PAC、PFS混凝剂去除微污染水体中PCBs效果研究
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摘要
以聚合氯化铝(PAC)、聚合硫酸铁(PFS)为混凝剂,采用强化混凝的水处理方法,完成对低浊度微污染水体中多氯联苯(PCBs)的去除,考察了2种混凝剂的投加量、水样初始浊度、水样pH值以及水力条件等因素对PAC、 PFS混凝剂去除低浊度水体中PCBs的效果影响。研究得出,当PAC投加量为7 mL/L,水样初始浊度为62NTU,慢速搅拌时间为15 min, pH值为5.0时, PAC强化混凝效果最佳,其对水样中PCBs的去除率为68.42%～76.02%,剩余浊度为1.01 NTU;当PFS投加量为5.5 mL/L,水样初始浊度为62 NTU,慢速搅拌时间为15 min,p H值为6.5时, PFS强化混凝效果最佳,其对水样中PCBs的去除率为70.30%～77.52%,剩余浊度为4.14 NTU。研究得出, PAC、 PFS均能有效去除微污染水体中的PCBs,且与PAC相比, PFS的去除效果更佳。
Polychlorinated biphenyls(PCBs) in micro-polluted water was removed by enhanced coagulation process with poly aluminum chloride(PAC) and poly ferric sulfate(PFS) as coagulants, the influences of two kinds of coagulants dosage, initial turbidity and pH value of water samples, hydraulic condition and some other factors on PCBs removal from low-turbidity water were investigated. The results of the test showed that, the optimal enhanced coagulation performance of PAC which showed a PCBs removal rate of 68.42%-76.02% was obtained under the condition that the PAC dosage was 7 mg/L, the initial turbidity of water sample was 62 NTU,the low-speed stirring time was 15 min, and the pH value was 5.0. However, for PFS, the optimal enhanced coagulation condition was: the residual turbidity was 1.01 NTU, the PFS dosage was 5.5 mL/L, the initial turbidity of water sample was 62 NTU, the low-speed stirring time was 15 min, and the pH value was 6.5. Under the above condition, the removal rate of PCBs was 70.30%-77.52%, the residual turbidity was 4.14 NTU. It could draw a conclusion that, both PAC and PFS could remove PCBs from micro-polluted water effectively, and compared to PAC, PFS has a better removal effect.
Polychlorinated biphenyls(PCBs) in micro-polluted water was removed by enhanced coagulation process with poly aluminum chloride(PAC) and poly ferric sulfate(PFS) as coagulants, the influences of two kinds of coagulants dosage, initial turbidity and pH value of water samples, hydraulic condition and some other factors on PCBs removal from low-turbidity water were investigated. The results of the test showed that, the optimal enhanced coagulation performance of PAC which showed a PCBs removal rate of 68.42%-76.02% was obtained under the condition that the PAC dosage was 7 mg/L, the initial turbidity of water sample was 62 NTU,the low-speed stirring time was 15 min, and the pH value was 5.0. However, for PFS, the optimal enhanced coagulation condition was: the residual turbidity was 1.01 NTU, the PFS dosage was 5.5 mL/L, the initial turbidity of water sample was 62 NTU, the low-speed stirring time was 15 min, and the pH value was 6.5. Under the above condition, the removal rate of PCBs was 70.30%-77.52%, the residual turbidity was 4.14 NTU. It could draw a conclusion that, both PAC and PFS could remove PCBs from micro-polluted water effectively, and compared to PAC, PFS has a better removal effect.
引文
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[24]梁聪,邓慧萍,苏宇,等.聚合硫酸铁、硫酸铝强化混凝去除水中的腐植酸[J].净水技术, 2006, 25(2):27-31.
[2] LIU P Y, CHANG Q, LI Z S, et al. Elimination of the micro-pollution caused by organic chloride pesticide in drinking water byenhanced coagulation[J]. Fresenius Environmental Bulletin,2013, 22(11a):3370-3376.
[3]李宗硕,刘鹏宇,常青,等.强化混凝消除微污染水中有机氯的研究[J].中国环境科学, 2013, 33(2):251-256.
[4]聂小保,张鹏.强化混凝与活性炭联用处理赣江微污染水源水试验[J].环境工程, 2007, 25(3):90-91.
[5] ZHENG H L, ZHU G C, JIANG S J, et al. Investigations ofcoagulation-flocculation process by performance optimization modelprediction and fractal structure o I flocs[J].Desalination, 2011,269:148-156.
[6] LI F T, HE Y, PAN H J. Study of the influential factors of polyaluminum chloride on the coagulation performance[J]. IndustrialWater Treatment, 2008, 28(10):40-43.
[7]李凤婷.我国混凝剂聚合硫酸铁的技术发展现状[J].工业水处理, 2002, 22(1):5-8.
[8] WEI J C, GAO B Y, YUE Q Y, et al. Performance and mecha-nism of polyferric-quaternary ammonium salt composite flocculantsin treating high organic matter and high alkalinity surface water[J].J Hardous Sardous Materials, 2009, 165(1-3):789-795.
[9]祁佩时,李立君.聚硅硫酸铁混凝去除石化废水二级出水中有机污染物的研究[J].环境污染与防治, 2010, 32(3):43-46.
[10] BOLTO B, GREGORY J. Organic polyelectrolytes in water treat-ment[J]. Water Research, 2007, 41(11):2301-2324.
[11]王东升,刘海龙,晏明全,等.强化混凝与优化混凝:必要性、研究进展和发展方向[J].环境科学学报, 2006, 26(4):544-551.
[12]杨智宽.污染控制化学[M].武汉:武汉大学出版社, 2002.
[13] BIRDI K S. Surface and Colloid Chemistry:Principles and Ap-plications[M]. 1 st edition. CRC Press, 2010.
[14] ZHANG Z G, LIU D, HU D D, et al. Effects of slow-mixing onthe coagulation performance of polyaluminum chloride(PACI)[J].Chinese J Chem Eng, 21(3):318-323.
[15]李宗硕.强化混凝消除微污染水中有机氯的研究[D].兰州:兰州交通大学, 2009.
[16]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(4):28-30.
[17]王梓松,谢更新,曾光明,等.聚合氯化铝对水体中双酚A的混凝特征[J].中国环境科学, 2008, 28(6):531-535.
[18]刘成,高乃云,严敏,等. 2种混凝剂对原水中细菌去除机理异同的研究[J].同济大学学报(自然科学版), 2007, 35(3):361-365.
[19] SYLVA R N. The hydrolysis of iron(Ⅲ)[J]. Rev Pure ApplChem, 1972, 22:115-132.
[20] SPIRO T G, ALLERTON S E, RENNER J, et al. The hydrolyticpolymerization ofiron(Ⅲ)[J]. J Am Chem Soc, 1966, 88:2721-2726.
[21] CHENG W P, CHI F H. A study of coagulation mechanism ofpolyferric sulfate reacting with humic acid using a fluorescence-quenching method[J]. Water Research, 2002, 36:4583-4591.
[22]汤鸿霄.无机高分子复合絮凝剂的研制趋向[J].中国给水排水, 1999, 15(2):1-4.
[23]高宝玉,魏锦程,王燕.聚合铁复合絮凝剂处理地表水的性能研究[J].中国给水排水, 2006, 22(7):57-61.
[24]梁聪,邓慧萍,苏宇,等.聚合硫酸铁、硫酸铝强化混凝去除水中的腐植酸[J].净水技术, 2006, 25(2):27-31.