高级氧化工艺预处理乙腈生产废水

Pretreatment of Acetonitrile Production Wastewater by AOPs

以COD_(Cr)、TN为评价指标,探究不同高级氧化工艺预处理乙腈废水的最佳条件,并对比各工艺的处理效果和优缺点,为工程实践提供指导。结果表明,铁碳微电解的最佳条件是pH值为4、铁碳填料投加量为1500g/L,2h内COD_(Cr)、TN去除率约为31.87%、38.84%;芬顿氧化的最佳条件是pH值为5、H_(2)O_(2),投加量为20mL/L、Fe^(2+)/H_(2)O_(2)摩尔比为1:5,2h内COD_(Cr)、TN去除率约为58.97%、62.62%;铁碳微电解-芬顿耦合工艺的COD_(Cr)TN去除率可达60.70%、66.52%;pH值为7条件下,臭氧氧化2h内COD_(Cr)、TN去除率约为63.80%、61.97%,连续反应24h后可达约96.70%、94.12%。考虑成本和能耗,采用单独芬顿工艺或短时间的臭氧氧化工艺处理乙腈废水的性价比较高。

Taking COD_(Cr) and TN as evaluation indices,the optimal conditions for the pretreatment of acetonitrile wastewater by dfferent advanced oxidation processes were explored,and the treatment effects,advantages and disadvantages of each process were compared,which provided guidance for engineering practice.The results showed that the optimal conditions for iron-carbon micro-electrolysis were pH value was 4,iron-carbon filler dosage was 1500 g/L,and the removal rates of COD_(Cr) and TN within 2 hours were 31.87%and 38.84%.The optimal conditions of Fenton oxidation were pH value was 5,H_(2)0_(2) dosage was 20 mL/L,molar ratio of Fe^(2+)/H_(2)O_(2) was 1:5,COD_(Cr) and TN removal rates of 58.97%and 62.62%were achieved in 2 h.The removal rates of COD_(Cr) and TN by iron-carbon micro-electrolysis-Fenton coupled process could reach 60.70%and 66.52%.Under the condition of pH value was 7,the removal rates of C0D_(Cr) and TN were 63.80%and 61.97%within 2 h of ozone oxidation,and 96.70%and 94.12%after continuous reaction for 24 h.Considered the cost and energy consumption,it was more cost-effective to treat acetonitrile wastewater by Fenton process alone or ozone oxidation in a short time.