生物栅净化富营养化水体的试验

A test of biological grid for treatment of eutrophied water bodies

采用生物栅技术处理上海市某一呈富营养化状态的河水。处理装置的9个廊道并联运行,连续进出水,平均每池处理水量为4.4 t/d。试验主要对比生物栅填料分别为球形填料、悬浮填料和组合填料时,对水体CODCr、SS、TN和TP等的去除效果,并分析了不同填料生物膜的微生物的数量变化。悬浮填料生物栅对CODCr、SS、TN、TP的去除率分别为33%～84%、42%～82%、6%～25%、15%～40%;组合填料生物栅分别为41%～79%、50%～93%、7%～28%、17%～44%;球形填料生物栅分别为34%～67%、34%～70%、5%～21%、10%～28%。结果表明组合填料生物栅和悬浮填料生物栅的污染去除效果优于球形填料。微生物测试结果表明,生物栅填料可以显著增加异养细菌特别是硝化细菌的数量,增强污染净化效果。

Biological grid technology was used to treat water from a eutrophied river in Shanghai. Nine ponds of treatment equipments were parallelly connected with continuous influent and effluent; the average amount of water treated by each pond was 4.4 t/d. Three kind of biological grids, carried with different fillers, global, suspended and compound one, were compared in removing CODCr, SS, TN and TP, and the changing of microorganism amount with different carrier biofilms were analysised at the same time. The results showed that, the removal rate of CODCr, SS, TN, TP by biological grid with suspended filler were 33%-84% , 42%-82% , 6%-25% , 15%-40% respectively; with compounded filler were 41%-79%, 50%-93%, 7%-28%, 17%-44% respectively; and with global filler were 34%-67% 34%-70%, 5%-21%, 10%-28% respectively. It indicated that, the pollution removal efficiency of biological grid with suspended and compound fillers were superior to that with global filler. The results of the microorganism test also showed that, biological grid filler could obviously increase the amount of heterotrophic bacteria, especially the amount of nitrobacteria, and improved the pollution removal effect.