Abstract:

Polyhydroxyalkanoates（PHAs）are environmentalfriendly biothermoplastics with the potential of wide applicationPHAs synthesis by activated sludge is costsaving and beneficial for waste recycleThe monomer composition and content of PHAs determine the physicochemical characteristics of the polymerBased on the technology of optimizing PHAs production，the process manipulation and biochemical metabolism for regulating the hydroxyvaleryl content in poly（3hydroxybutyrateco3hydroxyvalerat（PHBV）by activated sludge were summarizedLiterature review indicated that under aerobic condition the nature of carbon substrate was crucial to the final composition of PHBVGenerally，decrease of dissolved oxygen concentration（DO）led to hydroxyvaleryl [JP2]content enhancement，and variation of sludge source，pH and carbon to nitrogen and/or phosphorus ratio all tended to alter hydroxyvaleryl content.The effects of the above parameters on hydroxyvaleryl content were interrelated with each otherFurther research to regulate the composition of PHAs from activated sludge was forecasted.

Key words:

活性污泥, 聚羟基烷酸酯, 工艺条件控制, 代谢途径, 聚合物组分

摘要：

聚羟基烷酸酯（PHAs）是一类生物合成的环境友好高分子塑料，具有广泛应用前景。活性污泥合成PHAs可降低PHAs生产成本，实现废物资源化。PHAs的物化性质取决于其单体组分的结构和含量。基于优化PHAs产量的工艺研究，总结了调控活性污泥合成的聚羟基丁酸羟基戊酸（PHBV）中羟基戊酰含量的工艺措施和生化原理。已有研究表明，好氧时，碳源类型决定PHBV中的单体组分;一般地，溶解氧浓度（DO）降低，PHBV中HV含量会增加;污泥来源、pH值以及碳源与氮磷浓度比的变化都会影响HV含量;各参数对PHAs组分的影响存在关联性。展望了调控活性污泥合成PHAs中单体组分的进一步研究方向。

关键词:

活性污泥, 聚羟基烷酸酯, 工艺条件控制, 代谢途径, 聚合物组分