Improving Methane Production from Waste Activated Sludge Assisted by Fe(II)-Activated Peroxydisulfate Pretreatment via Anaerobic Digestion: Role of Interspecific Syntrophism Mediated by Sulfate-Reducing Bacteria,ACS Sustainable Chemistry & Engineering

当前位置： X-MOL 学术 › ACS Sustain. Chem. Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Improving Methane Production from Waste Activated Sludge Assisted by Fe(II)-Activated Peroxydisulfate Pretreatment via Anaerobic Digestion: Role of Interspecific Syntrophism Mediated by Sulfate-Reducing Bacteria
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-02-08 , DOI: 10.1021/acssuschemeng.2c06686
Zhixuan Cui ₁ , Zhihong Liu ₁ , Yaxin Fan ₁ , Zhang-Wei He ₂ , Wenzong Liu ₃ , Xiuping Yue _{1,

4} , Aijuan Zhou _{1,

4}

Affiliation

Sulfate radical generated via peroxydisulfate (PDS) activation has been extensively applied to energy recovery from waste activated sludge (WAS) during anaerobic digestion (AD), while the residual sulfate is still a limitation for its further application. In this study, a novel coupling strategy of Fe(II)-activated PDS pretreatment [Fe(II)_PDS] with sulfate-reducing bacteria (SRB) mediated was explored to enhance methane yield from WAS during AD. Results showed that the similar methane yield was obtained in Fe(II)_PDS + SRB (16.6 mL/g VSS) and zero-valent iron (ZVI)_PDS + SRB (16.9 mL/g VSS), which enhanced by 19.9–56.5% than other groups, while the hydrolysis rate constant (0.0065 h^–1) in Fe(II)_PDS + SRB was much higher than that observed in ZVI_PDS + SRB (0.0046 h^–1). Meanwhile, the concentration of short-chain fatty acids (SCFAs) peaked at 360.9 mg COD/g VSS (5 d) in the Fe(II)_PDS + SRB group, with the acetic acid (HAc) and propionic acid (HPr) accumulative proportion of 73.5%, and the total concentration promoted by 28.5% than that of the ZVI_PDS + SRB group, which provided a more ideal substrate for methanogens. The ultimate utilization efficiency of SCFAs reached 62.4% in the Fe(II)_PDS + SRB group. Moreover, MiSeq sequencing, canonical correspondence analysis, and molecular ecological network analysis revealed the intrinsic interaction of the functional microbial consortia, that is, anaerobic fermentation bacteria, SRB, nitrate-reducing bacterium, and acetotrophic methanogen, with the abundances of 9.52, 2.4, 4.93, and 77.7% in the Fe(II)_PDS + SRB group. Considering the treatment performance and the difficulty of the subsequent disposal, Fe(II) may be the superior activator than ZVI for free radicals (i.e., SO₄^•– and HO^•) generation from PDS and further played the important role for interspecific syntrophism coupling with SRB during AD. Results of this study may provide a promising way for energy recovery from WAS.

中文翻译：

Fe(II) 活化过二硫酸盐预处理通过厌氧消化辅助废弃活性污泥提高甲烷产量：硫酸盐还原菌介导的种间共生作用

通过过二硫酸盐（PDS）活化产生的硫酸根已广泛应用于厌氧消化（AD）过程中废弃活性污泥（WAS）的能量回收，而残留的硫酸盐仍然是其进一步应用的限制。在这项研究中，探索了 Fe(II) 激活的 PDS 预处理 [Fe(II)_PDS] 与硫酸盐还原菌 (SRB) 介导的新型偶联策略，以提高 AD 期间 WAS 的甲烷产量。结果表明，Fe(II)_PDS + SRB (16.6 mL/g VSS) 和零价铁 (ZVI)_PDS + SRB (16.9 mL/g VSS) 获得了相似的甲烷产率，提高了 19.9–56.5% Fe(II)_PDS + SRB 中的水解速率常数 (0.0065 h ^–1 ) 远高于 ZVI_PDS + SRB 中观察到的水解速率常数 (0.0046 h ^–1). 同时，Fe(II)_PDS + SRB组短链脂肪酸(SCFAs)浓度峰值为360.9 mg COD/g VSS (5 d)，乙酸(HAc)和丙酸(HPr)累积比例达到73.5%，总浓度比ZVI_PDS+SRB组提升28.5%，为产甲烷菌提供了更理想的底物。Fe(II)_PDS + SRB组SCFAs的最终利用效率达到62.4%。此外，MiSeq测序、典型对应分析和分子生态网络分析揭示了厌氧发酵菌、SRB、硝酸盐还原菌和乙酸营养产甲烷菌等功能微生物群之间的内在相互作用，其丰度分别为9.52、2.4、 4.93，在 Fe(II)_PDS + SRB 组中为 77.7%。₄^•–和 HO ^• ) 从 PDS 产生，并进一步在 AD 期间与 SRB 的种间互养耦合中发挥重要作用。这项研究的结果可能为 WAS 的能量回收提供一种有前途的方法。

更新日期：2023-02-08

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南