Comparison of Mg^(2+)- and Ca^(2+)-enhancing anaerobic granulation in an expanded granular sludge-bed reactor

作     者：CAO XiaoLei SHENG YuXing CAO HongBin ZHANG Yi 

作者机构：National Key Laboratory of Biochemical Engineering and Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Graduate University of Chinese Academy of Sciences 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2014年第57卷第11期

页      面：1596-1601页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China(21307134) the National High-Tech R&D Program of China(2011AA060702 and 2011AA060904) the Open Funding Project of the National Key Laboratory of Biochemical Engineering(2012KF-07) 

主　　题：anaerobic granulation Ca2＋ augmentation EPS Mg2＋ augmentation 

摘      要：The mechanisms responsible for the fast granulation of anaerobic sludge caused by Mg2+ and Ca2+ addition was examined in four lab-scale expanded granular sludge bed(EGSB) reactors. Results indicated that both Mg2+ and Ca2+ accelerated the sludge-granulation process and increased the amount of polysaccharides and proteins in the sludge. Energy dispersive x-ray spectrometry(EDX) analysis revealed that, in a mature granule, both Mg2+ and Ca2+ composed as phosphate and calcium was distributed primarily in the periphery of the granule, while magnesium distributed mainly in the interior. The addition of Mg2+ was more favorable for the nuclei formation, whereas the addition of Ca2+ was more favorable for subgranule growth and maintaining the granules rigid structure. Results showed that the addition of Mg2+ in the nuclei formation stage and Ca2+ in the granule-growth stage accelerated granulation more than adding only one of them in the granulation process.