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Compound rice straw substrate for promoting phytoremediation on cadmium polluted soil and preparation method and application thereof

A cadmium-contaminated soil and phytoremediation technology, which is applied in the field of rice straw composite matrix and its preparation, can solve the problems of environmental secondary pollution and damage, and achieve the effects of improving soil properties, high survival rate, good pertinence and plasticity

Active Publication Date: 2017-08-04
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional methods are mainly foreign soil, application of soil amendments and screening of high stress tolerance or enrichment plants, etc., but these work will be greatly limited in practical application and cause secondary pollution and damage to the environment

Method used

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  • Compound rice straw substrate for promoting phytoremediation on cadmium polluted soil and preparation method and application thereof
  • Compound rice straw substrate for promoting phytoremediation on cadmium polluted soil and preparation method and application thereof

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preparation example Construction

[0045] The present invention also provides a method for preparing a rice straw composite substrate for promoting phytoremediation on cadmium-contaminated soil, including the following steps:

[0046] Step 1. Raw material pretreatment:

[0047] Step 1.1. Rice straw crushing and classification: collect the dried rice straw, crush it in a straw crusher first, and then automatically siev the crushed straw particles with a 5-mesh screen; the straw particles below 5 mesh are used as Straw is a decomposed raw material. The matrix particles with a small particle size are easy to decompose. After being decomposed, it is more conducive to the growth of plants. It is also easier to degrade into the soil and increase the organic matter content of the soil. Straw particles above 5 mesh are used as the growth of rice straw. The fiber is used in the upper layer of the substrate blanket, which mainly increases the porosity of the upper substrate, which is conducive to the water retention and venti...

Embodiment 1

[0064] A rice straw composite matrix that promotes phytoremediation of cadmium contaminated soil, such as figure 1 As shown, the substrate includes a substrate upper layer 1, a substrate lower layer 2 is disposed under the substrate upper layer 1, and a seed layer 3 is disposed in the substrate upper layer 1.

[0065] The composite matrix was dried and compressed into a 45cm×100cm strip with a thickness of 15cm. The upper matrix 1 was 10cm thick, and the lower matrix was 5cm thick. A seed layer 3 was added at 2cm of the upper matrix 1.

[0066] Among them, the substrate upper layer 1 consists of 65 parts of decomposed rice straw substrate particles, 14.5 parts of long rice straw fibers, 10 parts of decomposed animal manure (chicken manure or cow manure), 8 parts of slow-release regular micro-fertilizer, and 0.5 parts of plant rhizosphere bacterial fertilizer , 2 parts of degradable polymer adhesive are mixed in proportion;

[0067] The lower layer of the substrate 2 is 93.2 parts of...

Embodiment 2

[0085] A rice straw composite matrix that promotes phytoremediation of cadmium contaminated soil, such as figure 1 As shown, the substrate includes a substrate upper layer 1, a substrate lower layer 2 is disposed under the substrate upper layer 1, and a seed layer 3 is disposed in the substrate upper layer 1.

[0086] The composite matrix is ​​dried and compressed into a 45cm×100cm strip with a thickness of 8cm, wherein the upper layer of the matrix is ​​5cm thick and the lower layer of the matrix is ​​3cm thick.

[0087] Among them, the substrate upper layer 1 is composed of the following components according to mass parts: 55 parts of decomposed rice straw matrix particles, 20 parts of rice straw long fibers, 10 parts of decomposed animal manure, 10 parts of nitrogen, phosphorus and potassium compound fertilizer, 1 part of plant rhizosphere bacterial fertilizer , 3 parts of degradable polymer adhesive. The upper layer 1 of the substrate is mainly to provide a carrier and nutriti...

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Abstract

The invention discloses a compound rice straw substrate for promoting phytoremediation on cadmium polluted soil and a preparation method and application thereof. The compound rice straw substrate comprises an upper substrate layer and a lower substrate layer, wherein the upper substrate layer is prepared from 55-65 parts of composted rice straw substrate particles, 10-20 parts of rice straw long fiber, 5-10 parts of composted animal waste, 5-10 parts of nitrogen phosphorus and potassium compound fertilizer, 0.5-1 part of plant rhizosphere fertilizer and 1-3 parts of biodegradable polymer adhesion agent, and the lower substrate layer is prepared from 85-95 parts of composted rice straw substrate particles, 3-5 parts release agent coated soil chelating agent, 0.5-1 part of soil yeast powder and 1-3 parts of biodegradable polymer adhesion agent. The survival rate of the plants restored by the composite substrate is higher, the growth speed is higher, the survival time is longer, and accordingly the phytoremediation efficiency is improved.

Description

Technical field [0001] The application belongs to the technical field of soil remediation, and specifically relates to a rice straw composite substrate for promoting phytoremediation on cadmium-contaminated soil, and a preparation method and application thereof. Background technique [0002] my country is a large agricultural country with abundant rice resources, and the distribution of rice in the country is relatively extensive. The annual output of agricultural and forestry organic wastes such as straws in my country has reached more than 800 million tons, of which rice straw accounts for about 27.5%, and the annual output of rice husks has reached more than 36 million tons. The utilization rate of abundant rice straw resources in my country It's very low. Most of the straw is burned back into the field in the field or on the field, which not only causes a serious waste of resources, but also brings very serious environmental pollution and social and economic problems. At pre...

Claims

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Application Information

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IPC IPC(8): A01B79/02A01G9/10
CPCA01B79/02B09C1/00
Inventor 陈珂黄仁华阮莉萍陆云梅成新艳
Owner SOUTHWEAT UNIV OF SCI & TECH
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