DE2352474A1 - Soil-improving agents prodn from sewage sludge and refuse - by press moulding, drying and comminuting - Google Patents

Abstract

Storage-stable, odourless, biologically active soil-improving agents are produced by (a) press-moulding a mixt of partially dewatered sewage sludge (pref. with a water content of 70%) and comminuted refuse (esp. from a disintegrator) to reduce the vol. of the mass to ca. 1/3 without loss of water, (b) drying the resulting briquettes by storing in air for 4 (pref. ca. 3) weeks until the C:N ratio is =20, and (c) comminuting the briquettes and screening the product to give a particle size of 6mm. The product (a high-quality compost giving extremely good root growth) can be used directly without the prolonged rotting procedures associated with prior art processes.

Description

INDUSTRIAL PLANTS KARLSRUHE AUGSBURG Corporation

7500 Karlsruhe

Gartenstrasse Jl

Process for the production of storable, odorless and biologically active soil improvers (Addition to patent 1 145 646)

The invention relates to a process for the production of odorless and biologically active Boclon improvers from waste materials by processing and drying mixtures of garbage and sewage sludge, in which a mixture of partially dewatered sewage sludge, in particular sewage sludge with a water content below 70 % and shredded rubbish, in particular rubbish rubbish, a

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Compression molding with strong compression of the mass to about a third of its volume is subjected to without leakage of water and the compacts obtained in this way are dried by storage in the air, according to patent no. 1 l ¥ j> 646.

That of the German exposition No. 1 917 259 underlying Process can be found in the pressed garbage to ventilate artificially through breaths. Such ventilation implies the negotiation of appropriately suitable ones Containers as well as the subsequent rotting in piles or in heaps in advance.

It is obvious that the. to carry out the procedure according to the German Auslegeschrift 1 917 2J59 quite elaborate container structures as well as the additional ones for this Space requirements are just as disadvantageous as the crane systems required to load the containers and then again to be able to empty. The maturation and disinfection process within a time of about 5 to 4 weeks; it can therefore be assumed that this The process of maturation and disinfection does not occur until after much longer storage.

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In (main) patent no. 1 145 646, in which that in the Process known to experts under the "Brikollare process" is described, the disinfection takes place within 3 up to 4 weeks in ventilated stacks or by means of air ducts in the individual rubbish stones or briquettes. To After aeration, this process is followed by renewed moistening, so that the material can then be stored in heaps or in heaps within a relatively long time (about 4 to 5 months) can rot.

This method also requires a larger amount of space in the practical process. As a result of this, in turn, undesirable effects from the effects of the weather are to be feared because there are not always enough covered rooms available, such as halls or dip.

This is where the essence of the present invention begins, which has set itself the task of proceeding according to the (Main) patent 1,145,646 with regard to the recognized so far Improve inadequacies.

This object is achieved essentially in that the air-dried compacts after a storage time of less than four weeks and after reaching a carbon stick

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pulp ratios equal to or less than 20 are crushed again and then sieved in grain sizes of less than 6 mm.

In a further embodiment of the proposed invention, the storage time of the air-dried compacts is approximately three weeks.

It is both illuminating and convincing that with the proposed invention is associated with a number of advantages. So are according to the variant of the method mentioned above neither costly and elaborate storage container constructions nor, much less, crane and transport systems necessary; the crushed and sieved torment, In contrast, the product can be used without further treatment, e.g. B. Nachrife, be given to the consumer. The levy can be open or packaged, depending on requirements. The finished product is first class Ripe compost, but not the usual potting soil.

In planting trials with different types of grain, vegetables, forest seeds, etc. m. that was after the present Invention proposal treated and recovered material in changing layer heights between 1 to 4 cm high on one

• c topsoil applied. Subsequently, this material was

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• ■ _ 5 -

milled about 20 cm in order to examine the result. can. It turned out that in planters a surprisingly strong root penetration, previously unknown at this time, has set in, as a result of which the treated in this way Plants thrived beyond expectations. "

Documents considered

German Äüslegeschrift 1 917

509818/0506

Claims (2)

Claims 1. Method of making storable, odorless and biologically active soil improvers from waste materials by processing and drying * of te *. Mixtures of garbage and sewage sludge, in which a mixture of partially dewatered sewage sludge, in particular sewage sludge with a water content of less than 70 % and shredded waste, in particular waste grated, undergoes a compression deformation with strong compression of the mass to up to about a third of its volume without water aur; -t -ritt .unterwehen and the resulting pro ßl in; o be dried by storing in the air, according to patent, no. 1 1 ^ 5 6k6,
characterized, that the air-dried pellets after a storage tent of less than four weeks and after a carbon-nitrogen ratio has been reached of the same or smaller size again and then sieved to grain sizes of less than 6 mm. 2. The method according to claim 1,
characterized, that the storage time of the air-dried compacts is about three weeks. 509818/0508
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