摘要
针对焚烧垃圾渗滤液水质的多变性,为了在C/N值较低的情况依旧能够有效脱除总氮,提出了以厌氧/好氧/兼氧/厌氧为基础的大比例回流的短程硝化反硝化工艺,对焚烧垃圾渗滤液进行预处理。通过中试研究了该工艺的可行性,并通过监测水质及污泥浓度的沿程变化规律,分析了对污染物的去除机理。结果表明,通过控制各反应池的DO浓度及出水的回流比,实现亚硝态氮的积累和稳定的反硝化是可行的,且系统pH值能够稳定在7～8.5之间。系统最佳的HRT为2.9 d,此时出水COD、氨氮及总氮分别为778.1、15和136.9 mg/L,去除率分别为70.3%、96.6%和69.6%,亚硝化率为92.9%。污染物的去除主要发生在第一级厌氧池中,且以吸附去除为主;微生物的同化作用与增殖主要发生在兼氧池中。污泥回流确保了第一级厌氧池具有较高的污泥量与较好的处理效果。
The quality of leachate from municipal solid waste incineration plant is variable. In order to efficiently remove TN at low C/N ratio, a shortcut nitrification-denitrification process with large return ratio in anaerobic, aerobic, facuhative and anaerobic reactors was proposed to treat the leachate. The feasibility of the process was investigated in pilot test, and the removal mechanisms of pollutants were analyzed by monitoring the variations of effluent quality and MLSS in each reactor. The accumulation of nitrite and stable nitrification-denitrification could be achieved by controlling DO and reflux ratio of effluent from each reactor. At the optimal pH of 7 to 8.5 and optimal HRT of 2.9 d, the effluent concentrations of COD, ammonia nitrogen and total nitrogen were 778.1 mg/L, 15 mg/L and 136.9 mg/L respectively, the corresponding removal rates were 70.3% , 96.6% and 69.6% respectively, and the nitrosation rate was 92.9%. The pollutants were mainly removed by adsorption in the first-stage anaerobic reactor. The assimilation and proliferation of microorganisms mainly happened in the facultative reactor. The return of sludge enabled the first-stage anaerobic reactor to achieve a high sludge volume and good removal efficiency.
出处
《中国给水排水》
CAS
CSCD
北大核心
2012年第19期28-32,共5页
China Water & Wastewater
基金
国家自然科学基金资助项目(51078149)
关键词
短程反硝化
焚烧垃圾渗滤液
回流
亚硝化
总氮
shortcut denitrification
leachate from waste incineration
return
nitrosation
total nitrogen
