臭氧氧化深度处理二级处理出水的研究

以某城市污水处理厂二级处理出水为原水,研究了臭氧氧化深度处理对水中残留有机物以及病原微生物的降解和去除效果.结果表明,臭氧投加量达到6mg/L时,DOC、UV254、色度的去除率分别为15.49%、36.36%、73.61%,环境激素类痕量有机物邻苯二甲酸二丁酯(DBP)和邻苯二甲酸二(2-乙基己基)酯(DEHP)的去除率分别为37.29%和14.6%,三维荧光光谱荧光峰的各区域有机物质平均去除率在80%以上,DBP出水浓度为2.64mg/L,DEHP出水浓度为1.4mg/L,满足《城市污水再生利用地下水回灌水质》(GB/T 19772-2005)的标准.臭氧投加量达到10mg/L时,出水中指示性微生物粪大肠菌群仍接近103CFU/L,5mg/L有效氯消毒后出水粪大肠菌群仍接近10CFU/L,6mg/L臭氧与5mg/L有效氯组合消毒出水的粪大肠菌群下降至3CFU/L,满足《城市污水再生利用景观环境用水水质》(GB/T 18921-2002)的标准.三卤甲烷(THMs)的生成量随着有效氯投加量的增加而增加,臭氧与氯组合消毒过程与氯单独消毒过程相比,THMs生成量减少了78.08%.

Advanced treatment of secondary effluent by ozonation

The objective of this work was to investigate the effectiveness of ozonation on the removal of organic residues and pathogenic microorganism from the municipal secondary effluent. The DOC, UV254, chroma, di-n-butyl phthalate (DBP),di-2-ethylhexyl phthalate (DEHP) and organic pollutants of three-dimensional fluorescence removals of ozonation were 15.49%, 36.36%, 73.61%, 37.29%, 14.6% and above 80% at a dose of 6mg/L, respectively. And the ozonated secondary effluent concentration of DBP and DEHP was 2.64mg/L and 1.4mg/L, respectively, which meets the standard of the Reuse of Urban Recycling Water Quality Standard for Groundwater Recharge (GB/T 19772-2005). The fecal coliforms were close to 103CFU/L and 10CFU/L by ozonation (at a ozone dose of 10mg/L) and chlorination (at a available chlorine dose of 5mg/L), respectively. However, the combination of ozonation (at a ozone dose of 6mg/L) and chlorination (at a available chlorine dose of 5mg/L) led to an increased removal of fecal coliforms of 3CFU/L, which meets the standard of the Reuse of Urban Recycling Water-Water Quality Standard for Scenic Environment Use (GB/T 18921-2002). The generation of trihalomethanes (THMs) increased with the increase of available chlorine dosage, while it was reduced by 78.08% by using the combination of ozonation and chlorination.