温度对活性污泥沉降性能与微生物种群结构的影响

为探究运行温度与活性污泥沉降性能之间的关系,采用5个带有自控设备的序批式反应器考察了不同的运行温度(15,20,25,30和35℃)对活性污泥沉降性能及微生物种群结构的影响.结果表明,采用短时进水,由于运行温度对污泥沉降性能的影响远远弱于底物浓度的影响,且系统中的优势丝状菌以Type 0041和Type 0092为主,所以5个系统均未发生污泥膨胀现象;采用长时进水,5个系统均发生了丝状膨胀现象,温度与低底物浓度的相互作用导致污泥的SVI值随运行温度(15~30℃)的增加而升高,而运行温度为35℃时污泥的SVI值要低于30℃的情况.同时不同的运行温度下污泥胞内胞外贮存特性及优势丝状菌的种类差异较大.

Effect of temperature on activated sludge settleability and microbial community structure

In order to investigate the relationship between operating temperature and sludge settleability, five sequencing batch reactors with automatic control equipment were adopted to explore the effect of different operating temperature (15, 20, 25, 30 and 35℃) on sludge settleability and microbial community structure. The results showed that: when inflowing time was five minutes, sludge bulking did not occurred in all systems. This was due to that effect of operating temperature on sludge settleability was much weaker than substrate concentration, and the dominating filamentous bacterium were Type 0041 and Type 0092; when five hours were adopted, five systems were occurred filamentous bulking phenomenon and SVI value increased as operating temperature (15~30℃) rising due to the interaction between temperature and low substrate concentration. While operating temperature was 35℃, SVI value was lower than that in 30℃. Moreover, the features of the intracellular storage and extracellular storage as well as the types of dominating filamentous bacteria had a great difference when operating temperature was different.