电化学氧化法预处理超高盐榨菜腌制废水

鉴于超高盐榨菜腌制废水导电性良好,采用电化学氧化法进行预处理(阳极为Ti基RuO₂-TiO₂-IrO₂-SnO₂网状涂层形稳电极),考察初始pH、电流密度、电解时间和极板间距对COD_Cr和氨氮去除率的影响,并探讨该过程中有机物相对分子量的变化规律.结果表明,在电流密度156 mA/cm2、极板间距1.5 cm、初始pH 4.3~5.0、电解时间120 min时,COD_Cr和氨氮去除率较佳,分别为55.74%和99.77%.出水pH升至9.54,盐度由7.0%降至6.4%,大分子有机物转化为小分子有机物,对后续生物处理有利. 

Electrochemical Oxidation for Hypersaline Pickle Wastewater Pretreatment

The electrochemical oxidation method was applied to treat hypersaline pickle wastewater with a RuO2-TiO2-IrO2-SnO2/Ti dimensionally stable electrode used as the anode.The effects of initial pH,current density,reaction time and electrode distance on the removal rates of CODCr and ammonia were investigated,and variability of the molecular weights of the organics was also studied.Under the optimal conditions with initial pH of 4.3-5.0,current density of 156 mA/cm2 and electrode distance of 1.5 cm,removals of CODCr and ammonia were 55.74% and 99.77% respectively within 120 min.In addition,as the pH increased to 9.54,the salinity decreased from 7.0% to 6.4% and macromolecular organics were converted into small organics,which were helpful to the following biological treatment.