A method for producing biogas with molasses as substrate

A molasses and substrate technology, applied in biosynthesis, waste fuel, fermentation, etc., to achieve good efficiency and effect, accelerated development, and controllable production scale

Active Publication Date: 2016-04-20
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is no literature report at home and abroad to directly use molasses as raw material for biogas fermentation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Obtain cane molasses from a sugar factory; adjust the pH of the molasses to 10.0 with lime, filter, and obtain the molasses filtrate after neutralization.

[0028] The obtained molasses filtrate was diluted with water to an initial COD of 2000 mg / L, potassium dihydrogen phosphate was added to adjust the diluted molasses C / P mass ratio to 200:1, and yeast powder was added to adjust the diluted molasses C / N mass ratio to 10:1.

[0029] The anaerobic granular sludge is loaded into the anaerobic fermentation tank, and the amount of sludge is 50% of the volume of the reactor.

[0030] Pump the molasses dilution containing phosphorus source into the anaerobic fermentation tank for continuous fermentation. The fermentation raw material stays in the anaerobic reactor for 6 hours, the fermentation temperature is 35°C, and the biogas (biogas) flows from the top of the fermentation reactor. discharge. The biogas production efficiency is 30%.

Embodiment 2

[0032] Obtain beet molasses from a sugar factory; adjust the pH of the molasses to 5.5 with calcium carbonate, filter, and obtain a molasses filtrate after neutralization.

[0033] The obtained molasses filtrate was diluted with water to an initial COD of 12000 mg / L, ammonium dihydrogen phosphate was added to adjust the diluted molasses C / P mass ratio to 100:1, and urea was added to adjust the diluted molasses C / N mass ratio to 80:1.

[0034] The anaerobic granular sludge is loaded into the upflow anaerobic sludge bed reactor, and the amount of sludge loaded is 10% of the volume of the reactor.

[0035] Pump the molasses dilution into the upflow anaerobic sludge bed reactor for continuous fermentation. The fermentation raw material stays in the anaerobic reactor for 2 hours, the fermentation temperature is 15°C, and the biogas (biogas) is discharged from the fermentation reactor. Drain the top. The biogas production efficiency is 35%.

Embodiment 3

[0037] Obtain cane molasses from a sugar factory; adjust the pH of the molasses to 7.5 with sodium carbonate, filter, and obtain the molasses filtrate after neutralization.

[0038] The obtained molasses filtrate was diluted with water to an initial COD of 25000 mg / L, sodium hydrogen phosphate was added to adjust the diluted molasses C / P mass ratio to 300:1, and ammonium carbonate was added to adjust the diluted molasses C / N mass ratio to 60:1.

[0039] The anaerobic activated sludge is loaded into the anaerobic granular sludge expanded bed reactor, and the amount of sludge loaded is 80% of the volume of the reactor.

[0040] Pump the molasses dilution into the anaerobic granular sludge expanded bed reactor for continuous fermentation. The fermentation raw material stays in the anaerobic reactor for 15 hours, the fermentation temperature is 50°C, and the biogas (biogas) is discharged from the fermentation reactor. Drain the top. The biogas production efficiency is 40%.

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PUM

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Abstract

The invention discloses a method for producing biogas by taking molasses as a substrate. The method can be used for turning waste into wealth, the fermentation scale can be adjusted according to practical needs, the biogas generation efficiency is high, acidification does not occur easily in the fermentation process, and the problem of solid and semisolid raw materials is avoided in the collection and transportation of raw materials; compared with the technology taking the wastewater of molasses fermentation ethanol as a substrate, the molasses substrate adopted by the method disclosed by the invention contains a large amount of fermentable sugar as well as a large amount of fermentable components, the organic components in the molasses are efficiently utilized and directly applied to biogas fermentation, and thus the biogas fermentation efficiency and effect are better; moreover, the adopted technology and equipment are simpler, and a hydrolysis process of lignocellulose raw material is avoided; by adopting the method disclosed by the invention, the biogas fermentation technology is popularized in the regions with abundant molasses sources, and the development of renewable energy of the country and even the world is greatly accelerated.

Description

Technical field: [0001] The invention relates to a method for producing biogas, in particular to a method for producing biogas with molasses as a substrate. Background technique: [0002] Biogas, commonly known as biogas, is the product of microorganisms co-fermenting degradable organic waste under anaerobic conditions. The shrinking of traditional energy supply and the need to increase the share of renewable energy in energy consumption have made biogas more and more important. [0003] Molasses is a viscous, dark brown, semi-fluid substance, which is a by-product of the sugar industry. Its composition varies with different sugar raw materials and processing conditions. It mainly contains a large amount of fermentable sugar (mainly sucrose), Therefore, molasses is expected to be an ideal substrate for biogas fermentation. [0004] At present, most of the general biogas fermentation methods at home and abroad are solid or semi-solid feed, that is, solid and semi-solid raw m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCY02E50/30Y02P20/59
Inventor 陈新德黄超熊莲郭海军林晓清陈雪芳张海荣王波杨会娟
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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