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Toxicity screening, assessment, and reduction in an industrial wastewater treatment plant
The toxicity reduction capacity of a central wastewater treatment plant (CWTP) receiving 21 000 metric ton/d of industrial wastewater was thoroughly investigated using a whole‐effluent approach with a Microtox™ Toxicity Analyzer System. It was found that the highly toxic wastewater introduced into the CWTP was almost completely detoxified during secondary treatment with a recycled activated‐sludge system. The removal mechanism was shown to be a combination of adsorption, volatilization, and biodegradation, the first two being more clear than the other. Fractionation of toxic streams within the treatment plant provided valuable information about the general characteristics of the toxicity‐causing agents in the wastewater, namely that they were primarily composed of filterable and dissolved solids, volatile organics, and nitrogenous compounds. A toxicity reduction evaluation survey within the plant revealed that the observed Microtox™ toxicity could be readily removed by treatment with powdered activated carbon (PAC) and mechanical aeration at properly selected operating conditions. The correlation between toxicity removal and the applied PAC dose was found to be exponential and asymptotic to the ultimate effective toxicant concentration of the effluent. Reductions in chemical oxygen demand and dissolved organic carbon during PAC treatment were also related to the applied PAC dose and the initial concentrations of the parameter. Removal of volatile components of toxicity by aeration was correlated with detention time by a power function.
Toxicity screening, assessment, and reduction in an industrial wastewater treatment plant
The toxicity reduction capacity of a central wastewater treatment plant (CWTP) receiving 21 000 metric ton/d of industrial wastewater was thoroughly investigated using a whole‐effluent approach with a Microtox™ Toxicity Analyzer System. It was found that the highly toxic wastewater introduced into the CWTP was almost completely detoxified during secondary treatment with a recycled activated‐sludge system. The removal mechanism was shown to be a combination of adsorption, volatilization, and biodegradation, the first two being more clear than the other. Fractionation of toxic streams within the treatment plant provided valuable information about the general characteristics of the toxicity‐causing agents in the wastewater, namely that they were primarily composed of filterable and dissolved solids, volatile organics, and nitrogenous compounds. A toxicity reduction evaluation survey within the plant revealed that the observed Microtox™ toxicity could be readily removed by treatment with powdered activated carbon (PAC) and mechanical aeration at properly selected operating conditions. The correlation between toxicity removal and the applied PAC dose was found to be exponential and asymptotic to the ultimate effective toxicant concentration of the effluent. Reductions in chemical oxygen demand and dissolved organic carbon during PAC treatment were also related to the applied PAC dose and the initial concentrations of the parameter. Removal of volatile components of toxicity by aeration was correlated with detention time by a power function.
Toxicity screening, assessment, and reduction in an industrial wastewater treatment plant
Ince, Nilsun H. (author) / Erdoğdu, Gülnaz (author)
Water Environment Research ; 70 ; 1170-1177
1998-09-01
8 pages
Article (Journal)
Electronic Resource
English
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