铁酸盐
化学
针铁矿
生物反应器
溶解
废水
氧烷
产酸作用
水解
吸附
核化学
环境化学
厌氧消化
废物管理
有机化学
甲烷
工程类
物理
量子力学
光谱学
作者
Ruo‐hong Li,Jinli Cui,Jia-hui Hu,Wei-jun Wang,Bing Li,Xiangdong Li,Xiaoyan Li
标识
DOI:10.1021/acs.est.9b07138
摘要
The transformation of Fe-P complexes in bioreactors can be important for phosphorus (P) recovery from sludge. In this research, X-ray absorption near-edge structure analysis was conducted to quantify the transformation of Fe and P species in the sludge of different aging periods and in the subsequent acidogenic cofermentation for P recovery. P was readily removed from wastewater by Fe-facilitated coprecipitation and adsorption and could be extracted and recovered from sludge via acidogenic cofermentation and microbial iron reduction with food waste. The fresh Fe-based sludge mainly contained fresh ferrihydrite and amorphous FePO4 with sufficient accessible surface area, which was favorable for Fe-P mobilization and dissolution via microbial reaction. Ferric iron dosed into wastewater underwent rapid hydrolysis, clustering, aggregation, and slow crystallization to form hydrous iron oxides (HFO) with various complicated structures. With the aging of sludge in bioreactors, the HFO densified into phases with much reduced surface area and reactivity (e.g., goethite), which greatly increased the difficulty of P release and recovery. Thus, aging of P-containing sludge should be minimized in wastewater treatment systems for the purpose of P recovery.
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