盐析凝胶-电催化氧化法处理水射流磨料生产废水试验研究

Study on Treatment of Wastewater from Plastic Water-jet Abrasive Production by Salting-out-gel Method-elcetrocatalytic Oxidation Technology

采用盐析凝胶法对废水中的PVA加以回收,并对盐析凝胶后废水进行Fenton处理。考察了Na_(2)SO_(4)、Na_(2)B_(4)O_(7)·10H_(2)O投加量、pH、温度、反应时间等因素对PVA回收效果的影响;同时研究了电催化氧化氧化过程中反应时间、槽电压、初始pH、极板间距、通气量等因素的作用效果。结果表明,盐析凝胶-Fenton氧化法可以有效的回收废水中的聚乙烯醇,并能高效的降解废水中的有机物。在最佳条件下,即室温,pH为4.0,投加Na_(2)SO_(4)15 g/L,Na_(2)B_(4)O_(7)·10H_(2)O2.5 g/L,反应60 min,废水中PVA回收率可达88.78%;在此基础上,电催化氧化进一步处理使得废水中的PVA降至123.61 mg/L,COD降至1143.93 mg/L,后续需做进一步处理。

The salting-out-gel method was adopted for recovwering polyvinyl alcohol soluted in wastewater from plastic water-jet abrasive production and elcetrocatalytic oxidation technology was used for the treatment of wastewater treated by salting-out-gel method.The effects of factors including dosages of Na_(2)SO_(4) and Na_(2)B_(4)O_(7)·10H_(2)O,pH value,reaction time and reaction temperature on PVA recovery efficiency were investigated.Meanwhile,reaction time,electrolyzer voltage,pH value,electrodes gap,and ventilation volume ware studied as key factors in the elcetrocatalytic oxidation processes.The results showed that combination technologies not only effectively recovered polyvinyl alcohol,but also degraded organic pollutants.The optimal operational condition was determined as follows:at room temperature,the mass concentration of Na_(2)SO_(4) and Na_(2)B_(4)O_(7)·10H_(2)O was 15 g/L and 2.5 g/L respectively,the initial pH value of the wastewater was adjusted to 4.0 and reaction time was 60 min.Under the optimum operational condition,PVA recovery efficiency reached 88.78%.On this basis,further oxidation by Elcetrocatalytic oxidation made polyvinyl alcohol reduced to 123.61 mg/L and waste water COD reduced to 1143.93 mg/L.