Suspension ceramsite filter material for water treatment and production method thereof

A technology of ceramsite filter material and production method, which is applied in the field of water treatment, can solve the problems that the biological film is not strong enough, the biological film is easy to fall off, and the operation energy consumption is large, and achieves a light weight, strong hydrophilicity and uniform texture. Effect

Inactive Publication Date: 2013-09-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the suspension fillers currently used are all made of plastic materials, the surface is hydrophobic, and the biofilm is not strong enough, and the biofilm is easy to fall off during backwashing
When used for sewage treatment, due to the small specific surface area and low biomass of plastic suspended fillers, it is not enough to complete biological purification alone, and it is usually used in conjunction with activated sludge method; in the biological pretreatment process of water supply, the pollution degree of raw water It often shows seasonal changes. In some periods of time, the pollution of raw water is slight, the dissolved oxygen in the water is sufficient, and no oxygen supply is needed. However, in order to maintain the fluidized state of the plastic suspended filler, a large aeration intensity is still required, otherwise the suspended filler will either float on the water surface, or It sinks to the bottom of the pool and cannot fully mix and contact with the water flow, so the operation consumes a lot of energy

Method used

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  • Suspension ceramsite filter material for water treatment and production method thereof
  • Suspension ceramsite filter material for water treatment and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Step 1, the initial production of shale ceramsite. Shale is selected as the raw material, and the shale mineral group is mainly illite, montmorillonite, kaolinite, and quartz, and the main component is Si0 2 The content is 57.7%, A1 2 o 3 The content is 18.4%, Fe 2 o 3 The CaO content is 7.2%, and the CaO content is 2.6%. Crush the shale to a particle size of 5-20mm, dry it in a drying oven at 100°C for 6 hours, put it into a ball mill for full grinding, and sieve to control the particle size range of 100-180 mesh, and send it to a rotary granulator for granulation , the particle size of the original filter material is 5-15mm; it is fired in a rotary kiln for 22 minutes at a firing temperature of 1200°C, and the fired ceramsite is naturally cooled to obtain the initial shale ceramsite product; the obtained shale ceramsite water-infiltrated particle density 3 The proportion is 2%, which can ensure that more than 95% of the ceramsite is suspended or sinks below the l...

Embodiment 2

[0024] Step 1: select shale as raw material, crush the shale to a particle size of 5-20mm, dry it in a drying oven at 100°C for 6 hours, put it into a ball mill for grinding, and then sieve to control the particle size range of 100-180 mesh, send After being granulated and shaped by a rotary granulator, the particle size of the original filter material is 5-15mm; it is fired in a rotary kiln for 20 minutes at a firing temperature of 1300°C, and the fired ceramsite is naturally cooled to obtain an initial shale ceramsite product; Shale ceramsite water soaked particle density 3 The ratio is 1.4%.

[0025]Step 2, sieve the ceramsite obtained in step 1, select a particle size of 8-12 mm, and put it into the pool for flotation; while transporting the ceramsite into the pool, replenish water to maintain 4-5 L / (m 2 .s) Aeration intensity, the floating ceramsite that flows out of the pool with the effluent is a qualified product, and the ceramsite in the storage tank does not meet the...

Embodiment 3

[0028] Step 1. Select suitable shale as raw material, crush the shale to a particle size of 5-20mm, dry it in a drying oven at 100°C for 6 hours, put it into a ball mill for grinding, and then sieve to control the particle size range of 100-180 mesh. Send it to the rotary disc granulator for granulation and shape, and the particle size of the original filter material is 5-15mm; it is fired in a rotary kiln for 18 minutes at a firing temperature of 1300°C, and the fired ceramsite is naturally cooled to obtain the initial shale ceramsite product; The obtained shale ceramsite water-soaked particle density is less than 0.9g / cm 3 The ratio is 1.7%.

[0029] Step 2, sieve the ceramsite obtained in step 1, select a particle size of 8-12 mm, and put it into the pool for flotation; while transporting the ceramsite into the pool, replenish water to maintain 4-5 L / (m 2 .s) Aeration intensity, the floating ceramsite that flows out of the pool with the effluent is a qualified product, and...

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Abstract

The invention discloses a suspension ceramsite filter material for water treatment and a production method of the suspension ceramsite filter material. The method comprises the following steps of: crushing shale which serves as a raw material through a crusher, drying the shale, milling the shale through a ball mill, granulating the shale through a rotary table granulator, and firing in a rotary kiln at the firing temperature of 1,100 to 1,300 DEG C for 18 to 22min; naturally cooling and sieving ceramsites, selecting a grain size of 8 to 12mm, and floating in a water pool under the aeration intensity of 3 to 5L / (m<2>.s) to obtain floatation ceramsites; and wetting the floatation ceramsites in water to obtain the grain density of 0.9 to 1.1g / cm<3>. Shale ceramsites have the characteristics of hydrophilic surface, roughness, porosity, film formation, difficulty in dropping of a bio-film, large specific surface area and high mechanical strength, have the advantages of difficulty in hardening of a suspension filler, uniform water distribution and air distribution, low filtering head loss, light weight and washability, and are suitable for serving as bio-mass carriers for biological sewage treatment and biological micro-polluted water source water supply treatment.

Description

technical field [0001] The invention relates to a filler for water treatment, in particular to a suspended ceramsite filter material for water treatment and a production method thereof, belonging to the technical field of water treatment. Background technique [0002] Clay ceramsite is a porous light material with large specific surface area, high porosity, good stability, does not contain harmful ingredients to human body, and is cheap. It has been widely used in water treatment in recent years. Filter media and microbial carriers for biochemical treatment. Especially in the biological aerated filter, it is the most widely used filter material at present. When ceramsite filter material is used for biological treatment, in order to improve the efficiency of biological treatment, the thickness of the filter material of the biological aerated filter is generally selected to be more than 3m. The ceramsite in the layer above 2m is washed to the expanded state, making it more d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C02F3/10
CPCY02W10/10
Inventor 陆少鸣杨立
Owner SOUTH CHINA UNIV OF TECH
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