A method for activator synergistic nitrogen-fixing cyanobacteria to remediate cadmium pollution in rice field soil

A nitrogen-fixing cyanobacteria and activator technology, applied in the field of heavy metal remediation in paddy field soil, can solve the problems of inability to apply paddy field remediation, and uncertainty about the harm of microorganisms and animals to rice, so as to reduce pollution and the destruction of biodiversity, and reduce soil pollution. risk, the effect of strong adsorption capacity

Active Publication Date: 2021-12-24
JIANGXI THERMAL POWER CONSTR CORP
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  • Application Information

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Problems solved by technology

Among the microbial remediation and animal remediation technologies in bioremediation, the harm of microorganisms and animals to rice is still uncertain, and cannot be applied to large-scale rice field restoration

Method used

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  • A method for activator synergistic nitrogen-fixing cyanobacteria to remediate cadmium pollution in rice field soil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]A cadmium-contaminated paddy field in Jiangxi Province was selected as the experimental field. The average concentration of cadmium in the soil was 1.2 mg / kg, and the soil pH was 6.01.

[0041] Rice: Wuyou 369, a variety commonly used in double-cropping rice growing areas in Central China, was selected.

[0042] Compound plant source activator: The raw material is collected from the peel waste of navel oranges in a fruit processing factory in Jiangxi. Crush and mix navel orange peel waste and water in a blender at a mass ratio of 1:2, filter, add glutamic acid N,N-diacetic acid (GLDA, 47wt%) solution to the filtrate, citrus fruit peel The volume ratio of the extract to GLDA is 300:1, and the resulting mixture is a heavy metal activator.

[0043] Nitrogen-fixing cyanobacteria: Nitrogen-fixing Anabaena ( Anabaena azotica HB686), Anabaena variabilis ( Anabaenavariabilis HB1058) and Anabaena cocciformis ( Anabaena sphaerica HB1017) hybrid. The algal species come from...

Embodiment 2

[0056] Experimental field: A cadmium-contaminated paddy field in Jiangxi Province was used as an experimental field. The average concentration of cadmium in the soil was 2.8mg / kg, and the soil pH was 6.4.

[0057] Rice: Wuyou 369, a variety commonly used in double-cropping rice growing areas in Central China, was selected.

[0058] Compound plant source activator: the raw material is collected from the peel waste of navel oranges in a fruit processing factory in Jiangxi. Crush and mix navel orange peel waste and water in a blender at a mass ratio of 1:1, filter, add glutamic acid N,N-diacetic acid (GLDA, 47wt%) solution, citrus fruit peel The volume ratio of the extract to GLDA is 250:1, and the resulting mixture is a heavy metal activator.

[0059] Nitrogen-fixing cyanobacteria: Nitrogen-fixing Anabaena ( Anabaena azotica HB686), Anabaena variabilis ( Anabaenavariabilis HB1058) and Anabaena cocciformis ( Anabaena sphaerica HB1017) hybrid. The algal species come from t...

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Abstract

A method of the present invention for repairing cadmium pollution in paddy field soil with activators and nitrogen-fixing cyanobacteria uses a compound plant source activator to activate heavy metal cadmium in paddy field soil, then irrigates to establish a paddy field water layer, and plows evenly to promote the activated cadmium in the soil The heavy metal cadmium migrates and dissolves into the water layer of the paddy field, and then inoculates nitrogen-fixing cyanobacteria to absorb the heavy metal cadmium that migrates and dissolves. By collecting nitrogen-fixing cyanobacteria, the cadmium content in the paddy field soil is reduced. Among them, the application amount of each compound plant source activator in the paddy field soil is 0.02-1.00mL / g paddy field soil, the height of the paddy field water layer is 8-10cm, and the inoculation dose of nitrogen-fixing cyanobacteria per mu is 40-50kg of fresh algae or dry algae Powder 2.5‑3.0kg. Compared with the existing paddy field soil restoration technology, the invention has low cost, good effect, no land occupation, no secondary pollution, achieves the effect of safe production while repairing paddy field soil, and provides a new way for paddy field soil heavy metal treatment.

Description

technical field [0001] The invention relates to a method for repairing cadmium pollution in paddy field soil with activator and nitrogen-fixing blue-green algae, and specifically belongs to the technical field of paddy field soil heavy metal restoration. Background technique [0002] In the past 30 years, with the acceleration of my country's industrialization process and the rapid development of social economy, the problems of farmland soil pollution and quality decline have become increasingly prominent. According to the 2014 "National Soil Pollution Survey Bulletin", the quality of my country's arable land soil environment is worrying, and the rate of points exceeding the standard is 19.4%, of which the rate of cadmium points exceeding the standard is as high as 7%. According to statistics, soil heavy metal pollution in China reduces grain production by more than 10 million tons every year, and pollutes up to 12 million tons of grain, among which the problem of "cadmium r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/105B09C2101/00
Inventor 沈银武王卉君刘青周鑫高凯王艳松
Owner JIANGXI THERMAL POWER CONSTR CORP
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