Internal loop photo-biodegradation reactor used for accelerated quinoline degradation and mineralization
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Biofilm biodegradation was coupled with ultra-violet photolysis using the internal loop photobiodegradation reactor for degradation of quinoline. Three protocols—photolysis alone (P), biodegradation alone (B), and intimately coupled photolysis and biodegradation (P&B)—were used for degradation of quinoline in batch and continuous-flow experiments. For a 1,000 mg/L initial quinoline concentration, the volumetric removal rate for quinoline was 38 % higher with P&B than with B in batch experiments, and the P&B kinetics were the sum of kinetics from the P and B experiments. Continuous-flow experiments with an influent quinoline concentration of 1,000 mg/L also gave significantly greater quinoline removal in P&B, and the quinoline-removal kinetics for P&B were approximately equal to the sum of the removal kinetics for P and B. P&B similarly increased the rate and extent of quinoline mineralization, for which the kinetics for P&B were nearly equal to the sum of kinetics for P and B. These findings support that the rate-limiting step for mineralization was transformation of quinoline, which was accelerated by the simultaneous action of photolysis and biodegradation.
KeywordsQuinoline Biodegradation Photolysis Biofilm
The authors acknowledge the financial support by the National Natural Science Foundation of China (50978164), Key project of basic research in Shanghai (11JC1409100), the Special Foundation of Chinese Colleges and Universities Doctoral Discipline (20113127110002), Special Fund of State Key Joint Laboratory of Environment Simulation and Pollution Control (13K09ESPCT), Open research funds from Zhejiang Provincial Key Laboratory of Water Science and Technology, Program of Shanghai Normal University (DZL123 and SK201336), and the United States National Science Foundation (0651794), National High Technology Research and Development Program 863(2013AA062705-1).
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