在厌氧发酵过程中，从废活性污泥中产生挥发性脂肪酸：超细砂的影响。
Volatile fatty acids production from waste activated sludge during anaerobic fermentation: The effect of superfine sand.
机构信息
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Changzhou University Huaide College, 136 Xingang Road, Jingjiang, Jiangsu Province 214500, China.
State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
出版信息
Bioresour Technol. 2021 Jan;319:124249. doi: 10.1016/j.biortech.2020.124249. Epub 2020 Oct 13.
Superfine sand in waste activated sludge (WAS) increased the uncertainty of anaerobic fermentation. Experiments showed that VFAs production from WAS was positively affected by superfine sand, with an increase from 2513 mg COD/L in the control (without superfine sand) to 3002 mg COD/L with superfine sand. A mechanism study demonstrated that the main factor responsible for the improved VFAs accumulation in response to superfine sand was acetic acid, which increased by nearly 30%. Further investigation exhibited that the process of solubilization and acidification were facilitated by superfine sand and the abundance of anaerobic functional microorganisms was greatly increased. Moreover, the activities of acetate kinase (AK) as well as the quantity of AK encoding gene were greatly promoted by superfine sand. The heat release during WAS anaerobic fermentation with superfine sand was higher than that without superfine sand (25.8 × 10 versus 24.7 × 10 W·min at about 70 min).
超细砂会增加剩余活性污泥（WAS）厌氧发酵的不确定性。实验表明，超细砂对 VFAs 的产生有积极影响，VFAs 的产量从对照（无超细砂）的 2513mg COD/L 增加到添加超细砂后的 3002mg COD/L。机制研究表明，响应超细砂而导致 VFAs 积累增加的主要因素是乙酸，其含量增加了近 30%。进一步的研究表明，超细砂促进了溶解和酸化过程，极大地增加了厌氧功能微生物的丰度。此外，超细砂大大促进了乙酸激酶（AK）的活性和 AK 编码基因的数量。添加超细砂的 WAS 厌氧发酵过程中的放热量高于无超细砂的情况（大约 70 分钟时，25.8×10 与 24.7×10 W·min）。
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