scholarly journals Photocatalytic and Biological Oxidation Treatment of Real Textile Wastewater

2021 ◽  
Author(s):  
Teklit Gebregiorgis
Keyword(s):  
Developing Countries ◽  
Large Volume ◽  
Biological Treatment ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Chemical Oxidation ◽  
Biological Oxidation ◽  
Industrial Site ◽  
Economic Activities ◽  
Oxidation Treatment

With rapidly growing urbanization and industrialization in developing countries, a large volume of wastewater is produced from industries that contain chemicals generating high environmental risks, which could affect health and socio-economic activities if not treated properly. In this study, the discoloration of wastewater containing azo dyes by chemical oxidation process combined with a biological treatment was evaluated and applied on real textile wastewater generated from one Ethiopian industrial site. The use of TiO2 as a photocatalyst and the effect of the addition of H2O2 on color removal were investigated. Photocatalysis was followed by aerobic biological treatment and their combination resulted in 93.3 and 90.4% removal of color and chemical oxygen demand (COD), respectively. These results revealed that the combination of photocatalytic and biological treatment approach shows a promising potential for the removal of color from real textile wastewater.

scholarly journals Photocatalytic and biological oxidation treatment of real textile wastewater

2020 ◽  
Vol 5 (3) ◽  
Author(s):  
Teklit Gebregiorgis Ambaye ◽  
Kiros Hagos
Keyword(s):  
Biological Treatment ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Cost Effective ◽  
Pilot Scale ◽  
Chemical Oxidation ◽  
Color Removal ◽  
Oxidation Treatment ◽  
Low Energy Consumption ◽  
Direct Extrapolation

Abstract In this study, the discoloration of wastewater containing azo dyes by chemical oxidation process combined with a biological treatment was evaluated and applied to real textile wastewater generated from one Ethiopian industrial site. The use of TiO2 as photocatalyst and the effect of the addition of H2O2 on color removal was first investigated. Photocatalysis was followed by aerobic biological treatment, and their combination resulted in a high extent of color removal (93.3%) and chemical oxygen demand (COD) reduction (90.4%). This was reached without pH correction and with low energy consumption compared to the implementation of AOPs alone. This study performed with real textile wastewater allows the direct extrapolation of the data for the design of a cost-effective and applicable treatment procedure at a pilot scale. Graphic abstract

Degradation of wine distillery wastewaters by the combination of aerobic biological treatment with chemical oxidation by Fenton's reagent

2005 ◽  
Vol 51 (1) ◽  
pp. 167-174 ◽  
Author(s):  
J. Beltran de Heredia ◽  
J. Torregrosa ◽  
J.R. Dominguez ◽  
E. Partido
Keyword(s):  
Chemical Oxygen Demand ◽  
Aromatic Compounds ◽  
Biological Treatment ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Chemical Oxidation ◽  
Utilization Rate ◽  
Fenton’S Reagent ◽  
Kinetic Rate Constant ◽  
Fenton's Reagent

The degradation of wine distillery wastewaters by aerobic biological treatment has been investigated in a batch reactor. The evolution of the chemical oxygen demand, biomass and total contents of polyphenolic and aromatic compounds was followed through each experiment. According to the Contois model, a kinetic expression for the substrate utilization rate is derived, and its biokinetic constant is evaluated. The final effluents of the aerobic biological experiments were oxidized by Fenton's reagent. The evolution of chemical oxygen demand, hydrogen peroxide concentration and total contents of polyphenolic and aromatic compounds was followed through each experiment. A kinetic model to interpret the experimental data is proposed. The kinetic rate constant of the global reaction is determined.

Application of Persulfate in Textile Wastewater Treatment

2019 ◽  
pp. 70-98
Author(s):  
Fagbenro Oluwakemi Kehinde ◽  
Salem S. Abu Amr ◽  
Hamidi Abdul Aziz
Keyword(s):  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Primary Objective ◽  
Biological Oxidation ◽  
Healthy Environment ◽  
Clean Environment ◽  
Textile Dyeing ◽  
Textile Wastewater Treatment

As textile and dyeing industries increase, pollution due to effluent discharges from the same industries also increase and become of great concern to a healthy environment. In an attempt to understand the generation and treatment of textile wastewater, this chapter discusses the processes from which textiles are made, items of importance that are used in the production process which may account for the characteristics of the wastewater and persulfate, applied in the treatment of textile wastewater. Although these wastewaters are generally characterized by color, fluctuating pH, heat, salts, suspended solids (SS), the presence of metal ions, biological oxidation demand (BOD), and chemical oxygen demand (COD), color is the most obvious. The presence of color in the effluents from textile dyeing and finishing is due to the inefficient dyeing processes, resulting in unfixed forms of the dyestuff. To achieve the primary objective of obtaining a clean environment, there is a need for continuous monitoring of textile wastewater discharges, of which major concern is color.

scholarly journals Comparison of coagulation, ozone and ferrate treatment processes for color, COD and toxicity removal from complex textile wastewater

2017 ◽  
Vol 76 (5) ◽  
pp. 1001-1010 ◽  
Author(s):  
Sameena N. Malik ◽  
Prakash C. Ghosh ◽  
Atul N. Vaidya ◽  
Vishal Waindeskar ◽  
Sera Das ◽  
...  
Keyword(s):  
Spinacia Oleracea ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Optimal Dose ◽  
Contaminant Removal ◽  
Potassium Ferrate ◽  
Comparative Performance ◽  
Oxidation Treatment ◽  
Chromophore Group ◽  
Treatment Processes

In this study, the comparative performance of coagulation, ozone, coagulation + ozone + coagulation and potassium ferrate processes to remove chemical oxygen demand (COD), color, and toxicity from a highly polluted textile wastewater were evaluated. Experimental results showed that ferrate alone had no effect on COD, color and toxicity removal. Whereas, in combination with FeSO4, it has shown the highest removal efficiency of 96.5%, 83% and 75% for respective parameters at the optimal dose of 40 mgL−1 + 3 ml FeSO4 (1 M) in comparison with other processes. A seed germination test using seeds of Spinach (Spinacia oleracea) also indicated that ferrate was more effective in removing toxicity from contaminated textile wastewater. Potassium ferrate also produces less sludge with maximum contaminant removal, thereby making the process more economically feasible. Fourier transform infrared spectroscopy (FTIR) analysis also shows the cleavage of the chromophore group and degradation of textile wastewater during chemical and oxidation treatment processes.

scholarly journals Treatment of Real Textile Wastewater Using Electron Beam Irradiation

2019 ◽  
Vol 27 (2) ◽  
pp. 303-316 ◽  
Author(s):  
Nguyen Ngoc Duy ◽  
Dang Van Phu ◽  
Nguyen Thi Kim Lan ◽  
Nguyen Thanh Duoc ◽  
Nguyen Quoc Hien ◽  
...  
Keyword(s):  
Electron Beam ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Chemical Oxidation ◽  
Color Removal ◽  
Reactive Black 5 ◽  
Radiation Process ◽  
Radiation Technology ◽  
Textile Dyeing ◽  
Beam Method

Abstract Textile wastewater is known to have a large number of hazardous pollutants, intense color and high chemical oxygen demand (COD) concentration. The electron beam method is considered useful in treatment textile wastewater through chemical oxidation process. In this study, three real textile wastewaters (Sample 1: Reactive Black 5, Reactive Red 10, and Reactive Orange 13; Sample 2: Reactive Red 10 and Yellow GR; Sample 3: Reactive Black 5 and Turquoise Blue HF–G) from textile dyeing company in Ho Chi Minh city were treated by electron beam method. The effect of absorbed doses and hydrogen peroxide (H2O2) at different concentrations on the change of pH, removal capacity, COD and five day’s biological oxygen demand (BOD5) were investigated. The results indicated that color, COD, BOD5 and pH decreased with increasing absorbed dose. A sufficient amount of H2O2 in the radiation process could accelerate the color removal process. In the same condition, a color removal efficiency of ~90% was obtained with EB/H2O2, in contrast with color loss by using EB alone (~71%). These results highlighted the potential of EB radiation technology for treatment of textile dyeing wastewater.

A Combined Chemical Reduction and Biological Oxidation Process for the Treatment of Textile Wastewater

2001 ◽  
Vol 36 (3) ◽  
pp. 605-617 ◽  
Author(s):  
Mohammad R. Haghighi Podeh ◽  
Mitra Sarhadi ◽  
Seyyed M. Ghoreishi
Keyword(s):  
Sodium Borohydride ◽  
Biological Treatment ◽  
Chemical Reduction ◽  
Textile Wastewater ◽  
Treatment System ◽  
Treated Wastewater ◽  
Experimental Comparison ◽  
Treatment Technique ◽  
Biological Oxidation ◽  
Sodium Borohydride Reduction

Abstract We report on the effectiveness of a combined reduction-biological treatment system for the decolourization of non-biodegradable textile dyeing wastewater. In this treatment system a bisulfite-catalyzed sodium borohydride reduction followed by activated sludge technique was used in order to remove the colours at ambient temperature and pressure. This experimental investigation consisted of two major parts: reduction treatment and biological oxidation. Both synthetic and actual wastewaters were used in this research. Synthetic wastewaters were made by several groups of dyes such as direct, basic and reactive colours. Actual wastewaters were collected from two different textile industries in the city of Isfahan, Iran. The characterization of raw and treated wastewater was carried out by infrared and ultraviolet spectrometers. The ASTM-E450-82 method was used to measure the colour. The results of this study demonstrated that this biological treatment technique decreased colour, BOD, COD and TSS by 74 to 88%, 97 to 100%, 76 to 83% and 92 to 97%, respectively. The IR and UV analyses showed that nonbiodegradable dyes are converted to biodegradable organic compounds such as alkyl and alkens. Another major advantage of this method with respect to other methods, namely, adsorption and coagulation, was that it removes colour without causing any disposal problem. The optimum dosage for treatment of actual wastewaters was found to be 50 to 60 mg/L for catalyst bisulfite and 200 to 250 mg/L for sodium borohydride. Finally, a benchscale experimental comparison of this technique with other combined chemical and biological methods currently used showed higher efficiency and lower cost for the newly developed technique.

scholarly journals AOX removal from industrial wastewaters using advanced oxidation processes: assessment of a combined chemical–biological oxidation

2013 ◽  
Vol 68 (9) ◽  
pp. 2048-2054 ◽  
Author(s):  
J. Luyten ◽  
K. Sniegowski ◽  
K. Van Eyck ◽  
D. Maertens ◽  
S. Timmermans ◽  
...  
Keyword(s):  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Chemical Oxidation ◽  
Wastewater Sample ◽  
Biological Oxidation ◽  
Selective Degradation ◽  
The Matrix ◽  
Aox Removal ◽  
High Chloride

In this paper, the abatement of adsorbable halogenated organic compounds (AOX) from an industrial wastewater containing relatively high chloride concentrations by a combined chemical and biological oxidation is assessed. For chemical oxidation, the O3/UV, H2O2/UV and photo-Fenton processes are evaluated on pilot scale. Biological oxidation is simulated in a 4 h respirometry experiment with periodic aeration. The results show that a selective degradation of AOX with respect to the matrix compounds (expressed as chemical oxygen demand) could be achieved. For O3/UV, lowering the ratio of O3 dosage to UV intensity leads to a better selectivity for AOX. During O3-based experiments, the AOX removal is generally less than during the H2O2-based experiments. However, after biological oxidation, the AOX levels are comparable. For H2O2/UV, optimal operating parameters for UV and H2O2 dosage are next determined in a second run with another wastewater sample.

An efficient biotreatment process for polyvinyl alcohol containing textile wastewater

2013 ◽  
Vol 8 (3-4) ◽  
pp. 469-478 ◽  
Author(s):  
Sandip S. Magdum ◽  
Gauri P. Minde ◽  
Upendra S. Adhyapak ◽  
V. Kalyanraman
Keyword(s):  
Polyvinyl Alcohol ◽  
Process Optimization ◽  
Textile Wastewater ◽  
Cost Effective ◽  
Chemical Oxidation ◽  
High Rate ◽  
Microbial Consortia ◽  
Environment Friendly ◽  
Candida Sp ◽  
Textile Wastewater Treatment

The aim of this work was to optimize the biodegradation of polyvinyl alcohol (PVA) containing actual textile wastewater for a sustainable treatment solution. The isolated microbial consortia of effective PVA degrader namely Candida Sp. and Pseudomonas Sp., which were responsible for symbiotic degradation of chemical oxidation demand (COD) and PVA from desizing wastewater. In the process optimization, the maximum aeration was essential to achieve a high degradation rate, where as stirring enhances further degradation and foam control. Batch experiments concluded with the need of 16 lpm/l and 150 rpm of air and stirring speed respectively for high rate of COD and PVA degradation. Optimized process leads to 2 days of hydraulic retention time (HRT) with 85–90% PVA degradation. Continuous study also confirmed above treatment process optimization with 85.02% of COD and 90.3% of PVA degradation of effluent with 2 days HRT. This study gives environment friendly and cost effective solution for PVA containing textile wastewater treatment.

Determination of the Size Distribution of Dissolved Organics in Effluents

1973 ◽  
Vol 8 (1) ◽  
pp. 1-15 ◽  
Author(s):  
L.A. Addie ◽  
K.L. Murphy ◽  
J.L. Robertson
Keyword(s):  
Size Distribution ◽  
Biological Treatment ◽  
Oxygen Demand ◽  
Molecular Size ◽  
Monitoring Systems ◽  
Clean Surface ◽  
Sephadex Column ◽  
Dissolved Organics ◽  
Molecular Size Distribution

Abstract The importance of removing the small amounts of residual organics is increasing as the sources of clean surface water decrease. Knowledge of the nature of these soluble residual organics will be needed in order to assess the type of treatment required for their removal. Residual organics in three different biological treatment plants were analyzed and compared. An attempt was made to characterize these organics by a molecular size distribution on a Sephadex column monitored by differential ultraviolet and refractive index detectors. The organic carbon and chemical oxygen demand of the fractions collected from the column was also determined. An investigation of some of the problems inherent in the monitoring systems was conducted.

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