固定化微生物-水生生物强化系统在前置库示范工程中的应用

在前置库中构建固定化微生物-水生生物强化系统处理太湖入湖河道污水,以减少入湖污染负荷.在驯化期加入复合微生物菌剂30 mg/kg,驯化期后每月投加1次(20 mg/kg),强化微生物的活性.监测期间(5-11月)库水进水ρ(TN)为0.54～1.59 mg/L,ρ(TP)为0.079～0.172 mg/L,ρ(COD_Mn)为5.41～13.40mg/L,前置库水力停留时间约为9 d,TN,TP和COD_Mn平均去除率分别为45.0%,42.2%和50.8%.固定化微生物区域微生物数量高于水生植物根际区1～2个数量级,反硝化菌数量达到109,水生植物根区微生物数量也高于示范区自然水体2～3个数量级以上.试验结果表明,固定化微生物-水生生物强化系统具有良好的环境适应能力,治理水体富营养化效果明显,但其在前置库中的长效运行,有待于进一步验证. 

Study on Demonstration Project with the Immobilized-Microorganisms-Aquatic Plants Strengthened Purification System in Pre-dem

The immobilized-microorganisms-aquatic strengthened purification system is designed to dispose wastewater in pre-dem so as to decrease the pollution burden of Taihu Lake. Through adding high effective microorganisms of 30 mg/kg in the pre-dem during the period of domestication and then 20 mg/kg per month, the activity of microbe is intensified. During the monitoring, the mass concentrations of the influent are 0.54 - 1.59 mg/L of TN, 0.079 - 0. 172 mg/L of TP and 5.41 - 13.40 mg/L of CODMn ; HRT of pre-dem is about 9 d; the removal rates of TN, TP and CODMn are up to 45.0%, 42.2% and 50.8%, respectively. The number of microorganisms in immobilized- microorganisms area is 1- 2 degrees higher than that in hydrophyte root area. Denitration microorganisms can add up to 10^9 , and the amount in hydrophyte root area is 2 - 3 degrees higher than that in demonstration natural waters. The results indicate that immobilized-microorganisms- aquatic strengthened purification system is adapted to the environment and it is efficient, but the long-time function to pre-dem would be further tested.