Method for treating As polluted soil

An arsenic pollution and soil technology, applied in the field of arsenic-contaminated soil treatment, can solve problems such as difficulty in treatment and remediation of arsenic-contaminated soil, weak arsenic absorption capacity, etc., and achieve good environmental benefits, small amount of engineering, investment and operating costs. low effect

Inactive Publication Date: 2003-02-19
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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  • Abstract
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Problems solved by technology

Arsenic is highly toxic to plants, and the ability of ordinary plants to absorb arsenic is generally very weak, so i

Method used

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  • Method for treating As polluted soil

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Experimental program
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Effect test

Embodiment 1

[0020] Transplant centipede grass seedlings in arsenic-contaminated soil containing 209 mg / kg of arsenic, manage them according to the management methods of common crops after the plants survive, and harvest the aboveground parts after 6 months. It was determined that the total arsenic absorbed by the upper part of the centipede meadow from the soil was 3140 mg / kg, and the arsenic content in the soil was reduced from 209 mg / kg to 177 mg / kg, which is equivalent to reducing the total arsenic in the soil by 15.0%. In the future, when the centipede grass grows for 4-5 months, the upper part of the ground will be harvested continuously, and the content of arsenic in the soil will continue to decrease, and finally the arsenic content in the polluted soil will be reduced to the arsenic level of the normal soil, so as to achieve the purpose of eliminating arsenic pollution in the soil .

Embodiment 2

[0022] From figure 1 It can be seen that after planting for 6 months, the arsenic content in the leaves increased from the original 1850mg / kg to 5070mg / kg. The aboveground part of the centipede grass contains such a large amount of arsenic. By harvesting the aboveground part, a large amount of arsenic in the soil can be taken away to achieve the effect of removing arsenic pollution.

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Abstract

A method for treating the As-polluted soil features that the Chinese brake herbs are planted in said soil for absorbing the As from the soil and the their leaves are removed periodically (5-6 months). For acid soil, the lime or alkaline fertilizer can be applied to increase its pH value.

Description

technical field [0001] The method relates to a method for controlling arsenic-contaminated soil. Background technique [0002] Arsenic pollution is a very common and very serious environmental problem. There are also large-scale arsenic pollution and arsenic poisoning problems in many mining areas and high arsenic areas in the west of my country, which have caused great harm to people's lives and industrial and agricultural production. Arsenic has been widely used in industrial and agricultural production since the 19th century. Arsenic-containing substances are often used as insecticides, fungicides, herbicides, defoliants, andricides, preservatives, paints, softeners, raw materials for chemical and semiconductor production, etc., making many orchards, farmland, material processing plants and The soil near the factory is seriously polluted by arsenic, some of which are thousands of times higher than the arsenic content of natural soil. Long-term exposure to arsenic-conta...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 陈同斌韦朝阳
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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