范毅1,
桂昕1,
黄川1,
王雅洁1,
张润宇2,
朱四喜1
1.贵州民族大学生态环境工程学院,贵阳 550025
2.中国科学院地球化学研究所,贵阳 550002
基金项目: 贵州省科技厅-贵州民族大学联合基金项目(黔科合LH字[2014]7383号)
贵州省科技厅基础研究项目(黔科合基础[2016]1071)
贵州民族大学引进人才项目(15XRY010)
Effect of Al2(SO4)3 and FeCl3 coagulation on removal of dissolved organic matter and trihalomethanes formation potential control in Hongfeng lake
WANG Zhikang1,,FAN Yi1,
GUI Xin1,
HUANG Chuan1,
WANG Yajie1,
ZHANG Runyu2,
ZHU Sixi1
1.College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
2.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
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摘要:以三价阳离子(Al2(SO4)3和FeCl3)为混凝剂,在不同的投加量和水力条件下对贵阳市红枫湖取水口处溶解性有机质(DOM)的去除和卤代烃(THMs)生成势控制变化趋势进行研究。实验结果表明,在不同的混凝条件下,对DOM的去除率在60%左右,随着快速搅拌速率的增加,去除率略有提高;UV254的去除率为85%左右,不同的混凝剂投加量和水力条件对其影响不大。混凝前后DOM的THM生成势降低约60%,二氯一溴甲烷(CHCl2Br)和一氯二溴甲烷(CHClBr2)占THMs的80%以上；对于不同的混凝剂类型,投加量和水力条件均对THMs生成势变化没有明显差异。三维荧光光谱(3D-EEM)结果表明,DOM中腐殖酸部分在混凝过程中有较大去除,红外光谱(FTIR)验证了混凝去除的基团主要为羰基(CO)的类共轭结构。而在强化混凝过程中没有得到较大去除的内源有机质(藻源有机物)可能是混凝后THMs的主要前体物质。因此,传统的混凝工艺主要去除DOM的腐殖酸部分,还需要结合其他的预处理方法对DOM中的其他组分进行有效去除,以控制THMs的生成势,提高饮用水的安全性。
关键词: 混凝/
溶解性有机质/
卤代烃生成势/
三维荧光光谱/
红外光谱/
羰基类共轭结构
Abstract:In this paper, two coagulants containing Al3+ and Fe3+ were applied to control dissolved organic matter (DOM) at water intake of Hongfeng lake and minimize subsequent trihalomethanes (THMs) formation potential. After coagulation, results indicated TOC and UV254 removal rates were reached at 60% and 85%, respectively. Increased fast mixing rate will promote TOC removal. In contrast, hydraulic condition and coagulant dosage had less impact on UV254 removal. On controlling of THMs formation potential, around 60% THMs were decreased after coagulation, CHCl2Br and CHClBr2 were main species(>80%)formed upon chlorination. Effect of hydraulic condition and dosages were hardly affected THMs formation and speciation. Results of 3D-EEM indicated that humic acid were mainly removed during coagulation processes without further structure change. FTIR results showed the removed functional group was carbonyl group (CO) and similar conjugated structure. Autochthonous DOM, such as algal organic matter, is most likely serve as THM precursor after coagulation processes. Thus, traditional coagulation processes were mainly decrease the content of humic acid in DOM, other treatment techniques were required to further remove the left organic fractions in DOM to decrease the risk formation of THMs in disinfection processes.
Key words:coagulation/
dissolved organic matter (DOM)/
THMs formation potential/
3D excitation emission matrix-spectra (3D-EEM)/
infrared spectrum/
carbonyl group (conjugated) like structure.
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Al2(SO4)3和FeCl3混凝对红枫湖溶解性有机质的去除及卤代烃控制的影响
王志康1,,范毅1,
桂昕1,
黄川1,
王雅洁1,
张润宇2,
朱四喜1
1.贵州民族大学生态环境工程学院,贵阳 550025
2.中国科学院地球化学研究所,贵阳 550002
基金项目: 贵州省科技厅-贵州民族大学联合基金项目(黔科合LH字[2014]7383号) 贵州省科技厅基础研究项目(黔科合基础[2016]1071) 贵州民族大学引进人才项目(15XRY010)
关键词: 混凝/
溶解性有机质/
卤代烃生成势/
三维荧光光谱/
红外光谱/
羰基类共轭结构
摘要:以三价阳离子(Al2(SO4)3和FeCl3)为混凝剂,在不同的投加量和水力条件下对贵阳市红枫湖取水口处溶解性有机质(DOM)的去除和卤代烃(THMs)生成势控制变化趋势进行研究。实验结果表明,在不同的混凝条件下,对DOM的去除率在60%左右,随着快速搅拌速率的增加,去除率略有提高;UV254的去除率为85%左右,不同的混凝剂投加量和水力条件对其影响不大。混凝前后DOM的THM生成势降低约60%,二氯一溴甲烷(CHCl2Br)和一氯二溴甲烷(CHClBr2)占THMs的80%以上；对于不同的混凝剂类型,投加量和水力条件均对THMs生成势变化没有明显差异。三维荧光光谱(3D-EEM)结果表明,DOM中腐殖酸部分在混凝过程中有较大去除,红外光谱(FTIR)验证了混凝去除的基团主要为羰基(CO)的类共轭结构。而在强化混凝过程中没有得到较大去除的内源有机质(藻源有机物)可能是混凝后THMs的主要前体物质。因此,传统的混凝工艺主要去除DOM的腐殖酸部分,还需要结合其他的预处理方法对DOM中的其他组分进行有效去除,以控制THMs的生成势,提高饮用水的安全性。
English Abstract
Effect of Al2(SO4)3 and FeCl3 coagulation on removal of dissolved organic matter and trihalomethanes formation potential control in Hongfeng lake
WANG Zhikang1,,FAN Yi1,
GUI Xin1,
HUANG Chuan1,
WANG Yajie1,
ZHANG Runyu2,
ZHU Sixi1
1.College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
2.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
Keywords: coagulation/
dissolved organic matter (DOM)/
THMs formation potential/
3D excitation emission matrix-spectra (3D-EEM)/
infrared spectrum/
carbonyl group (conjugated) like structure
Abstract:In this paper, two coagulants containing Al3+ and Fe3+ were applied to control dissolved organic matter (DOM) at water intake of Hongfeng lake and minimize subsequent trihalomethanes (THMs) formation potential. After coagulation, results indicated TOC and UV254 removal rates were reached at 60% and 85%, respectively. Increased fast mixing rate will promote TOC removal. In contrast, hydraulic condition and coagulant dosage had less impact on UV254 removal. On controlling of THMs formation potential, around 60% THMs were decreased after coagulation, CHCl2Br and CHClBr2 were main species(>80%)formed upon chlorination. Effect of hydraulic condition and dosages were hardly affected THMs formation and speciation. Results of 3D-EEM indicated that humic acid were mainly removed during coagulation processes without further structure change. FTIR results showed the removed functional group was carbonyl group (CO) and similar conjugated structure. Autochthonous DOM, such as algal organic matter, is most likely serve as THM precursor after coagulation processes. Thus, traditional coagulation processes were mainly decrease the content of humic acid in DOM, other treatment techniques were required to further remove the left organic fractions in DOM to decrease the risk formation of THMs in disinfection processes.
