通过 pH 值调节，柠檬酸对废活性污泥胞外聚合物的破坏和细胞裂解的影响。
Effect of citric acid on extracellular polymeric substances disruption and cell lysis in the waste activated sludge by pH regulation.
机构信息
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
出版信息
Bioresour Technol. 2020 Apr;302:122859. doi: 10.1016/j.biortech.2020.122859. Epub 2020 Jan 22.
This paper investigated the effects of citric acid (CA) on extracellular polymer destruction and cell lysis in sludge at different initial pH by measuring capillary suction time (CST), extracellular polymeric substances (EPS) and intracellular bound water. The results indicated that under CA concentration at 0.05 g/g suspended solids (SS) and initial pH 4, the CST value decreased from 175.5 s to 112.3 s, slime extracellular polymeric substances (S-EPS) and loosely bound EPS (LB-EPS) content respectively to increase from 4.92 to 41.43, 2.27 to 5.49 mg/g volatile suspended solids (Vss), while tightly bound EPS (TB-EPS) content to decrease from 12.35 to 5.01 mg/g (Vss), which suggested CA could disrupt outer EPS effectively. Intracellular bound water content decreased from 1.23 g/g to 0.41 g/g dry solid (DS). As a result, CA could release intracellular bound water effectively, thereby improving sludge dewatering degree.
本研究通过测定毛细吸留时间（CST）、胞外聚合物（EPS）和细胞内结合水，考察了柠檬酸（CA）在不同初始 pH 值下对污泥中胞外聚合物破坏和细胞裂解的影响。结果表明，在 CA 浓度为 0.05 g/g 悬浮固体（SS）和初始 pH 值为 4 的条件下，CST 值从 175.5 s 降低到 112.3 s，污泥胞外聚合物（S-EPS）和松散结合 EPS（LB-EPS）含量分别从 4.92 mg/g 挥发性悬浮固体（VSS）增加到 41.43 mg/g 和从 2.27 mg/g 增加到 5.49 mg/g VSS，而紧密结合 EPS（TB-EPS）含量从 12.35 mg/g 降低到 5.01 mg/g（VSS），表明 CA 可以有效地破坏胞外 EPS。细胞内结合水含量从 1.23 g/g 降低到 0.41 g/g 干固体（DS）。因此，CA 可以有效地释放细胞内结合水，从而提高污泥的脱水程度。
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