FENG Hong-li,ZHAO Meng-yue,DING Shu-zhe.Optimal Control of Biological Nitrogen Removal in A2/O Process of WWTP[J].China Water & Wastewater,2021,37(6):102-106.
城市污水廠A2/O工藝生物脫氮過程優(yōu)化控制
- Title:
- Optimal Control of Biological Nitrogen Removal in A2/O Process of WWTP
- Keywords:
- A2/O process; biological nitrogen removal; aeration rate; internal reflux ratio; carbon source; optimal control
摘要:
針對城市污水廠運行過程中曝氣風機能耗高、外加碳源藥耗高的問題，將A2/O工藝中好氧池沿程氨氮濃度、進出水總氮濃度、缺氧池末端出水的硝酸鹽氮濃度和COD濃度作為分析對象，進行A2/O生物脫氮過程的優(yōu)化控制。首先根據(jù)好氧池沿程氨氮濃度調(diào)節(jié)好氧池的曝氣量，從而進行硝化過程的優(yōu)化控制。然后根據(jù)進、出水總氮濃度調(diào)節(jié)系統(tǒng)的內(nèi)回流比，根據(jù)缺氧池末端出水的硝酸鹽氮濃度和COD濃度調(diào)節(jié)缺氧池外部的碳源投加量，從而進行反硝化過程的優(yōu)化控制。結(jié)果表明，采取上述生物脫氮過程的優(yōu)化控制策略，使得某5×104 m3/d的城市污水處理廠在實際運行中曝氣量降低了50%，碳源投加量降低了74%，出水水質(zhì)仍能達到排放標準。
Abstract:- In view of the problems such as high aeration consumption and high consumption of external carbon source in the operation process of a municipal wastewater treatment plant (WWTP), the ammonia nitrogen concentration along the aerobic tank, the influent and effluent total nitrogen concentrations, nitrate nitrogen and COD concentrations at the end of the anoxic tank in the A2/O process were analyzed as the objects to optimize its biological nitrogen removal process. Firstly, the aeration rate of the aerobic tank was adjusted according to the ammonia nitrogen concentrations along the aerobic tank to optimize the nitrification process. Then the internal reflux ratio was adjusted according to influent and effluent total nitrogen concentrations, and the external carbon source dosage is adjusted according to the nitrate nitrogen and COD concentrations at the end of the anoxic tank. The results indicated that taking the optimal control strategy of biological nitrogen removal process mentioned above, the aeration rate of a 5×104 m3/d municipal WWTP was reduced by 50% during actual operation, and the external carbon source dosage was reduced by 74%, which can still reach the discharge standards.
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