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Passivating agent for safely planting crops in medium-light chromium-polluted farmland and broadcasting method of passivating agent

A technology of passivating agent and crops, which is applied in the field of farmland soil restoration, can solve problems such as not suitable for large-scale promotion, difficult operation, complicated procedures, etc., and achieve the effect of small engineering volume, low cost and simple operation

Pending Publication Date: 2021-06-22
湖南中米环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is complicated in procedure, high in cost, difficult to operate, and not suitable for large-scale promotion.
Currently, there is no technology that is efficient, safe, low-cost, simple to operate, does not damage soil structure and fertility, and safely grows crops in chromium-contaminated farmland

Method used

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  • Passivating agent for safely planting crops in medium-light chromium-polluted farmland and broadcasting method of passivating agent
  • Passivating agent for safely planting crops in medium-light chromium-polluted farmland and broadcasting method of passivating agent
  • Passivating agent for safely planting crops in medium-light chromium-polluted farmland and broadcasting method of passivating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1: The experimental site is a 0.5 mu corn planting field around a chrome mining area in Heqiao Town, Xuyi County, Jiangsu Province. The soil pH of this place is: 4.97, and the total chromium content of heavy metals is: 201mg / kg, exceeding the "Soil Environment The risk screening value in the Quality Agricultural Land Soil Pollution Risk Control Standard (Trial) (GB 15618-2018), if corn is planted in this farmland, there is a risk of excessive chromium content in the corn produced.

[0055] 1) Screening of corn varieties: plant popular local corn varieties through local conventional cultivation and management, and screen out the relatively low accumulation of heavy metal chromium in the grains by detecting the content of heavy metal chromium in corn grains, stems, leaves, and roots (if the grains The content of chromium is the same in the root, stem and leaf of the corn variety with less heavy metal chromium content, the same below, and will not be described in...

Embodiment 2

[0065] Embodiment 2: The experimental site is in a 0.6 mu wheat planting field around a chromium mining area in Heqiao Town, Xuyi County, Jiangsu Province. The soil pH of this place is: 4.78, and the total chromium content of heavy metals is: 199mg / kg, exceeding the "Soil Environment The risk screening value in the Quality Agricultural Land Soil Pollution Risk Control Standard (Trial) (GB 15618-2018), if wheat is planted in this farmland, there is a risk of excessive chromium content in the wheat produced.

[0066] 1) Screening of wheat varieties: plant popular local wheat varieties through local conventional cultivation and management, and screen out wheat varieties with relatively low chromium enrichment in grains by detecting the chromium content in wheat grains, stems, leaves, and roots; The wheat variety in the experimental field was Huaimai 28.

[0067] 2) Plow the farmland soil before planting, the depth is: 15cm;

[0068] 3) Application of passivating agent:

[0069]...

Embodiment 3

[0076] Embodiment 3: The experimental site is in a 1.2 mu paddy field in Yisuhe Town, Xiangtan City, Hunan Province. The soil pH of this place is: 5.78, and the total chromium content of heavy metals is: 569mg / kg, which exceeds the "Soil Environmental Quality Agricultural Land Soil Pollution" According to the risk screening value in Risk Control Standards (Trial) (GB 15618-2018), if rice is planted in this farmland, there is a risk of excessive chromium content in the brown rice produced.

[0077]1) Screening of rice varieties: plant popular local rice through local conventional cultivation and management, and screen out rice varieties with relatively low chromium enrichment in brown rice by detecting the chromium content in rice brown rice, stems, leaves, and roots, and determine the experimental results. The rice variety in the field is Tanliangyou 215 (medium-maturing early rice).

[0078] 2) Plow the farmland soil before planting, the depth is: 22cm;

[0079] 3) Applicati...

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Abstract

The invention belongs to the technical field of farmland soil remediation, and particularly relates to a passivating agent for safely planting crops in a medium-light chromium-polluted farmland and a broadcasting method of the passivating agent. The passivating agent disclosed by the invention is composed of the following components in parts by weight: 10 to 20 parts of lime, 15 to 20 parts of sepiolite, 15 to 20 parts of diatomite, 5 to 10 parts of ferrous sulfate, 2 to 5 parts of sodium sulfide, 10 to 20 parts of hydroxyapatite and 10 to 30 parts of a charcoal-based microbial combination agent. The passivating agent can fully react with chromium in the soil after being applied to the surface of the soil, the effective state content of the chromium in the soil is obviously reduced, and agricultural products meeting the national food safety standard GB 2762-2012 can be planted. According to the passivating agent and the application method thereof, effective chromium in the soil is reduced, meanwhile, the soil structure cannot be damaged, the soil fertility can be improved, and the passivating agent is safe, ecological, environmentally friendly, economical, effective, low in cost, extremely high in universality and suitable for large-scale application and popularization.

Description

technical field [0001] The invention belongs to the technical field of farmland soil remediation, and in particular relates to a passivator for safely planting crops in mildly and moderately chromium-polluted farmland and a spreading method thereof. Background technique [0002] Chromium is a silver-white metal, which mainly forms chromite in nature. Chromium exists widely in nature. Its natural source is mainly from rock weathering, and most of them are trivalent; industrial wastewater is mainly composed of hexavalent chromium compounds, often in the form of chromate ions [(CrO 4 ) 2- ] The existence of trivalent chromium and hexavalent chromium are harmful to human health and have carcinogenic effects. It is generally believed that hexavalent chromium is highly toxic, more easily absorbed by the human body, and can accumulate in the body. The toxicity of hexavalent chromium is 100 times higher than that of trivalent chromium. It is a strong mutagenic substance that can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10A01B79/02A01B79/00C12N11/14C12N1/20C12R1/085C12R1/07C12R1/125C12R1/01C09K17/40
CPCB09C1/08B09C1/10A01B79/02A01B79/00C12N11/14C12N1/20C09K17/40
Inventor 袁海伟曾星胡露
Owner 湖南中米环保科技有限公司
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