%0 Journal Article
%T Effects of COD/TN and HRTS on Nutrients Removal by an Alternating Anoxic/Oxic CAST<br>碳氮比及HRTS对交替缺氧/好氧CAST去除营养物的影响
%A WANG Li
%A PENG Yong-zhen
%A MA Juan
%A LIU Yang
%A MA Ning-ping
%A <br>王丽
%A 彭永臻
%A 马娟
%A 刘洋
%A 马宁平
%J 环境科学
%D 2010
%I 
%X The effects of different COD/TN and HRTS (hydraulic retention time of select) on nutrients removal were investigated by using an alternating anoxic/oxic CAST (cyclic activated sludge technology) fed with municipal wastewater. The results showed that various COD/TN and HRTS had a bigger influence on the nitrogen removal efficiency rather than the COD removal efficiency. As the influent C/N ratios were about 2.6 and 3.5, ammonia was removed by 98% and TN removal efficiency was increased from 62.9% to 76.2% and 72.1% to 84.6%, respectively, by increasing the HRTS from 1.8 h to 5 h. When the COD/TN ratio was increased to about 4.4, TN removal efficiency was decreased from 86.3% to 58.2% by enlarging the HRTS, which was due to the incomplete nitrification of ammonia. It was also observed that both of increasing the COD/TN and HRTS could improve the phosphorus removal performance of the system. Furthermore, effluent of CAST reached the demanded A of integrated wastewater discharge standards (GB 18918-2002) when the COD/TN and HRTS were 4.4 and 1.8 h, respectively.
%K COD/TN ratio
%K HRTS
%K alternating anoxic/oxic
%K biological nutrients removal
%K CAST<br>COD/TN比
%K HRTS
%K 交替A/O
%K 脱氮除磷
%K CAST
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=749CEA2F8F7D74F2B02E95F78CD2BC3A&yid=140ECF96957D60B2&vid=4AD960B5AD2D111A&iid=F3090AE9B60B7ED1&sid=4BC5DC3526DFBBB5&eid=9F38CC88C4120BDC&journal_id=0250-3301&journal_name=环境科学&referenced_num=0&reference_num=0