基于反硝化聚磷菌的颗粒污泥的培养

采用SBR反应器,利用絮状污泥为接种污泥,培养反硝化聚磷菌颗粒污泥,在提高污泥氮磷去除率的同时,实现污泥的颗粒化.结果表明,经过三个阶段45d的培养,体系达到稳定状态,利用其处理模拟生活废水时,磷的去除率在90%左右,氨氮、COD的去除率在95%左右,单位硝态氮反硝化吸磷量达到0.876mg/mg,反硝化聚磷菌占聚磷菌的比例为74.36%.污泥的平均粒径在1.0~2.0mm之间,平均沉降速度为44~72m/h.由此可以看出,通过调节溶解氧,使污泥处于厌氧、缺氧及好氧状态,可以实现基于反硝化聚磷菌的污泥颗粒化.

Cultivate of granular sludge based on denitrifying phosphate accumulating bacteria

Aerobic granules based on denitrifying phosphate accumulating bacteria were developed in sequencing batch reactors (SBRs) with flocs sludge as seed to improve nitrogen and phosphorus removal rate. The results showed that the denitrifying phosphate accumulating bacteria was successfully cultivated after 45days. During the synthetic domestic wastewater treatment, the phosphate removal rate of this system was around 90%, and the both removal rates of COD and ammonia nitrogen were around 95%. Meanwhile, the unit amount of nitrate denitrifying phosphate uptake reached 0.876mg/mg, and the ratio of denitrifying phosphate accumulating bacteria was 74.36% in phosphorus-accumulating bacterias (PAOs). The highest volume percentage of the granules was in the range of 1.0~2.0mm, and the settling velocity of mature granules in reactor was 44~72m/h. It can be concluded that aerobic granules based on denitrifying phosphate accumulating bacteria can be cultivated by adjusting the dissolved oxygen of SBR.