Serial system light source control method for improving grade of methane by microalgae

A tandem biogas technology, applied in the field of environmental engineering, can solve problems such as high process complexity, high cost of adsorbent, and insufficient stability of the effect, and achieve the effects of improving economic efficiency, saving costs, and avoiding adverse effects

Inactive Publication Date: 2013-04-03
FUDAN UNIV
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Problems solved by technology

Their obvious disadvantages are the high cost of adsorbent, high process complexity, high equipment cost and operation and maintenance cost, and the effect is not stable enough.

Method used

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  • Serial system light source control method for improving grade of methane by microalgae

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Effect test

Embodiment 1

[0023] A tandem system light source control and energy saving method using microalgae to improve biogas grade: the tandem system has a total of 9 stages, the size of each stage is 3 m×3 m×3 m, and the biogas slurry is 1.0 m 3 As a nutrient substrate for microalgae cultivation, the volume of biogas is 8.0 m 3 ; inoculated with diatoms Nitzki Nitzschia palea The initial density is 400 mg L -1 , the photoperiod is 12 h / 12 ​​h, the control temperature of the system reactor is 30±0.5 °C, the working time of each reactor is 72 h, and the fixed light intensity is 300 μmol m -2 the s -1 ; Optimize the light quality, and compare the biogas grade improvement effects of red light, blue light, yellow light, green light and white light of different light quality LED lights.

[0024] The raw biogas grade is CH 4 The content is 57.21±8.96%. After the quality of red light, blue light, yellow light, green light and white light of the series system LED light quality is improved, they resp...

Embodiment 2

[0026] A tandem system light source control and energy saving method using microalgae to improve biogas grade: the tandem system has a total of 10 stages, and the size of each stage is 2 m×2 m×4 m, and the biogas slurry is 2.0 m 3 As a nutrient substrate for microalgae cultivation, the volume of biogas is 14.0 m 3 ; Inoculated with Chlorella Chlorella sp. The initial density is 350 mg L -1 , the photoperiod is 12 h / 12 ​​h, the control temperature of the system reactor is 25±0.5 °C, the working time of each reactor is 72 h, and the red light quality of LED is fixed; the light intensity is optimized, and the fixed light intensity experiment group is compared with 50 , 100, 200, 300 and 400 μmol m -2 the s -1 The effect of biogas grade improvement.

[0027] The raw biogas grade is CH 4 The content is 60.83±7.36%, after the series system LED fixed light intensity 50, 100, 200, 300 and 400 μmol m -2 the s -1 After the grade upgrade, respectively reach CH 4 The contents a...

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Abstract

The invention belongs to the technical field of environmental engineering, and particularly relates to an energy-saving serial system light source control method for improving grade of methane by microalgae. The method comprises the steps of building a serial reactor system; using fermentation waste biogas slurry as a nutrient-rich substrate to inoculate microalgae in a reactor; and staying for a period of time in the previous stage of serial reactor to enable methane to enter the next stage of serial reactor so as to gradually absorb CO2 in the methane to improve the grade of the methane. A light source is controlled when the system runs; and the control comprises optimization of light quality and optimization of light strength in each stage of reactor, so as to achieve the purpose of saving energy and improving the economic benefit of the system. By adopting the method disclosed by the invention, the purpose of economically and efficiently improving the grade of the methane can be achieved by controlling of the light source of the system; meanwhile, the fermentation waste biogas slurry can be purified; new pollutant is hardly generated in the process, and the method has the advantages of being high in economic benefit, simple and feasible, and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to an energy-saving method for regulating and controlling light sources of a series system using microalgae to improve the grade of biogas. Background technique [0002] In the development process of my country's rural biogas industry, due to the design and maintenance of fermentation equipment, as well as the quality of fermentation raw materials, it is difficult for existing fermentation equipment to maximize its benefits. Some fermentation devices were abandoned, so that the straw that should have entered the fermentation device was burned, causing serious air pollution; livestock and poultry manure that should have been fermented was discharged randomly, resulting in eutrophication of the water body. Although some fermentation devices are still in operation, the biogas is not used but discharged directly because of the low grade of the biogas produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/84B01D53/62C10L3/10C02F3/34C12N1/12
CPCY02E50/343C12M21/02C12M47/18Y02E50/30
Inventor 郑正颜诚张丽王东钱俊成
Owner FUDAN UNIV
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