Natural regulating agent for treating heavy metal polluted farmland soil and preparation method thereof

A technology of heavy metals and regulators, applied in soil conditioning materials, chemical instruments and methods, applications, etc., can solve the problems of difficult to repair high-concentration polluted soil, long repair time of biological repair measures, high cost of physical repair measures, etc., to achieve waste Recycling, improving the ability to hold and fix, and reducing the risk of migration

Active Publication Date: 2014-02-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of high cost of physical remediation measures, destruction of soil structure, secondary pollution, long repair time of biological remediation measures, and difficulty in repairing high-concentration polluted soil, etc., to provide a kind of material with wide sources of raw materials and stable heavy metal passivation effect The formulation and preparation method of heavy metal pollution regulators for farmland, which can also increase the income of agricultural products, have no secondary pollution, and are environmentally friendly, can be widely used in the in-situ restoration of heavy metal-contaminated farmland soil, increase crop yields, and reduce the consumption of heavy metals in agricultural products. risk

Method used

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  • Natural regulating agent for treating heavy metal polluted farmland soil and preparation method thereof
  • Natural regulating agent for treating heavy metal polluted farmland soil and preparation method thereof
  • Natural regulating agent for treating heavy metal polluted farmland soil and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The invention is a regulating agent for heavy metal polluted farmland soil, the active ingredients of which are tea waste and potassium humate, and the specific preparation steps are as follows:

[0033] (1) Take tea garden residues (such as litter, fruit shells and cores, etc.); secondary tea produced during tea processing (thick old stalk leaves and tea ash, etc., accounting for about 10% of the total output of finished tea); tea leaves Tea waste such as tea dregs produced after deep processing or drinking should be dried in the sun for later use;

[0034] (2) Take materials rich in humic acid such as sludge, peat or decomposed compost products from domestic sewage treatment plants, remove gravel, grass roots and other debris, air dry and grind them, and pass them through a 5-mesh sieve (4mm sieve size) for later use;

[0035] (3) Add 0.5 mol / L KOH to the material obtained in step (2) according to the mass volume ratio of 1:2, shake intermittently for 4 hours, filter ...

Embodiment 2

[0039] The invention is a regulating agent for heavy metal polluted farmland soil, the active ingredients of which are tea waste and potassium humate, and the specific preparation steps are as follows:

[0040] (1) Take tea garden residues (such as litter, fruit shells and cores, etc.); secondary tea produced during tea processing (thick old stalk leaves and tea ash, etc., accounting for about 10% of the total output of finished tea); tea leaves Tea waste such as tea dregs produced after deep processing or drinking should be dried in the sun for later use;

[0041] (2) Take materials rich in humic acid such as sludge, peat or decomposed compost products from domestic sewage treatment plants, remove gravel, grass roots and other debris, air dry and grind them, and pass them through a 5-mesh sieve (4mm sieve size) for later use;

[0042] (3) Add 0.5 mol / L KOH to the material obtained in step (2) according to the mass volume ratio of 1:2, shake intermittently for 4 hours, filter ...

Embodiment 3

[0046] Effects of regulators on soil lead and cadmium forms

[0047] Agricultural soil in Fuyang City, Zhejiang Province, pH 5.2, organic matter content 1.6%, high soil acidity, low nutrient retention capacity, high mobility of heavy metals in the soil, and high bioavailability. Take an appropriate amount of the soil, air-dry it, grind it finely, and pass it through a 2mm sieve for later use. 0.05%, 0.10% and 0.20% of the dry weight of the soil sample were added with the regulator obtained in Example 1 of the present invention and mixed evenly. Each treatment was repeated 3 times and placed in an artificial climate chamber for cultivation. Water regularly to keep the soil moist, and take samples to analyze the chemical forms of lead and cadmium in the soil after one month. The morphological analysis adopts the BCR three-step extraction method proposed by the European Union Bureau of Standards. This method divides the forms of heavy metals in soil into water-soluble state, ex...

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Abstract

The invention relates to a natural regulating agent for treating heavy metal polluted farmland soil and a preparation method thereof. The natural regulating agent comprises tea waste and potassium humate. The preparation method comprises the following steps of firstly, drying tea waste in the sun and reserving for standby application; secondly, removing impurities of the material rich in humic acid, air drying and grinding, sieving by a 5-mesh sieve and reserving for standby application; then adding KOH (potassium hydroxide) into the material rich in humic acid, oscillating intermittently, filtering by filter cloth, and obtaining potassium humate; finally, uniformly mixing the tea waste and potassium humate, grinding, sieving by a 5-mesh sieve, thereby obtaining the natural regulating agent for heavy metal polluted farmland soil. The natural regulating agent comprises tea waste and potassium humate which are rich in functional groups for adsorbing and fixing heavy metals, such as phenolic hydroxyl group and carboxyl, thus being capable of effectively adsorbing various active heavy metals in the farmland soil.

Description

technical field [0001] The invention relates to a regulating agent for improving soil and restoring farmland heavy metal pollution and a preparation method thereof. More specifically, it is a soil conditioner and a preparation method thereof, which is used to improve soil, control heavy metal pollution, and increase crop production and income by adding tea waste such as tea leaves and tea dregs, supplemented by potassium humate. Background technique [0002] Heavy metal pollution is one of the most widespread and harmful environmental problems today. According to statistics, my country's heavy metal-contaminated soil currently exceeds 300 million mu, and the annual food pollution caused by excessive heavy metals in arable land is as high as 12 million tons, and the direct economic loss exceeds 20 billion yuan. Toxic and harmful heavy metals in soil not only degrade soil quality and affect the safety of agricultural products, but also pollute surface water and groundwater th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/32C05G3/04C09K101/00C05G3/80
Inventor 施积炎段德超何俊昱于明革王毅
Owner ZHEJIANG UNIV
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