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    METHOD OF DEWATERING SEWAGE SLUDGE IN FILTER PRESSES
    31.
    发明专利
    METHOD OF DEWATERING SEWAGE SLUDGE IN FILTER PRESSES 未知

    公开(公告)号：DE3163660D1

    公开(公告)日：1984-06-20

    申请号：DE3163660

    申请日：1981-10-12

    Applicant: BASF AG

    Inventor： SANDER BRUNO DR ,  LAUER HERBERT DR ,  NEUWIRTH MANFRED

    IPC: B01D25/12 ,  B01D37/00 ,  B01D37/03 ,  C02F1/54 ,  C02F11/12 ,  C02F11/14

    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.

    METHOD OF DEWATERING SLUDGES CONTAINING MINERAL OILS WITH RECOVERY OF THE OIL FRACTION
    32.
    发明专利
    METHOD OF DEWATERING SLUDGES CONTAINING MINERAL OILS WITH RECOVERY OF THE OIL FRACTION 未知

    公开(公告)号：DE3162987D1

    公开(公告)日：1984-05-10

    申请号：DE3162987

    申请日：1981-10-24

    Applicant: BASF AG

    Inventor： SANDER BRUNO DR ,  HOVEMANN FRIEDRICH DR ,  SCHERLING KURT

    IPC: B01D17/00 ,  B01D37/00 ,  C02F11/12 ,  C02F11/14 ,  C10G33/00 ,  C10G33/04

    Abstract: A process for dewatering petroleum-containing sludges by a two-stage method using finely divided additives and organic flocculants, wherein (a) finely divided additives, such as ash, coal, sand or mixtures of these, in a free-flowing form or as an aqueous suspension, are homogeneously dispersed in the petroleum-containing sludge, in an amount such that the total solids content of the resulting mixture is from 10 to 30% by weight, especially from 12 to 20% by weight, (b) this sludge mixture is treated with an aqueous solution of an organic flocculant, preferably of anionic nature, (c) the greater part of the sludge water is removed by gravity filtration, (d) the pre-dewatered sludge mixture is treated with an aqueous solution of aluminum salts or trivalent iron salts and (e) this mixture is substantially dewatered by pressure filtration, in the course of which the greater part of the petroleum present is also removed.

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