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Cadmium-reducing selenium-enriched organic fertilizer for crops as well as preparation method and application thereof

An organic fertilizer and selenium-enriched technology, applied in the field of agricultural production, can solve the problems of long period of phytoremediation, difficult to apply in a large area, poor cadmium stability, etc., and achieve the effects of inhibiting absorption, increasing the content of organic matter, and reducing the effect of cadmium.

Active Publication Date: 2017-05-10
CHANGSHA HAORUI BIOLOGICAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is to use the physical adsorption capacity of active adsorption materials to fix cadmium in water, such as activated carbon, but these materials are expensive and difficult to apply in large areas. At the same time, physical adsorption is a relatively weak force. relatively poor sex
The third is phytoremediation, which eliminates cadmium pollution in soil through the special ability of some plants to accumulate cadmium, but such plants are not suitable for planting in all soils, and the period of phytoremediation is very long

Method used

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  • Cadmium-reducing selenium-enriched organic fertilizer for crops as well as preparation method and application thereof
  • Cadmium-reducing selenium-enriched organic fertilizer for crops as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In the fermentation tank, the plant residues composed of camellia seed meal, oil waste clay, camellia seed hulls and tea residues were mixed uniformly in a weight ratio of 50: 8: 20 to prepare a mixture, and the mixture was sprayed with 5 grams of sodium selenite. / Kg of aqueous solution. After stirring, the water content of the mixture is measured to be 55%; the mixture is piled into 1.5~2 meters high and 2~3 meters wide for composting and fermentation, when the temperature rises to 60~65℃ Turning and throwing equipment is used for the first turning treatment; the temperature of the mixture to be turned has dropped to room temperature and then stacked again. When the temperature rises to 60~65℃, the stack will be turned over again, and the sodium selenite aqueous solution should be sprayed to ensure the content of the mixture. The water content is 50-60%. After repeating this process for 6 times, the temperature of the pile body will drop to room temperature and no longe...

Embodiment 2

[0043] In the fermentation tank, the plant residues composed of camellia seed meal, oil waste clay, camellia leaves and camellia flowers are mixed uniformly in a weight ratio of 48:7:18 to prepare a mixture, and the mixture is sprayed with sodium selenite content of 8 g / The water content of the mixture is 58% after stirring evenly. The mixture is piled into 1.5~2 meters high and 2~3 meters wide for composting and fermentation. When the temperature rises to 60~65℃ Use turning and throwing equipment for the first turning treatment; the temperature of the mixture to be turned down to room temperature is re-stacked, and when the temperature rises to 60-65℃, turning the stack again, and spraying sodium selenite aqueous solution to ensure the water content of the mixture After repeating this process at 50-60% for 7 times, the stack temperature drops to room temperature and no longer rises. The fermentation process is over; the mixture after the fermentation process is stacked into st...

Embodiment 3

[0045] In the fermentation tank, the plant residues composed of camellia seed meal, oil waste clay, tea trees and tea residues are mixed uniformly in a weight ratio of 55:8:25 to prepare a mixture, and the mixture is sprayed with sodium selenite content of 6 g / The water content of the mixture is measured to be 60% after mixing evenly with kilograms of aqueous solution; the mixture is stacked into 1.5-2m high and 2-3m wide strips for composting and fermentation, when the temperature rises to 60-65℃ Use turning and throwing equipment for the first turning treatment; the temperature of the mixture to be turned down to room temperature is re-stacked, and when the temperature rises to 60-65℃, turning the stack again, and spraying sodium selenite aqueous solution to ensure the water content of the mixture At 50-60%, after repeating this process for 10 times, the stack temperature drops to room temperature and no longer rises. The fermentation process ends; the mixture after the ferme...

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Abstract

The invention relates to the technical field of agricultural production, and in particular relates to a cadmium-reducing selenium-enriched organic fertilizer applied to treatment and remediation of heavy metal pollution of soil and a preparation method thereof. According to the invention, a way that chemical adsorption of tea polyphenol and functional groups of humic acid, which are contained in camellia seed meal and theaceae plant residual bodies on cadmium and physical adsorption of oil waste clay and medical stone on cadmium are combined is uniquely adopted for greatly lowering the content of available cadmium in soil, and a selenium-containing compound and especially a means that selenized protein can form a cadmium-selenium-protein complex are adopted, so that an obvious cadmium reducing effect is achieved; and absorption of plants on cadmium is inhibited by utilizing the characteristic that selenium has a competitive antagonistic effect on cadmium and providing a large amount of selenium elements, and migration and enrichment of a cadmium element towards plants are stopped. The organic fertilizer provided by the invention has the advantages that raw materials are available, the cost is low, production processing wastes are utilized and changed into things of value, and the preparation method is simple, environment-friendly and easy to realize industrialized large-scale production.

Description

Technical field [0001] The invention relates to the technical field of agricultural production, in particular to a cadmium-reducing and selenium-enriching organic fertilizer used to treat and repair soil heavy metal pollution and a preparation method thereof. Background technique [0002] Soil pollution is called "invisible pollution" and the pollution with the longest latency. At present, soil pollution in our country is becoming more and more serious. Cultivated land, urban soil, soil around industrial bases, and industrial and mining areas are all polluted to varying degrees, and heavy metals Pollution is particularly severe, and has threatened the ecological environment, food safety and sustainable development of agriculture. Cadmium is one of the most biologically toxic elements in soil heavy metal pollution. It has strong chemical activity and long-lasting toxicity in the soil, and it is easy to harm human health through the enrichment of the food chain. According to the 2...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/80
CPCC05D1/00C05D9/00C05G3/00C05G3/80C05F5/002C05F11/00C05F17/00C05F9/04C05F11/02
Inventor 吴苏喜宋斌吴文昊
Owner CHANGSHA HAORUI BIOLOGICAL SCI & TECH
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