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Sulfur-based autotrophic denitrification from the micro-polluted water

Weili Zhou , Xu Liu , Xiaojing Dong , Zheng Wang , Ying Yuan , Hui Wang , Shengbing He


Received July 07, 2015,Revised January 07, 2016, Accepted January 12, 2016, Available online February 13, 2016

Volume 28,2016,Pages 180-188

Eutrophication caused by high concentrations of nutrients is a huge problem for many natural lakes and reservoirs. Removing the nitrogen contamination from the low C/N water body has become an urgent need. Autotrophic denitrification with the sulfur compound as electron donor was investigated in the biofilter reactors. Through the lab-scale experiment, it was found that different sulfur compounds and different carriers caused very different treatment performances. Thiosulfate was selected to be the best electron donor and ceramsite was chosen as the suitable carrier due to the good denitrification efficiency, low cost and the good resistibility against the high hydraulic loads. Later the optimum running parameters of the process were determined. Then the pilot-scale experiment was carried out with the real micro-polluted water from the West Lake, China. The results indicated that the autotrophic denitrification with thiosulfate as electron donor was feasible and applicable for the micro-polluted lake water.

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