Academic literature on the topic 'Reactive black WNN dye'

Nesta dissertação foi estudada a zeólita sintetizada a partir de cinzas leves de carvão como um potencial adsorvente para a remoção de corante reativo preto 5 (RP5). Ensaios cinéticos e de equilíbrio foram realizados visando obter-se as melhores condições para a adsorção deste corante, e verificou-se a influência dos seguintes parâmetros: efeito do tempo de contato, concentração inicial do corante, dose do adsorvente, pH da solução aquosa, adição dos sais NaCl e Na2SO4 e temperatura. O tempo de equilíbrio foi alcançado após 420 min. Os dados de adsorção foram ajustados melhor ao modelo cinético de pseudo-segunda-ordem. Para o sistema corante/adsorvente foi aplicado o modelo de isoterma de adsorção de Langmuir, apresentando capacidade de adsorção máxima de 0,685 mg g-1. Os dados experimentais mostraram uma alta porcentagem de remoção de 47,7 a 88,1% de RP5 sobre a zeólita. A alta porcentagem indicou que o material zeolítico apresenta potencial para ser usado como adsorvente na remoção de corantes azo reativo de indústrias têxteis. Os parâmetros termodinâmicos foram avaliados e demonstraram que o processo de adsorção do RP5 sobre a zeólita é espontâneo e exotérmico. Os experimentos adicionando os sais foram realizados para uma melhor simulação das condições reais do efluente. Os resultados mostraram que o equilíbrio de adsorção do RP5 sobre a zeólita na presença de sais foram alcançados em um tempo menor e que quanto maior a concentração dos sais na solução, maior a capacidade de adsorção. O resultado obtido na avaliação da toxicidade pelo microcrustáceo Daphnia similis, o tratamento de adsorção com zeólita se mostrou extremamente favorável5 reduzindo a carga tóxica e cor do efluente aquoso.<br>In this dissertation was studied the zeolite synthesized from coal fly ash as a potential adsorbent for the removal of reactive Black 5 dye (RP5). Equilibrium and kinetic experiments were conducted to obtain the best conditions for the adsorption of this dye, and observed the influence of the following parameters: effect of contact time, initial dye concentration, adsorbent dose, pH of the aqueous solution, addition of NaCl and Na2SO4 and temperature. The equilibrium time was reached after 420 min. The adsorption data were fitted better by a pseudo-second-order. For the dye / adsorbent system was applied to the model of Langmuir adsorption isotherm, with maximum adsorption capacity of 0.685 mg g-1. The experimental data showed a high percentage of removal from 47.7 to 88.1% of RP5 on the zeolite. The high percentage indicates that the zeolitic material has a potential to be used as adsorbent in the removal of azo dye reactive textile industries. The thermodynamic parameters were evaluated and showed that the adsorption process of RP5 on the zeolite is spontaneous and exothermic. The experiments were performed by adding salts to better simulate actual conditions in the effluent. The results showed that the adsorption equilibrium of reactive black 5 on the zeolite in the presence of salts were achieved in a shorter time and that the higher the concentration of salts in solution, the higher the adsorption capacity. The result obtained in the evaluation of toxicity by microcrustacean Daphnia similis treatment with zeolit adsorption was extremely favorable, reducing the toxic load of waste water and color.

Submitted by Marilene Donadel (marilene.donadel@unioeste.br) on 2018-04-25T20:20:41Z No. of bitstreams: 1 Carolina_Miyashiro_2017 .pdf: 1779339 bytes, checksum: f6b6d1ffc4073370161792334748de1b (MD5)<br>Made available in DSpace on 2018-04-25T20:20:41Z (GMT). No. of bitstreams: 1 Carolina_Miyashiro_2017 .pdf: 1779339 bytes, checksum: f6b6d1ffc4073370161792334748de1b (MD5) Previous issue date: 2017-12-11<br>Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq<br>A magnetic biocoagulant (Fe3O4-MO) was produced by the association of nanoparticles of iron oxide (Fe3O4) and Moringa Oleífera Lam (MO) extract in different concentrations (0.5%, 1% and 2%), aiming to evaluate its performance in removal of the reactive dye black 5 (RP5) in aqueous medium (synthetic waste water) and real textile effluent. The MO protein was extracted with saline solution and the nanoparticles were synthesized by the coprecipitation method. The biocoagulant was characterized by X-ray diffractometry (XRD), vibration magnetometry, Fourier Infrared Transformer (FTIR) spectroscopy, scanning electron microscopy with X-ray energy dispersion spectroscopy (SEM / EDS) and transmission electron microscopy (MET). For the coagulation / flocculation / sedimentation process (C/F/S), the operational parameters studied were sedimentation time, biocoagulant concentration and pH. The efficiency of the C/F/S process was determined by the analysis of the apparent color, absorbance, zeta potential and total organic carbon (TOC). After determining the best conditions (concentration of 0.5% MO, dosage of 100 mg L-1 and pH 7) of the C/F/S process, sedimentation kinetic studies for synthetic wastewater (ARS), real effluent (ERT), both with and without magnetic field and the sludge recovered and regenerated with the saline extract of MO (with magnetic field). At the 100 mgL-1 dosage of magnetic biocoagulant at a concentration of 0.5% MO saline, 89% apparent color removals were obtained in the time of 20 min. The C / F / S process shows dependence on the pH of the reaction medium, because at pH 7 color removal values of 83% and 84% were obtained in reaction time 20 and 40 min, respectively.<br>Um biocoagulante (Fe3O4-MO) magnético foi produzido pela associação de nanopartículas de óxido ferro (Fe3O4) e extrato de Moringa Oleífera Lam (MO) em diferentes concentrações (0,5%, 1% e 2%), para avaliar sua performance na remoção do corante reativo preto 5 (RP5) em meio aquoso (água residuária sintética) e efluente real têxtil. A proteína da MO foi extraída com solução salina e as nanopartículas foram sintetizadas pelo método de coprecipitação. O biocoagulante foi caracterizado por difratometria de raio-X (DRX), magnetometria vibratória, spectroscopia por transformada de Fourier (FTIR), microscopia eletrônica de varredura com espectroscopia por dispersão de energia de Raios-X (MEV/EDS) e microscopia eletrônica de transmissão (MET). Para o processo de coagulação/floculação/sedimentação (C/F/S) os parâmetros operacionais estudados foram tempo de sedimentação, concentração do biocoagulante e pH. A eficiência do processo C/F/S foi determinada pela análise da cor aparente, absorbância, potencial zeta e carbono orgânico total (COT). Após determinar as melhores condições (concentração de MO 0,5%, dosagem de biocoagulante 100 mg L-1 e pH 7) do processo C/F/S, foram realizados estudos cinéticos de sedimentação para água residuária sintética (ARS), efluente real têxtil (ERT), ambos com e sem campo magnético e o lodo recuperado e regenerado com o extrato salino de MO (com campo magnético). Na dosagem 100 mgL-1 de biocoagulante magnético em concentração de 0,5% de solução salina de MO foram obtidos remoções de cor aparente 82% no tempo de 20 min. O processo C/F/S apresenta dependencia em relação ao pH do meio reacional, pois em pH 7 foram obtidos valores de remoção de cor de 83 % e 84 % em tempo de sedimentação 20 e 40 min., respectivamente. Demonstrando-se um materialpromissor na remoção de RP5 e no tratamento de ERT pois possui alta eficiência, preparo simples e condizentes com questões ambientais.

A problemática envolvendo os efluentes têxteis decorre principalmente da elevada coloração que apresentam, devido à presença de corantes que além de serem quimicamente estáveis, podem ser tóxicos e/ou carcinogênicos. Logo, quando são descartados in natura no meio ambiente causam problemas estéticos e, sobretudo, ambientais mesmo em baixas concentrações, além da possibilidade de serem nocivos à saúde humana e dos animais. Neste contexto, o objetivo deste trabalho foi estudar a degradação eletroquímica de dois corantes têxteis, Reativo Azul 19 (RA-19) e o Reativo Preto 5 (RP-5) via Oxidação Anódica (OA), utilizando ânodos de Diamante Dopado com Boro (DDB) suportados em titânio ou em nióbio, via processo Eletro-Fenton (EF) e pela combinação dos processos com H2O2 eletrogerado e OA (CP), usando um eletrodo de Carbono Vítreo Reticulado (CVR) como cátodo. As degradações foram realizadas em célula eletroquímica de um compartimento e em reator de fluxo do tipo filtro-prensa com dois compartimentos. A eficiência das degradações foi monitorada pelas técnicas de espectrofotometria no UV-VIS, Cromatografia Líquida de Alta Eficiência (CLAE) e análise do teor de Carbono Orgânico Total (COT). As variáveis estudadas foram densidade de corrente (10-100 mA cm-2 em célula e 4-41 mA cm-2 em reator), dopagem do eletrodo de DDB/Ti (5.000 e 15.000 ppm B/C), concentração inicial dos íons Fe2+ (0-0,10 mmol L-1) e dos corantes (10-250 mg L-1). As degradações dos corantes apresentaram uma cinética de pseudo ordem zero; exceto quando o corante RP-5 foi degradado pelo processo EF, sendo o melhor ajuste ao modelo de pseudo primeira ordem. Além disso, em iguais condições eletroquímicas o corante RP-5 foi degradado em menor tempo em relação ao RA-19; sendo que em todos os processos estudados os corantes foram totalmente removidos. Considerando a OA em célula com os eletrodos de DDB/Ti, a degradação foi positivamente influenciada pelo aumento da densidade de corrente e dopagem do eletrodo, especialmente em relação a cinética. Além disso, os corantes RA-19 e RP-5 foram completamente removidos em 35 e 50 min de eletrólise quando 100 mA cm-2 foi aplicada ao eletrodo de DDB/Ti dopado com 15.000 ppm relação B/C. Em 2 h, 37% em mineralização foi observado para ambos os corantes e a toxicidade do RA-19 diminuiu contra as bactérias Vibrio fischeri. Ainda nessa condição total mineralização foi alcançada após 8 h de degradação. A remoção de COT foi favorecida utilizando o reator contendo os eletrodos de DDB/Nb e CVR ao invés da célula eletroquímica, chegando a percentuais de 84 e 82% em 30 e 90 min para os corantes RA-19 e RP-5 que foram removidos em 7,5 e 5 min, respectivamente, quando a densidade de 41 mA cm-2 foi aplicada ao DDB/Nb durante a degradação via exclusivamente OA. Entre os processos realizados no reator, o EF foi o energeticamente mais favorável, promovendo remoção em COT de 60 e 74% para os corantes RA-19 e RP-5 com consumo energético de 204 e 208 kWh kg-1, além disso, a completa remoção dos corantes ocorreu em 15 e 7,5 min, respectivamente, quando o eletrólito continha íons Fe2+ na concentração de 0,10 mmol L-1 e aplicando-se -0,4 V vs Ag/AgCl ao eletrodo de CVR. Na degradação os corantes via CP o RA-19 e RP-5 foram completamente removidos em 30 e 15 min com mineralização de 72 e 82% em 90 min associada a consumos energéticos de 562 e 745 kWh kg-1, respectivamente, quando 41 mA cm-2 foi aplicada ao DDB/Nb. Por fim, concluiu-se que os resultados das degradações dos corantes foram promissores, já que rápida remoção dos corantes foi observada, além da parcial mineralização. Logo os processos propostos podem ser aplicados na remoção dos corantes em água; sendo necessários realizar mais estudos, principalmente em relação ao material eletródico e configuração do sistema eletroquímico visando a aplicação industrial.<br>The main problem involving the textile wastewater is theirs high coloration since they present dyes, which are chemically stable and can be toxic and/or carcinogenic. Therefore, when the textile wastewater are discarded in nature in the environment, even in low concentrations, they may cause not only aesthetic and environmental problems, but also can be harmful to human and animal health. In this context, the aim of the study was to evaluate the electrochemical degradation of two textile dyes, Reactive Blue 19 (RB-19) and Black 5 (RB-5) via Anodic Oxidation (AO) using as anodes Boron Doped Diamond electrodes (BDD) supported on titanium or niobium, via Electro-Fenton (EF) process and by combination of processes with electrogenerated H2O2 and AO (CP) using a Reticulated Vitreous Carbon electrode (RVC) as cathode. The degradations assays were carried out in an electrochemical cell with one compartment and in a filter-press flow reactor with two compartments. The efficiency of degradation was monitored by UV-VIS spectrophotometry, High Performance Liquid Chromatography (HPLC) and analysis of Total Organic Carbon (TOC). The variables studied were current density (10-100 mA cm-2 for cell and 4-41 mA cm-2 for reactor), doping of the BDD/Ti electrodes (5,000 e 15,000 ppm B/C), initial concentration of the Fe2+ ions (0-0,10 mmol L-1) and dyes (10-250 mg L-1). The kinetic results showed that the removal of dyes followed the model of pseudo zero order; except when the RB-5 dye was degraded by EF process, which the best fitted was to pseudo first order model. Furthermore, for equal conditions the RB-5 was degraded in less time in comparison to the RB-19. In addition, the dyes were fully removed in all the processes studied. Regarding the AO in cell with BDD/Ti, the degradation was positively influenced by the increasing in current density and doping of the electrode, primarily the kinetics parameters. In addition, total removal of RB-19 and RB-5 was achieved in 35 and 50 min of electrolysis when 100 mA cm-2 was applied to the electrode doped with 15,000 ppm ratio B/C. In 2 h, 37% in mineralization was attained for both dyes and the toxicity effect of the RB-19 decreased against the bacteria Vibrio fischeri. In this condition, total TOC removed was also reached after 8 h. The TOC removal was enhanced using the reactor fitted with BDD/Nb and RVC instead of the electrochemical cell, achieving TOC removal of 84 and 82% in 30 and 90 min for RB-19 and RB-5 which were removed in 7.5 and 5 min, respectively, when 41 mA cm-2 was applied to the BDD/Nb in the degradation exclusively via AO. Among the processes carried out in the reactor, the EF was the energetically most favourable since TOC removal of 60 and 74% for RB-19 and RB-5 with energy consumption of 204 and 208 kWh kg-1 were noted. In addition, the RB-19 and RB-5 were completely removed in 15 and 7.5 min, respectively, when the electrolyte containing 0.10 mmol L-1 of Fe2+ ions and -0.4 V vs Ag/AgCl was applied to CVR electrode. The combination of processes with electrogenerated H2O2 and AO for degradation of the dyes removed the RB-19 and RB-5 in 30 and 15 min with mineralization of 71.6 and 81.8% in 90 min associated to energy consumptions of 562 and 745 kWh kg-1 respectively, when 41 mA cm-2 was applied to BDD/Nb. Therefore, the degradation results of the dyes were promised since quickly removal of the dyes and partial mineralization were observed hence the proposed processes could be used to remove the dyes from water. However, more studies are needed to enable an industrial application, especially regarding the electrode material and configuration of the electrochemical system.

Made available in DSpace on 2017-07-10T18:07:59Z (GMT). No. of bitstreams: 1 Pedro Y Ramos Suzaki.pdf: 2257740 bytes, checksum: e20921bc0a6b2dbdb9498b56275a75cc (MD5) Previous issue date: 2013-02-20<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work aimed to study the removal of dye Reactive Black 5 using as biosorbent macrophyte Limnobium spongia. It was investigated the influence of milling the biomass, the particle size, the chemical pretreatment adsorbent with the solution of NaOH 0.1 mol L¬-1 and H2SO4 0.1 mol L-1 , the stirring speed and also the influence of temperature and pH parameters. It was also determined adsorption kinetics and equilibrium. In the study of the influence of grinding, it was observed that the biomass of ground Limnobium spongia showed better results in the adsorption of the dye than the entire biomass. The different particle sizes and pretreatment of biomass tested did not influence significantly the removal of the dye. In the study stirring rate was observed that from 100 rpm external diffusional resistances are reduced to a minimum. The parameters pH and temperature were studied jointly by the method Central Composite Rotatable Design (CCRD), behavior demonstrated that these parameters are independent and greater amount of dye removed occurred at the maximum temperature 49.8°C and at pH 0.8. The kinetic study was made at temperatures of 20 and 50° C, the maximum amount of dye removed and the equilibrium time was of 81.97 mg g-1 and 6 h to 20°C and 105.6 mg g-1 and 4 h to 50°C. The kinetic data were best represented by pseudo-second order model. The equilibrium isotherms were performed at temperatures of 20, 30, 40 and 50º C. The highest removal of dye was 108.17 mg g-1 at 50°C and amount removed was 86 mg g-1 at 20°C. The equilibrium data of isotherms at all temperatures were predicted by the Langmuir model.<br>Este trabalho teve como objetivo estudar a remoção do corante Preto Reativo 5 utilizando como biossorvente a macrófita Limnobium spongia. No estudo da biossorção do corante, foram investigadas a influência da moagem da biomassa, o tamanho da partícula, o pré-tratamento químico do adsorvente com soluções de NaOH 0,1 mol L¬-1 e H2SO4 0,1 mol L¬-1, a velocidade de agitação e também a influência dos parâmetros temperatura e pH. Foram determinadas a cinética de adsorção e o equilíbrio. No estudo da influência da moagem, observou-se que a biomassa de Limnobium spongia moída obteve melhores resultados na adsorção do corante do que a biomassa inteira. As diferentes granulometrias e pré-tratamentos da biomassa testadas não influenciaram de forma significativa na remoção do corante. No estudo da velocidade de agitação observou-se que a partir de 100 rpm as resistências difusionais externas foram reduzidas ao seu valor mínimo. Os parâmetros pH e temperatura foram estudados de forma conjunta através do método de Delineamento Composto Central Rotacional (DCCR) e o resultado demonstrou que estes parâmetros são independentes e que a maior quantidade de corante removida aconteceu na temperatura máxima testada 49,8ºC e no pH 0,8 (mínimo testado). O estudo cinético foi realizado nas temperaturas de 20 e 50ºC, a quantidade máxima de corante removido e o tempo de equilíbrio foram de 81,97 mg g-1¬¬ e 6 h para 20º e 105,6 mg g-1¬¬ e 4 h para 50ºC. Os dados cinéticos foram melhor representados pelo modelo cinético de pseudo-segunda ordem. As isotermas de equilíbrio foram avaliadas nas temperaturas de 20, 30, 40 e 50ºC. O maior valor de remoção de corante foi de 108,2 mg g-1 na isoterma de 50ºC, enquanto que a quantidade máxima removida foi de 86 mg g-1 na isoterma de 20ºC. Os dados de equilíbrio das isotermas apresentaram comportamento previsto pelo modelo de Langmuir.

碩士<br>義守大學<br>土木與生態工程學系碩士班<br>99<br>Reactive black B (RBB) is a group of azo dyes that are widely used in textile industry. Due to its high production and application figures, RBB is commonly found in wastewater, activated sludge, and aqueous environments. In this study, we isolated a RBB degradable strain from river sediment. The strain was identified with their 16S rRNA as Bacillus cereus. We constructed the optimal condition of RBB decolorization by using various incubation factors such as temperature, initial pH, surfactants, additional carbon and nitrogen sources. The optimal conditions of RBB decolorization for Bacillus cereus are: static culture, 25 ℃, pH 8, 1 CMC of triton X-100 and added yeast extract 0.15g, glucose 0.125g. In the end, we also determined the toxicity of RBB by green algae Chlorella Vulgaris. The results showed that the median effective concentration (EC50) of RBB for B. cereus is 48 mg L-1 and toxicity will really decrease after decolorization. Based on this work, we hope that these findings could provide some useful information for applying the biodecolorization of RBB in our environment.

碩士<br>國立臺灣大學<br>環境工程學研究所<br>91<br>High-gravity rotating packed bed (HGRPB) gas-liquid contactor is characterized by its high mass transfer efficiency, small spatial requirement, low energy consumption, and low capital and operating costs. This technology can be applied to the processes of distillation, absorption, gas stripping, and diffusion-controlled gas-liquid reaction. The present study focuses mainly on the characteristics of the gas-liquid mass transfer and ozonation of reactive dye of Reactive Black 5 (RB5) in the HGRPB. Four parts of experiments are conducted in this study. Oxygen transfer into water using HGRPB (system A, with bed volume VB of 0.000335 m3) with continuous operation is investigated in the first part. The effects of various operation parameters upon the oxygen mass transfer coefficient ( ) are examined, including rotating speed (N), liquid flow rate (QL), and gas flow rate (QG). The oxygen mass transfer coefficients of HGRPB ( ) of 0.056 — 0.145 s-1 are larger than those of the conventional packed bed ( ) of 0.0004 — 0.07 s-1. The conditions of the experiments of this part are: QL of 0.52 — 1.29 L/min, QG of 1.19 — 4.40 L/min, and N of 400 — 1500 rpm. The liquid holdups (εL) of HGRPB (system B, with VB of 0.000185 m3) affected by various operation parameters are studied for the continuous system in the second part. The results indicate that εL is proportional to N, superficial gas velocity (uG,1), and superficial liquid velocity (uL,2) with powers of -0.148, -0.015, and 0.646, respectively. Thus, εL is strongly effected by uL,2. The experimental conditions of this part are: QL = 0.15 — 1.29 L/min, QG = 1.19 — 4.40 L/min, N = 300 — 1500 rpm。 The mass transfer of ozone into water using HGRPB (system B) are examined in the third part. For semi-batch operation with recycled liquid, the dissolved liquid ozone concentration (θALb) increases with time and approaches to a steady state value at a certain time tss which decreases with increasing values of N and QL. The mass transfer coefficients of ozone and oxygen are further determined in continuous HGRPB (system B) by simulation. The results show that the ratio of the mass transfer coefficients of ozone and oxygen ( / = 0.0975 s-1/0.111 s-1 = 0.88) with high liquid flow rate (QL = 0.60 L/min) and rotating speed (N = 1500 rpm) is closed to the ratio of the square roots of diffusivities ((DA/ DO)0.5 = (2.0×10-9 m2/s)/(2.5×10-9 m2/s))0.5 = 0.8944) calculated by the penetration theory. This means that the penetration theory is more applicable to HGRPB than the film theory. The results also show that the of 0.0975 s-1 with higher QL of 0.60 L/min, and N of 1500 rpm, is about 4.31 times of of 0.0226 s-1 with lower QL of 0.30 L/min, and N of 300 rpm. Further applying the penetration theory, of 0.0226 — 0.130 s-1 and of 0.0253 — 0.145 s-1 can be estimated in the conditions of the experiments with QL = 0.30 — 1.29 L/min, QG = 1.19 — 4.40 L/min, and N = 300 — 1500 rpm。. The HGRPB (system B) for semi-batch operation with recycle liquid is employed to the ozonation of RB5 in the fourth part of the experiments. Comparison of the efficiencies of ozonation with ozone introduced in different reactors, say HGRPB and CSTR (continuous stirred tank reactor), is made. The volumes of HGRPB (VB) and CSTR (VT) are 0.185 and 5.5 L, respectively. By considering the effect of VB and VT, the average mineralization rates of RB5 in HGRPB of 0.582 — 3.124 mg/L2-min are about 20.7 — 25.3 times of those in CSTR of 0.023 — 0.151 mg/L2-min. The results indicate that HGRPB is more efficient than CSTR in per reactor volume basis.

碩士<br>國立成功大學<br>化學工程學系碩博士班<br>92<br>The investigation used H2O2/Fe2+, one of the chemical oxidation methods called Fenton, to treat reactive dye-Black B. And added UV light or electric field to improve removal efficiencies. Experimental results showed that when dye degraded by Fenton, would product formic acid and oxalic acid, which’s COD were ca half of actual measured, were major intermediates. The COD removal efficiencies was Photo-Fenton＞Fered-Fenton>Fenton. Fered-Fenton process applied H2O2 and electrogenerated Fe2+ produced via the reduction of ferric ion. When Fered-Fenton was operated under nice current efficiency, have well removal efficiencies for formic acid, but not for oxalic acid. In contrast, Photo-Fenton have well removal efficiencies for formic acid and oxalic acid. Through my investigation verified that, the reaction mechanism of Photo-Fenton was UV light reacted with ferrioxalate, proceeded reduced Fe2+ and degraded oxalic acid.

碩士<br>國立成功大學<br>化學工程學系碩博士班<br>93<br>This study combined Fenton’s reagent and light, called Photo-Fenton method, to treat azo dye Reactive Black B and phenol. There were two parts in this study. The first part was to evaluate the effect of pH, light, [Ox]/[Fe3+] molar ratio and dissolved oxygen on photoreduction reaction of ferric ions. The second one was to investigate the optimal operating conditions of pH, initial ferric ion concentration, hydrogen peroxide concentration, [Ox]/[Fe3+] molar ratio, dissolved oxygen and lights for treating Reactive Black B and phenol with Photo-Fenton method. 　　Results show that the optimal pH value was 3 for ferric ion reducing reaction. Increasing [Ox]/[Fe3+] molar ratio and UV light can accelerate reduction rate. Besides, the reduction rate was higher with N2 bubbling than that with aeration. 　　The optimal conditions to treat Reactive Black B with Photo-Fenton method were pH＝3 and [H2O2]＝400 mg/L. We found that increasing [Ox]/[Fe3+] molar ratio inhibited the degradation rate of Reactive Black B. The optimal [Ox]/[Fe3+] molar ratio for phenol oxidation were 2. It can be decolorized completely at this condition. Removal of COD and TOC for Black B solution were 86﹪and 86﹪ with Photo-Fenton method and those were 46﹪and 31﹪,respectively with Fenton-like method. Concerning the oxidation of phenol, the removal of COD and TOC for the solution can increase from 63﹪and 33﹪to 98﹪and 88﹪,respectively.

碩士<br>國立臺灣大學<br>環境工程學研究所<br>96<br>This study investigated the treatment of Reactive Black 5 (RB5) dye via various oxidation processes such as 1) electro-chemical oxidation (ECO), 2) combined ultraviolet (UV) with with ECO (UV/ECO), 3) ozonation with ECO (OZ/ECO) and 4) photo-ozonation with ECO (UV/OZ/ECO). On the efficiencies of decomposition of RB5 (ηRB5), true color removal (ηADMI, ADMI = American Dye Manufacturers Insititute) and total organic carbon removal (ηTOC), respectively. Effect of votage (Ev), power of UV (PUV), concentration of applied ozone (CO3,in) and pH value were evaluated. The results showed that ηRB5 and ηADMI were about 71 and 75% at reaction time (t) of 2 h, for the ECO process with Ev = 1.5 volts (V). However, ηTOC was less than 2%. For the UV/ECO processes with Ev = 1.5 V and PUV = 13 watts (W), ηRB5, ηADMI and ηTOC were 99, 92 and 2% at t = 30 min, and 99, 99 and 5% at t = 2h. The results indicated that the introduction of UV enhances the ηRB5 and ηADMI, significantly, while the ηTOC moderately.During OZ/ECO processes with CO3,in = 16 mg L-1 and Ev = 1.5 V, RB5 and true color were almost completely removaled in 30 min and with ηTOC increased to 64% at 2 h. The corresponding ηRB5 , ηADMI and ηTOC for the sole OZ process were 99, 99 and 27%, and ηTOC = 64% at t = 2 h. Increaseing Ev from 1.5 to 3 V for the OZ/ECO, resulted in an increased of from 64 to 84% in 2 h. An increase of CO3,in from 16 to 20 mg L-1 further increased ηTOC 64% to 94% at 2 h for the OZ/ECO processes. As for the UV/OZ/ECO processes with PUV = 13 W, CO3,in = 16 mg L-1 and Ev = 1.5 V, RB5 and true color were almost completely removaled at 15 min with ηTOC = 22%. The values of ηTOC 94% at 45 min. As CO3,in increased from 16 to 20 mg L-1, TOC was almost removal in 45 min.