1. Green synthesis of Fe3O4@ceramsite from sludge improving anaerobic digestion performance of waste activated sludge.
- Author
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Zhang, Pengqu, Shen, Dongsheng, Shao, Jinyang, He, Xiaoyu, Zeng, Jianjun, Wu, Shu-Lin, Long, Yuyang, Wei, Wei, and Ni, Bing-Jie
- Subjects
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ANAEROBIC digestion , *IRON oxides , *ACTIVATED sludge process , *DIGESTION , *SEWAGE sludge digestion , *HOPPING conduction , *WASTE management , *POROSITY - Abstract
Anaerobic digestion (AD) is a promising technique for waste management, which can achieve sludge stabilization and energy recovery. This study successfully prepared Fe 3 O 4 @ceramsite from WAS and applied it as an additive in sludge digestion, aiming to improve the conversion of organics to biomethane efficiency. Results showed that after adding the Fe 3 O 4 @ceramsite, the methane production was enhanced by 34.7% compared with the control group (88.0 ± 0.1 mL/g VS). Further mechanisms investigation revealed that Fe 3 O 4 @ceramsite enhanced digesta stability by strong buffering capacity, improved sludge conductivity, and promoted Fe (III) reduction. Moreover, Fe 3 O 4 @ceramsite has a larger surface area and better porous structure, which also facilitated AD performance. Microbial community analysis showed that some functional anaerobes related to AD such as Spirochaeta and Smithella were enriched with Fe 3 O 4 @ceramsite treatment. Potential syntrophic metabolisms between syntrophic bacteria (Syntrophomonas , associated with DIET) and methanogens were also detected in the Fe 3 O 4 @ceramsite treatment AD system. • Fe 3 O 4 @ceramsite promoted methane production from WAS digestion. • Fe 3 O 4 @ceramsite enhanced digesta stability and sludge organics dissolution. • Larger surface area and better pore structure of Fe 3 O 4 @ceramsite facilitated AD performance. • Some functional anaerobes related to AD were enriched. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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