High-density porous support for treating wastewater of biological fluidized bed and preparation method thereof

Abstract

The invention relates to a high-density porous support for treating wastewater of a biological fluidized bed and a preparation method thereof, belonging to a sewage treatment technology. The high-density porous support is prepared from fly ash, clay, coal gangue, a pore forming material, a caking agent and water in percentage by weight. Particularly, the high-density porous support is prepared by mixing, tabletting and forming, drying, calcining, grinding and crushing, reaming with inorganic acid or alkaline, drying, impregnating with a 20-35 percent exocellular polysaccharide water solution and drying in shade. The preparation method comprises the following steps of: firstly, uniformly mixing and stirring 10-20 percent of fly ash, 40-50 percent of clay, 5-20 percent of coal gangue and 2-10 percent of pore forming material, feeding 15-20 percent of water and 2-10 percent of caking agent again and stirring again, and ageing for 3-5 days; secondly, tabletting mixture, drying the mixture at a temperature of 80-100DEG C for 4-5h, transferring the dried mixture into a muffle furnace and calcining at the high temperature of 1000-1100DEG C for 2-4h; cooling, grinding, crushing and screening by using a sieve mesh with 20-40 meshes; and thirdly, feeding the screened granules into the inorganic acid or alkali and reaming, drying and then impregnating with the 20-35 percent exocellular polysaccharide water solution and drying in shade to obtain the high-density porous support.

Description

technical field [0001] The invention relates to a high-density porous carrier used for biological fluidized bed wastewater treatment and a preparation method thereof, which belongs to the sewage treatment technology. The high-density porous carrier GM-1 is prepared from fly ash, coal gangue and other wastes through a simple process, and is suitable for various wastewater biological treatment. Background technique [0002] Wastewater biological treatment is a sewage treatment technology that appeared at the end of the 19th century, and has become an important means of sewage treatment in countries all over the world. Wastewater biological treatment is to use the metabolism of microorganisms to remove organic pollutants and certain inorganic toxic substances (such as cyanide, sulfide, etc.) in wastewater, and convert them into non-toxic and harmless inorganic substances (such as carbon dioxide and water). process. Commonly used wastewater biological treatment methods include...

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Problems solved by technology

It has high strength, good toughness, impact resistance, good affinity and adhesion to microorganisms; at the same time, the weak magnetic field provided by the magnetic powder stimulates the growth of microorganisms, shortens their growth cycle, accelerates the renewal of new and old biofilms, and makes wastewater treatment more efficient. However, due to its small specific gravity, there is a small relative fluidization velocity difference between the fluidized carrier and the liquid phase in the downflow area during the operation of the fluidized bed, resulting in insufficient performance, and particles in the downflow area will be blocked and affect fluidization stability. sexual issues

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