不同污泥停留时间下连续废弃活性污泥和食物废物共发酵同步回收磷铁矾和挥发性脂肪酸：性能和微生物响应。
Continuous waste activated sludge and food waste co-fermentation for synchronously recovering vivianite and volatile fatty acids at different sludge retention times: Performance and microbial response.
机构信息
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, College of Environment, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, College of Environment, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China; Guohe Environmental Research Institute (Nanjing) Co Ltd, Nanjing 211599, China.
出版信息
Bioresour Technol. 2020 Oct;313:123610. doi: 10.1016/j.biortech.2020.123610. Epub 2020 Jun 1.
A practical approach of synchronously recovering vivianite and volatile fatty acids (VFAs) by food waste (FW) and waste activated sludge (WAS) co-fermentation in continuous operation was investigated. Approximately 82.88% P as high-purity vivianite (95.23%) and 7894 mg COD/L VFAs were finally recovered. The simultaneous addition of FW and FeCl contributed to the fermentation conditions by adjusting pH biologically and increasing the concentration of organic substrates, which enhanced the Fe reduction efficiency and microbial activities (e.g., hydrolases and acidogenic enzymes). Microbial analysis found the functional bacteria related to Fe reduction and VFAs generation were further enhanced and enriched. Besides, results indicated that the efficiencies of Fe and P release and VFAs recovery were highly linked to SRT, the satisfactory fermentation performance was obtained at SRT of 6 d. This research would provide a practical waste recycling technology to treat FW and WAS simultaneously for recovering vivianite and VFAs synchronously.
采用连续运行的方式，通过厨余垃圾（FW）和剩余活性污泥（WAS）共发酵同步回收鸟粪石和挥发性脂肪酸（VFAs）的实用方法得到了研究。最终回收了约 82.88%P 的高纯度鸟粪石（95.23%）和 7894mg COD/L 的 VFAs。FW 和 FeCl 的同时添加通过生物调节 pH 值和增加有机底物浓度来促进发酵条件，从而提高了 Fe 还原效率和微生物活性（例如，水解酶和产酸酶）。微生物分析发现，与 Fe 还原和 VFAs 生成相关的功能细菌得到了进一步的增强和富集。此外，结果表明，Fe 和 P 的释放以及 VFAs 回收的效率与 SRT 高度相关，在 SRT 为 6d 时可获得满意的发酵性能。该研究为同时处理 FW 和 WAS 并同步回收鸟粪石和 VFAs 提供了一种实用的废物回收技术。
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