Lightweight highly effective filtering material for biology and its preparation method

Abstract

The invention relates the method of producing filtering material used in bio-aeration filter tank. The lightweight and highly effective biology filtering material comprises 65wt%-80wt% red earth ore, 10wt%-30wt% coal ash and 5wt%-15wt% pore-forming agent. The method comprises the following steps: breaking the 65wt%-80wt% red earth ore, drying at 130Deg.C-170Deg.C; fetching 10wt%-30wt% coal ash; fetching 5wt%-15wt% pore-forming agent, water content being below 3%, mixing them, adding water to form ball, drying, calcining, at 1050Deg.C-1250Deg.C, cooling, breaking, barreling and screening until the grain size being 3-8mm. The invention has the advantages of macroporous structure, rough surface, proper void ratio and large specific surface area. Every property is satisfied for the request of bio-aeration filter tank filtering material.

Description

Technical field: [0001] The invention mainly relates to a filter material suitable for a biological aeration filter tank and a preparation method thereof. Background technique: [0002] Biological aerated filter is a new technology of high-efficiency and energy-saving sewage treatment. It has the advantages of good treatment effect, short hydraulic retention time, small volume, small footprint, and low operating cost. It has been widely used at home and abroad. [0003] The treatment effect and economy of the biological aerated filter are closely related to the properties of the filter material used. The filter material of the biological aerated filter has a suspended filter material with a specific gravity less than 1, which is generally made of light plastic, such as polypropylene and polyethylene. The high price of these filter materials greatly increases the engineering investment of the biological aeration filter, especially in our country, it is still difficult to pop...

AI Technical Summary

Problems solved by technology

These filter materials are expensive, which greatly increases the engineering investment of biological aeration filters, especially in our country, it is still difficult to promote and use them in actual projects.

At present, fixed filter materials with a specific gravity greater than 1 are commonly used, such as quartz sand, coke, anthracite, ceramsite, and some other mineral materials. Among them, ceramsite has the best performance, and most of them are spherical sintered ceramics. Granular filter material, the process is to use clay through batching, molding, and sintering into granular shape, which has the characteristics of high strength, low density, water resistance and high chemical stability, but the existing problems are 1. The sintered ceramsite filter material is generally shaped After sintering, the outer surface is relatively smooth, and it is not easy to form a film during the water treatment process, which affects the effect of water treatment; 2. The specific surface area of ​​the ceramsite filter material is low, and the porosity is not high

[0004] Patent No. 01122346.4 is titled "A Powerful Hanging Film Filter Material and Its Production Method", which discloses a filter material and its production method, mainly using red mud and fly ash as raw materials, and its production process is batching, molding, Sintered into granules, this kind of filter material is used in the process of water treatment, the effect of film formation is not ideal, and its specific surface area and porosity are measured to be low