Method capable of simultaneously purifying biogas slurry and enhancing biogas grade

A biogas and biogas slurry technology, applied in the field of environmental engineering, can solve problems such as eutrophication and achieve cost-saving effect

Inactive Publication Date: 2013-03-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The by-product of biogas anaerobic fermentation, biogas slurry is a high-load pollutant, which is difficult to be accepted by general sewage treatment plants and sewage treatment facilities, and discharge into water bodies will cause serious eutrophication and other problems

Method used

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  • Method capable of simultaneously purifying biogas slurry and enhancing biogas grade

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Embodiment 1

[0016] A new method that can purify biogas slurry and improve the grade of biogas at the same time. Construct a multi-stage cascaded photoreactor system with a total of 10 stages, each with a size of 5 m×5 m×5 m; inoculate the Cyanophyta Anabaena Anabaena sp. Initial density 330 mg L -1 , the total volume of algae and biogas slurry is 15.0 m 3 , biogas volume 110.0 m 3 ; The photoperiod is 10 h / 10 h, the control temperature of the system reactor is 25±0.5 °C, the working time of each reactor is 60 h, and the artificial light source is LED lamp white light 330 μmol m -2 the s -1 light intensity. Intake biogas grade is CH 4 54.83±7.93%; the initial pollutant load of biogas slurry is COD 5749.06±106.21 mg L -1 , total nitrogen TN 50.8±10.19, total phosphorus TP 1206.25±74.95. After the treatment of the multi-stage series photoreactor system, the grade of the output biogas reaches 82.26±6.51%, which meets the requirements of general biogas combustion; the pollutant load ...

Embodiment 2

[0018] A new method that can purify biogas slurry and improve the grade of biogas at the same time. 12-stage series photoreactor system, each stage is 6 m×6 m×6 m in size; inoculated with Chlorella algae Chlorella sp. Initial density 570 mg L -1 , the total volume of algae and biogas slurry is 36.0 m 3 , biogas volume 180.0 m 3 ; The photoperiod is 7 h / 7 h, the control temperature of the system reactor is 30±0.5 °C, the working time of each reactor is 56 h, and the artificial light source is LED lamp white light 270 μmol m -2 the s -1 light intensity. Intake biogas grade is CH 4 61.05±5.24%; the initial pollutant load of biogas slurry is COD 3291.32±2636.42 mg L -1 , total nitrogen TN 52.7±15.96, total phosphorus TP 841.35±68.24. After the treatment of the multi-stage series photoreactor system, the grade of the output biogas reaches 80.31±4.95%, which meets the requirements of general biogas combustion; the pollutant load of biogas slurry is significantly reduced, w...

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Abstract

The invention belongs to the technical field of environment engineering, and particularly relates to a method capable of simultaneously purifying biogas slurry and enhancing a biogas grade for a multistage reactor. The multistage reactor is formed by connecting a plurality of single-stage photobioreactors in series and enhances the biogas grade by absorbing CO2 contained in biogas by taking fermented waste biogas slurry as a culture medium for inoculating microalgae in each single-stage photobioreactor and utilizing the ultrahigh photosynthetic carbon sequestration capacity of the microalgae. The method disclosed by the invention can simultaneously purify the biogas slurry and enhance the biogas grade, hardly generates new pollutants in the process, and has the advantages of high practicability and good economic benefit.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method capable of simultaneously purifying biogas slurry and improving the grade of biogas. Background technique [0002] The development of my country's biogas industry has long been limited by the environmental pollution of the biogas by-product of anaerobic fermentation and the low-grade biogas itself. The by-product of biogas anaerobic fermentation, biogas slurry, is a high-load pollutant, which is difficult to be accepted by general sewage treatment plants and sewage treatment facilities. Discharge into water bodies will cause serious eutrophication and other problems. The content and composition of biogas by volume percentage are: CH 4 40%-75%, CO 2 15%-60%, water vapor 5%-10%, H 2 S 0.005%-2%, siloxane 0-0.02%, halogenated hydrocarbon VOC<0.6%, NH 3 <1%, O 2 0-1%, CO<0.6% and N 2 0-2%. It is generally believed that when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34B01D53/84B01D53/62C10L3/10
CPCY02E50/343C12M21/02C12M23/58C12M47/18Y02E50/30
Inventor 郑正颜诚张丽王东钱俊成
Owner FUDAN UNIV
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