王丽娟1,
杨敏2,3,
李锟2,
刘锐平2,
肖亚楠4
1.河北工业大学土木与交通学院,天津300401
2.中国科学院生态环境研究中心,中国科学院饮用水科学与技术重点实验室,北京100085
3.中国科学院大学,北京100049
4.通辽市自来水公司,通辽028000
基金项目: 国家自然科学基金优秀青年基金资助项目(51422813)
Combined effects of oxidation and iron coagulation on sludge co-conditioning and dehydration performance
LUO Lining1,2,,WANG Lijuan1,
YANG Min2,3,
LI Kun2,
LIU Ruiping2,
XIAO Yanan4
1.School of Civil and Transportation, Hebei University of Technology, Tianjin 300401,China
2.Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Tongliao Water Supply Corporation, Tongliao 028000, China
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摘要:实验对比考察了活性氯预氧化与铁盐(Fe(Ⅱ)与Fe(Ⅲ))混凝改善市政污泥脱水性能。结果表明:预氧化可改善污泥脱水效果,氯投量为200 mg·g-1时污泥比阻(specific resistance to filtration,SRF)由5.3×109 m·kg-1降低至2.0×109 m·kg-1,进一增加氯投量,SRF反而升高；单独三价铁盐可明显改善污泥脱水性能,但二价铁效果有限；预氧化之后再投加Fe(Ⅲ)与Fe(Ⅱ),SRF较单独铁盐条件下分别降低40.3%和78.3%。进一步研究证实,预氧化可破坏污泥的胞外聚合物(extracellular polymeric substances,EPS),并导致胞内蛋白质和多糖的释放,且蛋白质和多糖含量与污泥脱水性能呈明显正相关性。活性氯预氧化与铁盐混凝联合调理可明显改善污泥脱水性能,且氧化与混凝的协同作用是其主要机制。
关键词: 二价铁/
三价铁/
氯化剂/
污泥比阻/
脱水性能
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.
Key words:ferrous salt/
ferric salt/
chlorination/
specific resistance to filtration/
dewatering performance.
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氧化-铁盐絮凝联合对调理改善污泥脱水性能的影响
骆丽宁1,2,,王丽娟1,
杨敏2,3,
李锟2,
刘锐平2,
肖亚楠4
1.河北工业大学土木与交通学院,天津300401
2.中国科学院生态环境研究中心,中国科学院饮用水科学与技术重点实验室,北京100085
3.中国科学院大学,北京100049
4.通辽市自来水公司,通辽028000
基金项目: 国家自然科学基金优秀青年基金资助项目(51422813)
关键词: 二价铁/
三价铁/
氯化剂/
污泥比阻/
脱水性能
摘要:实验对比考察了活性氯预氧化与铁盐(Fe(Ⅱ)与Fe(Ⅲ))混凝改善市政污泥脱水性能。结果表明:预氧化可改善污泥脱水效果,氯投量为200 mg·g-1时污泥比阻(specific resistance to filtration,SRF)由5.3×109 m·kg-1降低至2.0×109 m·kg-1,进一增加氯投量,SRF反而升高；单独三价铁盐可明显改善污泥脱水性能,但二价铁效果有限；预氧化之后再投加Fe(Ⅲ)与Fe(Ⅱ),SRF较单独铁盐条件下分别降低40.3%和78.3%。进一步研究证实,预氧化可破坏污泥的胞外聚合物(extracellular polymeric substances,EPS),并导致胞内蛋白质和多糖的释放,且蛋白质和多糖含量与污泥脱水性能呈明显正相关性。活性氯预氧化与铁盐混凝联合调理可明显改善污泥脱水性能,且氧化与混凝的协同作用是其主要机制。
English Abstract
Combined effects of oxidation and iron coagulation on sludge co-conditioning and dehydration performance
LUO Lining1,2,,WANG Lijuan1,
YANG Min2,3,
LI Kun2,
LIU Ruiping2,
XIAO Yanan4
1.School of Civil and Transportation, Hebei University of Technology, Tianjin 300401,China
2.Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Tongliao Water Supply Corporation, Tongliao 028000, China
Keywords: ferrous salt/
ferric salt/
chlorination/
specific resistance to filtration/
dewatering performance
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.
