摘要
天然沸石具有较大的孔隙率和比表面积,对氨氮有较强的选择性离子交换能力。运用天然沸石曝气生物滤池处理城市污水厂二级生化出水,结果表明,曝气生物滤池有良好的去除效果。在气水比为3∶1,水力负荷为1 m/h,温度>20℃情况下,沸石曝气生物滤池对城市污水厂二级生化出水COD去除率为12.7%,NH3-N去除率为96.6%;试验系统沿程微生物活性和微生物量呈现逐渐下降趋势,而单位生物量的生物活性沿程分布则与此相反;曝气生物滤池对水中污染物的去除主要集中在底部进水端部分,当水流达到距进水端上方105 cm时,曝气生物滤池对水中NH3-N的去除率已达86.8%(占氨氮总去除率的90%),COD的去除率为13.3%(占COD总去除率的67%)。
Natural zeolite has high porosity, large specific surface area and large selective ion exchange capacity for ammonia. A biological aerated filters （BAF） reactor for secondary effluent was conducted. The results show that, when the ratio of gas to liquid was 3：1, the hydraulic loading was 1 m/h, temperature varied from 20℃ to 25℃, 12.7% of COD and 96.6% of ammonia nitrogen（NH3-N） were removed. Microbial activity and biomass in the BAF reactor were in a regular pattern of gradient distribution from the lower to the upper along the direction of water flow; the contaminants were removed mainly in the bottom part, 86.6% of NH3-N （90% of removed NH3-N） and 13.3% of COD （67% of removed COD） were removed when the water flowed 105 cm filter media.
出处
《环境污染治理技术与设备》
CSCD
北大核心
2006年第9期88-93,共6页
Techniques and Equipment for Environmental Pollution Control
基金
国家"863"高技术研究发展计划资助项目(2003AA601080)
关键词
沸石曝气生物滤池
天然沸石
微生物活性
比氧呼吸速率
微生物量
硝化强度
biological aerated filter （BAF）
natural zeolite
microbial activity
specific oxygen uptakerater （SOUR）
microbial biomass
intensity of nitrification
