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Compound soil repair agent, preparation method and repairing method thereof

A technology of soil remediation agent and composite material, which is applied in the field of remediation of heavy metal pollution to soil and vegetable fields, composite soil remediation agent and its preparation, can solve the problems of poor remediation effect and large dosage, achieve uniform shape, regulate heavy metal transmission, The effect of reducing the cumulative concentration of heavy metals

Active Publication Date: 2019-10-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of large dosage and poor restoration effect of the existing single soil restoration agent, the present invention provides a composite soil restoration agent and its preparation method and restoration method

Method used

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  • Compound soil repair agent, preparation method and repairing method thereof
  • Compound soil repair agent, preparation method and repairing method thereof
  • Compound soil repair agent, preparation method and repairing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Raw material: poplar wood-based biochar: Wuhan Guanggu Lanyan New Energy Co., Ltd., with a specific surface area of ​​28.9317m 2 / g, the total carbon is 785.8g / kg, and the total nitrogen is 34.85g / kg.

[0034] A preparation method of a composite soil repair agent, comprising the following steps:

[0035] (a) Preparation of hydroxyapatite-calcium silicate composite material:

[0036] Dissolve 6g of calcium chloride in 60ml of water to obtain a calcium chloride solution;

[0037] 5g of sodium silicate was dissolved in 50ml of water to obtain sodium silicate solution;

[0038] The resulting calcium chloride solution was slowly added dropwise to the sodium silicate solution under ultrasonic conditions, resulting in a white sol that gradually hardened and was sampled, taken out and incubated in a plastic container at room temperature for 24 hours. In order to remove free calcium hydroxide, wash and filter with deionized water after the reaction, and finally dry at 80°C fo...

Embodiment 2

[0044] A method for compound soil remediation agent to repair complex heavy metal polluted soil, comprising the following steps:

[0045] (1) Collection of compound heavy metal polluted soil:

[0046] The test soil was collected from Hunan Agricultural University. The compound heavy metal-contaminated soil was prepared by artificially adding cadmium solution, copper solution, lead solution, and zinc solution. The forms of lead and zinc tend to be stable. The total copper content in the soil was measured by the graphite furnace digestion method to be 293.5mg / kg, the total cadmium content was 3.05mg / kg, the total lead content was 1195.6mg / kg, and the total zinc content was 724mg / kg;

[0047] (2) Remediation of complex heavy metal contaminated soil:

[0048] Prepare five groups of the same weight, stabilized compound heavy metal-contaminated soil, wherein, the first group does not add any repair agent, as a blank control group; the second group adds 3% hydroxyapatite-silicic ac...

Embodiment 3

[0063] Since water spinach is a common edible vegetable in southern my country, an annual plant with strong adaptability and low planting cost, water spinach is selected as the research object in this embodiment. The soil remediation agent can also be used to improve other vegetables in the heavy metal polluted vegetable field.

[0064] A kind of compound soil remediation agent repairs the method for the spinach that soil is polluted by compound heavy metal, comprises the following steps:

[0065] (1) Collection of compound heavy metal polluted soil:

[0066] The test soil was collected from Hunan Agricultural University. The compound heavy metal-contaminated soil was prepared by artificially adding cadmium solution, copper solution, lead solution, and zinc solution. The forms of lead and zinc tend to be stable. The total copper content in the soil was measured by the graphite furnace digestion method to be 210.5mg / kg, the total cadmium content was 1.6mg / kg, the total lead c...

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Abstract

The invention discloses a compound soil repair agent, a preparation method and a repairing method thereof. The repair agent is composed of a hydroxyapatite-calcium silicate composite material and biochar, the mass ratio of the hydroxyapatite-calcium silicate composite material and the biochar is 4 to 6-9 to 1, and the biochar is poplar base biochar. The preparation method comprises the steps thatdispersion liquid of calcium chloride and dispersion liquid of sodium silicate are correspondingly prepared firstly, then a calcium chloride solution is dropwise added into a sodium silicate solutionunder ultrasonic to react, washing by deionized water and filtering are conducted after reaction is completed, calcium silicate hydrate precipitation is obtained and added into a phosphate solution toreact, the hydroxyapatite-calcium silicate composite material is obtained after filtering, and then the biochar is mixed with the composite material according to the mass ratio to obtain the soil repair agent. According to the compound repair agent, when the ratio of the hydroxyapatite-calcium silicate composite material and the biochar is 4 to 6, mutual promotion between the materials is achieved, the synergistic effect is generated, the long-term and high efficient repair effect can be achieved for heavy composite metal contaminated soil, the cost is low, the using amount is small, and environmental protection is achieved.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a composite soil remediation agent using hydroxyapatite-calcium silicate composite materials in cooperation with biochar, a preparation method thereof, and a method for remediating heavy metal pollution to soil and vegetable fields. Background technique [0002] Soil is the material basis for human survival and development, and the basic means of production for agricultural production. However, with the continuous deepening of urbanization and industrialization, human activities such as mineral resource development, metal smelting, sewage irrigation, and extensive use of chemical fertilizers have caused pollutants containing various heavy metals to enter the soil through various channels, resulting in soil heavy metal pollution. Soil heavy metal pollution is concealed, long-term and irreversible. It stays in the soil for a long time and cannot be degraded by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08B09C1/08C09K101/00
CPCB09C1/08B09C2101/00C09K17/08C09K2101/00
Inventor 袁兴中陈鸿鹄蒋龙波熊婷姚赛杨羽茜彭叶琼
Owner HUNAN UNIV
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