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Method for remediating soil with cadmium-arsenic combined pollution and reducing cadmium and arsenic in rice by manganese-modified rice husk charcoal

A technology of compound pollution and rice husk charcoal is applied in the field of remediation of cadmium and arsenic compound polluted soil, which can solve the problems of lack of reports and so on.

Active Publication Date: 2019-10-08
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many studies on the remediation of single heavy metal contaminated soil under flooding conditions, but there are no reports on the remediation of As-Cd complex polluted paddy soil under flooding conditions.

Method used

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  • Method for remediating soil with cadmium-arsenic combined pollution and reducing cadmium and arsenic in rice by manganese-modified rice husk charcoal
  • Method for remediating soil with cadmium-arsenic combined pollution and reducing cadmium and arsenic in rice by manganese-modified rice husk charcoal
  • Method for remediating soil with cadmium-arsenic combined pollution and reducing cadmium and arsenic in rice by manganese-modified rice husk charcoal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: Preparation of manganese modified biochar composite material

[0019] The preparation method of manganese modified rice husk charcoal composite material is as follows: weigh 5.00g of rice husk charcoal into a corundum crucible, add 40mL of -1 Potassium permanganate solution, mixed well, ultrasonicated in an ultrasonic machine at 25°C for 2h, continued to stir evenly, placed in a 95°C water bath and evaporated to dryness at a constant temperature, then pyrolyzed in a muffle furnace at 600°C for 30min without oxygen, cooled After reaching room temperature, take it out and put it in a desiccator for storage. The prepared manganese-modified rice husk carbon was weighed and calculated so that the theoretical mass ratio of manganese-modified rice husk carbon to manganese oxide was 10:1.

Embodiment 2

[0020] Embodiment 2 Rice pot experiment

[0021] Soil for test: The soil in the plow layer of 0-20cm was collected in the paddy field (N27°50′1.3″, E113°02′8.4″) of Xinma Village Experimental Demonstration Base, Majiahe Town, Zhuzhou City, Hunan Province, and its total cadmium content was 25.89mg / kg , the total arsenic content is 40.25mg / kg, which is cadmium and arsenic composite polluted soil.

[0022] Biochar for testing: manganese modified rice husk charcoal, its mesopore specific surface area is 50.2486m 2 / g, the porosity is 0.3990cm 3 / g, the pH value is 11.02, the total cadmium content is 0.12mg / kg, and the total arsenic content is 2.8mg / kg.

[0023] Three treatments were set up, namely the contaminated soil without biochar addition (CK), the contaminated soil control with rice husk charcoal (Gc) and the contaminated soil sample with manganese modified rice husk charcoal (GC-Mn). The physical and chemical properties of rice husk carbon and manganese modified biochar ...

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Abstract

The invention discloses a method for remediating soil with cadmium-arsenic combined pollution and reducing cadmium and arsenic in rice by manganese-modified rice husk charcoal. The method comprises adding weighed rice husk charcoal into a crucible, adding potassium permanganate solution, mixing well, carrying out ultrasonic treatment at a normal temperature for 2-2.5 hours, continuing to mix well,placing in a water bath pot with the temperature of 95-105 DEG C, drying by distillation at a constant temperature, carrying out anaerobic pyrolysis at 600 DEG C in a muffle furnace for 30-45 min, cooling to the room temperature to obtain the manganese-modified rice husk charcoal, weighing and calculating the prepared manganese-modified rice husk charcoal to obtain the mass ratio of the manganese-modified rice husk charcoal and a manganese oxide being 10:1, scattering the manganese-modified rice husk charcoal accounting for 0.8% of soil weight evenly into the soil under non-submerged condition, stirring well, planting rice in a conventional way, maintaining a water layer 3-5 cm in thickness on the soil, and providing maintenance and management in a conventional way. The method has the advantages that effectiveness of cadmium and arsenic in soil can be reduced significantly, less Cd and As is accumulated in rice, and the reduction effect is more significant with increase in the usage of the charcoal.

Description

technical field [0001] The invention relates to a method for repairing cadmium-arsenic compound polluted soil, in particular to a method for repairing cadmium-arsenic compound polluted soil with manganese-modified rice husk charcoal and reducing cadmium-arsenic compound polluted soil in rice. Background technique [0002] The current characteristics of heavy metal pollution at home and abroad are manifested in many cases as compound pollution formed by the simultaneous action of two or more elements. In southern my country, the problem of combined soil cadmium and arsenic pollution has become more and more serious. It has become a research hotspot in recent years to control the combined pollution of cadmium and arsenic in farmland soil and ensure the quality and safety of rice. Hunan is known as the "Hometown of Non-ferrous Metals". According to relevant survey results, the high-risk area of ​​arable land in a certain county in Hunan Province is 23.23km2 contaminated by heav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/00B09C1/105B09C2101/00
Inventor 铁柏清李园星露刘玉玲彭鸥周细红彭亮刘孝利魏祥东雷鸣杜辉辉
Owner HUNAN AGRICULTURAL UNIV