JPH01174316A - Method for cleaning culture farm - Google Patents

Abstract

PURPOSE:To prevent contamination or putrefaction of water quality of culture farms for eels, lobsters, shrimps, etc., by jetting water with a high dissolved oxygen content at a prescribed depth to form undercurrent layers and wholly eliminating stagnation by the undercurrent layers. CONSTITUTION:For example, in a culture farm, such as culture pond 1, water is drawn up therefrom using a lifting pump 2 with a filter to sufficiently dissolve oxygen in air. The resultant water with a high dissolved oxygen content is then jetted through a water feed pump 4 and a valve 5 from jetting nozzles 7 into the bottom of the above-mentioned pond and form undercurrent layers 8. Thereby aerobic bacteria can be propagated. As a result, clean water quality is retained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a purification method for preventing water pollution or spoilage in a farm for eel or shrimp, etc., and maintaining water quality suitable for aquaculture. It is related to.

[Prior Art] In general, in this type of aquaculture farm, as a measure to prevent water pollution and water spoilage, water wheels are rotated on the water surface,
Alternatively, an air pump is used to blow air into the water and bring out oxygen from the air into the water.

In particular, a major cause of water pollution in aquaculture farms and similar ponds is that stagnation occurs when the water flow stagnates, and the bottom of the stagnation area lacks oxygen, causing aerobic microorganisms. Bacteria cannot survive, anaerobic bacteria multiply, and sludge builds up. In other words, since the surface layer of water is in contact with air,
Although a moderate amount of oxygen will be dissolved, the dissolved oxygen will not reach the bottom of the stagnation, and sludge will gradually accumulate from the bottom of the stagnation, generating methane gas, etc., and the water quality will become even more polluted. . Therefore, if the water quality becomes contaminated, it will not only have a significant negative impact on aquaculture, but also cause a foul odor, leading to environmental pollution. They employ methods such as blowing air into the water.

[Problems to be Solved by the Invention] The means for rotating the water wheel in the conventional example described above supplies oxygen at the surface of the water, and even if there is some agitation, the water wheel in the water wheel is rotated only at the surface layer. There is almost no oxygen supply to the bottom layer of the water, and water pollution is still unavoidable, creating a major problem in ensuring proper water quality. In addition, the supply of air by an air pump only supplies oxygen to the area where the air is being discharged, and is only localized, which still poses a major problem in terms of suitable water quality. In any case, the problem of overall purification has not been solved.

[Means for Solving the Problems] As a specific means for solving the above-mentioned problems, the present invention forms a bottom flow layer by injecting water with a large amount of dissolved oxygen at a predetermined depth. This method provides a purification method for aquaculture farms that is characterized by eliminating stagnation as a whole by using a flow layer, and by forming a bottom flow layer with water with a high amount of dissolved oxygen, oxygen is delivered to deep locations. can be supplied, thereby allowing aerobic bacteria to propagate and eliminating sludge deposits formed by anaerobic bacteria.
Overall, it is possible to maintain clean water quality with a high amount of dissolved oxygen.

[Embodiment] Next, the present invention will be explained in more detail with reference to the illustrated embodiment. For example, in one aquaculture pond 1, water is pumped up from the aquaculture pond 1 by a pump 2 with a filter, and air is added to the pumped water. It is returned to the melon cultivation pond 1 via an oxygen dissolving device 3 that sufficiently dissolves the oxygen contained therein. In this case, rather than simply pouring the water into the aquaculture pond 1 and returning it, the water is returned so that a predetermined flow layer is formed in the bottom layer of the aquaculture pond.

That is, after dissolving sufficient oxygen in the pumped water, a predetermined pipe 6 is laid underwater along the edge of the aquaculture pond 1 via a predetermined water pump 4 and a valve 5, and a large number of Water with a large amount of dissolved oxygen is injected from each injection nozzle to form a predetermined flow layer, the so-called bottom flow layer 8, in the bottom layer. The injection depth in this case depends on the overall depth of the aquaculture pond 1, but the injection is made at a height of approximately 10 to 30 rJ. Then, if the injected water moves in a predetermined direction in the bottom layer, an even more purifying effect can be obtained as a whole.

Incidentally, the nozzle 7 is provided by attaching a separate item or by drilling a predetermined hole in the piping.

[Description of operation] As described above, the method of the present invention forms a bottom flow layer at a predetermined depth position, and since the bottom flow layer is formed of water with a large amount of dissolved oxygen, it is usually performed at a deep position. Oxygen is forcibly supplied to the stagnant parts of the water, leaving no room for anaerobic bacteria to breed, eliminating the accumulation of sludge, and causing aerobic bacteria to breed and inevitably contaminating the water. This prevents water pollution and maintains clean water quality. The formation of the bottom flow layer described above must be formed over a long period of time in cases of severe pollution, but after the water quality has become -H clean, it is not necessarily necessary to form it continuously. In some cases, it may be sufficient to perform the test intermittently at predetermined intervals of time or days. The above explanation was given regarding the purification of aquaculture farms, but it is of course applicable not only to aquaculture farms but also to the purification of indoor or outdoor ponds, reservoirs, and even unused pools where water quality is contaminated. It is.

[Effects of the Invention] As explained above, the method for purifying an aquaculture farm according to the present invention forms a bottom flow layer by injecting water with a high amount of dissolved oxygen at a predetermined depth, and the bottom flow layer purifies the entire fish farm. By eliminating stagnation, sufficient oxygen is supplied deep down, suppressing the growth of anaerobic bacteria that causes sludge accumulation, and significantly promoting the growth of aerobic bacteria. This has the excellent effect of maintaining clean water quality throughout the area.

Furthermore, water with a high amount of dissolved oxygen can be pumped up from the surface layer or generated using a cable dissolution device and simply injected into the vicinity of the bottom via piping, so it can be purified easily and efficiently. It also has the excellent effect of being able to do so.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of implementing the method of the present invention. 1... Aquaculture pond 2... Water pump 3... Oxygen dissolving device 4... Water pump 5... Valve 6... ... Piping 7 ... Nozzle 8 ... Bottom fluid layer patent applicant Toppan Shoji Co., Ltd.

Claims (3)

[Claims] (1) A method for purifying an aquaculture farm characterized by forming a bottom flow layer by injecting water with a high amount of dissolved oxygen at a predetermined depth, and eliminating stagnation as a whole by the bottom flow layer. (2) The method for purifying a farm according to item (1) above, wherein water with a high amount of dissolved oxygen is pumped from the surface layer or generated using an oxygen dissolving device. (3) The method for purifying an aquaculture farm according to item (1) above, wherein the bottom flow layer is formed by injecting water with a high amount of dissolved oxygen from pipes laid at a predetermined depth.