微氧颗粒污泥强化剩余污泥与餐厨垃圾协同消化

Synergistic Digestion Characteristic of Excess Sludge and Food Waste Enhanced by Micro-aerobic Granular Sludge

为确定剩余污泥高效消化的有效方式,采用不接种颗粒污泥(NOGS)和接种颗粒污泥(GS)的EGSB反应器处理含固率为10%的剩余污泥。在27 ~33覽的中温条件下,当回流量为10L/h、液体上升流速为1.5 m/h、消化时间为21d时,对比NOGS-EGSB厌氧消化剩余污泥、GSEGSB厌氧消化剩余污泥、GS-EGSB厌氧消化热水解(90 °C ,45 min)的剩余污泥(+后期微氧)和GS-EGSB微氧消化剩余污泥(+后期餐厨垃圾协同消化)的运行效果。结果表明,EGSB反应器中回流形成的适度搅拌能强化对剩余污泥的处理。高活性颗粒污泥内丰富的微生物菌群的集群协同作用保证了对剩余污泥的高效处理效果。热水解能够强化剩余污泥中微生物的溶胞效果,提高微生物细胞中有机物的溶出率,但微氧曝气对溶出后有机物的降解更有效。微氧EGSB反应器能够高效处理剩余污泥,少量餐厨垃圾的加入能够促进剩余污泥的消化。高活性颗粒污泥、微氧曝气、餐厨垃圾协同消化是EGSB反应器高效处理剩余污泥的关键因子。

In order to determine effective methods for efficient digestion of excess sludge,excess sludge with 10%solid content was treated by EGSB with or without inoculated granular sludge(GS and NOGS)respectively.Under the condition of flow rate of 10 L/h,liquid rising velocity of 1.5 m/h,digestion for 21 days at 27-33°C,the effects of four operational strategies were compared:anaerobic digestion of excess sludge by NOGS-EGSB,anaerobic digestion of excess sludge by GS-EGSB,anaerobic digestion of excess sludge themial hydrolyzed at 90°C for 45 min(4-micro-aeration at the later stage),and micro-aerobic digestion of excess sludge by GS-EGSB(+synergistic digestion with food waste at the later stage)?The results showed that the digestion of excess sludge could be enhanced by the appropriate agitation formed by the effluent recycle of the EGSB.The efficient treatment of excess sludge was achieved by the synergistic effect of abundant microbial community inhabited in the high activity granular sludge.Thermal hydrolysis could enhance the cell wall breaking of microorganisms in excess sludge and furthermore improve the dissolution rate of organic matter in microbial cells.However,the micro-aeration was a more effective degradation way for the dissolved organic compounds.Excess sludge could be efficiently treated by the micro-aerobic EGSB,and the addition of food waste could promote the digestion of excess sludge.High activity granular sludge,micro-aerobic aeration and synergistic digestion of food waste were the key factors for efficient treatment of excess sludge in EGSB.