Intermittent siphon type biological filter for aquaculture

Abstract

The invention relates to an intermittent siphon type biological filter for aquaculture. An exhaust one-way valve is arranged at the top end of a filter material barrel, and an upper filter material baffle and a lower filter material baffle which are hollowed out are fixedly arranged in the filter material barrel; a water inlet is formed at a position, higher than the upper filter material baffle,of the side wall of the filter material barrel, a water outlet is formed at a position, lower than the lower filter material baffle, of the side wall, the water outlet is communicated with an inverted-U-shaped water outlet pipe, and the tail end of a lower bent section of the water outlet pipe is lower than the water outlet; the filter material barrel is provided with a group of air inlets near the height of the lower filter material baffle, the air inlets are communicated with an air inlet pipe, and the upper end of the air inlet pipe is higher than a highest part of the water outlet pipe; the inner diameter of the water inlet is smaller than the inner diameters of the water outlet and the water outlet pipe, so that negative pressure is formed in the filter material barrel. According to the siphon principle, a filter material is impacted through intermittent emptying of the filter and natural air suction, full emission of particulate matters in the filter and automatic flushing of thebiological filter material can be achieved, meanwhile, oxygen is increased for a water body, and extra power is not needed.

Description

technical field [0001] The invention relates to a biological filter for aquaculture, in particular to an intermittent siphon biological filter for aquaculture. Background technique [0002] Traditional biological filters are usually operated in constant flow, which is prone to accumulation of particulate matter and the surface of the filter material is covered with suspended solids. Regular sewage discharge and filter material backwashing are required. In addition, aeration is required to provide oxygen for the nitrifying bacteria attached to the filter material. During this process, traditional biofilters have the following disadvantages: [0003] 1) It is necessary to discharge sewage regularly to ensure that no particles accumulate inside the cylinder and operate frequently; [0004] 2) The biological filter material is kept rolling in the water through fan aeration to ensure that the filter material is clean and aerated to increase oxygen, and a large amount of air dire...

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Problems solved by technology

[0005] 3) The structure is generally more complicated. If the cavity is filled with water, structures such as deflector cylinders and deflector plates are required to ensure the movement trajectory of the filter material in order to achieve the required water treatment effect.

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