预紫外/混凝沉淀控制低浊高藻水三氯乙醛生成潜能
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摘要
以深圳地区某低浊高藻原水为研究对象,分别考察了单独紫外及预紫外/混凝沉淀组合工艺对三氯乙醛生成潜能(CHFP)的控制效果,以明确预紫外/混凝沉淀工艺控制CHFP的可行性,为水厂控制三氯乙醛(CH)提供参考。在单独紫外及紫外与混凝沉淀工艺联用条件下,对CHFP的去除率均随着紫外剂量的增加而增大,在紫外剂量为1 400 m J/cm~2时,对CHFP的去除率达到最大,分别为33. 61%、81. 56%;该地区原水中的溶解性有机物(DOM)以芳香性蛋白质类物质为主,且CH的前体物含量与芳香性蛋白质类物质和溶解性微生物代谢产物关系密切,单独紫外对DOM有较好的去除效果,对荧光区域Ⅳ所表征的溶解性微生物代谢产物的去除率最高,为40. 64%;相比单独混凝沉淀对CHFP的去除率(55. 37%),紫外与混凝沉淀联用工艺对CHFP的去除率提高了26. 19%,这说明预紫外有很好的助凝效果;预紫外/混凝沉淀工艺对荧光区域Ⅳ物质的去除率最高,为35. 2%。
The removal of chloral hydrate formation potential( CHFP) by UV and UV pretreatment/coagulation sedimentation processes was studied for the low turbidity and high algae-laden water in Shenzhen area in order to provide guidance for controlling CH during water treatment. The experiment results showed that for UV or UV pretreatment/coagulation sedimentation processes,the removal rate of CHFP increased with the increase of UV dose. When the UV dose was 1 400 m J/cm~2,the removal effect of CHFP reached the maximum and the removal rates were 33. 61% and 81. 56%,respectively. Furthermore aromatic protein-like substances were main components of DOM,and the relationship between the content of CH precursors and the contents of soluble microbial product( SMP) or aromatic protein-like substances was best. UV pretreatment achieved better effect on DOM control and the removal rate of SMP-like was highest with 40. 64%. Compared with coagulation sedimentation process( 55. 37%),the removal rate for CHFP by UV pretreatment/coagulation sedimentation processes increased by 26. 19%,which indicated that UV pretreatment was conducive to coagulation sedimentation. The UV pretreatment/coagulation sedimentation process also had a good removal effect on the organic matter in fluorescent region Ⅳ.
The removal of chloral hydrate formation potential( CHFP) by UV and UV pretreatment/coagulation sedimentation processes was studied for the low turbidity and high algae-laden water in Shenzhen area in order to provide guidance for controlling CH during water treatment. The experiment results showed that for UV or UV pretreatment/coagulation sedimentation processes,the removal rate of CHFP increased with the increase of UV dose. When the UV dose was 1 400 m J/cm~2,the removal effect of CHFP reached the maximum and the removal rates were 33. 61% and 81. 56%,respectively. Furthermore aromatic protein-like substances were main components of DOM,and the relationship between the content of CH precursors and the contents of soluble microbial product( SMP) or aromatic protein-like substances was best. UV pretreatment achieved better effect on DOM control and the removal rate of SMP-like was highest with 40. 64%. Compared with coagulation sedimentation process( 55. 37%),the removal rate for CHFP by UV pretreatment/coagulation sedimentation processes increased by 26. 19%,which indicated that UV pretreatment was conducive to coagulation sedimentation. The UV pretreatment/coagulation sedimentation process also had a good removal effect on the organic matter in fluorescent region Ⅳ.
引文
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[5] Zhang X L,Yang H W,Wang X M,et al. Formation of disinfection by-products:effect of temperature and kinetic modeling[J]. Chemosphere,2013,90(2):634-639.
[6]王文东,张轲,许洪斌,等.紫外辐射对小球藻混凝效果作用途径探讨[J].环境科学,2016,37(1):187-192.Wang Wendong,Zhang Ke,Xu Hongbin,et al. Effect of UV light radiation on the coagulation of chlorella and its mechanism[J]. Environmental Science,2016,37(1):187-192(in Chinese).
[7]樊杰.紫外线预处理城市给水高藻水的试验研究[D].武汉:华中科技大学,2005.Fan Jie. Study on Ultraviolet Pretreatment of High Algae Water in Urban Water Supply[D]. Wuhan:Huazhong University of Science and Technology,2005(in Chinese).
[8]李华,王文东,王晓昌,等.臭氧-紫外预处理对高有机物原水混凝效果的影响[J].环境科学,2010,31(8):1807-1812.Li Hua,Wang Wendong,Wang Xiaochang,et al. Effect of ozone-UV pretreatment on coagulation of raw water with high organic matter[J]. Environmental Science,2010,31(8):1807-1812(in Chinese).
[9] Leenheer J A,CrouéJ P. Peer reviewed:Characterizing aquatic dissolved organic matter[J]. Environ Sci Technol,2003,37(1):18A-26A.
[10] Chen W,Westerhoff P,Leenheer J A,et al. Fluorescence excitation-emission matrix regional integration to quantify spectra for dissolved organic matter[J]. Environ Sci Technol,2003,37(24):5701-5710.
[11]蔡广强,刘丽君,卢小艳,等.典型南方水源溶解性有机物荧光特性变化与去除[J].环境工程学报,2015,9(11):5288-5294.Cai Guangqiang,Liu Lijun,Lu Xiaoyan,et al. Fluorescence characteristics variation and removal of dissolved organic matter in a typical drinking water source in the south of China[J]. Chinese Journal of Environmental Engineering,2015,9(11):5288-5294(in Chinese).
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