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Treatment method for rice field soil polluted by acid arsenic, lead and cadmium in combined mode

A technology of compound pollution and soil conditioner, applied in the field of soil heavy metal pollution control, can solve the problems of strong spatial heterogeneity, lack of field test evaluation of in-situ passivation, and high risk of soil heavy metal pollution, so as to reduce biologically effective sexual effect

Pending Publication Date: 2022-07-01
有研资源环境技术研究院(北京)有限公司
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AI Technical Summary

Problems solved by technology

[0004] Excessive heavy metal content in edible parts of crops not only depends on the total amount and effective content of heavy metals in the soil, but also is affected by soil properties, fertilizer types, crop types, water conditions, and farming systems. Traditional soil heavy metal pollution prevention and control technologies are in In the actual application process of heavy metal-contaminated soil in farmland, there are some problems: (1) heavy metal-contaminated farmland covers a wide area, there are many types of heavy metal pollution, pollution causes are different, pollution is unevenly distributed, soil composition is complex, and spatial heterogeneity is strong, etc. It is difficult to complete large-scale farmland restoration with a single technology, such as single deep plowing, in-situ passivation or safety conditioning, micro-fertilizer regulation, leaf resistance control, water management, etc., and there is a lack of integrated application research on various technologies (2) Conventional in-situ passivation lacks extensive field test evaluation, the application effect is not stable enough, and the application method needs to be improved. The passivation effect of farmland soil is not ideal, and the cheapness, availability and environmental friendliness of the material itself are often ignored; (3) due to the long-term application of conventional single fertilizers such as nitrogen, phosphorus and potassium fertilizers to farmland soil, some elements that are beneficial to the soil are not Supplements are absorbed by crops, and the applied fertilizer itself may bring in heavy metals or have an activation effect on heavy metals, resulting in a high risk of heavy metal pollution in the soil; (4) Leaf barrier technology mainly sprays certain nutrients on the leaves of crops ( blocker) to promote the resistance of the crop itself to heavy metals, and restrict the main control heavy metals from entering the edible part through competition, but there is a lack of extensive field test evaluation on the blocker products, and the joint control of heavy metals by foliar barrier technology and passivation technology The effect still needs to be verified; (5) The actual remediation effect of water management and other agronomic control measures combined with other technologies needs to be verified. For example, in the flooded state, the soil cadmium activity decreases, and the risk of arsenic release may increase. For arsenic, lead , cadmium compound polluted farmland integrated technology research and development and large-scale application reliability verification still need to be strengthened

Method used

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  • Treatment method for rice field soil polluted by acid arsenic, lead and cadmium in combined mode
  • Treatment method for rice field soil polluted by acid arsenic, lead and cadmium in combined mode
  • Treatment method for rice field soil polluted by acid arsenic, lead and cadmium in combined mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The As-Pb-Cd composite contaminated soil of a paddy field in the south was taken. After analysis, the soil sample contained 1.86 mg / kg of cadmium, 89.41 mg / kg of lead, and 111.37 mg / kg of arsenic.

[0031] The soil conditioner used contains 20% of dolomite powder, 20% of limestone powder, 40% of light-burned heavy magnesium oxide, 10% of sodium bentonite, 5% of sodium silicate, 2% of peat soil, and 3% of humic acid. About 11.26, the soil conditioner is mainly composed of Si-Ca-Mg composite materials.

[0032] The micro-fertilizer used is iron fertilizer (20 mesh, FeSO 4 content ≥ 98%).

[0033] The trade name of the foliar blocker used is Mircon Cadmium Ling, which belongs to Si-based nutrient solution (Si≥120g / L, Weifang Letuoshou Biological Engineering Co., Ltd.). When applying, follow the product directions. The foliar barrier agent containing Si can not only maintain or even increase the yield, but also form precipitation with heavy metals.

[0034]Before the ri...

Embodiment 2

[0040] The As-Pb-Cd composite contaminated soil of a paddy field in the south was taken. After analysis, the soil sample contained 1.86 mg / kg of cadmium, 89.41 mg / kg of lead, and 111.37 mg / kg of arsenic.

[0041] The soil conditioner used contains 25% of dolomite powder, 15% of limestone powder, 35% of light-burned heavy magnesium oxide, 15% of sodium bentonite, 5% of sodium silicate, 2% of peat soil, and 3% of humic acid. About 10.17.

[0042] The micro-fertilizer used is zinc fertilizer (20 mesh, ZnSO 4 ·H 2 O content ≥ 95%).

[0043] The trade name of the foliar barrier agent used is Bell Shell, which belongs to the nutrient solution containing Zn and Mn (iron + manganese + copper + zinc + boron ≥ 130g / L, Bell Shell Bioengineering (Hubei) Co., Ltd.). When applying, follow the product directions. Foliar blockers containing Zn and Mn mainly compete with heavy metals for the transport channel of cadmium, thereby inhibiting the flow of heavy metals.

[0044] Before the ric...

Embodiment 3

[0050] The As-Pb-Cd composite contaminated soil of a paddy field in the south was taken. After analysis, the soil sample contained 0.85 mg / kg of cadmium, 46.55 mg / kg of lead, and 55.48 mg / kg of arsenic.

[0051] The soil conditioner used mainly includes 20% dolomite powder, 40% limestone powder, 25% light-burned heavy magnesium oxide, 5% sodium bentonite, 5% sodium silicate, 2% peat soil, and 3% humic acid. pH about 10.17;

[0052] The micro-fertilizer used is iron fertilizer (20 mesh, FeSO 4 content ≥ 98%);

[0053] The foliar barrier agent used is a foliar barrier and control agent with the trade name, which belongs to Si-based nutrient solution (Si≥80g / L, Na≤78g / L, Environmental Protection Bridge (Hunan) Eco-Environmental Engineering Co., Ltd.). When applying, follow the product directions.

[0054] Before the rice is planted, water is released in the field. After 3 days of drying, the soil conditioner is applied to the soil at a rate of 300kg / mu and mixed with a rotary ...

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Abstract

The invention belongs to the field of soil heavy metal pollution treatment, and particularly relates to a treatment method for rice field soil subjected to acid arsenic, lead and cadmium combined pollution. According to the treatment method, a certain amount of soil conditioner is added into the farmland soil containing arsenic, lead and cadmium combined pollution, ploughing and uniform mixing are conducted, the effects of adsorption, precipitation and the like are mainly generated on heavy metal, and the mobility of the heavy metal in the soil is reduced. Then, microelement fertilizer regulation and control are conducted on the soil, and the soil fertility is improved while microelement fertilizer with the passivation effect is applied. Thirdly, a leaf surface blocking agent is sprayed, and the mobility of the heavy metal to edible parts in the crop body is reduced. And finally performing water management to further reduce the activity of the heavy metals. The treatment method is suitable for safe utilization and risk management and control of the acidic soil of the moderately and mildly polluted rice field, and has the advantages of simple technical operation, abundant input raw material resources, low price, high heavy metal blocking efficiency, short remediation period, capability of treating various heavy metals at the same time, low secondary risk to the environment and the like.

Description

technical field [0001] The invention belongs to the field of soil heavy metal pollution control, relates to a control method for paddy field soil, and in particular relates to a control method for rice field soil compound polluted by acid arsenic, lead and cadmium. Background technique [0002] The problem of excessive heavy metals in agricultural products is related to the national economy and people's livelihood, and realizing the safe utilization and risk control of heavy metal-contaminated farmland is an important way to ensure food security. Therefore, according to the characteristics of heavy metal polluted farmland in my country, it is particularly important to carry out the application research of the combined technology system of safe utilization. At present, the technical modes of safe utilization of farmland mainly include plant extraction, soil safety conditioning or passivation, deep ploughing, physical dilution, planting structure adjustment, and agronomic regu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/08B09C1/105B09C2101/00
Inventor 于冰冰袁学韬陈勃伟刘兴宇张明江王建雷徐政刘美林高博文
Owner 有研资源环境技术研究院(北京)有限公司
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