Hangzhou Environmental Protection Research Institute, China Coal Technology & Engineering Group

为实现高氨氮煤气化废水的高效、低成本处理,采用短程同步脱氮工艺对煤气化废水进行了试验研究,分析了工艺启动过程、氮素转化特征和主要影响因素（水力停留时间、溶解氧、碳氮比）对脱氮效果的影响。结果表明:反应器在29 d的培养时间内快速完成了短程同步脱氮工艺启动,NH4+-N去除率、NO2--N累计率及同步硝化反硝化效率分别达到99.6%、81.3%、49.4%。为使反应器以短程同步脱氮的方式实现NH4+-N的稳定高效去除,水力停留时间、溶解氧、碳氮比宜分别控制在28.032.7 h、1.01.5 mg/L和48,此时NH4+-N去除率、NO2--N累计率及同步硝化反硝化效率分别达到98.1%、81.2%、76.1%。

In order to treat coal gasification wastewater of high ammonia-nitrogen with high efficiency and low cost, the technology of shortcut simultaneous nitroge n removal was used to conduct an experiment. The factors on nitrogen removal effects by start-up procedure, nitrogen transformation characteristics and major factors ( hydraulic retention time, dissolved oxygen, carbon-nitrogen ratio) were analyzed. The results indicated that the reactor finished start-up of shortcut simultaneous nitroge n removal in 29 d of cultivation time. The NH4*-N removal rate, cumulative NO-2-N rate and simultaneous nitrification-denitrification rate respectively reached to 99.6%, 81.3% and 49.4%in the last phase of start-up procedure. To remove NH4*-N with the technology of shortcut simultaneous nitrogen removal efficiently and steadily, hydr aulic retention time, dissolved oxygen, carbon-nitrogen ratio should be controlled with 28.0 ~ 32.7 h、1.0~ 1.5 mg/L and 4 8. Under the optimum condition, the NH4*-N removal rate, cumulative NO-2-N rate and simultaneous nitrification-denitrification rate respectively reached to 98.1%, 81.2% and 76.1%.