生物絮凝-AAAO中试系统污染物去除特性及反硝化除磷菌的培养

为降低污水处理成本并实现出水稳定达标，采用中试规模生物絮凝-AAAO工艺处理城镇生活污水，并模拟生物絮凝污泥厌氧消化所产生的碳源，用于强化反硝化除磷菌(DPAO)驯化效果。实验结果表明：生物絮凝系统抗冲击负荷能力较强，化学需氧量(COD)、总氮(TN)和总磷(TP)平均去除率可达67.23%、27%与68.93%。将模拟厌氧消化后产生的碳源投加至厌氧池促进DPAO的驯化后，AAAO系统对COD、TN和TP去除率分别提升31.53%、37.67%和26.37%，反硝化吸磷率最高可达62.97%，二沉池出水COD、TN均满足一级A出水标准，TP可低于0.30 mg·L⁻¹。生物絮凝-AAAO工艺脱氮除磷效果较好，可为污水处理厂节能降耗运行奠定基础并有望得到广泛应用。

Contaminant removal characteristics of bioflocculation-AAAO pilot system and cultivation of denitrifying polyphosphate-accumulating organisms

In order to reduce the operation cost and achieve good effluent, the pilot-scale bioflocculation-anoxic-anaerobic-anoxic-oxic(AAAO) process was established to cultivate denitrifying polyphosphate-accumulating organisms(DPAOs) and further enhance phosphorus removal by adding simulative carbon source from bioflocculation sludge through anaerobic digestion(AD) process. The experimental results showed that the bioflocculation process presented good resistance to shock loads, and the average removal rates of chemical oxygen demand(COD), total nitrogen(TN) and total phosphorus(TP) were 67.23%, 27% and 68.93%, respectively. After dosing carbon source produced from simulative anaerobic digestion to anaerobic tank, and DPAO acclimation was promoted, then the COD, TN and TP removal rates of AAAO system increased by 31.53%, 37.67% and 26.37%, respectively. In addition, the maximum phosphorus uptake rate during denitrification process was up to 62.97%, and the TN and COD in effluent of secondary tank could meet the Class A of National Effluent Standard, the effluent TP even decreased to below 0.30 mg·L−1. The pilot-scale bioflocculation-AAAO process demonstrated a good nitrogen and phosphorus removal capacity, which can lay a foundation for energy-saving and cost-reducing operation of wastewater treatment plants, and is expected to be widely promoted.