中文关键词生物脱氮部分亚硝化(PN)厌氧氨氧化(ANAMMOX)低温市政污水 英文关键词biological nitrogen removalpartial nitritation (PN)ANAMMOXlow temperaturesewage

作者	单位	E-mail
刘文如	苏州科技大学环境科学与工程学院, 苏州 215009	liuwenru1987@126.com
杨殿海	同济大学环境科学与工程学院, 上海 200092
沈耀良	苏州科技大学环境科学与工程学院, 苏州 215009
王建芳	苏州科技大学环境科学与工程学院, 苏州 215009
吴鹏	苏州科技大学环境科学与工程学院, 苏州 215009
钱飞跃	苏州科技大学环境科学与工程学院, 苏州 215009
陈重军	苏州科技大学环境科学与工程学院, 苏州 215009

中文摘要 中低温条件下采用两级式PN-ANAMMOX工艺对低浓度NH₄⁺-N（50 mg·L^-1）污水进行高效脱氮过程研究.结果表明，20~14℃范围内PN-ANAMMOX工艺的脱氮负荷和TN去除率可分别维持在0.6 kg·（m³·d）^-1和80%以上；两级式PN-ANAMMOX工艺在限NO₂^--N和限NH₄⁺-N两种模式下均可保持稳定运行，其中限NH₄⁺-N运行模式为污水极限脱氮需求奠定了良好基础.当温度降至12℃时，PN-ANAMMOX工艺的脱氮负荷下降至0.5 kg·（m³·d）^-1左右，低温使得ANAMMOX反应成为工艺脱氮的限速步骤而对PN无明显影响.ANAMMOX污泥比PN颗粒污泥具有更高的温度敏感性，二者活性的温度系数分别为1.056和1.172.综上可知，对于低温条件下运行的两级式PN-ANAMMOX工艺，ANAMMOX菌体数量及活性是决定工艺脱氮负荷的步骤，而PN出水中基质组成（即NO₂^--N/NH₄⁺-N之比和NO₃^--N浓度）是控制工艺脱氮效果的环节.基于上述结果，提出两级式PN-ANAMMOX工艺主流条件下实现高效能脱氮的分级分离式调控策略. 英文摘要 A two-stage partial nitritation (PN)-ANAMMOX process was successfully carried out for low-strength NH₄⁺-N (50 mg·L^-1) wastewater treatment at ambient/low temperatures. The results show that an average total nitrogen removal rate and removal efficiency above 0.6 kg·(m³·d)^-1and 80% could be maintained, respectively, at temperatures between 20℃ and 14℃. The two-stage PN-ANAMMOX process was successful both under NO₂^--N-limited and NH₄⁺-N-limited conditions. When the two-stage PN-ANAMMOX process was operated under NH₄⁺-N-limited conditions, the "limit of technology" for nitrogen removal (TN<3 mg·L^-1) could be easily achieved by following anoxic denitrification. Lowering the temperature to 12℃ resulted in the reduction of the total nitrogen removal rate to~0.5 kg·(m³·d)^-1. Due to the low temperature, the anammox reaction became the rate-limiting step for nitrogen removal, while the PN reaction was not impacted. In the temperature range of 10-20℃, the activity-temperature coefficients (θ) of the PN granules and ANAMMOX sludge were 1.056 and 1.172, respectively, suggesting that the anammox bacteria have a higher temperature sensitivity than the ammonium oxidizing bacteria (AOB). Overall, the results clearly indicate that the nitrogen removal loading rate of the two-stage PN-ANAMMOX process is mainly controlled by the activity and quantity of anammox biomass. In contrast, the process nitrogen removal efficiency mainly depends on the performance of the first-stage PN (i.e., effluent NO₂^--N/NH₄⁺-N ratio and NO₃^--N concentration) under a constant nitrogen removal loading rate (no overload). Based on these results, a hierarchically separate control strategy was proposed to obtain a high-rate nitrogen removal during the two-stage mainstream PN-ANAMMOX process.

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