进水模式对强化脱氮好氧颗粒污泥培养的影响

针对不同进水模式对好氧颗粒污泥培养及强化脱氮效果的影响尚无统一定论的问题，系统比较研究了快速进水直接曝气、快速进水厌氧搅拌和厌氧推流慢速进水3种模式对好氧颗粒污泥形成特性及脱氮效果的影响.研究发现，快速进水直接曝气模式所形成颗粒污泥表面易生长丝状菌，颗粒粒径可达2.0mm以上，但易解体；快速进水厌氧搅拌模式可形成粒径多为1.5~2.0mm的好氧颗粒污泥，TN去除率达到80%，优于前种模式，但未能避免颗粒解体；厌氧推流慢速进水可获得粒径多为1.0~1.5mm的颗粒污泥，常规负荷下出水COD浓度约10~15mg/L，TN浓度小于1mg/L，TN去除率达90%，满足地表Ⅲ类水标准.系统比较证实，厌氧推流慢速进水方式是实现强化脱氮好氧颗粒污泥培养的最佳模式.

Impacts of feeding mode on stable aerobic granular sludge cultivation for enhanced denitrification

The role of feeding mode in cultivating stable aerobic granular sludge for enhanced denitrification was studied.Three typical modes,including direct aeration after fast feeding,anaerobic stirring after fast feeding and anaerobic plug-flow slow feeding,were compared in this study in terms of granular stability and denitrification performance.Large granules with a diameter over 2.0mm formed in the first mode,but underwent severe filamentation and degranulation afterwards.Granules with an average diameter of 1.5~2.0mm in the second mode achieved a TN removal of 80%,but failed to prevent degranulation.Anaerobic plug-flow slow feeding mode formed stable granules with an average diameter of 1.0~1.5mm and managed effluent quality with a COD concentration of 10~15mg/L and a TN concentration less than 1mg/L (90% removal),which matched the requirement of surface water quality standards class Ⅲ in China.As such,anaerobic plug-flow slow feeding was demonstrated the most promising feeding mode for stable aerobic granular sludge cultivation aiming at enhanced denitrification.