Zerovalent Iron Effectively Enhances Medium-Chain Fatty Acids Production from Waste Activated Sludge through Improving Sludge Biodegradability and Electron Transfer Efficiency.,Environmental Science & Technology

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Zerovalent Iron Effectively Enhances Medium-Chain Fatty Acids Production from Waste Activated Sludge through Improving Sludge Biodegradability and Electron Transfer Efficiency.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-07-27 , DOI: 10.1021/acs.est.0c03029
Yun Wang ₁ , Wei Wei ₁ , Shu-Lin Wu ₁ , Bing-Jie Ni _{1,

2}

Affiliation

A novel zerovalent iron (ZVI) technique to simultaneously improve the production of medium-chain fatty acids (MCFAs) from waste activated sludge (WAS) and enhance WAS degradation during anaerobic WAS fermentation was proposed in this study. Experimental results showed that the production and selectivity of MCFAs were effectively promoted when ZVI was added at 1–20 g/L. The maximum MCFAs production of 15.4 g COD (Chemical Oxygen Demand)/L and MCFAs selectivity of 71.7% were both achieved at 20 g/L ZVI, being 5.3 and 4.8 times that without ZVI (2.9 g COD/L and 14.9%). Additionally, ZVI also promoted WAS degradation, which increased from 0.61 to 0.96 g COD/g VS when ZVI increased from 0 to 20 g/L. The microbial community analysis revealed that the ZVI increased the populations of key anaerobes related to hydrolysis, acidification, and chain elongation. Correspondingly, the solubilization, hydrolysis, and acidification processes of WAS were revealed to be improved by ZVI, thereby providing more substrates (short-chain fatty acids (SCFAs)) for producing MCFAs. The mechanism studies showed that ZVI declined the oxidation–reduction potential (ORP), creating a more favorable environment for the anaerobic biological processes. More importantly, ZVI with strong conductivity could act as an electron shuttle, contributing to increasing electron transfer efficiency from electron donor to acceptor. This strategy provides a new paradigm of transforming waste sludge into assets by a low-cost waste to bring significant economic benefits to sludge disposal and wastewater treatment.

中文翻译：

零价铁通过提高污泥的生物降解性和电子转移效率，有效地提高了废活性污泥的中链脂肪酸产量。

本研究提出了一种新颖的零价铁（ZVI）技术，该技术可同时提高废活性污泥（WAS）产生的中链脂肪酸（MCFA）的产量并增强厌氧WAS发酵过程中WAS的降解。实验结果表明，当ZVI加入1-20 g / L时，MCFA的产生和选择性得到了有效的促进。在20 g / L ZVI下，MCFA的最大产量为15.4 g COD（化学需氧量）/ L，MCFA选择性为71.7％，分别是不使用ZVI（2.9 g COD / L和14.9％）的5.3和4.8倍。此外，ZVI还促进了WAS降解，当ZVI从0增加到20 g / L时，WAS降解从0.61增加到0.96 g COD / gVS。微生物群落分析表明，ZVI增加了与水解，酸化，和链伸长。相应地，ZVI显示WAS的增溶，水解和酸化过程得到了ZVI的改善，从而为生产MCFA提供了更多的底物（短链脂肪酸（SCFA））。机理研究表明，ZVI降低了氧化还原电位（ORP），为厌氧生物过程创造了更有利的环境。更重要的是，具有强电导率的ZVI可以充当电子梭，从而有助于提高电子从电子供体到受体的转移效率。该策略提供了一种通过低成本废物将废物污泥转化为资产的新范例，从而为污泥处置和废水处理带来了显着的经济效益。ZVI揭示了WAS的酸化和酸化过程可以改善，从而为生产MCFA提供了更多的底物（短链脂肪酸（SCFA））。机理研究表明，ZVI降低了氧化还原电位（ORP），为厌氧生物过程创造了更有利的环境。更重要的是，具有强电导率的ZVI可以充当电子梭，从而有助于提高电子从电子供体到受体的转移效率。该策略提供了一种通过低成本废物将废物污泥转化为资产的新范例，从而为污泥处置和废水处理带来了显着的经济效益。ZVI揭示了WAS的酸化和酸化过程可以改善，从而为生产MCFA提供了更多的底物（短链脂肪酸（SCFA））。机理研究表明，ZVI降低了氧化还原电位（ORP），为厌氧生物过程创造了更有利的环境。更重要的是，具有强电导率的ZVI可以充当电子梭，从而有助于提高电子从电子供体到受体的转移效率。该策略提供了一种通过低成本废物将废物污泥转化为资产的新范例，从而为污泥处置和废水处理带来了显着的经济效益。机理研究表明，ZVI降低了氧化还原电位（ORP），为厌氧生物过程创造了更有利的环境。更重要的是，具有强电导率的ZVI可以充当电子梭，从而有助于提高电子从电子供体到受体的转移效率。该策略提供了一种通过低成本废物将废物污泥转化为资产的新范例，从而为污泥处置和废水处理带来了显着的经济效益。机理研究表明，ZVI降低了氧化还原电位（ORP），为厌氧生物过程创造了更有利的环境。更重要的是，具有强电导率的ZVI可以充当电子梭，从而有助于提高电子从电子供体到受体的转移效率。该策略提供了一种通过低成本废物将废物污泥转化为资产的新范例，从而为污泥处置和废水处理带来了显着的经济效益。

更新日期：2020-09-01

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