DD142802A3 - METHOD FOR PRODUCING A NUTRITATED GROUND-IMPROVING ORGANIC SUBSTANCE - Google Patents

Abstract

Process for the preparation of a spreadable, soil improving, nutrient-rich organic substance based on Secondary products of industrial wholesale and Kleihtierhaltung with a content of inorganic gels. The aim of the invention is a Prevention of phosphate fixing, an improvement of the technology the work-up of the abovementioned secondary products and an increase the soil improving effect of the organic substance. The above mentioned secondary products are treated with a flocculant solution, prepared from an alkali metal silicate in the form of sodium and / or Potassium water glasses and sodium aluminate with a SiO2 concentration from 0.1 to 10% and a NaAl (OH) 4 concentration of 0.05 to 5% for SiO 2: Al (OH) 3 molar ratios of 1: 1 to 15: 1, in Application rates of 0.05 to 5%, based on dry matter, in one mixed one-step process, the solid content separated, continue dehydrated and dried. It is possible to prepare the secondary products add to their flocculation open-minded Schaurakunststoffe. When Another area of application is the improvement of culture substrates and composting.

Description

1977 36 -π-

a) ^v method for producing a soil-improving, 'nutrient-rich organic substance

bj Field of the invention

The invention relates to a process for the preparation. a dispersible, soil-improving, nutrient-rich organic substance containing inorganic gels. Another field of application of the composition according to the invention is the improvement of cooling door substrates and composters, as well as the clarification of municipal and industrial wastewater.

g) Characteristic of the known technical solutions

It is known that the strongly water-containing secondary products of industrial large and small animals

, pose in unchanged form or after separation of the liquid portion in thickened form to be used as fertilizers. Since the pH of the above secondary products has a very high proportion of fines with a high degree of peptization, only insufficient separation of the solid from the liquid phase takes place in the physical separation processes for thickening. Therefore flocculants based on linear colloids or aluminum or iron are often used.

^; ... added (III) salts, in order to flocculate and separate off the solids. The solid thickened by the physical separation methods is subsequently

197 736 - * -

subjected to a further dewatering process in which it is dewatered to a dry matter content of 25 to 28 % to an organic manure spreadable by the stable manure technique, or dried in a dry process to a spreadable, flour-like fertilizer. This drying process requires the above due to the high water content Secondary products require a great deal of energy.

For wastewater treatment is known that the solid fraction of municipal and industrial wastewater by addition of soluble silica sols or alkali metal silicates and aluminum compounds such as Al salts or sodium aluminate, flocculated and eliminated in known physical separation processes (US-PS 2241 64 Τ, US-PS 2310,009, US-PS 3928 1.95, DT-OS 2o63 939). These methods have in common that the wastewater and waste sludge are treated in a multi-stage treatment first with the soluble silicates and then with the aluminum salt solutions or first with the - ^ atriumaluminat and subsequently with the alkali metal silicate and additions of alkaline earth salts or ammonium salts, whereby the solids flocculated be and can be separated. A retention of soluble inorganic compounds in the pesticide was also observed. "The immediate contact of the ITatriumaluminats: with the secondary products of large-scale and small animal husbandry, there is a determination of the phosphate content in the form of insoluble, not plant-available aluminum phosphate, so that this This is also the case when the secondary products are flocculated with Al and Fe-CCII salts, whereby insoluble iron (III) phosphate is formed in addition to the aluminum phosphate.

If7 736-3-

Di'e with the thickened secondary products of large and small animal husbandry on the ground discharged substance is degraded very quickly in this microbiological and contributes little and indirectly to an improvement in soil physical properties. ,

It is also known that this sulfite liquor is added to improve the properties of biological fertilizers from Abfall- sludges of municipal wastewater (DL-AP 1 $ 0 854)!. ^v

d) Object of the invention

The aim of the invention is, by the use of a suitable flocculant dew thickening and drying process of the secondary products of industrial large and small animal husbandry while avoiding the ·· '; , , Determining the Phosphataaiteiles technology: to ^comparable: reform. At the same time the soil-penetrating effect of the organic substance is to be increased. : ';_;;;

e) Explanation of the essence of the invention. Y -

-Technical task * ν

The invention is based on the object on the 'basis of inorganic gels a flocculant for coagulating and thickening the secondary products of industrial large and small animals to be _applied: turn,' the constituents a retention of valuable soluble loading, but not their determination in not: .: \

Causes''plant-availableform' to obtain a spreadable, nutrient-rich, soil-improving organic substance zw.:. :. ^j

Features of the Invention.

According to the invention. The object is achieved in that a flocculant solution prepared from an alkali metal silicate in the form of soda and / or potassium waterglasses and sodium aluminate with a SiO 2

Concentration of 0.1 to 10%, preferably 0.1 to 3 %, and a KaAl (OH). Concentration of. 0.05 to 5 %, preferably 0.05 to 2%, for SiO ₂ ; Al (OH) V molar ratios of 1: 1 to 15: 1, mixed with application rates of 0.05 to 5 % based on dry matter in the secondary products of industrial large and small animal husbandry and thereby the solid material is flocculated share, wherein the secondary products open-celled foams based on high polymers and / 'or polycondensates in application rates from 0 to

, 20. % and / or sulfite liquor from the pulp and paper industry in a Aüfwandmenge of 0 to '20 %, each based on dry matter, can be added.

The flocculant composition is adjusted in such a way that a gel does not spontaneously form from the alkali silicate and the sodium aluminate, but both grain components initially react to form a low molecular weight, water-soluble aluminosilicate, which is then mixed into the secondary products in a one-stage process becomes. By Alumosilikatbildung before mixing into the secondary products, a reduction in the definition of the phosphorus ^l phate is expected in not plant-available form. '

The flocculated solids content is then separated by known physical separation techniques, and fed directly to further dehydration or drying. ·

It has been found that by the treatment according to the invention of the secondary products of "industrial large and small animal husbandry an improved separation of the pesticide fraction, in particular the: Peinstoffanteils, is recorded and the Pugat with a lower Peinstoffgehalt for an excitation is better suited than without them Treatment The separated pesticide thereby accumulates with a higher dry matter content, and the drying process, if necessary already by air drying, converts it into a spreadable material which can be applied to the pelders with the help of the fertilizer spreading technique. Since: the pesticide already with higher dry matter content and easier to separate from the Pugat, at;

Drying as a result of the gel fraction a spreadable product even at lower dry matter contents than without the treatment according to the invention; is obtained and may even be dehydrated even by air drying, in addition to the saving of energy or fuels for the drying process, an improvement in the technology of processing the secondary products of industrymäßigen large · * and small animal husbandry achieved and better storage of this organic substance possible. ' ^: '-.'...'Due to the chemical properties and the structure-stabilizing effect of the

.mäßen product aluminosilicate is an improvement of the physical and. physicochemical properties of the soil directly and indirectly expected by the organic substance, so that the inventive composition can also be used as a soil improver, in particular for improving water balance, and sorption.

By the addition of sulfite liquor a Ver /, improvement of the flocculation effect of the pesticides is achieved by the aluminosilicate, which has been found that the ligninsulfonsäuren to a large

  Part to be precipitated. "·

The agent according to the invention can be mixed with fertilizers:. and micronutrients are supplemented so that the soil is optimally fertilized with its application in accordance with the EDV fertilization recommendations. It is also possible to use crop protection agents such as fungicides, herbicides, nematocides and the like. a. in the required

^v . Add volume. As a result, additional operations save the expenditure of these funds.

The for the behavior of the organic matter of: important 'secondary products in the soil property of hydrophilicity is favorably influenced by the content of aluminosilicate gel product of the invention.

The property of alumosilicates to exchange ions may cause over-fertilization. mitigated in the application of Sekundärprodukten'der industrial moderate large and small animal production ± n high application rate on "the fields can occur.

f) '; applications

Example 1: ·

10% of the slurry is mixed with 17.8 g of an aluminosilicate solution of the following composition, with stirring:.

3.6 SiO ₂ 2.14 %

) ^s ₄ '0.66%

Water 97.20 % ' dry matter content of the separated solid:; 31 %

Claims (1)

Claim:. _. 1. A process for the preparation of a soil-improving, nutrient-rich organic substance containing inorganic gels, characterized marked,. 'net,' that a flocculant solution, prepared from an alkali metal silicate in the form of sodium and / or potassium water glasses and sodium aluminate'mit a SiO ₂ concentration of 0.1. to 10 %, preferably. 0.1 to 3 %, and a NaAl (OH)), concentration of 0.05 to 5 %, preferably 0.05 to 2%, at SiO ₂ : Al (OH) .j molar ratios of T. ·. T to 15: · T, with application rates of 0.05 to 5 %, based on dry matter. is mixed in the secondary products of industrial large and small animal husbandry, the solid content flocculated, separated and further dehydrated or dried. ·. , .2. Process for the preparation of a soil-improving, nutrient-rich organic substance.According to item 1, characterized in that the secondary products of the industrial large and small animal husbandry an addition on open-cell foams based on high polymers and / or polycondensates in amounts of from 0 to 20 % and / or sulphite liquor from the pulp and paper. May contain industry in an amount of 0 to 20 %, in each case based on dry matter. Example 2: 100 g slurry 10 ^ ig with an addition of 5% ', based on dry matter, of sulfite liquor v / erden mixed with 17.8 g' an aluminosilicate solution of the following composition with stirring:; ,. Na ₂ O 3.6 SiO ₂ ^ 2.14 % NaAl (OH); ^. 0.33 % .. :; Water . '- ^; 97.53 % Trockenmassegehält. of the severed. , Solid:; 29.5 %