Treatment of real coal gasification wastewater using a novel integrated system of anoxic hybrid two stage aerobic processes: performance and the role of pure oxygen microbubble

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• 作者：Haifeng Zhuang ; Hongjun Han ; Shengdao Shan
• 刊名：Environmental Science and Pollution Research
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：23
• 期：12
• 页码：11916-11926
• 全文大小：791 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499
• 卷排序：23

文摘

A novel integrated system of anoxic-pure oxygen microbubble-activated sludge reactor-moving bed biofilm reactor was employed in treatment of real coal gasification wastewater. The results showed the integrated system had efficient performance of pollutants removal in short hydraulic retention time. While pure oxygen microbubble with the flow rate of 1.5 L/h and NaHCO₃ dosage ratio of 2:1 (amount NaHCO₃ to NH₄+-N ratio, mol: mol) were used, the removal efficiencies of COD, total phenols (TPh) and NH₄+-N reached 90, 95, and 95 %, respectively, with the influent loading rates of 3.4 kg COD/(m3 d), 0.81 kg TPh/(m3 d), and 0.28 kg NH₄+-N/(m3 d). With the recycle ratio of 300 %, the concentrations of NO₂−-N and NO₃−-N in effluent decreased to 12 and 59 mg/L, respectively. Meanwhile, pure oxygen microbubble significantly improved the enzymatic activities and affected the effluent organic compositions and reduced the foam expansion. Thus, the novel integrated system with efficient, stable, and economical advantages was suitable for engineering application.KeywordsCoal gasification wastewaterPure oxygen microbubbleInorganic carbonFoamEnzyme activities