Patent Description:
Aquafarming is mostly performed in oceans, lakes and ponds where e.g. fish is grown in an often industrial manner. In small scale, such aquafarming is a great and environmentally sound way of producing food. However, when the scale of the production becomes too large, aquafarming becomes a liability to the environment providing the water with so much residues that it becomes polluted. The scale of aquafarming in natural water thereby has a natural limit set by how much residues the environment can take care of. To increase production from aquafarming beyond that limit it has in recent years become increasingly popular to set up land based aquafarming in tanks.

A prior art solution in the filed can be found in the patent document <CIT> disclosing a net cage for farming of marine organisms, where the net cage is comprised of a main chamber to hold the marine organisms and where the net cage has further water chambers to treat the water before it is circulated back to the main chamber. Another prior art solution in the field can be found in the patent document <CIT> disclosing a partition board made up of a three-tier fiber-reinforced hollow structure consisting of a honeycomb core with hollow parts of a thermoplastic resin arranged in parallel, an intermediate layer which is formed by integrating reinforcing fibers with a thermosetting resin in one piece and covers the outer periphery of the core and an outer layer of the thermoplastic resin covering the intermediate layer. A still further example of prior art in the field can be found in <CIT> disclosing waste water tank with an outer peripheral side wall implanted in a loop-shape concrete base and a plurality of foundation piles are driven in the center part of the conical circular installation surface surrounded by the outer peripheral side wall and a flat disc-shape concrete fixing stand is anchored thereon. A rubber sheet with thickness of about <NUM> is closely applied to the bottom surface from the fixing stand to the inner perphery of the outer peripheral side wall <NUM> and the inner peripheral surface of the outer peripheral side wall <NUM> to form a tub-shape tank body.

Land based tanks for aquafarming often have problems of being expensive as they need to be constructed to stand for the heavy load of large volumes of water. A need to keep the surfaces of the tank clean also presents a problem not present in aquafarming in natural watercourses.

A further problem with land based aquafarming is that the water in the tanks has to be kept clean and oxygenated to a correct level. This can be solved by placing the tanks close to a large watercourse or ocean and simply constantly replacing the water. However, such locations are often fairly inaccessible making it expensive to bring building material for large tanks to the site for the aquafarming.

There is thus a need in the industry for better solutions when moving aqua farming onto land.

It is an object of the present disclosure to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages in the prior art and solve at least the above mentioned problem. According to a first aspect there is provided an aquafarming tank for growing species that live in water, the aquafarming tank comprising: a wall shaped as a bowl so as to enable containment of a liquid. The wall comprises a structural bearing wall element and a first sheet for providing an inner layer of the wall. The first sheet of the wall is attached to the structural bearing wall element and adapted to be in contact with the liquid contained in the aquafarming tank. The first sheet of the wall is made of a solid surface material composed of aluminium trihydrate or aluminium monohydrate and a polymer binding medium.

The solid surface material is antiseptic reducing the need for cleaning and presenting surface that is not harmful for the species, e.g. fish, that is grown in the tank. By only using the solid surface material as an inner layer and using the structural bearing wall element to handle the load of the liquid, the amount of solid surface material can be reduced, keeping price and weight of the tank down.

Any water-living species may be grown in the tank. It could be marine species, anadromous species, or fresh water species. The species could be fish, any other water-living animal or plant based species that live in water.

The polymer binding medium is an acryl-modified polyester. ATH or AMH and a polymer are so similar to each other in their chemical structure so that, when the solid surface material has cured, it will not absorb liquids or other chemical agents. The material is so insensitive to other substances that it can even stand most acids without being stained or absorbing any of it. This has the effect that the aquafarming tank will be easy to clean, and since it does not absorb other substances easily it will have an antiseptic property. This makes the aquafarming tank durable with a long lifetime which will bring down maintenance costs to a minimum.

The solid surface material has an ATH or an AMH content of above <NUM>%. According to some embodiments, the solid surface material has a ATH or AMH content of <NUM> - <NUM>% by weight, more preferably <NUM> - <NUM>% by weight and most preferably <NUM>-<NUM>% by weight. A high ratio of ATH or AMH to binder material will give the material good heat resistance and also make it so dense that it has excellent antiseptic properties. Having <NUM>% ATH or AMH to binder in the solid surface material, the material will withstand temperatures of up to <NUM>, which is very good from a fire safety perspective.

According to some embodiments, the first sheet of the wall has a thickness in the range of <NUM> to <NUM>. Using a relatively thin first sheet keeps weight and costs down while still presenting the advantageous properties discussed above towards the content of the tank. It may be important with a minimized weight as aquafarming tanks many timed advantageously are built at inaccessible places to which transportation may be difficult.

According to some embodiments, the structural bearing wall element is made of concrete. Concrete is suitable as the structural bearing wall element as it is strong, durable, fairly inexpensive and easy to mold. The downside is that the material is heavy, but in some cases sand can be found locally at the chosen site for the aquafarming tank.

According to some embodiments, the inner side of the concrete structural bearing wall element is covered by a honeycomb structure plate that is attached to the first sheet, wherein the honeycomb structure plate has columnar cells extending in a direction perpendicular to the first sheet. The honeycomb structure plate may have a thickness about <NUM>-<NUM>. The purpose is to present a rigid surface that does not move due to heat expansion etc. so that the solid surface sheet is dot damaged by cracks during the lifetime of the aquafarming tank.

According to some embodiments, the structural bearing wall element is a honeycomb structure plate with columnar cells extending in a direction perpendicular to the first sheet. The honeycomb structure plate thereby replaces the concrete of the previously mentioned embodiment as structural bearing wall element. As honeycomb materials are lightweight while extremely torsionally rigid, a stable foundation for the first layer of solid state material is provided while having a very small weight compared to a concrete based tank. Transportation of the building material for the tank is thereby much easier.

According to some embodiments, the wall has a sandwich construction the aquafarming comprises the structural bearing wall element made of the honeycomb structure plate; the first sheet for providing an inner layer of the wall attached to the inner side of the structural bearing wall element; a second sheet for providing an outer layer of the wall attached to the outer side of the structural bearing wall element. The wall of the tank is thus built up by a sandwich structure with the first sheet towards the inside of the tank is made of solid state material, the middle part is made by honeycomb material. The outer second sheet does not have to be solid surface material. It could be any sheet material, preferably plastic or metal.

According to some embodiments, the honeycomb structure plate has a thickness in the range of <NUM> to <NUM>. If the honeycomb structure plate act as the structural bearing wall element, then the honeycomb structure plate preferably is <NUM> to <NUM> thick to make the wall extremely torsionally rigid. If the structural bearing wall element, and the honeycomb material is only supporting the solid surface material, then the plat can be <NUM> to <NUM> thick.

According to some embodiments, the honeycomb structure plate is constructed by aluminium or plastic to present a durable, corrosion free and lightweight honeycomb material.

According to some embodiments, the honeycomb structure plate has columnar cells that are hexagonal in shape, a shape that has proven strong in nature.

According to some embodiments, the first sheet, the honeycomb structure plate and the first sheet, or the sandwich construction of the wall is comprised by a bottom wall element; and plural side wall elements. The parts are connected via bottom connection profiles shaped to lockingly engage the side wall elements with the bottom wall element. Further, side connection profiles shaped to lockingly engage one side wall element with another side wall element are used.

The bottom connection profiles and the side connection profiles are preferably made of aluminium to present light weight connection parts that are durable and have low maintenance needs.

According to some embodiments, the bottom wall element comprises at least one edge profile and the plural side wall elements further comprises at least one edge profile arranged at the edges of the bottom wall element and the plural side wall elements for engaging with the bottom connection profiles or the side connection profiles. The edge profiles are securely integrated in the bottom wall elements or side wall elements and preferably made from the same material as the side connection profiles and the bottom connection profiles to avoid corrosion, preferably aluminium or plastic.

According to some embodiments, aquafarming tank has a cylindrical shape; a number n planar side wall elements; and a bottom wall element that has a shape with n edges for receiving the n planar side wall elements via the bottom connection profiles to build the tank shape from a number of smaller element. That makes transportation easier when building the aquafarming tank.

According to some embodiments, the bottom wall element is constructed by a number of rectangular bottom wall elements and a number of triangular bottom wall elements to form a bottom wall element. The bottom wall element is thereby constructed by a number of smaller part making transportation easier.

According to some embodiments, the planar side wall elements are substantially rectangular to produce a vertical tank side wall. However, the side wall elements may also be trapezoidal or triangular to produce a tank side wall leaning outwards or inwards.

According to a second aspect there is provided a method of constructing the aquafarming tank according to the first aspect, the method comprising the steps of: constructing a mould arranged to receive the honeycomb structure plates and the first sheet with a distance D between the mould and the honeycomb structure plates; mounting the honeycomb structure plates and the first sheet with a distance D between the mould and the honeycomb structure plates using the bottom connection profiles and the side connection profiles. Concrete is then moulded in the mould between the mould and the honeycomb structure plates. When the concrete is hardened the mould may optionally be removed.

Effects and features of the second aspect are to a large extent analogous to those described above in connection with the first aspect.

The present disclosure will become apparent from the detailed description given below. The detailed description and specific examples disclose preferred embodiments of the disclosure by way of illustration only. Those skilled in the art understand from guidance in the detailed description that changes and modifications may be made within the scope of the disclosure.

<FIG> shows an example of the first aspect of this disclosure disclosing an aquafarming tank <NUM> for growing water-living species, e.g. fish. The aquafarming tank <NUM> comprises a wall <NUM> shaped as a bowl so as to enable containment of a liquid. With reference to <FIG>, the wall <NUM> comprises a structural bearing wall element <NUM>,<NUM>', and a first sheet <NUM> for providing an inner layer of the wall <NUM>. The first sheet <NUM> of the wall <NUM> is attached to the structural bearing wall element <NUM>,<NUM>' and adapted to be in contact with the liquid contained in the aquafarming tank <NUM>. The first sheet <NUM> of the wall <NUM> is made of a solid surface material composed of aluminium trihydrate ATH or aluminium monohydrate AMH and a polymer binding medium. The solid surface material presents a very dense surface to the water which is hard to penetrate for any substance, which has the effect that the surface has antiseptic properties. The solid surface material of the first sheet preferably has an ATH or an AMH content of above <NUM>%. The first sheet <NUM> of the wall <NUM> has a thickness in the range of <NUM> to <NUM>. As seen in <FIG>, the first sheet is thin in relation to the structural bearing wall element <NUM>.

In <FIG> the structural bearing wall element <NUM>' is made of concrete. The inner side of the concrete structural bearing wall element <NUM>' is covered by a honeycomb structure plate <NUM>' that is attached to the first sheet <NUM>, wherein the honeycomb structure plate <NUM>' has columnar cells extending in a direction perpendicular to the first sheet <NUM>. The thickness of the honeycomb plate in <FIG> is in the <NUM>-<NUM>. In <FIG> the concrete structural bearing wall element <NUM>' is cut away to show the honeycomb structure plate <NUM>' behind it. The mould <NUM>, used for moulding the concrete structural bearing wall element <NUM>' is also disclosed and cut away in the front part of the drawing. The mould <NUM> may be removed after moulding or it can be kept as an outermost layer of the aquafarming tank as protection of the concrete or just for a better or different visual appearance.

In <FIG>, <FIG> the structural bearing wall element is a honeycomb structure plate <NUM> with columnar cells extending in a direction perpendicular to the first sheet <NUM>. The wall has a sandwich construction made of the honeycomb structure plate <NUM>, the first sheet <NUM> for providing an inner layer of the wall <NUM> attached to the inner side of the structural bearing wall element <NUM> and a second sheet <NUM> for providing an outer layer of the wall <NUM> attached to the outer side of the structural bearing wall element <NUM>. The second sheet <NUM> does not have to be solid surface material. It could be any sheet material, preferably plastic or metal to provide an outer surface of the aquafarming tank that has low maintenance needs.

The honeycomb structure plate <NUM>,<NUM>' has a thickness in the range of <NUM> to <NUM>. In <FIG>, where the structural bearing wall element <NUM>' is made of concrete, the thickness of the honeycomb structure plate <NUM>' is in the lower region of the interval as the structural bearing function of the aquafarming tank is achieved by the concrete structural bearing wall element <NUM>'. In <FIG>, <FIG>, the thickness of the honeycomb structure plate <NUM>' is preferably <NUM> to <NUM> to make the wall extremely torsionally rigid.

The honeycomb structure plate <NUM>,<NUM>' in all embodiments is constructed by aluminium. However, it could be constructed by other lightweight and strong materials as carbon fibre materials or plastic. The honeycomb structure plate <NUM>,<NUM>' has columnar cells that are hexagonal in shape (not shown).

With reference to <FIG>, <FIG> is disclosed how the wall <NUM> of the aquafarming tank can be divided into wall elements that can be built into a compete wall. The reason to have smaller parts is to make transportation of the aquafarming tank wall easer. The bottom wall element <NUM> and plural side wall elements <NUM> are connected via bottom connection profiles <NUM> shaped to lockingly engage the side wall elements <NUM> with the bottom wall element <NUM> and side connection profiles <NUM> shaped to lockingly engage one side wall element <NUM> with another side wall element <NUM>. the bottom wall element <NUM> comprises at least one edge profile <NUM> and the plural side wall elements <NUM> further comprises at least one edge profile <NUM> arranged at the edges of the bottom wall element <NUM> and the plural side wall elements <NUM> for engaging with the bottom connection profiles <NUM> or the side connection profiles <NUM>. The aquafarming tank <NUM> has a cylindrical shape with a number n planar side wall elements <NUM> and a bottom wall element <NUM> that has a shape with n edges for receiving the n planar side wall elements via the bottom connection profiles <NUM>.

With reference to <FIG> the bottom wall element <NUM> is constructed by a number of rectangular bottom wall elements <NUM>,<NUM> and a number of triangular bottom wall elements <NUM> to form a bottom wall element <NUM> that resembles a rectangle with rounded corners. The planar side wall elements <NUM> are substantially rectangular.

With reference to <FIG> an aquafarming tank is disclosed with the bottom <NUM> of <FIG> and the side wall elements <NUM> of <FIG>. An aquafarming tank is thus achieved by a large number of smaller sections making transportation of the parts for the aquafarming tank easy.

<FIG> discloses the second aspect of this disclosure. The flow diagram represents a method of constructing the aquafarming tank of the first and comprises the steps of: constructing S1 a mould <NUM> arranged to receive the honeycomb structure plates <NUM>,<NUM>' and the first sheet <NUM> with a distance D (see <FIG>) between the mould and the honeycomb structure plates; mounting S2 the honeycomb structure plates <NUM>,<NUM>' and the first sheet <NUM> with a distance D between the mould <NUM> and the honeycomb structure plates <NUM>,<NUM>' using the bottom connection profiles and the side connection profiles; moulding S3 concrete in the mould <NUM> between the mould <NUM> and the honeycomb structure plates <NUM>,<NUM>'.

Claim 1:
An aquafarming tank (<NUM>) for growing species that live in water, the aquafarming tank (<NUM>) comprising:
a wall (<NUM>) shaped as a bowl so as to enable containment of a liquid;
wherein the wall (<NUM>) comprises
a structural bearing wall element (<NUM>, <NUM>'); and
a first sheet (<NUM>) for providing an inner layer of the wall (<NUM>);
wherein the first sheet (<NUM>) of the wall (<NUM>) is attached to the structural bearing wall element (<NUM>, <NUM>') and adapted to be in contact with the liquid contained in the aquafarming tank (<NUM>); and
characterised in that
the first sheet (<NUM>) of the wall (<NUM>) is made of a solid surface material composed of aluminium trihydrate (ATH) or aluminium monohydrate (AMH) and a polymer binding medium,
wherein the solid surface material contains ATH or AMH to an extent of above <NUM>%.