Impacts of feeding mode on stable aerobic granular sludge cultivation for enhanced denitrification
JIN Zheng-yu1, XI Hao1,2, YUAN Quan1, WANG Kai-jun1
1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; 2. Huadian Water Engineering Co., LTD, Beijing 100160, China
Abstract：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.
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