电催化还原脱毒预处理丙烯酸盐废水

Detoxification Pretreatment of Acrylate Wastewater by Electrocatalytic Reduction Process

丙烯酸盐生物降解性好,但毒性较高,为解决含丙烯酸盐废水难以进行高负荷厌氧生物处理的问题,采用电催化还原技术预处理高浓度丙烯酸盐废水,考察了初始ρ（丙烯酸盐）、电流、废水pH、温度、ρ（对甲基苯磺酸盐）等对丙烯酸盐转化的影响.结果表明：初始ρ（丙烯酸盐）、废水pH、电流对丙烯酸盐电催化还原为丙酸盐的过程影响较大,而废水温度和ρ（对甲基苯磺酸盐）的影响较小.当废水初始ρ（丙烯酸盐）由5.0 g/L升至20.0～60.0 g/L时,丙烯酸盐转化速率由30.1 g/（L·h）升至51.9～54.6g/（L·h）,能耗下降近50%;随着操作电流从0.25 A升至2.00 A,丙烯酸盐转化速率由9.5 g/（L·h）线性增至85.1 g/（L·h）,电流效率略有降低,能耗由2.0 W·h/g增至5.2 W·h/g;pH由2升至4时,能耗由6.6 W·h/g降至3.4 W·h/g;废水温度在30～50℃范围内、ρ（对甲基苯磺酸盐）在0～8.0 g/L范围内时,对丙烯酸盐的转化影响较小.研究显示,在优化工艺条件（电流为1.00 A、废水pH为5、温度为30℃）下,电催化还原处理实际丙烯酸丁酯废水,电流效率达90%以上.

Acrylate is biodegradable but highly toxic. As a result,acrylate-containing wastewater is difficult to treat with anaerobic biological methods at high loads. High-concentration acrylate wastewater was pretreated by an electrocatalytic reduction process. The effects of initial acrylate concentration,current,pH,temperature and p-toluene sulfonate concentration on the process were investigated.The process was affected significantly by initial acrylate concentration,current and pH,while there were less effects of temperature and ptoluene sulfonate concentration on the performance. When the acrylate concentration increased from 5. 0 g/L to 20. 0-40. 0 g/L,the transformation rate of acrylate increased from 30. 1 to 51. 9-54. 6 g/（ L·h） and energy consumption decreased by nearly 50%. When the current increased from 0. 25 to 2. 00 A,the transformation rate of acrylate increased linearly from 9. 5 to 85. 1 g/（ L·h）,while current efficiency decreased slightly and energy consumption increased from 2. 0 to 5. 2 W·h/g. When pH of the wastewater increased from2 to 4,energy consumption decreased from 6. 6 to 3. 4 W·h/g. Fewer effects were detected on the transformation of acrylate when the temperature changed in the range of 30-50 ℃ and p-toluene sulfonate concentration changed in the range of 0-8. 0 g/L. Under the optimized process conditions（ current 1. 00 A,pH 5 andtemperature 30 ℃）,the current efficiency of actual butyl-acrylate wastewater was above 90%.