As the pipe network construction time is not synchronous with sewage treatment plant's,Guangzhou new sewage treatment plant will be in low organic loading operation situation 30％～54％.And commonly,the influent C/N ratio is low in Guangzhou municipal sewage treat-ment plants,the average C/N ratio in 2020 is 4.35(COD/TN is 7.70).Under the influence of two sides,the effluent total nitrogen of the sewage treatment plant is so unstable that appears higher TN or even exceed the standard frequently.In order to stabilize the effluent total nitrogen,many plants usually add carbon sources to strengthen denitrification,but this way will increase the oper-ating cost.So,the author who combined Longgui sewage treatment plant's low organic loading characters with plant present situation such as making full use of the idle production line,refers to the SBR process operation mode and finally develops an alternating production mode.The new mode can achieve the purpose of deep nitrogen removal through the biochemical tank series opera-tion.When it is put into operation,the effluent total nitrogen of sewage treatment plant is stable,the average value of total effluent nitrogen is 6.50 mg/L,the total nitrogen removal rate was in-creased to 78.2％,and the sodium acetate consumption per ton is 0.27 tons per ton.Compared with the traditional operation mode,the decrease is about 25％.
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