O3-MBR法深度处理煤气废水

Advanced Treatment of Coal Gasification Wastewater by Ozonation Combined with Membrane Bioreactor Process

    摘要
  • 摘要: 以经多级生物处理后的煤气废水为原水，采用O3-MBR组合工艺对其进行深度处理，以满足回用要求.结果表明：采用臭氧氧化工艺，当废水pH为11和臭氧投加量〔ρ(臭氧)〕为189.2 mg/L时，CODCr和色度的去除率分别为46.5%和80.2%，ρ(BOD5)/ρ(CODCr)由0.02升至0.29，废水的可生化性得到明显改善；臭氧氧化工艺出水再通过MBR作进一步处理，CODCr，NH3-N和色度的去除率分别达23.0%，76.3%和70.0%，且出水水质稳定；总体上，废水经O3-MBR组合工艺处理，CODCr，NH3-N，色度和浊度的平均总去除率分别达到58.7%，76.3%，88.6%和95.1%；处理后出水的ρ(CODCr)<50 mg/L，ρ(NH3-N)<5 mg/L，浊度<0.2 NTU，色度约为30度，出水水质满足生产工艺回用的要求.

     

    Abstract: In order to meet the requirements of industrial recycling,an ozonation and membrane bioreactor (O3-MBR) combined process was used to further deal with the effluent of coal gasification wastewater,which had been treated by a multi-stage biological process.The experimental results showed that 80.2% of the colority and 46.5% of CODCr in the wastewater were removed by using an ozone dosage of 189.2 mg/L at initial pH 11,and the ρ(BOD5)/ρ(CODCr) ratio increased from 0.02 to 0.29 at the ozonation process.In order to ensure stable water quality,MBR was used after the ozonation process for further treatment,and the removal efficiencies of CODCr,NH3-N and colority reach 23.0%,76.3% and 70.0% respectively.Overall,the stable effluent quality could be ensured by the O3-MBR combined process,and the average removal efficiencies for CODCr,NH3-N,colority and turbidity were 58.7%,76.3%,88.6% and 95.1% respectively.Moreover,turbidity,ρ(CODCr) and ρ(NH3-N) concentrations of the final effluent were less than 0.2 NTU,50 mg/L and 5 mg/L,respectively,and the colority was about 30 Pt-Co unit.The effluent quality of treated wastewater could meet the requirements for reuse as the cooling make-up water or other purposes.

     

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