选择压法培育好氧颗粒污泥的试验

以普通絮状活性污泥为接种污泥,葡萄糖为碳源,在序批式反应器中培育出好氧颗粒污泥增加COD负荷的同时,减少沉降时间以造成选择压,强化好氧颗粒污泥的形成根据污泥的形态变化,颗粒污泥的形成可分为3个阶段.反应器启动67d出现颗粒污泥COD负荷4.8kg/(m³·d)、表面气体流速0.0175m/s时,反应器中活性污泥完全颗粒化颗粒污泥粒径大多6～9mm,MLSS 7800mg/L,最小沉降速率32.7m/h.好氧颗粒污泥具有在高负荷下良好的COD去除率.对好氧颗粒污泥的基本性质及其形成的影响因素进行了初步分析.

Studies on Aerobic Granular Sludge Cultivated under Selective Pressure

As inoculum sludge from a conventional COD removal activated sludge wastewater treatment plant was used, aerobic granular sludge was cultured in sequencing batch reactor (SBR) fed with glucose as carbon substrate. The SBR was operated with decreasing sedimentation time and increasing COD loading rate resulting in the selective pressure to enhance the formation of granular sludge. According to morphology change of sludge, the generation of granule could be divided into three stage. Granules started to appear after 67 days operation. After increasing COD loading rate to 4.8 kg/(m3.d), and superficial gas velocity to 0.0175 m/s, granules were the dominant sludge forms with diameter about 6-9 mm, the minimal settling velocity of 32.7 m/h, and the MLSS of 7800 mg/L. Aerobic granular sludge demonstrates high activity and ability to withstand high COD loading rate. The properties of aerobic granular sludges and the effect of different operational conditions on the formation of these aerobic granules were also analyzed preliminarily.