Curing agent for remediation of lead-contaminated soil, preparation method of curing agent and application of curing agent

A lead-contaminated soil and curing agent technology, applied in the field of soil remediation, can solve the problems of slow growth, long growth cycle, and short growth of hyperaccumulative plants, achieve excellent strength and water resistance, improve strength and water resistance, and inhibit leaching with the effect of migration

Inactive Publication Date: 2017-02-22
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, phytoremediation is recognized as an ideal in-situ soil treatment technology, but there are obvious disadvantages: hyperaccumulative plants are often short in size, low in biomass, slow in growth, and long in growth cycle; phytoremediation is affected by soil type, temperature, and humidity. environmental constraints such as nutrition and
[0004] However, the current solidification stabilization method is suitable for soils that are not seriously polluted, and the restoration cost is low, so there is a certain application space
Moreover, this repair method cannot completely eradicate the lead element on the soil surface, and the repair effect has a certain temporary nature.

Method used

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Examples

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preparation example Construction

[0027] The present invention also provides a preparation method for a curing agent for lead-contaminated soil remediation, comprising the following steps:

[0028] Step 1. Weighing: Weigh the following components by weight: 4 to 5 parts of cement, 2 to 3 parts of fly ash, and 1 to 2 parts of desulfurized gypsum;

[0029] Step 2. Mix the weighed components uniformly to prepare a curing agent powder for remediation of lead-contaminated soil.

[0030] The invention provides a kind of curing agent for the restoration of lead-contaminated soil and its application in the restoration of lead-contaminated soil, comprising the following steps:

[0031] Step 1. Pretreatment of lead-contaminated soil: excavate the soil that needs to be repaired with a lead mass content of 0.1%-1.5%, and the excavation depth is 40-50cm, and transfer the soil to a special site for soil restoration;

[0032] Step 2. Prepare a curing agent for lead-contaminated soil remediation: mix 4 to 5 parts of cement, ...

Embodiment 1

[0035] A repair method for lead-contaminated soil, which comprises the following steps:

[0036] A. Treatment of lead-contaminated soil

[0037] First, excavate the soil that needs to be repaired with a lead content of 0.1%, and the excavation depth is 35cm, and transfer the soil to a special site for soil restoration;

[0038] B. Preparation of curing agent

[0039] Mix 10 parts of Portland cement, 6 parts of fly ash and 4 parts of desulfurized gypsum evenly to obtain curing agent powder;

[0040] C, curing repair

[0041] First, mix the solidifying agent powder prepared in step B with 100 parts of lead-contaminated soil evenly, then gradually add water to make it fully mixed with the soil; then add water until the moisture content reaches 20-30%, and after 5 days, the restoration is completed; finally Safely landfill the remediated lead-contaminated soil. Before the lead-contaminated soil is mixed with the curing agent powder, the lead-contaminated soil is crushed, sieve...

Embodiment 2

[0043] A repair method for lead-contaminated soil, which comprises the following steps:

[0044] A. Treatment of lead-contaminated soil

[0045] First, excavate the soil that needs to be repaired with a lead content of 0.5%, and the excavation depth is 35cm, and transfer the soil to a special site for soil restoration;

[0046]B. Preparation of curing agent

[0047] Mix 10 parts of Portland cement, 6 parts of fly ash and 4 parts of desulfurized gypsum evenly to obtain curing agent powder;

[0048] C, curing repair

[0049] First, mix the solidifying agent powder prepared in step B with 100 parts of lead-contaminated soil evenly, then gradually add water to make it fully mixed with the soil; then add water until the moisture content reaches 20-30%, and after 5 days, the restoration is completed; finally Safely landfill the remediated lead-contaminated soil. Before the lead-contaminated soil is mixed with the curing agent powder, the lead-contaminated soil is crushed, sieved...

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PUM

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Abstract

The invention discloses a curing agent for the remediation of lead-contaminated soils, a preparation method of the curing agent and application of the curing agent. The curing agent is prepared from, by weight, 4-5 parts of cement, 2-3 parts of fly ash and 1-2 parts of desulfurized gypsum. The ratio of the mass of lead contaminated soils to the total mass of cement, fly ash and desulfurized gypsum is 15-20 to 100. The curing agent for the remediation of the lead-contaminated soils is simple, scientific and reasonable in matching of raw materials; the raw materials are mostly industrial solid waste, fly ash and the like, and conform to the national environmental protection policy. According to the curing agent, not only the waste is used to treat the waste, but also stabilized soils in a stable layer are high in compressive strength, and the water stability is excellent.

Description

technical field [0001] The application belongs to the field of soil remediation, and in particular relates to a curing agent for remediation of lead-contaminated soil, its preparation method and application. Background technique [0002] With the rapid development of industry and agriculture in our country, soil heavy metal pollution has become the focus of attention. Among them, lead-contaminated soil is more serious. Lead-containing soil not only affects soil microorganisms, enzyme activity, and physical and chemical properties, but also pollutes surface water and groundwater twice, and endangers human health through the food chain. The main causes of soil lead pollution are coal burning, industrial lead and vehicle exhaust. [0003] The remediation methods of lead-contaminated soil mainly include solidification stabilization method, phytoremediation and chemical extraction. Among them, phytoremediation is recognized as an ideal in-situ soil treatment technology, but the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/10B09C1/08
CPCC09K17/10B09C1/08
Inventor 王强刘祎宫保聚孟燕
Owner ANHUI UNIV OF SCI & TECH
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