NL8403274A - Prepn. of liq. prod. from worm manure - by grinding aq. suspension contg. thickener, and adding water - Google Patents

Abstract

A liq. prod. is prepd. from worm manure by (a) freeing the solid biological conversion prod. from coarse particles, (b) suspending it in water, with a small amt. of polysaccharides gum as thickener, (c) removing residual solid impurities, (d) grinding the suspension to particle size not more than 500 microns, and (e) making up the ground prod. with water to the final suspension and adding a small amt. of polysaccharide gum and opt. a bactericide. The pref. polysaccharide gum is xanthan gum, used in a total amt. of 0.05-0.5%. A K and/or phosphate salt and/or NH4OH may be included.

Description

P & c «* A,, .. - S 6233-1 Ned. elz / kk 4

Short designation: Process for preparing a liquid worm manure preparation.

Worm manure is a known solid product, which is obtained by having biodegradable organic waste collected in culture reservoirs consumed.

The fermented product which has passed the recoveries is an odorless solid, which is used as a plant fertilizer. Obviously, this material is not homogeneous and, moreover, it contains natural sand and other particles that were present in the original organic waste.

For various purposes it would be desirable to prepare a liquid product from this manure so that it can be easily applied by spraying or the like. However, this requires a product that is completely liquid, because otherwise residual solids therein would clog the application equipment quickly. Furthermore, the material to be used as food for the plants also goes completely into the liquid phase, either as a solution or as a suspension, since a residual solid phase can be filtered off, but also for the purpose of use is lost.

So far, no attempt has been made to find a method with which. -1 these objectives could be achieved.

A method has now been found with which the desired results can be largely or even wholly obtained.

The invention relates to a process for the preparation of a liquid preparation of worm manure, which is characterized in that the solid biological conversion product is freed from coarse particles, then it is made into a suspension in water with a small amount of polysaccharide gum as a thickener, residual remove solid impurities, grind the slurry to a particle size of up to 500 µm and mix the ground product until final suspension with water and add a small amount of the peiysic acid mixture and optionally a bactericide.

The worm culture fermentation product is also referred to as vermicompost, and this term will also be used below.

The general procedure is as follows:

In the first step, the vermicompost is freed from coarse particles, preferably on a vibrating sieve with a mesh size of 5-8 mm. The Ver-micro-post generally has a moisture content of 45-55% and is applied in an amount of 500 kg / hour to, for example, a vibrating turbo screen. This removes the coarse impurities.

In the second step, the Vermicompost is dispersed in water.

0 4 'y 3 2 7 4 * * - 2 - - i * Γ \ - for this one can conveniently use a shakevai with, for example, a paddle stirrer. Water or an aqueous solution of further additives to be discussed below is added, the vermicompost preferably constituting about 60-40% of the mixture. The polysaccharide form 5 is used in this step in an amount of 0.05-0.5%. A particularly suitable polysaccharide gum has been found to be xanthan gum, of which a small amount (about 0.1%) is sufficient at this stage. In addition, one can add phosphate and / or potassium salt, which are then conveniently dissolved in the water to be used.

The shaking vessel is suitably connected to a pump, which makes it possible to recirculate the mass and discharge it in certain quantities with a suitable control system.

In the third step, any remaining small particles of foreign materials are removed from the suspension thus obtained. In general, the original vermicompost still contains higher specific gravity materials such as sand, metal materials and others. These must be removed to avoid damage to grinders and other machines. This is done by passing the slurry into a continuously operating decanter, in which materials of higher specific gravity are separated. A suitable decanter is, for example, a conical bottom vessel with a low speed mixer. The slurry is introduced into the lower part of the decanter and exits through the upper part, from which it is fed to the milling operation via a pump. From time to time the materials 25 accumulated in the bottom part can be removed.

In the fourth step, the suspension is ground. For this purpose, different types of grinding devices can be used, all of which operate satisfactorily. Naturally, the choice depends somewhat on the nature of the vermicompost and the desired end product. Products for ultimately forming a normal liquid can be ground with a turbo shaker or turbo grinder, for example the machine known under the name "Turax".

These machines require very thick suspensions and are capable of forming grain sizes between 500 and 100 Jun. Products intended for specific applications (fertilizer irrigation) must be milled with microsphere devices 35 to obtain granules of less than 100 µm.

Finally, in a fifth step, the ground product is brought to the desired thickness by adding a further amount of polysaccharide gum in water. Preferably the same gum is used as in step 2, but if desired, another gum can also be used. In addition, suitable bactericides and, if desired, also ammonia or ammonia salts can be added at this stage. Conveniently continuous operation is possible by continuously feeding the ground product into a shaking vessel and adding thereto the previously prepared gum solution and any further ingredients. The shaking promotes the rapid formation of a well-thickened product, which can then be directly fed to a branching station. The amount of the gum added at this stage can be 0.05-0.5%; in a preferred embodiment, about 0.1% xanthan gum is added. A suitable bactericide for addition at this stage is, for example, the commercial product Köbate C, which can be used in this step in an amount of 1-5%.

When prepared according to the above directions, a product was obtained with the following composition: Water 100 1

Vermicompost 25 kg

Xanthan gum (commercial product Phodopol 23) 0.2-0.3%

Bactericide (commercial product Kobate C) 0.3% 30% ammonia 18 kg 20 Na3PC> 4 10 kg KN03 5.5 kg

It should also be noted that another suitable thickener is, for example, the commercial product Clarsol ATC, which should be used in slightly larger amounts (0.5-0.8%). Furthermore, the amounts of ammonia and potassium and phosphate salt can, of course, be adjusted as desired and depending on the nature and purpose of the product.

8403274

Claims (4)

1. Process for preparing a liquid product from worm manure, characterized in that the solid biological conversion product is freed from coarse particles, then it is suspended in water with a small amount of polysaccharide gum as a thickening agent, residual solid impurities therefrom. the suspension is ground to a particle size of at most 500 µm and the ground product to the. makes final suspension with water and a small amount of poly-sabcharidegonü. and optionally adding a bactericide. 2. Process according to claim 1, characterized in that the poly-10 saccharide gum is xanthangonfckdest. 3) Process according to claim 1 or 2, characterized in that the polysaccharide gum is used in a total amount of 0.05-0.5%. 4. Process according to claims 1-3, characterized in that the product also contains a potassium and / or phosphate salt and / or ammonia. 8403274