Composite biological filter material

Abstract

The invention relates to the technical field of biological filter materials, and in particular, relates to a composite biological filter material and a preparation method thereof. The composite biological filter material comprises a plurality of layers of biological filter materials which are sequentially stacked; each layer of biological filter material comprises a basalt filter material and a fixing frame for fixing the basalt filter material, a plurality of fixing holes for fixing the basalt filter material are uniformly distributed in the fixing frame, the porosity of the basalt filter materials in the plurality of layers of biological filter materials is sequentially reduced from top to bottom, and the volume of the basalt filter materials in the plurality of layers of biological filter materials is sequentially reduced from top to bottom. According to the invention, the plurality of layers of biological filter materials are arranged; the porosity and the volume of each layer of biological filter material are adjusted; the biological filter material on the uppermost layer is maximum in porosity, maximum in size and large in water circulation amount, the film culturing efficiency and the film culturing area are remarkably improved, dirt is removed step by step from top to bottom, on one hand, the sewage treatment capacity is improved, and on the other hand, the biological filter material with low porosity on the lower layer can be effectively protected, so that the service life of the biological filter material is prolonged, and the use cost is reduced.

Description

technical field [0001] The invention relates to the technical field of biological filter materials, in particular to a composite biological filter material. Background technique [0002] The materials of biological filter materials mainly include plastic, sand, lignite, zeolite, slag, activated carbon, coke, ceramsite and basalt (volcanic slag) on ​​the market. Compared with other materials, basalt (volcanic slag) biological filter material has the following characteristics on the basis of the basic requirements of comprehensive biological filter material: 1. The filter material has less compaction; 2. The porosity is large and the enrichment The biomass is large and the organic load is high; 3. The porosity is large, and the effect of simultaneous denitrification is good; 4. The porosity is large, and the residual biomass of washing is guaranteed. However, the existing basalt filter material still has the disadvantages of low film attachment efficiency and low backwashing ...

AI Technical Summary

Problems solved by technology

However, the existing basalt filter material still has the disadvantages of low film attachment efficiency and low backwashing efficiency when used alone, and the existing basalt filter material forms a filter layer after stacking, but the porosity of each layer inside the basalt after stacking Not adjustable, difficult to control filtration efficiency

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