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CN-122004001-A - Composite ecological restoration technology suitable for open pit coal mine dumping site

CN122004001ACN 122004001 ACN122004001 ACN 122004001ACN-122004001-A

Abstract

The invention discloses a composite ecological restoration technology suitable for an open pit coal mine dumping site, which comprises the steps of (I) planting water-saving and sink-increasing plants, sowing the water-saving and sink-increasing plants to the open pit coal mine dumping site to be restored in a broadcast grass seed sowing mode, (II) preparing and spraying prokaryotic microorganism strains, culturing separated and purified pseudoarthrobacterium Pseudarthrobacter sp.xwn1, microbacterium sp.xwn2 and Acinetobacter sp.xwp1, and spraying the cultured microorganism strains to the open pit coal mine dumping site after sowing. The composite ecological restoration technology promotes the carbon fixation capacity of plants, improves the organic carbon content of soil, and is beneficial to ecological carbon fixation restoration of an open pit coal mine dumping site.

Inventors

  • WANG GONGTING
  • WANG YANZHONG
  • LIU BIN
  • LU MENGNAN
  • LI SONGYAO
  • XIAN XIAOLONG
  • CAI LIYUAN
  • ZHANG PENGYI
  • ZHOU RUNLIN

Assignees

  • 国能水务环保有限公司

Dates

Publication Date
20260512
Application Date
20260112

Claims (10)

  1. 1. A composite ecological restoration technique suitable for an open pit coal mine dumping site, comprising the following restoration steps: (I) Planting water-saving and exchange-increasing plants, namely sowing the water-saving and exchange-increasing plants to an open pit coal mine dumping site to be repaired in a broadcast irrigation grass seed mode; And (II) preparing and spraying prokaryotic microorganism strains, namely culturing the separated and purified pseudoarthrobacter Pseudarthrobacter sp.xwn1, microbacterium sp.xwn2 and Acinetobacter sp.xwp1, and spraying the cultured microbial agents to a soil discharge site of an open pit coal mine after sowing after expanding culture.
  2. 2. The composite ecological restoration technology according to claim 1, wherein the water-saving and sink-increasing plant is selected from the group consisting of caragana microphylla, sabconduct, alfalfa and high-speed grass, preferably, 15-25% of caragana microphylla, 30-40% of sabconduct, 30-40% of alfalfa and 5-15% of high-speed grass in the grass seed which is sown.
  3. 3. The composite ecological restoration technology according to claim 1 or 2, further comprising (I-1) mixing the grass seed mixture and the mycorrhizal fungi agent to be sown with the grass seed mixture before planting the water-saving and sink-increasing plants, wherein the mycorrhizal fungi agent is a mycorrhizal fungi dark-colored endophyte (DSE) and Arbuscular Mycorrhizal Fungi (AMF) strain.
  4. 4. A composite ecological restoration technique according to any one of claims 1-3, further comprising (I-2) applying decomposed porous ecological soil to an open pit mine dumping site to be restored prior to planting of the water-saving and sink-increasing plants; The application amount of the decomposed porous ecological soil is 0.2-1 ton/mu, and when the soil is applied, the soil on the surface layer of the land is ploughed by 30-50 cm, the decomposed porous ecological soil is uniformly spread, and then the soil is ploughed for 20-30 cm times.
  5. 5. The composite ecological restoration technique according to claim 4, wherein the porous ecological soil is prepared by the following method: Fully mixing the background powder of the dumping site with the cementing material to form a mixture, adding water, stirring to prepare slurry, adding a foaming agent into the slurry after stirring, pouring the slurry into a mould after stirring, maintaining at constant temperature in a constant temperature maintenance box, demoulding and drying the maintained module, and finally crushing, granulating and screening the dried module to obtain a screened material with the particle size smaller than 5 mm, namely the porous ecological soil material, wherein the weight of the background powder of the dumping site is taken as the reference, the cement consumption of the cementing material is 4-6%, the water consumption is 60-65%, the aluminum powder consumption of the foaming agent is 0.03-0.06%, and the maintenance temperature is 45-55 ℃.
  6. 6. The composite ecological restoration technique according to claim 4 or 5, wherein when the porous ecological soil is decomposed, the porous granular material and the waste organic matter are mixed, and the microbial decomposition accelerator is added for fermentation, so as to obtain the decomposed porous ecological soil.
  7. 7. The complex ecological restoration technique according to any one of claims 1 to 6, wherein in the restoration step (II), the isolated and purified pseudoarthrobacter Pseudarthrobacter sp.xwn1, microbacterium sp.xwn2 and Acinetobacter Acinetobacter sp.xwp1 are cultured in an LB medium, preferably in which the yeast extract content is 3 to 5g/L, naCl content and the pancreatic protein content is 5 to 10g/L, to obtain a cultured bacterial liquid.
  8. 8. The composite ecological restoration technology according to claim 7, wherein the cultured bacterial liquid has an OD600 of more than 0.6, and is subjected to on-site expansion culture until the bacterial liquid is blackened and the smelly eggs are generated and then sprayed.
  9. 9. The composite ecological restoration technique according to any one of claims 1 to 8, wherein in the restoration step (II), the amount of the microbial inoculum of 0.5 to 2m 3 /mu is sprayed 1 to 3 times per week for 8 to 10 weeks at the time of spraying.
  10. 10. The composite ecological restoration technique according to any one of claims 1 to 9, wherein in the restoration step (I), the water-saving and sink-increasing plant is planted by sowing and irrigating the seeds in a manner of sowing, the sowing amount being 30 to 50 kg per hectare, and the sowing depth of the seeds being not more than 2 cm.

Description

Composite ecological restoration technology suitable for open pit coal mine dumping site Technical Field The invention belongs to the technical field of soil remediation, relates to a composite ecological remediation technology suitable for an open pit coal mine dumping site, and in particular relates to a composite ecological remediation technology for an open pit coal mine dumping site, which is used for water-saving carbon enrichment guiding plant configuration, promoting plant growth and improving planting layer soil and mycorrhizal fungus agent by using prokaryotic functional microbial agents and porous ecological soil. Background Along with the opening of the 'double carbon' target in 2020, the realization of carbon reaching peak and carbon neutralization becomes a wide and deep economic and social system innovation in China, and the mine ecological restoration is not only an important means for restoring the mine ecological system, but also an effective measure for enhancing the carbon sink capacity of the mining area ecological system. Carbon emission caused by mining of mineral resources, and carbon emission caused by reduction of carbon fixation capacity of soil-vegetation in mining areas due to land resource damage. Carbon sink promotion of mining land ecosystems relies primarily on vegetation restoration under natural and artificial solutions. Mining resources cause severe disturbance of the ecological environment, causing deterioration or even loss of the carbon storage capacity of the ecological system of the mining area. Through land reclamation processes such as landform remodelling, soil reconstruction, vegetation reconstruction and the like, the ecological system of the mining area is gradually changed from a carbon source to a carbon sink. The ecological carbon sink method mainly comprises the following steps of photosynthesis and photosynthetic carbon distribution of vegetation, absorption and conversion of CO 2 in the atmosphere into photosynthesis products such as polysaccharide through photosynthesis of the double green vegetation, transportation of the photosynthesis products to various tissues and organs of plants through branch and stem distribution, carbon fixation of soil, and conversion of organic matters such as animal and plant residues, litters and root secretions in the environment (mainly comprising photosynthetic carbon) into the soil through biochemical reaction under the action of microorganisms after the organic matters enter the soil, and carbon fixation of microorganisms, wherein the soil microorganisms serve as a ligament between the soil and plants and participate in all ecological processes such as nutrient circulation, litter decomposition, humus formation and the like, and play a key driving role in the processes such as synthesis, decomposition, fixation and the like of carbon. Previous researches show that the comprehensive carbon sink technology of vegetation, microorganisms and soil has the advantages of integrity, multiple directions, full ecology and the like in the field of ecological restoration of the open pit coal mine. The technology utilizes different microbial inoculants-plant combinations and associated solid waste of the open pit dumping site to carry out soil remediation of the open pit dumping site, and constructs a three-dimensional ecological carbon sink system, thereby having practical research significance. The method can better promote the recycling utilization of the associated solid wastes of the coal mine, solve the problem of insufficient local surface soil, and accelerate the vegetation recovery of the dumping site and the improvement of the ecological environment of the mining area. While updating and iterating the restoration technology, overall consideration of ecological restoration of the heap mine in aspects of a target system, a carbon emission reduction path, economic benefits and the like is needed, and by means of a gradually perfected policy system, the synergy of pollution reduction and carbon reduction is realized, and the national carbon peak reaching and carbon neutralization work is assisted. Disclosure of Invention The invention aims to provide a composite ecological restoration technology suitable for an open pit coal mine dumping site, so as to perform ecological carbon sequestration restoration of the open pit coal mine dumping site. In order to achieve the above purpose, the present invention adopts the following technical scheme: A composite ecological restoration technique suitable for an open pit coal mine dumping site, comprising the following restoration steps: (I) Planting water-saving and exchange-increasing plants, namely sowing the water-saving and exchange-increasing plants to an open pit coal mine dumping site to be repaired in a broadcast irrigation grass seed mode; And (II) preparing and spraying prokaryotic microorganism strains, namely culturing the separated and purified pseudoarthrobacter Pseudarthr