Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, PR China.
J Hazard Mater. 2012 Oct 15;235-236:78-84. doi: 10.1016/j.jhazmat.2012.07.012. Epub 2012 Jul 10.
As a typical industrial wastewater, coal gasification wastewater has poor biodegradability and high toxicity. In this paper, a laboratory-scale anaerobic-anoxic-oxic membrane reactor (A(2)O-MBR) system was developed to investigate the treatment ability of coal gasification wastewater. The removal capacity of each pollutants used in this system were determined at different hydraulic residence times (HRT) and mixed liquor recycle ratios (R). The experimental results showed that this system could effectively deal with COD and phenol removal and remain in a stable level when the operational parameters altered, while the nitrification was sensitive to operational conditions. The best performance was obtained at HRT of 48 h and R of 3. The maximum removal efficiencies of COD, NH(4)(+)-N and phenols were 97.4%, 92.8% and 99.7%, with final concentrations in the effluent of 71 mg/L, 9.6 mg/L and 3 mg/L, respectively. Organics degradation and transformation were analyzed by GC/MS and it was found that anaerobic process played an important role in degradation of refractory compounds.
作为一种典型的工业废水，煤气化废水的可生化性差、毒性高。本文采用实验室规模的厌氧-缺氧-好氧膜生物反应器（A(2)O-MBR）系统来研究煤气化废水的处理能力。在不同水力停留时间（HRT）和混合液回流比（R）下，确定了该系统对各种污染物的去除能力。实验结果表明，该系统在操作参数改变时，能够有效地去除 COD 和苯酚，并保持稳定水平，而硝化作用对操作条件敏感。在 HRT 为 48 h 和 R 为 3 时，系统性能最佳。COD、NH(4)(+)-N 和苯酚的最大去除效率分别为 97.4%、92.8%和 99.7%，出水浓度分别为 71 mg/L、9.6 mg/L 和 3 mg/L。通过 GC/MS 对有机物的降解和转化进行了分析，结果表明，厌氧过程对难降解化合物的降解起着重要作用。
