投加羟胺原位恢复城市污水短程硝化-厌氧氨氧化工艺

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Abstract

The effective inhibition or wash-out of nitrite oxidizing bacteria (NOB) is the key challenge for the application of partial nitritation/anammox (PA/N) process in domestic wastewater treatment. The deteriorated domestic wastewater PN/A system was used to investigate the recovery effect of hydroxylamine (NH₂OH) concentration and dosing mode on it. The nitrate (NO₃^--N) production ratio of the PN/A system was 0.90, which was due to the overgrowth of NOB. The results showed that when the initial NH₂OH concentration was 10mg/L in the sequencing batch reactor (SBR) and NH₂OH was added once a day, the ratio of NO₃^--N_producted/NH₄⁺-N_consumed was decreased from 0.90 to 0.11 after adding NH₂OH for 20d. It indicated that NH₂OH (10mg/L) addition could restore PN/A process in-situ. The ratio of NO₃^--N_producted/NH₄⁺-N_consumed increased to 0.15 again after stopping NH₂OH addition for 59d. When continued to add NH₂OH into reactor for 5d, the PN/A process operated well. Therefore, the intermittent addition of NH₂OH strategy could maintain the stable performance of the PN/A process. The real-time quantitative PCR results showed that the NOB abundance was decreased continuously from (4.52±0.44)×10¹⁰copies/g VSS (Day 6) to (2.30±0.80)×10⁹copies/g VSS (Day 157) after NH₂OH (10mg/L) addition. It indicated that NH₂OH addition was beneficial to inhibit and wash out NOB.

Key words： hydroxylamin (NH₂OH) partial nitritation/anammox (PN/A) NOB demostic wastewater

Received: 03 December 2018

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X703

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	LI Jia
	LI Xi-yao
	ZHANG Qiong
	PENG Yong-zhen

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LI Jia,LI Xi-yao,ZHANG Qiong等. In-situ restoring demostic wastewater partial nitritation/anammox (PN/A) process by addition of hydroxylamine[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 2789-2795.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I7/2789

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