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公开(公告)号：CA1172390A
公开(公告)日：1984-08-07
申请号：CA390301
申请日：1981-11-18
Applicant: BASF AG
Inventor： SANDER BRUNO , LAUER HERBERT , NEUWIRTH MANFRED
Abstract: A process for dewatering sewage sludges by mixing these homogeneously with additives, such as finely divided coal or ash or mixtures thereof, adding organic flocculants, removing the greater part of the water, in a first dewatering step, by gravity filtration without applying a pressure differential and then dewatering more thoroughly in a second dewatering step, by pressure filtration on filter presses, wherein the additives, such as finely divided coal or ash or mixtures thereof, are added in an amount of from 0.5 to 1.5 parts by weight per part by weight of sludge solids and from 1 to 7 kg of organic flocculant/tonne of sludge solids is added to the sewage sludges before or during admixture of the additives.
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公开(公告)号：CA1172391A
公开(公告)日：1984-08-07
申请号：CA390331
申请日：1981-11-18
Applicant: BASF AG
Inventor： SANDER BRUNO , LAUER HERBERT , NEUWIRTH MANFRED
Abstract: A process for dewatering sewage sludges of which the sludge solids contain less than 70% of organic matter, and whose dewatering characteristics have been improved by adding organic flocculants, on a filter press, wherein the sewage sludges are concentrated by adding an organic flocculant during thickening by gravity sedimentation from 0.5-5,0% by weight of sludge solids to 6-14, and especially 8-12, % by weight of sludge solids, the sewage sludges are mixed with additives, such as finely divided coal or ash or mixtures thereof, in an amount of from 0.5 to 1.5 parts by weight per part by weight of sludge solids, and the sludges are treated, before, during or after admixture of the additives, with a further 2-8 kg of organic flocculant/tonne of sludge solids and are then dewatered on the filter press.
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公开(公告)号：DD202132A5
公开(公告)日：1983-08-31
申请号：DD23498581
申请日：1981-11-19
Applicant: BASF AG
Inventor： SANDER BRUNO , LAUER HERBERT , NEUWIRTH MANFRED
Abstract: 1. A multistage process for dewatering sewage sludges by mixing these homogeneously with inert additives, such as finely divided coal or ash or mixtures thereof, adding organic flocculants, removing the greater part of the water, in a first dewatering step, by gravity filtration without applying a pressure differential and then effecting further dewatering in a second dewatering step, by pressure filtration on filter presses, in order to obtain filter cakes which can be combusted, with the utilization of their calorific content, wherein the additives, such as finely divided coal or ash or mixtures thereof, are added in an amount of from 0.5 to 1.5 parts by weight per part by weight of sludge solids and from 1 to 7 kg of organic flocculant/tonne of sludge solids is added to the sewage sludges before or during admixture of the additives.
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公开(公告)号：DD201878A5
公开(公告)日：1983-08-17
申请号：DD23498781
申请日：1981-11-19
Applicant: BASF AG
Inventor： SANDER BRUNO , LAUER HERBERT , NEUWIRTH MANFRED
Abstract: 1. A multistage process for dewatering sewage sludges of which the sludge solids contain less than 70% of organic matter, and whose dewatering characteristics have been improved by adding organic flocculants, on a filter press, using inert additives, wherein the sewage sludges are concentrated, by adding an organic flocculant during thickening by gravity sedimentation, from 0.5-5.0% by weight of sludge solids to 6-14, and especially 8-12, % by weight of sludge solids, the sewage sludges are mixed with additives, such as finely divided coal or ash or mixtures thereof, in an amount of from 0.5 to 1.5 parts by weight per part by weight of sludge solids, and the sludges are treated, before, during or after admixture of the additives, with a further 2-8 kg of organic flocculant/tonne of sludge solids and are then dewatered on the filter press to produce filter cakes which can be combusted with the utilization of their calorific content.
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