Enhanced short chain fatty acids production from anaerobic fermentation of primary sludge using free ammonia pretreatment
Enhanced short chain fatty acids production from anaerobic fermentation of primary sludge using free ammonia pretreatment
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DOI：
10.1016/j.jclepro.2023.135862
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发表时间：
2023-01
影响因子：
11.1
通讯作者：
Jiamin Zhang;Dong-bo Wang;Xiaoming Li;Xuran Liu;Qi Yang;Qiu-xiang Xu;Guo-jing Yang;Abing Duan;Yingchun Fang
中科院分区：
文献类型：
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作者：
Jiamin Zhang;Dong-bo Wang;Xiaoming Li;Xuran Liu;Qi Yang;Qiu-xiang Xu;Guo-jing Yang;Abing Duan;Yingchun Fang
这项研究首次报道了一种新的游离氨（FA）预处理技术，用于从初级污泥（PS）中回收短链脂肪酸（SCFA）。结果显示，FA 预处理 (240 mg N/L) 大大提高了 PS 中 SCFA 的产量，达到 355.8 mg 化学需氧量 (COD)/g VSS，约为对照（即 80 mg COD/g VSS）的 4.5 倍。机理研究表明，FA预处理大大加速了PS的溶解并破坏了EPS的完整性，发酵液中易生物降解的底物显着增加，为微生物提供了更多的有机物转化为SCFA。进一步分析表明，FA极大地抑制了发酵过程中甲烷的产生，导致短链脂肪酸SCFA的进一步积累。鉴于发酵过程中释放的NH4+-N可以原位转化为FA，这可以促进废水处理厂的运行从线性模式转变为循环模式。
This study is the first to report a new free ammonia (FA) pretreatment technique to recover short-chain fatty acids (SCFAs) from primary sludge (PS). The results showed FA pretreatment (240 mg N/L) largely enhanced the SCFAs production from PS to 355.8 mg chemical oxygen demand (COD)/g VSS, which was about 4.5-fold that of control (i.e., 80 mg COD/g VSS). Mechanism investigations showed that FA pretreatment greatly accelerated the PS solubilization and destroyed the integrity of EPS, and the easily biodegradable substrates in the fermentation broth increased significantly, providing microorganisms with more organics to convert into SCFAs. Further analyses displayed that FA greatly inhibited the methane production during fermentation, resulting in further accumulation of SCFAs. Given that the NH4+-N released during the fermentation can be converted into FAin situ, this could facilitate the transition of wastewater treatment plants operation from linear to circular mode.