# US 4,391,623 A · Method for making of solid fertilizer by separation of liquid manure and device for carrying out this method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,391,623 A
- Document ID: US4391623A
- Status: Granted
- Kind: A
- Application number: 06/257,403
- Filed: 1981-04-24
- Granted: 1983-07-05
- Earliest claimed: 1980-11-22
- Assignees: Heinrich Bernhard Brinkmann
- Inventors: Hermann Knepper
- Web page: https://patentgrep.com/patent/US4391623A

## CPC

- C05F 3/06: Apparatus for the manufacture
- Y02A 40/20: Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
- Y02P 20/145: the feedstock being materials of biological origin
- C05F: ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Method for making of solid fertilizer by separation of liquid manure into a solid and a liquid phase by means of a separating vessel, wherein the charged liquid manure at first is divided into a solid layer and into a liquid phase and from where the liquid phase is fed into a collector vessel, and whereby the solid phase is separated. The duration time of the liquid manure in its resting stage is delayed until the layer formed by the solid phase is separated on the top of the vessel and then the discharge of the liquid phase is carried out through closeable openings.

## Claims

### Claim 1

In a method of making a solid fertilizer by separation of liquid manure into a solid phase and a liquid phase by means of a filter vessel into which the liquid manure is charged, said filter vessel having a bottom and a top and at least one closeable discharge opening, the improvement comprising the steps of immersing the bottom of the filter vessel into a liquid; then introducing the liquid manure into the filter vessel and leaving the liquid manure in said vessel in a resting stage until a solid phase of the manure is collected on the top of the filter vessel and the liquid phase is collected therebelow; discharging the liquid phase from the vessel to such an extent that the solid phase almost reaches the bottom of the filter vessel; interrupting said discharging step and waiting for a renewed separation of the solid phase from the liquid phase and for collecting the solid phase on the top of the vessel and the liquid phase therebelow; and discharging a liquid phase of the manure newly collected in the filter vessel.

### Claim 2 (depends on 1)

The method in accordance with claim 1, the bottom of the vessel having an upper edge, said liquid being water which is fed into the filter vessel before introducing the liquid manure to at least the upper edge of said bottom.

### Claim 3 (depends on 2)

The method in accordance with claim 2, wherein water is fed from below through the bottom of the filter vessel.

### Claim 4 (depends on 3)

The method in accordance with claim 3, wherein said step of discharging a liquid phase of the manure is repeated until no mentionable separation of the liquid phase from the solid phase occurs in said vessel.

### Claim 5 (depends on 3)

The method in accordance with claim 3, wherein after a separation process is completed and the liquid phase is totally discharged from the vessel said discharge opening is opened and a solid phase remaining in the vessel is aired by natural convection provided through the bottom of the filter vessel.