NL2031876A - Method for co-producing methane and bio-oil by coupling anaerobic digestion of domestic wastewater with microalgae cultivation - Google Patents

Method for co-producing methane and bio-oil by coupling anaerobic digestion of domestic wastewater with microalgae cultivation Download PDF

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NL2031876A
NL2031876A NL2031876A NL2031876A NL2031876A NL 2031876 A NL2031876 A NL 2031876A NL 2031876 A NL2031876 A NL 2031876A NL 2031876 A NL2031876 A NL 2031876A NL 2031876 A NL2031876 A NL 2031876A
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oil
bio
biogas
anaerobic digestion
microalgae
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NL2031876A
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Dutch (nl)
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Kong Tianqi
Yang Tianhua
Li Rundong
Zhang Wanli
Xing Wanli
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Univ Shenyang Aerospace
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
    • C10G1/04—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by extraction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
    • B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01D53/26—Drying gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
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    • B01D53/52—Hydrogen sulfide
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10L1/02—Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
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    • C11B1/00—Production of fats or fatty oils from raw materials
    • C11B1/02—Pretreatment
    • C11B1/04—Pretreatment of vegetable raw material
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    • C11B1/00—Production of fats or fatty oils from raw materials
    • C11B1/06—Production of fats or fatty oils from raw materials by pressing
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
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    • C11B1/00—Production of fats or fatty oils from raw materials
    • C11B1/10—Production of fats or fatty oils from raw materials by extracting
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
    • C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
    • C12P5/023—Methane
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
    • C12P7/6436—Fatty acid esters
    • C12P7/6445—Glycerides
    • C12P7/6463—Glycerides obtained from glyceride producing microorganisms, e.g. single cell oil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/24—Hydrocarbons
    • B01D2256/245—Methane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2258/00—Sources of waste gases
    • B01D2258/05—Biogas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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Abstract

A method for co—producing methane and bio—oil by coupling anaerobic digestion of domestic wastewater with microalgae cultivation is provided, including: (1) removing suspended matters from domestic wastewater; (2) performing anaerobic digestion fermentation. reaction; (3) purifying, desulfurizing, and drying marsh gas: one part of the marsh gas is used for combustion for power generation, and the other part is used for separating CO2 and biomethane; CO2 generated by the combustion for power generation enters an oil—enriched, microalgae cultivation system; the combustion for power generation supplies electric energy to a light source; (4) adding water into biogas slurry for dilution, performing sterilization treatment and aeration treatment, and adjusting a pH value; (5) applying the pretreated biogas slurry to oil—enriched microalgae cultivation; and (6) squeezing oil— enriched, microalgae to obtain bio—oil, and returning remaining algae residues to the anaerobic digestion fermentation reaction.

Description

METHOD FOR CO-PRODUCING METHANE AND BIO-QIL BY COUPLING ANAEROBIC
DIGESTION OF DOMESTIC WASTEWATER WITH MICROALGAE CULTIVATION
TECHNICAL FIELD
The present invention belongs to the technical field of wastewater treatment and resource recovery, and specifically re- lates to a method for co-producing methane and bio-oil by coupling anaercbic digestion of domestic wastewater with microalgae culti- vation.
BACKGROUND ART
The rapid development of urbanization and the extensive use of organic fertilizers in modern agriculture have produced a large amount of domestic wastewater with high nitrogen, phosphorus, and organic matter content. Direct drainage of the domestic wastewater causes serious water pollution and brings a greater threaten to urban and agricultural water. At the same time, the domestic wastewater is also an excellent substrate for anaerobic digestion.
Anaerobic digestion can not only bring economic benefits, but also effectively solve the problem in treatment of the domestic sewage, thus truly achieving harmlessness and resource utilization.
Biogas slurry is a liquid residue of the anaerobic digestion, with complex compositions, including nutrients such as ammonia ni- trogen, nitrate nitrogen, nitrite nitrogen and a small amount of organic nitrogen, as well as trace elements and vitamins such as
Ca, Mg, Fe, and Zn required by crops. The biogas slurry plays an important role in regulating the growth and development of the crops, and, at the same time, will breed a large number of micro- organisms and miscellaneous algae.
SUMMARY
The present invention aims to provide a method for co- producing methane and bio-oil by coupling anaerobic digestion of domestic wastewater with microalgae cultivation. High-quality me- thane and bio-cil are prepared by pretreatment and anaerobic di-
gestion of domestic wastewater, pretreatment of biogas slurry, pu- rification of biogas.
The method of the present invention includes the following steps: (1) pretreating domestic wastewater to remove suspended mat- ters, thus preparing pretreated wastewater; (2) introducing the pretreated wastewater into an anaerobic digestion fermentation reactor for anaerobic digestion reaction, thus producing bicgas and biogas slurry; {3) introducing the biogas into a desulfurizing tower for pu- rification and desulfurization, and then drying the biogas to form purified biogas: one part of the purified biogas is used for com- bustion for power generation, and the other part is introduced in- to a separation system to separate CO; and biomethane; the CO, serving as a gas fertilizer enters an oil-enriched microalgae cul- tivation system, and CO: generated by the combustion for power gen- eration and serving as a gas fertilizer enters the oil-enriched microalgae cultivation system; the combustion for power generation supplies electric energy to a light source; the light source irra- diates the oil-enriched microalgae cultivation system; (4) adding water into the biogas slurry for dilution to form diluted biogas slurry; adding trichloroisocyanuric acid into the diluted biogas slurry for sterilization treatment; using an aera- tion system to perform aeration treatment with air; then adding a sodium carbonate solution to adjust a pH value to 7.0-7.5, thus preparing pretreated biogas slurry; (5) delivering the pretreated biogas slurry into the oil- enriched microalgae cultivation system for oil-enriched microalgae cultivation under the gas fertilizer and the light source, thus producing oil-enriched microalgae; and (6) squeezing the oil-enriched microalgae to obtain bio-oil, and returning remaining algae residues to the anaerobic digestion fermentation reactor for anaerobic digestion fermentation reaction together with the pretreated wastewater.
In the above step (1), the pretreatment means that the domes- tic wastewater passes through a grating, then flows through a set- tling pit and a settling basin, and is then discharged, so that the suspended matters in the domestic wastewater are removed to form the pretreated wastewater.
In the above step (2), the anaerobic digestion fermentation reaction is carried out at a temperature of 30-40°C for at least 8 h.
In the above step (2), the organic matter content of the bio- gas slurry is less than that of the pretreated wastewater by 45% or above.
In the above step (3), the purification and desulfurization mean removing H,S in the biogas, and the drying means removing wa- ter vapor from the biogas.
In the above step (3), a main functional component of the separation system is a polydimethylsiloxane (PDMS) /polyetherimide (PEI) composite film.
In the above step (3), a volume concentration of CH,4 in the biomethane is greater than or equal to 85%.
In the above step (3), waste heat of the combustion for power generation is used for heating and thermal insulation of the an- aerobic digestion fermentation reaction.
In the above step (3), the purified biogas introduced into the separation system accounts for 55-65% of all the purified bio- gas.
In the above step (4), the sterilization treatment is carried out for at least 12 h.
In the above step (4), the aeration treatment is carried out for at least 12 h.
In the above step (4), the concentration of the sodium car- bonate is 1-3 mol/L.
In the above step (4), the concentration of the trichloroiso- cyanuric acid in the diluted biogas slurry is 12-18 mg/L.
In the above step (4), the adding amount of the water is 4-10 times the mass of the biogas slurry.
In the above step (5), the oil-enriched microalgae cultiva- tion is carried out for at least 24 h.
In the above step (6), the bio-oil is squeezed by a screw press.
In the above step (6), grease remaining on the surface of the algae residue is recovered by a solvent extraction method. Chloro- form is used as a solvent. The method is washing the microalgae with the chloroform to remove the grease.
The purification of the biogas slurry by the microalgae is mainly to remove TN (mainly NH*%-N), TP, COD, and antibiotics. The microalgae can convert, through photo-heterotrophy and chemohete- rotrophy, organic pollutants in the biogas slurry into a carbon source and energy for growth. Due to a growth requirement of the microalgae itself, the microalgae will absorb all kinds of inor- ganic nitrogen and convert them into genetic and metabolic sub- stances required by the microalgae. The microalgae can use phos- phorus salt in the wastewater and convert it into essential nucle- ic acids, proteins, carbohydrates, and lipids, etc., or can change the pH of the biogas slurry to increase dissolved oxygen to cause phosphate precipitation. Removing the antibiotics from the biogas slurry by the microalgae is achieved in two ways: adsorption and biodegradation. The adsorption efficiency is generally not more than 10%. Heterotrophic metabolism is a main removal way, and has the removal efficiency of 50-90% for the antibiotics in the biogas slurry.
The bio-oil is a renewable and environmentally-friendly fuel.
Raw materials for production change from a first generation of liquid biofuels coming from edible raw materials such as corn, soybean, and sugarcane, to a second generation of biofuels coming from inedible raw materials such as Jatropha, miscanthus, and switchgrass, to microalgae now. Microalgae has been determined as a raw material for industrial-scale production of bio-oil. The mi- croalgae is rich in species, grows and reproduces fast, and has higher photosynthetic efficiency that other energy crops, and will be the most suitable alternative of fossil fuels in the future.
The present invention provides a method for co-producing me- thane and bio-oil by coupling anaerobic digestion of domestic wastewater with microalgae cultivation, which has both a function of domestic wastewater treatment and a function of microalgae cul- tivation. The entire system is self-sufficient in energy, which not only solves the problem in treatment of the domestic wastewater, but also produces the high-quality biomethane and pro-
duces the bio-oil through the microalgae cultivation system.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a flow chart of a method for co-producing methane 5 and bic-0il by coupling anaerobic digestion of domestic wastewater with microalgae cultivation of the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The model of an anaerobic digestion fermentation reactor in the embodiment of the present invention is UASB.
During the anaerobic fermentation reaction in the embodiment of the present invention, an organic load is 3.5-4.5 gvs/Led.
In the embodiment of the present invention, the mass content of water in biogas slurry is 30-40%.
A desulfurization tower in the embodiment of the present in- vention is a spray desulfurization tower.
The separation system in the embodiment of the present inven- tion separates CO: and methane through a PDMS/PEI composite film.
In the embodiment of the present invention, combustion for power generation adopts a biogas internal combustion engine, an alternating-current generator, and a waste heat recovery device.
An oil-enriched microalgae cultivation system in the embodi- ment of the present invention adopts an open single-layer track- type photobioreactor. Agitation is mechanical agitation.
In the embodiment of the present invention, a volume concen- tration of CO: in biomethane is less than or equal to 2%.
In the embodiment of the present invention, the main composi- tions of bic-oil are C14-C22 long-chain fatty acids and triglycer- ides. At the same time, the bio-oil contains a large number of high value-added chemical substances: levoglucosan, levoglucosone, glycollic aldehyde, hydroxyacetone, methylol furfural, maltol, vanillin, furfural, oligosaccharides, etc.
In the embodiment of the present invention, a carbalkoxy of the long-chain fatty acid of the bio-oil has a heat value of 40-50
MJ/kg.
In the embodiment of the present invention, during aeration, a pressure of introduced air is 0.1-0.5 MPa, and an air flow rate is 0.3-0.6 in accordance with a volume ratio of the air introduced per minute to diluted biogas slurry.
The yield of the biogas in the embodiment of the present in- vention is 75-85%.
Embodiment 1
The flow is as shown in FIG. 1.
Domestic wastewater is pretreated to remove suspended mat- ters, thus preparing pretreated wastewater. The pretreatment means that the domestic wastewater passes through a grating, then flows through a settling pit and a settling basin, and is then dis- charged, so that the suspended matters in the domestic wastewater are removed.
The pretreated wastewater is introduced into an anaercbic di- gestion fermentation reactor for anaerobic digestion fermentation reaction to produce biogas and biogas slurry. The anaerobic diges- tion fermentation reaction is carried out at a temperature of 40°C for 8 h. The organic matter content of the biogas slurry is less than that of the pretreated wastewater by 45% or above.
The biogas is introduced into a desulfurizing tower for puri- fication and desulfurization, and is then dried, thus forming pu- rified bicgas. The purification and desulfurization mean removing
H;S in the biogas, and the drying means removing water vapor from the biogas. One part of the purified biogas is used for combustion for power generation, and the other part is introduced into a sep- aration system to separate CO: and biomethane; the CO, serving as a gas fertilizer enters an oil-enriched microalgae cultivation sys- tem, and CO: generated by the combustion for power generation and serving as a gas fertilizer enters the oil-enriched microalgae cultivation system; the combustion for power generation supplies electric energy to a light source; the light source irradiates the oil-enriched microalgae cultivation system. A volume concentration of CH4 in the biomethane is 87%. Waste heat of the combustion for power generation is used for heating and thermal insulation of the anaerobic digestion fermentation reaction. The purified biogas in- troduced into the separation system accounts for 60% of all the purified biogas.
Water is added into the biogas slurry for dilution, and the adding amount of the water is 8 times the mass of the biogas slur- ry to form diluted biogas slurry; trichloroisocyanuric acid is added into the diluted biogas slurry for agitation and steriliza- tion treatment for 14 h, and the concentration of the trichloroi- socyanuric acid in the diluted biogas slurry is 15 mg/L; an aera- tion system is used to perform aeration treatment with air for 15 h; then a sodium carbonate solution is added to adjust a pH value to 7.5, thus preparing pretreated biogas slurry; and the concen- tration of the sodium carbonate solution is 2 mol/L.
The pretreated biogas slurry is delivered into the oil- enriched microalgae cultivation system for oil-enriched microalgae cultivation for 36 h under the gas fertilizer and the light source, thus producing oil-enriched microalgae.
The oil-enriched microalgae is squeezed with a screw press to obtain bio-oil, and remaining algae residues is returned to the anaerobic digestion fermentation reactor for anaerobic digestion fermentation reaction together with the pretreated wastewater.
Embodiment 2
A difference between the method and Embodiment 1 is as fol- lows: (1) The anaerobic digestion fermentation reaction is carried out at a temperature of 35°C for 10 h. {2} The volume concentration of CH: in the biomethane is 86%, and the purified biogas introduced into the separation system ac- counts for 55% of all the purified biogas. (3) The adding amount of the water is 5 times the mass of the biogas slurry; the concentration of the trichloroisocyanuric acid in the diluted biogas slurry is 12 mg/L, and the sterilization treatment is carried out for 12 h; the aeration treatment is car- ried out for 18 h; the pH value is adjusted to 7.2; and the con- centration of the sodium carbonate solution is 1 mol/L. {4) The oil-enriched microalgae cultivation is carried out for 30 h.
Embodiment 3
A difference between the method and Embodiment 1 is as fol- lows: (1) The anaerobic digestion fermentation reaction is carried out at a temperature of 30°C for 12 h.
(2) The volume concentration of CH; in the biomethane is 88%, and the purified biogas introduced into the separation system ac- counts for 65% of all the purified biogas.
(3) The adding amount of the water is 10 times the mass of the biogas slurry; the concentration of the trichloroisocyanuric acid in the diluted biogas slurry is 18 mg/L, and the steriliza- tion treatment is carried out for 16 h; the aeration treatment is carried out for 17 h; the pH value is adjusted to 7.0; and the concentration of the sodium carbonate solution is 3 mol/L.
(4) The oil-enriched microalgae cultivation is carried out for 24 h.

Claims (9)

CONCLUSIESCONCLUSIONS 1. Werkwijze voor het co-produceren van methaan en bio-olie door het koppelen van anaërobe digestie van huishoudelijk afvalwater met microalgenteelt, met het kenmerk, dat de werkwijze de volgende stappen omvat: (1) voorbehandeling van huishoudelijk afvalwater om gesuspendeerde materialen te verwijderen, waardoor voorbehandeld afvalwater wordt verkregen; (2) toevoer van het voorbehandelde afvalwater in een anaërobe di- gestieve fermentatiereactor voor anaërobe digestieve fermentatie- reactie, waardoor biogas en biogassuspensie wordt geproduceerd; (3) toevoer van het biogas in een ontzwavelingstoren voor zuive- ring en ontzwaveling, en vervolgens het drogen van het biogas om gezuiverd biogas te vormen: een deel van het gezuiverde biogas wordt gebruikt voor verbranding voor stroomopwekking, en het ande- re deel wordt toegevoerd in een scheidingssysteem om CO2 en biome- thaan te scheiden; de CO2 die als gasmeststof dient, komt een olie-verrijkt microalgenteeltsysteem binnen en CO2 die is gegene- reerd door de verbranding voor stroomopwekking en die dient als een gasmeststof komt het olie-verrijkte microalgenteeltsysteem binnen; de verbranding voor stroomopwekking levert elektrische energie aan een lichtbron; de lichtbron bestraalt het olie- verrijkte microalgenteeltsysteem; (4) toevoeging van water aan de biogassuspensie voor verdunning om verdunde biogas suspensie te vormen; toevoeging van trichloor iso- cyanurinezuur aan de verdunde biogas suspensie voor sterilisatie- behandeling; gebruik van een beluchtingssysteem om een beluchtingsbehandeling met lucht uit te voeren; vervolgens toevoe- ging van een natriumcarbonaatoplossing om een pH-waarde aan te passen aan 7,0 tot 7,5, waardoor voorbehandelde biogas suspensie wordt verkregen; (5) het leveren van de voorbehandelde biogas suspensie in het olie-verrijkte microalgenteeltsysteem voor olie-verrijkte microal- genteelt onder de gasmeststof en de lichtbron, voor het produceren van de olie-verrijkte microalgen; enA method for co-producing methane and bio-oil by coupling anaerobic digestion of domestic waste water with microalgae culture, characterized in that the method comprises the following steps: (1) pre-treatment of domestic waste water to remove suspended materials , resulting in pre-treated waste water; (2) feeding the pretreated waste water into an anaerobic digestive fermentation reactor for anaerobic digestive fermentation reaction, thereby producing biogas and biogas slurry; (3) feeding the biogas into a desulfurization tower for purification and desulfurization, and then drying the biogas to form purified biogas: part of the purified biogas is used for combustion for power generation, and the other part is fed into a separation system to separate CO2 and biomethane; the CO2 which serves as a gas fertilizer enters an oil-enriched microalgae cultivation system, and CO2 generated by the combustion for power generation and which serves as a gas fertilizer enters the oil-enriched microalgae cultivation system; the combustion for power generation provides electrical energy to a light source; the light source irradiates the oil-enriched microalgae cultivation system; (4) adding water to the biogas slurry for dilution to form diluted biogas slurry; addition of trichloro isocyanuric acid to the diluted biogas suspension for sterilization treatment; use of an aeration system to perform an aeration treatment with air; then adding a sodium carbonate solution to adjust a pH value to 7.0 to 7.5, thereby obtaining pretreated biogas slurry; (5) supplying the pretreated biogas slurry into the oil-enriched microalgae cultivation system for oil-enriched microalgae cultivation under the gas fertilizer and the light source, to produce the oil-enriched microalgae; and (6) het uitknijpen van de olie-verrijkte microalgen om bio-olie te verkrijgen en het terugvoeren van de resterende algenresiduen naar de anaërobe digestieve fermentatiereactor voor anaërobe digestieve fermentatiereactie samen met het voorbehandelde afvalwater.(6) squeezing the oil-enriched microalgae to obtain bio-oil and returning the remaining algal residues to the anaerobic digestive fermentation reactor for anaerobic digestive fermentation reaction along with the pretreated waste water. 2. Werkwijze voor het co-produceren van het methaan en de bio-olie door de anaërobe digestie van het huishoudelijke afvalwater te koppelen met de microalgenteelt volgens conclusie 1, met het ken- merk, dat in de stap (2), de anaërobe digestieve fermentatiereac- tie wordt uitgevoerd bij een temperatuur van 30 tot 40 °C geduren- de ten minste 8 uur.Method for co-producing the methane and the bio-oil by coupling the anaerobic digestion of the domestic waste water with the microalgae culture according to claim 1, characterized in that in the step (2), the anaerobic digestive fermentation reaction is carried out at a temperature of 30 to 40°C for at least 8 hours. 3. Werkwijze voor het co-produceren van het methaan en de bio-olie door de anaërobe digestie van het huishoudelijke afvalwater te koppelen aan de microalgenteelt volgens conclusie 1, met het ken- merk, dat in de stap (3), een hoofdfunctionele component van het scheidingssysteem een polydimethylsiloxaan (PDMS) /polyetherimide (PEI) composietfilm is.A method for co-producing the methane and the bio-oil by coupling the anaerobic digestion of the domestic waste water to the microalgae culture according to claim 1, characterized in that in the step (3), a main functional component of the separation system is a polydimethylsiloxane (PDMS)/polyetherimide (PEI) composite film. 4. Werkwijze voor het co-produceren van het methaan en de bio-olie door de anaërobe digestie van het huishoudelijke afvalwater te koppelen met de microalgenteelt volgens conclusie 1, met het ken- merk, dat in de stap (3), een volumeconcentratie van CH4 in het biomethaan groter is dan of gelijk is aan 853.Method for co-producing the methane and the bio-oil by coupling the anaerobic digestion of the domestic waste water with the microalgae culture according to claim 1, characterized in that in the step (3), a volume concentration of CH4 in the biomethane is greater than or equal to 853. 5. Werkwijze voor het co-produceren van het methaan en de bio-olie door de anaërobe digestie van het huishoudelijke afvalwater te koppelen aan de microalgenteelt volgens conclusie 1, met het ken- merk, dat in de stap (3), het gezuiverde biogas dat is geïntrodu- ceerd in het scheidingssysteem, goed is voor 55 tot 65% van al het gezuiverde biogas.A method for co-producing the methane and the bio-oil by coupling the anaerobic digestion of the domestic waste water to the microalgae culture according to claim 1, characterized in that in step (3), the purified biogas introduced into the separation system accounts for 55 to 65% of all treated biogas. 6. Werkwijze voor het co-produceren van het methaan en de bio-olie door de anaërobe digestie van het huishoudelijke afvalwater te koppelen aan de microalgenteelt volgens conclusie 1, met het ken- merk, dat in de stap (4), de sterilisatiebehandeling wordt uitge- voerd gedurende ten minste 12 uur.A method for co-producing the methane and the bio-oil by coupling the anaerobic digestion of the domestic waste water to the microalgae culture according to claim 1, characterized in that in step (4), the sterilization treatment is performed for at least 12 hours. 7. Werkwijze voor het co-produceren van het methaan en de bio-olie door de anaërobe digestie van het huishoudelijke afvalwater te koppelen aan de microalgenteelt volgens conclusie 1, met het ken- merk, dat in de stap (4), de beluchtingsbehandeling wordt uitge- voerd gedurende ten minste 12 uur.A method for co-producing the methane and the bio-oil by coupling the anaerobic digestion of the domestic wastewater with the microalgae culture according to claim 1, characterized in that in step (4), the aeration treatment is performed for at least 12 hours. 8. Werkwijze voor het co-produceren van het methaan en de bio-olie door de anaërobe digestie van het huishoudelijke afvalwater te koppelen aan de microalgenteelt volgens conclusie 1, met het ken- merk, dat in de stap (4), de concentratie van het trichloor isocy- anurinezuur in de verdunde biogasslurry 12 tot 18 mg/l is.A method for co-producing the methane and the bio-oil by coupling the anaerobic digestion of the domestic waste water to the microalgae culture according to claim 1, characterized in that in the step (4), the concentration of the trichloro isocyanuric acid in the diluted biogas slurry is 12 to 18 mg/l. 9. Werkwijze voor het co-produceren van het methaan en de bio-olie door de anaërobe digestie van het huishoudelijke afvalwater te koppelen aan de microalgenteelt volgens conclusie 1, met het ken- merk, dat in de stap (4), de toevoeging van het water 4 tot 10 keer de massa van de biogas slurry is.A method for co-producing the methane and the bio-oil by coupling the anaerobic digestion of the domestic waste water to the microalgae culture according to claim 1, characterized in that in the step (4), the addition of the water is 4 to 10 times the mass of the biogas slurry.
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