煤化工高盐废水电催化氧化中试研究

Pilot test study onusing electrocatalytic oxidation technology to deal with high-salinity wastewater from coal chemical process

以某煤化工污水处理厂产生的高盐废水为研究对象,开展电催化氧化(Electrocatalytic oxidation,ECO)中试试验研究。考察反应时间对去除高盐废水中化学需氧量和氨氮的效果以及对氧化还原电位和pH的影响。在进水COD为821.4 mg/L的条件下,电催化氧化对水中COD和NH3-N的去除率分别为62.5%和54.58%,出水中的氧化还原电位可以提升323%,出水pH从9.93下降至3.87。当反应75 min后出水COD为308 mg/L,此时电催化氧化的效率保持在22.7%。试验结果表明,电催化氧化可以同时去除COD和氨氮。反应时间75min时产水COD可以满足后续工艺进水的要求,为后续处理工艺创造有利条件。

This study was based on the electrocatalytic oxidation(ECO)technology to develop a pilot testing of dealing with high-salinity wastewater from coal chemical industry.The effect of reaction time on chemical oxygen demand(COD)and ammonia nitrogen(NH3-N)removal,as well as Oxidation-Reduction Potential(ORP)and pH value in high-salt wastewater were investigated.When the influent COD was 821.4 mg/L and the reaction time was75 min,the removal rate of COD and NH3-N was 62.5%and 54.58%,respectively,the ORP value was improved to 323%,and the pH value fell from 9.93 to 3.87.At the same time,after 75min,the effluent COD was 308 mg/L and the efficiency of ECO maintained at 22.7%.The results showed that ECO can simultaneously remove COD and NH3-N from high-salinity wastewater.When the reaction time was 75min,the effluent COD can meet the requirements of subsequent process inlet,which will benefit the subsequent process.