CA2953951A1 - A high-rate bioreactor system for soil remediation - Google Patents
A high-rate bioreactor system for soil remediation Download PDFInfo
- Publication number
- CA2953951A1 CA2953951A1 CA2953951A CA2953951A CA2953951A1 CA 2953951 A1 CA2953951 A1 CA 2953951A1 CA 2953951 A CA2953951 A CA 2953951A CA 2953951 A CA2953951 A CA 2953951A CA 2953951 A1 CA2953951 A1 CA 2953951A1
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- CA
- Canada
- Prior art keywords
- soil remediation
- waste water
- bioreactor
- waste
- vapor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Mycology (AREA)
- Processing Of Solid Wastes (AREA)
Description
Description of Invention for Patent Application January 06, 2017 The Name of the Inventor & Applicant: Dr. Xiaokun Victor Zhang The Address of the Inventor & Applicant: 4 Warren Street, Guelph, Ontario, Canada, N1E0A1 Telephone: 519-821-4031 Mobile: 226-500-2579 Email: vzhang@generalenvironment.com Title: A High-rate Bioreactor System for Soil remediation The present invention relates to methods for remediating soil and groundwater, in-situ or ex-situ.
For removal of the contaminants including hydrocarbons and heavy metals from soils of surface and subsurface, chemicals including surfactants, co-solvents, and other functional additives are required to solubilize and mobilize the contaminants. Generally, water containing such chemicals is pumped into the contaminated zone of soil and the mobilized contaminants are then dispersed in water and pumped out of the soil and aquifer. The collected effluent including waste water and waste vapor contains a considerably amount of hydrocarbons and/or heavy metals, which can cause secondary pollution of the environment if without proper treatment.
Physical adsorption and chemical oxidation methods can be used for disposal of the waste water and waste vapor.
However, the cost including capital investment and operating cost is high; in addition, a large amount of solid sludge is commonly produced and needs further treatment or landfill. Currently, many soil remediation systems use conventional biological wastewater treatment processes for disposal of the wastewater; however, these processes were fundamentally designed for treating easily biodegradable organic compounds and can be operated only at a comparatively low concentration and loading rate of these organic compounds. As a result, these processes are normally sensitive to loading shock due to the organic concentration increase and organic composition change, especially the appearance of difficultly biodegradable organic compounds including complex hydrocarbon. The bioreactor operating failure can cause critical problem on the performance of soil remediation and make more troubles than solving the soil contamination problem.
This application presents embodiments of an invention which include a fast and efficient methods for disposal of the waste water and waste vapor collected from treating contaminated soil and groundwater in-situ and ex-situ. The high-rate bioreactor system comprises a oil/water separator and a modulated submerged attached growth bioreactor in which biochar but not limited to other materials including plastic material, wood, gravel can be used as the carriers providing habitants for microorganisms to grow. In this innovatively designed bioreactor, the carriers are contained in modules so that the microorganisms are maintained to prevent from loss due to high hydraulic fluid shear happening in the reactor. In this way, the microorganism residence time (MRT) can be separated from the waste water/waste vapor residence time in the bioreactor and thus the MRT
can be controlled at the required length to achieve high number of the microorganisms. Thus, a biological system of the balanced ecological structure is developed for a harmonized syntrophic biological food web system, which involves various synergistically functioning heterotrophs and autotrophs for effective biological removal of carbon, nitrogen, phosphorus from the waste water and vapor. As a result, the developed microbial system can have stronger resistance to organic loading shock and much more efficient to degrade hydrocarbons of low biodegradability. In addition, the aqueous phase of the bioreactor is well mixed due to the air or waste vapor provided to the bioreactor. Consequently, the waste water and vapor are uniformly distributed into the bioreactor and provide good dilution of waste water and vapor in the bioreactor to further reduce the organic loading shock. Furthermore, the biochar material has vast surface area for strong and efficient adsorbing of heavy metals and hydrocarbons from the waste water and waste vapor for a longer-term decomposition in the bioreactor.
This application also represents a method to recover, recycle and reuse the treated waste water for soil remediation. According to the method, the waste water collected from an in-situ soil remediation well or ex-situ soil pile is first pumped into the oil/water separator to recovery hydrocarbon as oil and the cleaned aqueous phase is then pumped into the bioreactor for biological treatment. After the treatment, the water with or without addition of more functional additives is pumped back to the well be used as the washing liquid for soil remediation. In this way, the water usage for soil remediation is minimized. In addition, due to the long MRT, the solids production is minimized for sludge treatment.
This application also represents a method to recover, recycle and reuse the treated waste water for soil remediation under aerobic and anaerobic conditions. Due to the composition and concentration of the organic contaminants in the waste water as well as the treatment targets,
For removal of the contaminants including hydrocarbons and heavy metals from soils of surface and subsurface, chemicals including surfactants, co-solvents, and other functional additives are required to solubilize and mobilize the contaminants. Generally, water containing such chemicals is pumped into the contaminated zone of soil and the mobilized contaminants are then dispersed in water and pumped out of the soil and aquifer. The collected effluent including waste water and waste vapor contains a considerably amount of hydrocarbons and/or heavy metals, which can cause secondary pollution of the environment if without proper treatment.
Physical adsorption and chemical oxidation methods can be used for disposal of the waste water and waste vapor.
However, the cost including capital investment and operating cost is high; in addition, a large amount of solid sludge is commonly produced and needs further treatment or landfill. Currently, many soil remediation systems use conventional biological wastewater treatment processes for disposal of the wastewater; however, these processes were fundamentally designed for treating easily biodegradable organic compounds and can be operated only at a comparatively low concentration and loading rate of these organic compounds. As a result, these processes are normally sensitive to loading shock due to the organic concentration increase and organic composition change, especially the appearance of difficultly biodegradable organic compounds including complex hydrocarbon. The bioreactor operating failure can cause critical problem on the performance of soil remediation and make more troubles than solving the soil contamination problem.
This application presents embodiments of an invention which include a fast and efficient methods for disposal of the waste water and waste vapor collected from treating contaminated soil and groundwater in-situ and ex-situ. The high-rate bioreactor system comprises a oil/water separator and a modulated submerged attached growth bioreactor in which biochar but not limited to other materials including plastic material, wood, gravel can be used as the carriers providing habitants for microorganisms to grow. In this innovatively designed bioreactor, the carriers are contained in modules so that the microorganisms are maintained to prevent from loss due to high hydraulic fluid shear happening in the reactor. In this way, the microorganism residence time (MRT) can be separated from the waste water/waste vapor residence time in the bioreactor and thus the MRT
can be controlled at the required length to achieve high number of the microorganisms. Thus, a biological system of the balanced ecological structure is developed for a harmonized syntrophic biological food web system, which involves various synergistically functioning heterotrophs and autotrophs for effective biological removal of carbon, nitrogen, phosphorus from the waste water and vapor. As a result, the developed microbial system can have stronger resistance to organic loading shock and much more efficient to degrade hydrocarbons of low biodegradability. In addition, the aqueous phase of the bioreactor is well mixed due to the air or waste vapor provided to the bioreactor. Consequently, the waste water and vapor are uniformly distributed into the bioreactor and provide good dilution of waste water and vapor in the bioreactor to further reduce the organic loading shock. Furthermore, the biochar material has vast surface area for strong and efficient adsorbing of heavy metals and hydrocarbons from the waste water and waste vapor for a longer-term decomposition in the bioreactor.
This application also represents a method to recover, recycle and reuse the treated waste water for soil remediation. According to the method, the waste water collected from an in-situ soil remediation well or ex-situ soil pile is first pumped into the oil/water separator to recovery hydrocarbon as oil and the cleaned aqueous phase is then pumped into the bioreactor for biological treatment. After the treatment, the water with or without addition of more functional additives is pumped back to the well be used as the washing liquid for soil remediation. In this way, the water usage for soil remediation is minimized. In addition, due to the long MRT, the solids production is minimized for sludge treatment.
This application also represents a method to recover, recycle and reuse the treated waste water for soil remediation under aerobic and anaerobic conditions. Due to the composition and concentration of the organic contaminants in the waste water as well as the treatment targets,
2 aerobic or anaerobic conditions can be chosen to operate the bioreactor system for achieving the best performance of biological degradation and waste water treatment.
This application also represents a method to recover, recycle and reuse the treated waste water for soil remediation operated at the batch and continuous mode. Due to the site remediation geological and operating conditions as well as the composition and concentration of the organic contaminants in the waste water, the invented bioreactor system can be chosen to operate at the batch or continuous mode to have the flexibility for achieving the best performance of biological degradation and waste water treatment.
This application also represents a method to recover, recycle and reuse the treated waste water for soil remediation operated on site or installed and operated on a mobile unit. Due to the site geological condition and the size of the area for soil remediation as well as the composition and concentration of the organic contaminants in the waste water, the invented bioreactor system can be manufactured and installed as an on-site unit or a mobile unit to have the flexibility for achieving the best performance of biological degradation and wastewater treatment based on the condition of the site and the size of the soil remediation task.
This application also represents a method to treat waste vapor collected from soil remediation.
According to the method, the vapor collected from an in-situ soil remediation well or ex-situ soil pile is pumped into the bioreactor for removal of volatile organic compounds (VOCs) and inorganic toxic gases including hydrogen sulfide. The cleaned gas is then discharged from the bioreactor into the atmosphere.
This application also represents a method to treat waste vapor collected from soil remediation under aerobic and anaerobic conditions. Due to the composition and concentration of the organic contaminants in the waste water and waste vapor, aerobic or anaerobic conditions can be chosen to operate the bioreactor system for achieving the best performance of biological degradation and waste water/waste vapor treatment.
This application also represents a method treat waste vapor collected from soil remediation in the batch and continuous mode. Due to the site remediation geological and operating conditions as well as the composition and concentration of the organic contaminants in the waste water and waste vapor, the invented bioreactor system can be chosen to operate at batch or continuous
This application also represents a method to recover, recycle and reuse the treated waste water for soil remediation operated at the batch and continuous mode. Due to the site remediation geological and operating conditions as well as the composition and concentration of the organic contaminants in the waste water, the invented bioreactor system can be chosen to operate at the batch or continuous mode to have the flexibility for achieving the best performance of biological degradation and waste water treatment.
This application also represents a method to recover, recycle and reuse the treated waste water for soil remediation operated on site or installed and operated on a mobile unit. Due to the site geological condition and the size of the area for soil remediation as well as the composition and concentration of the organic contaminants in the waste water, the invented bioreactor system can be manufactured and installed as an on-site unit or a mobile unit to have the flexibility for achieving the best performance of biological degradation and wastewater treatment based on the condition of the site and the size of the soil remediation task.
This application also represents a method to treat waste vapor collected from soil remediation.
According to the method, the vapor collected from an in-situ soil remediation well or ex-situ soil pile is pumped into the bioreactor for removal of volatile organic compounds (VOCs) and inorganic toxic gases including hydrogen sulfide. The cleaned gas is then discharged from the bioreactor into the atmosphere.
This application also represents a method to treat waste vapor collected from soil remediation under aerobic and anaerobic conditions. Due to the composition and concentration of the organic contaminants in the waste water and waste vapor, aerobic or anaerobic conditions can be chosen to operate the bioreactor system for achieving the best performance of biological degradation and waste water/waste vapor treatment.
This application also represents a method treat waste vapor collected from soil remediation in the batch and continuous mode. Due to the site remediation geological and operating conditions as well as the composition and concentration of the organic contaminants in the waste water and waste vapor, the invented bioreactor system can be chosen to operate at batch or continuous
3 mode to have the flexibility for achieving the best performance of biological degradation and waste water and waste vapor treatment.
This application also represents a method to treat waste vapor collected from soil remediation operated on site or installed and operated on a mobile unit. Due to the site geological condition and the size of the area for soil remediation as well as the composition and concentration of the organic contaminants in the waste water and waste vapor, the invented bioreactor system can be manufactured and installed as an on-site unit or a mobile unit to have the flexibility for achieving the best performance of biological degradation and waste water/waste vapor treatment based on the condition of the site and the size of the soil remediation task.
This application also represents a method to treat waste vapor collected from soil remediation operated on site or installed and operated on a mobile unit. Due to the site geological condition and the size of the area for soil remediation as well as the composition and concentration of the organic contaminants in the waste water and waste vapor, the invented bioreactor system can be manufactured and installed as an on-site unit or a mobile unit to have the flexibility for achieving the best performance of biological degradation and waste water/waste vapor treatment based on the condition of the site and the size of the soil remediation task.
4
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2953951A CA2953951A1 (en) | 2017-01-06 | 2017-01-06 | A high-rate bioreactor system for soil remediation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2953951A CA2953951A1 (en) | 2017-01-06 | 2017-01-06 | A high-rate bioreactor system for soil remediation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2953951A1 true CA2953951A1 (en) | 2018-07-06 |
Family
ID=62783946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2953951A Abandoned CA2953951A1 (en) | 2017-01-06 | 2017-01-06 | A high-rate bioreactor system for soil remediation |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2953951A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113185367A (en) * | 2021-05-14 | 2021-07-30 | 上海交通大学 | Biogas residue modified biochar with pollution control and efficiency enhancement functions as well as preparation and application thereof |
-
2017
- 2017-01-06 CA CA2953951A patent/CA2953951A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113185367A (en) * | 2021-05-14 | 2021-07-30 | 上海交通大学 | Biogas residue modified biochar with pollution control and efficiency enhancement functions as well as preparation and application thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20190730 |