农村生活污水进水沉降性颗粒有机物碳源利用潜势研究

Study on utilization potential of carbon source of sinkable particulate organic matter in rural domestic sewage

由于农村生活污水具有水质水量波动大的特点,导致农村生活污水处理工程在实际运行中存在进水碳源不足的问题。以农村生活污水中沉降性颗粒有机物为目标对象,研究其在内碳源开发过程中水质和微生物群落变化特征。试验结果表明在SCOD随反应时间的增加浓度是先增加后降低,并且第4天浓度达到最高值859 mg/L,此时C/N较江苏省平均值提高了35.7%,说明颗粒有机物水解发酵产物可以作为一种有效的碳源用于农村生活污水的碳源补给。由微生物群落结构分析发现主要降解蛋白质、碳水化合物和脂类的功能菌属是Lactivibrio,主要产酸的菌属有Romboutsia、Christensenellaceae_R-7_group、和Corynebacterium。经过古菌分析发现Methanosaeta作为最主要的古菌菌属,其大量的繁殖是导致系统内碳源流失的主要原因。

Due to the large fluctuations in the quality and quantity of rural domestic sewage, there is a problem of insufficient carbon sources in the actual operation of rural domestic sewage treatment projects. This study took sedimentary particulate organic matter in rural domestic sewage as the target object, and studied the characteristics of water quality and microbial community changes in the process of internal carbon source development. The experimental results showed that the concentration of SCOD increased first and then decreased with the increase of reaction time, and the concentration reached the highest value of 859 mg/L on the 4 th day. At this time, the C/N increased by 35.7% compared with the average value of Jiangsu province, indicating that the hydrolysis and fermentation products of particulate organic matter It can be used as an effective carbon source for the carbon source replenishment of rural domestic sewage. From the analysis of microbial community structure, it was found that Lactivibrio mainly degrades proteins, carbohydrates and lipids, and the main acid-producing genera are Romboutsia, Christensenellaceae_R-7_group, and Corynebacterium. The archaeal analysis found that Methanosaeta was the most important archaeal genus, and its mass reproduction was the main reason for the loss of carbon sources in the system.