CA2667401A1 - A process to prepare a powder from marine by-products and an apparatus for performing said process - Google Patents

Abstract

The present invention relates to a new process for the production of a powder from marine material, such as shrimp, and to an apparatus for performing said process. The present invention relates also to said powder, such as shrimp powder, and to various uses of this powder.

Description

A process to prepare a powder from marine by-products and an apparatus for performing said process.

FIELD OF THE INVENTION
The present invention relates to a new process for the production of a powder from marine material, such as shrimp, and to an installation suitable for carrying out said process. The present invention also relates to said powder, such as shrimp powder, and to various uses of this powder.
BACKGROUND OF THE INVENTION

Norwegian shrimp are caught along the whole of the Norwegian coast from the Oslo Fjord in the south to the Barents Sea in the north. They are also caught close to Jan Mayen, around Spitsbergen and right up to the drift ice at 80 degrees north.
The shrimp are caught with trawls by a modern and efficient fishing fleet, before delivery of the fresh shrimp to receiving facilities on the mainland.

The shrimp are further processed to obtain peeled shrimp, the peeling process today for the most part being done by machines. The by-products of this process are large amounts of shrimp shell and process water which have previously been respectively dumped and separated into the sea. In addition to the by-products representing large amounts of non-used resources, such as nutrients, flavouring agents, colouring agents and the like, they are also a burden on the enviroiunent. Consequently, there is a great need for a process capable of recovering the resources that are contained in said by-products.

It is known to use flotation technology to treat sewage, and it also known to use the same technology to make use of the substances from process water that are otherwise flushed out during the shrimp peeling process. Whilst the use of flotation technology in treating sewage results in sewage sludge as waste product, the use of the same technology in the treatment of process water from shrimp peeling results in a sludge product that contains a number of attractive compounds. However, said sludge product has poor storage life and is thus of little usefulness without fitrther processing. To obtain a product with good storage life, said sludge may be dried. However, the drying of this product has been found to be very difficult.

The present inventors have therefore further developed the aforementioned process applied to process water from shrimp peeling by mixing the sludge product with slZrimp shell which may advantageously be pretreated to remove as much water as possible.
This mixture was then subjected to a drying process that is both rapid and gentle.
Surprisingly, a dried powder was obtained, unlike what is the case w11en the sludge product is subjected to said drying process in the absence of said shrimp shell. Said io dried powder is a useful powder with good storage life.

US4282256 relates to a method for the preparation of a powder from marine material that can be used as an additive in animal feed. Said powder is prepared from process water derived from the processing of fish. After a series of process steps according to is said method, a "sludge product" is formed. This "sludge product" is then dewatered using a centrifuge before it is blended with an absorptive edible carrier. It is mentioned that the carrier may be a nutritive fibrous absorptive solid such as finely ground alfalfa, ground corn cobs, potato peel, cereal products and nuts. The carrier is added to reduce the amount of moisture that is taken up in the end product, as the end product is highly 2o hygroscopic.

Unlike the subject matter described in US4282256, the "sludge product"
according to the present invention does not have an anti-hygroscopic agent added thereto, but has shell derived from marine material added to it. Said shell does not have absorptive 25 properties, as described for the carrier referred to in US4282256, but is added to the "sludge product" to facilitate drying so that an end product is obtained that has a water content lower than 15 wt %, preferably lower than 10 wt %.

JP01208385 relates to a method for producing particulate fertilizer from marine waste.
30 In this process, the process water is subjected to flotation, after which the sludge product from this process is blended with (adsorbed on) powdered bone material and fowl droppings. This product is then subjected to a blending/grinding process to obtain a granulate, after which this granulate is heated to a temperature of 60-80 C
and subsequently fermented for a period of about 5-10 days. The fermented product is then 35 dried to obtain a particulate fertilizer having a water content of < 30 wt %.

Unlike the present invention, the process according to JP01208385 is a process for the production of a particulate fertilizer. Furthermore, fowl droppings are included as an essential element in the process described in JP01208385, which is not the case in the process according to the present invention. In addition, JP01208385 describes the use of a powdered bone material, whereas the process according to the present invention employs shell from marine material. As bone material (high amounts of calcium phosphate) has a chemical composition that is significantly different from shell material (high amounts of calcium carbonates), said two terms must be regarded as describing different chemical compositions. Furthermore, the mixture in JP01208385 is fermented io for 5-10 days prior to drying, which is not the case for the mixture according to the present invention. The process described in JP01208385 results in an end product where the water content is reduced to < 30 wt %, whereas the process according to the present invention results in an end product where the water content is reduced to less than 15 wt %, preferably less than 10 wt %.

Consequently, the present invention provides a unique process which for the first time makes it possible to make use of the whole of the raw product, i.e., the peeled shriinp that is put in brine, shell from the shrimp and dissolved substances in the process water, which altogether in fact constitute more than 50% of the weight of the shrimp.
The end product is a powder which will be an attractive ingredient in a number of products.
Moreover, the ingredients market is in a period of strong growth, and marine ingredients in particular are in great demand, especially marine ingredients that are produced naturally, as is the case in the present invention.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to a new process for the production of a powder from marine material such as shrimp, and an apparatus for performing said process.
The present invention also relates to said powder, such as shrimp powder and to various uses of this powder.

DESCRIPTION OF THE FIGURES

Figure 1. Apparatus suitable for performing the process according to the invention.
1) Sieve for separating shell from process water 2) Surge tank with pumping station 3) Supply of dispersed water and optionally a polymer, where the polymer may be chitosan.
4) "Musling" (see Figure 2) 5) Sludge pocket io 6) Sludge store 7) A device may advantageously be installed for pressing more water out of the sludge 8) Mixing chamber suitable for mixing product A and product B
9) Transport screw 10) Transport screw 11) Screw press, where water can be pressed out of the shell 12) Discharge box 13) Water from discharge box is passed to the dispersion unit (see Figure 3) and to the make-up water pumps for polymer, if polymer is used.
14) Infeed screw to the combined drying and grinding unit.
15) Turbo rotor for simultaneous drying and grinding.
16) Heat generator 17) High-performance filter 18) Dispersion unit (see Figure 3) 19) Packing device 20) Flocculation device that meters the polyiner mentioned under point 3.
Figure 2. The "MUSLING" flotation unit suitable for chemical separation Zone 1 (Inlet zone) The process water is led by its own fall to a puinping station where the process water is pumped into the bottom of the "Musling", where dispersed water and optionally a polymer, as for example chitosan, are added just before the inlet.
Zone 2 (Distribution zone) Process water, dispersion water and optionally a polymer (for example, chitosan), are mixed together well immediately after the inlet. Here, the air bubbles will rise rapidly to the surface and carry with them the finished flakes. This is a relatively calm zone with low water velocity. Any heavy particles will settle.
5 Zone 3 (Aggregation) Any heavy particles will settle.
Zone 4 (Acceleration zone) The waste water is passed upwards where the surface is reduced between an outer wall and an inner cone. The velocity of the water and particles is increased substantially.
io Zone 5 (Separation zone) The water stream enters the separation zone at the point where the surface area is maximised, and the velocity is rapidly reduced. Particles etc. are given a vertical velocity towards the surface and will separate from the liquid phase. Flotated sludge is scraped off the surface and into a sludge pocket. The treated water turns gently 180 down into the inner cone.
Zone 6 (The outlet zone) The water is passed from the inner cone out into the discharge box. Here the treated water can be checked visually. From the discharge box, water is taken to the dispersion plant and to the make-up water pumps for polymer, if polymer is used. Treated water is then led by its own fall to a recipient.

Figure 3. Dispersion unit suitable for use in the present invention The dispersion unit uses treated waste water to produce dispersed water.
Dispersed water is added to the process water at the inlet to the "Musling". Dispersed water is air-saturated water formed by atomising the water over an air bed inside a pressure tank.
Atomisation of water is effected by pumping the water through a nozzle at the top of the tanlc. At the point where the dispersed water is added to the process water, quantities of microscopic air bubbles are released which become the driving force in the subsequent separation step.
Figure 4. Combined drying and grinding plant, suitable for use in the present invention 1) Heat generator 2) Infeed screw 3) Turbo rotor 4) High-performance filter 5) Valve 6) Higli-performance blower DETAILED DESCRIPTION OF THE INVENTION

In a first aspect of the present invention, a process is provided for the production of a powder from marine material, characterised in that the process comprises the following steps:
io a) Mixing product A with product B, where product A comprises shell from marine material, and product B comprises substances recovered from process water derived from the processing of the marine material;
b) The mixture of products A and B is dried and optionally ground to obtain a powder.
Said drying process can be carried out on said mixture before the mixture is optionally ground, or the mixture may first be ground and then dried, but most preferably the mixture is dried and ground simultaneously. Consequently, the mixture of A and B, for example, could be dried and ground in process steps 14-17, as shown in Figure 1.

2o The product obtained by the process according to the first aspect of the invention has preferably a water content that is lower than 15% (weight), more preferably lower than 10% (weight), as for example lower than 9% (weight), lower than 7% (weight), lower than 5% (weight) or lower than 2% (weight).

Suitable devices for drying the mixture, comprising product A and product B
according to the present invention, are well described in the literature. Examples of suitable devices for drying and grinding can be found in DE19834896, or in DE29515433.

The aforementioned process of mixing products A and B may, for exainple, be performed in a mixing chamber as shown in Figure 1, point 8. Here, it should be understood that also other suitable mixing devices or methods may be used.

In one embodiment of the present invention, product A is prepared according to a process that comprises the following step:
a) Shell from marine material is separated from the process water that comes from the processing of the marine material. Said separation may, for example, be carried out using a sieve, as shown in Figure 1, point 1. Said sieve may, for example, be a mechanical sieve, such as a screw press. Said sieve may optionally be a filter.
However, it should be understood that also other suitable separation methods or devices may be used.

to Advantageously, the aforementioned process for preparing product A further comprises a process step where as much water as possible is pressed out of said shell from marine material, for example, by using a sieve, such as a mechanical sieve which advantageously may be a screw press as shown in Figure 1, point 11. Here, it should be understood that also other suitable devices or methods for removing water can be used.
Consequently, product A is, for example, prepared by process steps 1, 9, 10 and 11, as shown in Figure 1.

One example of the nutritional composition of product A from shrimp in dried and ground form is shown in Tables la to ld and in Table 2. Product A from shrimp is however not limited to this composition, as it may vary depending on the composition of the raw material. Variation in the composition of the raw material can be seen clearly by comparing Table 1' and Table 2.

In another embodiment of the present invention, product B is prepared according to a process that comprises the following step:
a) Separating sludge product from process water that comes from the processing of the marine material. For removal of as much shell as possible from the process water, before sludge product is separated therefrom, said process water can advantageously be treated using a sieve, or other suitable device or method, for example, a filter.
Said sieve may, for example, be a mechanical sieve. Said separation of sludge product from process water can advantageously be carried out using flotation technology. A possible separation using flotation technology can be carried out using the "Musling", as shown in Figure 1, point 4, and shown in more detail in Figure 2. Flotation is a process that is well described in the literature, see, for example, US4492635. The use of flotation technology in combination with a dispersion unit and optional flocculator is described in some detail in Swedish Patent No. SE0500649. When using a flocculator, the polymer can advantageously be chitosan.

Advantageously, as much water as possible can be removed from said sludge product, io for example, by using a sieve or filter, where said sieve may be a mechanical sieve.
Consequently, product B can, for example, be prepared by process steps 1-7 as shown in Figure 1.

is In a fi.uther embodiment, said processing of the marine material is the production of peeled or cleaned marine material. Preferably, said marine material is shrimp or other shellfish, as for example crab or shells, where shrimp is most preferable.
Said shrimp may, for example, be Pandalus borealis or Pandalus jordani. Consequently, the processing of the marine material may be the peeling of shrimp, where said shrimp may 2o be Pandalus borealis or Pandalusjordani. Optionally, the processing of the marine material may be the cleaning of other shellfish such as crab or shells, where the shells may, for example, be mussels.

In one embodiment of the present invention, product A thus comprises shrimp shell, 25 which, for example, may be shell from Pandalus borealis or Pandalus jordani, and product B comprises substances recovered from process water derived from the production of peeled shrimp, where said shrimp may be, for example, Pandalus borealis or Pandalus jordani.

30 In another embodiment of the present invention, product A further comprises shell from other shellfish than shrimp, as, for example, shells such as mussels, or crab, and product B comprises substances recovered from process water derived from the production of cleaned shellfish other than shrimp, as, for example, shells such as mussels, or crab.

The process according to the present invention can advantageously be connected directly to the process of processing the marine material, thereby ensuring that product A and product B are as fresh as possible. In that case, the powder according to the present invention will be produced continuously, without temporary storage of raw materials. Such a powder will have superior quality compared with powder produced from raw products that have been stored over time.
In a second aspect of the present invention, there is provided a powder characterised in that it is obtained by the process of the present invention. The process of the present invention gives a powder of high protein content, wllerein the content of the powder is derived only from:
= process water that comes from the processing of the marine material; and = shell that comes from said marine material.

Preferably, said powder can be obtained by the process according to the present invention, wherein product A and product B are mixed in a mixing ratio as, for 2o example, shown in Table 4. Even more preferably, the mixed product is SSP10, SSP20, SP30, SP40, SP50, SP60, SP70, SP80 or SP90, as shown in Table 4. More preferably, the mixed product is SP40, SP50, SP60 or SP70, as shown in Table 4. Even more preferably, the mixed product is SP50 or SP60, as shown in Table 4. Most preferably, the mixed product is SP50, as shown in Table 4.
As the composition of the raw material may vary, the content of product A and product B will vary correspondingly. By mixing different amounts of product A and product B, the process according to the present invention malces it possible to provide an end product with a desired composition independent of the coinposition of the raw material.
A third aspect of the present invention relates to the use of the powder according to the present invention in foods, animal feed, food supplements, cosmetics or pharmaceutical products. It is also obvious that said powder can also be used as a taste additive, as a natural colouring agent etc. Said powder also contains antioxidants which further give the product a number of potential uses.

5 Yet another aspect of the present invention relates to an installation that is characterised in that it is suitable for the performance of the process according to the present invention. Advantageously, the installation contains the following components:

= A device suitable for the separation of sludge product from process water, which, for example, may involve the use of flotation technology, and which, for example, 10 may be the "Musling" as shown in Figure 1, point 4, and in Figure 2 with associated dispersion unit, as shown in Figure 1, point 18, and optionally with a flocculator, as, for example that shown in Figure 1, point 20.
= A device suitable for drying and grinding the mixture comprising product A
and product B, which, for example, may be the drying device shown in Figure 1, points is 14-17 Advantageously, the installation further comprises a device for separating shell from process water, such as a sieve or a filter, where said sieve may be a mechanical sieve such as a screw press.

Preferably, the installation may further contain a device suitable for inixing product A
and product B, which, for example, may be a mixing chamber as shown in Figure 1, point 8.

Preferably, the installation may further contain a device for pressing water out of product A, which, for example, may be a sieve or a filter, where said sieve may be a mechanical sieve, as for instance a screw press, as shown in Figure 1, point 11, and optionally also a device for pressing water out of product B, which, for example, may be a sieve or a filter, where said sieve may be a mechanical sieve, such as that shown in 3o Figure 1, point 7.

The installation may also contain a device for collecting product B, which, for example, may be a collection tanlc, as shown in Figure 1, point 6.

Preferably, the installation comprises the components that are shown in Figure 1.
EXAMPLES
The following examples are intended to illustrate how the present invention may be made or used, and are in no way meant to be limiting for the scope of the invention.

Example 1 Process for preparing Product A
a) By-products from the production of peeled shriinp are led towards a sieve, as shown in Figure 1, point 1.
b) Shell that does not pass through the sieve, will be passed on towards two subsequent transport screws, as shown in Figure 1, points 9-10, and further transported to a screw press, as shown in Figure 1, point 11, where water is pressed out.

Example 2 Process for preparing Product B
a) By-products from the production of peeled shrimp are led towards a sieve, as shown in Figure 1, point 1.
b) The material that passes through the sieve is then passed towards a pumping station, as shown in Figure 1, point 2.
c) The material is further pumped towards the bottom of the "Musling", as shown in Figure 1, point 4, where dispersed water and optionally a polymer, as, for instance, chitosan, are added immediately before the inlet, as shown in Figure 1, point 3.
d) Sludge product is formed at the top of the"Musling", and is scraped over into a sludge pocket, as shown in Figure 1, point 5.
3o e) The sludge is further passed towards containers for storage of said sludge, as shown in Figure 1, point 6.

Example 3 Process for mixing A and B, and for drying and grinding said mixture.
a) Product A from Example 1 and Product B from Example 2 are passed to a common mixing chainber, as shown in Figure 1, point 8.
b) The mixture of A and B is then passed via a transport screw to the infeed screw, as shown in Figure 1, point 14, to the combined drying and grinding unit.
c) The mixture is then passed towards a turbo rotor, as shown in Figure 1, point 15, for simultaneous drying and grinding. To obtain a drying process, a heat generator, as shown in Figure 1, point 16, is comiected to said turbo rotor.
io d) After the mixture has been dried and ground, it is passed towards a hig11-performance filter, where particles are separated from the air, as shown in Figure 1, point 17.
e) The dried and ground product may then be passed towards a device suitable for packing said product, as shown in Figure 1, point 19.
Example 4 Process for determining the composition of product A.
a) Product A from Example 1 is passed via a transport screw to the infeed screw, as shown in Figure 1, point 14, to the combined drying and grinding unit.
2o b) The product is further passed towards a turbo rotor, as shown in Figure 1, point 15, for simultaneous drying and grinding. To obtain a drying process, a heat generator, as shown in Figure 1, point 16, is comlected to said turbo rotor unit.
c) After the product has been dried and ground, it is passed towards a high-performance filter, where particles are separated from the air, as shown in Figure 1, point 17.
d) The dried product was analysed for certain ingredients. The results are shown in Tables la-ld and in Table 2.

Table 1:

Shrimp shell is sieveed from the by-products of the production of peeled shrimp. The shrimp shell is then passed into a screw press for removal of water, and is then subjected to a combined drying and grinding process. The resulting dried and ground shrimp shell is then analysed for:
Table 1 a: crude protein, water, ash, fat (soxhlet) and astaxanthin esters Table lb: colony count Table lc: P, K, Ca, Mg, Na, S, Fe, Cu, Mn, Zn, Mb, B, Al, Ar and Hg Table 1d: Amount of each individual amino acid in relation to a given amount of protein The material was received for analysis on 5 March 2003 was analysed in the period 5 March 2003 to 11 March 2003.

Table la Results of analysis Sample No. SSF 2003-00592-01 Client's marlcing 27/2-03 Crude protein comb. method % 43.7 Water % 4.3 Ash % 35.3 Fat (soxhlet) % 0.4 Astaxanthin esters mg/kg 50 Method: %CV: Method reference: Method: %CV: Method reference:
Crude protein comb. method 0.3 ISO/CD 15670 Water 1.0 ISO 6496 Ash 0.8 ISO 5985 -1978 Fat (soxhlet) 1.0 AOCS Ba 3-38 Astaxanthin esters Internal SSF

Table lb Results of analysis Sample No. SSF 2003-00592-01 Client's marking 27/2-03 Colony count per gram < 2500 Method: %CV: Method reference: Method: %CV: Method reference:
Colony count NMKL 146 Table ic:
Sample number 2003-Marking PI= fl Parameter Method Unit Date Phosphorus P-ICP-P g/100 DM 190203 3.06 Potassium K-ICP-P /100 DM 190203 0.101 Calcium CA-ICP-P /100 DM 190203 10.5 Magnesium MG-ICP-P /100g DM 190203 0.529 Sodium NA-ICP-P g/100g DM 190203 0.566 Sulphur S-ICP-P /100 DM 190203 0.317 Iron FE-ICP-P mg/kg DM 190203 51.1 Copper CU-ICP-P mg/kg DM 190203 63.4 Manganese MN-ICP-P m/k DM 190203 6.93 Zinc ZN-ICP-P mg/kg DM 190203 40.6 Molybdenum MO-ICP-P mg/kg DM 190203 <1.50 Boron B-ICP-P m/k DM 190203 10.1 Aluminium AL-ICP-P mg/kg DM 190203 39.9 Arsenic AS-ICP-F mg/kg DM 2.7 Mercury HG-CVAAS-F mg/kg DM 0.078 Table ld:
Results of analysis Sample number SSF 2003-00592-01 Client's marking 27/2-03 Aspartic acid Gram/100G Protein 8.1 Glutamic acid Gram/100G Protein 11.1 Hydroxyproline Gram/100G Protein <0.1 Serine Gram/100G Protein 4.7 Glycine Gram/I OOG Protein 5.4 Histidine Gram/100G Protein 2.6 Arginine Gram/100G Protein 6.6 Threonine Gram/I OOG Protein 4.0 Alanine Gram/100G Protein 4.8 Proline Gram/100G Protein 3.9 Tyrosine Gram/100G Protein 4.5 Valine Gram/100G Protein 4.2 Methionine Gram/100G Protein 2.0 Isoleucine Gram/100G Protein 3.6 Leucine Gram/100G Protein 5.3 Phenylalanine Gram/100G Protein 4.9 Lysine Gram/100G Protein 4.5 Table 2 Shrimp shell is sieveed from the by-products of the production of peeled shrimp. The shrimp shell is then passed into a screw press for removal of water, and subsequently subjected to a combined drying and grinding process. The resulting dried and ground 5 prawn shell is then analysed for:
- Amount of dry matter - Amount of protein - Amount of lipids - Amount of ash 10 - Amount of salt In addition, a bacteriological analysis was performed.
PRODUCT: ATLANTIC SHRIMPSHELL POWDER
Batch: 06-SSP-001 Mfg date: 12.10.06 Exp date: 12.10.07 CHEMICAL ANALYSIS:
Drymatter : 92,0 %
Protein : 35,2 %
Lipids :< 1%
Ash : 3$,6 %
Salt : < 0,1 %
BACTLRIOLOGICAL ANALYSIS:

Total number ofbacteria 200 Coliformbacteria (37 C) <10 Escherichia coli (44 C) <10 Salmonella Absent in 25 g Mould and yeast <100 Table 3 Analysis of nutrient content of the edible part of cooked shrimp.

NUMBER
tNiRIENi cONTENi OF 700 Breme adible product ~='SHRIMP,C00KED

ENEft6Y
Falyaeltl+ Ca,po. VltanilnAt ProtNn Fat Chol= 6hrch Dletary hlsne AAAnd VttaminA
1 aYJlat= Ilbre d autlar Alcohel tahlYatln0l EAlbh yyhr rahs d paAlon y a 6um<I+= Sumcla= dlaa<ch=-polY=
ono- Uum tlinhry eUJra Retlnal fibrn NY

t ( L ..
33 88 ~7~ 1ED1 '23.r$, 0~( 0 T T ~+ Pa~ 28 Q,'~ 1}T3dr A 0 I {
Im =;17d1 ~IF1 i i t0 Mlneralnsmlcf nMrlnnh VnominD V#nminE =AwminBqrouP YilamlRC
oroh+ry Tnlomma Nhan Yit11, 9ftatt eelomm tren semem POtAial m M+un==mm nno fieanlun, CoPPar Phoaphmu+
bAiof+r I Ribollevln hfiacin Folah aqulvNeM
Cu P
Ca Fe Na N kiq Zn So p4 my m4 m- m4 m4 m9 N4 P4 m4 m4 m4 m4 m4 m4 m4 U4 m4 m4 a~ri ~ a a at)( a~~ a 3 ~~ .~x~o- ~j]'~;sqf) oi(.~rj[ a-c~Jt} suo aa~. 4s .< ~
u asj su i~,qt \ ~.~~...}, x~:...~95.... ~ .... .fut+ s hb~=?v,v~~~.a.,;~'L r,.~.b~:l, .v~/~.. ~041. ,,.3~~1.. . 101~õ = ,=mx~ i>S'I~.s Table 4 Estimated protein and ash values for various mixtures of shrimp shell and sludge product from process water.
The estimated percentage values are weight percentage of dry matter. It is assumed that the dry matter constitutes 90% of the weight of the wet product. It is further assuined that SSP contains about 35 weight percent protein and about 38 weight percent ash relative to the dry matter weight. It is further assumed that the sludge product contains 70 weight percent protein and 0 weigllt percent ash relative to the dry matter weight.
SSP is solely shrimp shell powder, SSP10 is 90 weigllt percent shrimp shell powder io with 10 weight percent sludge product, based on the dry weight of the product.
Similarly, SP30 is 70 weight percent shrimp shell powder with 30 weight percent sludge product, based on the dry weight of the product. Sludge product is solely the sludge product. SP is shrimp powder.

Table 4 is not intended to limit the invention to the estimated or assumed values of the product content, but is merely meant as an example.

Specification Protein% Water% Ash% Fat% Astaxanthin SSP <35 <10 <38 <1 >50 m SSP10 38.5 34.5 SSP20 42 30.4 SP30 45.5 26.6 SP40 49 22.8 SP50 52.5 19 SP60 56 15.2 SP70 59.5 11.4 SP80 63 7.6 SP90 66.5 3.8 Sludge product 70 0

Claims (17)

1.
A process for the production of a shrimp derived powder, charact-erised in that the process comprises the following steps:
a) product A is mixed with product B, wherein product A comprises shrimp shell and product B comprises substances recovered from process water derived from processing of shrimps;
b) the mixture obtained in step a) is dried and optionally ground to obtain a powder having a water content that is lower than 15% (weight).

2.
A process according to claim 1, characterised in that product A is prepared by separating shrimp shell from process water that comes from the processing of shrimps.

3.
A process according to claim 2, characterised in that said separation is carried out using a sieve.

4.
A process according to any one of the preceding claims, charact-erised in that water is removed from the shell product.

5.
A process according to claim 1, characterised in that product B is prepared by separating the sludge product from process water that comes from the processing of shrimps.

6.
A process according to claim 5, characterised in that said separation is carried out using flotation.

7.
A process according to claim 6, characterised in that a polymer, such as chitosan, is added immediately before the flotation device.

8.
A process according to any one of claims 5-7, characterised in that water is removed from said sludge product.

9.
A process according to claims 4 or claim 8, characterised in that water is removed using a mechanical sieve such as a screw press.

10.
A process according to claim 1, characterised in that said mixture comprises about 10-90 weight percent product A and about 90-10 weight percent product B, wherein the weight percent is given with respect to the dry weight of the products.

11.
A process according to claim 10, c h a r a c t e r i s e d i n that said mixture comprises about 50 weight percent product A and about 50 weight percent product B, wherein the weight percent is given with respect to the dry weight of the products.

12.
A process according to claim 1, c h a r a c t e r i s e d i n that said mixture is dried before the mixture is ground, ground before the mixture is dried or dried and ground simultaneously.

13.
A process according to any one of the preceding claims, charact-erised in that said processing of shrimps is production of peeled shrimps.

14.
A process according to any one of the preceding claims, charac-terised in that said shrimp is Pandalus borealis or Pandalus jordani.

15.
A shrimp derived powder, characterised in that it is obtained by a process according to any one of claims 1-14.

16.
Use of the powder according to claim 15 in foods, animal feed, food supplements, cosmetics or in pharmaceutical products.

17.
An installation, characterised in that it is suitable for performing the process according to any of claims 1-14.