Constructed wetland composite filling material for water treatment and preparation method thereof

A technology of artificial wetlands and composite fillers, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the effects of good hydrophilicity, high porosity, and large specific surface area

Inactive Publication Date: 2012-06-06
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So far, there have been no reports on the composite filler for constructed wetlands and the method for preparing the composite filler for constructed wetlands using surplus sludge from municipal domestic sewage plants, red mud from alumina industrial waste, and crop residues in rural areas as the main raw materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The method for preparing artificial wetland composite filler of the present invention, comprises the following steps:

[0025] 1) The remaining sludge from the municipal domestic sewage plant and the red mud from the alumina industrial waste are dehydrated, dried, and pulverized with a pulverizer until the particle size is 80-200 mesh. The straw is crushed and carbonized with a carbonization furnace.

[0026] 2) Mix the red mud, sludge and straw carbon prepared in step 1 with water glass, kaolin, and white cement in proportion, add water and stir, and prepare pellets with a particle size of 8-17mm with a granulator, and the weight percentage is : sludge 10%-20%; red mud 20%-30%; straw carbon 5%-10%; water glass 3%-8%; kaolin 1%-5%; white cement 6%-15%; balance for water.

[0027] 3) Heat the pellets prepared in step 2 at 80-250°C for 1-4 hours, keep warm for 1-2 hours, cool to room temperature naturally, water and maintain for 3-12 hours, and dry naturally to obtain t...

Embodiment 1

[0033] 1) The remaining sludge from the municipal domestic sewage plant and the red mud from the alumina industrial waste were dehydrated, dried, and pulverized with a pulverizer until the particle size was 100 mesh. The straw is crushed and carbonized with a carbonization furnace.

[0034] 2) Mix the red mud, sludge and straw carbon prepared in step 1 with water glass, kaolin, and white cement in proportion, then add water and stir, and use a granulator to prepare pellets with a particle size of 15mm, which are used to prepare artificial wetland composites The weight percent of the filler is: 20% of sludge; 30% of red mud; 10% of straw carbon; 5% of water glass; 5% of kaolin; 15% of white cement; 15% of water.

[0035] 3) Heat the pellets prepared in step 2 at 100°C for 2 hours, keep warm for 1 hour, cool down to room temperature naturally, water and maintain for 3 hours, and dry naturally to get this product.

Embodiment 2

[0037] 1) The remaining sludge from the municipal domestic sewage plant and the red mud from the alumina industrial waste were dehydrated, dried, and pulverized with a pulverizer until the particle size was 200 mesh. The straw is crushed and carbonized with a carbonization furnace.

[0038] 2) Mix the red mud, sludge and straw carbon prepared in step 1 with water glass, kaolin, and white cement in proportion, then add water and stir, and use a granulator to prepare pellets with a particle size of 8mm, which are used to prepare artificial wetland composites The percentage by weight of the filler is: 20% of sludge; 30% of red mud; 10% of straw carbon; 8% of water glass; 5% of kaolin; 15% of white cement; 12% of water.

[0039] 3) Heat the pellets prepared in step 2 at 200°C for 1 hour, keep warm for 2 hours, cool down to room temperature naturally, water and maintain for 4 hours, and dry naturally to obtain this product.

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Abstract

The invention discloses a constructed wetland composite filling material for water treatment and a preparation method thereof. The constructed wetland composite filling material for water treatment is composed of small balls having sizes of 8 to 17 millimeters and comprises: by weight, 10 to 20% of sludge, 20 to 30% of red mud, 5 to 10% of straw carbon, 3 to 8% of sodium silicate, 1 to 5% of kaolin, 6 to 15% of white cement and the balance water. The preparation method comprises the following steps of carrying out dehydration, drying and crushing processes respectively on sludge and red mud, crushing and carbonizing straw, mixing sodium silicate, kaolin, white cement, the obtained straw carbon, the crushed red mud and the crushed sludge according to a certain ratio, adding water into the mixture, stirring to obtain small balls having sizes of 8 to 17 millimeters, heating the small balls at a temperature of 80 to 250 DEG C, carrying out heat preservation, naturally cooling to room temperature, and drying in air. The constructed wetland composite filling material for water treatment has wide raw material sources, a low cost, good hydrophily, a large specific surface area, high porosity, strong adsorptivity and good bio-film formation effects, and improves sewage pollutant removal effects produced by a constructed wetland.

Description

technical field [0001] The invention belongs to the field of water treatment for environmental protection, and in particular relates to a composite filler for artificial wetlands, which uses red mud from alumina plant industrial waste, residual sludge from municipal sewage treatment plants, and crop residue straw as main raw materials. [0002] The present invention also relates to a preparation method of the above artificial wetland composite filler. Background technique [0003] Constructed wetland is a new wastewater treatment technology developed in the past two decades. It has low investment, low energy consumption, low operating cost, stable treatment effect, strong impact load resistance, and can improve ecological landscape and biodiversity. It produces certain advantages such as economic and ecological benefits, and has been widely used in various water treatments, especially in rural domestic sewage treatment. [0004] The mechanism by which constructed wetlands r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/34B01J20/12
Inventor 赵颖席北斗夏训峰张列宇杨天学李晓光
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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