催化臭氧氧化与NaClO处理钛白粉废水中试对比

COMPARATIVE PILOT TEST OF CATALYTIC OZONE OXIDATION AND NaClO IN TREATING TITANIUM DIOXIDE WASTEWATER

以山东某钛白粉厂二级压滤出水为研究对象,通过自主设计的中试设备考察了催化臭氧氧化工艺与NaClO工艺对钛白粉废水处理情况,确定催化臭氧氧化的最佳工艺实验条件为:在室温条件下,催化臭氧氧化反应时间为60 min,臭氧投加浓度为125 mg/L。对原有NaClO工艺进行优化,优化后的最佳工艺为:NaClO投加量为1.2%,反应时间为30 min。当平均进水ρ(COD)与ρ(NH_(3)-N)分别为109.7,12.8 mg/L,则催化臭氧工艺平均出水ρ(COD)与ρ(NH_(3)-N)分别为43.5,3.8 mg/L,平均去除率分别为60%和70.4%,NaClO工艺平均出水ρ(COD)与ρ(NH_(3)-N)分别为49.8,4.7 mg/L,平均去除率分别为54.5%和63.1%。在30 d内,催化臭氧氧化出水达标率为100%,NaClO出水达标率为26.7%,催化臭氧氧化处理费用为1.12元/t,NaClO处理费用为12元/t,催化臭氧氧化工艺相较于NaClO氧化工艺更适用于处理钛白粉废水。

Taking the secondary pressure filtration water from a titanium dioxide plant in Shandong as the research object,the catalytic ozonation process and the treatment of titanium dioxide wastewater were investigated through a self-designed pilot plant,and the best experimental conditions for catalytic ozonation process were determined as follows:at room temperature,the catalytic ozone oxidation reaction time was 60 min,and the ozone concentration was 125 mg/L.The original NaClO process was also optimized,and the best process after optimization was as follows:NaClO dosage was 1.2%,and the reaction time was 30 minutes.When the average influent COD and ammonia nitrogen were 109.7 mg/L and 12.8 mg/L,the average effluent COD and ammonia nitrogen of the catalytic ozone process were 43.5 mg/L and 3.8 mg/L,respectively,and the average removal rates were 60%and 70.4%,respectively;and the average effluent COD and ammonia nitrogen in the NaClO process were 49.8 mg/L and 4.7 mg/L,respectively,and the average removal rates were 54.5%and 63.1%,respectively.Within 30 days,the standard-meeting rate of the catalytic ozonation process effluent was 100%,and that of the NaClO process effluent was 26.7%;the running cost of catalytic ozonation ton water treatment was RMB 1.12/t,and that of the NaClO treatment was RMB 12/t.The catalytic ozonation process was more suitable for treating titanium dioxide wastewater,compared with The NaClO oxidation process.