Chemical washing-plant absorbing combined repair method for cadmium heavy pollution acid soil of non-ferrous metal mining area of south China

A technology of chemical leaching and combined restoration, applied in the field of heavy metal-contaminated soil treatment, can solve the problems of reducing phytoabsorption and restoration cycle, restoration cost and environmental risks, reducing leaching agent and rinsing water, and low removal rate of heavy metals, etc. Avoid the effects of low repair efficiency, low rinsing intensity, and reduced damage

Active Publication Date: 2015-06-03
江苏萤火虫环境科技有限公司
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Problems solved by technology

The invention overcomes the problem of low removal rate of heavy metals in the later stage of simple chemical leaching and the shortcoming of long period of simple plant absorption and restoration o

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  • Chemical washing-plant absorbing combined repair method for cadmium heavy pollution acid soil of non-ferrous metal mining area of south China
  • Chemical washing-plant absorbing combined repair method for cadmium heavy pollution acid soil of non-ferrous metal mining area of south China
  • Chemical washing-plant absorbing combined repair method for cadmium heavy pollution acid soil of non-ferrous metal mining area of south China

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Embodiment 1

[0023] Materials and Methods

[0024] The soils for the test were collected from the farmland around a non-ferrous metal smelting area in Zhuzhou City, Hunan Province. The soil type is red soil paddy soil, the soil is strongly acidic, and the Cd concentration is 3.12 mg kg -1 , the basic properties are shown in Table 1. The soil was dried naturally, passed through a 2mm sieve, and 15kg of soil was filled into the soil column. The inner diameter of the soil column is 30cm, the height of the soil body is 18cm, and the bulk density is about 1.18g cm -3 , Nylon mesh and filter paper are laid under the soil, a layer of filter paper is also laid above the soil, and a diversion port and a silicone tube are set at the bottom of the soil column to collect the filtrate. The soil body was infiltrated with deionized water from the bottom for a week. At room temperature, slowly pour 45L (liquid-to-soil ratio = 3) 20mmol L from above the soil column -1 FeCl 3 The eluent washes the soi...

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Abstract

The invention discloses a chemical washing-plant absorbing combined repair method for cadmium heavy pollution acid soil of a non-ferrous metal mining area of south China. The method comprises the following steps: grinding and sieving heavy metal polluted soil and filling the ground and sieved heavy metal polluted soil into an earth pillar; pouring a solution of ferric chloride into the upper part of a soil body, so that the solution flows out from the bottom of the earth pillar naturally along with the gravity, and most part of active cadmium can be removed; after a washing liquid in the upper part of the soil body completely seeps into the soil, pouring deionized water into the upper part of the soil body, so that the liquid flows out from the bottom of the earth pillar naturally along with the gravity, and residual cadmium and washing agent are removed; drying, grinding and sieving the washed soil; adding quicklime, sepiolite, a commercial organic fertilizer and the 0.2 to 1.2 g kg<-1> of total nutrient (N+P2O5+K2O) for improvement; continuously planting sedum plumbizincicola for 1 to 5 seasons, and harvesting over-ground parts to complete repair.

Description

technical field [0001] The invention relates to the treatment technology of heavy metal polluted soil, in particular to a chemical leaching-plant absorption combined restoration method for cadmium heavily polluted acidic soil in non-ferrous metal mining and metallurgy areas in southern China Background technique [0002] In recent decades, with the rapid development of industrialization and urbanization in my country, the problem of soil heavy metal pollution has become increasingly prominent. There are a large number of heavy metal heavily polluted soils around non-ferrous metal mining and metallurgy areas, among which cadmium pollution is one of the most concerned issues. Heavy metals have the characteristics of long residual time, strong concealment, and high toxicity. Heavy metals cannot be degraded by microorganisms and begin to accumulate once they enter the environment, threatening human health through dust exposure or food chain transmission. Most of the soil in so...

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 胡鹏杰吴龙华董长勋赵婕李云峰
Owner 江苏萤火虫环境科技有限公司
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