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Waste Water Treatment of Dye Contamination

Author(s): Pattana Boonyaprapa

Journal: EnvironmentAsia
ISSN 1906-1714

Volume: 2;
Issue: 1;
Start page: 49;
Date: 2009;
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Keywords: tie-dye wastewater | cow’s feces ferment | upflow anaerobic filter

The objectives of this research were to study tie-dye process data and wastewater characteristics from 60 entrepreneurs, and to study the colour density treatment in pilot scale by using upflow anaerobic filters. From 60 filled-out questionnaires, it was found that all tie-dye entrepreneurs used reactive dyes by a hot method. Ninety-eight percent of the tie-dye enterpreneurs produced wastewater at the rate of not more than 1500 liters per day. All of them lacked tie-dye wastewater treatment systems. Eighty-five percent of tie-dye entrepreneurs agreed that there must be wastewater treatment before release into the environment. From group discussions, it was found that the entrepreneurs realized the wastewater problem and wanted to carry out environment friendly tie-dyeing. Our study demonstrated that the average value of the colour density, chemical oxygen demand (COD), total dissolved solids (TDS) and pH of the wastewater characteristics were 170 SU (space units), 1584 mg/l, 2487 mg/l and 8, respectively. For the upflow anaerobic filter, 5 sets of experiments, with 24 hours retention time, were designed, with 0, 1, 2, 3 and 4 % of cow’s feces ferment, respectively (sets 1st-5th). The result showed decreasing colour densities from 170 SU to 160 SU (dark colour), 60 SU (very light colour), 12 SU (no colour), 10 SU (no colour) and 10 SU (no colour), respectively. We conclude that the upflow anaerobic filter, containing 2% cow’s feces ferment is an efficient way to reduce colour density of the wastewater. Mixing cow’s feces ferment with tie-dye wastewater increased COD and TDS in wastewater. Mean COD was increased by residual organic matter from 1584 mg/l (before treatment) to (after-treatment, sets 2nd- 5th) 1600 mg/l, 1680 mg/l, 1710 mg/l and 1750 mg/l, respectively. COD aftertreatment was higher than the industrial effluence standard (400 mg/l). Further treatment COD might include wetland procedures. TDS was increased by some residual organic matter from before-treatment 2487 mg/l to after-treatment (sets 2nd- 5th) 2490 mg/l, 2510 mg/l, 2611 mg/l and 2670 mg/l, respectively. TDS after-treatment was lower than the industrial effluence standard (3000 mg/l).
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