Back to Search
Start Over
Mechanism study of improving anaerobic co-digestion performance of waste activated sludge and food waste by Fe3O4
- Source :
- Journal of Environmental Management. 300:113745
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- A large amount of waste activated sludge (WAS) and food waste (FW) are produced every year in China. Anaerobic co-digestion is considered to be an effective way to solve this problem. This study applied FW/WAS mixture as co-substrate to create different digestive environment, aiming to understand the mechanism of Fe3O4 particles in promoting AD performance. The results showed that the addition of Fe3O4 presented various performances when facing different digestive acidification stress brought by different mixing ratios of WAS and FW. Methanogenic pathways and microbial communities varied with substrates’ properties. For group A (WAS mono-digestion), the acetoclastic methanogens dominated, 20 mg/g VS (according to the iron element) Fe3O4 could promote methane production, while 200 mg/g VS Fe3O4 would inhibit microbial activity. The promoted methane production by Fe3O4 was attributable to the promotion of sludge hydrolysis. For group B (WAS: FW = 1:0.5, based on VS addition, similarly hereinafter), Fe3O4 triggered direct interspecific electron transfer (DIET) between bacteria and methanogens. For group C (WAS: FW = 1:1), the hydrogenotrophic methanogens dominated, bacteria excreted more non-conductive polysaccharides in EPS to resist unfavorable environment, thereby it prevented their contact with Fe3O4 particles. So, it was difficult for Fe3O4 to trigger DIET and promote the digestive performance of batch experiments in such condition.
- Subjects :
- chemistry.chemical_classification
Environmental Engineering
biology
General Medicine
Management, Monitoring, Policy and Law
Polysaccharide
biology.organism_classification
Food waste
Hydrolysis
Extracellular polymeric substance
Activated sludge
Microbial population biology
chemistry
Food science
Waste Management and Disposal
Anaerobic exercise
Bacteria
Subjects
Details
- ISSN :
- 03014797
- Volume :
- 300
- Database :
- OpenAIRE
- Journal :
- Journal of Environmental Management
- Accession number :
- edsair.doi...........2e33a1add0052a4154a04bd5d512980a