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Preparation method of composite biomass improver for remedying heavy metal-polluted soil

A technology for polluting soil and biomass, which is applied in the field of preparation of composite biomass modifiers, can solve problems such as weakened heavy metal fixation capacity, poor chemical stability, and huge biomass, and achieves strong heavy metal fixation capacity, low production cost, and high-quality preparation technology. simple effect

Active Publication Date: 2017-05-24
INST OF BIOLOGICAL RESOURCES JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, straw-like agricultural wastes lack active components such as alkaloids, amino acids, tannins, and ketones, and the physical and chemical interactions between cellulose, hemicellulose, and lignin limit the adsorption of heavy metals. Development of effective process measures to improve the heavy metal adsorption performance of straw-like agricultural waste
Furthermore, the biomass modifier is easy to degrade during the application process, has poor chemical stability, and the ability to fix heavy metals is weakened accordingly, so it is urgent to take measures to solve this problem.

Method used

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  • Preparation method of composite biomass improver for remedying heavy metal-polluted soil

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Take fresh rice straw, wash it with water, dry to constant weight, crush, sieve, and take 30-60 mesh rice straw for experiment. Mix a certain amount of rice straw with a sodium hydroxide solution with a concentration of 0.1 g / L, the amount of straw added is 20 g / L, fully react the mixed solution for 1 hour, filter it, and wash it with dilute hydrochloric acid and water until neutral. Mix and react with a solution of potassium permanganate concentration of 0.1g / L. After 2 hours of reaction, add 1.2 g / L sodium dihydrogen phosphate for cross-linking reaction. The temperature of the entire reaction system is 40°C. Rinse repeatedly until neutral. Composite with calcium salt by solution blending method, filter after the reaction is complete, rinse repeatedly with distilled water until neutral, and dry for later use. The prepared modified adsorbent and the prepared Cd-containing 2+ Solution mixing, Cd 2+ The concentration is 500mg / L, the pH value of the solution is 5.68, an...

Embodiment 2

[0022] Wash the corn stalks with water, dry them at 65°C to constant weight, crush them, sieve them, and take 30-60 mesh corn stalks for testing. Mix a certain amount of corn stalks with a sodium hydroxide solution with a concentration of 0.1 g / L. The amount of corn stalks added is 20 g / L. After fully reacting the mixed solution for 1 hour, filter it and wash it with dilute hydrochloric acid and water until neutral. Add 100mL of distilled water to the alkalized corn stalks, and then pass through ozone gas. After reacting for 15 minutes, add concentrated phosphoric acid in an amount of 0.15 mL of phosphoric acid / g corn stalks, and then place it in a water bath at 60°C for 1 hour and then filter. Rinse repeatedly with distilled water until neutral. Composite with calcium salt by solution blending method, filter after complete reaction, wash with distilled water repeatedly until neutral, dry for later use. Take the wastewater from the acidic reservoir effusion pool of a copper m...

Embodiment 3

[0024] Fresh rice straws were taken, rinsed, dried at 65°C to constant weight, crushed, sieved, and 30-60 mesh straws were taken for testing. Mix and soak a certain amount of rice straw and sodium hydroxide solution with a concentration of 0.1 g / L, the straw addition amount is 20 g / L, filter after soaking for 2 hours, wash with dilute hydrochloric acid and water until neutral. Then the alkalized rice straw was mixed with hydrogen peroxide solution, and the concentration of hydrogen peroxide was 2% (v / v). After 2 hours of reaction, 1.92 g / L disodium hydrogen phosphate was added for cross-linking reaction. After 2 hours of reaction at 25°C, the Composite with calcium salt by solution blending method, filter after complete reaction, rinse repeatedly with distilled water until neutral, dry for later use. A 16-week soil cadmium remediation test was carried out on the improver. The amount of the improver added was 5% (mass ratio). During the test period, the exchangeable Cd in the s...

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Abstract

The invention discloses a preparation method of a composite biomass improver for remedying heavy metal-polluted soil. The method comprises the following steps: with agricultural waste as a raw material, washing, drying, grinding and screening; soaking in an alkaline solution; after the soaking, washing with dilute acid or water to neutrality; oxidizing with an oxidizing agent such as ozone, hydrogen peroxide or potassium permanganate; with phosphate or phosphate ester as a crosslinking agent and distilled water as a dispersing agent, performing a phosphorylation addition reaction; filtering after complete phosphorylation addition reaction; compounding the phosphorylated biomass with calcium salt by a solution blending method; heating and stirring till complete reaction; filtering and separating out solid materials; washing with a sodium chloride solution and deionized water to neutrality; and drying to obtain a composite biomass improver. The invention has the characteristics of simple preparation method, low cost, no secondary pollution and the like and also solves two major problems of agricultural waste stacking and farmland heavy metal pollution.

Description

technical field [0001] The invention relates to a preparation method of a composite biomass modifier for repairing heavy metal polluted soil, which is used for solving the problem of soil heavy metal pollution, and belongs to the fields of material preparation and environmental engineering. Background technique [0002] With the rapid development of industry and agriculture, the problem of heavy metal pollution has become increasingly serious. The area of ​​cultivated land polluted by heavy metals in my country has reached 1 / 5. Heavy metal pollution poses a serious threat to the ecological environment and human health. There are many treatment technologies for soil heavy metal pollution, among which the in-situ remediation technology using low-cost, low-secondary-pollution biomass modifiers as heavy metal passivation materials has attracted widespread attention. Researchers at home and abroad have used a wide variety of agricultural and forestry wastes to prepare biomass mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/32C09K101/00
CPCC09K17/32C09K2101/00
Inventor 李晓晖艾仙斌吴照祥计少石孙小艳
Owner INST OF BIOLOGICAL RESOURCES JIANGXI ACAD OF SCI
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