Frame Fish Tank For Fish Farm

Solid liquid separator (residual bait fecal separator):

In RAS, the waste discharged from aquaculture ponds contains a large amount of particulate matter such as residual bait and feces, which needs to be removed as much as possible in the early treatment unit to reduce the organic load of subsequent treatment units. As an integral processing unit of the entire system, the solid-liquid separator can not only facilitate the removal of particulate matter such as residual bait and feces during manual and heavy operations, but also prevent pipeline blockage and equipment corrosion in subsequent processing units. It can also reduce local head loss in the pipeline and save system energy consumption.

The technology of diverting sewage from fish ponds: The density of organic fish farming is high, and the amount of solid waste produced is high. It is the main source of pollution in the aquaculture industry. The removal of organic matter and ammonia nitrogen in the fish first relies on timely cleaning of a large amount of feces and residual bait (removed from the source), followed by purification of the fish.

Fish excrement and feed residues can increase the organic matter content of aquaculture organisms. Excessive organic matter can trigger the proliferation of organic matter digesting bacteria and compete with ammonia nitrogen converting bacteria in the biofilm for long space, dissolved oxygen, and nutrients. The reproduction rate of organic matter digesting bacteria and ammonia nitrogen transforming bacteria is much faster, and Nitrifying bacteria (Nitrifying bacteria) are difficult to compete with heterotrophic bacteria, resulting in the slow growth of nitrifying bacteria and the low ammonia nitrogen removal rate of the filter in the aquaculture system. When the ratio of COD to ammonia nitrogen is greater than 2.7, the ammonia nitrogen removal rate will decrease by about 70%. If a particulate filter has an organic carrying capacity of 2.5gBOD/m/day, its nitrification rate is only 30%. The efficiency of 5gBOD/m/day is theoretically zero.

In the traditional single channel bottom discharge mode, the discharge of aquaculture wastewater is at a fixed distance from the microfilter. When the aquaculture wastewater reaches the microfilter, many residual bait and fish excrement are easily decomposed into larger particles or ammonia nitrogen during the movement of the pipeline and the impact of the microfilter's rotating filtration; If these particulate organic matter passes through the microfiltration machine, it will inevitably increase the processing burden of subsequent processes.

Therefore, the shunt discharge technology of fish ponds is crucial as the second process of sewage treatment system in the entire aquaculture system, and is a prerequisite for achieving system purification. There are four or two thousand yuan of work to be done. There is a significant effect on improving the processing efficiency and reducing the investment in system equipment.

The shunt discharge technology combines bottom discharge with surface overflow technology to effectively and timely discharge sediment particles, avoiding secondary crushing caused by particles entering the microfilter, reducing organic load, and stabilizing soil quality. It reduces the nutrient source of microorganisms such as bacteria, effectively preventing bacterial proliferation, and preventing the consequences of reduced dissolved oxygen and excessive COD in the environment. The recycling treatment system is composed of a trough or a porous flat overflow pipe arranged on the surface of the fish pond, which can make the oil and foam floating on the surface of the fish pond achieve a good collection and removal effect, and also play a role in keeping the water level.

Reducing the organic load as much as possible in the organic filter will facilitate the nitrification of ammonia. Reducing the carrying capacity of organic filters and removing some solid substances (the main source of organic matter) is a basic method. The timely discharge of solid particles by the shunt sewage system of the fish pond is more effective and saves investment by increasing the capacity of the filter. Otherwise, the capacity of the particulate filter will be improperly increased due to achieving the same nitrification process.

Reducing the load and energy consumption of mechanized circulation and aquaculture systems in the treatment of wastewater through shunt discharge technology.

Vortex separation: The aquaculture pool adopts a vortex separation design, and the vortex tube on the wall of the aquaculture pool lifts the vortex rotation speed of the body in the pool, accelerating the settling speed of solid particles and shortening the settling time. Collection and discharge of fecal solid waste; The switch at the bottom of the device must be opened by the operator at regular intervals to discharge the settled aquaculture waste. The settling speed of solid particles produced by different fish feed is different, and fine and loose particles can only settle at a speed of 0.01 cm/s, making it difficult for solid particles to effectively concentrate at the bottom of the tank.

The vortex rotation of the solid particles in the pond is accelerated by the vortex tube on the pond wall, which can accelerate the settling speed of solid particles up to 2-5 cm/s, shorten the settling time, and enable viscous and undisturbed feces to settle well, thus solving the problem of solid particle deposition in the aquaculture pond. 90% of feces and 98% of untreated feed and other solid particles are concentrated at the bottom of the sewage discharge system without passing through a circulating sewage treatment system.

Tongue Sole 

The flesh of this fish is white and light in flavor, but still satisfying. It is very delicate so needs to be handled carefully. The main problems with this fish are its small size, and as with all other fish of this flat form, the fin rays along the edges just about all the way around.

Cook this fish as fillets because the fin rays are very annoying to deal with after cooking. The flesh breaks up very easily so it's not good for soups but will work very well in recipes like casseroles where it will not be disturbed during cooking.

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