/10.3390/w12041188.

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This paper outlines recent advances in the design, application, and operations and maintenance (O&M) of aerated treatment wetland systems as well as current research trends. We provide the first-ever comprehensive estimate of the number and geographical distribution of aerated treatment wetlands worldwide and review new developments in aerated wetland design and application. This paper also presents and discusses first-hand experiences and challenges with the O&M of full-scale aerated treatment wetland systems, which is an important aspect that is currently not well reported in the lit
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4

Hanna, K. "Onsite aerobic package treatment systems." Water Research 29, no. 11 (November 1995): 2530–40. http://dx.doi.org/10.1016/0043-1354(95)00094-2.

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5

Hamoda, Mohamed F., and Hamed A. Al-Sharekh. "Sugar wastewater treatment with aerated fixed-film biological systems." Water Science and Technology 40, no. 1 (July 1, 1999): 313–21. http://dx.doi.org/10.2166/wst.1999.0062.

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Wastewater effluents from the sugar industry contain high concentrations of organic materials which are sometimes discharged into the municipal wastewater collection system and processed in wastewater treatment plants along with domestic wastewater. This study examined the performance of a four-compartment, fixed-film system in which the biofilm is attached to submerged ceramic tiles under diffused aeration, known as the aerated submerged fixed-film (ASFF) process. Field experiments were conducted using four ASFF units each of about 100 1 capacity operated at different hydraulic loading rates
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6

Andreadakis, A. D., G. Kondili, D. Mamais, and A. Noussi. "Treatment of septage using single and two stage activated sludge batch reactors systems." Water Science and Technology 32, no. 9-10 (November 1, 1995): 95–104. http://dx.doi.org/10.2166/wst.1995.0674.

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The cyclic or sequencing batch activated sludge process was applied for the treatment of septage originating from cesspools serving non-sewered areas. Single and two stage systems were investigated in bench scale units. The single stage aerated system was capable in removing practically all the biodegradable COD and producing a well stabilised excess sludge with excellent settling and thickening characteristics. With respect to nitrogen the average removal rate was to the order of 70%, but the performance was unstable due to periodic strong inhibition of the nitrification process. Subsequent t
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7

Freeman, A. I., S. Widdowson, C. Murphy, and D. J. Cooper. "Economic assessment of aerated constructed treatment wetlands using whole life costing." Water Science and Technology 80, no. 1 (July 1, 2019): 75–85. http://dx.doi.org/10.2166/wst.2019.246.

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Abstract There is increasing pressure on water treatment practitioners to demonstrate and deliver best value and sustainability for the end user. The aim of this paper is to evaluate the sustainability and economics, using whole life costing, of wastewater treatment technologies used in small community wastewater treatment works (WwTW) of <2,000 population equivalent (PE). Three comparable wastewater treatment technologies – a saturated vertical flow (SVF) aerated wetland, a submerged aerated filter (SAF) and a rotating biological contactor (RBC) – were compared using whole life cost (W
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8

Krauth, Karlheinz. "Application of Preliminary Denitrification to Aerated Sludge Treatment." Water Science and Technology 21, no. 6-7 (June 1, 1989): 699–707. http://dx.doi.org/10.2166/wst.1989.0272.

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Upstream denitrification is a technologically operable process in all treatment systems aimed at maximum nitrification (limited by the supply of organic carbon compounds). This paper considers the design and engineering of the facility, plant arrangements and the results obtained.
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9

Gichana, Zipporah, David Liti, Silke-Silvia Drexler, Werner Zollitsch, Paul Meulenbroek, Joseph Wakibia, Erick Ogello, Peter Akoll, and Herwig Waidbacher. "Effects of aerated and non-aerated biofilters on effluent water treatment from a small-scale recirculating aquaculture system for Nile tilapia (Oreochromis niloticus L.)." Die Bodenkultur: Journal of Land Management, Food and Environment 70, no. 4 (April 21, 2020): 209–19. http://dx.doi.org/10.2478/boku-2019-0019.

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Summary Most recirculation aquaculture systems (RAS) use aerated biofilters to maintain suitable water quality for fish production. However, application of non-aerated biofilters may provide opportunities to lower aeration costs, water usage and concentration of all nitrogenous wastes in the effluent water. Our study aimed at comparing the biofiltration performance characteristics of two biofilters: a conventional aerated biofilter and a non-aerated biofilter receiving the same effluent water from a small-scale RAS. The two biofilters were evaluated in triplicate and tested concurrently for se
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10

DeMers, Larry D., Boyd D. Hanzon, Frank L. Glick, and Robert M. Schultz. "Design Considerations for Package Water Treatment Systems." Journal - American Water Works Association 80, no. 8 (August 1988): 58–61. http://dx.doi.org/10.1002/j.1551-8833.1988.tb03090.x.

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11

Donoso, Natalia, Dion van Oirschot, Jayanta Kumar Biswas, Evi Michels, and Erik Meers. "Impact of Aeration on the Removal of Organic Matter and Nitrogen Compounds in Constructed Wetlands Treating the Liquid Fraction of Piggery Manure." Applied Sciences 9, no. 20 (October 14, 2019): 4310. http://dx.doi.org/10.3390/app9204310.

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The increasing demand for sustainable, robust and cost-efficient wastewater treatment techniques strengthen the implementation of constructed wetlands (CWs) in the agricultural sector. In countries like Belgium (Flanders), the compliance of strict water quality standards and surface area requirements have hindered considerably their application. New wetland designs such as aerated CWs, could help to overcome these challenges. This study evaluated the capacity of artificially aerated mesocosm systems to decrease chemical oxygen demand (COD) concentrations below the 125 mgO2/L limit imposed on i
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12

Roeder, Eberhard, and William G. Brookman. "Assessment of Nitrogen Reduction Limitations in Aerated Onsite Sewage Treatment Systems." Proceedings of the Water Environment Federation 2010, no. 9 (January 1, 2010): 6965–72. http://dx.doi.org/10.2175/193864710798206883.

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13

Ozturk, I., V. Eroglu, and I. Toröz. "Pilot and Full-Scale Treatment Experiences on Paper Mill Effluents." Water Science and Technology 22, no. 9 (September 1, 1990): 255–63. http://dx.doi.org/10.2166/wst.1990.0090.

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In this paper, biological treatability study results of a pilot-scale aerated lagoon treating white-waters from a mechanical groundwood-based pulp and paper mill, and long-term operating experiences on two full-scale aerated lagoon systems are presented. Biological treatability study was conducted in a 200 1 semi-pilot aerated lagoon. The results have shown that five-day Biochemical Oxygen Demand (BOD5) values are less than 50 mg/l for a hydraulic retention time of 5 days. BOD removal rate constant (K) was found as 1.01 per day for 20°C. Bioassay tests were also conducted to evaluate the toxic
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14

Hellström, D., and L. Jonsson. "Evaluation of small wastewater treatment systems." Water Science and Technology 48, no. 11-12 (December 1, 2004): 61–68. http://dx.doi.org/10.2166/wst.2004.0804.

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Different technologies for the treatment of wastewater from single houses have been evaluated by performing measurements at 14 treatment plants installed at different one-family houses located 35 km south-west of Stockholm. The technologies tested were selected in order to deliver high removal efficiencies with respect to organic matter, nitrogen and phosphorus. They also had to fulfil requirements concerning robustness, nutrient recycling, use of natural resources, economy, user-friendliness and hygiene. The systems can be divided into package plants, urine separating systems, blackwater sepa
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15

Freeman, Andrew I., Ben W. J. Surridge, Mike Matthews, Mark Stewart, and Philip M. Haygarth. "New approaches to enhance pollutant removal in artificially aerated wastewater treatment systems." Science of The Total Environment 627 (June 2018): 1182–94. http://dx.doi.org/10.1016/j.scitotenv.2018.01.261.

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16

Daude, D., and T. Stephenson. "Cost-effective treatment solutions for rural areas: design and operation of a new package treatment plant for single households." Water Science and Technology 48, no. 11-12 (December 1, 2004): 107–14. http://dx.doi.org/10.2166/wst.2004.0816.

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The design approach and operation of a newly developed package plant treating domestic sewage from single households were evaluated. Combining submerged aerated filter (SAF) technology with jet aeration and incorporating both into a compact and shallow tank resulted in a cost-effective treatment solution. A trial unit was permanently installed at a rural site, serving a single household. Jet aeration proved to be the best aeration method for the shallow bioreactor design. Further trials revealed a 50% reduction in suspended solids (SS) through the use of a static effluent filter and found that
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17

Sun, Yafei, Junling Pang, Shiyao Wang, Tingting Tao, Xun Fu, Ying Zhang, Bo Sun, and Jing Pan. "Confirmation the optimal aeration parameters for nitrogen removal and nitrous oxide emission in wastewater ecological soil infiltration systems with brown earth." Water Science and Technology 80, no. 1 (July 1, 2019): 144–52. http://dx.doi.org/10.2166/wst.2019.260.

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Abstract Nitrogen removal is an obstacle for the wide application of wastewater ecological soil infiltration (WESI) system in domestic wastewater treatment. In this study, matrix dissolved oxygen (DO), nitrogen removal and nitrous oxide (N2O) emission in aerated pilot WESI systems were investigated under different aeration times (1, 2, 3, 4 and 6 h/d) and aeration rates (1, 2, 3 and 4 L/min). The results showed that aerobic conditions in upper matrix and anoxic or anaerobic conditions in the subsequent matrix were developed in an aerated/non-aerated cycle at the optimal aeration condition of a
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18

Dalentoft, Eva, and Peter Thulin. "The use of aerobic selectors in activated sludge systems for treatment of wastewater from the pulp and paper industry." Water Science and Technology 35, no. 2-3 (February 1, 1997): 181–88. http://dx.doi.org/10.2166/wst.1997.0513.

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Lab-scale have been made with an aerobic selector followed by an aerated reactor. Sulphate mill effluent and waste paper mill effluent were used during the tests. It was verified that the treatment system could produce a sludge with an SVI below 140 ml/g and a high COD-reduction. It was also found that a high fraction of the COD was reduced as uptake and storage in the selector. The COD was thereafter oxidized in the aerated reactor. Full scale plants have been studied where aerobic selectors are used. The plants produce a sludge with a stable SVI below 150 ml/g. This enables a stable function
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19

Björlenius, B., and L. G. Reinius. "Use of on-line data to evaluate the activity in the biological stage at a wastewater treatment plant." Water Science and Technology 37, no. 9 (May 1, 1998): 33–40. http://dx.doi.org/10.2166/wst.1998.0337.

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Today many WWTPs are equipped with different on-line instruments for automatic and manual control of the process. The use of computerised systems for data acquisition gives us new possibilities to evaluate collected data. This study shows the possibilities and potentials in using standard equipment, simple calculations and the biological stage as a measuring cell for activity determinations. Evaluation of data from Henriksdal and Bromma WWTP give some examples from the biological stage where activity can be calculated on-line. The calculation of Oxygen Uptake Rates, OUR, can be used in several
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20

Jupsin, H., and J. L. Vasel. "Modelisation of the contribution of sediments in the treatment process case of aerated lagoons." Water Science and Technology 55, no. 11 (June 1, 2007): 21–27. http://dx.doi.org/10.2166/wst.2007.341.

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In aerated lagoons and even more in stabilization ponds the specific power (W/m3) is not high enough to maintain all the suspended solids in suspension. Some part of the suspended solids (including biomass) settles directly into the reactor and not in the final settling pond. The gradual accumulation of those sediments on the pond bottom affects performance by reducing the pond volume and shortening the Hydraulic Residence Time. However, the role played by these deposits is not restricted to such a physical effect. Far from being inert sediments they are also an important oxygen sink that must
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21

Pang, Junling, Mo Yang, Deli Tong, Xu Fu, Linli Huang, Bo Sun, and Jing Pan. "Does influent C/N ratio affect pollutant removal and greenhouse gas emission in wastewater ecological soil infiltration systems with/without intermittent aeration?" Water Science and Technology 81, no. 4 (February 15, 2020): 668–78. http://dx.doi.org/10.2166/wst.2020.141.

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Abstract Wastewater ecological soil infiltration system (WESIS) is a land treatment technology for decentralized wastewater treatment that has been applied all over the world. In this study, the pollutant removal, emission of greenhouse gases (GHGs) and functional gene abundances with different influent C/N ratios were evaluated in WESISs with/without intermittent aeration. Intermittent aeration and influent C/N ratio affect pollutant removal and GHG emission. Increased influent C/N ratio led to high total nitrogen (TN) removal, low CH4 and N2O emission in the aerated WESIS, which was differen
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22

Akca, L., and A. Samsunlu. "Performance evaluation of small treatment systems in Turkey." Water Science and Technology 41, no. 1 (January 1, 2000): 49–52. http://dx.doi.org/10.2166/wst.2000.0008.

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In accordance with the development of tourism, sea pollution has become the major problem of the coastal zones. In order to realize sustainable touristic activities in Turkey, it is very important to treat wastewater and preserve the environmental quality. It is roughly estimated that there are around 2000 small treatment plants in Turkey. However, it is necessary to construct 10,000 more wastewater treatment plants to solve the wastewater problems in small settlements. In this study, performances of small treatment systems were investigated. Two types of the treatment plants were of concern.
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23

Arias, C. A., D. V. Oirschot, R. Kilian, A. Pascual, P. Carvalho, T. Lv, Y. Zhang, H. Brix, and J. A. Alvarez. "Design and performance evaluation of a highly loaded aerated treatment wetland managing effluents from a food processing industry in Denmark." Water Practice and Technology 10, no. 4 (December 1, 2015): 644–51. http://dx.doi.org/10.2166/wpt.2015.074.

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Treating highly loaded industrial effluents are challenging when treatment wetlands (TWs) are the choice selected for treatment. If TWs are selected as the solution, passive systems demand relatively large areas and may generate operational limitations and are not flexible in case of new treatment demands since no process adjustments can be made once the system is built. New types of intensified TW, such as aerated systems, have opened new possibilities in the field of the Wetland Technology and have shown capacity to treat several types of wastewater (WW). Aerated wetlands have been built acr
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24

Albertson, O. E., and H. D. Stensel. "Aerated Anoxic Biological NdeN Process." Water Science and Technology 29, no. 7 (April 1, 1994): 167–76. http://dx.doi.org/10.2166/wst.1994.0334.

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The conventional practice for an anoxic denitrification basin has been to minimize oxygen input on the basis that it is detrimental to the process. For existing secondary treatment systems, allotting 25-35% of the aeration volume for an unaerated anoxic zone will significantly reduce plant capacity. Further, one group has held that bulking control is best achieved by eliminating all forms of oxygen from the initial contact or biological selector zones. The Phoenix 91st Avenue WWTP was designed with nitrate recycle to aerated selector zones and the anoxic zones were provided with a dense array
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25

Park, H. D., J. M. Regan, and D. R. Noguera. "Molecular analysis of ammonia-oxidizing bacterial populations in aerated-anoxic Orbal processes." Water Science and Technology 46, no. 1-2 (July 1, 2002): 273–80. http://dx.doi.org/10.2166/wst.2002.0489.

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Aerated-anoxic processes operate under the principle that small additions of oxygen to an anoxic reactor induce simultaneous nitrification and denitrification. In these systems, ammonia oxidation in the anoxic zone can easily account for 30–50% of the total nitrification in the reactor, even though the dissolved oxygen concentration is usually below detection limit. To investigate whether the nitrification efficiency in aerated-anoxic processes was due to the presence of specialized ammonia-oxidizing bacteria (AOB), an analysis of the AOB population in an aerated-anoxic Orbal process and a con
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26

Schlegel, S., and H. Koeser. "Wastewater treatment with submerged fixed bed biofilm reactor systems – design rules, operating experiences and ongoing developments." Water Science and Technology 55, no. 8-9 (April 1, 2007): 83–89. http://dx.doi.org/10.2166/wst.2007.245.

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Wastewater treatment systems using bio-films that grow attached to a support media are an alternative to the widely used suspended growth activated sludge process. Different fixed growth biofilm reactors are commercially used for the treatment of municipal as well as industrial wastewater. In this paper a fairly new fixed growth biofilm system, the submerged fixed bed biofilm reactor (SFBBR), is discussed. SFBBRs are based on aerated submerged fixed open structured plastic media for the support of the biofilm. They are generally operated without sludge recirculation in order to avoid clogging
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27

Pascual, A., D. de la Varga, C. A. Arias, D. Van Oirschot, R. Kilian, J. A. Álvarez, and M. Soto. "Hydrolytic anaerobic reactor and aerated constructed wetland systems for municipal wastewater treatment – HIGHWET project." Environmental Technology 38, no. 2 (May 31, 2016): 209–19. http://dx.doi.org/10.1080/09593330.2016.1188995.

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28

Stumpf, D., H. Zhu, B. Heinzmann, and M. Kraume. "Phosphorus recovery in aerated systems by MAP precipitation: optimizing operational conditions." Water Science and Technology 58, no. 10 (November 1, 2008): 1977–83. http://dx.doi.org/10.2166/wst.2008.549.

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An attractive way of recovering essential phosphorus from digested sludge of a WWTP is the precipitation in the sludge directly, as part of the continuous treatment process. For optimizing the precipitation, 1 litre-batch tests were performed in a model system to examine the MAP-crystallization kinetics. Different parameters such as e.g. the aeration flow rate were investigated. The aim was to find an optimized setting for a pilot reactor for the continuous production of MAP. This reactor performed as an airlift reactor for an improved mixing and stripping the dissolved CO2 and separating the
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29

Siegrist, H., and W. Gujer. "Nitrogen removal in activated sludge systems including denitrification in secondary clarifiers." Water Science and Technology 30, no. 6 (September 1, 1994): 101–11. http://dx.doi.org/10.2166/wst.1994.0257.

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Denitrification in the secondary clarifier can contribute substantially to the nitrogen removal of activated sludge systems. This is illustrated on two treatment plants with different secondary clarifier systems. A model to estimate denitrification capacity and to design activated sludge systems for nitrogen removal is developed and verified with data from two treatment plants. The model includes denitrification in the secondary clarifier, wastewater composition (soluble readily biodegradable COD, particulate degradable COD), oxygen input into the anoxic volume, temperature, and solids retenti
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30

Ozimek, Teresa, Wojciech Dąbrowski, and Maria Florkiewicz. "Duckweed does not improve the efficiency of municipal wastewater treatment in lemna system plants / Rzęsa nie poprawia efektywności oczyszczania ścieków komunalnych w oczyszczalniach typu Lemna System." Archives of Environmental Protection 41, no. 3 (September 1, 2015): 47–52. http://dx.doi.org/10.1515/aep-2015-0029.

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Abstract This study investigated the operation of three full-scale Lemna System surface fl ow municipal wastewater treatment plants, built according to the Lemna Corporation design. These plants consist of two ponds, the first aerated and the second for duckweed, with a barrier grid in the latter to ensure uniform plant distribution across its area. According to designers duckweed improves the efficiency of wastewater treatment. The three treatment plants are situated in central Poland and they differ in the occurrence of duckweed, two of them, located in Raków and Bąkowiec, operate without du
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31

Banerji, Shankha K., and Kye-Min Cho. "Evaluation of a Small-Scale Biofilm Process for Wastewater Treatment." Water Quality Research Journal 26, no. 1 (February 1, 1991): 87–100. http://dx.doi.org/10.2166/wqrj.1991.006.

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Abstract An innovative aerated biofilm process (ABP) was evaluated under laboratory conditions to treat synthetic wastewater. The particular system performed well (>90% BOD removal) at fairly high BOD loading conditions (16.7 g BOD m−2d−1). The process did not require a separate secondary settling chamber to produce an effluent low in suspended solids (<10 mgL−1). The amount of sludge produced was lower than other comparable systems — 0.3g total solids were produced per g of BOD removed at an organic removal rate of 8 g BOD m−2d−1. This process could be adopted for treating waste
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32

Rantala, P., and P. Väänänen. "Cost Comparison of Aerobic and Anaerobic Wastewater Treatment Systems." Water Science and Technology 17, no. 1 (January 1, 1985): 255. http://dx.doi.org/10.2166/wst.1985.0020.

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The costs of different types of aerobic, anaerobic and combined wastewater treatment systems are compared in this study. The assumed BOD or COD-loads from typical forest industry processes form the basis of comparison. General cost curves for various waste treatment processes and some case examples are also presented. In the calculations it is assumed that the wastewater is treated to the same effluent quality by using activated sludge, modified activated sludge and combination of anaerobic-aerobic treatment process. In anaerobic-aerobic systems different types of combinations are analyzed. In
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33

Nunes, Jackeline Valendolf, Mac Wendell Barbosa da Silva, Gustavo Henrique Couto, Eduarda Roberta Bordin, Wanessa Algarte Ramdsdorf, Izadora Cervelin Flôr, Vânia Aparecida Vicente, José Daniel de Almeida, Fernanda Celinski, and Claudia Regina Xavier. "Microbiological diversity in an aerated lagoon treating kraft effluent." BioResources 16, no. 3 (June 1, 2021): 5203–19. http://dx.doi.org/10.15376/biores.16.3.5203-5219.

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The microbiological diversity of cultivable bacteria was analyzed in an aerated facultative lagoon. The removal of specific compounds and measures of pollutant load was evaluated with isolated native bacteria, selected and identified in kraft cellulose effluent. The system was operated with an organic loading rate of 0.2 kgCODm-3d-1 for 60 days. Analyses of the fluorescence excitation-emission matrix, acute ecotoxicity, and microbiology were performed. Bioaugmentation tests were done to emphasize the removal of color, using promising species. The removals of biochemical oxygen demand, chemical
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34

Peitz, Camila, and Claudia Regina Xavier. "Evaluation of aerated lagoon modified with spongy support medium treating Kraft pulp mill effluent." Revista Facultad de Ingeniería Universidad de Antioquia, no. 92 (June 7, 2019): 60–69. http://dx.doi.org/10.17533/udea.redin.20190725.

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The pulp industry generates high effluent flows, which contain high chemical oxygen demand (COD), biochemical oxygen demand (BOD5), colour and ecotoxicity. This study aimed to evaluate the treatment of Kraft pulp effluent by aerated lagoon modified with sponge support media (APG). It was assessed the arrangement of the support media in the aerated lagoons in the organic load rate (OLR) of 0.2 kgCOD m-3 d-1, and after that, with OLR variation from 0.2 to 1.2 kgCOD m-3 d-1. The parameters evaluated were BOD5, COD, colour, lignin derivatives, total phenolic compounds and acute ecotoxicity in D. m
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35

Struve, D. K. "Seed conditioning of red oak: a recalcitrant North American seed." Scientia Agricola 55, spe (1998): 67–73. http://dx.doi.org/10.1590/s0103-90161998000500012.

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A ten day aerated water soak was developed as a seed conditioning treatment for red oak (Quercus rubra L.). Conditioned seeds had higher germination completeness, uniformity and speed compared to control seeds. Seeds could be conditioned under a wide range of temperatures and durations. Conditioned seeds were maintained at 7(0)C for 30 days without loss of seed quality. During conditioning, pericarps split in response to seed hydration. Split pericarps could be used as a pre-sowing indicator for high quality seeds. Seed conditioning was ineffective on dormant seeds. Increased crop uniformity a
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36

d'Antonio, Giuseppe, Luigi Mendia, Francesco Pirozzi, and Arturo Polese. "Rotating biological contactor-solid contact system for the treatment of wastewater from small communities." Water Science and Technology 35, no. 6 (March 1, 1997): 109–18. http://dx.doi.org/10.2166/wst.1997.0249.

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In Rotating Biological Contactor (RBC) WasteWater Treatment Plants (WWTP) the fixed film unit effluent quality can be improved by means of a biological refinement system, consisting of an aerated Solid Contact (SC) unit. This process, known as an RBC/SC system, is an alternative to other tertiary treatment systems and can be used with good results in the new WWTPs of small communities and in upgrading existing RBC plants whose effluents no longer respect the established standards. The results of an experimental study on an RBC/SC dual biological system fed with clarified municipal sewage are p
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37

Chin, Kee Kean, and Say Leong Ong. "Treatment and reuse of water for prawn cultivation." Water Science and Technology 30, no. 9 (November 1, 1994): 255–58. http://dx.doi.org/10.2166/wst.1994.0492.

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An experimental prawn pond of 600 sq m surface area and 2 m depth was used for the cultivation of tiger prawn. Thirty-thousand 14-day PL flies were stocked. Water treatment systems consisting of primary sedimentation, aerated biofilter and inclined plate final sedimentation were installed for treatment and recycling of the pond water. With complete recycling and reuse of the pond water and occasional replenishing with seawater to make up for losses due to evaporation, water quality was maintained at an acceptable level. Survival rate of the prawn was above 80 %. Prawn yield was estimated to be
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38

M. T. M. Oliveira, Leonardo, José L. S. Duarte, Vanderson B. Bernardo, Andreza Porto Moura, Aureo Alves de S. Neto, Eduardo J. S. Fonseca, and Laís F. A. M. Oliveira. "Numerical study of the filtering barriers influence to contain aerated particulate systems." International Journal of Scientific Research and Management 10, no. 12 (December 13, 2022): 28–45. http://dx.doi.org/10.18535/ijsrm/v10i12.m01.

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Since the high rate of viral proliferation caused by Covid-19, it was observed that microdroplets with a pathogenic load can remain floating when in confined environments due to their low densities. They are also subject to being transported very easily when in open environments, becoming potential agents of infection. It has motivated several researchers in the field of particulate systems to try understand how particles behave in more extreme conditions. Bearing in mind that the materials currently used have a low retention yield for liquid droplets, and that protection barriers against path
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39

Carlsson, Bengt, and Jesús Zambrano. "Fault detection and isolation of sensors in aeration control systems." Water Science and Technology 73, no. 3 (October 20, 2015): 648–53. http://dx.doi.org/10.2166/wst.2015.529.

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In this paper, we consider the problem of fault detection (FD) and isolation in the aeration system of an activated sludge process. For this study, the dissolved oxygen in each aerated zone is assumed to be controlled automatically. As the basis for an FD method we use the ratio of air flow rates into different zones. The method is evaluated in two scenarios: using the Benchmark Simulation Model no. 1 (BSM1) by Monte Carlo simulations and using data from a wastewater treatment plant. The FD method shows good results for a correct and early FD and isolation.
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40

Andersson, B. "Tentative Nitrogen Removal with Fixed Bed Processes in Malmö Sewage Treatment Plant." Water Science and Technology 22, no. 1-2 (January 1, 1990): 239–50. http://dx.doi.org/10.2166/wst.1990.0150.

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A test program for the use of fixed bed processes in systems for nitrogen removal at an advanced sewage treatment plant is described. Results from studies on nitrification in a full scale trickling filter plant with different filter depths and at different wastewater temperatures are presented. Results from full scale experiments with denitrification/nitrification in a retrofitted activated sludge plant are also presented. The effect of an aerated submerged fixed bed in the aeration basin on nitrification was investigated. Observations of the biofilm formed on the fixed bed were made in micros
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41

Jobbágy, A., B. Literáthy, and G. Tardy. "Implementation of glycogen accumulating bacteria in treating nutrient-deficient wastewater." Water Science and Technology 46, no. 1-2 (July 1, 2002): 185–90. http://dx.doi.org/10.2166/wst.2002.0475.

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Activated sludge treatment of nutrient-deficient wastes may lead to severe slime formation and consequent biomass separation difficulties. The purpose of this paper has been to show that bioreactor arrangement essentially influences the manner of biological excess carbon removal. In a comparative lab-scale experiment two differently arranged activated sludge systems were operated simultaneously: an aerated CSTR with an aerobic selector and an aerated CSTR with an anaerobic selector. The seed derived from an anaerobic/aerobic activated sludge plant of a winery. The model wastewater contained wi
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42

Roeder, Eberhard, and William G. Brookman. "Comparison of Multiple Grab and 24-hour Time-composite Samples from Aerated Onsite Sewage Treatment Systems." Proceedings of the Water Environment Federation 2008, no. 16 (January 1, 2008): 1452–60. http://dx.doi.org/10.2175/193864708788734999.

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43

Larsen, Penny, and Jim Sizemore. "FULLY INTEGRATING VENDOR PACKAGE SYSTEMS WITH PLANT-WIDE SCADA SYSTEMS AT MUNICIPAL WASTEWATER TREATMENT FACILITIES." Proceedings of the Water Environment Federation 2007, no. 12 (January 1, 2007): 6316–25. http://dx.doi.org/10.2175/193864707787969991.

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44

Oliveira, S. C., and M. von Sperling. "Performance evaluation of UASB reactor systems with and without post-treatment." Water Science and Technology 59, no. 7 (April 1, 2009): 1299–306. http://dx.doi.org/10.2166/wst.2009.138.

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This article evaluates and compares the actual behavior of 18 UASB reactor systems operating without (10 plants) and with (8 plants) post treatment, considering their performance and their reliability in terms of compliance with specified discharge standards. The following types of post-treatment processes were analyzed: aerated filter; anaerobic filter; trickling filter; dissolved air flotation unit; facultative pond and maturation pond. The effluent quality and the removal efficiencies were compared with typical values reported in the technical literature. A methodology developed by Niku et
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45

Ray, Rajan, Paul Henshaw, and Nihar Biswas. "Effects of reduced aeration in a biological aerated filter." Canadian Journal of Civil Engineering 39, no. 4 (April 2012): 432–38. http://dx.doi.org/10.1139/l2012-022.

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Aeration is a major part of the operating cost in biological aerated filtration (BAF) systems for wastewater treatment. This study investigated the effect of reducing aeration at the City of Windsor’s Lou Romano Water Reclamation Plant to find the lowest possible airflow rate while maintaining a satisfactory ammonia and biological oxygen demand (BOD) in the BAF effluent. Profiles of temperature, dissolved oxygen, pH, BOD, ammonia and nitrate concentration were measured along the height of cell No. 7 at the plant, at different time intervals during filtration, at airflow rates varying from 1300
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46

Meister, Michael, and Wolfgang Rauch. "Modelling aerated flows with smoothed particle hydrodynamics." Journal of Hydroinformatics 17, no. 4 (March 9, 2015): 493–504. http://dx.doi.org/10.2166/hydro.2015.132.

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Modelling aerated flows is a complex application of computational fluid dynamics (CFD) since the interfaces between air and water change rapidly. In this work, the simulation of aerated flows with the smoothed particle hydrodynamics (SPH) method is investigated with a focus towards the application in engineering practice. To prove the accuracy of the method, the processes of air entrainment and rising air bubbles are studied. Through monitoring the evolution of the bubble contours it is shown that the novel approach of adding artificial repulsion forces at the interface does not alter the dyna
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47

Slade, A. H., C. M. Nicol, and J. Grigsby. "Nutrients Within Integrated Bleached Kraft Mills: Sources and Behaviour in Aerated Stabilisation Basins." Water Science and Technology 40, no. 11-12 (December 1, 1999): 77–84. http://dx.doi.org/10.2166/wst.1999.0697.

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As constraints on the discharge of nitrogen and phosphorus from the pulp and paper industry become tighter, a thorough knowledge of nutrient sources, and their behaviour through treatment systems, is required. Once nutrient behaviour has been characterised, strategies to minimise discharge can be formulated. A survey of nutrient sources around a modern ECF integrated bleached kraft mill showed that point sources of nitrogen and phosphorus could be identified. Approximately 40% of the nitrogen was contained in the foul condensate stream and 40% of the phosphorus contained in the acid stage of b
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48

Meyer, U., and H. J. Pöpel. "Fuzzy-control for improved nitrogen removal and energy saving in WWT-plants with pre-denitrification." Water Science and Technology 47, no. 11 (June 1, 2003): 69–76. http://dx.doi.org/10.2166/wst.2003.0588.

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In the last few years, numerous studies were carried out, dealing with the application of fuzzy-logic to improve the control of the activated sludge process. In this paper, fuzzy-logic based control strategies for wastewater treatment plants with pre-denitrification are presented that should lead to better effluent quality and, in parallel, to a reduction of energy consumption. Extensive experimental investigations on a large scale pilot plant as well as simulation studies (ASM1 with SIMBA®) were carried out in order to design, evaluate and compare different fuzzy-controllers with each other a
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49

Godin, D., C. Bouchard, and P. A. Vanrolleghem. "Net environmental benefit: introducing a new LCA approach on wastewater treatment systems." Water Science and Technology 65, no. 9 (May 1, 2012): 1624–31. http://dx.doi.org/10.2166/wst.2012.056.

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Life cycle assessment (LCA) allows evaluating the potential environmental impacts of a product or a service in relation to its function and over its life cycle. In past LCAs applied to wastewater treatment plants (WWTPs), the system function definition has received little attention despite its great importance. This has led to some limitations in LCA results interpretation. A new methodology to perform LCA on WWTPs is proposed to avoid those limitations. It is based on net environmental benefit (NEB) evaluation and requires assessing the potential impact of releasing wastewater without and wit
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50

Abdullah, H., A. Abusam, A. Mydlarczyk, A. Al-Dhafeeri, F. Al-Ajeel, A. Ali, M. Al-Jomaa, and R. Al-Yaseen. "Performance Evaluation of Commercial Package Systems Used in Kuwait for on-Site Treatment and Reuse of Domestic Wastewater." International Journal of Environmental Science and Development 14, no. 1 (2023): 22–29. http://dx.doi.org/10.18178/ijesd.2023.14.1.1410.

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Kuwait’s wastewater management scheme consists of a huge centralized sewerage system that transports all wastewater generated for treatment at central municipal plants for wastewater treatment. However, there are a few remote sites that are still not connected to the public sewerage system. In such sites, on-site systems such as conventional septic tank or package systems are commonly used. This study assessed the performance of two package systems used in Kuwait for on-site wastewater treatment and reuse. Wastewater samples were collected weekly for five months from influent and effluent stre
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