FI77641C - FOERFARANDE FOER INMATNING AV MASSA I KOMPOSTORN OCH EN KOMPOSTOR. - Google Patents

Description

77641

Method for feeding pulp to a composter and a composter

The invention relates to a method for feeding pulp to a continuous composter into which peat, manure, straw, grass or other pulp intended for aerobic digestion is fed intermittently and in pulses, leaving the composter typically after a few days of treatment and transferred to storage and / or post-combustion. The invention also relates to a composter using the method.

The composter is typically used to treat manure, firstly making it almost odorless and avoiding fly nuisance. The treatment kills weeds and pathogen bacteria. In addition, the composted manure stores the nutrients and 15 gives them to the plants in good form. Typical applications of the composter in addition to livestock manure maturation are the treatment of residential, greenhouse, garden and fur garden waste.

Manure or other waste treated with a composter is usually in the form of 20 sludges. In this case, its water content (85 ... 95%) is too high to be fed directly to the composter and a humus-containing mass such as peat is mixed into it. The dry matter content of the mass to be fed must be approx.

25 ... 35%: a. In particular, the mixing of peat with the sludge is difficult because, due to the high surface tension, the peat does not naturally absorb the sludge but remains floating on the surface of the sludge. When moving with a feed screw or other known conveyors, these may not be mixed.

The continuous composter is severely disturbed if even a relatively small amount of sludge is fed in. In practice, the wastes to be treated can vary greatly in water content, so the supply of pulp causes a constant problem. Due to the inhomogeneity of the pulp, it is difficult to reliably measure the water content, so it is difficult to apply 35 automatic control drops here.

It is an object of the present invention to provide a novel method and apparatus for feeding pulp which eliminates the risk of excessively aqueous pulp being fed into the composter chamber.

2 77641

The characteristic features of the method according to the invention are set out in claim 1 and the features of the preferred device implementing the method in claim 3.

It is particularly advantageous if there is a further 5 delays in the feed of the pulp, in which case the water in the slurry tends to be better absorbed into the peat or other humus pulp. In practice, the piston press has been found to be the most advantageous transfer device, as it also gives the feed a strong mixing effect. The slurry always bursts through the drier mass during the impact phase, but the excess water can always drain back during the return movement. In addition, the pressure exerted by the piston press further enhances the absorption.

In the following, the invention will be illustrated with reference to the accompanying figures, which show an embodiment of the invention.

Figure 1 shows a side view of the composter. Figure 2 shows a front view of the composter

Figure 3 shows the pulp feed apparatus in detail 20

The figures typically show a composter 1 used for livestock manure maturation. The manure is lowered into a feed trough 6, from where it is transferred via a channel 4 to a composter chamber 8, consisting mainly of a rotating drum, where the manure changes to a better shape and removed with a screw conveyor. 3. The equipment described in Finnish patent publication 75335 can be used for pulp removal.

The supply of manure and humus mass to the silo 6 can take place quite unevenly. The silo 6 comprises a coulter chain 11 and shredder rollers 12 for dispersing and lowering the pulp into the feed opening 10 of the piston press used as the transfer device 7. The effective stroke of the piston press starts after the feed opening 10 and the feed unit is indicated by reference numeral 5 several times larger than one feed unit 5. The channel 4 comprises a vertical portion 9 from which excess water of the pulp drains down. The excessively aqueous slurry bursts back and forth at the beginning of the channel 4 until a sufficiently drier 40 mass is mixed into the mass. The drier mass with a ka content of 25 ... 35% remains on the vertical section of the 77641 3 and the impact from the impact eventually rises to the tray of the feed screw 2 of the conveyor cant 8. The feed screw 2 disperses the lumps formed in the channel 4 by the word as it moves them inside the composter chamber 8.

5 In practice, it has been found that a pipe with a diameter of 35 en adheres to a nose of about 30%. The two-net-high channel 4 gives a delay time of about 24 hours in connection with a 10 n3 composer. The material of the pipe was stainless steel. If the diameter of the pipe is increased, it is advantageous to weld a longitudinal rib in the inner surface in such a way that the relative frictional means remain large enough to hold the entire cross-section in place.

Claims (6)

A method for feeding pulp to a continuous composter (1), to which peat, manure, straw, grass or other pulp intended for aerobic digestion is fed intermittently and in pulses, leaving the composter (1) typically after a few days of treatment and transferred to storage. and / or post-combustion pile, characterized in that the feed takes place at least part of the way upwards through a channel (4) in which a sufficiently dry mass is trapped by the friction as the sludge flows backwards, and that one feed unit (5) has less than a quarter of the entire feed channel by volume. A method according to claim 1, characterized in that the feed rate of the pulp is adjusted so that the pulp travels upwards for more than 10 hours. A composter (1) for carrying out the method according to claim 1, comprising a pulp feed silo (6), a transfer device (7) and a feed channel (4), wherein the transfer device (7) is arranged to periodically press the pulp through the feed channel (4) to the composter chamber (8), characterized in that the feed channel (4) comprises an inclined or vertical part (9) with a diameter of 0.2 to 0.5 m and a height of more than 0.5 m, and that the transfer device (4) 7) the volume of one supply unit (5) is dimensioned to be less than 25% of the volume of the supply channel (4). Composter (1) according to Claim 3, characterized in that the transfer device (7) is a piston press, the feed opening (10) of which is arranged below the feed silo (6). 4,77641 Composter (1) according to Claim 4, characterized in that the feed channel (4) has a diameter of 0.3 to 0.4 m and comprises a vertical part (9) with a height of more than 1.5 m. : s. A composter (1) according to claim 3, 4 or 5, comprising a feed screw which transfers the pulp to the composter chamber (8), characterized in that the upper end of the feed channel (4) is arranged to drop the pulp onto the transfer screw.