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Comprehensive remediation method for mercury-polluted rice soil

A remediation method and technology for mercury pollution, applied in the field of agricultural science, can solve the problems of single treatment measures, narrow application scope, long cycle, etc., and achieve the effects of low treatment cost, high mercury removal efficiency, and short cycle.

Inactive Publication Date: 2018-11-16
YIELEAD RICE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention provides a comprehensive restoration method for mercury-contaminated paddy soil. Aiming at the problems in the field of soil restoration such as single treatment measures, poor effect, long period, and narrow application range, physical adsorption, phytoremediation, and microbial restoration are comprehensively used. Soil remediation measures such as law to solve the pollution status of heavy metal mercury in paddy soil

Method used

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  • Comprehensive remediation method for mercury-polluted rice soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The soil pH of the paddy soil to be repaired is 5.3, brownish black soil, soil samples are collected, the Hg content is detected, and the target paddy soil is repaired according to the following method:

[0032] (1) Drain the paddy field and dry it, apply superphosphate 20g / kg to the contaminated soil, measure the soil pH every week, and proceed to the next step when the soil pH is 6.5-7.5.

[0033] (2) The 732 ion exchange resin must be activated before use. The treatment method is:

[0034] Rinse the resin column with 5 times the volume of 2% sodium hydroxide to convert the resin to the sodium form, and wash with deionized water until the effluent is nearly neutral; finally wash the resin column with 5 times the volume of 2mol / L hydrochloric acid to convert the resin It is in the hydrogen form, and it is washed with deionized water until the effluent is nearly neutral for later use.

[0035] (3) Shovel up the 40cm-thick contaminated soil on the surface of the pollute...

Embodiment 2

[0044] The soil pH of the paddy soil to be repaired is 8.2, brownish black soil, soil samples are collected, the Hg content is detected, and the target paddy soil is repaired according to the following methods:

[0045] (1) Drain the paddy field to dry, apply 20g / kg of ferrous sulfate to the contaminated soil, measure the soil pH every week, and proceed to the next step when the soil pH is 6.5-7.5.

[0046] (2) 010 ion exchange resin must be activated before use, and the treatment method is as follows:

[0047] Rinse the resin column with 5 times the volume of 2% sodium hydroxide to convert the resin to the sodium form, and wash with deionized water until the effluent is nearly neutral; finally wash the resin column with 5 times the volume of 2mol / L hydrochloric acid to convert the resin It is in the hydrogen form, and it is washed with deionized water until the effluent is nearly neutral for later use.

[0048] (3) Scoop up the 30cm-thick contaminated soil on the surface of ...

Embodiment 3

[0057] The soil pH of the paddy soil to be repaired is 7.2, brownish black soil, soil samples are collected, the Hg content is detected, and the target paddy soil is repaired according to the following method:

[0058] (1) Strong acid No. 1 ion exchange resin must be activated before use. The treatment method is as follows:

[0059] Rinse the resin column with 5 times the volume of 2% sodium hydroxide to convert the resin to the sodium form, and wash with deionized water until the effluent is nearly neutral; finally wash the resin column with 5 times the volume of 2mol / L hydrochloric acid to convert the resin It is in the hydrogen form, and it is washed with deionized water until the effluent is nearly neutral for later use.

[0060] (2) Shovel up the 50cm-thick contaminated soil on the surface of the polluted land, apply the activated strong acid No. 1 cation exchange resin according to the ratio of 4 kg per cubic soil, and mix the activated strong acid No. 1 cation exchange ...

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Abstract

The invention discloses a comprehensive remediation method for mercury-polluted rice soil. The method comprises steps of adjusting a soil PH value, adsorbing by a cation exchange resin, planting a mercury hyperaccumulation plant and utilizing a microorganism waste material. The method is capable of comprehensively using soil remediation measures of a physical adsorption method, a phytoremediationmethod, a microbial remediation method and the like, and remarkably reducing mercury content in the mercury-polluted rice soil, has the characteristics of low treatment cost, short period, high mercury removal efficiency and no secondary pollution, has the advantages of low work management strength, stable treatment effect and high performance, is suitable for improvement of a large area of the heavy metal polluted soil, and has extensive application prospect.

Description

technical field [0001] The invention relates to the field of agricultural science and technology, in particular to a comprehensive restoration method for mercury-contaminated paddy soil. Background technique [0002] Heavy metals refer to metals with a specific gravity greater than 4 or 5. There are about 45 types, such as copper, mercury, zinc, iron, cobalt, mercury, manganese, cadmium, mercury, tungsten, aluminum, gold, silver, etc. Heavy metals such as mercury, manganese, copper, and zinc are trace elements needed for life activities, but all heavy metals are toxic to the human body if they exceed a certain concentration. [0003] Mercury is a transitional metal element. The main forms of mercury in the environment are elemental mercury, inorganic mercury compounds and organic mercury compounds. The redox potential is related to the media composed of organic and inorganic substances. Usually the inorganic compounds of mercury in the soil are HgS, HgO, HgCO 3 , HgHPO 4...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/00B09C1/08B09C1/105B09C2101/00
Inventor 乔保建任代胜夏祥华付锡江陶元平彭冲
Owner YIELEAD RICE IND
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