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
2016
Zhuang, Haifeng | Han, Hongjun | Shan, Shengdao
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.
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