TANG Xia,LI Jiang-peng,SHEN Yun,et al.A Pilot Test on Upgrading and Reconstruction of Municipal Wastewater Treatment Plant Based on A2O-MBBR Process[J].China Water & Wastewater,2021,37(11):52-57.
基于A2O—MBBR工艺的污水厂提标改造中试研究
- Title:
- A Pilot Test on Upgrading and Reconstruction of Municipal Wastewater Treatment Plant Based on A2O-MBBR Process
- 关键词:
- 城市污水处理厂; 提标改造; A2O—MBBR工艺; 碳源不足; 负荷冲击
- Keywords:
- municipal wastewater treatment plant; upgrading and reconstruction; A2O-MBBR process; insufficient carbon source; shock load
- 摘要:
- 针对某污水厂进水碳源不足、负荷冲击性强以及占地受限等问题，拟采用A2O—MBBR工艺进行提标改造，并开展中试研究。中试结果表明，在进水平均C/N值＜3的条件下，生化池出水COD、NH3-N、TN、TP平均值分别为14.4、0.24、5.93、0.25 mg/L，TN去除率相比现状污水厂提高了27.2%；在1.4倍水量冲击下，出水COD、NH3-N、TN、TP平均值分别为9.9、0.56、6.17、0.2 mg/L；当垃圾渗滤液投加比为0.1%~0.4%时，出水COD、NH3-N、TN、TP平均浓度分别为18.1、0.57、8.05、0.2 mg/L；悬浮载体上硝化菌群相对丰度为13.32%，反硝化菌群相对丰度为14.29%，硝化菌和反硝化菌同时存在，为同步硝化反硝化的发生提供了微观保证。可见，MBBR工艺可以强化中试系统的脱氮除磷能力，大幅提高系统的抗冲击负荷能力。
- Abstract:
- A wastewater treatment plant has the problems of insufficient carbon source, strong shock load, limited footprint area and so on. A2O-MBBR process was proposed to upgrade the existing process, and a pilot test was carried out. When the average C/N ratio of influent was less than 3, the average concentrations of COD, NH3-N, TN and TP in effluent of the biochemical tank were 14.4 mg/L, 0.24 mg/L, 5.93 mg/L and 0.25 mg/L, respectively, and the TN removal efficiency increased by 27.2% compared with that of the existing process. When the flow rate of the influent increased by 1.4 times, the average values of COD, NH3-N, TN and TP in the effluent were 9.9 mg/L, 0.56 mg/L, 6.17 mg/L and 0.2 mg/L, respectively. When the dosage ratio of landfill leachate was 0.1%-0.4%, the average values of COD, NH3-N, TN and TP in the effluent were 18.1 mg/L, 0.57 mg/L, 8.05 mg/L and 0.2 mg/L, respectively. The relative abundance of nitrifying bacteria and denitrifying bacteria on suspended carriers was 13.32% and 14.29%, respectively. The coexistence of nitrifying bacteria and denitrifying bacteria provided micro-guarantee for the occurrence of simultaneous nitrification and denitrification. Therefore, the MBBR process enhanced the nitrogen and phosphorus removal capacity of the system, and significantly improved shock resistance performance of the system.
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