Low-density ceramsite filter material for biological aerated filter, and preparation method thereof

Abstract

The invention relates to a low-density ceramsite filter material for a biological aerated filter, and a preparation method thereof. The invention provides the low-density ceramsite filter material for the biological aerated filter, and the low-density ceramsite filter material is mainly prepared from Guizhou soil, clay, pottery clay, Yichun soil, pore former, adhesive and a charcoal material. Theinvention also provides a preparation method for the low-density ceramsite filter material. The invention has the advantages that: the Guizhou soil, clay, pottery clay, Yichun soil, pore former, adhesive and charcoal powder are used as raw materials, so that the excellent physical properties such as a large specific surface area, and high surface roughness and mechanical strength and the like of the low-density conventional heavy ceramsite filter material are kept, the density of the low-density ceramsite filter material is reduced well so as to reduce energy consumption during backwashing, contribute to complete backwashing, and avoid the problem that the filter material is hardened during long-term running and the like, the production cost and the waste water treatment cost are greatly reduced, and the popularization and application of the biological aerated filter process can be facilitated.

Description

technical field [0001] The invention relates to water treatment, in particular to a low-density ceramsite filter material used in biological aerated filter tanks in water treatment and a preparation method thereof. Background technique [0002] Biological Aerated Filter (BAF) is an aerobic biofilm wastewater treatment process that combines biological contact oxidation with water filtration. It belongs to biological filtration technology. It mainly uses the interception and The dual role of biodegradation of the biofilm on the filter media removes pollutants. [0003] At present, there are two commonly used BAF processes, Biostry and Biofor, and the Biofor process is widely used because of the use of low-cost heavy filter materials. At present, the filter materials used in the Biofor process include ceramsite, volcanic rock, zeolite, etc., and ceramsite is widely used due to its advantages such as large specific surface area, rough surface, high mechanical strength, good bio...

AI Technical Summary

Problems solved by technology

However, the ceramsite filter materials currently on the market generally have a higher apparent density (generally 1.8g / cm 3 ), resulting in high energy consumption during BAF backwashing and incomplete backwashing, which is not conducive to the promotion and development of the biological aerated filter process

At the same time, the production cost of higher density ceramsite filter material is higher

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