Method for hindering control over farmland soil heavy metal

A heavy metal and soil technology, applied in the restoration of polluted soil and other directions, can solve the problems of not involving the full cycle of food crop growth, multi-technology combination, hindering the absorption of heavy metals by plants, etc., so as to reduce soil heavy metal cadmium activity and reduce heavy metal activity. , Good effect of heavy metal resistance and control

Inactive Publication Date: 2018-02-23
HEBEI YUHUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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Problems solved by technology

[0003] There are already domestic patent applications for farmland heavy metal pollution control, for example: application number CN201610159101.2 (a method for repairing heavy metal-contaminated soil), application number CN201610131202.9 (method for preventing and controlling heavy metals in farmland soil), application number CN201410117999.8 (A heavy metal passivator and its method and use for purifying farmland), application number CN201310550331.8 (a method for repairing heavy metal-contaminated soil), application number CN2

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  • Method for hindering control over farmland soil heavy metal

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Embodiment 1

[0029] The soil in Jiyuan City, Henan Province was the soil for the test, and the cadmium content in the soil was about 1.1mg / kg. Such as figure 1 As shown, the soil was loosened and crushed with a rotary tiller, and the soil conditioner was added by manual spreading. The depth is about 0-20cm, so that the color of the paved conditioner and soil can be kept uniform after mixing. After 1 week of static equilibrium reaction, use a sowing machine to sow and plant low-accumulation wheat "Ai Kang 58" at a row spacing of 25-30cm and a plant spacing of 10-12cm. level of field irrigation. During the wheat growth and heading stage, Na is weighed per mu 2 SeO 3 4.38g, add 50L of water to dilute evenly, and the spraying frequency of the barrier agent is once every half a month for 2 months. Harvest wheat and complete remediation of soil heavy metal pollution. The treatment method is: planting low-accumulation wheat + soil conditioner + heavy metal inhibitor.

[0030] In the above...

Embodiment 2

[0034] The soil in Chenzhou City, Hunan Province was used as the test soil, and the cadmium content in the soil was about 0.78mg / kg. Such as figure 1 As shown, the soil was loosened and crushed with a rotary tiller, and the soil conditioner was added by manual spreading. The depth is about 0-20cm, so that the color of the paved conditioner and soil can be kept uniform after mixing. After 1 week of static equilibrium reaction, use a planting machine to sow and plant low-accumulation rice "Fengyou No. 9" according to the row spacing of 20-25cm and the plant spacing of 15-20cm, and weeding in the field about 15 days after planting, and timely during the entire growth period of the rice. Field irrigation or drainage measures. During the rice growth and heading stage, Na is weighed per mu 2 SeO 3 4.38g, add 50L of water to dilute evenly, and the frequency of spraying the barrier agent is once every half a month for 1 month. Harvesting rice and completing the remediation of so...

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Abstract

The invention provides a method for hindering control over farmland soil heavy metal and belongs to the technical field of farmland heavy metal pollution treatment. The method comprises the steps thatbefore seeding, a soil conditioner is added into soil and uniformly mixed through ploughed fallow; heavy metal low-accumulated crops are planted, and farmland management measures are implemented; andafter grains are formed, a heavy metal hindering agent is sprayed, and after the crops are harvested, hindering control over heavy metal pollution is completed. The raw material of the conditioner comprises the main components of 20-30% of red mud, 20-30% of rape straw powder, 5-15% of dolomite powder, 25-35% of lime powder, 20-30% of a calcium-silicon-potash fertilizer and 1-10% of amino acid. The main component of the hindering agent is Na2SeO3, wherein the Se content is 40 mg/L. According to the method for hindering control over the farmland soil heavy metal, the three-stage measures thatthe soil conditioner passivates the heavy metal, the low-accumulating crops hinder the heavy metal, and a hindering agent conducts hindering control over the heavy metal, the soil heavy metal, cadmium, is hindered from entering agricultural products, the soil cadmium activity is lowered, and guarantee is better achieved compared with one single hindering control measure.

Description

technical field [0001] The invention belongs to the technical field of heavy metal pollution control, and in particular relates to a method for preventing and controlling heavy metals in farmland soil. Background technique [0002] With the rapid development of industry and agriculture, the problem of soil pollution has become increasingly prominent, especially the problem of heavy metal pollution in soil. In 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources jointly issued the first "National Soil Pollution Survey Bulletin". The communiqué pointed out that the total point exceeding standard rate of soil in the country is 16.1%, among which the point exceeding standard rate of heavy metal pollution in cultivated land is 19.4%, and the point exceeding standard rate of cadmium is as high as 7.0%. In my country, the annual reduction in grain production due to heavy metal pollution exceeds 10 million tons, and the amount of grain polluted by h...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/08B09C1/105B09C2101/00
Inventor 候月卿孟庆来佟雪娇刘晓东张军张猛张玉荣
Owner HEBEI YUHUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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