不同碳源种类对好氧颗粒污泥合成PHA的影响

影响好氧颗粒污泥稳定性的因素众多,其中碳源种类的不同会造成好氧颗粒污泥合成聚羟基烷酸酯(PHA)的不同,进而影响其稳定性能.采用混合碳源驯化培养的好氧颗粒污泥进行试验.考察了厌氧条件下,乙酸钠等八种碳源对好氧颗粒污泥合成PHA的影响.结果表明,颗粒污泥对乙酸钠和蔗糖具有较好的转化能力,合成PHA的量分别为102.19mgCOD/g·VSS和70.58mgCOD/g·VSS,显著高于其他碳源的PHA合成量(5~26mg/g×VSS).故以蔗糖和乙酸钠作碳源均有利于颗粒污泥稳定性能的维持,而当以甲醇作碳源时好氧颗粒污泥的贮存能力最差.

Effect of various types carbon source on the synthesis of PHA of aerobic granular sludge

The stable performance of aerobic granular sludge would be affected by various factors. The type of carbon source was reported to have impact on the synthesis of poly hydroxy acid lipid (PHA), consequently affect the stability of the aerobic granular sludge. In this study, the aerobic granular sludge was cultivated with the mixed carbon source, and the effect of different carbon source on the PHA synthesized by aerobic granular sludge was investigated. The tests were conducted with 8kinds of carbon source including sodium acetate, methanol, glucose, maltose, starch, sugar, glutamic sodium and peptone. The results showed that the aerobic granular sludge had better performance for transforming the sodium acetate and sugar to PHA, with the storage capacity reached up to 102.19mgCOD/g·VSS and 70.58mg COD/g·VSS, respectively. This was significantly higher than the value using the other carbon source, which was in the range of 5~20mg/g·VSS. Therefore, it was beneficifal to maintain the stable performance of granular sludge by using sugar and sodium acetate as carbon source. However, the lowest storage of PHA was found when methanol was used.