FNA处理絮体污泥恢复城市污水PN/A工艺短程硝化

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Abstract In order to assess the feasibility of restoring sewage partial nitritation/anammox (PN/A) process using free nitrous acid (FNA) to treat flocculent sludge, the effect of different concentrations of FNA on the activities of ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) was studied. Besides, the variations of nutrient removal performance in the SBR reactor by twice FNA treatment were investigated. The results showed that NOB activity could be inhibited when the flocculent sludge treated by FNA of 0.45mgHNO₂-N/L and the nitrite accumulation rate (NAR) reached 88.8%, but NOB activity recovered from the 8^th day. While NOB activity could be significantly inhibited when the flocculent sludge treated by FNA of 1.35mgHNO₂-N/L, and the NAR reached 89.1%. Meanwhile the activities of AOB was also inhibited, and NH₄⁺-N conversion rate decreased to 6.8%. By enhancing the ratio of aerobic time to anoxic time (t_好/t_缺:from 0.4~2.7) and increasing dissolved oxygen (DO:from 0.2~1.5mg/L), the AOB activity recovered, and NH₄⁺-N conversion rate reached 77.8%. But the activities of NOB was not recovered within 150days, and the NAR achieved 98.1%. With the stable achievement of nitritation, the nitrogen removal performance of the system gradually restored, the average effluent total inorganic nitrogen (TIN) was 8.2mg/L, and the average TIN efficiency was 84.1%. Therefore, the strategy by first treating flocculent sludge with higher FNA to inhibite both AOB and NOB, then increasing t_好/t_缺 and DO to restore AOB activity, could achieve the restoration of PN/A process.

Key words： free nitrous acid partial nitritation/anammox nitrite oxidizing bacteria restoration sewage

Received: 18 February 2019

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X703

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	Articles by authors
	WANG Zeng-hua
	WANG Bo
	GONG Xiao-fei
	QIAO Xin
	PENG Yong-zhen

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WANG Zeng-hua,WANG Bo,GONG Xiao-fei等. Restoration of nitritation of the sewage partial nitritation/anammox (PN/A) proccess using free nitrous acid to treat flocculent sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3308-3315.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3308

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