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A Decontamination Process to Remove Metals and Stabilise Montreal Sewage Sludge

The Montreal Urban Community (MUC) treatment plant produces approximately 270 tons of dry sludge daily (tds/day) during physicochemical wastewater treatment. The sludges are burned and contribute to the greenhouse effect by producing atmospheric CO(2). Moreover, the sludge emanates a nauseating odou...

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Autores principales: Mercier, G., Blais, J.F., Hammy, F., Lounes, M., Sasseville, J.L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: TheScientificWorldJOURNAL 2002
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6009266/
https://www.ncbi.nlm.nih.gov/pubmed/12805970
http://dx.doi.org/10.1100/tsw.2002.201
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author Mercier, G.
Blais, J.F.
Hammy, F.
Lounes, M.
Sasseville, J.L.
author_facet Mercier, G.
Blais, J.F.
Hammy, F.
Lounes, M.
Sasseville, J.L.
author_sort Mercier, G.
collection PubMed
description The Montreal Urban Community (MUC) treatment plant produces approximately 270 tons of dry sludge daily (tds/day) during physicochemical wastewater treatment. The sludges are burned and contribute to the greenhouse effect by producing atmospheric CO(2). Moreover, the sludge emanates a nauseating odour during its thermal stabilisation and retains unpleasant odours for the part (25%) that is dried and granulated. To solve this particular problem, the treatment plant authorities are currently evaluating an acidic chemical leaching (sulfuric or hydrochloric acid) process at a pH between 2 and 3, using an oxidizing agent such as ferric chloride or hydrogen peroxide (METIX-AC technology, patent pending; [20]). They could integrate it to a 70 tds/day granulated sludge production process. Verification of the application of METIX-AC technology was carried out in a pilot plant set up near the sludge production plant of the MUC. The tests showed that METIX-AC technology can be advantageously integrated to the process used at the MUC. The residual copper (274 ± 58 mg/kg) and cadmium (5.6 ± 2.9 mg/kg) concentrations in the treated sludge meet legislation standards. The results have also shown that odours have been significantly eliminated for the dewatered, decontaminated, and stabilized biosolids (> 97%) compared to the non-decontaminated biosolids. A high rate of odour elimination also was obtained for the liquid leached biosolids (> 93%), compared to the untreated liquid biosolids. The fertilising value (N and P) is well preserved by the METIX-AC process. Dissolved organic carbon measurements have showed that little organic matter is brought in solution during the treatment. In fact, the average concentration of dissolved organic carbon measured in the treated liquid phase is 966 ± 352 mg/l, whereas it is 1190 ± 325 mg/l in untreated sludge. The treated sludge was first conditioned with an organic polymer and a coagulant aid. It was successfully dewatered with various dehydration equipments (filter press, rotary press, centrifuge).
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spelling pubmed-60092662018-07-04 A Decontamination Process to Remove Metals and Stabilise Montreal Sewage Sludge Mercier, G. Blais, J.F. Hammy, F. Lounes, M. Sasseville, J.L. ScientificWorldJournal Short Communication The Montreal Urban Community (MUC) treatment plant produces approximately 270 tons of dry sludge daily (tds/day) during physicochemical wastewater treatment. The sludges are burned and contribute to the greenhouse effect by producing atmospheric CO(2). Moreover, the sludge emanates a nauseating odour during its thermal stabilisation and retains unpleasant odours for the part (25%) that is dried and granulated. To solve this particular problem, the treatment plant authorities are currently evaluating an acidic chemical leaching (sulfuric or hydrochloric acid) process at a pH between 2 and 3, using an oxidizing agent such as ferric chloride or hydrogen peroxide (METIX-AC technology, patent pending; [20]). They could integrate it to a 70 tds/day granulated sludge production process. Verification of the application of METIX-AC technology was carried out in a pilot plant set up near the sludge production plant of the MUC. The tests showed that METIX-AC technology can be advantageously integrated to the process used at the MUC. The residual copper (274 ± 58 mg/kg) and cadmium (5.6 ± 2.9 mg/kg) concentrations in the treated sludge meet legislation standards. The results have also shown that odours have been significantly eliminated for the dewatered, decontaminated, and stabilized biosolids (> 97%) compared to the non-decontaminated biosolids. A high rate of odour elimination also was obtained for the liquid leached biosolids (> 93%), compared to the untreated liquid biosolids. The fertilising value (N and P) is well preserved by the METIX-AC process. Dissolved organic carbon measurements have showed that little organic matter is brought in solution during the treatment. In fact, the average concentration of dissolved organic carbon measured in the treated liquid phase is 966 ± 352 mg/l, whereas it is 1190 ± 325 mg/l in untreated sludge. The treated sludge was first conditioned with an organic polymer and a coagulant aid. It was successfully dewatered with various dehydration equipments (filter press, rotary press, centrifuge). TheScientificWorldJOURNAL 2002-04-26 /pmc/articles/PMC6009266/ /pubmed/12805970 http://dx.doi.org/10.1100/tsw.2002.201 Text en Copyright © 2002 G. Mercier et al. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Short Communication
Mercier, G.
Blais, J.F.
Hammy, F.
Lounes, M.
Sasseville, J.L.
A Decontamination Process to Remove Metals and Stabilise Montreal Sewage Sludge
title A Decontamination Process to Remove Metals and Stabilise Montreal Sewage Sludge
title_full A Decontamination Process to Remove Metals and Stabilise Montreal Sewage Sludge
title_fullStr A Decontamination Process to Remove Metals and Stabilise Montreal Sewage Sludge
title_full_unstemmed A Decontamination Process to Remove Metals and Stabilise Montreal Sewage Sludge
title_short A Decontamination Process to Remove Metals and Stabilise Montreal Sewage Sludge
title_sort decontamination process to remove metals and stabilise montreal sewage sludge
topic Short Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6009266/
https://www.ncbi.nlm.nih.gov/pubmed/12805970
http://dx.doi.org/10.1100/tsw.2002.201
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