SBR中好氧颗粒污泥的培养

Cultivation of the Aerobic Granular Sludge in Sequencing Batch Reactor

采用竖式SBR作为反应器,利用城市污水处理厂剩余污泥作为接种污泥,通过不间断运行培养出好氧颗粒污泥。实验结果表明,采用非限量曝气模式好氧颗粒污泥降解模拟污水的效果较好,其COD去除率可达98%以上。曝气量对好氧颗粒污泥的形成和稳定具有重要影响,当气速为26.5m/h时,好氧颗粒污泥的性状和处理有机废水效果最佳。同时好氧颗粒污泥对pH值的变化不明显,当pH为5～8范围内,其COD去除率都可达到85%以上。但是未经驯化的好氧颗粒污泥对对硝基苯酚和对氯苯酚两种芳香类有机物较敏感,而对硝基苯酚对其毒性更大。当对硝基苯酚和对氯苯酚浓度为10mg/L时,其COD去除率仅为42.5%和52%。

Aerobic granular sludge was cultivated through continuous operation in SBR system seeded with excess sludge of sewage plant. The results showed that for degradation of the simulated sewage in non-limited aeration, the aerobic granular sludge were efficient to reach COD removal rate up to 98%. The aeration intensity affected the formation and stabilization of the aerobic granular sludge very much. At the aeration speed of 60m/h, the properties and wastewater treating effeet of the granular sludge reached the optimum. The aerobic granular sludge depended on pH insignificantly. The COD removal rate reached more than 85% when the pH value ranged in 5- 8. The aerobic granular sludge without acclimation was sensitive to p-nltrophenol and p-ehlomphenol, especially the former. When the concentrations of p-nitrophenol and p-ehlomphenol were 10mg/L, the COD removal rates only reached 42.5 and 52% respectively.