中文摘要：

以普通活性污泥为种泥，以乙酸钠为碳源，按照COD：N：P=100：5：1的营养比例配制底物，在SBR反应器的厌氧／好氧交替运行条件下，考察了进水COD浓度对活性污泥合成聚羟基烷酸酯（PHA）的影响。结果表明，当进水COD≤800mg／L时，活性污泥合成PHA的能力与进水COD浓度呈正相关，最大PHA含量可达21％左右；当进水COD继续增至1000mg／L时，PHA产率无明显提高。在SBR中，PHA的合成主要发生在厌氧阶段，而好氧阶段会消耗PHA。

英文摘要：

Using conventional activated sludge as seeding sludge, sodium acetate as carbon source and nutrient ratio of COD ： N ： P = 100 ： 5 ： 1, the effect of the influent COD concentration on synthesis of polyhydroxyalkanoates （PHA） by activated sludge was investigated in SBR operated in alternative anaerobic/aerobic mode. The results show that when the influent COD is equal to or less than 800 mg/L, the synthesis of PHA is proportional to COD concentration, and the maximum PHA content can reach 21%. When COD is 1 000 mg/L, the yield of PHA is not significantly increased. The synthesis of PHA occurs mainly in anaerobic stage while PHA is consumed in aerobic stage.