In situ and short-time anaerobic digestion coupled with alkalization and mechanical stirring to enhance sludge disintegration for phosphate recovery
In situ and short-time anaerobic digestion coupled with alkalization and mechanical stirring to enhance sludge disintegration for phosphate recovery
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原位短时间厌氧消化结合碱化和机械搅拌，增强污泥分解以回收磷酸盐
DOI：
10.1016/j.cej.2018.06.156
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发表时间：
2018-11
影响因子：
15.1
通讯作者：
Yashika G. De Costa
中科院分区：
文献类型：
--
作者：
Zhou Lijie;Zhuang Wei-Qin;Yashika G. De Costa
研究了原位短时间厌氧消化结合碱化和机械搅拌促进污泥（特别是高无机污泥）分解回收磷酸盐的方法。进行了不同条件下的厌氧消化批量实验。观察到，高初始pH值（例如9,10,12和13）与机械搅拌相结合，导致污泥有效分解。结果表明，机械搅拌主要起到均匀混合的作用，促进物料交换和细菌接触，不具有破坏细胞壁的涡旋剪切力作用。随着碱化程度的增加，细菌效应对污泥磷酸盐回收的贡献越来越小，说明在操作过程中，化学效应的作用更为显著。同时，不溶性非磷灰石无机磷经碱化和机械搅拌，几乎全部溶解回上清液中。因此，与其他污泥分解方法相比，就地短时间厌氧消化结合碱化和机械搅拌是经济实用的，污泥分解只需要7 天，特别是在最佳碱度（pH 9和10）的情况下。
In situ and short-time anaerobic digestion coupled with alkalization and mechanical stirring was studied to enhance sludge (especially high-inorganic sludge) disintegration for phosphate recovery. Anaerobic digestion batch experiments with varying conditions were carried out. It was observed that high initial pH values (e.g. 9, 10, 12 and 13) in conjunction with mechanical stirring resulted in effective sludge disintegration. Results showed that mechanical stirring mainly worked as the role of uniform mixing for better material exchange and bacteria contact, but without the function of vortex shear force for cell wall breaking. Bacterial effects contributed less and less to phosphate recovery from sludge as alkalization increased, indicating that chemical effects have a more significant role during operation. Meanwhile, almost all insoluble non-apatite inorganic phosphorus was dissolved back into the supernatant with alkalization and mechanical stirring. Therefore, compared with other sludge disintegration methods, in situ and short-time anaerobic digestion coupled with alkalization and mechanical stirring is economical and practical, requiring only 7 days for sludge disintegration, especially with optimum alkalinity (pH 9 & 10).
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