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臭氧—生物活性炭技术是目前国内外应对微污染水源水处理的最常用技术之一。上海某水厂采用预臭氧/常规处理/臭氧—生物活性炭组合工艺运行了4年,活性炭滤池的运行经历了吸附、生物活性炭和换炭3个阶段。运行结果表明,该工艺可以提高对高锰酸盐指数(CODMn)、氨氮、锰的去除率,改善出厂水的色度、嗅味和致突变性等多项水质指标,全面提高水质。但该技术也存在一定的局限性,如冬季对氨氮的去除率降低,原水的CODMn过高时出厂水CODMn仍会超过3 mg/L的标准;另外运行中要严格控制生物繁殖,防止微生物流出。此外,臭氧—生物活性炭技术会增加建设投资和运行成本,活性炭更换周期为3年半,以更换2/3的活性炭为宜。
Ozone - biological activated carbon technology is currently one of the most commonly used technologies to deal with micro-polluted water sources at home and abroad. A water plant in Shanghai has been operating for 4 years with pre-ozone / conventional treatment / ozone-bio-active carbon combination process. The operation of activated carbon filter has undergone three stages of adsorption, bio-activated carbon and carbon exchange. The results show that the process can improve the removal of permanganate index (CODMn), ammonia nitrogen, manganese, and improve the water quality indicators of the factory water color, odor and mutagenicity and a number of water quality, improve water quality. However, the technology has some limitations. For example, the removal rate of ammonia nitrogen is reduced in winter and the CODMn in the raw water still exceeds the standard of 3 mg / L when the CODMn of the raw water is too high. In addition, the biological reproduction must be strictly controlled during operation to prevent the outflow of microorganisms . In addition, ozone-bio-activated carbon technology will increase construction investment and operating costs, activated carbon replacement cycle of 3.5 years to replace 2/3 of activated carbon is appropriate.