Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for improving straw methane yield and reducing methane liquid by methane liquid circulation

A biogas slurry and biogas technology, applied in fermentation, waste fuel, etc., can solve environmental pollution and other problems, achieve environmental friendliness, save experimental drug costs and water resources

Active Publication Date: 2012-07-18
BEIJING UNIV OF CHEM TECH
View PDF3 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The waste generated after anaerobic digestion of straw contains a large amount of biogas slurry, and the direct discharge of biogas slurry will cause serious environmental pollution, and there are also some uncertainties in the actual utilization of biogas slurry

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for improving straw methane yield and reducing methane liquid by methane liquid circulation
  • Method for improving straw methane yield and reducing methane liquid by methane liquid circulation
  • Method for improving straw methane yield and reducing methane liquid by methane liquid circulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]The effective volume of the anaerobic digestion reactor in the experimental device used in this example is 8L, the anaerobic fermentation material is wheat straw, and the load is 65gTS / L (TS is the dry weight of wheat straw). In the continuous anaerobic fermentation experiment with stable operation, wheat straw with a dry weight of 12.8 g was chemically pretreated (the amount of NaOH powder and water added were 2% and 600% of the dry weight of the wheat straw, respectively) and then sent into the mixing tank I. . Measure the biogas slurry parameters in the collection pond, the ammonia nitrogen concentration is 10mg / L, and the auxiliary parameters are (BOD=1000mg / L; COD=4000mg / L; Zn 2+ =5mg / L; Cu 2+ =1mg / L; pH=7.2), since the ammonia nitrogen concentration and auxiliary parameters are not beyond the specified range, then the ammonia nitrogen concentration C=10mg / L, the biogas slurry circulation ratio is determined to be 100%. The 70mL biogas slurry is sent from the coll...

Embodiment 2

[0037] The effective volume of the anaerobic digestion reactor in the experimental device used in this example is 8L, the anaerobic fermentation material is wheat straw, and the load is 65gTS / L (TS is the dry weight of wheat straw). In the continuous anaerobic fermentation experiment with stable operation, wheat straw with a dry weight of 12.8 g was chemically pretreated (the amount of NaOH powder and water added were 2% and 600% of the dry weight of the wheat straw, respectively) and then sent into the mixing tank I. . Measure the biogas slurry parameters in the collection pond, the ammonia nitrogen concentration is 380mg / L, and the auxiliary parameters are (BOD=1500mg / L; COD=5000mg / L; Zn 2+ =10mg / L; Cu 2+ =2mg / L; pH=7.25), since the ammonia nitrogen concentration and auxiliary parameters do not exceed the specified range, the ammonia nitrogen concentration C=380mg / L determines that the biogas slurry circulation ratio is 75%. The 52.5mL biogas slurry is sent from the collec...

Embodiment 3

[0039] The effective volume of the anaerobic digestion reactor in the experimental device used in this example is 8L, the anaerobic fermentation material is rice straw, and the load is 65gTS / L (TS is the dry weight of rice straw). In the continuous anaerobic fermentation experiment with stable operation, rice straw with a dry weight of 12.8 g was chemically pretreated (the amount of NaOH powder and water added were 2% and 600% of the dry weight of the rice straw, respectively) and then sent into the mixing tank I . Measure the biogas slurry parameters in the collection pond, the ammonia nitrogen concentration is 760mg / L, and the auxiliary parameters are (BOD=2000mg / L; COD=6000mg / L; Zn 2+ =15mg / L; Cu 2+ =3mg / L; pH=7.3), since the ammonia nitrogen concentration and auxiliary parameters do not exceed the specified range, the biogas slurry circulation ratio is determined to be 50% based on the ammonia nitrogen concentration C=760mg / L. The 35mL biogas slurry is sent from the coll...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for improving straw methane yield and reducing methane liquid by methane liquid circulation, which improves the methane yield of straw fermentation by 40-50%. A methane liquid recycle ratio is set to X according to methane liquid measurement index data, wherein X is more than or equal to 0% and is less than or equal to 100%; otherwise, the methane liquid is not recycled; the ammonia nitrogen concentration is Cmg / L; if C / 15 is equal to N...n, the recycle ratio is that X is equal to (100-N)%; if the ammonia nitrogen concentration C is more than 1500mg / L, the methane liquid does not recycle; in addition, the auxiliary parameter range of the recycle ratio is that BOD (Biochemical Oxygen Demand) is more than or equal to 4000mg / L, COD (Chemical Oxygen Demand) is more than or equal to 10000mg / L, Zn2+ is more than or equal to 30mg / L, Cu2+ is more than or equal to 6mg / L and pH is more than or equal to 7.5; when the auxiliary parameter reaches a specified range, the methane liquid does not circulate; and the ammonia nitrogen concentration is regulated to be less than or equal to 200mg / L, the BOD is less than or equal to 500mg / L, the COD is less than or equal to 1000mg / L, Zn2+ is equal to 0, Cu2+ is equal to 0 and pH is equal to 6.8. The methane liquid is recycled by controlling the methane liquid circulation ratio, the methane emission is reduced, and meanwhile, cost is saved for stably operating the fermentation.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and relates to a method for increasing straw gas production, improving gas quality and reducing biogas slurry discharge by controlling biogas slurry circulation. Background technique [0002] my country is a large agricultural country with abundant straw resources, ranking first in the world. Except for a small amount of effective use, most of the straw is turned to open burning or stacked in the field, which not only causes serious environmental problems, but also wastes a lot of resources. Converting straw into clean energy through anaerobic digestion is an effective way to realize harmless and resourceful use of straw. [0003] The waste generated after anaerobic digestion of straw contains a large amount of biogas slurry, and the direct discharge of biogas slurry will cause serious environmental pollution, and there are some uncertain factors in the actual utilization of biogas...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 李秀金郝力彪袁海荣朱保宁邹德勋刘研萍庞云芝
Owner BEIJING UNIV OF CHEM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com