Novel biological filter sand and application thereof in quicksand filter

Abstract

The invention belongs to the technical field of preparation of water treatment environment-friendly materials, and particularly discloses novel biological filter sand and application thereof in a quicksand filter. The novel biological filter sand disclosed by the invention can replace common quartz sand and is applied to a quicksand filter. A preparation method comprises the following steps: pretreating volcanic rock, mixing 55wt%-60wt% of volcanic rock obtained after pretreatment with 40wt%-45wt% of a modified material, and plasticizing, granulating, crushing, grinding and sieving an obtainedmixture to obtain thenovel biological filter sand. Wherein the used modified material is prepared from the following raw materials in parts by weight: 100 to 150 parts of LDPE, 0.3 to 0.5 part of zinc stearate, 0.1 to 0.5 part of LDTPE 0.3 to 0.7 part of a lubricant, 3 to 5 parts of EVA, 1 to 3 parts of a foaming agent and 350 to 500 parts of CaCO3. The biological filter sand prepared by the method has the advantages of large specific surface area, corrosion resistance, durability, simple process, high filler flowability, small monomer particle size, high unit density and the like under the action of aeration scouring, and the specific gravity is slightly greater than 1.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental protection materials for water treatment, and in particular relates to a novel biological filter sand and its application in quicksand filters. Background technique [0002] In wastewater treatment, quicksand filter is a good physical filtration device, which mainly uses the internal quartz sand filler to effectively intercept suspended solids and colloids in wastewater to purify water. The good filtering effect of quartz sand filler is closely related to its physical characteristics such as negative charge on the surface and small particle size. Although quartz sand has many excellent physical properties, it is difficult to form biofilm on the surface of quartz sand filler, because microorganisms generally have negative charges, and quartz sand filler does not have adsorption function, so the treatment of organic wastewater can only play a role To the role of physical interc...

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Problems solved by technology

However, their specific gravity is generally small. Under no external force, these fillers will generally be suspended on the water surface, and it is difficult to realize the suspension movement up and down in the water, and cannot fully contact with the pollutants in the water, and the cost of these fillers is relatively high.

In addition, the physical properties of these fillers basically do not have the function of physical filtration

[0004] Therefore, in fluidized bed processes such as quicksand filters, the above-mentioned common biological fillers such as Pall rings, MBBR fillers, biological suspension balls, ceramic rings, etc. are not suitable

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