scholarly journals Ozone pre-oxidation of a textile industry wastewater for acute toxicity removal

2013 ◽  
Vol 8 (2) ◽  
pp. 95-102
Keyword(s):  
Acute Toxicity ◽  
Textile Industry ◽  
Transfer Rate ◽  
Cod Removal ◽  
Treated Wastewater ◽  
Colour Removal ◽  
Wastewater Pollution ◽  
Industry Wastewater ◽  
Raw Wastewater ◽  
Absorbance Band

In this work, pre-ozonation for degradation, decolourization and detoxicifying of a raw textile wastewater collected in a textile fininshing industry, Istanbul (Turkey) is investigated. Differing from the previous studies, a low ozone (O3) flow rate (9.6 mg min-1) was applied at original pH of the wastewater. The effect of pH varying from 5 to 11 and the H2O2 dose of 600 mg l-1 on ozone oxidation were also investigated. The acute toxicity of raw and treated wastewater samples were measured using 24 h newborn Daphnia magna. COD, colour in APHA Pt-Co (platin-cobalt) unit and absorbance at 450, 500 and 550 nm wave lengths which were coinciding the peak absorbance band of the raw wastewater were analyzed in treated samples. A 60% of acute toxicity, 92% of and 50% of total COD removal were obtained at original pH of wastewater by applying ozone for 30 min. Absorbed ozone dose was 105 mg l-1 with a ozone transfer rate of 3.5 mg l-1. Varying pH did not improve toxicity removal, however, soluble COD removal increased at 3 and 6% respectively for 9.0 and 11.0 values while colour removal increased (7%) only at 11.0 pH. Adding 600 mg l-1 of H2O2 increased COD removal at 10% after 20 min oxidation. Colour removal increase was more significant in O3/H2O2 oxidation in parallel with the increase in absorbance kinetics. All over results obtained this study are expected to contribute to control the textile industry wastewater pollution and to protect aquatic environment.

Experimental investigation of designed solar parabolic concentrator based desalination system for textile industry wastewater treatment

2021 ◽  
pp. 0958305X2110273
Author(s):  
Atin K Pathak ◽  
VV Tyagi ◽  
Sanjeev Anand ◽  
Richa Kothari
Keyword(s):  
Wastewater Treatment ◽  
Textile Industry ◽  
Average Energy ◽  
Pollutant Removal ◽  
Cod Removal ◽  
Maximum Output ◽  
Efficient Technology ◽  
Solar Desalination ◽  
Hardness Removal ◽  
Industry Wastewater

The escalation in demand for textile products increased the use of fresh water and treatment of wastewater; which escalates the search for suitable and energy-efficient technology for wastewater treatment. Solar assisted technology ( i.e. solar desalination) for the textile industry wastewater treatment is proved to be an affordable technology. The only drawback of solar desalination is its low productivity which is the major hindrance in the global acceptance of the system. In the present study, an ingenious improvement in form of a parabolic concentrator-based solar desalination system (PCB-SDS) is designed to overcome low productivity, and the simultaneous use of source textile industry wastewater for its treatment makes this study more realistic. The performance of the designed system was examined for three different brine depths i.e. 20%, 40%, and 60% for two different processing step i.e. Dyeing and Degumming. System performance was evaluated in terms of energetic, exergetic, pollutant removal, and economic analysis. The maximum output of the system was found to be around 7440 and 8330 mL/day on clear sunny days with textile dyeing wastewater (TDyWW) and textile degumming wastewater (TDgWW) at 60% depth respectively. Daily average energy and exergy efficiency of system varies in the range 39.8–51.9 and 3.6–4.8% respectively. The degumming wastewater shows 85% COD removal, whereas, around 90% of TDS and hardness removal was also recorded. The dyeing processed wastewater showed 80% COD removal efficiency, ≅90% TDS, and hardness removal. The cost per liter of distillate output produced from designed PCB-SDS was found to be 0.014 $/L.

scholarly journals Textile Industry Wastewater Color Removal Using Lemna Minor L and Lemna Minuta L

2018 ◽  
Vol 7 (3.34) ◽  
pp. 160
Author(s):  
D Sivakumar ◽  
R Anand ◽  
Asanammal Saral
Keyword(s):  
Process Parameters ◽  
Textile Industry ◽  
Contact Time ◽  
Ph Value ◽  
Lemna Minor ◽  
Optimum Process ◽  
Dilution Ratio ◽  
Colour Removal ◽  
Ph Values ◽  
Industry Wastewater

The influence of various nutrient dosages, dilution ratios and pH values was evaluated with different contact time against colour removal from textile industry wastewater using Lemna minor L and Lemna minuta L.  The optimum nutrient dosage, dilution ratio, and pH value was found to be 50 mg, 8 and 8 respectively. The maximum colour removal corresponding to the optimum process parameters value observed using Lemna minor L as 82.85 % and using Lemna minuta L as 89.5 %. Further, verification was done and showed that the maximum colour removal percentage from textile industry wastewater is lower than colour removal from an aqueous solution.  The results of this study concluded that Lemna minuta L removed more colour than Lemna minor L and both were identified to reproduce the obtained optimum process parameters and for removing colour in a textile industry wastewater.  

The effect of pre-ozonation on the H2O2/UV-C treatment of raw and biologically pre-treated textile industry wastewater

2002 ◽  
Vol 45 (12) ◽  
pp. 297-304 ◽  
Author(s):  
Í Arslan Alaton ◽  
I.A. Balcıog
Keyword(s):  
Removal Efficiency ◽  
Textile Industry ◽  
Textile Wastewater ◽  
Chemical Oxidation ◽  
Treated Wastewater ◽  
Average Increase ◽  
Toc Removal ◽  
Uv C ◽  
Ozonation Process ◽  
Industry Wastewater

Advanced chemical oxidation of raw and biologically pretreated wastewater by ozonation, H2O2/UV-C treatment and the successive combination of ozonation and H2O2/UV-C oxidation was investigated. For the raw textile wastewater, the application of successive O3 + H2O2/UV-C oxidation enhanced the COD and TOC removal efficiency of the H2O2 (50mM)/UV-C process by a factor of 13 and 4, respectively. In case of the biotreated textile wastewater, the preliminary ozonation step increased COD removal of the H2O2(10mM)/UV-C treatment system from 15% to 62%, and TOC removal from 0% to 34%, but did not appear to be more effective than applying a single ozonation process in terms of TOC abatement rates. Enhancement of the biodegradability was more pronounced for the biologically pre-treated wastewater with a two fold average increase in the BOD5/COD ratio for the studied chemical oxidation systems.

DECOLOURIZATION AND COD REMOVAL OF WASEWATER FROM ETHANOL PRODUCTION PROCESS FROM MOLASSES BY COAGULANTION USING INORGANIC ALUM

2010 ◽  
Vol 13 (3) ◽  
pp. 92-102
Author(s):  
Trung Duc Le
Keyword(s):  
Ethanol Production ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Treated Wastewater ◽  
Treatment Processes ◽  
Physico Chemical ◽  
Biological Methods ◽  
Treatment Step ◽  
Main Material

The industrial production of ethanol by fermentation using molasses as main material that generates large quantity of wastewater. This wastewater contains high levels of colour and chemical oxygen demand (COD), that may causes serious environmental pollution. Most available treatment processes in Vietnam rely on biological methods, which often fail to treat waste water up to discharge standard. As always, it was reported that quality of treated wastewater could not meet Vietnameses discharge standard. So, it is necessary to improve the treatment efficiency of whole technological process and therefore, supplemental physico-chemical treatment step before biodegradation stage should be the appropriate choice. This study was carried out to assess the effect of coagulation process on decolourization and COD removal in molasses-based ethanol production wastewater using inorganic coaglutant under laboratory conditions. The experimental results showed that the reductions of COD and colour with the utilization of Al2(SO4)3 at pH 9.5 were 83% and 70%, respectively. Mixture FeSO4 – Al2(SO4)3 at pH 8.5 reduced 82% of colour and 70% of COD. With the addition of Polyacrylamide (PAM), the reduction efficiencies of colour, COD and turbidity by FeSO4 – Al2(SO4)3 were 87%, 73.1% and 94.1% correspondingly. It was indicated that PAM significantly reduced the turbidity of wastewater, however it virtually did not increase the efficiencies of colour and COD reduction. Furthermore, the coagulation processes using PAM usually produces a mount of sludge which is hard to be deposited.

Catalytic wet air oxidation of dyeing and printing wastewater

1997 ◽  
Vol 35 (4) ◽  
pp. 311-319 ◽  
Author(s):  
L. Lei ◽  
X. Hu ◽  
H. P. Chu ◽  
G. Chen ◽  
P. L. Yue
Keyword(s):  
High Pressure ◽  
Reaction Time ◽  
Textile Industry ◽  
Porous Alumina ◽  
Supported Catalyst ◽  
Metal Salts ◽  
Treated Wastewater ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation

The treatment of dyeing and printing wastewater from the textile industry by oxidation was studied. The reaction was carried out in a two-litre high pressure reactor. In order to promote the oxidation of organic pollutants present in the wastewater, experiments were conducted using various catalysts including metal salts, metal oxides, and porous alumina supported metals. All catalysts tested were able to enhance the conversion of organic compounds in wastewater, shorten the reaction time, and lower the reaction temperature. The alumina supported catalyst has an advantage over other catalysts in that it can be easily separated from the treated wastewater by filtration and recycled. The conditions in preparing the catalyst supported by porous alumina were experimentally optimised.

Textile Wastewater Reuse: Ozonation of Membrane Concentrated Secondary Effluent

1999 ◽  
Vol 40 (4-5) ◽  
pp. 99-105 ◽  
Author(s):  
A. Lopez ◽  
G. Ricco ◽  
R. Ciannarella ◽  
A. Rozzi ◽  
A. C. Di Pinto ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Acute Toxicity ◽  
Wastewater Treatment Plant ◽  
Textile Industry ◽  
Nonionic Surfactants ◽  
Wastewater Reuse ◽  
Treatment Plant ◽  
Textile Wastewater ◽  
Secondary Effluent ◽  
Complete Disappearance

Among the activities appointed by the EC research-project “Integrated water recycling and emission abatement in the textile industry” (Contract: ENV4-CT95-0064), the effectiveness of ozone for improving the biotreatability of recalcitrant effluents as well as for removing from them toxic and/or inhibitory pollutants has been evaluated at lab-scale. Real membrane concentrates (pH=7.9; TOC=190 ppm; CDO=595 ppm; BOD5=0 ppm; Conductivity=5,000 μS/cm; Microtox-EC20=34%) produced at Bulgarograsso (Italy) Wastewater Treatment Plant by nanofiltering biologically treated secondary textile effluents, have been treated with ozonated air (O3conc.=12 ppm) over 120 min. The results have indicated that during ozonation, BOD5 increases from 0 to 75 ppm, whereas COD and TOC both decrease by about 50% and 30 % respectively. As for potentially toxic and/or inhibitory pollutants such as dyes, nonionic surfactants and halogenated organics, all measured as sum parameters, removals higher than 90% were achieved as confirmed by the complete disappearance of acute toxicity in the treated streams. The only ozonation byproducts searched for and found were aldehydes whose total amount continuously increased in the first hour from 1.2 up to 11.8 ppm. Among them, formaldehyde, acetaldehyde, glyoxal, propionaldehyde, and butyraldehyde were identified by HPLC.

scholarly journals Ecotoxicological and health concerns of persistent coloring pollutants of textile industry wastewater and treatment approaches for environmental safety

2021 ◽  
pp. 105012
Author(s):  
Roop Kishor ◽  
Diane Purchase ◽  
Ganesh Dattatraya Saratale ◽  
Rijuta Ganesh Saratale ◽  
Luiz Fernando R. Ferreira ◽  
...  
Keyword(s):  
Textile Industry ◽  
Environmental Safety ◽  
Treatment Approaches ◽  
Health Concerns ◽  
Industry Wastewater
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