天津津南污泥处理厂两段式PN/A工艺处理污泥脱水液的成功启动与运行分析

Successful start-up and operation analysis of the two-stage PN/A process for the treatment of reject water in Tianjin Jinnan Plant

污泥脱水液的经济高效脱氮处理已成为污水处理中的重要环节。依托天津津南污泥处理厂采用两段式部分亚硝化/厌氧氨氧化(PN/A)脱氮工艺处理污泥脱水液,在35℃下,对工程规模的工艺启动和稳定运行特性进行了研究。结果表明:接种活性污泥可成功启动部分亚硝化(PN)反应器,PN反应器出水NO_(2)^(-)-N/NH_(4)^(+)-N为1.1时,可实现anammox系统的快速启动与稳运行;出水NO_(2)^(-)-N/NH_(4)^(+)-N过高会造成anammox系统的不稳定行和厌氧氨氧化菌的抑制;anammox系统在进水TN为(821±102)mg·L^(-1),氮负荷为0.16 g·(L·d)^(-1)的条件下可实现86.0%的稳定脱氮率;出水NO_(2)^(-)-N为35 mg·L^(-1)可作为anammox系统稳定运行的调控依据。以上研究结果可为两段式PN/A工艺在污泥脱水液脱氮处理的工程应用提供参考。

Economical and efficient denitrification of reject water from sludge dewatering has become an urgent need for wastewater treatment.In this paper,a full scale two-stage PN/A(partial nitritation/anammox)nitrogen removal process was used to treat reject water in the Tianjin Jinan sludge treatment plant,and its startup and stable operation characteristics were investigated at 35℃.Results showed that the activated sludge inoculation could successfully start up the partial nitrosation(PN)reactor,and a PN reactor effluen nitrite/ammonium ratio of 1.1 could achieve rapid start-up and stable operation of the Anammox system.High effluent nitrite/ammonium ratio can cause instability and inhibition of the Anammox system.The Anammox system achieved a stable nitrogen removal rate of 86.0%with the influent total nitrogen(TN)concentration being(821±102)mg·L^(-1) and the nitrogen load being 0.16 g·(L·d)^(-1).The effluent nitrite of 35 mg·L^(-1) can be used as a basis for the regulation of stable operation of the Anammox system.This study can provide a reference for the engineering application of the two-stage PN/A process in reject water nitrogen removal treatment.