短程硝化反硝化工艺处理低C/N垃圾渗滤液

针对本试验垃圾渗滤液的水质特点和传统生物脱氮工艺存在的问题,结合目前国内外在该方向的研究现状,提出短程硝化反硝化处理垃圾渗滤液的新工艺。通过控制曝气池内溶解氧浓度平均在2.0 mg/L,温度(30±2)℃,实现了稳定的亚硝氮积累和较高的氨氮去除率,亚硝化率和氨氮去除率分别维持在83%和85%左右。试验结果表明,该工艺与传统生物脱氮工艺相比,污泥负荷明显增加,耗氧量和反硝化所需碳源减少,反硝化效率和速率明显提高,从而总氮去除率也显著提高。

TREATMENT OF LOW C/N LANDFILL LEACHATE BY PROCESS OF SHORT-RANGE NITRIFICATION-DENITRIFICATION

As to the characteristics of landfill leachate and some problems in the traditional process of biologic nitrogen removal,combined with research conditions at the present both at home and abroad,it is put forward a new process that can treat landfill leachate with short-range nitrification-denitrification.The nitrite accumulation and ammonia removal rate have been performed steadily by controlling average dissolved oxygen concentrations of 2.0 mg/L and temperature of(30±2)℃ in the nitrifying activated sludge reactor,and nitrite accumulation rate NO~-_2-N/(NO~-_2-N+NO~-_3-N)] and ammonia removal rate can be maintained at 83% and 85%,respectively.The results of the experimentation indicate that as compared with traditional process of biologic nitrogen removal,the process has obvious higher sludge load rate,lower oxygen consumption and carbon requirement as well as a higher efficiency and velocity of denitrification,and so it has a higher TN removal rate accordingly.