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Method for producing biogas by kelp residues through two-phase anaerobic fermentation

A technology for anaerobic fermentation and biogas production, applied in the field of biogas production, can solve the problems of short duration of gas production, peculiar smell, environmental pollution, etc., achieve efficient resource utilization, improve conversion utilization, and have broad market prospects Effect

Active Publication Date: 2015-03-11
DALIAN OCEAN UNIV +1
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Problems solved by technology

In addition, some studies have found that the combined fermentation of kelp dry powder and cow dung can help increase gas production and methane content, but single-phase fermentation will cause acidification, short duration of gas production, and poor process stability
[0005] At present, the utilization technology of aquaculture solid waste mainly includes: directly applying it to the farmland as organic fertilizer; or composting with other materials to prepare organic fertilizer; due to the high salt content and peculiar smell of marine aquaculture solid waste, direct use as organic fertilizer will cause serious pollution. soil alkalization and environmental pollution
[0006] To sum up, there are certain defects and limitations in the utilization of kelp algae residue and solid waste from cultivation.

Method used

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Embodiment Construction

[0018] Specific embodiments of the present invention will be described below.

[0019] Kelp algae dregs (with particle size of 0.2mm, moisture content of 92.8%, TSS of 7.2%, and C:N ratio of 6:1) extracted from fucoidan sulfate are directly used as fermentation raw materials; The sludge at the bottom of the sedimentation tank in the culture system (moisture content is 85.35%, TSS is 14.65%) is directly used as an organic carbon source for two-phase anaerobic fermentation of kelp algae residue to produce biogas;

[0020] Take the fresh activated sludge of the anaerobic fermentation biogas production system, add kelp algal residue to the activated sludge according to 20% of the activated sludge mass, and continuously put the kelp algal residue into the activated sludge according to the above mass ratio for 18-20 days, and adjust the pH value to 7-9, and carry out domestication under the conditions of 35±1° C. to obtain the methanogenic inoculum strain,

[0021] Take the fresh a...

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Abstract

The invention discloses a method for producing biogas by kelp residues through two-phase anaerobic fermentation. According to the method, the biogas is produced by mixing the kelp residues with mariculture solid waste through two-phase anaerobic hydrolyzation and fermentation. By virtue of the method, the biogas yield, the methane content and the system stability can be increased, the transformed utilization rate of the kelp residues can be improved simultaneously; and in addition, the efficient resource-utilization of the mariculture solid waste is solved. The method is simple to operate and low in operating cost and has comprehensive effects of efficient utilization of fishery waste, environment appreciation and energy development. Thus, the method integrates various advantages and is especially suitable to popularization and application in the field and very broad in market prospect.

Description

technical field [0001] The invention relates to a method for producing biogas, in particular to a method for producing biogas by two-phase anaerobic fermentation of kelp algae residue. Background technique [0002] Kelp is one of the large-scale seaweeds cultivated on a large scale. It is currently widely used to extract various nutrients such as iodine, alginate, and polysaccharides. During the deep processing of kelp, about 50% of the algae residue will be produced. These waste residues contain a large amount of cellulose and a small amount of algin, fucoidan, etc., and are an important resource that can be used. On the other hand, seawater recirculating aquaculture has become one of the main industries of the marine economy. During the breeding process, 1-3% of the fish body weight needs to be fed every day, and 25-50% of the bait will be in the form of feces. The form of waste and residual bait is discharged into the water to form aquaculture solid waste. The output of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02C02F11/04
CPCY02E50/343Y02E50/30
Inventor 李秀辰李丰张国琛母刚牟晨晓
Owner DALIAN OCEAN UNIV