Filter material having phosphor adsorbing and biological membrane function and its preparing method

A technology of biological film hanging and filter material, applied in the field of treatment system, can solve the loss and loss of phosphorus adsorption surface, only suitable for the removal of organic matter in sewage, high sintering cost, to solve the problem of disposal and solve the problem of gray water separation. Effect

Inactive Publication Date: 2005-03-02
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

In order to make the product achieve the required compressive strength and stability for sewage treatment, a high temperature sintering method of 800°C-1100°C is adopted. Not only is the process complicated, the sintering cost is high, and the phosphorus adsorption surface is caused during the sintering process. A large loss, not suitable for the removal of phosphorus in sewage
Although the "composite filler for sewage treatment biofilm process" disclosed in Chinese invention patent CN1486940A does not require sintering, in order to bond into balls and achieve sufficient strength, 35%-45% of cement binder must be added, resulting in phosphorus Large loss of adsorption surface, only suitable for removal of organic matter and ammonia nitrogen in sewage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The raw material is fly ash from a power plant in Shanghai, and its composition is as follows: CaO is artificially adjusted to 19.3%, MgO is 7.6%, Fe 2 o 3 8.8%, Al 2 o 3 16.7%, SiO 2 was 46.9%. Put 100 grams of sieved 200-mesh fly ash and 0.5 grams of solidifying agent sodium silicate into the mixing container, mix evenly and spray 15 grams of water, and then spray 5 grams of water after stirring for 5 minutes, and continue stirring until it becomes dense. Firm clumps. After being tested and placed at a height of 0.5m without breaking, the mixture is put into a high-speed rotary granulator for granulation. After molding, it is naturally cured for 2 days, during which water is sprayed every 7 hours to maintain the water content of the granules at 10%. The finished filter material has a compressive strength of 4Mpa and a specific gravity of 1.44g / cm 3 , The particle size is between 1-5mm. According to the commonly used Langmuir method, the phosphorus adsorption c...

Embodiment 2

[0028] The raw material is fly ash from a power plant in Xiamen, and its composition is as follows: CaO is artificially adjusted to 5.3%, MgO is 3.8%, Fe 2 o 3 7.9%, Al2 o 3 25.8%, SiO 2 was 54.9%. Put 100 grams of sieved 200-mesh fly ash and 3 grams of calcium silicate as a curing agent into the mixing container, mix evenly and spray 25 grams of water, and then spray 5 grams of water after stirring for 10 minutes, and continue stirring until it becomes dense. Firm clumps. After being tested and placed at a height of 0.5m without breaking, the mixture is put into a high-speed rotary granulator for granulation. Natural curing for 7 days after forming, during which water is sprayed every 12 hours to maintain the water content of the granules at 40%. The finished filter material has a compressive strength of 1.5Mpa and a specific gravity of 1.43g / cm 3 , The particle size is between 1-5mm. The phosphorus adsorption capacity measured by the commonly used Langmuir method was ...

Embodiment 3

[0030] The raw material is fly ash from a power plant in Shenzhen, and its composition is as follows: CaO is manually adjusted to 15.2%, MgO is 1.8%, Fe 2 o 3 2.7%, Al 2 o 3 25.4%, SiO 2 was 51.1%. Put 100 grams of sieved 200-mesh fly ash and 1.5 grams of curing agent calcium silicate into the mixing container, mix evenly and spray 20 grams of water, and then spray 5 grams of water after stirring for 8 minutes, and continue stirring until it becomes dense. Firm clumps. After being tested and placed at a height of 0.5m without breaking, the mixture is put into a high-speed rotary granulator for granulation. After forming, it is naturally cured for 5 days, during which water is sprayed every 8 hours to maintain the water content of the granules at 15%. The finished filter material has a compressive strength of 2Mpa and a specific gravity of 1.43g / cm 3 , The particle size is between 1-5mm. According to the commonly used Langmuir method, the phosphorus adsorption capacity ...

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Abstract

The filter material with phosphor adsorbing and biological membrane hanging functions is prepared with flyash with CaO content of 5-20 % as material, and through stoving, sieving, mixing with water and small amount of curing agent via stirring, pelletizing in a high speed turntable pelletizer, and naturally cured for 2-7 days while spraying water to maintain the water content of 10-40 % to form the spherical filter material. The filter material has irregular rough surface with microporous structure for biological membrane to grow easily. The filter material has the advantages of fast absorbing phosphate in great amount, and eliminating SS, BOD and other soluble organic matter from sewage. The present invention may be used widely in water treating industry, especially in directly purifying rich nutrients water.

Description

technical field [0001] The present invention relates to a filter material for the advanced treatment of eutrophic surface water or sewage and a preparation method thereof, more specifically to a filter material with high-efficiency phosphorus adsorption and biological film-hanging functions using fly ash as a raw material and a preparation method thereof. It is suitable for lake and river eutrophic water, urban domestic sewage, and various industrial wastewater treatment systems, and belongs to the technical field of environmental engineering sewage treatment. Background technique [0002] In recent years, large areas of water eutrophication have appeared in Taihu Lake, Dianchi Lake and other watersheds in my country. Severe eutrophication will lead to blue-green algae outbreaks, resulting in a sharp drop in water quality, a large number of aquatic animals such as fish and shrimp in the water will die, and at the same time, it will cause difficulties in drinking water for ur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F3/10
CPCY02W10/10
Inventor 孔海南陈雪初陈建钢
Owner SHANGHAI JIAO TONG UNIV
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