化工学报2012，Vol.63Issue(4)：1249-1257,9.DOI:10.3969/j.issn.0438-1157.2012.04.036
流量分配比对改良A/O分段进水脱氮除磷特性的影响
Effect of inflow distribution ratio on N and P removal in modified A/O step-feed process
摘要
Abstract
Concentration of pollutants especially influent C/N in municipal wastewater is higher in the northern China than in the southern China. Therefore, it is difficult to keep efficient and stable removal of nitrogen and phosphorus by using conventional biological treatment processes because of the limitations and typical water quality in the southern China. In this study, a modified A/O step-feed process was operated at lab-scale to deal with the weak urban sewage and to remove simultaneously biological nitrogen (N) and phosphorus (P). Under the controlled conditions: influent COD/TN 5. 16, HRT 8. 7 h, SRT 15 d, MLSS 5. 66 g ? L"1 , sludge reflux ratio 75% , the volume ratio of anaerobic/anoxic/aerobic 4 : 8 : 10, DO 1. 0-1. 5 mg ? L"1 in three aerobic zones, continuous operation with six inflow distribution ratio 150 d, the optimal flow distribution ratio obtained was 20% : 35% : 35% ! 10% , and the values of COD, ammonia nitrogen, total nitrogen, total phosphorus in effluent were 33. 05 mg ? L"1 , 0. 58 mg ? L~l , 9. 26 mg ? L^1 and 0. 46 mg ? L"1 , respectively. These values were up to Grade A discharging standardof pollutants for municipal wastewater treatment plant (WWTP)(GB 18918-2002). The majority of COD in raw water was used as carbon source of anaerobic phosphorus release and denitrification processes, and more than 74% of carbon sources was utilized effectively. At the same time, the experiment also found that collaborative control of DO and ORP are not only useful for anaerobic phosphorus release but also for anoxic denitrification and aerobic nitrification.关键词
改良A/O分段进水/脱氮除磷/低浓度废水/进水流量分配比/过程控制策略Key words
modified A/O step-feed process/ nitrogen and phosphorus removal/ weak wastewater/ inflow distribution ratio/ process control strategy分类
资源环境引用本文复制引用
曹贵华,王淑莹,彭永臻,苗志加..流量分配比对改良A/O分段进水脱氮除磷特性的影响[J].化工学报,2012,63(4):1249-1257,9.基金项目
"十一五"国家科技支撑计划重点项目(2009BAC57B01). （2009BAC57B01）
