scholarly journals Cytotoxicity assays to evaluate tannery effluents treated by photoelectrooxidation

2015 ◽  
Vol 75 (4 suppl 2) ◽  
pp. 53-61 ◽  
Author(s):  
N. Jaeger ◽  
J. P. Moraes ◽  
C. R. Klauck ◽  
G. Gehlen ◽  
M. A. S. Rodrigues ◽  
...  
Keyword(s):  
Treatment Process ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Cultured Cells ◽  
Industrial Effluent ◽  
Neutral Red ◽  
Treatment Efficiency ◽  
Cytotoxic Potential ◽  
Tannery Effluents ◽  
Cytotoxicity Assays

The advanced oxidation process (AOP) is used to increase the treatment efficiency of effluents however, it is necessary to compare the toxicity of treated and untreated effluents to evaluate if the decontamination process does not cause any biological harm. Cultured cells have been previously used to assess the genotoxic and cytotoxic potential of various compounds. Hence, the aim of this work was to assess the applicability of cytotoxicity assays to evaluate the toxicity related to the AOP treatment. Samples of an industrial effluent were collected after their treatment by a conventional method. Cytotoxicity of standard and AOP treated effluents was assessed in CRIB and HEp-2 cell line using the MTT and neutral red assays. We observed decrease at cell viability in the both assays (50% MTT and 13% NRU) when cells were exposed to the AOP treatment in the highest concentration. Thus, cytotoxic assays in cultured cells can be explored as an useful method to evaluate toxicity as well as to optimize effluents treatment process.

Study on the Effect of Different Water Treatment Technology on Removing 2-MIB

2014 ◽  
Vol 587-589 ◽  
pp. 594-597
Author(s):  
Ping Xia ◽  
Dong Zhang ◽  
Zheng Wang ◽  
Hui Ye ◽  
Yu Qiong Shen ◽  
...  
Keyword(s):  
Water Treatment ◽  
Treatment Process ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Removal Rate ◽  
Pilot Test ◽  
Control Technology ◽  
Odor Control ◽  
Treatment Technology ◽  
Water Treatment Process

To compare the removal efficiency of 2-MIB by traditional water treatment, prechlorination, O3-BAC, MIEX pre adsorption and UV/H2O2 advanced oxidation process, the pilot-test of drinking water odor control technology were studied in this paper. The results showed that the traditional water treatment process had poor effect on removing 2-MIB, with about 10% removal rate, while the O3-BAC process was the best at removing 2-MIB, whose removal rate reached over 90%. And the 2-MIB removal rate of UV/H2O2 process was about 55% and that of prechlorination process was about 20%. However, the MIEX pretreatment process had almost no effect on removing 2-MIB.

Application of Response Surface Methodology to Optimise C.I. Acid Orange 7 Azo Dye Mineralization by UV/H2O2 Process

2008 ◽  
Vol 11 (3) ◽  
Author(s):  
Mohammad E. Olya ◽  
Masoud B. Kasiri ◽  
Hamid Aleboyeh ◽  
Azam Aleboyeh
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Azo Dye ◽  
Treatment Process ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Operating Conditions ◽  
Acid Orange 7 ◽  
Acid Orange ◽  
Independent Parameters

AbstractThe mineralization of C.I. Acid Orange 7 (AO7) azo dye by UV/H2O2 Advanced Oxidation Process was studied in a flux through annular photoreactor. An experimental design based on Response Surface Methodology (RSM) was applied to evaluate the simple and combined effects of influencing independent parameters on mineralization efficiency and optimising the operating conditions of the treatment process. A 2

A review of the application of sonophotocatalytic process based on advanced oxidation process for degrading organic dye

2019 ◽  
Vol 34 (4) ◽  
pp. 365-375 ◽  
Author(s):  
Abraham Amenay Zewde ◽  
Lingling Zhang ◽  
Zifu Li ◽  
Emanuel Alepu Odey
Keyword(s):  
Organic Matter ◽  
Treatment Process ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Emerging Technology ◽  
Organic Dye ◽  
Inorganic Contaminants ◽  
Aqueous Streams ◽  
Conventional Wastewater Treatment

Abstract Nowadays the use of conventional wastewater treatment methods is becoming increasingly challenging mainly due to the presence of organic matter in wastewater. Therefore, an emerging technology is needed to deal with these highly concentrated and toxic non-biodegradable organic matters. In the last few decades, advanced oxidation process (AOP) has emerged to treat wastewaters discharged from industries. Recently, researchers have shown interest to use the application of ultrasound (US) in photocatalysis, i.e. sonophotocatalysis, to improve the performance of the treatment process in the degradation of organic and inorganic contaminants in aqueous streams. Sonophotocatalysis is the combination of the use of ultraviolet (UV) and US.

Oxidative treatment characteristics of biotreated textile-dyeing wastewater and chemical agents used in a textile-dyeing process by advanced oxidation process

2004 ◽  
Vol 49 (5-6) ◽  
pp. 137-143 ◽  
Author(s):  
B.-R. Lim ◽  
H.-Y. Hu ◽  
K.-H. Ahn ◽  
K. Fujie
Keyword(s):  
Hydrogen Peroxide ◽  
Biological Treatment ◽  
Treatment Process ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Dyeing Wastewater ◽  
Dyeing Process ◽  
Textile Dyeing ◽  
Textile Dyeing Wastewater

The oxidative treatment characteristics of biotreated textile-dyeing wastewater and typical chemicals such as desizing, scouring, dispersing and swelling agents used in the textile-dyeing process by advanced oxidation process were experimentally studied. The refractory organic matters remained in the effluent of biological treatment process without degradation may be suitable for the improvement of biodegradability and mineralized to CO2 by combined ozonation with and without hydrogen peroxide. On the other hand, the refractory chemicals contained in the scouring agent A and swelling agent may not be mineralized and their biodegradability may not be improved by ozonation. However, the BOD/DOC ratio of scouring agent B increased from 0.3 to 0.45 after ozonation. Based on the results described above, advanced treatment process involving the ozonation without and with the addition of hydrogen peroxide, followed by biological treatment was proposed for the treatment of refractory wastewater discharged from the textile-dyeing process.

Photo-degradation of monoazo dye blue 13 using advanced oxidation process

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Aqueous Solution ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
High Energy ◽  
Uv Exposure ◽  
H2o2 Concentration ◽  
Oxidizing Agent ◽  
Photo Degradation ◽  
High Energy Radiation ◽  
Uv Lamp

The high energy radiation overcome the bonding of solute in a solution and H2O2 acts as an oxidizing agent and generates a free radical in the solution which results in photo-degradation by converting the solute in to simple form and resultantly, colored substance under the effect of photo-degradation becomes colorless. The photo-degradation of monoazo dye Blue 13 in an aqueous solution was investigated using a laboratory scale UV lamp in the presence of H2O2 and for maximum degradation of dye, the independent parameter UV power, UV exposure time, pH and H2O2 concentration were optimized. It was found that neither UV in the presence of H2O2 is able to degrade Blue 13 under optimum condition. The results revealed that the use of both UV and H2O2 have pronounced effect on the discoloration of dyes which could be used for management of textile effluents contain waste dyes.

Obtaining Secondary Treatment with RBC/Underflow Clarifiers

1982 ◽  
Vol 14 (6-7) ◽  
pp. 429-442
Author(s):  
I L Bogert
Keyword(s):  
Treatment Process ◽  
High Rate ◽  
Experimental Program ◽  
Secondary Treatment ◽  
Lower Zone ◽  
Treatment Efficiency ◽  
Winter Conditions ◽  
Rotating Biological Contactors ◽  
One Year ◽  
The U.S

A one-year experimental program conducted at Edgewater, New Jersey, U.S.A. evaluated the concept of providing secondary treatment by the installation of rotating biological contactors (RBC's) in modified primary sedimentation tanks. A primary tank was divided horizontally into two zones separated by an intermediate floor. Four RBC's were placed in the upper zone. The lower zone provided secondary sedimentation. High rate primary sedimentation was provided to remove grit and trash without removing substantial portions of BOD and SS. The experimental program funded by the U.S. EPA and the Borough of Edgewater was conducted over a full year at different loads. The system proved to be an effective secondary treatment process with little difference in treatment efficiency between summer and winter conditions.

The application of the root zone method for the treatment and reuse of high-strength abattoir waste in Mexico

1997 ◽  
Vol 35 (5) ◽  
pp. 271-278 ◽  
Author(s):  
Fermin Rivera ◽  
Alan Warren ◽  
Colin R. Curds ◽  
Esperanza Robles ◽  
Alejandro Gutierrez ◽  
...  
Keyword(s):  
Treatment Process ◽  
Root Zone ◽  
Ornamental Plants ◽  
High Strength ◽  
Faecal Coliforms ◽  
Treatment Efficiency ◽  
Zone Method ◽  
Stage System ◽  
Flow Through ◽  
Two Stages

A two-stage system for treating high-strength wastewater from an abattoir at Pachuca, Mexico is described. The system consists of an anaerobic digester followed by an artificially-constructed wetland which employs horizontal subsurface flow through the root zone of emergent hydrophytes planted in a gravel substrate. The main goals of this study were to monitor the treatment efficiency of the system for the first twelve months of operation and to assess the suitability of the effluent for irrigation purposes. The treatment efficiency during the twelve month period was generally good with mean removal efficiencies of 88.5% for BOD5, 87.4% COD, 89% suspended solids, 73.6% organic nitrogen and >99% faecal coliforms. Removal rates were generally poor for orthophosphates, NH3-nitrogen and NO3-nitrogen. The differing roles of the two stages in the treatment process are discussed. Although not suitable for irrigating crops, the effluent is being successfully used for the irrigation of ornamental plants and recreational lands.

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