Optimization of synergistic microwave and zero–valent iron co–pretreatment for anaerobic digestion of waste activated sludge

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-04-22 DOI:10.1016/j.biortech.2025.132568

Seung–han Ha , Seung Gu Shin , Johng–Hwa Ahn

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Abstract

This study optimized co-pretreatment of microwave temperature (T_MW) and zero-valent iron dosage ([ZVI]) to enhance anaerobic digestion (AD) of waste activated sludge (WAS). WAS was pretreated at T_MW = 100, 150, or 200 °C and [ZVI] = 1, 3, or 5 g/L using a central composite design. Optimal co-pretreatment (T_MW = 168 °C and [ZVI] = 5 g/L) reduced the ratio of volatile solids (VS) to total solids by 21.5 %, increased the solubilization ratio seven–fold, removed 53.5 % of phosphate compared to WAS partly because of lignin fragmentation. Biochemical methane potential identified optimal conditions (T_MW = 164 °C and [ZVI] = 4.8 g/L), enhancing VS removal by 70.9 %, methane yield by 60 %, and reducing hydrogen sulfide by 82.4 % compared to Control. Kinetic analysis indicated 61 – 108 % increase in maximum methane production rate. Microbial analysis revealed increased acetoclastic methanogens and decreased hydrogenotrophic methanogens. Thus, microwave–ZVI co-pretreatment enhanced WAS biodegradability and AD efficiency.

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微波与零价铁协同预处理废活性污泥厌氧消化工艺优化

本研究优化了微波温度（TMW）和零价铁用量（[ZVI]）的协同预处理，以促进废活性污泥（WAS）的厌氧消化（AD）。采用中心复合设计，在TMW = 100、150或200°C和[ZVI] = 1、3或5 g/L下预处理WAS。最佳共预处理（TMW = 168℃，[ZVI] = 5 g/L）使挥发性固形物（VS）与总固形物之比降低了21.5%，增溶率提高了7倍，磷酸盐去除率为53.5%，部分原因是木质素的破碎。生化甲烷势确定了最佳条件（TMW = 164°C, [ZVI] = 4.8 g/L），与对照相比，VS去除率提高了70.9%，甲烷产率提高了60%，硫化氢减少了82.4%。动力学分析表明，最大产甲烷率提高61 ~ 108%。微生物分析显示，产甲烷菌增加，氢营养型产甲烷菌减少。因此，微波- zvi共预处理提高了WAS的生物降解性和AD效率。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.