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A method for manganese-modified rice husk charcoal to remediate cadmium-arsenic compound polluted soil and reduce cadmium-arsenic in rice

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: 2021-12-03
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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  • A method for manganese-modified rice husk charcoal to remediate cadmium-arsenic compound polluted soil and reduce cadmium-arsenic in rice
  • A method for manganese-modified rice husk charcoal to remediate cadmium-arsenic compound polluted soil and reduce cadmium-arsenic in rice
  • A method for manganese-modified rice husk charcoal to remediate cadmium-arsenic compound polluted soil and reduce cadmium-arsenic in rice

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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 repairing cadmium-arsenic compound polluted soil with manganese-modified rice husk charcoal and reducing cadmium-arsenic compound pollution in rice. The method firstly weighs rice husk charcoal and puts it into a crucible, adds potassium permanganate solution, and mixes thoroughly and uniformly. Ultrasonic treatment at room temperature for 2 h-2.5 h, then continue to stir evenly, and put it in a water bath at 95°C~105°C to evaporate to dryness at a constant temperature, and then pyrolyze in a muffle furnace at 600°C for 30 min~45 min without oxygen , cooled to room temperature to obtain manganese modified rice husk carbon, then weigh and calculate the prepared manganese modified rice husk carbon, so that the mass ratio of manganese modified rice husk carbon to manganese oxide is 10:1; In the non-flooded condition, sprinkle manganese-modified rice husk charcoal equivalent to 0.8% of the soil weight into the soil and stir evenly, then plant rice according to the conventional method and keep the soil with a 3-5 cm thick water layer, and maintain it according to the conventional method Just manage. The invention can significantly reduce the availability of cadmium and arsenic in soil, and reduce the accumulation of Cd and As in rice, and the reduction effect is more significant with the increase of usage amount.

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 Patents(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