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Coagulation behaviors and in-situ flocs characteristics of composite coagulants in cyanide-containing wastewater: Role of cationic polyelectrolyte
Shen Jian1,2; Zhao He3; Xie YongBing1; Cao HongBin1; Zhang Yi3
2013-12-01
Source PublicationSCIENCE CHINA-CHEMISTRY
Volume56Issue:12Pages:1765-1774
AbstractIn 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.
KeywordComposite Coagulant Flocs Structure Flocculation Mechanism Cyanide-containing Wastewater
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Language英语
WOS KeywordFLOCCULATION PROCESSES ; PARTICLE-SIZE ; REMOVAL ; POLYMER ; SULFATE ; BREAKAGE ; LATEX
WOS Research AreaChemistry
WOS SubjectChemistry, Multidisciplinary
WOS IDWOS:000328211300012
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/13432
Collection研究所(批量导入)
Affiliation1.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
Recommended Citation
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.
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