混合液回流比对多点进水新型A/O/A/A/O泥膜耦合工艺脱氮除磷的影响  

Influence of mixed liquid reflux ratio on a new multiple-inflow A/O/A/A/O sludge-biofilm coupling process for denitrification and phosphorus removal

作　　者：郑俊田 郑俊 程洛闻 张德伟 赵梦轲 王梦琳 张诗华 丁磊 ZHENG Juntian;ZHENG Jun;CHENG Luowen;ZHANG Dewei;ZHAO Mengke;WANG Menglin;ZHANG Shihua;DING Lei(School of Energy and Enviroment,Anhui University of Technology,Ma′anshan 243002,China;Anhui Huaqi Environmental Protection Technology Co.Ltd.,Ma′anshan 243061,China;BAF Engineering Technology Research Center of Anhui Province,Ma′anshan 243061,China)

机构地区：[1]安徽工业大学能源与环境学院,马鞍山243002 [2]安徽华骐环保科技股份有限公司,马鞍山243061 [3]安徽省曝气生物滤池(BAF)工程技术研究中心,马鞍山243061

出　　处：《环境工程学报》2021年第5期1744-1752,共9页Chinese Journal of Environmental Engineering

摘　　要：针对中国南方城镇低碳氮比(低C/N)生活污水的脱氮除磷问题,开发并设计了新型多点进水A1/O2/A3/A4/O5泥膜耦合工艺及中试装置。在进水点1和进水点2的进水流量比为4:6的条件下,通过改变混合液回流比,研究了其对系统中有机物、氮、磷的去除影响及氮素的转化规律。结果表明:当平均进水低C/N比为2.09,混合液回流比为300%时,出水中COD、NH4+-N、TN、TP的平均值分别为23.45、0.80、12.41、0.36 mg·L^(-1),平均去除率分别为86.88%、98.25%、77.68%、90.31%;相对于分段进水A/O/A/A/O泥膜耦合工艺,增加混合液回流比后系统对TN的去除率由68.28%增加到77.68%;对TP的去除率由75.22%增加到90.31%。本系统对于低碳氮比污水处理具有明显的脱氮除磷效果优势,解决了低碳氮比污水生物处理过程中磷出水较难低于0.5 mg·L^(-1)的难题。A new multiple-inflow A1/O2/A3/A4/O5 sludge-biofilm coupling process and its pilot facility were developed and designed for the denitrification and phosphorus removal from domestic sewage with low C/N ratio in the towns of South China.At the inlet flow ratio of 4:6 between inlet point 1 and inlet point 2,the influence of the mixed liquid reflux ratio on the removal of organic matter,nitrogen and phosphorus in the system and the rule of nitrogen transformation were studied.The results showed that when the average C/N ratio was 2.09 and the mixed refluent ratio was 300%,the average values of COD,N H4+-N,TN and TP in the effluent were 23.45,0.80,12.41 and 0.36 mg·L^(-1),respectively,and the corresponding average removal rates were86.88%,98.25%,77.68%and 90.31%,respectively.Compared with multi-stage inflow A/O/A/A/O sludgebiofilm coupling process,the TN removal rate of the system increased from 68.28%to 77.68%and the TP removal rate increased from 75.22%to 90.31%after the mixed liquid reflux increased.This system has significant advantages in denitrification and phosphorus removal from low carbon nitrogen ratio sewage,and solves the problem that the phosphorus effluent is difficult to be below 0.5 mg/L in the biological treatment of low carbon and nitrogen ratio sewage.

关 键 词：多点进水 混合液回流比 A1/O2/A3/A4/O5泥膜耦合工艺 低碳氮比 城镇污水 脱氮除磷 

分 类 号：X703[环境科学与工程—环境工程]