化学
磷
胞外聚合物
发酵
强化生物除磷
磷灰石
无氧运动
活性污泥
磷酸盐
遗传算法
环境化学
核化学
废水
食品科学
生物化学
生物膜
生物
环境工程
矿物学
细菌
生态学
有机化学
环境科学
生理学
遗传学
作者
Jinghua Lv,Bingru Liu,Li Gong,Xingyue Chen,Linlin Tian,Yunbei Li,Jishao Jiang
标识
DOI:10.1080/09593330.2021.1996466
摘要
The effects of the addition of EDTA-2Na on sludge disintegration and phosphorus (P) migration during anaerobic fermentation (AF) of waste activated sludge (WAS) are investigated. The efficiency of sludge disintegration was positively correlated with the dose of EDTA-2Na from 0.5-2.0 g/g SS, and an enormous quantity of P was liberated into the aqueous phase, accompanied by sludge disintegration. The proper dose of EDTA-2Na for P release from WAS was 1.5 g/g SS, with an orthophosphate concentration of 394.72 mg/L. P release was more consistent with the pseudo second-order kinetic model. The migration of P species during AF with EDTA-2Na addition was also studied. Orthophosphate was the main species in both of the liquid phase and the loosely bound extracellular polymeric substances (EPS), but organic P (OP) was much more abundant in tightly bound EPS. Inorganic P (IP) was the dominant P speciation in the solid and was mainly distributed in the fraction of non-apatite IP, which accounted for more than 62.8% of IP in the presence of EDTA-2Na. In addition, both IP and OP in the solid contributed to the accumulation of P and the former was outperformed. Furthermore, the increased total dissolved P mainly came from cells. However, the fermented sludge tended to be smaller and to have low compressibility, which is detrimental to its further treatment.
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