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Treatment of a high-strength sulphate-rich alkaline leachate using an anaerobic filter

Treatment of a high-strength sulphate-rich alkaline leachate using an anaerobic filter
Treatment of a high-strength sulphate-rich alkaline leachate using an anaerobic filter
The research looks at the feasibility of treating an alkaline sulphate-rich leachate arising from the co-disposal of municipal solid waste with cement kiln dust by means of an anaerobic filter (AF). This type of leachate with a high sulphate concentration is commonly prohibited for discharge to sewer and requires an on-site treatment solution. The AF used had a working volume of 4 l and contained reticulated polyurethane foam as the biomass support material. The filters were operated over a 152 day experimental period during which the COD loading onto the filter was increased from 0.76 to 7.63 kg COD m?3 d?1. In the early stages of operation at low loading, soluble sulphides accumulated that inhibited methanogenic activity. This was restored by dosing FeCl3 to the reactor. The continued dosing allowed efficient COD removal of between 75% and 90% until the nominal retention time in the reactor was 3 days, at which point reactor performance declined significantly. The main mechanism for COD removal was by sulphate-reducing bacteria, which also resulted in up to 88% sulphate removal from the leachate. The average methane generation rate was 0.10 l g?1 COD removed. The results indicate the potential for using this approach as a pre-treatment that could significantly reduce the COD load to a second stage treatment process, but problems associated with the implementation of the technology at a larger scale have been identified
0956-053X
359-366
Banks, C.J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Wang, Z.
8983928f-aca4-4b48-a71b-959646c6aa77
Banks, C.J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Wang, Z.
8983928f-aca4-4b48-a71b-959646c6aa77

Banks, C.J. and Wang, Z. (2007) Treatment of a high-strength sulphate-rich alkaline leachate using an anaerobic filter. Waste Management, 27 (3), 359-366. (doi:10.1016/j.wasman.2006.01.028).

Record type: Article

Abstract

The research looks at the feasibility of treating an alkaline sulphate-rich leachate arising from the co-disposal of municipal solid waste with cement kiln dust by means of an anaerobic filter (AF). This type of leachate with a high sulphate concentration is commonly prohibited for discharge to sewer and requires an on-site treatment solution. The AF used had a working volume of 4 l and contained reticulated polyurethane foam as the biomass support material. The filters were operated over a 152 day experimental period during which the COD loading onto the filter was increased from 0.76 to 7.63 kg COD m?3 d?1. In the early stages of operation at low loading, soluble sulphides accumulated that inhibited methanogenic activity. This was restored by dosing FeCl3 to the reactor. The continued dosing allowed efficient COD removal of between 75% and 90% until the nominal retention time in the reactor was 3 days, at which point reactor performance declined significantly. The main mechanism for COD removal was by sulphate-reducing bacteria, which also resulted in up to 88% sulphate removal from the leachate. The average methane generation rate was 0.10 l g?1 COD removed. The results indicate the potential for using this approach as a pre-treatment that could significantly reduce the COD load to a second stage treatment process, but problems associated with the implementation of the technology at a larger scale have been identified

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Published date: March 2007

Identifiers

Local EPrints ID: 53679
URI: https://eprints.soton.ac.uk/id/eprint/53679
ISSN: 0956-053X
PURE UUID: 7141095e-d96e-41ad-bc2f-e8bec9215879

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Date deposited: 17 Jul 2008
Last modified: 13 Mar 2019 20:40

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