Process for removing or separating pollutants from waste gases
First Claim
1. A process for removing or separating pollutants including heavy metal pollutants and SO2 from flue gas comprising the following step:
- contacting the flue gas having said heavy metal pollutants and less than or equal to 1.0% by weight of SO2, with a binder suspension consisting essentially of sludge in an aqueous suspension having 2 to 10% sludge solids consisting of digested sewage sludge.
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Abstract
The invention relates to a process for the removal or separation of pollutants, such as sulphur or metal compounds from waste gases, by contacting the waste gases with aqueous binder suspensions, comprising using a sewage sludge as the binder suspension. The binder suspension is preferably constituted by a sewage sludge mixed with comminuted, dried autumn leaves or an extraction residue thereof and to which are added further additives, particularly alkaline substances. Apart from the excellent manner in which sewage sludge binds pollutants, roasting is made more economic due to the high carbon content of the sewage sludge.
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Citations
19 Claims
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1. A process for removing or separating pollutants including heavy metal pollutants and SO2 from flue gas comprising the following step:
contacting the flue gas having said heavy metal pollutants and less than or equal to 1.0% by weight of SO2, with a binder suspension consisting essentially of sludge in an aqueous suspension having 2 to 10% sludge solids consisting of digested sewage sludge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A process for removing or separating pollutants including heavy metal pollutants and SO2 from flue gas comprising the following step:
contacting the flue gas having said heavy metal pollutants and less than or equal to 1.0% by weight of SO2, with a binder suspension consisting essentially of sludge in an aqueous suspension having 2 to 10% sludge solids consisting of a member of the group consisting of digested sewage sludge, excavator sludge and dredger sludge.
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19. A process for removing or separating pollutants including heavy metal pollutants and SO2 from flue gas consisting of the following step:
contacting the flue gas having said heavy metal pollutants and less than or equal to 1.0% by weight of SO2, with a binder suspension consisting essentially of sludge in an aqueous suspension having 2 to 10% sludge solids consisting of digested sewage sludge.
Specification