Application Research of Sulfur Autotrophic Denitrification Technology in Rural Sewage Treatment
Sulfur autotrophic denitrification filler and pyrite were respectively filled in the integrated sewage treatment equipment and constructed wetland to enhance the nitrogen removal effect. In the integrated sewage treatment equipment,the sulfur autotrophic denitrification filler was innovatively filled in the PP-shell and suspended in the rear anoxic tank. The TN removal value of the equipment is between 3.96 and 15.58 mg/L,and the average removal value is 8.52 mg/L. The TN removal amount of the rear anoxic tank accounts for 76.3％ of the total removal amount. Under the condition of short HRT,the maximum removal rate of TN can reach 83.8％,and the maximum removal amount of TN can reach 10.52 mg/L,and the constructed wetland has strong capacity for shock load,fast self-recovery speed. Regular pH change and actual water inflow and outflow detection all indicate that the constructed wetland has sulfur autotrophic denitrification. The effluent after two-stage sulfur autotrophic denitrification and enhances nitrogen removal reached and is superior to Grade A standard in GB 18918—2002.
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