Removal laws of organic pollutants in the secondary effluent of a WWTP by O3 and O3/H2O2 processes were studied through adjusting the dosages of O3 and H2O2 in batch test.Results showed that when the dosage of O3 was 3.5 mg/L,removal rates of tryptophan aromatic protein,fulvic acid,microbial metabolites and humic acid were 80.0％,79.3％,85.4％ and 84.1％,respectively.When O3 dosage was increased to 10 mg/L,removal rates of COD,UV254,TOC and chromaticity were 26.6％,59.5％,9.6％ and 88.2％,respectively.Absorption rate of O3 Was enhanced with the increase of pH value,as when O3 dosage was 33.5 mg/L,the adsorption rate of O3 under pH value of 11 was 31.1％ higher than that under pH value of 3.When O3 dosage was under 13 mg/L,no obvious quality improvement of the treated water was found by adding H2O2.When O3 dosage exceeded 13 mg/L and the molar ratio of O3/H2 O2 was below 1.25,adding hydrogen peroxide made COD and TOC of the effluent decreased with the increase of molar ratio of O3/H2 O2.The maximum removal rates of COD and TOC were 37.7％ and 16.6％,respectively,and compared to the treatment by O3 only,the removal rates were increased by 10.7％ and 5.4％.%以某城市污水处理厂二级出水为原水,采用批量试验方法,通过调整臭氧和双氧水剂量,研究臭氧氧化和臭氧/双氧水组合工艺对水中有机物的去除规律.结果表明:在臭氧剂量为3.5 mg/L时,水中色氨酸类芳香族蛋白质、富里酸类物质、微生物代谢产物和腐殖质类物质的去除率分别为80.0％、79.3％、85.4％和84.1％;当臭氧剂量增加到10 mg/L时,COD、UV254 、TOC和色度的去除率分别为26.6％、59.5％、9.6％和88.2％.水中pH值的升高促进臭氧的吸收,当臭氧投加量为33.5 mg/L时,pH值=11时的臭氧吸收率比pH值=3时提高31.1％.当臭氧剂量<13 mg/L时,投加双氧水的处理效果无明显影响;当臭氧剂量≥13 mg/L,且双氧水与臭氧的摩尔比值在1.25内时,双氧水的投加使得出水COD和TOC随双氧水与臭氧摩尔比值的增加逐渐降低,最大去除率分别为37.7％和16.6％,较臭氧单独处理时分别提高10.7％和5.4％.
展开▼
