电催化氧化去除制革废水生物处理出水中氨氮的研究

采用电催化氧化强化去除制革废水生化工艺处理出水中的NH3-N,在利用钛电极对制革废水进行连续电催化氧化处理时,考察HRT及电流密度对处理效果的影响。结果表明:随着HRT的延长及电流密度的增大,NH3-N的去除效果增强,当HRT设定为0.25 h,电流密度为20 mA/cm2时,出水NH3-N的质量浓度为36.67 mg/L,相应的去除率为38.74%,可达到CJ 343—2010《污水排入城镇下水道水质标准》中规定的NH3-N排放浓度的要求,此时,水处理电耗为2.16 kW·h/m3。电催化氧化技术能够对制革废水生化工艺处理出水中的NH3-N实现稳定有效地去除,具有一定的应用前景。

Study on ammonia nitrogen removal from effluent water of biological treated leather wastewater by electrolytic oxidization

Using electrocatalytic oxidation to enhance the NH3-N removal from effluent water of biological treated leather wastewater, the influence of HRT and current density on the effect of leather wastewater treatment by continuous electrocatalytic oxidation with titanium electrode was investigated. The results showed that： with the extension of HRT and the increasing of current density, the removal effect of NH3-N was enhanced; when the HRT was 0.25, the current density was 20 mA/em2, the mass concentration of NH3-N in the effluent water was 36.67 mg/L with a removal rate of 38.74%, which indicated that, the effluent water quality could meet the re- quirement about discharge concentration of NH3-N in CJ 343--2010 Discharge standard for municipal sewerage system; meanwhile, the energy consumption when treating a ton of water was 2.16 kW.h/m3. It could draw a con- clusion that, electroeatalytic oxidation process could remove NH3-N from effluent water of biological treated leather wastewater effectively and stably, which had certain application value.