Device for culturing microalga processing biogas slurry to couple with anaerobic fermentation and operation method thereof

An anaerobic fermentation and operation method technology, applied in enzymology/microbiology devices, methods of supporting/immobilizing microorganisms, biomass post-treatment, etc., can solve the problems of long time, low efficiency of biogas slurry treatment, and non-recyclable water resources and other problems to achieve the effect of saving water resources and improving low efficiency

Inactive Publication Date: 2018-06-12
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microalgae-coupled biogas slurry system still needs to be improved. Microalgae absorb ammonia nitrogen slowly. When the volume is equal to that of anaerobic fermentation, the treatment capacity cannot match the amount of biogas slurry dischar

Method used

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  • Device for culturing microalga processing biogas slurry to couple with anaerobic fermentation and operation method thereof
  • Device for culturing microalga processing biogas slurry to couple with anaerobic fermentation and operation method thereof
  • Device for culturing microalga processing biogas slurry to couple with anaerobic fermentation and operation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0041] Example 1

[0042] In the membrane photobioreactor coupled with the semi-continuous anaerobic fermentation, the waste liquid and residue discharged daily from the semi-continuous anaerobic fermentation tank are first separated, and the separated biogas slurry is added to the biogas slurry storage tank. Add 1000mL of microalgae liquid named C. sorokiniana containing 0.1g / L into the microalgae culture tank. The membrane photobioreactor is placed in a light incubator, and the temperature in the incubator is set to 25°C and the light intensity is 7200 Lux. Pass 1L / L·min of air into the microalgae culture tank through an air pump. The peristaltic pump drives the microalgae to circulate outside the membrane at a circulating flow rate of 150-160 mL / min, so that the biogas slurry maintains a circulating flow of 50-60 mL / min in the hollow fiber membrane. After one day of cultivation, the ammonia nitrogen in the biogas liquid dropped from about 1300 mg / L to about 3 mg / L.

[0043] U...

Example Embodiment

[0044] Example 2

[0045] In the semi-continuous anaerobic fermentation of the coupling device, first 40-60 mL of the treated biogas slurry discharged from the membrane photobioreactor daily is mixed with 40-60g pig manure and added to the biogas slurry storage tank. The semi-continuous anaerobic fermentation tank is placed in the biochemical incubator, the rotation speed of the mixing stirrer at the bottom of the tank is set to 100-200r / min, and the temperature in the biochemical incubator is 37°C. The biogas output of the semi-continuous anaerobic fermentation tank is about 800 mL / d.

[0046] Divide the treated biogas slurry by water and keep the fermentation raw materials, temperature, stirring rate and other parameters the same as the previous batch. The biogas output of the semi-continuous anaerobic fermentation tank in the control group is about 800mL / d, and the treated biogas slurry is used as raw material There was no significant difference in gas production in the experim...

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Abstract

The invention relates to a device for culturing microalga processing biogas slurry to couple with anaerobic fermentation and operation method thereof. The device is characterized in that an anaerobicfermentation device is provided with a membrane type biological reactor for processing the nitrogen and phosphorus of the biogas slurry, the membrane type biological reactor is provided with a biogasslurry storage tank, a peristaltic pump, a microalga culture tank, an air pump and photobioreactor column with an embedded hollow fiber membrane, and the anaerobic fermentation device comprises a semi-continuous anaerobic fermentation tank, an even-mixing stirrer in the tank, a tank feed inlet upper valve and a tank discharge outlet lower valve. The device has the advantages that the defects thatthe ammonia and nitrogen absorption speed of microalgae, the processing quantity cannot match with the discharged biogas slurry quantity of single-batch anaerobic fermentation when the volume of the microalgae is identical with the anaerobic fermentation, and biogas slurry processing is low in efficiency and long in time are improved; the membrane type biological reactor is coupled with the semi-continuous anaerobic fermentation tank, the daily discharged biogas slurry of the semi-continuous anaerobic fermentation tank can be processed by the microalgae on that very day and flow back again into the anaerobic fermentation tank, biogas slurry recycling is achieved, water resources are saved, and nitrogen and phosphorus recycling is achieved.

Description

technical field [0001] The invention relates to the coupling of microalgae treatment biogas slurry and anaerobic fermentation, in particular to a coupling anaerobic fermentation device for cultivating microalgae treatment biogas slurry using a membrane photobioreactor and an operating method thereof. Background technique [0002] Anaerobic fermentation is widely used in clean energy to solve the problem of waste pollution. With the development of anaerobic fermentation technology, a large amount of biogas slurry discharge is inevitable ([1] GCB Bioenergy, 2014, 6, 465–472). Biogas slurry is rich in nitrogen sources. If it is discharged directly without effective treatment, there will be a risk of eutrophication in the water body, and it will also cause a large loss of beneficial resources. Cultivating microalgae to treat nutrients in biogas slurry while obtaining high value-added microalgae products has been generally considered a potential strategy to achieve emission redu...

Claims

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Application Information

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IPC IPC(8): C12M1/04C12M1/00C02F11/04C12N1/12
CPCC02F11/04C12M21/02C12M23/58C12M25/10C12M29/00C12M29/18C12N1/12
Inventor 李清彪陈曦何宁王远鹏郑艳梅王海涛
Owner XIAMEN UNIV
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