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Removal of total cyanide in coking wastewater during a coagulation process: Significance of organic polymers
Alternative TitleJ. Environ. Sci.
Shen, Jian1,3; Zhao, He1,2; Cao, Hongbin1; Zhang, Yi2; Chen, Yongsheng4
2014-02-01
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
ISSN1001-0742
Volume26Issue:2Pages:231-239
AbstractWhether a cationic organic polymer can remove more total cyanide (TCN) than a non-ionic organic polymer during the same flocculation system has not been reported previously. In this study, the effects of organic polymers with different charge density on the removal mechanisms of TCN in coking wastewater are investigated by polyferric sulfate (PFS) with a cationic organic polymer (PFS-C) or a non-ionic polymer (PFS-N). The coagulation experiments results show that residual concentrations of TCN (Fe(CN)(6)(3-)) after PFS-C flocculation (TCN < 0.2 mg/L) are much lower than that after PFS-N precipitation. This can be attributed to the different TCN removal mechanisms of the individual organic polymers. To investigate the roles of organic polymers, physical and structural characteristics of the flocs are analyzed by FT-IR, XPS, TEM and XRD. Owing to the presence of N+ in PFS-C, Fe(CN)(6)(3-) and negative flocs (Fe(CN)(6)(3-) adsorbed on ferric hydroxides) can be removed via charge neutralization and electrostatic patch flocculation by the cationic organic polymer. However, non-ionic N in PFS-N barely reacts with cyanides through sweeping or bridging, which indicates that the non-ionic polymer has little influence on TCN removal.; Whether a cationic organic polymer can remove more total cyanide (TCN) than a non-ionic organic polymer during the same flocculation system has not been reported previously. In this study, the effects of organic polymers with different charge density on the removal mechanisms of TCN in coking wastewater are investigated by polyferric sulfate (PFS) with a cationic organic polymer (PFS-C) or a non-ionic polymer (PFS-N). The coagulation experiments results show that residual concentrations of TCN (Fe(CN)(6)(3-)) after PFS-C flocculation (TCN < 0.2 mg/L) are much lower than that after PFS-N precipitation. This can be attributed to the different TCN removal mechanisms of the individual organic polymers. To investigate the roles of organic polymers, physical and structural characteristics of the flocs are analyzed by FT-IR, XPS, TEM and XRD. Owing to the presence of N+ in PFS-C, Fe(CN)(6)(3-) and negative flocs (Fe(CN)(6)(3-) adsorbed on ferric hydroxides) can be removed via charge neutralization and electrostatic patch flocculation by the cationic organic polymer. However, non-ionic N in PFS-N barely reacts with cyanides through sweeping or bridging, which indicates that the non-ionic polymer has little influence on TCN removal.
KeywordCationic Polymer Total Cyanide Removal Coking Wastewater Coagulation
SubtypeArticle
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
DOI10.1016/S1001-0742(13)60512-4
URL查看原文
Indexed BySCI
Language英语
WOS KeywordDESTRUCTION ; DEGRADATION ; MECHANISMS ; MEMBRANE ; STRENGTH ; SULFATE ; SURFACE ; OZONE ; AIDS ; SOL
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000331781900001
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/8191
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Res Ctr Proc Pollut Control, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA
Recommended Citation
GB/T 7714
Shen, Jian,Zhao, He,Cao, Hongbin,et al. Removal of total cyanide in coking wastewater during a coagulation process: Significance of organic polymers[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2014,26(2):231-239.
APA Shen, Jian,Zhao, He,Cao, Hongbin,Zhang, Yi,&Chen, Yongsheng.(2014).Removal of total cyanide in coking wastewater during a coagulation process: Significance of organic polymers.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,26(2),231-239.
MLA Shen, Jian,et al."Removal of total cyanide in coking wastewater during a coagulation process: Significance of organic polymers".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 26.2(2014):231-239.
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