以污泥发酵液与尾水混合液为补给碳源的A^2/O污染物去除特性  

Characteristics of Nutrient Removal in a Pilot-scale A^2/O with Mixture of Sludge Fermentation Liquor and Tail Water as External Carbon Source

作　　者：荣懿 邵劲博 于优城 石烜[1] 金鹏康[1] RONG Yi;SHAO Jin-bo;YU You-cheng;SHI Xuan;JIN Peng-kang(School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi'an 710055,China;Shaanxi Urstar Environmental Technology Co.,Ltd.,Baoji 721300,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]陕西优斯达环境科技有限公司,宝鸡721300

出　　处：《环境科学》2020年第11期5089-5096,共8页Environmental Science

基　　金：国家重点研发计划项目(2016YFC0400701);陕西省科技统筹创新工程计划项目(2016TZC-S-19-3);陕西省重点科技创新团队项目(2013KCT-13)。

摘　　要：针对我国农村地区污水量波动和断流的排放特性,提出了一种在断流时段补给污水处理系统自身产出的尾水与污泥发酵液混合液的运行模式,以中试A^2/O为对象,研究了系统在该运行模式下的污染物去除特性,以期为今后我国农村地区污水处理装置的设计和运行提供新的思路.结果表明,尾水与发酵液以12∶1的比例混合后作为碳源与原水相比具有更好的反硝化和释/吸磷特性,具有强化脱氮除磷的功能;以尾水与发酵液混合液在断流时段作为补给碳源可改善系统对TN和TP的去除效率,其平均去除率分别由69.27%和86.94%提升到73.34%和89.94%,相应地平均出水浓度分别由15.77 mg·L^-1和0.80 mg·L^-1降低到13.76 mg·L^-1和0.64 mg·L^-1.16S rRNA基因测序结果表明,随着实验的进行,系统中5种常见的水解酸化菌属、6种聚磷菌属和4种反硝化菌属的相对丰度得到提升;通过对系统活性污泥性状的长期监测可以看出,以尾水与发酵液混合液在断流时段作为补给碳源会恶化系统活性污泥的沉降性能,系统活性污泥的平均SVI由阶段Ⅰ的106 mL·g-1上升至阶段Ⅱ的131 mL·g-1,然而这种恶化程度并不会对系统的污泥活性和污染物去除性能造成不利影响,在整个实验过程中系统均未出现污泥膨胀的现象.To resolve the issue of sewage fluctuation and discontinuity in a rural district of China,a new operation mode of replenishing the mixture of fermentation liquor and tail water during the off-flow period was proposed,and the nutrient removal performance of a pilot-scale A^2/O system with this operation mode was investigated.The results of beaker experiments found that the mixture of tail water and fermentation liquor at a ratio of 12∶1 had better denitrification and phosphorus release/absorption characteristics than the raw water,and theoretically had the function of enhancing denitrification and phosphorus removal performances.The results of a 97 d pilot test showed that the removal efficiency of TN and TP was improved after the system was adjusted from the constant flow mode to this new operation mode,and the average removal rate of TN and TP increased from 69.27%and 86.94%to 73.34%and 89.94%,respectively.The corresponding average effluent concentration decreased from 15.77 mg·L^-1and 0.80 mg·L^-1 to 13.76 mg·L^-1and 0.64 mg·L^-1.The sequencing results of the 16 S rRNA gene showed that this new operation mode was beneficial to the enrichment of five common hydrolytic acidizing bacteria genera,six phosphorus-accumulating organisms genera,and four denitrifying bacteria genera.This was also the main reason for the improved nutrient removal performance.According to the long-term monitoring of the characteristics of activated sludge,this new operating mode will degrade the sedimentation performance of activated sludge in the system,and the average SVI increased from 106 mL·g-1to 131 mL·g-1.However,this degree of deterioration did not adversely affect the sludge activity and nutrients removal performance of the system,and there was no sludge bulking in the entire experiment.The results of this study have shown that the A^2/O system can maintain and improve the performance of nutrients removal by replenishing the mixture of tail water and sludge fermentation liquor when the flow is cut off.This will provide ne

关 键 词：A^2/O 农村生活污水 间歇断流 发酵液与尾水 污染物去除 

分 类 号：X703.1[环境科学与工程—环境工程]