摘要
研究了自然通风生物滴滤池内浮石、聚氨酯两种填料的挂膜特性,考察不同工况下的污水净化规律。结果表明,浮石填料在生物滴滤池内的挂膜效果更好,挂膜成功后对COD、NH+4-N均有较好的去除效果,去除率大都分别达到70%～85%、60%～80%,且小粒径浮石比大粒径浮石的去除效果更佳。聚氨酯填料在第9天挂膜成功,大粒径聚氨酯填料对COD的去除效果略好于小粒径聚氨酯填料,挂膜成功后两者对COD的去除率均可以达到60%～80%,而对NH+4-N的去除效果较差,去除率仅达到10%～40%。浮石填料生物滴滤池对TN、TP的去除率较好,当水力负荷为0.85m3/(m2·d)时,TN、TP去除率分别为45.58%、38.44%,而聚氨酯填料生物滴滤池对TN、TP的去除率较差。浮石在挂膜生物量上占优势,聚氨酯的孔径较大,污水流经时停留时间较短,使得微生物不易附着其上。
The film-forming characteristic of pumice and polyurethane packings in natural ventilation bio-trick- ling filter was investigated and compared. The COD, NH＋-N removal efficiency of bio-trickling filter during film- forming process as well as the TN,TP removal regular after film-forming were analyzed. The experimental results showed that pumice packing hanging membrane much easier. The pumice packing with diameter of 6-12 mm achieved better treatment efficiency than that of 12-20 mm pumice packing,while for polyurethane packing,the performance of large size packing （50 mm） was slightly better than the small ones （25 mm）. After bio-film forming, the COD, NH4＋-N removal rates of pumice packing were 70%-85%, 60%-80% respectively, while for polyurethane packing, COD, NH4＋-N removal rates were 60%-80%, 10%-40% respectively. The bio-trickling filter filled with pumice pack- ing presented perfect performance on TN,TP removal,under the hydraulic load of 0.85 m3/（m2· d）,the TN,TP re- moval rate reached 45.58 %, 38.44% respectively, while the effectiveness of polyurethane packing filter was relative poor. The large aperture of polyurethane packing shortened the residence of sewage flow in filter, thus limited the at- tachment of microorganisms on packing.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2014年第8期59-63,68,共6页
Environmental Pollution & Control
关键词
生物滴滤池
填料
自然通风
挂膜
biological trickling filters
packing
natural ventilation
film-forming
