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

A biological fluidized bed and porous carrier technology is applied in the fields of sewage treatment, high-density porous carrier and its preparation. Sewage treatment efficiency, beneficial to microbial attachment, and the effect of improving mass transfer speed and efficiency

Inactive Publication Date: 2011-10-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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. How...

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Mix 1Kg of fly ash, 4.8Kg of kaolin, 2Kg of coal gangue and 0.2Kg of nylon evenly, then add 1.7Kg of water and 0.3Kg of polyethylene glycol-400 for secondary stirring, and age for 3 days , the mixture was pressed into tablets, dried at 80°C for 4h, then moved into a muffle furnace for calcination, and calcined at 1000°C for 2h. Grind and pulverize after cooling, and sieve with a 20-40 mesh screen. Then put the carrier into 10mol / L hydrochloric acid to expand the pores, after drying, immerse in 35% concentration of exopolysaccharide aqueous solution for 30 min, and dry in the shade to obtain the high-density porous carrier GM-1, in which the exopolysaccharide Glucose 2.625Kg, rhamnose 1.575Kg, mannose 1.05Kg, water 9.75Kg in polysaccharide aqueous solution.

[0043] The weight percentages of the above added materials are: fly ash 10%, kaolin 48%, coal gangue 20%, nylon 2%, water 17%, polyethylene glycol-400 3%. The mass ratio of glucose, rhamnose and mannose in the pse...

Embodiment 2

[0047] Stir the mixture of 1.2Kg of fly ash, 5Kg of bentonite, 1Kg of coal gangue and 0.2Kg of acrylic fibers evenly, then add 2Kg of water and 0.6Kg of polyvinyl alcohol for secondary stirring, age for 4 days, and press the mixture The flakes were dried at 100°C for 5h, then moved into a muffle furnace for calcination, and calcined at 1050°C for 2h. Grind and pulverize after cooling, and sieve with a 20-40 mesh screen. Then put the carrier into 10mol / L nitric acid to expand the pores, after drying, immerse in a 30% concentration of exopolysaccharide aqueous solution for 30 min, and dry in the shade to obtain the high-density porous carrier GM-1, in which the exopolysaccharide Glucose 1.8Kg, rhamnose 1.8Kg, mannose 0.9Kg, water 10.5Kg in polysaccharide aqueous solution.

[0048] The weight percentages of the above added materials are: fly ash 12%, bentonite 50%, coal gangue 10%, acrylic fiber 2%, water 20%, polyvinyl alcohol 6%. The mass ratio of glucose, rhamnose and mannos...

Embodiment 3

[0052] Stir 1.8Kg of fly ash, 4.7Kg of attapulgite, 0.7Kg of coal gangue and 0.4Kg of polypropylene fiber mixture evenly, then add 1.9Kg of water and 0.5Kg of phosphoric acid for secondary stirring, and age for 5 days. The mixture was pressed into tablets, dried at 90°C for 4.5h, then moved into a muffle furnace for calcination, and calcined at 1000°C for 3h. Grind and pulverize after cooling, and sieve with a 20-40 mesh screen. Then the carrier was put into 10mol / L sodium hydroxide to expand the pores, after drying, it was immersed in 25% concentration of exopolysaccharide aqueous solution for 30 min, and dried in the shade to obtain the high-density porous carrier GM-1. Glucose 1.125Kg, rhamnose 1.5Kg, mannose 1.125Kg, water 11.25Kg in exopolysaccharide aqueous solution.

[0053] The weight percentages of the above added materials are: fly ash 18%, attapulgite 47%, coal gangue 7%, polypropylene fiber 4%, water 19%, polyvinyl alcohol 5%. The mass ratio of glucose, rhamnose ...

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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...

Claims

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Application Information

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IPC IPC(8): C02F3/00C02F3/10C02F3/34
CPCY02W10/10
Inventor 沈树宝冯杨阳陆蓓蓓陈英文祝社民王孙崯蒋钰
Owner NANJING UNIV OF TECH
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