Synergistic analysis of sulfur autotrophic/heterotrophic denitrification under carbon source enhancement
WANG Qiaoru1,, SHI Xuan2, SONG Wei1, ZHANG Xiaolei1, LI Ji1,, 1.Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China 2.Shanghai Research Institute of Building Sciences, Shanghai 201108, China
Abstract:In order to strengthen the process of sulfur autotrophic denitrification, a small amount of carbon source was added to the sulfur autotrophic denitrification reactor, and the dosage was 5.99, 11.98, 23.96 mg·L?1. Then the changes of nitrate nitrogen, COD, sulfate and alkali consumption in the reactor before and after the dosing were analyzed, the efficiency and reaction mechanism of sulfur autotrophic denitrification under carbon source enhancement were studied. The results showed that adding a small amount of carbon source dosing could enhance the nitrate removal effect during autotrophic denitrification process; the COD utilization ratios at three dosages of carbon resource were above 85%, but the yield of sulphate didn’t decrease. The actual alkali consumption of the system at the dosage of 5.99 mg·L?1 was more than the theoretical alkali consumption measured by sulfate and COD, while the actual alkali consumption at the dosages of 11.98 mg·L?1 and 23.96 mg·L?1 were between the two theoretical values. After adding carbon source, the efficiency of autotrophic denitrification was significantly improved, and the trend of heterotrophic denitrification increased with the increase of carbon source input. Key words:autotrophic denitrification/ synergistic denitrification/ carbon source enhancement.
图1硫自养反硝化填充床实验装置 Figure1.Sulfur autotrophic denitrification packed bed reactor
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1.Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China 2.Shanghai Research Institute of Building Sciences, Shanghai 201108, China Received Date: 2018-12-05 Accepted Date: 2019-06-05 Available Online: 2020-11-11 Keywords:autotrophic denitrification/ synergistic denitrification/ carbon source enhancement Abstract:In order to strengthen the process of sulfur autotrophic denitrification, a small amount of carbon source was added to the sulfur autotrophic denitrification reactor, and the dosage was 5.99, 11.98, 23.96 mg·L?1. Then the changes of nitrate nitrogen, COD, sulfate and alkali consumption in the reactor before and after the dosing were analyzed, the efficiency and reaction mechanism of sulfur autotrophic denitrification under carbon source enhancement were studied. The results showed that adding a small amount of carbon source dosing could enhance the nitrate removal effect during autotrophic denitrification process; the COD utilization ratios at three dosages of carbon resource were above 85%, but the yield of sulphate didn’t decrease. The actual alkali consumption of the system at the dosage of 5.99 mg·L?1 was more than the theoretical alkali consumption measured by sulfate and COD, while the actual alkali consumption at the dosages of 11.98 mg·L?1 and 23.96 mg·L?1 were between the two theoretical values. After adding carbon source, the efficiency of autotrophic denitrification was significantly improved, and the trend of heterotrophic denitrification increased with the increase of carbon source input.
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