CH672485A5

CH672485A5 - Composting liq. manure with desiccated fibres - by opening fibres in pumps to increase their absorbency

Info

Publication number: CH672485A5
Application number: CH235/87A
Authority: CH
Inventors: Gerard Wisard
Original assignee: Mnd Diffusion F Noeding
Priority date: 1987-01-24
Filing date: 1987-01-24
Publication date: 1989-11-30

Abstract

Desiccated fibres are opened to absorb liquid when they are composted by transferring liq. from a sump to a mixing pit and then to a separator, opening the fibres in chopping, grinding, and recycling pumps, and separating the fibres from liquid in press rollers after the liquid has penetrated to their cores to decrease their carbon to nitrogen ratio and accelerate fermentation. The liq. is pref. manure. ADVANTAGE - The liq. is solidified and ferments well.

Description

       

  
 



   DESCRIPTION



   La présente invention a pour objet un procédé de solidification de liquide par absorption, en l'occurrence du purin, afin d'obtenir une matière compostable. Le principe d'absorption d'un liquide par des substances fibreuses desséchées est largement connu (déchets de coton et de bois).



   De nombreuses expériences concernant le mélange de purin et de sciure pour obtenir un compost se sont presque toujours soldées par un échec, le rapport carbone sur azote étant toujours trop élevé. Le procédé décrit ci-après démontre comment, en ouvrant la fibre des matières pour absorber le liquide, on augmente le pouvoir de rétention et, de ce fait, accélère le phénomène de fermentation dû à l'abaissement du rapport carbone sur azote.



   L'invention de ce procédé permet donc une meilleure solidification du liquide qui est le but recherché dans l'élimination des purins excédentaires.

 

   Le dessin annexé représente schématiquement, à titre d'exemple, une forme d'exécution du procédé. Le purin est préalablement brassé, broyé et recyclé dans la fosse existante 1, cela pour obtenir un liquide homogène. Par pompage 2, le liquide est transféré dans une fosse de mélange 3 où, après adjonction de matières sèches fibreuses 4 (sciures, écorces et copeaux de bois, pailles, émondes, etc.), le liquide et les matières sèches subissent un traitement comprenant: brassage, déchiquetage des fibres, homogénéisation complète du mélange.



   Une fois la consistance désirée établie, le mélange est pompé dans un séparateur à tambour 5, où les matières solides 6 sont séparées du filtrat 7 qui, lui, retourne dans la fosse existante pour recommencer un cycle. 



  
 



   DESCRIPTION



   The subject of the present invention is a process for solidifying liquid by absorption, in this case liquid manure, in order to obtain a compostable material. The principle of absorption of a liquid by desiccated fibrous substances is widely known (cotton and wood waste).



   Many experiments with mixing manure and sawdust to make compost have almost always failed, as the carbon to nitrogen ratio is still too high. The process described below demonstrates how, by opening the fiber of the materials to absorb the liquid, the retention capacity is increased and, therefore, accelerates the fermentation phenomenon due to the lowering of the carbon to nitrogen ratio.



   The invention of this process therefore allows a better solidification of the liquid which is the aim sought in the elimination of excess slurries.

 

   The accompanying drawing shows schematically, by way of example, an embodiment of the process. The liquid manure is previously brewed, ground and recycled in the existing pit 1, this in order to obtain a homogeneous liquid. By pumping 2, the liquid is transferred to a mixing tank 3 where, after adding fibrous dry matter 4 (sawdust, bark and wood shavings, straws, prunings, etc.), the liquid and the dry matter undergo a treatment comprising : stirring, shredding of fibers, complete homogenization of the mixture.



   Once the desired consistency has been established, the mixture is pumped into a drum separator 5, where the solids 6 are separated from the filtrate 7 which, in turn, returns to the existing pit to start a cycle again.

Claims

CLAIMS 1. Method for opening the fibers of compostable materials to absorb the liquid, increase the retention capacity and accelerate the phenomenon of fermentation of these materials, characterized in that, during the transfer of the liquid from an existing pit to a pit mixture and from this to a separator, under the action of chopping, grinding and recycling pumps, the fibers of the desiccated compostable materials open up to allow the liquid to access the very core of this fiber, to remain there largely during separation by pressure rollers and, by reducing the carbon to nitrogen ratio, speed up the fermentation process.

2. Method according to claim 1, characterized in that the liquid is liquid manure.

3. Method according to claims 1 and 2, characterized in that the pumps perform, at the same time, pumping, chopping, grinding and recycling by combined pumps.

4. Method according to claims 1, 2 and 3, characterized in that the chopping, grinding and recycling are carried out in a single pit.