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Cadmium copper lead polluted bottom mud curing agent and curing method thereof

A curing agent and lead pollution technology, applied in chemical instruments and methods, water pollutants, sludge treatment, 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: 2016-09-28
JIANGXI JIEDI ENVIRONMENTAL TREATMENT & ECOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Cadmium copper lead polluted bottom mud curing agent and curing method thereof
  • Cadmium copper lead polluted bottom mud curing agent and curing method thereof
  • Cadmium copper lead polluted bottom mud curing agent and curing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The bottom sludge of the downstream irrigation canal from the slag field of the Guixi Smelter in Guixi City, Jiangxi Province was used as the test sample.

[0025] The cadmium-copper-lead contaminated bottom sludge curing agent of the present invention includes alkaline materials (cement, lime and fly ash, and heavy metal fixatives (potassium dihydrogen phosphate or hydroxyapatite), and the formula composition is shown in Table 2. Add curing agent to the plastic beaker according to 10%, 15%, 20%, 30% and 40% of the weight of the bottom sludge. After stirring well, cover it with plastic wrap and incubate at a constant temperature of 25°C in a thermostat. The bottom sludge is measured after 7 days of cultivation. pH, solid waste leaching toxicity leaching method acetic acid buffer solution method (HJ / T300-2007) was used to test the leaching of heavy metals (see Table 3).

[0026] Table 1 shows the composition of the sediment samples used in the experiment.

[0027] Table 1

[00...

Embodiment 2

[0037] The cadmium-copper-lead contaminated bottom sludge curing agent of the present invention includes alkaline materials (cement, lime and fly ash), heavy metal fixatives (one of potassium dihydrogen phosphate and hydroxyapatite, and organic polymer chelating agents). 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. After proper mixing, add one of potassium dihydrogen phosphate, hydroxyapatite and sodium diethyldithiocarbamate, and stir well. After that, cover with plastic wrap and cure. After 7 days of incubation, the pH of the bottom mud was measured. The acetic acid buffer solution method (HJ / T300-2007) and solid waste leaching toxicity method (HJ-T299) were used to test the leaching capacity of heavy metals. The results are shown in the table respectively. 5 and Table 6, and use conventional acid neutralization capacit...

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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, and lead polluted bottom mud and a curing method thereof. Background technique [0002] Bottom mud is usually a mixture of clay, silt, organic matter, and various minerals. It is formed by depositing at the bottom of the water body after a long time of physical, chemical, biological, and water transport. Heavy metals discharged from industrial activities are the main source of heavy metals in the sediments, especially in the surrounding areas of some industrial and mining enterprises with intensive mining and metallurgical activities. A large number of heavy metal pollutants are discharged into the water body, causing the accumulation of heavy metals in the sediments to gradually increase. The continuous accumulation of heavy metals in the bottom mud not only poses a serious threat to the safety of aquatic organisms and the drinking w...

Claims

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Application Information

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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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