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Soil improvement agent for repairing soil Cd pollution and application of soil improvement agent

A soil conditioner and soil remediation technology, which is applied in the field of soil pollution improvement and remediation, can solve the problems of reducing soil heavy metal availability, reducing cadmium bioavailability, increasing soil pH, etc., and achieving reduced effectiveness and low price. , the effect of improving rice yield

Active Publication Date: 2018-05-15
ZHEJIANG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

At the same time, it was found that fertilization has a certain impact on the absorption of cadmium by plants. A large number of studies have shown that the addition of calcium magnesium phosphorus, calcium hydrogen phosphate and potassium dihydrogen phosphate to the soil will increase the pH of the soil, thereby reducing the bioavailability of cadmium; and for superphosphate There are few reports on the effectiveness of reducing soil heavy metals
Because the use of a single soil improver is prone to soil quality degradation, the current soil improver is mostly used in combination with two or more improvers or used in combination with fertilizers

Method used

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  • Soil improvement agent for repairing soil Cd pollution and application of soil improvement agent
  • Soil improvement agent for repairing soil Cd pollution and application of soil improvement agent
  • Soil improvement agent for repairing soil Cd pollution and application of soil improvement agent

Examples

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Effect test

Embodiment 1

[0018] Embodiment 1. A soil conditioner for remediating soil Cd pollution, which consists of the following components by weight: 47% lime, 47% zeolite, 5% superphosphate and 1% biochar.

[0019] The superphosphate is granular calcium superphosphate; the lime is powdery calcium oxide; the zeolite is powdery artificial zeolite; the preparation method of the biochar is as follows: put the bamboo into an anaerobic airtight container and heat it to 600°C for 2 hours , to get biochar.

[0020] Experiment 1. A kind of amendment is used for submerged cultivation of soil Cd pollution

[0021] The improved experiment was carried out from June 2016 to November 2016 in the laboratory of Zhejiang University Zijingang Campus in Hangzhou City, Zhejiang Province. The soil used for the test was taken from the paddy field in the west area of ​​Zijingang Campus, Zhejiang University, Hangzhou City, Zhejiang Province. The pH value of the soil was 6.52, and the total cadmium was 0.02mg kg -1 . I...

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Abstract

The invention relates to the technical field of soil contamination improvement as well as repairing and treatment and particularly discloses a soil improvement agent for repairing soil Cd pollution. The soil improvement agent comprises the following components including, by weight, 45%-49% of lime, 45%-49% of zeolite, 4%-6% of superphosphate and 0.8%-1.2% of biomass charcoal. The invention furtherdiscloses an application method of the soil improvement agent for repairing soil Cd pollution. The application method comprises the following steps of uniformly applying the soil improvement agent tosoil, wherein the additive amount of the soil improvement agent is 1.25 kg.m<-2>-5kg.m<-2>. When the soil improvement agent is applied to soil severely polluted by Cd, the effective-state content ofCd in the soil can be effectively reduced, the content of Cd in unpolished rice is lowered, and the rice yield is increased to meet the national hygienic standard of grains.

Description

technical field [0001] The invention relates to the technical field of soil pollution improvement and restoration treatment, in particular to the improvement and restoration treatment of Cd pollution in soil heavy metal pollution. Background technique [0002] With the progress of modern society, cadmium has been widely used in the nuclear industry, battery industry, electroplating industry, plastic industry, etc., and enters the soil through atmospheric deposition and human production activities, making soil Cd pollution an increasingly serious problem. At the same time, cadmium is a highly toxic pollution element, which has serious harm to human body, animals and plants, and has strong mobility and bioaccumulation. The situation of soil Cd pollution in my country is not optimistic. The 2014 "National Soil Pollution Survey Bulletin" showed that the rate of cadmium pollutants exceeding the standard reached 7.0%. From the bone pain caused by cadmium-containing wastewater irr...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/06
CPCB09C1/08C09K17/06
Inventor 张奇春蔡梅邸洪杰
Owner ZHEJIANG UNIV
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