Permeable reactive barrier filler

A technology of active percolation wall and filler, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of single function and high cost of filling medium, and achieve low cost, cheap price and abundant resources Effect

Inactive Publication Date: 2016-01-13
北京至清时光环保工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Commonly used filling media are: a. Limestone, used to neutralize acidic groundwater or remove heavy metals; b. Activated carbon, used to remove non-polar pollutants and CCl 4 , benzene, etc.; c. zeolite and synthetic ion exchange resin to remove dissolved heavy metals; d. iron filings, etc., the cost of the above-mentioned filling medium is relatively high, and the function is often relatively simple

Method used

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  • Permeable reactive barrier filler

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The preparation process of the active percolation wall filler described in the present embodiment is as follows: figure 1 As shown, limestone and steel slag are crushed into granules with a particle size of less than 15cm by a jaw crusher, and then sent to a ball mill for grinding, and ground into a powder with a particle size of 150 to 200 meshes. As an example, in this embodiment The steel slag is converter slag from a steel plant, which contains: 20wt% FeO, 38wt% CaO, 12wt% SiO 2 , 10wt% MgO, 5wt% MnO, 3wt% Al 2 o 3 , and 1.2wt% P 2 o 5 , and other components of the balance. Then mix the prepared limestone powder and steel slag powder in a steel container at a mass ratio of 6:4, add water and stir evenly to obtain a mixture, and the amount of water added is 10-15 wt% of the filler. The mixture is sent to the pelletizing machine for pelletizing, and the ball diameter is controlled to be 5-20mm. Finally, the prepared filler with a ball diameter of 5-20 mm is drie...

Embodiment 2

[0025] Use a jaw crusher to crush limestone and steel slag into granules with a particle size of less than 15 cm, and then send them to a ball mill for grinding, and grind them into powders with a particle size of 150 to 200 meshes. As an example, the steel slag in this embodiment is Converter slag from a steel plant, which contains: 20wt% FeO, 38wt% CaO, 12wt% SiO 2 , 10wt% MgO, 5wt% MnO, 3wt% Al 2 o 3 , and 1.2wt% P 2 o 5 , and other components of the balance. In this embodiment, the milled steel slag is subjected to steam calcination treatment in a circulating fluidized bed, and the flow ratio of steam and air is controlled to be 2:8 under normal pressure conditions, and the calcination treatment is controlled under turbulent flow. The temperature is 800-900°C, and the treatment time is 60 minutes. Then mix the prepared limestone powder and steel slag powder in a steel container at a mass ratio of 6:4, add water and stir evenly to obtain a mixture, and the amount of wa...

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Abstract

The invention relates to permeable reactive barrier filler, and belongs to the technical field of underground water pollution control. The filler is prepared from the following raw materials in percentage by weight: 30-40 percent of steel slag powder and 60-70 percent of limestone powder; and the steel slag powder and the limestone powder are mixed, granulated and dried to obtain the filler. The limestone and steel slag serving as raw materials of the filler have rich resources and low prices, and the preparation process is simple and has relatively low cost. The filler in a barrier can be used for purifying pollutants in water when the polluted underground water passes through the permeable reactive barrier, and various metal ions in the water can be effectively adsorbed.

Description

technical field [0001] The invention relates to the technical field of groundwater pollution control, more specifically, the invention relates to an active seepage wall filler. Background technique [0002] Groundwater is an important part of water resources and an essential and precious natural resource for human survival, life and production activities. As a fresh water resource on the earth, it has high ecological value and economic value. [0003] At present, my country's groundwater has been generally polluted to varying degrees, and the water quality in some areas has seriously exceeded the standard, and the pollution continues to increase. Especially the northern cities are more seriously polluted, with many polluting elements and a high rate of exceeding standards. The main over-standard items include minerals, fluorides, total hardness, trinitrogen, etc. Groundwater pollution in my country has shown a trend of evolving from point to surface, expanding from east t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/14C04B14/28
CPCY02W30/91
Inventor 周琪李玢黄茂开
Owner 北京至清时光环保工程技术有限公司
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