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Co-digestion of the mechanically recovered organic fraction of municipal solid waste with slaughterhouse wastes

Paper ID Volume ID Publish Year Pages File Format Full-Text
3482 172 2012 9 PDF Available
Title
Co-digestion of the mechanically recovered organic fraction of municipal solid waste with slaughterhouse wastes
Abstract

The current work aimed to resolve some long-standing questions about the potential benefits and limitations of co-digestion of slaughterhouse wastes. To achieve this, a laboratory-scale trial was carried out using the mechanically recovered organic fraction of municipal solid waste mixed with either sheep blood or a mixture of pig intestines with flotation fat. Both of these co-substrates are difficult to digest in isolation because of their high nitrogen and lipid concentrations, and are regulated as Category 3 materials under the Animal By-Products Regulations (EC 1069/2009). The results showed that at an organic loading rate of 2 kg VS m−3 day−1 with the slaughterhouse material making up 20% of the load on a volatile solids basis the process could operate successfully. As the loading was increased to 4 kg VS m−3 day−1 signs of inhibition appeared with both co-substrates, however, and volumetric methane production was reduced to a point where co-digestion gave no process advantage. The main operational problem encountered was an increase in the concentration of volatile fatty acids in the digestate, particularly propionic acid: this was thought to be a result of ammonia toxicity. The concentration of potentially toxic elements in the digestate made it unsuitable for agricultural application for food production, although the increased nitrogen content made it more valuable as a fertiliser for non-food crop use.

► Co-digestion of OFMSW wastes with slaughterhouse wastes was possible. ► High loadings produced some inhibition attributable to the co-substrates. ► The PTE content of digestates was unsuitable for agricultural food production. ► Co-substrates improved the nutrient balance of the final digestate product.

Keywords
Anaerobic processes; Biodegradation; Waste treatment; Slaughterhouse waste; Product inhibition; Potentially toxic element
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 68, 15 October 2012, Pages 129–137
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us