共查询到18条相似文献,搜索用时 218 毫秒
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微污染水源水预氧化除藻试验研究 总被引:5,自引:0,他引:5
以微污染水库水为原水 ,采用臭氧、过氧化氢、高锰酸钾、紫外线及其不同组合作为预氧化剂 ,进行了预氧化除藻的中试研究。试验结果表明 ,预氧化能够明显提高水中藻类的去除率 ,这些预氧化方法都可达到 90 %以上的除藻率。其中以紫外线对藻类的去除率最高 ,可达 97.8% ,但紫外线在生产上的应用受到限制 ;而单独使用臭氧时除藻效果相对较差。实际应用中预氧化除藻可采用臭氧 过氧化氢联合方案 ,或者在接触氧化时间允许情况下选用高锰酸钾方案 相似文献
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针对高氨氮、高有机物污染的淀浦河原水进行了高锰酸钾、高锰酸钾复合盐(PPC)预氧化研究。结果表明,高锰酸钾的除锰效果优于高锰酸钾复合盐,高锰酸钾最佳投加量为1.0mg/L,此时出水中锰的平均浓度由0.34mg/L降至0.09mg/L,当投加量大于1.5mg/L时,出水锰含量开始反弹;高锰酸钾复合盐的最佳投加量为1.5mg/L,并且在0-3mg/L的投加量范围内,出水锰含量没有发生反弹。高锰酸钾复合盐的助凝效果优于高锰酸钾,当高锰酸钾及其复合盐的投加量分别为1.0mg/L和1.5mg/L时,助凝效果最好(剩余浊度去除率分别提高31.6%和41.8%).高锰酸钾及其复合盐对UV254和耗氧量没有明显去除效果,两者均会增加出水色度。综合考虑处理效果与助凝剂使用成本,认为试验期间的淀浦河原水更适合采用高锰酸钾预氧化技术。 相似文献
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钱晖 《水科学与工程技术》2009,(2):24-26
以低温低浊度地表水为研究对象,研究了臭氧预氧化对浊度、色度、UV254、TOC、CODMn、藻类的去除效果及对后续气浮、过滤等常规工艺处理效果的影响。对于低温低浊度地表水预臭氧化具有明显助凝作用,可以提高混凝沉淀效果,同时可以降低原水色度。预臭氧化去除有机物效果明显。 相似文献
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采用超滤、颗粒活性炭和紫外线消毒组合工艺对自来水进行深度处理。试验表明,对水中浊度、CODMn、UV254、细菌总数的平均去除率分别为89.8%、90.7%、96.2%和94.5%,以上各参数最终出水平均值分别为0.155NTU、0.35mg/L、0.009cm-1、0CFU/mL,达到了现行《生活饮用水卫生标准》(GB5749—2006)和《饮用净水水质标准》(CJ94—2005)的要求。因此,超滤、颗粒活性炭与紫外线消毒组合工艺用于制备直接饮用水是可行的。 相似文献
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In this study, the effect of three oxidants, sodium hypochlorite, potassium permanganate, and ozone, were tested for the removal of 2-MIB with presence of cyanobacteria. Algae in water samples from the source water of Feng-Shen waterworks (FSW), Taiwan were cultivated at 30 degrees C with continuous light at an intensity between 2,500 and 3,400 lux. During the cultivating process, water samples were analyzed for nutrients, light absorbance at 665 nm (A665), and 2-MIB concentration. The 2-MIB concentrations within the incubated samples increased to as high as 1,000 ng/L to 2,000 ng/L, although no extra nutrients were added to the raw water. After 2 to 3 days incubation, the intracellular 2-MIB concentration was as high as 70% of the total 2-MIB in the samples. The algae that developed were mainly cyanobateria, and more than 90% belonged to the Genus Oscillatorias. An almost 100% removal of both 2-MIB and geosmin in the raw water was observed after ozonation for 10 minutes at a dosing rate of 0.91 mg/l-min. Chlorine and permanganate were much less effective, both removing only about 11% of the 2-MIB within 60 minutes at oxidant concentration of 10 mg/l. Oxidation of the cultivated samples showed that chlorine and permanganate may damage algae cells causing them to release intracellular 2-MIB. During the 60 minutes of reaction time, the total 2-MIB concentrations (intracellular plus dissolved) varied by no more than 10%, however, the ratios between dissolved and total 2-MIB concentrations increased. Two effects of ozonation on the 2-MIB concentration in the cultivated samples were observed when the algae were young, namely 2-MIB release from damaged cells and 2-MIB oxidization. The rates of 2-MIB release and 2-MIB destruction were similar. However, old algae cells were more easily damaged. As a result, intracellular 2-MIB was released faster, and the soluble 2-MIB was destroyed more quickly by ozonation. 相似文献
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利用生物慢滤池对人工模拟污水和西安市某污水处理厂的二级出水进行了深度净化处理实验,通过分析进出水中氮、磷含量和高锰酸盐指数及上层水和出水中的叶绿素a含量等指标,考察了生物慢滤池的净化效果。结果表明:生物慢滤池对人工模拟污水的处理效果较好,总氮、氨氮、总磷和高锰酸盐指数的去除率分别为66.4%、40.2%、66.4%和73.3%;深度净化污水厂二级出水,总氮、氨氮、总磷和高锰酸盐指数的去除率分别为35.1%、21.0%、30.2%和12.6%,去除率略低于人工模拟实验;生物慢滤池对叶绿素a有很好的截留效果,去除率分别为93.4%和66.4%;生物慢滤池处理后的再生水水质达到《城市污水再生利用景观环境用水水质》要求,可回用于城市景观水体,作为城市景观水体的补充水源,避免水体富营养化的发生。 相似文献
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A combined system using nano MgO and nanofiltration (NF) membrane was established to purify polluted water in this experiment. The turbidity, permanganate index, UVA254, colony counts and the concentrations of NO3-, NO2-, NH4+, Fe, Mn and Mg of the effluents from each unit of this combined system were measured to investigate the pollutant removal of this system. Based on the results obtained, the combined nano MgO-NF system could efficiently remove many kinds of pollutants in this experiment, including organic matter, nitrogen species, heavy metals, suspended solids and bacteria. And the effluents could meet the standard of drinking water. Furthermore, increasing the nano MgO dosage could not elevate the removal ratio of the pollutants, but only increase the Mg content of the effluent. Thus, 0.05 g L(-1) of nano MgO may be a suitable dosage for 2,000 L of polluted water treatment. Also, the operating pressure of NF membrane had no significant effect on pollutant removal when the operating pressure of NF membrane was increased from 0.3 to 0.9 MPa. 相似文献
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高锰酸盐-聚丙烯酰胺联用强化混凝处理太湖支流原水研究 总被引:1,自引:0,他引:1
太湖B支流地表水受水土流失、水体富营养化和环境污染等因素影响,水体污染严重,水中有机物浓度和藻密度相对较高。常规的"混凝—沉淀—砂滤—加氯消毒"处理工艺难以有效地去除水中有机物、铁锰、藻类等物质。采用高锰酸盐(PPC)-聚丙烯酰胺(PAM)联用强化混凝工艺对原水进行处理。高锰酸盐投量在0.45 mg/L和聚丙烯酰胺投量在0.07 mg/L条件下联用强化混凝的静态试验结果表明:PPC-PAM联用强化混凝对浊度、色度、铁、锰和耗氧量的平均去除率为90%、73%、92%、99%和38%。PPC在0.3~0.5 mg/L投量和PAM在0.05~0.10 mg/L投量下联用强化混凝生产试验的出厂水浊度、色度、铁、锰等指标,均比历史同期水平要好。 相似文献