The University of Southampton
University of Southampton Institutional Repository

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

Record type: Article

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.

PDF Co-digestion_of_mr-OFMSW_with_slaughterhouse_wastes___Zhang_and_Banks,_Scholar_text.pdf - Accepted Manuscript
Download (596kB)

Citation

Zhang, Y. and Banks, C.J. (2012) Co-digestion of the mechanically recovered organic fraction of municipal solid waste with slaughterhouse wastes Biochemical Engineering Journal, 68, (15), pp. 129-137. (doi:10.1016/j.bej.2012.07.017).

More information

e-pub ahead of print date: 25 July 2012
Published date: 15 October 2012
Keywords: naerobic processes, biodegradation, waste treatment, slaughterhouse waste, product inhibition, potentially toxic element
Organisations: Centre for Environmental Science

Identifiers

Local EPrints ID: 342078
URI: http://eprints.soton.ac.uk/id/eprint/342078
ISSN: 1369-703X
PURE UUID: f1f1b397-ac42-42b4-8623-9b3fb2805cbe
ORCID for Y. Zhang: ORCID iD orcid.org/0000-0002-5068-2260

Catalogue record

Date deposited: 13 Aug 2012 09:19
Last modified: 18 Jul 2017 05:31

Export record

Altmetrics


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×