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Granular soil conditioner for composite heavy metal pollution, and preparation method thereof

A soil conditioner and heavy metal technology, applied in the field of soil remediation, can solve the problems of increasing crop yield, quality and other added value, reducing environmental pollution, dust pollution and other problems, avoiding dust pollution and harm to human body, reducing migration and transformation, Avoid the effect of rain wash

Inactive Publication Date: 2021-08-13
河南中米生态科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (1) Most of the products are mainly aimed at acidic rice field soil, less for wheat field soil and medium alkaline (6.5≤pH≤8.5) soil suitable for both wheat field and rice field;
[0005] (2) Most of the raw materials use raw minerals, and no substances that can reduce environmental pollution after reuse or substances that can reduce environmental pollution after direct utilization are used;
[0006] (3) Most products are aimed at the remediation of single heavy metal cadmium pollution or the remediation of heavy metal cadmium and lead, but fail to remediate the three heavy metals of cadmium, lead and mercury at the same time;
[0007] (4) Most of the products only act on soil heavy metal remediation, but fail to bring nutrients to crops, increase crop yield, quality and other added value;
[0008] (5) Most of the products are in powder form, which may easily cause dust pollution or cause harm to the human body when spreading

Method used

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  • Granular soil conditioner for composite heavy metal pollution, and preparation method thereof
  • Granular soil conditioner for composite heavy metal pollution, and preparation method thereof
  • Granular soil conditioner for composite heavy metal pollution, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A kind of preparation method of the granular soil conditioner for compound heavy metal pollution such as cadmium, lead, mercury, comprises the following steps:

[0041] (1) Preparation of biochar: Take waste biomass rice husk and wheat straw as raw materials, place it in a tube furnace under the protection of nitrogen, heat up to 600°C at a rate of 10°C / min, carbonize at high temperature for 3 hours, and cool to After taking it out at room temperature, the prepared carbonized product was washed with 1mol / L HCl solution to remove ash, filtered, washed with deionized water until neutral, dried, ground into powder, and washed five times with deionized water. ℃ drying to obtain biochar.

[0042] (2) The preparation of the biochar of sodium selenite load: the sodium selenite of 0.1 weight part is fully dissolved in 100 weight parts of water and poured in the biochar of 65 weight parts of step (1) gained, in mixer After stirring at a speed of 150r / min for 0.5h, ultrasonic wa...

Embodiment 2

[0048] In a certain area of ​​Dakuai Town, Xinxiang County, Henan Province, 6 flat fields with a length of 5 meters and a width of 4 meters and an area of ​​about 36 square meters were selected for the verification test of soil conditioners. The soil in the test site was sent to Hunan Geological Testing Institute for testing , and its basic physical and chemical properties are shown in Table 1. The test set 3 treatments, each treatment was repeated 3 times, and there were 9 plots in total. A 2.5-meter-wide protection row was set up around the test area, and field ridges (20 cm in width and 30 cm in height) were set between every two plots, and covered with Plastic film to prevent water and fertilizer from different plots, and each plot is randomly arranged in blocks.

[0049] Treatment 1: blank (CK), conventional fertilization, without applying any other soil conditioner;

[0050] Process 2: the soil conditioner 150kg / mu that conventional fertilization+embodiment 1 makes (co...

Embodiment 3

[0088]In an area around Dongting Lake, Yueyang City, Hunan Province, 6 flat fields with an area of ​​5 meters long and 4 meters wide and about 36 square meters were selected for the verification test of soil conditioners. The soil in the test site was sent to Hunan Geological Testing Institute for testing , its basic physical and chemical properties are: the pH of the soil is 7.82, the total soil cadmium content is 3.14mg / kg, the total lead content is 393.5mg / kg, and the total mercury content is 1.32mg / kg. The test is set with 3 treatments, each treatment is repeated 3 times, a total of 9 small plots, 2.5 meters wide protection rows are set around the test area, and field ridges (width 20cm, height 30cm) are set between every two plots, and the field ridges are covered. Plastic film prevents water and fertilization from different plots, and each plot is randomly arranged in blocks.

[0089] Treatment 1: blank (CK), conventional fertilization, without applying any other soil co...

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Abstract

The invention relates to the technical field of soil remediation, and especially relates to a granular soil conditioner for composite heavy metal pollution, and a preparation method thereof. The granular soil conditioner is prepared from, by weight, 60-70% of biomass charcoal, 0.05-0.15% of sodium selenite, 5-10% of desulfurized gypsum, 5-10% of lignite and 15-25% of wollastonite through mixing, granulating, drying and sieving with a 10-mesh sieve. The soil conditioner disclosed by the invention can be used when various crops such as wheat fields and rice are planted, can effectively passivate cadmium, lead, mercury and the like in soil, reduces the bioavailability of the soil, and also can reduce the contents of cadmium, lead and mercury in the crops. The soil conditioner disclosed by the invention is wide in raw material source and rich in reserves, and the soil conditioner prepared by utilizing the raw materials is granular, is convenient to use, can stay in soil for a long time, avoids rain wash, and improves the stability of the efficacy of the conditioner.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a granular soil conditioner for compound heavy metal pollution and a preparation method thereof. Background technique [0002] At present, most of the conditioners developed for southern acidic soils in the market are mainly to increase the pH value, and have no effect on medium-alkaline soils; moreover, most of the registered medium-alkaline soil conditioners are used to control saline-alkaline soils and cannot passivate heavy metal. In addition, because of the difference in the soil environment of wheat fields and rice fields, the soil conditioners that are applicable to the soil of wheat fields may not be suitable for rice. In the prior art, there are few researches on the conditioners that can be applied to these two crops. For example, a Chinese patent application (application number: 201810970527.5) discloses a conditioner suitable for heavy metal cadmium pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/80C05G5/12B09C1/00B09C1/08
CPCC05G3/80C05G5/12C05D3/00B09C1/08B09C1/00B09C2101/00C05D3/02C05D9/00C05D9/02C05F11/02
Inventor 袁海伟胡露
Owner 河南中米生态科技有限公司
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