The invention provides a method for regulating and controlling
nitrogen proportion of partial
nitrosation effluent of low-
ammonia-
nitrogen continuous stirred-tank reactor (CSTR) at normal temperature and belongs to the field of municipal
wastewater treatment and recycling. The starting is performed in a four-stage mode, and 80%-100% of
ammoxidation load in the low-
ammonia-
nitrogen operation period of
sequencing batch reactor activated sludge process (SBR) serves as initial
ammoxidation load of the CSTR to confirm
hydraulic retention time (HRT) of the CSTR. DO / ALR serves as an iconic parameter for maintaining a
nitrosation system, and a value of the iconic parameter is recommended to be not greater than 1.0 mgO2 / gNd and is regarded as the regulating and controlling standard of the DO and the HRT. First, the HRT is constant, the DO is controlled singly, if the proportion is not reached or the
ammoxidation load is not enough, the DO and the HRT can be regulated and controlled synchronously. The NO2--N / NH4+-N and
ammonia-nitrogen
oxidation rate (a) /
nitrite nitrogen generating rate (b) and
nitrite nitrogen generating rate (b) /
nitrate nitrogen generating rate (c) of the
effluent are compared. If an average value of the proportions of the
effluent under the different working conditions is in a range of 1-1.32:1, when b / a is greater than 0.9 and more approximates to 1.0, b / c is greater, and the working condition is more suitable for long-term operation of the
system. The NO2--N / NH4+-N of the effluent of the CSTR is guaranteed to be in a range of 1-1.32:1 so as to meet the water feeding requirement of an anaerobic oxidation technology.