JOURNAL OF LIGHT INDUSTRY

CN 41-1437/TS  ISSN 2096-1553

Volume 40 Issue 4
August 2025
Article Contents
JIN Baodan, WANG Jiacheng, DU Jingyu, et al. The acid production performance of co-fermentation between food industry waste and low organic matter residual sludge[J]. Journal of Light Industry, 2025, 40(4): 115-126. doi: 10.12187/2025.04.013
Citation: JIN Baodan, WANG Jiacheng, DU Jingyu, et al. The acid production performance of co-fermentation between food industry waste and low organic matter residual sludge[J]. Journal of Light Industry, 2025, 40(4): 115-126. doi: 10.12187/2025.04.013 shu

The acid production performance of co-fermentation between food industry waste and low organic matter residual sludge

  • Received Date: 2024-04-17
    Accepted Date: 2024-07-20
  • To simultaneously address the treatment and disposal issues of food industry production waste and low organic matter residual sludge, these two wastes were co-fermented. The performance of H0,H1, H2 and H3 co-fermentation systems under mass ratios of 0∶1.0, 0.5∶1.0, 1.0∶1.0 and 1.5∶1.0 was evaluated. Results indicated that food industry production waste introduction significantly reduced hydrolysis performance but enhanced acidification performance of the co-fermentation systems. In the H3 system, COD and volatile SCFAs concentrations reached their maximum, being 2.83-fold and 2.30-fold higher than those in H0, respectively. As food industry production waste dosage increased, NH+4—N concentration decreased markedly (31.9% of H0 in H3), while PO3-4—P remained low (≤1.01 mg/L) due to Ca3(PO4)2 and CaNH4PO4 precipitates. Enzyme activities varied: protease, acid phosphatase, and butyrate kinase decreased; α-glucosidase and alkaline phosphatase increased; dehydrogenase was less affected; acetate kinase initially rose then declined. Appropriate food industry production waste introduction also enriched functional microorganisms, including Firmicutes (dominant acetic acid-producing phylum, 63.1% in H2), Proteobacteria, Actinobacteriota, and Bacteroidota. Thus, food industry production waste addition enables efficient acid production in low organic matter residual sludge co-fermentation systems.
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