Multi-direction flow gravitational settling apparatus for recirculating aquaculture system

Abstract

The invention provides a multi-direction flow gravitational settling apparatus for a recirculating aquaculture system. The cavity of a vertically arranged barrel-shaped water passing container is divided into an upper straight barrel-shaped settling chamber and a lower inverted cone-shaped sewage collecting chamber by a separator plate horizontally arranged in the water passing container; the upper end of the water passing container is an open end, and the end part of the upper end is embedded into a water collecting tank with an upwardly opened opening; the lower end of a 7-shaped water inlet pipe extends downwardly to penetrate the bottom of the water collecting tank, and the upper end of the 7-shaped water inlet pipe extends into the upper part of the settling chamber to communicate with the upper end of a vertical water distribution pipe; the port of the lower end of the water distribution pipe extends into a central through hole of the porous separator plate; an inclined tube filling material is filled in the part of the settling chamber below a water outlet end of the water inlet pipe; a sewage outlet is arranged at a cone bottom of the sewage collecting chamber; and the sewage outlet is movably covered with a water distributing cone, and the conical tip of the water distributing cone just faces the port of the lower end of the water distributing pipe. The apparatus provided by the invention has a simple structure, a compact shape, great water treating capacity, short hydraulic retention time and a substantial treating effect, is convenient to apply and can be popularized as equipment.

Description

technical field [0001] The invention relates to the field of circulating aquaculture, in particular to a device for removing and settling solid particles. Background technique [0002] The removal of solid particles is a key factor in recirculating aquaculture systems, which mainly come from fish feces, food residues and shed microbial mass. The untimely removal of solid particles will have a great impact on the aquaculture water body and the aquaculture objects, which are mainly reflected in the following aspects: ① Directly damage the gills of fish and reduce the resistance of fish to diseases; ② Increase the consumption of oxygen during the decomposition process, easily Cause aquaculture water hypoxia; ③Block the biological filter, affect the biological treatment effect, and limit the carrying capacity of the system; ④Mineralization increases the concentration of harmful substances such as ammonia nitrogen in the system. [0003] The gravity sedimentation method is the s...

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Problems solved by technology

[0004] At present, the gravity sedimentation and removal devices for solid particles used in circulating aquaculture systems mainly include hydrocyclones and vertical flow settlers. The basic principle of hydrocyclones is centrifugal sedimentation, and the structure is relatively complicated. Rotating motion occurs, the internal flow state is complex, and it is difficult to effectively control the removal effect; the structure of the vertical flow precipitator is simple, but there will be a large amount of solid suspended particles floating on the water surface of the precipitator, which is difficult to settle and affects the sedimentation efficiency

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