剩余污泥发酵液对黏性膨胀污泥特性的影响  

Effect of excess sludge fermentation liquid on the characteristics of viscous bulking sludge

作　　者：高春娣[1] 韩徽 张娜 李悦[1] 王传德 侯春艳 彭永臻[1] GAO Chundi;HAN Hui;ZHANG Na;LI Yue;WANG Chuande;HOU Chunyan;PENG Yongzhen(School of Environment and Energy Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学环境与能源工程学院,北京100124

出　　处：《环境工程学报》2020年第11期2980-2988,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51478012);北京市重大科技专项(Z181100005318001)。

摘　　要：为了解决剩余污泥碱性发酵液作为低碳氮比生活污水外加碳源时引发的黏性污泥膨胀问题,采用序批式反应器(SBR),以剩余污泥碱性发酵液为进水碳源,对黏性膨胀污泥的沉降性能及其影响因素之间的相关性进行了系统研究。结果表明:当进水COD值为300~350 mg·L-1时,随着运行时间的推移,污泥容积指数(SVI)逐渐升高,最终达到540 mL·g-1,此时发生污泥黏性膨胀现象;黏性膨胀污泥表面负电荷由0.62 mV累积到29.49 mV,相对疏水性(RH)从44%下降至19%,污泥容积指数(SVI)与Zeta电位、相对疏水性(RH)呈负相关(R2分别为0.837 71和0.678 54),与污泥粒径不相关;胞外聚合物总量从31 mg·g-1提高至39 mg·g-1,但LBEPS/TB-EPS的比例从0.92增加至2.92;与TB-EPS相比较,LB-EPS与污泥容积指数(SVI)、Zeta电位、相对疏水性(RH)具有显著相关性(R2分别为0.892 88、0.885 29和0.776 68)。以上结果揭示了以发酵液为碳源引发的黏性膨胀污泥特性的变化规律,可为实际工程中以发酵液为碳源的黏性污泥膨胀问题提供借鉴。In order to solve the problem of sludge bulking caused by the excess sludge alkaline fermentation liquid as the external carbon source of domestic sewage with low carbon nitrogen ratio, a sequencing batch reactor(SBR) was used to systematically study the correlation between the settling performance and the influencing factors of the viscous bulking sludge when the excess sludge alkaline fermentation liquid was taken as influent carbon source. The results show that when the influent COD was 300~350 mg·L-1, the SVI of sludge increased gradually with the running time, and finally reached 540 mL·g-1, and viscous bulking for the sludge occurred. The negative charge on the surface of viscous bulking sludge increased from 0.62 mV to 29.49 mV,the relative hydrophobicity(RH) decreased from 44% to 19%, and SVI was negatively correlated with Zeta potential or RH, and their R2 values were 0.837 71 and 0.678 54, respectively. SVI was not correlated with sludge size. The total amount of extracellular polymer increased from 31 mg·g-1 to 39 mg·g-1, but the ratio of LB-EPS to TB-EPS increased from 0.92 to 2.92. Compared with TB-EPS, LB-EPS was more strongly correlated with SVI, Zeta potential and RH with their own R2 values of 0.892 88, 0.885 29 and 0.776 68. The above results revealed the variation of viscous bulking sludge characteristics caused by taking fermentation liquid as external carbon source, which can provide reference for solving this problem in practical engineering.

关 键 词：黏性膨胀 沉降性能 表面性质 胞外聚合物 

分 类 号：X703[环境科学与工程—环境工程]