碳源对解体后好氧颗粒活性恢复的影响

在序批式反应器(SBR)中,分别以葡萄糖,葡萄糖-乙酸钠混合碳源,乙酸钠为碳源,对解体后的好氧颗粒污泥进行为期30天的活性恢复.研究结果表明:活性恢复过程中,好氧颗粒对COD和NH3-N的去除几乎不受碳源的影响,10d后好氧颗粒污泥对COD和NH3-N的去除活性完全恢复.碳源会较大地影响好氧颗粒污泥的物理特征及对TN,TP的去除,采用乙酸钠进行活性恢复后的好氧颗粒脱氮除磷效果最好,20d后对TN和TP的去除率可从解体时的45%和42%恢复到74%和81%;而采用混合碳源进行活性恢复后的好氧颗粒的COD比降解速率最大,达到10.74kgCOD/(kgMLSS×d),恢复至颗粒解体前的112%;以乙酸钠为碳源可使好氧颗粒硝化,反硝化能力得到较好的恢复,NH3-N和TN的比降解速率分别达到0.335kgNH3-N/(kgMLSS×d)和0.272kgTN/(kgMLSS×d),分别恢复至颗粒解体前的97%和101%.

The effect of carbon source on disintegrated aerobic granular during activity recovery

This activity recovery of aerobic granular was investigated in SBR with three different carbon sources including glucose, sodium acetate and a mixture of glucose-sodium acetate for 30 days. The results indicated that carbon sources greatly influenced the physical characteristics of aerobic granular sludge and TN,TP removal during the recovery period. Conversely, the removal efficiencies of COD and NH3-N had been little influenced by carbon sources in the whole activity recovery period. And aerobic granular sludge activity for COD and NH3-N removal was recoveried fully after 10 days.. After the aerobic granular sludge reached the steady state, the aerobic granular with sodium acetate showed the best effect on nitrogen and phosphorus removal, the removal efficiency of TN and TP increased from 45% and 42% to 74% and 81% respectively after 20 days. While COD specific degradation rate can reach to 10.74kgCOD/(kgMLSS?d) with glucose-sodium acetate, which was 112% than that before aerobic granular was disintegrated. The nitrification and denitrification ability of aerobic granular sludge got best recovery with sodium acetate, the specific degradation rate of NH3-N and TN reached to 0.335kgNH3-N/(kgMLSS?d) and 0.272kgTN/(kgMLSS?d) respectively and the reactivation resumed to 97% and 101% respectively.