摘要
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,NH_4^+-N去除率、NO_2^--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NH_4^+-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28.0~32.7 h、1.0~1.5 mg/L和4~8,此时NH_4^+-N去除率、NO_2^--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 nitrogen 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 nitrogen removal in 29 d of cultivation time. The NH_4~＋-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 NH_4~＋-N with the technology of shortcut simultaneous nitrogen removal efficiently and steadily,hydraulic 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 NH_4~＋-N removal rate,cumulative NO-2-N rate and simultaneous nitrification-denitrification rate respectively reached to 98.1%,81.2% and 76.1%.
出处
《煤炭科学技术》
CAS
北大核心
2017年第9期209-214,共6页
Coal Science and Technology
基金
国家高技术研究发展计划(863计划)资助项目(2015AA050501)
关键词
煤气化废水
短程硝化
生物载体
脱氮
coal gasification wastewater
shortcut nitrification
bio-carrier
nitrogen removal
