Method for preparation of a protein supplement for animal feed

Abstract

Method for improving drying of a concentrated acid salmon silage, during preparation of a protein supplement for animal feed, from salmon silage, wherein in a continuous and sequential form includes treating the stored salmon silage through steps of cooking, separation, concentration, drying, grinding, addition of antioxidant, and packing, wherein after the concentration step, the following steps proceed: a) incorporating in a first mixer an amount of concentrated acid salmon silage, and an amount of flour-type carrier, obtaining an homogeneous mixture; b) incorporating in a second mixer an additional amount of concentrated acid salmon silage, an amount from the first mixer, and a fraction of the load coming out of the dryer, the latter as a recycle; c) transferring the mixture formed in the second mixer to a dryer; d) recycling a fraction of the load, equivalent to the amount that can be from 30% to 60% of the output of the second mixer, fraction defined in function of the humidity at the exit of the dryer; e) passing the mixture of the dry product at the exit of the dryer to a cooler, wherein the cooling is performed from 80° C. to 25° C. for 10 to 30 minutes; f) feeding the dry and cooled down product to the steps of grinding, adding an antioxidant, and packing of the protein supplement for animal feed. Also disclosed are the protein supplement and system to improve drying said protein feed.

Claims

1. A method for preparation of a protein supplement for animal feed comprising: a) incorporating in a first mixer a first amount of concentrated acid salmon silage and a first amount of flour in a ratio of salmon to flour selected from the group consisting of 90:10, 80:20, 70:30 and 60:40 thereby obtaining a first homogeneous mixture; b) incorporating in a second mixer a second amount of concentrated acid salmon silage and a second amount of flour in a ratio of salmon to flour selected from the group consisting of 90:10, 80:20, 70:30 and 60:40, and mixing with the first homogeneous mixture obtained from the first mixer in step a) to obtain a second homogeneous mixture; c) transferring the second homogeneous mixture formed in the second mixer to a dryer for a drying process to obtain a dried product; d) recycling a portion of the dried product obtained from step c), the portion being 30% to 60% of the dried product obtained from step c), and incorporating to the second mixer in step b); e) passing the dried product excluding the portion of the dried product from step d), wherein the portion is 30% to 60% of the dried product, to a cooler for a cooling process, wherein the cooling is performed from 80° C. to 25° C. for 10 to 30 minutes to obtain a dry and cooled down product; f) feeding the dry and cooled down product to a grinder for a grinding process and adding an antioxidant to obtain a protein supplement, and packing of the protein supplement for animal feed.

2. The method according to claim 1, wherein the flour can be wheat bran, wheat flour, rice flour, or corn flour.

3. The method according to claim 2, wherein the flour is wheat bran.

4. The method according to claim 1, wherein the flour is added through a dosing hopper, allowing a constant flow feeding from 70 to 300 kg/h.

5. The method according to claim 1, wherein the drying process is carried out in a rotadisk or drum dryers.

6. The method according to claim 1, wherein the cooling comprises passing a cold air stream in crosscurrent with the dry product coming out of the dryer.

7. The method according to claim 1, wherein an antioxidant ethoxyquine is added in an amount between 100 and 300 ppm.

8. The method according to claim 1, wherein the packing comprises to fill bags with capacities of 25 kg to 1,200 kg.

Description

DESCRIPTION OF THE FIGURE

(1) FIG. 1 describes steps and/or stages related to the system for reducing salmon silage, to obtain a protein supplement and 2 other subproducts: defatted and concentrated salmon silage, semi-liquid and salmon oil.

(2) The diagram of reducing the salmon silage in FIG. 1 describes continuously and sequentially the generic steps of storage 1, loading tank (2), cooking (3), solid-liquid separation in tricanter (4), liquid-liquid separation (5), concentration in evaporation plant (6), and then continuing with drying steps (9), cooling (10), grinding (11), antioxidant dosing (12), and packing (13) of the final product represented by a protein supplement for animal feed. Also, FIG. 1 shows the following numbers corresponding to:

(3) (7) and (8) mixer 1 and mixer 2 respectively.

(4) (14) represents addition of antioxidant.

(5) (15) represents storage of the mixture obtained after evaporation step and before mixing step with mixers 1 and 2.

(6) (16) represents the hopper used to dose the flour-type carrier.

(7) (17) represents storage of flour-type carrier (for example wheat bran, wheat flour, rice flour, corn flour).

(8) (18) represents sludge obtained during the liquid-liquid separation process.

(9) (19) represent sediments (discards).

EXAMPLE

(10) An example of application of the invention is described below, where the method for which protection is sought is used, without representing a limitation to the invention.

(11) In a storage tank containing 600 tons of salmon silage, 12 tons of said silage are passed through a loading tank, maintaining constant agitation to ensure homogenization.

(12) A certain amount of salmon silage is taken, for example a flow of 10 ton/h, and taker to a continuous cooker operating at a temperature of 95° C. leaving to react for 5 minutes, wherein an oily phase and an aqueous phase, containing the hydrolyzed product, are formed, and the non-hydrolyzed solid discards represent insoluble matter.

(13) The treated mixture is passed to a tricanter, wherein a solid-liquid phase separation is performed, eliminating solids or insoluble matter present. Afterwards, the supernatant is introduced into a centrifuge wherein a liquid-liquid separation is performed, separating an oily and an aqueous phase; wherein the oily phase contains salmon oil, which is taken to a storage tank for future use.

(14) Meanwhile, the aqueous phase, containing the hydrolyzed product, is introduced in an evaporator or evaporator plant, wherein water is eliminated and a wet paste of concentrated hydrolyzed product is left, representing an acid salmon silage, that has been defatted and concentrated with a percentage of water-humidity between 45% and 53%.

(15) The concentrated acid salmon silage is introduced into a first mixer together with an amount of what bran; in a ratio of 80% and 20%, and is further incorporated in a second mixer together with a fraction of the load coming out of the dryer, the latter as a recycle, in a ratio of 80% and 20%, defined by the humidity at the exit of the dryer.

(16) Afterwards, the mixture that has been formed in the second mixer is transported to a rotary dryer operating at a temperature between 80° C. and 95° C. during a period of 45 minutes, and a fraction of the load coming out of the dryer is recycled to the second mixer, and the mixture of dry product at the exit of the dryer is passed through a cooler, wherein the cooling of the mixture of dry product takes place at a temperature from 80° C. to 25° C. during 25 minutes.

(17) The dry and cooled down product is fed to the grinding step wherein the product is granulated, obtaining 95% of the product with a size smaller than 5 mm, adding 200 ppm of ethoxyquine as antioxidant, and finally the protein supplement for animal feed is packed in polypropylene bags with a capacity for 50 kg.

(18) The product before packing presents a physical form of a brown, coarse flour, with a characteristic odor.

(19) The packed product in the corresponding bags that can go from 25 kg to 1,000 kg or more, are stored during a shelf life period of 18 months, in a fresh place with a relative humidity lower than 60%.

(20) A representative sample of the product stored in a bag was taken, to which a physico-chemical analysis was performed, showing an nutritional evaluation of 50% protein, 7% fat, 10% humidity, 10% total ash, and 5% raw fiber.