Multi-stage aerobic-anaerobic compound biological filter bed

Abstract

The invention belongs to the technical field of biological filter beds, and particularly relates to a multi-stage aerobic-anaerobic compound biological filter bed, comprising a water inlet pipe and more than two stages of filter beds; the height of a liquid level of each stage of the filter bed is gradually reduced and each filter bed is divided into a water inlet groove, a filtering chamber and a water outlet groove by rectification walls; each filtering chamber is filled with filler layers; the grain diameters of fillers of the filler layers at the two sides are great and the grain diameters of the fillers of the middle filler layer are small; the grain diameters of the fillers of the middle filler layer are sequentially reduced according to the stages of the filter beds; a water outlet end of the water inlet pipe is arranged at the bottom of the water inlet groove of the foremost stage of the filter bed and the bottoms of the water outlet grooves of the upper and lower stages of the filter beds are communicated through a siphon; the bottom of the water outlet groove of the final stage of the filter bed is connected with a water discharging groove; the middle filler layer is internally provided with a ventilated vertical pipe, a ventilated main pipe and a ventilated branch pipe; the ventilated branch pipe is provided with air vents at intervals and plants which can degrade pollutants are planted at the upper parts of the filler layers. With the adoption of the structure, the multi-stage aerobic-anaerobic compound biological filter bed provided by the invention has the advantages of small occupied area, convenience for construction, lower cost, wide application range and the like.

Description

technical field [0001] The invention belongs to the technical field of biological filter beds, in particular to a multi-stage aerobic-anaerobic composite biological filter bed for aquaculture circulating water treatment. Background technique [0002] At present, conventional physical, chemical and biochemical processes are mainly used at home and abroad to treat aquaculture circulating water. The physical method requires the provision of equipment and power devices, and the method is rough, and only combined use can achieve better results; the chemical method requires high technical conditions, and the process is complex, energy consumption is large, and secondary pollution is easy to form. The organic matter in aquaculture circulating water is mainly carbohydrates, proteins, fats, etc., which have good biodegradability and are especially suitable for biological treatment technology. [0003] The traditional biomembrane filter has the characteristics of less sludge generati...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-stage aerobic-anaerobic composite biological filter bed with low construction and operating costs, not easy to block, and good treatment effect, so as to solve technical problems such as nitrogen accumulation in circulating aquaculture water

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