Coagulation behaviors and in-situ flocs characteristics of composite coagulants in cyanide-containing wastewater: Role of cationic polyelectrolyte

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	Coagulation behaviors and in-situ flocs characteristics of composite coagulants in cyanide-containing wastewater: Role of cationic polyelectrolyte
	Shen Jian 1,2; Zhao He 3; Xie YongBing 1; Cao HongBin 1; Zhang Yi 3
刊名	SCIENCE CHINA-CHEMISTRY
	2013-12-01
卷号	56 期号:12 页码:1765-1774
关键词	composite coagulant flocs structure flocculation mechanism cyanide-containing wastewater
英文摘要	In this paper, composite coagulants (PFS, PFSC05, PFSC1 and PFSC5), prepared by mixing polyferric sulfate (PFS) and cationic polyelectrolyte (CP) coagulants with different weight percent (W-p) of CP (W-p = 0%, 0.5%, 1% and 5%, respectively), were adopted to treat cyanide-containing wastewater. PFSC5 exhibited superior coagulation performances at optimal conditions: the removal of total cyanide (TCN) and chemical oxygen demand (COD) was 95%-97% and 50%-55%, respectively. The effects of CP on the properties and structure of flocs were investigated by laser diffraction instrument and small-angle laser light scattering (SALLS), respectively. The results show that the flocs of PFSC5 have higher growth rate, higher strength factor and lower recovery factor than other flocs. They are also much denser and more uniform owing to the higher fractal dimension (D-f) and less microflocs (10-100 mu m). Furthermore, the dense structure of the PFSC5 flocs can be restored after shear and is more resistant to hydraulic conditions. Particularly, detailed morphology evolution of the flocs was in-situ detected by on-line particle imaging. Due to strong ionic strength in wastewater, the CP in PFSC5 plays a significant role of adsorption, while the main mechanism of CP is electrostatic patch aggregation during the PFSC05 systems.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Multidisciplinary
研究领域[WOS]	Chemistry
关键词[WOS]	FLOCCULATION PROCESSES ; PARTICLE-SIZE ; REMOVAL ; POLYMER ; SULFATE ; BREAKAGE ; LATEX
收录类别	SCI
语种	英语
WOS记录号	WOS:000328211300012
公开日期	2015-05-27
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/13432]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Chinese Acad Sci, Res Ctr Proc Pollut Control, Inst Proc Engn, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Key Lab Green Proc & Engn, Inst Proc Engn, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Shen Jian,Zhao He,Xie YongBing,et al. Coagulation behaviors and in-situ flocs characteristics of composite coagulants in cyanide-containing wastewater: Role of cationic polyelectrolyte[J]. SCIENCE CHINA-CHEMISTRY,2013,56(12):1765-1774.
APA	Shen Jian,Zhao He,Xie YongBing,Cao HongBin,&Zhang Yi.(2013).Coagulation behaviors and in-situ flocs characteristics of composite coagulants in cyanide-containing wastewater: Role of cationic polyelectrolyte.SCIENCE CHINA-CHEMISTRY,56(12),1765-1774.
MLA	Shen Jian,et al."Coagulation behaviors and in-situ flocs characteristics of composite coagulants in cyanide-containing wastewater: Role of cationic polyelectrolyte".SCIENCE CHINA-CHEMISTRY 56.12(2013):1765-1774.