Method for cultivating microalgae with pig farm biogas slurry and making full use of microalgae to produce bio-oil

A technology for bio-oil and microalgae oil, applied in microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of nutrient waste, land salinization, excessive heavy metals, etc., and achieve high value and salt mitigation. Alkalizing, low cost effect

Inactive Publication Date: 2020-08-07
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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Problems solved by technology

[0005] Aiming at the possibility that the treatment of pig farm biogas slurry may cause land salinization, excessive heavy metals and waste of nutrients, as well as the current increasingly serious energy problems, the present invention provides a method of using pig farm biogas slurry to breed microalgae and fully utilizing it to prepare bio-oil Methods

Method used

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  • Method for cultivating microalgae with pig farm biogas slurry and making full use of microalgae to produce bio-oil

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 Shown, a kind of method that utilizes pig farm biogas slurry to culture microalgae and fully utilizes to prepare bio-oil is characterized in that, comprises the following steps:

[0032] (1) Use pig farm biogas slurry to cultivate microalgae:

[0033] The biogas slurry obtained from the pig farm was centrifuged at a speed of 10000r / min for 15 minutes, and the supernatant was taken and stored in a refrigerator at 4°C for later use. Prepare a 10% microalgae culture solution by preparing the stock solution of the culture solution, deionized water and additives in a certain ratio in a container. The addition amounts of ferric ammonium citrate, dipotassium hydrogen phosphate and magnesium sulfate heptahydrate in the microalgae culture solution were 0.03g / L, 0.13g / L and 0.44g / L respectively, and the culture solution contained 40.1mg / L of NH 4 + -N, 2.5mg / L of PO 4 3- The total N element content is 46mg / L, and the total P element content is 2.7mg / L. Ster...

Embodiment 2

[0041] The difference between this example and Example 1 is that the pyrolysis temperature of the algal residue is set at 700° C., and the bio-oil yield of the algal residue sample is 29.34%.

Embodiment 3

[0043] The difference between this example and Example 1 is that the pyrolysis temperature of the algal residue is set at 600° C., and the bio-oil yield of the algal residue sample is 15.12%.

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Abstract

The invention provides a method for culturing microalgae with pig farm biogas slurry and making full use of the microalgae to produce bio-oil. The method comprises the following steps of: preparing a5-20% microalgae culture solution by using the pig farm biogas slurry, and inoculating the microalgae into the culture solution for culturing; grinding the microalgae cultured by the pig farm biogas slurry and quartz sand according to a certain mass ratio, and adding an organic solvent for extraction to realize extraction of microalgae grease and preparation of microalgae residue; carrying out esterification reaction on the microalgae grease to obtain bio-oil; and pyrolyzing the microalgae residue in a cracking device at 300-800DEG C in an atmosphere of inert gas to prepare the bio-oil again.On the basis of the existing pig manure biogas engineering, the pig farm biogas slurry is used for culturing microalgae, so that purification treatment of the pig farm biogas slurry is realized, and alarge amount of biomass energy is accumulated; by adding the additives into the biogas slurry, the growable biomass and grease content of microalgae in the biogas slurry are improved; and through full utilization of the microalgae, the energy utilization potential of the biogas slurry and the microalgae is improved, and the energy problem is relieved to a certain extent.

Description

technical field [0001] The invention relates to the field of livestock and poultry excrement treatment energy, in particular to a method for cultivating microalgae with biogas slurry from pig farms and making full use of it to prepare bio-oil. Background technique [0002] At present, with the progress of society and the development of science and technology, people's living standards are constantly improving, and the proportion of meat in daily diet is getting higher and higher. Pork is one of the meat that people like to eat most. With the increasing demand for pork, the scale of pig farming continues to expand, accompanied by a rapid increase in pig manure emissions from pig farms. For the treatment of pig manure, it is generally processed through biogas projects, but biogas projects will lead to the production of a large amount of biogas slurry, and the transportation and treatment costs of biogas slurry are high, and the land that can realize biogas slurry consumption i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/12C12P7/64C11B1/00C11C3/04C10G1/00C12R1/89
CPCC10G1/00C10G2300/1011C11B1/00C11C3/04C12N1/12C12P7/6463Y02E50/30
Inventor 李刚黄志刚田斌张江
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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