环境工程学报2018，Vol.12Issue(2)：630-637,8.DOI:10.12030/j.cjee.201708105
氧化-铁盐絮凝联合对调理改善污泥脱水性能的影响
Combined effects of oxidation and iron coagulation on sludge co-conditioning and dehydration performance
摘要
Abstract
This study investigated the combined effects of chlorination with subsequent coagulation by Fe(Ⅱ) and Fe(Ⅲ) on the co-conditioning and dewatering of concentrated municipal sludge.Results indicate that preoxidation by chlorine may improve sludge dewatering,and chlorine at 200 mg · g-1 contributed to the decrease of the specific resistance to filtration (SRF) from 5.3 × 109 m · kg-1 to 2.0 × 109 m · kg-1.Fe(Ⅲ) at 30 mg · g-1 may significantly decrease the SRF from 3.5 × 109 m · kg-1 to 1.6 × 109 m · kg-1,whereas Fe(Ⅱ) shows little effect on sludge dewatering.The introduction of chlorine prior to Fe(Ⅲ) and Fe(Ⅱ) may further improve their positive effects,and SRF are respectively decreased by 40.3％ and 78.3％ as compared to that without prechlorination.Chlorination of sludge damages its extracellular polymeric substances (EPS) and the release of protein and polysaccharide in the sludge occurs thereafter,and the content of released protein and polysaccharide is observed to be positively correlated with the dewatering efficiency.The combined co-conditioning by chlorine and iron salts may improve the dewatering efficiency,and the synergistic effects between oxidation and coagulation are the main mechanisms.关键词
二价铁/三价铁/氯化剂/污泥比阻/脱水性能Key words
ferrous salt/ferric salt/chlorination/specific resistance to filtration/dewatering performance分类
资源环境引用本文复制引用
骆丽宁,王丽娟,杨敏,李锟,刘锐平,肖亚楠..氧化-铁盐絮凝联合对调理改善污泥脱水性能的影响[J].环境工程学报,2018,12(2):630-637,8.基金项目
国家自然科学基金优秀青年基金资助项目(51422813) （51422813）
