化工学报2011，Vol.62Issue(5)：1402-1407,6.DOI:10.3969/j.issn.0438-1157.2011.05.033
CAST工艺改良对系统强化除磷性能的影响
Phosphorus removal performance of modified CAST process
摘要
Abstract
The first level A standard of the sewage discharge for phosphorus removal could not reach when only biological method is employed, such as the traditional CAST (cyclic activated sludge technology)process that has been widely used in municipal wastewater treatment plants. A modification for the traditional CAST process was made by introducing an independent stirring phase in the main reactor zone. The modified process has been demonstrated in a full-scale wastewater treatment plant. To optimize the metabolic environment for polyphosphate bacteria and to increase its competition ability, gradually the aeration time was shortened and the anoxic stirring time extended by two stage experiment. For the modified CAST process the efficiency of phosphorus removal is 89.1％, 22％ higher than non-modified CAST process, and the first level A standard of the sewage discharge could be steadily reached for the effluent TP. The results of static tests showed that the modification of process can increase the proportion of denitrifying polyphosphate accumulating organisms, and that the removal of 1 mg·L-1 PO34- -P need consume of 1. 67 mg·L-1 NO3- -N. So, the denitrifying performance was also improved, and the concentration of NH4+-N and TN in effluent both could meet the first level A standard with 10.4％ energy saved.关键词
CAST/生物除磷/污水处理厂/一级A标准/节能降耗/反硝化除磷Key words
CAST/ biological phosphorus removal/ wastewater treatment plant/ the first level A standard/energy conservation/ denitrifying polyphosphate removal分类
资源环境引用本文复制引用
徐立杰,王淑莹,甘冠雄,陈祥东,彭永臻..CAST工艺改良对系统强化除磷性能的影响[J].化工学报,2011,62(5):1402-1407,6.基金项目
"十一五"国家科技支撑计划重点项目(2006BAC19803). （2006BAC19803）
