碳源对好氧颗粒污泥物理性状及除磷性能的影响

Different Carbon Condition Influence the Physical Characteristics and Phosphorous Removal Ability of Aerobic Granular Sludge

采用气升式内循环序批反应器(IC SBAR)分别以葡萄糖、乙酸钠、乙醇为碳源培养出好氧颗粒污泥,考察了3种颗粒污泥的物理性状、除磷能力及除磷机理。试验结果表明3种颗粒污泥在结构和处理效果上都能长时间保持稳定,其中乙酸钠和葡萄糖培养出的颗粒污泥具有相对密实的内部结构和较好的沉降性。在进水COD 600 mg/L,总磷15 mg/L时,葡萄糖、乙酸钠、乙醇培养出的好氧颗粒污泥对总磷的去除率分别为82%、88%、52%,其中对总磷去除效果较好的2种好氧颗粒污泥(乙酸钠、葡萄糖)在反应初期均有比较明显的释磷现象发生。考察了乙酸钠为碳源的反应器在加大COD负荷下除磷能力的变化,其中在COD浓度为800 mg/L时TP的去除率达到92%,而进一步加大COD负荷会使好氧颗粒的除磷能力迅速下降。

This paper investigated physical characteristics, phosphorous removal ability and phosphorous removal mechanism of aerobic granular sludge in three internal-circulate sequencing batch airlift reactors （IC-SBARs）, the three reacters fed with different substrate including glucose, acetate and ethanol, respectively. The results showed that the morphology and treatment performance of the three reactors could be kept stable in the long-term experiments. The granular sludge fed with acetate and glucose was denser and had better settleability. With the influent of 600 mg/L COD and 15 mg/L TP, the phosphorous removal efficiencies of the three reactors with glucose, acetate and ethanol were 82%, 88% and 52%, respectively. The granular sludge fed with acetate and glucose had excellent phosphorous releasing. The increase of COD concentration could impact phosphorous removal significantly. As COD increased to 800 mg/L, the phosphorous removal efficiency in the reactor fed with acetate increased to 92%, however, too high COD concentration would result in a significant decrease of phosphorous removal efficiency.