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以TNT为目标污染物,考察了M n(II)催化臭氧化作用机理,以及HCO3-、pH值和催化剂投量及投加方式对催化效果的影响。结果表明,M n(II)对臭氧化TNT的催化作用明显。对于一定量的催化剂,一次性投加比多次投加时的催化效果好,催化剂的浓度为0.106m o l/L、pH值约为5时效果比较理想,废水溶液的HCO3-质量浓度为58.1m g/L或290.5m g/L时,对催化效果几乎没有影响。在催化氧化过程中,COD的去除率明显小于TNT,且TNT浓度减小与硝酸盐浓度增加的比例为1∶1,说明TNT降解不彻底。M n(II)催化臭氧化过程中产生的水合二氧化锰使胶体表面及溶液-胶体界面增加。臭氧和TNT富集,TNT的氧化分解易于发生。
Taking TNT as the target pollutant, the catalytic ozonation mechanism of M n (II) and the effect of HCO3-, pH value, catalyst dosage and dosage method on the catalytic effect were investigated. The results showed that the catalytic effect of M n (II) on ozonized TNT was obvious. For a certain amount of catalyst, the one-time dosing is better than the one with multiple dosing. The concentration of catalyst is 0.106mol / L and the pH value is about 5, the HCO3- concentration of wastewater solution is 58.1mg / L or 290.5mg / L, the catalytic effect has almost no effect. In the catalytic oxidation process, COD removal rate was significantly less than TNT, and TNT concentration and nitrate concentration increased ratio of 1: 1, indicating that TNT degradation is not complete. M n (II) catalyzes the formation of hydrated manganese dioxide during ozonation which increases the colloidal surface and the solution-colloidal interface. Ozone and TNT enrichment, oxidative decomposition of TNT prone to.