PHB监测A^2/O工艺除磷及负荷率耦合关系的研究

Relation Analysis of Phosphorus Removal and BOD_5 Loading Using PHB Monitoring in A^2/O Process

以上海市白龙港城市污水厂初沉池污水为进水,培养驯化污泥并构建A2/O试验系统,监测PHB消耗、生成的动态变化,并分析其与除磷和BOD5负荷率的耦合关系.结果显示,曝气池中PHB的消耗与除磷呈现良好的正相关关系(p<0.05),平均消耗约140 mg左右的PHB可去除1 mg P;厌氧池中PHB的生成与释磷存在着极显著的正相关关系(p<0.01),平均释放1.17mg的磷可生成约100 mg的PHB;厌氧池中PHB的含量与系统F/M的正相关性显著(p<0.05),负荷为0.176 g/(g.d)较负荷0.413 g/(g.d)下PHB的生成量平均减少约4 mg/g(以MLSS计);PHB的合成与厌氧池中BOD5的去除量的相关性较差(p>0.05),但与温度呈极为显著的正相关关系(p<0.01),温度的升高有助于微生物合成PHB,最高温度(33.2℃)比最低温度(17.1℃)活性污泥中PHB含量约增加5 mg/g(以MLSS计),占总量的20%左右.

In a pilot-scale anaerobic-anoxic-oxic experimental system for municipal wastewater treatment, PHB consumption in an oxic tank and PHB production in an anaerobic tank had been monitored overtime, and relations among PHB consumption/production, phosphorus removal/ release and BODs loading had been analyzed. The results indicated that the consumption of PHB was positively related with phosphorus removal, and about 140 nag PHB consumption could result in 1 nag P removal. In the anaerobic tank, about 1.17 mg P release could result in 100 mg PHB production. The PHB production at the loading of 0.176 g/（g·d） was 4 mg/g MLSS less than that at 0.413 g/（g·d）. No significant relevance was observed between PHB and BOD5 removal. The PHB of microorganism synthesizes was increased with the increase of temperature. Compared with the lowest temperature （17.1℃ ）, 20% of the total PHB content was increased at the maximum temperature （33.2℃） in active sludge.