胞外聚合物
钙
废水
化学
钙化
吸附
细胞外
颗粒(地质)
无氧运动
化学工程
生物物理学
环境工程
生物化学
材料科学
细菌
生物膜
环境科学
有机化学
生理学
生物
医学
工程类
病理
复合材料
遗传学
作者
Ling Peng,Jian Zhang,Yong Chen,Can Xie,Su Liu,Shuangfei Wang
标识
DOI:10.1016/j.biortech.2024.131032
摘要
Controlling CaCO3 precipitation within anaerobic granular sludge (AnGS) is crucial for the anaerobic treatment of paper recycling wastewater. A viable strategy was proposed to control calcification by adjusting a mild acidic condition in an anaerobic reactor without hindering organic degradation. The results indicated that lowering the bulk pH (6.5 to 6.8) reduced calcium precipitation by 60.1 % in calcium-rich influent (Ca2+ 1200 mg/L) and eradicated CaCO3 deposition on AnGS. Extracellular polymeric substances (EPS) have proven to be crucial participants in Ca2+ migration. The acidic solution weakens the interactions between EPS and Ca2+ and then diminishes the EPS adsorption capacity and affinity for Ca2+. The mild acidic environment goes beyond reducing CaCO3 formation in wastewater. EPS protonation reduced the probability of Ca2+ adhering to the AnGS surface, which halted calcium transportation from bulk liquid to granule. This work offers a feasible strategy to prevent AnGS calcification in high-calcium wastewater.
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