CN-121988598-A - Restoration method for heavy metal soil or ore pile

Abstract

The invention belongs to the technical field of soil remediation, and particularly relates to a remediation method of heavy metal soil or ore piles, which comprises the steps of crushing the heavy metal soil or ore piles, adding compressed straw, gypsum, volcanic rock and steel slag for smoldering, and respectively carrying out anaerobic fermentation and aerobic fermentation until remediation is completed after the smoldering is completed. Compared with the prior art, the invention provides a hydraulic-powered screw propeller for crushing, material injection, punching and the like, so that the repairing process is more convenient, meanwhile, the heavy metal soil or ore pile is injected with compressed straw, gypsum, volcanic rock and steel slag and then smoldered, and after the smoldering is finished, anaerobic fermentation and aerobic fermentation are respectively carried out, so that the removal rate of heavy metal in the heavy metal soil or ore pile can be improved, and meanwhile, the added substances can not bring other secondary pollution to the heavy metal soil or ore pile.

Inventors

• WANG LEI
• WANG YANGYANG
• LI SHAOFENG
• WANG XIAOSHU
• LIU JIN
• WANG JINSHENG

Assignees

• 深圳职业技术大学

Dates

Publication Date

20260508

Application Date

20251105

Priority Date

20241105

Claims (10)

1. 1. The method for repairing the heavy metal soil or ore pile is characterized by comprising the following steps of: S100, crushing the heavy metal soil or ore pile, ditching and ridging the crushed heavy metal soil or ore pile, and then adding compressed straw, gypsum, volcanic rocks and steel slag into the heavy metal soil or ore pile; S200, transversely drilling holes in the heavy metal soil or ore pile, filling an ignition agent in the transverse holes, then igniting the heavy metal soil or ore pile for smoldering, and covering the surface of the heavy metal soil or ore pile with a ceramic fiber fireproof blanket; s300, cooling after smoldering, adding dehydrated sludge, livestock and poultry manure and vinasse into heavy metal soil or ore piles, and then fermenting; and S400, after fermentation is completed, introducing oxygen into the heavy metal soil or ore heap, and then performing aerobic fermentation until repair is completed.
2. 2. The method for repairing heavy metal soil or ore heap according to claim 1, wherein the crushing of heavy metal soil or ore heap and the adding of materials are completed by a hydraulic screw propeller.
3. 3. A method for remediation of heavy metal soil or ore heap according to claim 2 wherein in step S100: the volume ratio of the compressed straw to the heavy metal soil or ore heap is 1:2-1:1.
4. 4. A method of remediation of heavy metal soils or ore piles according to claim 3, wherein in step S100: the adding proportion of the gypsum, the volcanic rock and the steel slag is 1:1:2-1:1:1, and the total volume of the gypsum, the volcanic rock and the steel slag is 5-10% of the total volume of the compressed straw and the heavy metal soil or ore heap after mixing.
5. 5. A method for remediation of heavy metal soil or ore pile according to claim 4 wherein in step S200 the bore diameter of the transverse bore is 20cm and the transverse bore is completed by a hydraulically powered screw.
6. 6. The method for restoring heavy metal soil or ore heap according to claim 5, wherein in said step S200: the filled ignition agent is uncompressed straw leaves and straw fermentation crude alcohol with the concentration of 3-9%, and the smoldering time is 24 hours.
7. 7. The method for remediation of heavy metal soil or ore heap according to claim 6 wherein in step S300: the mixing ratio of the dewatered sludge, the livestock manure and the vinasse is 1:1:1-5:1:1, and the fermentation is carried out for 5-15d.
8. 8. The method for remediation of heavy metal soil or ore heap according to claim 7 wherein in step S300: The total volume of the dehydrated sludge, the livestock manure and the vinasse is 15-35% of the total volume of the heavy metal soil or the ore heap.
9. 9. The method for remediation of heavy metal soil or ore heap according to claim 8 wherein in step S300: the livestock manure is one or more of pig manure, cow manure and sheep manure.
10. 10. The method for remediation of heavy metal soil or ore heap according to claim 9, wherein in step S400: the time of the aerobic fermentation is 15-30d.

Description

Restoration method for heavy metal soil or ore pile Technical Field The invention belongs to the technical field of soil remediation, and particularly relates to a remediation method of heavy metal soil or ore heap. Background Soil remediation is a technical measure to restore normal functions of contaminated soil, and at present, soil remediation technology is widely applied to various contaminated sites, including industrial areas, agricultural lands, residential areas and the like. The original functions of the soil can be effectively treated and restored by the restoration technology, and the threats to the ecological environment, food safety and human health are reduced. At present, the original functions of the soil can be effectively treated and restored by physical, chemical or biological methods, so that the threats to the ecological environment, food safety and human health are reduced. Specifically, the physical methods include heat treatment, excavation, and the like. Chemical methods include chemical leaching, chemical oxidation, and the like. Biological methods include the use of in situ microbial repair techniques and ex situ microbial repair techniques. However, the current soil remediation still has the problems of poor remediation effect, large engineering quantity, high investment, reduced soil fertility, secondary pollution risk and the like. Such as soil replacement, soil dressing, etc., requires a large amount of earthworks, which requires not only a large amount of time and labor, but also a high investment. Although heavy metals can be effectively removed by deep ploughing, soil replacement and the like, the original structure and biodiversity of the soil can be damaged, so that the soil fertility is reduced, the growth of crops is affected, meanwhile, pollutants such as dust, waste liquid and the like can be generated in the treatment process by the physical repair method, and secondary pollution can be caused if the pollutants are improperly treated. In addition, although the chemical restoration method takes effect quickly, new chemical substances can be introduced, so that secondary pollution is caused. If improperly selected or used in excess, it may have a negative impact on soil and crops. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a method for repairing heavy metal soil or ore heap so as to solve the technical problems mentioned in the background art. In order to achieve the above purpose, the present invention provides the following technical solutions: a method for repairing heavy metal soil or ore pile comprises the following steps: S100, crushing the heavy metal soil or ore pile, ditching and ridging the crushed heavy metal soil or ore pile, and then adding compressed straw, gypsum, volcanic rocks and steel slag into the heavy metal soil or ore pile; S200, transversely drilling holes in the heavy metal soil or ore pile, filling an ignition agent in the transverse holes, then igniting the heavy metal soil or ore pile for smoldering, and covering the surface of the heavy metal soil or ore pile with a ceramic fiber fireproof blanket; s300, cooling after smoldering, adding dehydrated sludge, livestock and poultry manure and vinasse into heavy metal soil or ore piles, and then fermenting; and S400, after fermentation is completed, introducing oxygen into the heavy metal soil or ore heap, and then performing aerobic fermentation until repair is completed. Preferably, the crushing of heavy metal soil or ore heap and the addition of material are all accomplished by hydraulically powered augers. Preferably, in said step S100: the volume ratio of the compressed straw to the heavy metal soil or ore heap is 1:2-1:1. Preferably, in said step S100: the adding proportion of the gypsum, the volcanic rock and the steel slag is 1:1:2-1:1:1, and the total volume of the gypsum, the volcanic rock and the steel slag is 5-10% of the total volume of the compressed straw and the heavy metal soil or ore heap after mixing. Preferably, in said step S200, the transverse bore has a bore diameter of 20cm and the transverse bore is completed by means of a hydraulically powered screw. Preferably, in said step S200: the filled ignition agent is uncompressed straw leaves and straw fermentation crude alcohol with the concentration of 3-9%, and the smoldering time is 24 hours. Preferably, in said step S300: the mixing ratio of the dewatered sludge, the livestock manure and the vinasse is 1:1:1-5:1:1, and the fermentation is carried out for 5-15d. Preferably, in said step S300: The total volume of the dehydrated sludge, the livestock manure and the vinasse is 15-35% of the total volume of the heavy metal soil or the ore heap. Preferably, in said step S300: the livestock manure is one or more of pig manure, cow manure and sheep manure. Preferably, in said step S400: the time of the aerobic fermentation is 15-30d. Compared with the prior art, the