SBR中混合接种不同储存方式的好氧颗粒污泥的恢复

考察了混合接种不同储存时间及储存方式的好氧颗粒污泥(AGS)的恢复效果。储存后的AGS表现出不同的形态特征:常温湿式储存两年的AGS形态松散, 出现了明显的解体现象;常温湿式储存一年的AGS未出现明显的解体现象, 但颜色明显变黑;琼脂包埋干式储存五个月的硝化颗粒污泥颜色、形态及沉降性能变化不大。重新曝气后, 污泥的MLSS(4.85~10.51 g/L)与MLVSS/MLSS(0.6~0.75)、EPS(15.05~38.36 mg/g MLSS)、平均粒径(0.61~1.12 mm)及颗粒化率(80.92%~97.60%)迅速增大, COD及氨氮去除率也分别在19天与15天上升至90%以上。恢复过程中, 颗粒污泥经历了先破裂后重新颗粒化的过程。根据恢复过程中颗粒污泥的理化特性可知, 混合污泥在21天内成功实现了稳定性及效果恢复。研究结果表明混合部分储存后的硝化颗粒污泥有效提高了硝化细菌的富集速度, 为应用时AGS中硝化细菌的快速富集提供了一种新思路。 

Recovery of aerobic granular sludge in a sequencing batch reactor by inoculating stored granules with different storage methods

The recovery of aerobic granular sludge(AGS)with different storage time and storage methods was investigated.After storage,the AGS showed different morphological characteristics:AGS stored at wet room temperature for two years was loose and disintegrated;AGS stored at wet room temperature for one year showed no obvious disintegration,but the anaerobic core was clearly observed;the color,morphology and sedimentation performance of the nitrifying granular sludge stored in agar for five months did not change a lot.After re-aeration,MLSS(4.85~10.51 g/L),MLVSS/MLSS(0.6~0.75),EPS(15.05~38.36 mg/g MLSS),average particle size(0.61~1.12 mm)and granulation rate(80.92%~97.60%)increased rapidly,and the removal rates of COD and ammonia nitrogen also increased to more than 90%in 19 days and 15 days,respectively.During the recovery process,granular sludge experienced a process of firstly breakage and then re-granulation.According to physicochemical characteristics of AGS during the recovery process,the mixed granules were successfully recovered within 21 days.Inoculating part of stored nitrifying granular sludge effectively increased the enrichment rate of nitrifying bacteria,which provided a new idea for the rapid enrichment of nitrifying bacteria in AGS in application.