Abstract
The study proposed the extent and possible mechanisms of zero valent iron (ZVI) pretreatment on the generation of short-chain fatty acids (SCFAs) in alkaliphilic anaerobic fermentation of OTC-containing excess sludge at first. The results indicated that ZVI increased SCFAs yields. The SCFAs production reached 1523.12 ± 7.8 mg COD/g VSS at 20 g/L of ZVI addition, which increased by 62.70% (Day 6). The extra-cellular polymeric substances (EPS) and interior sludge cells was destructed by the speed of ZVI. The enrichment of hydrolytic acidifying bacteria was more favorable when ZVI was added at 20 g/L, and Bacillus, Hydrotalea and Thauera have become the main dominant species. Meanwhile, Pseudomonas was a potential oxytetracycline-degrading bacterium. In conclusion, the ZVI pre-treatment successfully improved acid production and pollutant removal in the OTC-containing excess sludge, achieving the dual benefits of sludge recycling and pollutant reduction.
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This research was supported by the Science and Technology Program of Gansu Province (22YF7GA143).
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Wang, Y., Chen, Y. (2025). Performance of Zero-Valent Iron Enhancing Short-Chain Fatty Acids Production During Alkaliphilic Anaerobic Fermentation of OTC-Containing Excess Sludge. In: Sun, Z., Das, P.K. (eds) Proceedings of the 11th International Conference on Energy Engineering and Environmental Engineering. ICEEEE 2024. Environmental Science and Engineering. Springer, Cham. https://doi.org/10.1007/978-3-031-76208-6_5
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DOI: https://doi.org/10.1007/978-3-031-76208-6_5
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