A kind of cadmium-copper-lead polluted sediment solidification agent and its solidification method

A curing agent and lead pollution technology, which is applied in chemical instruments and methods, sludge treatment, water pollutants, etc., can solve the problems of unsatisfactory sediment fixation effect, less consideration of sediment buffer capacity, etc., to reduce leachability , Inexpensive, Accessible Effects

Active Publication Date: 2019-06-11
JIANGXI JIEDI ENVIRONMENTAL TREATMENT & ECOLOGICAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current curing agent patents are rarely classified (Chinese Patent No. 201210464084.5, 201210506074.3), which makes certain potential risks in its application
At the same time, some curing agents are mainly composed of some alkaline materials such as cement and fly ash (Chinese Patent No. 201010242352.X). The fixed effect is difficult to meet the standard value of the domestic waste landfill pollution control standard (GB16889-2008)
In addition, some curing agents seldom consider the buffering ability of the sediment to acid after curing (Chinese Patent No. 201010594732.X, 201210506074.3), so there is a certain risk of re-release in the application

Method used

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  • A kind of cadmium-copper-lead polluted sediment solidification agent and its solidification method
  • A kind of cadmium-copper-lead polluted sediment solidification agent and its solidification method
  • A kind of cadmium-copper-lead polluted sediment solidification agent and its solidification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The bottom mud of the irrigation canal downstream of the slag field of Guixi Smelter in Guixi City, Jiangxi Province was used as the test sample, and the composition analysis results of the bottom mud samples are shown in Table 1.

[0025] The cadmium-copper-lead-contaminated bottom mud solidifying agent of the present invention, this solidifying agent comprises alkaline material (cement, lime and fly ash, and heavy metal fixing agent (potassium dihydrogen phosphate or hydroxyapatite), formula composition sees Table 2. According to 10%, 15%, 20%, 30% and 40% of the weight of the bottom mud, add curing agent to the plastic beaker, after fully stirring, cover the plastic wrap and cultivate at a constant temperature of 25°C in an incubator. Measure the bottom mud after cultivating for 7 days pH, using solid waste leaching toxicity leaching method acetic acid buffer solution method (HJ / T300-2007) to test the leachability of heavy metals (see Table 3).

[0026] Table 1 shows...

Embodiment 2

[0037] The cadmium-copper-lead-contaminated bottom mud solidifying agent of the present invention, this solidifying agent comprises alkaline material (cement, lime and fly ash), and heavy metal fixing agent (one of potassium dihydrogen phosphate and hydroxyapatite and organic macromolecular chelate Compound sodium diethyldithiocarbamate), the specific composition of the curing agent is shown in Table 4. Add cement, lime, and fly ash to the plastic beaker according to 35-43% of the weight of the bottom mud, add potassium dihydrogen phosphate, one of hydroxyapatite and sodium diethyldithiocarbamate after proper stirring, and stir well Finally, cover with plastic wrap and maintain. After cultivating for 7 days, the pH of the bottom mud was measured, and the leaching ability of heavy metals was tested by using the acetic acid buffer solution method (HJ / T300-2007) and the sulfuric acid nitric acid method (HJ-T299) of the toxic leaching method of solid waste leaching. The results ar...

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Abstract

The invention relates to a cadmium copper lead polluted bottom mud curing agent. The curing agent is characterized by being composed of alkali materials and heavy metal fixing agents. The alkali materials comprise cement, lime and coal ash; the heavy metal fixing agents comprise monopotassium phosphate or hydroxyapatite and sodium diethyl dithiocarbamate. The invention further relates to a cadmium copper lead polluted bottom mud curing method. The curing method is low in treating cost and can obviously reduce the cadmium copper lead leaching content of bottom mud. Especially, the cadmium copper lead leaching content obtained through an acetic acid buffer method (HJT300-2007) which is a solid waste leaching toxicity leaching method is obviously lower than a limit value of municipal solid waste landfill pollution controlling standard (GB16889-2008).

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a curing agent for cadmium-copper-lead polluted bottom mud and a curing method thereof. Background technique [0002] Sediment is usually a mixture of clay, silt, organic matter and various minerals, which is deposited at the bottom of the water body after long-term physical, chemical, biological, and water transport. Heavy metals discharged from industrial activities are the main source of heavy metals in sediments. Especially in the surrounding areas of industrial and mining enterprises with intensive mining and metallurgy activities, a large amount of heavy metal pollutants are discharged into water bodies, which gradually increases the accumulation of heavy metals in sediments. The continuous accumulation of heavy metals in the sediment not only poses a serious threat to the safety of drinking water for aquatic organisms and residents along the river, but may a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F101/20
CPCC02F11/008C02F2101/20C02F2209/06C02F2303/02C02F2303/08
Inventor 周典海崔红标
Owner JIANGXI JIEDI ENVIRONMENTAL TREATMENT & ECOLOGICAL TECH CO LTD
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