Light filtration medium for water treatment and preparation method and application thereof

A filter medium and water treatment technology, which is applied in the field of lightweight filter medium for water treatment and its preparation, can solve the problems of long sewage treatment process, short filtration cycle, low void ratio of quartz sand filter material, etc., and reduce backwash Time and water consumption, large filtration capacity, and the effect of saving backwashing time

Active Publication Date: 2015-10-28
北京魔砂科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the existing sand filtration technology, due to the high specificity of the sand filter material (above 2.60), it is difficult to achieve relatively sufficient backwashing, and the amount of backwashing water is large; secondly, due to the low porosity of the quartz sand filter material (50 % below), small surface area (0.04m 2 /g), so its pollution interception ability is poor, and there are also the status quo that the filter material is easy to harden (dead zone), frequent backwashing (because it is difficult to achieve sufficient backwashing, so the number of backwashing is often increased), which seriously affects the Water quality and production efficiency of water plant effluent
Therefore, due to improper selection of filter media, the existing sand filter technology has many problems such as high energy consumption, short filter cycle,

Method used

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  • Light filtration medium for water treatment and preparation method and application thereof
  • Light filtration medium for water treatment and preparation method and application thereof
  • Light filtration medium for water treatment and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] After adding foaming agent (magnesium carbonate or sodium bicarbonate), foaming agent accelerator (borax) and modifying agent (barium sulfate) to fine glass powder (purchased directly, the particle size is about 400 μm), mix well to obtain mixed raw materials;

[0061] The mixed raw materials are melted and foamed (not lower than 600°C), then cooled, pulverized and screened in sequence to obtain foam glass that can be used as a light filter medium for water treatment.

Embodiment 2

[0063] Crushing waste glass to obtain 3-5mm glass shards, and crushing the glass shards into fine glass powder with a particle size of 100-400 μm;

[0064] After adding 2 parts of foaming agent (carbon black), 1 part of foaming agent accelerator (sodium nitrate) and modifying agent (sodium pyrophosphate) to 97 parts by weight of fine glass powder, mix evenly to obtain mixed raw materials;

[0065] After the mixed raw materials are melted and foamed, they are sequentially cooled and pulverized again to obtain foam glass; wherein, during the process of melting and foaming, the melting and foaming furnace is raised to 600°C at a rate of 10°C / min, and foamed for 3-4 Hour.

Embodiment 3

[0067] Crushing waste glass to obtain 3-5mm glass shards, and using a pulverizer to crush the glass shards into fine glass powder with a particle size of 100-400 μm;

[0068] After adding 3 parts of foaming agent (silicon carbide), 2 parts of foaming agent accelerator (sodium fluorosilicate) and modifier (antimony trioxide) to 95 parts by weight of fine glass powder (in equal proportions), the Mix well to obtain mixed raw materials;

[0069] After the mixed raw materials are melted and foamed, they are naturally cooled and pulverized again (with a particle size of 0.5-1.0 mm) to obtain foam glass; wherein, during the process of melting and foaming, the melting and foaming furnace is raised to 1000°C, and foam for 2-3 hours.

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Abstract

The invention provides a light filtration medium for water treatment and a preparation method and application thereof, and belongs to the field of water treatment. The light filtration medium for water treatment adopts granular foam glass. The preparation method of the light filtration medium includes the following steps: adding a foaming agent, a foaming agent promoter and a modifier into the fine glass powder, and mixing uniformly to obtain a mixed raw material; smelting and foaming the mixed raw material, and then sequentially cooling and smashing again, so as to obtain the foam glass which can be used as the light filtration medium for water treatment. The foam glass has the characteristics of being high in voidage, large in specific surface area, porous and light; during the using process, the filtering speed is high, the effluent quality is excellent, and the material filtering layer is quite easy to expand (with a highest expansion ratio of 200%) during back washing, which facilitates the back washing in a fast and effective manner and provides guarantee for performing microflocculation rapid filtration; in addition, the surface of the foam glass filtration medium is uneven with multiple corner angles, high in voidage and large in specific surface area, and has excellent suspended solids retention property.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a lightweight filter medium for water treatment and its preparation method and application. Background technique [0002] Filtration is the most widely used process technology in the field of water treatment. At present, almost all water purification industries must use filtration technology. Moreover, with the strengthening of environmental protection laws, most urban sewage treatment plants must meet the first-class A standard in the "Pollutant Discharge Standards for Urban Wastewater Treatment Plants GB18918-2002". Therefore, filtration technology has also become one of the indispensable treatment methods for urban sewage treatment plants to reach the first-class A standard. [0003] In related technologies, considering factors such as the economy, maturity and practicability of treatment, in the existing filtration technology, the traditional sand filtration technology with or...

Claims

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Application Information

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IPC IPC(8): B01D39/06
Inventor 崔学烈崔旸河俊秀
Owner 北京魔砂科技有限公司
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