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Environmentally-friendly eluent for treating heavy metal contaminated soil and sludge

An environmentally friendly technology for polluted soil, applied in the restoration of polluted soil, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of insufficient absorption capacity of heavy metals, improve the complexation effect, and increase the surface tension , the effect of simple operation

Inactive Publication Date: 2010-11-17
JIANGSU JIANGDA ECOLOGICAL SCI & TECHCO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But not all biosurfactants have the ability to wash heavy metal-contaminated soil, and their ability to absorb heavy metals is inferior to that of inorganic acids and artificial chelating agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one: an environment-friendly leaching agent for treating heavy metal-contaminated soil and sludge, its components are calculated in parts by weight, comprising the following process steps:

[0029] Stir 15 parts of gluconic acid, 12 parts of sodium chloride, 0.3 parts of sodium dodecyl sulfonate, 2 parts of sodium carboxymethylcellulose and 965 parts of water in a mixing tank at 45 °C, the stirring speed It is 180 rpm, and the stirring time is 60 minutes.

[0030] Lead and cadmium are typical heavy metal pollutants, which will cause great harm to the environment. Take 10 grams of simulated polluted soil sample, the lead content is 1048ppm, the cadmium content is 95ppm, add 200mL eluent solution, and stir for 1h. Suction filtration, test results show that the lead content in the sample is reduced to 125ppm, the cadmium content is reduced to 3ppm, and the elution rates are all higher than 88%.

Embodiment 2

[0031] Embodiment two: an environment-friendly leaching agent for treating heavy metal-contaminated soil and sludge, its components are calculated in parts by weight, comprising the following process steps:

[0032] Stir 20 parts of gluconic acid, 17 parts of sodium chloride, 1 part of sodium dodecyl sulfonate, 2.7 parts of sodium carboxymethylcellulose and 970 parts of water in a mixing tank at 55 ° C, the stirring speed 200 rev / min, stirring time is 30 minutes.

[0033] Add 50kg of contaminated soil into a 500L reactor, with a lead content of 1048ppm and a cadmium content of 95ppm, add 200L of eluent solution, and stir for 1 hour. After filtering, mud samples were taken and tested after drying. The results showed that the lead content was 188ppm, the cadmium content was 8ppm, and the elution rates were all higher than 80%.

Embodiment 3

[0034] Embodiment three: an environment-friendly leaching agent for treating heavy metal-contaminated soil and sludge, its components are calculated in parts by weight, comprising the following process steps:

[0035] Stir 18 parts of gluconic acid, 15 parts of sodium chloride, 0.6 parts of sodium dodecyl sulfonate, 2.4 parts of sodium carboxymethylcellulose and 968 parts of water in a mixing tank at 50°C, the stirring speed It is 190 rpm, and the stirring time is 45 minutes.

[0036] Sampling was carried out in the 50,000 m3 sludge drying tank, and the lead content was 1189ppm, and the cadmium content was 37ppm. Polyacrylamide was used as the flocculant for sludge drying, and the washing agent and flocculant were injected at the same time, and the gluconate was obtained by sampling and analysis. The ion concentration is 0.034mol / L. Heavy metals are removed while flocculating, and the solution flows into the reservoir from the water pipe to enrich and separate heavy metals. ...

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Abstract

The invention relates to an environmentally-friendly eluent for treating heavy metal contaminated soil and heavy metal contaminated sludge, which is characterized by comprising the following components in part by weight: 15 to 20 parts of gluconic acid, 12 to 17 parts of sodium chloride, 0.3 to 1 part of sodium dodecyl sulfate, 2 to 2.7 parts of sodium carboxymethylcellulose and 965 to 970 parts of water. The environmentally-friendly eluent is prepared by the following process of: stirring the components in a mixing tank of 45 to 55 DEG C at the stirring speed of 180 to 200 revolutions per minute for 30 to 60 minutes. The environmentally-friendly eluent has the advantages that: the gluconic acid can play a good role in desorbing most of heavy metals in the soil, separating the desorbed heavy metals from the soil and making the separated heavy metals enter a liquid phase, and is an environmentally-friendly substance so as not to cause secondary pollution to the environment; the sodium dodecyl sulfate can improve the surface tension of solution and the complexing effect of the eluent; the sodium carboxymethylcellulose can capture heavy metal ions in the eluent and can be combined with the heavy metals to break the micelle forms of the heavy metals so as to achieve the effect of enriching the heavy metals; and the eluent has the characteristics of simple operation, low cost and wide application.

Description

technical field [0001] The invention relates to an environment-friendly leaching agent for treating heavy metal polluted soil and sludge, and belongs to the field of restoration of heavy metal polluted soil and sludge. Background technique [0002] Heavy metals are widely used in modern industries, such as electroplating, printing and dyeing, and catalytic industries. However, if it is not properly managed and disposed of, it will cause serious environmental pollution and social nuisance. Heavy metal pollution is universal, irreversible and enriching, known as the contemporary "chemical time bomb". Heavy metals can exist stably in the environment, cannot be decomposed, and are difficult to be reduced. Some can be combined with organic matter to form organic heavy metal compounds, which are absorbed by plants, and some seep into groundwater, and then enter the food chain, enriching at a high multiple in the human body, causing serious harm to the human body. [0003] At pr...

Claims

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Application Information

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IPC IPC(8): C02F11/00B09C1/08
Inventor 屠亮陈洪龄吕志刚
Owner JIANGSU JIANGDA ECOLOGICAL SCI & TECHCO
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