Abstract
The fermentative production of short-chain fatty acids (SCFAs) from waste-activated sludge is promising; however, slow sludge hydrolysis makes it difficult to practically apply. Herein, a novel pretreatment method combining thermal hydrolysis (TH) and polyoxometalates (POMs) was evaluated for improving the yield of SCFAs in sludge anaerobic fermentation. After TH (140 °C, 30min) and POM (0.05g/g TSS, 120min) pretreatment, the maximum yield of SCFAs increased by 66.2%, from 2684 ± 67mg COD/L to 4461 ± 36mg COD/L, and the percentage of acetic acid increased by 29.5%, from 23.9 ± 3.4% to 53.4 ± 0.5%. POMs disrupted the floc structure of TH-treated sludge by electro-neutralization and destroyed cells by inducing reactive oxygen species. Additionally, POMs mitigated the adverse effects of TH on acid-producing bacteria and enhanced the acetic acid fermentation pathway. TH-POMs pretreatment effectively solved the problem of slow sludge hydrolysis and provided an alternative technology to enhance SCFA production from sludge.
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