SU1257062A1 - Method of manure processing - Google Patents

Abstract

The invention relates to the disposal of agricultural runoff as fertilizer, and specifically to the processing of manure by centrifugation, and reduces the content of suspended solids in the liquid fraction, which is sent to field sumps. Manure, in particular drains of pig farms, is subjected to separation into solid and liquid fractions by centrifugation. The foam is separated from the liquid fraction, which is mixed with the solid fraction and subjected to biothermal treatment in piles. 1 hp ff. with S (L with tc ate O) 00

Description

This invention relates to the disposal of agricultural runoff as fertilizer, and specifically to

re) processing navrza.

The aim of the invention is to reduce suspended solids in the liquid fraction.

Example. The drains of pig farms with a moisture content of 98.2% are subjected to fractionation by centrifugation. A solid fraction with a moisture content of 67.3% and a liquid fraction with a moisture content of 98.6% with a foam content of 32% by volume are obtained. The foam is separated continuously on an arc sieve with a radius of 300 mm and a perforated surface area of 0.1 m and is directed by gravity into the screw conveyor under the centrifuge. At the same time moisture. Solid fraction

increases to 73.6%. The liquid fraction released from foam is fed to the common collector, from where it is pumped and pumped to field sumps. Suspended solids content in the liquid fraction after foam separation is 7700 mg / l. At the same time, easily settling substances remain in the liquid fraction, since the bulk of difficult-to-set gel-like substances leave with foam.

After mixing with the foam, the solid fraction is subjected to biothermal treatment in piles.

Thus, using the effect of aeration of fugate and the formation of foam inherent in many types of centrifuges.

and the undesirable, froth-of-a-foam department reduces the amount of suspended matter in it. And mixing the foam with the solid fraction, not exceeding the maximum permissible

Editor T. Parfenova

Compiled by E.Voitsehovsk

Tehred M. Khodanych Proofreader E. Roshko

Order 4877/18

Circulation 864. Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5

Production and printing company, Uzhgorod, Projecto st., 4

the moisture content of the solid fraction, vtipsizes the suspensions contained in the foam, and at the same time solves the problem of foam destruction.

In order to carry out the destruction of the foam with minimal cost, it is preferable to separate the foam at the outlet of the centrifuge and direct it into the flow of foam under the centrifuge. Then the particles of the solid fraction, which feed from the centrifuge, will destroy the foam and will not require energy-intensive mechanical defoamers.

The separation of the foam from the centrifuge stream can be carried out by various known methods: arc screens, overflow partitions, mechanical or pneumatic pecogon.

Such devices must be placed at the outlet of the centrifuge from the centrifuge.

The proposed method allows to reduce the content of suspended substances in the liquid fraction by 15%.

Claims (2)

1. Method of processing manure, including its separation into solid and liquid fractions by centrifugation  followed by biothermal treatment of the solid fraction, characterized in that, in order to reduce suspended substances in the liquid fraction, foam is separated from the liquid fraction and mixed with the solid fraction. 2. A method according to claim 1, characterized in that, in order to reduce the cost of mixing, the solid fraction is supplied to the foam stream.