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Evaluation of substrate removal kinetics for UASB reactors treating chlorinated ethanes

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Title Evaluation of substrate removal kinetics for UASB reactors treating chlorinated ethanes
 
Creator BASU, D
ASOLEKAR, SR
 
Subject Chlorinated ethanes
Kinetic constants
UASB reactor
HRT
Substrate removal
METHANOGENIC GRANULAR SLUDGE
REDUCTIVE DECHLORINATION
WASTE-WATER
DEGRADATION KINETICS
TETRACHLOROETHYLENE
TRANSFORMATIONS
BIODEGRADATION
1,1,2,2-TETRACHLOROETHANE
1,2-DICHLOROETHANE
 
Description Lack of focus on the treatment of wastewaters bearing potentially hazardous pollutants like 1,1,2 trichloroethane and 1,1,2,2 tetrachloroethane in anaerobic reactors has provided an impetus to undertake this study. The objective of this exercise was to quantify the behavior of upflow anaerobic sludge blanket reactors and predict their performance based on the overall organic substrate removal. The reactors (wastewater-bearing TCA (R2), and wastewater-bearing TeCA (R3)) were operated at different hydraulic retention times (HRTs), i.e., 36, 30, 24, 18, and 12 h corresponding to food-to-mass ratios varying in the range of 0.2-0.7 mg chemical oxygen demand (COD) mg(-1) volatile suspended solids day(-1). The process kinetics of substrate utilization was evaluated on the basis of experimental results, by applying three mathematical models namely first order, Grau second order, and Michaelis-Menten type kinetics. The results showed that the lowering of HRT below 24 h resulted in reduced COD removal efficiencies and higher effluent pollutant concentrations in the reactors. The Grau second-order model was successfully applied to obtain the substrate utilization kinetics with high value of R (2) (> 0.95). The Grau second-order substrate removal constant (K (2)) was calculated as 1.12 and 7.53 day(-1) for reactors R2 and R3, respectively. This study demonstrated the suitability of Grau second-order kinetic model over other models, for predicting the performance of reactors R2 and R3, in treating wastewaters containing chlorinated ethanes under different organic and hydraulic loading conditions.
 
Publisher SPRINGER HEIDELBERG
 
Date 2014-10-17T05:02:51Z
2014-10-17T05:02:51Z
2012
 
Type Article
 
Identifier ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 19(6)2419-2427
http://dx.doi.org/10.1007/s11356-012-0754-y
http://dspace.library.iitb.ac.in/jspui/handle/100/16017
 
Language en