微氧生化-生物接触氧化法对癸二酸废水的处理特性研究

Study on the treatment characteristics of sebacic acid wastewater by micro-oxygen biochemical and biological contact oxidation

癸二酸废水属于典型难降解工业废水,废水处理难度大,且富含的高硫酸盐极易被还原为硫化氢释放,导致环境污染。采用微氧生化-生物接触氧化工艺处理癸二酸废水,考察其对难降解工业废水的处理特性。结果表明,当进水负荷逐渐趋于稳定,在进水COD 4500~5500 mg/L、挥发酚150~200 mg/L的情况下,经微氧生化-生物接触氧化工艺处理后,出水COD<400 mg/L,挥发酚<0.5 mg/L。系统中出水硫化物质量浓度均低于0.2 mg/L,表明系统内不易产生H2S。在微氧段构建及启动阶段,伴随着DO升高,出水浊度不断降低;当整体工艺连续稳定运行时,系统除浊率保持在70%~90%之间,表明整体工艺对降低出水浊度有很好的效果。系统中MLSS 6000~8000 mg/L,SVI 100~150 mL/g,表明系统中污泥沉降性较好。系统运行稳定性评价表明系统具有较强的抗负荷冲击能力和耐盐度变化能力,可广泛应用于难降解工业废水的治理中。

Sebacic acid wastewater is a typical industrial wastewater that is difficult to degrade,and the high sulfate rich in sebacic acid water is easy to be reduced to hydrogen sulfide release,leading to environmental pollution.The micro-oxygen biochemical coupling biological contact oxidation process was applied to treat sebacic acid wastewa-ter,and the treatment characteristics of refractory industrial wastewater was investigated.The results showed that when the influent load gradually tended to be stable with COD of 4500-5500 mg/L and volatile phenol of 150-200 mg/L,the effluent COD was less than 400 mg/L and the volatile phenol was less than 0.5 mg/L after treating by micro-oxygen biochemical and biological contact oxidation process.The mass concentration of sulfide in effluent was lower than 0.2 mg/L,indicating that H2S was not easily produced in micro-oxygen biochemical and biological contact oxidation process.During the construction and start-up stage of the micro-oxygen section,the turbidity of the effluent decreased with the increase of DO concentration.The turbidity removal rate of the system was maintained between 70%and 90%when the overall process ran continuously and stably,indicating that the overall process played an important role in reducing the turbidity of the effluent.MLSS of 6000-8000 mg/L and SVI of 100-150 mL/g in the system indicated that sludge settling ability was good.The stability evaluation of the system showed that the system had strong ability to withstand load shock and salinity change,it could be widely used in the treatment of refractory industrial wastewater.