外循环厌氧工艺处理鲁奇煤制气废水的研究

Treatment of Lurgi coal gasification wastewater in external circulation anaerobic process

摘要:

为了提高煤制气废水的厌氧处理能力,研究了实际工程中煤制气废水的外循环厌氧处理效果,并考察进水质量浓度、水力停留时间和投加甲醇对煤制气废水处理效能的影响.结果表明:煤制气废水的厌氧处理效率很低,进水COD和总酚质量浓度分别为1100mg/L和210mg/L时去除率分别为18.5%和20.3%,当进水COD质量浓度提高至2100mg/L时去除率分别为15.2%和25.5%.水力停留时间由24h延长至48h,COD和总酚去除率略有提高.投加甲醇控制COD含量为200～500mg/L,COD和总酚去除率分别提高至40.7%和35.2%.投加甲醇基质可以明显提高废水的厌氧处理效能,稀释作用或者延长水力停留时间的效果甚微.

Abstract:

To enhance the anaerobic treatability of Lurgi coal gasification wastewater ( LCGW),full-scale study on external circulation anaerobic treatment of LCGW was carried out and the effects of influent concentration,hydraulic retention time and methanol addition on the treatment efficiency were studied. Results indicated that the treatment efficiency of LCGW was very low and the removal efficiency of COD and total phenols were 18. 5% and 20. 3% with the influent COD and total phenols of 1 100 mg/L and 210 mg/L,respectively. When the influent COD increased to 2 100 mg/L,the removal efficiencies of COD and total phenols were 18. 5% and 20. 3% respectively. Prolonging the hydraulic retention time from 24 h to 48 h,the COD and total phenols removal increased slightly. The COD and total phenols removal increased to 40. 7% and 35. 2% respectively with the methanol addition of 200-500 mgCOD/L. The methanol addition can enhance anaerobic treatment efficiency obviously,but the effect of dilution or prolonged hydraulic retention time is slight.