标题：Influences of D-tyrosine on the stability of activated sludge flocs
作者：Wang, Yi-Fu; Sun, Xue-Fei; Xia, Peng-Fei; Xing, Su-Fang; Song, Chao; Wang, Shu-Guang
作者机构：[Wang, Yi-Fu; Sun, Xue-Fei; Xia, Peng-Fei; Xing, Su-Fang; Song, Chao; Wang, Shu-Guang] Shandong Univ, Sch Environm Sci & Engn, Shandong Prov Key Lab W 更多
通讯作者地址：[Sun, XF]Shandong Univ, Sch Environm Sci & Engn, Shandong Prov Key Lab Water Pollut Control & Reso, 27 Shanda Nanlu, Jinan 250100, Peoples R China.
关键词：Stability; D-Tyrosine; Sludge flocs; Microbial extracellular polymeric; substances (EPS); Surface characteristics
摘要：The sludge floc stability is essential for the solid/liquid separation in biological wastewater treatment. In this study, the effect of an exogenous D-tyrosine on the shear stability and surface characteristics of activated sludge flocs was investigated. Sludge flocs were found to be less stable in the addition of D-tyrosine. D-Tyrosine inhibited the production of extracellular polymeric substances (EPS) especially for the proteins. A high correlation coefficient was observed between the composition of EPS fraction and D-tyrosine content. In addition, the hydrophobicity of sludge flocs was reduced and the zeta potential was more negative with the content of D-tyrosine increased. A linear relationship between the extracellular polymeric substances and surface characteristics for sludge flocs indicated that the inhibited EPS production may be responsible for the instability of sludge upon the addition of D-tyrosine. (C) 2013 Elsevier Ltd. All rights reserved.