循环水系统溶解性有机物迁移转化规律研究
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摘要
用凝胶色谱和三维荧光等图谱手段对某电厂循环水系统溶解性有机物(DOM)迁移转化规律进行分析研究。结果表明,循环水补充水为地表水时,加酸将循环水补充水碱度由1.53 mmol/L降低至0.83 mmol/L,化学耗氧量(COD)和总有机碳(TOC)去除率分别为30.40%和23.29%;循环水浓缩倍率5.97,混凝澄清对循环水排污水溶解性COD和TOC去除率分别为30.83%和49.58%,混凝澄清出水有机物可以满足后续膜处理对进水有机物的要求。循环水补充水和循环水排污水重均分子量(Mw)分别为288×10~6和189×10~6g/mol,循环水排污水中有机物分子量小于循环水补充水;加酸降低pH和混凝去除的主要是大分子有机物,但混凝去除有机物的分子量范围更广。循环水系统DOM主要的荧光物质为类腐殖和类色氨酸,相对于类色氨酸,降低pH和混凝过程对类腐殖质这类有机物的去除率更高。
Transformation of dissolved organic matters(DOM) for the circulating water system in thermal power plant was investigated by conventional chemical analysis,gel filtration chromatography(GPC),threedimensional fluorescence and fourier transform infrared spectroscopy(FTIR).Results indicated that alkalinity of surface water reduced from 1.53 mmol/L to 0.83 mmol/L after adding acid,COD and TOC removal efficiency was 30.83% and 23.29%.Surface water,after reducing the alkalinity,was used for the circulating water systems.The concentration ratio of the circulating water was 5.97.Enhanced coagulation was employed to clarify the circulating water blowdown water and the removal rate of TOC was 30.83% and 49.58%.The effluent of coagulation treatment had met the requirements of the subsequent membrane treatment.The molecular weight of make-up water and sewage were 288×10~6 and 189×10~6 g/mol,separately.The molecular weight of circulating sewage was smaller than make-up water.Lowering pH with adding acid and coagulation mainly removed larged molecular organic components,however,coagulation removed broader molecular organic components.The major fluorescent constituents in DOM include humic and tryptophanlike substances.The processes of lowering pH and coagulation mainly removed humic-like substances.
Transformation of dissolved organic matters(DOM) for the circulating water system in thermal power plant was investigated by conventional chemical analysis,gel filtration chromatography(GPC),threedimensional fluorescence and fourier transform infrared spectroscopy(FTIR).Results indicated that alkalinity of surface water reduced from 1.53 mmol/L to 0.83 mmol/L after adding acid,COD and TOC removal efficiency was 30.83% and 23.29%.Surface water,after reducing the alkalinity,was used for the circulating water systems.The concentration ratio of the circulating water was 5.97.Enhanced coagulation was employed to clarify the circulating water blowdown water and the removal rate of TOC was 30.83% and 49.58%.The effluent of coagulation treatment had met the requirements of the subsequent membrane treatment.The molecular weight of make-up water and sewage were 288×10~6 and 189×10~6 g/mol,separately.The molecular weight of circulating sewage was smaller than make-up water.Lowering pH with adding acid and coagulation mainly removed larged molecular organic components,however,coagulation removed broader molecular organic components.The major fluorescent constituents in DOM include humic and tryptophanlike substances.The processes of lowering pH and coagulation mainly removed humic-like substances.
引文
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[20]齐雪梅,刘永昌.p H值对强化混凝去除水中微量有机物的影响[J].工业用水与废水,2008,39(2):28-55.
[21]来晓芳,王吉德,徐新良,等.绿色水处理剂聚天冬氨酸及其改性研究进展[J].现代化工,2013,33(4):24-27.
[2]姜琪,李瑞瑞,雷方俣,等.某电厂膜法用于循环水系统的方案优化[J].工业安全与环保,2014,40(11):93-95.
[3]牛天浩,周振,胡大龙,等.污水处理厂污泥水溶解性有机物的光谱特性分析[J].环境科学,2016,37(4):1460-1466.
[4]李海波,孙晨,刘晓玲,等.三维荧光光谱解析城市污水有机物的去除特征[J].中国环境科学,2016,36(8):2371-2379.
[5]Zhu L,Qi H,Lv M,et al.Component analysis of extracellular polymeric substances(EPS)during aerobic sludge granulation using FTIR and 3D-EEM technologies[J].Bioresource Technology,2012,124(3):455-459.
[6]周志伟,杨艳玲,李星,等.滤池反冲水回流混凝工艺中溶解性有机物荧光特性[J].化工学报,2013,64(5):1825-1832.
[7]钱玉山,王瑛,龚云峰.混凝p H对水中溶解态有机物去除影响研究[J].能源环境保护,2009,23(1):38-40.
[8]董秉直,曹达文,范瑾初.最佳混凝投加量和p H去除水中有机物的研究[J].工业水处理,2002,22(6):29-31.
[9]朱松梅,周振,谢跃,等.工业园区污水厂溶解性有机物转化规律研究[J].环境科学与技术,2016,39(7):18-22.
[10]常英,刘智安,薛金英.中水回用电厂循环冷却水杀菌剂的优化[J].工业水处理,2011,31(12):28-30.
[11]黄廷林,方开凯,张春华,等.利用UV-vis及EEMs对比冬季完全混合下两个不同特征水库溶解性有机物的光学特性[J].环境科学,2016(12):1-8.
[12]Stedmon C A,Markager S.Resolving the variability in dissolved organic matter fluorescence in a temperate estuary and its catchment using PARAFAC analysis[J].Limnology&Oceanography,2005,50(2):686-697.
[13]Murphy K R,Stedmon C A,Waite T D,et al.Distinguishing between terrestrial and autochthonous organic matter sources in marine environments using fluorescence spectroscopy[J].Marine Chemistry,2008,108(1/2):40-58.
[14]闫丽红,陈学君,苏荣国,等.2010年秋季长江口口外海域CDOM的三维荧光光谱-平行因子分析[J].环境科学,2013,34(1):51-60.
[15]药怡良,赵卫红,苗辉.基于三维荧光光谱结合平行因子分析对春季北黄海有色溶解有机物的研究[J].光谱学与光谱分析,2016,36(8):2532-2536.
[16]孔赟,朱亮,吕梅乐,等.三维荧光光谱技术在水环境修复和废水处理中的应用[J].生态环境学报,2012,(9):1647-1654.
[17]Cory R M,Mcknight D M.Fluorescence spectroscopy reveals ubiquitous presence of oxidized and reduced quinones in dissolved organic matter[J].Environmental Science&Technology,2005,39(21):8142-8149.
[18]Murphy K R,Ruiz G M,Dunsmuir W T M,et al.Optimized parameters for fluorescence-based verification of ballast water exchange by ships[J].Environmental Science&Technology,2006,40(40):2357-2362.
[19]Stedmon C A,Markager S,Bro R.Tracing dissolved organic matter in aquatic environments using a new approach to fluorescence spectroscopy[J].Marine Chemistry,2003,82(3/4):239-254.
[20]齐雪梅,刘永昌.p H值对强化混凝去除水中微量有机物的影响[J].工业用水与废水,2008,39(2):28-55.
[21]来晓芳,王吉德,徐新良,等.绿色水处理剂聚天冬氨酸及其改性研究进展[J].现代化工,2013,33(4):24-27.
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