Water treatment system for internal-circulation running-water cultivation in pond

Abstract

The invention discloses a water treatment system for internal-circulation running-water cultivation in a pond. The water treatment system comprises a purification area (1), ecological islands (2), a breeding water tank (3), an aeration and water pushing area (4), a sewage collecting and drainage area (5), a working platform (6) and a pond (8). The long-strip-shaped ecological islands which are distributed in a staggered mode are arranged in the purification area, and aquatic plants are planted on the upper surfaces of the ecological islands and on the shallow water areas of side slopes of theecological islands, so that on one hand, water can be purified, on the other hand, water discharged from the breeding water tank can only flow along an "S-shaped" water path, a situation that the sewage is not fully purified and directly flows into the breeding water tank in a mode of "cutting a corner" is avoided, and meanwhile, a situation that dead water areas appear in a part of regions in thepond is avoided. The ecological islands are mainly prepared by piling the bottom mud of the pond, so that construction cost is low, the volume of the pond cannot be reduced, and shallow water areas and deep water areas can also be formed in the purification area, wherein the shallow water areas are beneficial to growth of aquatic plants, and the deep water areas can prevent water temperature frombeing too high in summer. Therefore, functions of purification areas of the pond can be enhanced, and the water purification effect can be improved.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and in particular relates to a water treatment system for circulating water aquaculture in a pond. Background technique [0002] Circulating water aquaculture in ponds is also called "sink type" aquaculture, "runway type" aquaculture, partitioned aquaculture, etc., which is to separate "culture area" and "purification area" in traditional ponds. The aquaculture area is mainly composed of water pushing devices, aquaculture tanks and sewage collection and discharge devices. The area of ​​aquaculture tanks accounts for about 2% to 5% of the total water surface, and the remaining 95% to 98% of the water surface is the water purification area. The basic principle of circulating water aquaculture in ponds is to keep fish captive in a small-scale aquaculture tank, and realize the water exchange between the "culture area" and the "purification area" through the aeration and pushing water device, whic...

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Problems solved by technology

[0003] The water depth of the existing internal circulation flowing water aquaculture pond is generally about 2-3m. Since the light in the water is much weaker than that on the land, it is difficult for ordinary emergent plants and submerged plants to grow at this depth, so algae proliferate in large numbers, which affects the water quality.

At the same time, due to the large water surface in the purification area, the sewage discharged from the fish tank is easy to "cut corners" into the fish tank, and the pollutants cannot be fully purified. At the same time, dead water is prone to appear in some areas of the pond, which affects the pond. Purification effect of "purification zone" on water quality

There is also a circulating water aquaculture device in a pond that sets the aquaculture tank between two ponds, and the middle ridge acts as an isolation dam, which can avoid the phenomenon of sewage "cutting corners" to a certain extent, but due to the size of the pond Larger (generally more than 15 mu), so it cannot completely solve the problem of "dead water area", and ordinary isolation dams cannot replace the purification function of emergent plants and submerged plants for pollutants

There are also some circulating water aquaculture systems in ponds that set floating beds in the "purification zone" to plant aquatic plants, but the production cost of the floating beds is high, the operation is inconvenient, and it is easy to be damaged when encountering strong winds, and it is easier to form a "dead water zone".

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