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Method for repairing heavy metal pollution tailings with charcoal-based slow release fertilizer and imperata cylindrica

A biochar and slow-release fertilizer technology, applied in the restoration of polluted soil, biofuels, chemical instruments and methods, etc., can solve the problem of little research on the effect, and achieve low planting difficulty, low production cost, promotion of growth and high efficiency. The effect of absorption of heavy metal elements

Inactive Publication Date: 2017-05-24
HUATIAN ENG & TECH CORP MCC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the environment of heavy metal-polluted tailings wasteland, there are not many studies on the effect of biochar and pioneer plants on the synergistic treatment of heavy metal-contaminated soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, a method for biochar-based slow-release fertilizer to cooperate with Imperata imperata to repair heavy metal-polluted tailings comprises the following steps:

[0027] (1) Mix 1-5 parts by mass of biochar, 100 parts by mass of polyurethane emulsion with a concentration of 40%-50%, 5-10 parts by mass of starch and 150-300 parts by mass of distilled water to prepare a coating liquid;

[0028] (2) suspending 40 to 60 parts by mass of the compound organic fertilizer particles in 10 to 20 parts by mass of the coating solution prepared in step (1), and performing slow-release coating treatment to obtain a biochar-based slow-release fertilizer;

[0029] (3) the biochar-based slow-release fertilizer prepared in step (2) is mixed with heavy metal polluted tailings;

[0030] (4) Planting Imperata imperata in the heavy metal tailings mixed with biochar-based slow-release fertilizer in step (3).

[0031]Mix and stir 1-5 parts by mass of biochar, 100 parts by mas...

Embodiment 2

[0034] Based on embodiment 1, the preparation of biochar in step (1) described in this embodiment comprises the following steps:

[0035] (1) Collect straw or forest trees and use salt water to wash and crush them;

[0036] (2) Mix crushed straw or forest trees with potassium hydroxide under anaerobic conditions, and pyrolyze and carbonize them at 300° C. to 700° C. for 4 to 8 hours to obtain biochar loaded with potassium.

[0037] In this example, potassium hydroxide reacts with carbon dioxide to generate potassium carbonate; potassium hydroxide is added during the process of pyrolysis carbonization to prepare biochar, because biochar is rich in micropores, the prepared biochar is loaded with potassium element; Potassium is also loaded in the biochar-based slow-release fertilizer; potassium promotes the growth and photosynthesis of Imperata Imperatae, and improves the efficiency of Imperata Imperatae to absorb heavy metal ions.

Embodiment 3

[0039] Based on Example 1, this example also includes a step after the step (3): mixing earthworm culture medium into the heavy metal-polluted tailings containing biochar-based slow-release fertilizer and throwing in age-appropriate earthworms.

[0040] Earthworms can secrete a special enzyme that can decompose protein, fat and wood fiber, so domestic garbage, activated sludge and food industry waste in the soil can be swallowed and decomposed; at the same time, earthworms can also absorb mercury, lead and cadmium in the soil Heavy metal pollutants are also enriched in the earthworms, and after a period of time, the earthworms are taken out to make the heavy metals accumulated in the earthworms out of the ecological environment.

[0041] At the same time, earthworms can loosen soil, increase soil organic matter and improve soil structure, and promote acid or alkaline soil to become neutral soil.

[0042] In this example, earthworms were added on the basis of biochar-based slow...

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Abstract

The invention discloses a method for repairing heavy metal pollution tailings with charcoal-based slow release fertilizer and imperata cylindrica. The method includes the following steps that according to the mass ratio, 1-5 parts of charcoal, 100 parts of polyurethane emulsion with the concentration being 40%-50%, 5-10 parts of starch and 150-300 parts of distilled water are mixed to prepare a coating solution; 40-60 parts of composite organic fertilizer particles are suspended into 10-20 parts of the prepared coating solution, and slow release coating treatment is conducted to obtain the charcoal-based slow release fertilizer; the prepared charcoal-based slow release fertilizer is mixed with the heavy metal pollution tailings; and the imperata cylindrica is planted into the tailings containing the charcoal-based slow release fertilizer. By the adoption of the method, the treating effect of the heavy metal pollution tailings is good, the method is environmentally friendly, cost is low, and pollution is small; and heavy metal pollution is reduced, and meanwhile cycling utilization of recourses and lasting effect playing of fertilizer nutrients can be achieved.

Description

technical field [0001] The invention relates to a method for repairing tailings polluted by heavy metals with biochar-based slow-release fertilizer and imperina imperata. Background technique [0002] Mineral resources are non-renewable resources that human beings rely on for survival, providing us with a rich material basis. During the mining process of metal mines, after mechanical crushing and grinding, the valuable minerals are screened, and the solid residue waste discharged is tailings. According to statistics, the total reserves of tailings in my country are about 8 billion tons, and it is growing rapidly at a rate of 10% every year. Under the action of natural weathering, rainwater flushing and biological factors, long-term exposed tailings release harmful heavy metal elements, toxic residual flotation agents and acid wastewater caused by sulfur-containing minerals in waste rocks, which have a negative impact on the soil and surface water around the mining area. An...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10B01J20/20B01J20/30C10B53/02
CPCB01J20/20B09C1/08B09C1/105C10B53/02Y02E50/10
Inventor 李明詹茂华程寒飞项萌王浩冉景朱巧红夏溢
Owner HUATIAN ENG & TECH CORP MCC
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