State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
J Environ Sci (China). 2010;22(12):1868-74. doi: 10.1016/s1001-0742(09)60327-2.
Coal gasification effluent is a typical refractory industrial wastewater with a very poor anaerobic biodegradability due to its toxicity. Methanol was introduced to improve anaerobic biodegradability of real coal gasification wastewater, and the effect of methanol addition on the performance was investigated in a mesophilic upflow anaerobic sludge bed reactor with a hydraulic retention time of 24 hr. Experimental results indicated that anaerobic treatment of coal gasification wastewater was feasible with the addition of methanol. The corresponding maximum COD and phenol removal rates were 71% and 75%, respectively, with methanol concentration of 500 mg COD/L for a total organic loading rate of 3.5 kg COD/(m3 x day) and a phenol loading rate of 0.6 kg/(m3 x day). The phenol removal rate was not improved with a higher methanol concentration of 1000 mg COD/L. Substrate utilization rate (SUR) tests indicated that the SURs of phenol were 106, 132, and 83 mg phenol/(g VSS x day) at methanol concentrations of 250, 500, and 1000 mg COD/L, respectively, and only 45 mg phenol/(g VSS x day) in the control reactor. The presence of methanol could reduce the toxicity of coal gasification wastewater and increase the biodegradation of phenolic compounds.
煤气化废水是一种典型的难生物降解的工业废水，由于其毒性，其厌氧生物降解性很差。甲醇的引入可以改善实际煤气化废水的厌氧生物降解性，在水力停留时间为 24 小时的中温上流式厌氧污泥床反应器中考察了甲醇添加对性能的影响。实验结果表明，在添加甲醇的条件下，煤气化废水的厌氧处理是可行的。当甲醇浓度为 500mgCOD/L，总有机负荷为 3.5kgCOD/（m³·d），苯酚负荷为 0.6kg/（m³·d）时，对应的最大 COD 和苯酚去除率分别为 71%和 75%。当甲醇浓度为 1000mgCOD/L 时，苯酚去除率没有提高。基质利用速率（SUR）试验表明，在甲醇浓度分别为 250、500 和 1000mgCOD/L 时，苯酚的 SUR 分别为 106、132 和 83mg 苯酚/（gVSS·d），而在对照反应器中仅为 45mg 苯酚/（gVSS·d）。甲醇的存在可以降低煤气化废水的毒性，增加酚类化合物的生物降解性。
