采用热重方法分析不同含盐条件下的好氧颗粒特性

Evaluation of aerobic granules formed under different sodium chloride concentrations using thermogravimetric analysis

采用热重分析方法对不同含盐条件下形成的好氧颗粒污泥进行分析.结果表明,含盐量为1%(质量分数)(反应器R1)、2.5%(R2)、5%(R3)条件下所形成的颗粒污泥,在105℃之前损失的结合水的质量分数分别为4.48%、3.72%、3.25%.这表明,含盐量的提高降低了颗粒污泥中强物理结合的水分含量.3个反应器的VSS与灰分质量之比分别为2.71、1.15、1.05,表明随着含盐量的增加,微生物的活性下降.3个反应器吸收峰峰值温度R1(R2(R3,表明R1中的物质最为复杂,同时DTA曲线的复杂程度显示R1的颗粒污泥物质最丰富;由此推断,随着含盐量的增加,微生物代谢产物复杂程度减小.因此,热重分析法能够很好的描述好氧颗粒污泥的结合水、生物活性、微生物代谢产物、密实度等特性,是一种很有潜力的分析方法.

Thermogravimetric analysis was employed for the evaluation of aerobic granules that developed under sodium chloride concentrations of 1% （reactor R1 ）, 2.5% （reactor R2） and 5% （reactor R3）. High sodium chloride concentrations resulted in a low amount of strongly physically bound water in terms of the weight loss before 105 C. The ratios of Volatile Suspended Solids （VSS） to ash solids were 2.71 , 1.15 and 1.05 in R1 , R2 and R3, respectively, indicating that the activity of biomass decreased with the increase of salinity. The endothermie peaks shifted to low temperatures with the increase of salinity, and the DTA （differential, thermaanalysis） curve for the R1 granules was the most complex, with several peaks suggesting a rich array of metabolites are formed in the low salinity conditions. This study shows that thermogravimetric analysis could effectively describe the bound water, bioactivity, metabolites and compactness of granules.