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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 discharged from a single batch of anaerobic fermentation, and the efficiency of biogas slurry treatment is low. , long time defects
At the same time, the treated biogas slurry is usually discharged directly, making it impossible for water resources to be recycled

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

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Experimental program
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Effect test

Embodiment 1

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

[0043] Under the ...

Embodiment 2

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

[0046] Divide water to replace the treated biogas slurry, keep the same parameters as the previous batch of fermentation raw materials, temperature, stirring rate, etc., the biogas output of the semi-continuous anaerobic fermentation tank in the control group is about 800mL / d, which is the same as that using the treated biogas slurry as raw material There was no significant difference in the gas productio...

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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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