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采用缺氧/厌氧/微氧/好氧生物工艺处理15 000 m3/d氮肥化工企业废水,对不额外投加碳源条件下的运行效能进行了分析。COD、氨氮和总氮污泥负荷分别为0.02~0.07 kgCOD/(kgMLSS·d)、0.01~0.04 kgNH3-N/(kgMLSS·d)和0.02~0.05 kgTN/(kgMLSS·d),其去除率基本稳定在65%、90%和56%以上,出水水质满足国家和地方标准限值要求。控制微氧池DO为0.6 mg/L、pH值为7.8,亚硝酸盐积累率达到48%,将混合液回流比提高至150%,处理系统具有短程硝化反硝化运行特征。能耗检测和分析表明,该工艺吨水和COD比能耗分别达到0.43kW·h/m3和1.51 kW·h/kg,氨氮和总氮比能耗分别为3.43 kW·h/kg和2.94 kW·h/kg,可实现低能耗生物脱氮运行。
Anaerobic / anaerobic / micro / aerobic biological treatment of 15 000 m3 / d nitrogen fertilizer chemical plant wastewater was carried out, and the operating efficiency under no additional carbon source was analyzed. The COD, ammonia nitrogen and total nitrogen sludge loads were 0.02-0.07 kgCOD / (kgMLSS · d), 0.01-0.04 kgNH3-N / (kgMLSS · d) and 0.02-0.05 kgTN / (kgMLSS · d) respectively. The removal rates of COD, Stable at 65%, 90% and 56%, water quality to meet the national and local standards limit requirements. DO was 0.6 mg / L, pH value was 7.8, the nitrite accumulation rate was 48% and the reflux ratio of the mixture was increased to 150%. The treatment system had the characteristics of short-range nitrification and denitrification. Energy consumption testing and analysis showed that the specific energy consumption per ton of water and COD reached 0.43 kW · h / m3 and 1.51 kW · h / kg respectively, and the specific energy consumption of ammonia nitrogen and total nitrogen were 3.43 kW · h / kg and 2.94 kW respectively · H / kg, to achieve low-energy biological nitrogen removal operation.