struvite precipitation for ammonia nitrogen removal in 7-aminocephalosporanic acid wastewater鸟粪石沉淀烷酸废水中氨氮去除.pdf

Molecules 2012, 17, 2126-2139; doi:10.3390/molecule OPEN ACCESS molecules ISSN 1420-3049 /journal/molecules Article Struvite Precipitation for Ammonia Nitrogen Removal in 7-Aminocephalosporanic Acid Wastewater Zaixing Li 1,2, Xuguang Ren 1, Jiane Zuo 2, Yanfang Liu 1, Erhong Duan 1,*, Jingliang Yang 1,*, 3 3 Ping Chen and Yongjun Wang 1 School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China; E-Mails: Li_zaixing@163.com (Z.L.); 275716074@ (X.R.); liuyanfang1984@163.com (Y.L.) 2 Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China; E-Mail: jiane.zuo@ 3 North China Pharmaceutical Company, Shijiazhuang 050015, China; E-Mails: chenping@ (P.C.); wyjkx@163.com (Y.W.) * Authors to whom correspondence should be addressed; E-Mails: deh@ (E.D.); yangjingliang@ (J.Y.); Tel.: +86-311-8863-2210; Fax: +86-311-8863-2210. Received: 4 January 2012; in revised form: 14 February 2012 / Accepted: 15 February 2012 / Published: 21 February 2012 Abstract: 7-Aminocephalosporanic acid wastewater usually contains high concentrations of ammonium (NH4+-N), which is known to inhibit nitrification during biological treatment processes. Chemical precipitation is a useful technology to remove ammonium from wastewater. In this paper, the removal of ammonium from 7-aminocephalosporanic acid wastewater was studied. The optimum pH, molar ratio, and various chemical compos