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WO2008038860A1 - Procédé de production du méthane à partir de déchets d'olives - Google Patents

Procédé de production du méthane à partir de déchets d'olives Download PDF

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Publication number
WO2008038860A1
WO2008038860A1 PCT/KR2006/005503 KR2006005503W WO2008038860A1 WO 2008038860 A1 WO2008038860 A1 WO 2008038860A1 KR 2006005503 W KR2006005503 W KR 2006005503W WO 2008038860 A1 WO2008038860 A1 WO 2008038860A1
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WO
WIPO (PCT)
Prior art keywords
sludge
secondary sludge
olive mill
mill wastewater
anaerobic
Prior art date
Application number
PCT/KR2006/005503
Other languages
English (en)
Inventor
Eui-So Choi
Original Assignee
Greentech Environment Consulting Co., Ltd
Kunhwa Consulting & Engineering Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Greentech Environment Consulting Co., Ltd, Kunhwa Consulting & Engineering Co., Ltd filed Critical Greentech Environment Consulting Co., Ltd
Publication of WO2008038860A1 publication Critical patent/WO2008038860A1/fr
Priority to TN2009000050A priority Critical patent/TN2009000050A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
    • C02F2103/322—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters from vegetable oil production, e.g. olive oil production
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/20—Capture or disposal of greenhouse gases of methane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Definitions

  • the present invention relates to a method for producing methane gas from olive mill wastewater, and more specifically to a method for producing methane gas from olive mill wastewater wherein olive mill wastewater can be anaerobically digested without pretreatment, methane gas can be produced in high yield, and olive mill wastewater and secondary sludge can be simultaneously treated.
  • the Mediterranean countries produce about 98% of olive oil demand in the world which is about 1.77 million tons per year. Since olive mill wastewater is produced in an amount of about two times the amount of olive oil, the Mediterranean region is responsible for the production of about 3.50 million tons of olive mill wastewater a year. Spain makes up the largest portion (602,000 tons) of the world production of olive oil. Italy (451,000 tons), Greece (332,000 tons), Tunisia (173,000 tons), Turkey (92,000 tons), Iran (81,000 tons), Sydney (46,000 tons) and other countries, including Australia, U.S., and Lebanon, share the world production of olive oil. These olive producing countries have a desert climate characterized by low annual rainfall and relatively high temperature. Olive oil produced from these countries is exported to all countries of the world. The production of olive oil in these countries is expected to gradually increase.
  • Olive oil is produced by pressing the olive fruit under high pressure to extract oil components and water and collecting the oil components only by centrifugation. Solid waste obtained during production of olive oil is used as feed for camels and sheep, causing no waste problem. However, the treatment of olive mill wastewater, which is the major waste produced from the extraction of olive oil, becomes a serious problem. Olive mill wastewater represents 150,000 mg/L organics and 10,000 mg/L polyphenols, as calculated on the basis of CODcr.
  • a method for producing methane gas from olive mill wastewater comprising the steps of (a) obtaining secondary sludge containing nitrogen sources from a municipal sewage treatment plant and selectively culturing the secondary sludge under anaerobic conditions to produce concentrated anaerobic microbial sludge, (b) feeding another secondary sludge containing nitrogen sources obtained from the municipal sewage treatment plant and olive mill wastewater to the concentrated anaerobic microbial sludge, followed by mixing, and (c) i anaerobically digesting the mixture to produce methane gas and effluent .
  • step (a) may be carried out for 20 to 32 days.
  • the secondary sludge used in steps (a) and (b) may have a total nitrogen content of 1.5 to 15 wt%, based on the solids content of the secondary sludge.
  • the method may further comprise the step of, prior to step (b) , stirring the secondary sludge containing nitrogen sources obtained from the municipal sewage treatment plant and the olive mill wastewater.
  • the method may further comprise the step of, after step (c) , returning a portion of the effluent to the mixture of the secondary sludge containing nitrogen sources obtained from the municipal sewage treatment plant and the olive mill wastewater.
  • the secondary sludge used in steps (a) and (b) may be liquid or dried sludge.
  • step (a) and (b) may be liquid or dried sludge.
  • the secondary sludge containing nitrogen sources and the olive mill wastewater may be fed in a volume ratio ranging from 8.5 : 1 to 10.5 : 1.
  • steps (a) , (b) and (c) may be carried out in a sequencing batch reaction process .
  • the anaerobic digestion (step (c) ) may be performed at a hydraulic retention time (HRT) of 8 to 12 days, a mixed liquor suspended solid (MLSS) of 20,000 to 30,000 mg/L, a pH of 7 to 8 and a temperature of 25 to 35°C.
  • HRT hydraulic retention time
  • MLSS mixed liquor suspended solid
  • FIG. 1 is a process chart illustrating a method for producing methane gas from olive mill wastewater according to an embodiment of the present invention
  • FIG. 2 is a graph showing the amounts of methane gas produced during operating periods of anaerobic digestion in a method for producing methane gas from olive mill wastewater according to an embodiment of the present invention.
  • FIG. 1 A method for producing methane gas from olive mill wastewater according to an embodiment of the present invention is illustrated in FIG. 1.
  • the method of the present invention comprises the steps of (a) obtaining secondary sludge containing nitrogen sources from a municipal sewage treatment plant and selectively culturing the secondary sludge under anaerobic conditions to produce concentrated anaerobic microbial sludge, (b) feeding another secondary sludge containing nitrogen sources obtained from the municipal sewage treatment plant and olive mill wastewater to the concentrated anaerobic microbial sludge, followed by mixing, and (c) anaerobically digesting the mixture to produce methane gas and effluent .
  • Municipal sewage treatment largely involves the following steps: (1) filtration and removal of relatively large solids contained in wastewater using a screen; (2) sedimentation and removal of grit, which is a mixture of sand and dirt, in a sand basin; (3) sedimentation and removal of solid substances that can be settled in the wastewater in a primary sedimentation basin; (4) assimilation of microbial cells from organic substances that are not settled in the primary sedimentation basin in an aeration tank, which serves to facilitate the sedimentation of the assimilated microbial cells; (5) sedimentation and removal of the microbial cells in a secondary sedimentation basin; and (6) sterilization by feeding chlorine to the secondary sedimentation basin to kill pathogenic microbes.
  • Sludge settled in the secondary sedimentation basin is referred to as 'secondary sludge' and is substantially composed of microbes.
  • Secondary sludge obtained during treatment of activated sludge is also referred to as 'activated sludge' .
  • the secondary sludge is substantially composed of microbes, it can be approximated by CsH 7 ⁇ 2 N. That is, since the secondary sludge has a high nitrogen content, it can act as a nitrogen source for anaerobic bacteria upon anaerobic digestion. Further, various microbes present in the secondary sludge can act as seed bacteria for anaerobic reactions.
  • the secondary sludge used in step (a) is essentially composed of aerobic bacteria or facultative bacteria (i.e. microbes that can grow with or without oxygen) . Facultative and anaerobic organic acid producing bacteria and methane producing bacteria grow in the secondary sludge by anaerobic digestion, which occurs in a state in which no air is introduced.
  • This growth of the bacteria which is an ecological succession, utilizes a process wherein microbes suitable for growth under anaerobic environments become dominant species. That is, aerobic bacteria are dominant species in the secondary sludge obtained from the municipal sewage treatment plant, but anaerobic bacteria suitable for growth under anaerobic conditions become dominant species when anaerobic conditions are maintained by stopping the supply of oxygen by aeration.
  • Anaerobic digestion occurs by the action of various kinds of bacteria. Bacteria involved in anaerobic digestion are largely divided into organic acid producing bacteria and methane producing bacteria. Facultative and anaerobic organic acid producing bacteria degrade organic substances to form corresponding organic acids and alcohols, along with small amounts of carbon dioxide (CO 2 ) gas, acetone, hydrogen (H 2 ) gas, etc. This reaction is called a ⁇ first digestion step' . Methane producing bacteria, which are classified into four genera, i.e.
  • Methanobacterium, Methanococcus, Methanosarcina and Methanospirillium in terms of morphology, degrade organic acids formed in the first digestion step to form gaseous substances, including methane (CH 4 ) and carbon dioxide (CO 2 ) , along with small amounts of other gases, such as ammonia (NH 3 ) gas, hydrogen sulfide (H 2 S) and mercaptan.
  • gases such as ammonia (NH 3 ) gas, hydrogen sulfide (H 2 S) and mercaptan.
  • An appropriate activity of organic acid producing bacteria and methane producing bacteria is required to convert organic substances to corresponding gases. That is, organic acids as nutrients necessary in a subsequent second digestion step are formed in the ' first digestion step, while the organic acids are degraded in a second digestion step to prevent pH reduction arising from the accumulation of the organic acids.
  • step (a) secondary sludge containing nitrogen sources obtained from a municipal sewage treatment plant is selectively cultured to produce concentrated anaerobic microbial sludge, i.e. concentrated sludge of methane producing bacteria, etc.
  • anaerobic microbes such as methane producing bacteria, become dominant species to allow anaerobic digestion to sufficiently occur in step (c) , resulting in an increase in the amount of methane gas produced in step (c) .
  • olive mill wastewater is characterized by the following physical properties: pH of 4.5-5.9, chemical oxygen demand (COD) of 40-200 g/L, biochemical oxygen demand (BOD) of 20-110 g/L, phosphorus (P) of 800-1,100 mg/L, potassium (K) of 7,200 mg/L, calcium (Ca) of 700 mg/L, magnesium (Mg) of 400 mg/L, sodium (Na) of 900 mg/L, iron (Fe) of 70 mg/L, chlorine (Cl) of 300 mg/L, total sugar of 1-8 wt% (% dry matter), organic nitrogen of 0.28-2 wt% (% dry matter), organic acids of 0.5-1 wt% (% dry matter), polyalcohols of 1-1.5 wt% (% dry matter), tannins 0.37-1 wt% (% dry matter), polyphenols of 0.5-2.4 wt% (% dry matter), grease of 0.03-1 wt% (% dry matter) .
  • COD chemical oxygen demand
  • BOD bio
  • olive mill wastewater contains 150 g/L CODcr, which represents that carbon necessary for the growth of anaerobic microbes is present in a sufficient amount, and 0.16 wt% (% dry matter) of organic nitrogen, which represents lack of nitrogen.
  • olive mill wastewater contains large amounts (10 g/L) of toxic polyphenols (including catechol, 4-hydoxybenzoic acid, 2- (3, 4-dihydroxy) phenylethanol, 3, 4-dihydroxyphenyl acetic acid, and so forth) .
  • step (b) secondary sludge containing the nitrogen sources obtained from a municipal sewage treatment plant, together with olive mill wastewater, fed to the concentrated anaerobic microbial sludge enables the supply of nitrogen, which is necessary for the growth of the anaerobic microbes but is insufficiently present in the olive mill wastewater.
  • the toxicity of the polyphenols can be inhibited i) by diluting the high-concentration polyphenols with a large amount of moisture present in the secondary- sludge containing the nitrogen sources obtained from the municipal sewage treatment plant to a concentration of the polyphenols that can be sufficiently degraded by the microbes, ii) by degrading the polyphenols by the action of denitrifying microbes or sulfate-reducing bacteria present in the secondary sludge, or iii) by a combination of both functions of i) and ii) .
  • Various microbes present in the secondary sludge from the municipal sewage treatment plant can act as seed bacteria for anaerobic digestion.
  • the secondary sludge containing nitrogen sources obtained from the municipal sewage treatment plant can be used for anaerobic digestion of the olive mill wastewater.
  • the secondary sludge containing nitrogen sources obtained from the municipal sewage treatment plant can be degraded by anaerobic digestion, it can be treated by the method of the present invention.
  • secondary sludge which is the waste produced from a municipal sewage treatment plant, and olive mill wastewater can be simultaneously treated.
  • olive mill wastewater can be anaerobically digested by the method of the present invention, which enables the production of methane gas from olive mill wastewater.
  • Step (a) may be carried out for 20 to 32 days. If step
  • step (a) is carried out for less than 20 days, there may be the danger that growth of methane producing bacteria is insufficient for the production of methane gas by anaerobic digestion of the olive mill wastewater. Meanwhile, if step (a) is carried out for less than 20 days, there may be the danger that growth of methane producing bacteria is insufficient for the production of methane gas by anaerobic digestion of the olive mill wastewater. Meanwhile, if step (a) is carried out for less than 20 days, there may be the danger that growth of methane producing bacteria is insufficient for the production of methane gas by anaerobic digestion of the olive mill wastewater. Meanwhile, if step (a) is carried out for less than 20 days, there may be the danger that growth of methane producing bacteria is insufficient for the production of methane gas by anaerobic digestion of the olive mill wastewater. Meanwhile, if step (a) is carried out for less than 20 days, there may be the danger that growth of methane producing bacteria is insufficient for the production of methane gas by
  • (a) is carried out for more than 32 days, the time required for the production of methane gas is unnecessarily long, thus adversely affecting the operating conditions.
  • the secondary sludge used in steps (a) and (b) may have a total nitrogen content of 1.5 to 15 wt%, based on the solids content of the secondary sludge.
  • a total nitrogen content lower than 1.5 wt% or greater than 15 wt% of the secondary sludge may be unsuitable for the growth of the anaerobic microbes .
  • the method of the present invention may further comprise the step of, prior to step (b) , stirring the secondary sludge containing nitrogen sources obtained from the municipal sewage treatment plant and the olive mill wastewater.
  • the method of the present invention may further comprise the step of, after step (c) , returning a portion of the effluent to the mixture of the secondary sludge containing nitrogen sources obtained from the municipal sewage treatment plant and the olive mill wastewater. Since the effluent undergoes anaerobic digestion, it contains various organic substances and microbes necessary for anaerobic digestion. Accordingly, the return of the effluent assists in the anaerobic digestion of the olive mill wastewater.
  • the secondary sludge used in steps (a) and (b) may be liquid or dried sludge. Since common secondary sludge has a moisture content as high as 95 to 99%, dried sludge may be preferably used in terms of convenience of use.
  • the dried sludge is prepared by drying sludge on a sludge drying bed. Specifically, the dried sludge means sludge in which 20-90% of the initial moisture content is removed.
  • the secondary sludge containing nitrogen sources and the olive mill wastewater may be fed in a volume ratio ranging from 8.5 : 1 to 10.5 : 1.
  • the secondary sludge is used in an amount of less than 8.5 parts by volume per one part by volume of the olive mill wastewater, i.e. the concentration of the olive mill wastewater is relatively high, there is the risk that growth of the anaerobic microbes is limited.
  • the secondary sludge is used in an amount of more than 10.5 parts by volume per one part by volume of the olive mill wastewater, i.e. the olive mill wastewater is excessively diluted, growth of the anaerobic microbes may be limited due to lack of carbon sources necessary for the growth of the anaerobic microbes and the reaction tank must be larger in volume than is necessary.
  • Steps (a) , (b) and (c) may be carried out in a sequencing batch reaction process.
  • the sequencing batch reaction process basically consists of the following consecutive steps: filling of sewage wastewater, reaction, settlement and drawing. One or more rest periods may be provided between the respective steps. That is, secondary sludge containing nitrogen sources obtained from a municipal sewage treatment plant is filled in a sequencing batch ' reaction tank where satisfactory anaerobic conditions are created in the absence of oxygen, as in step (a) of the method according to the present invention; stirring is conducted for reaction; settling occurs after passage of a specified time period; supernatant is drawn as an effluent; and methane gas is collected. This series of consecutive steps is carried out in the sequencing batch reaction tank.
  • the hydraulic retention time (HRT) of the secondary sludge obtained from the municipal sewage treatment plant is maintained constant and concentrated sludge (i.e. concentrated anaerobic microbial sludge) in which anaerobic microbes, such as methane producing bacteria, become dominant species can be produced.
  • concentrated sludge i.e. concentrated anaerobic microbial sludge
  • anaerobic microbes such as methane producing bacteria
  • step (b) i.e. feeding of the secondary sludge containing nitrogen sources obtained from the municipal sewage treatment plant and the olive mill wastewater to the concentrated anaerobic microbial sludge, followed by mixing
  • step (c) i.e. anaerobic digestion of the mixture
  • feeding of specified amounts of the secondary sludge containing nitrogen sources obtained from the municipal sewage treatment plant and the olive mill wastewater, anaerobic reactions with the solution for anaerobic digestion i.e.
  • the concentrated anaerobic microbial sludge settling of the anaerobic microbes after the anaerobic reactions and drawing of supernatant (effluent) after the settling consecutively occur in one reaction tank.
  • the stream of the reaction tank is maintained at a constant level and the number of the anaerobic microbes, such as methane producing bacteria, settled in the reaction tank is increased, so that the amount of methane gas produced in the reaction tank can be increased to a permissible level of the system.
  • the anaerobic digestion can be performed at a hydraulic retention time (HRT) of 8 to 12 days, a mixed liquor suspended solid (MLSS) of 20,00 ' 0 to 30,000 mg/L, a pH of 7 to 8 and a temperature of 25 to 35°C.
  • HRT hydraulic retention time
  • MLSS mixed liquor suspended solid
  • the operating conditions for the anaerobic digestion in step (c) are also applicable to the production of the concentrated anaerobic microbial sludge by selective culturing of the secondary sludge obtained from the municipal sewage treatment plant under anaerobic conditions .
  • the hydraulic retention time is less than 8 days, the time period required for the anaerobic digestion is too short, causing the risk that the olive mill wastewater may be insufficiently degraded. Meanwhile, when the hydraulic retention time is more than 12 days, the overall operating period may be unnecessarily lengthened.
  • the mixed liquor suspended solid (MLSS) When the mixed liquor suspended solid (MLSS) is less than 20,000 mg/L, the number of the anaerobic microbes, such as methane producing bacteria, is small, causing the danger that the anaerobic digestion may insufficiently occur. Meanwhile, when the mixed liquor suspended solid (MLSS) is exceeds 30,000 mg/L, the number of the anaerobic microbes, such as methane producing bacteria, is excessively large, thus negatively affecting the growth of the microbes .
  • a pH lower than 7 or higher than 8 may make the growth of the anaerobic microbes, such as methane producing bacteria, difficult because the anaerobic microbes, such as methane producing bacteria, are sensitive to a pH variation.
  • An optimum pH range for the anaerobic digestion is required to increase the production of methane gas.
  • a temperature lower than 25°C or higher than 35°C may also make the growth of the anaerobic microbes, such as methane producing bacteria, difficult.
  • Sewage sludge (secondary active sludge collected from a Jungrang wastewater treatment plant, Seoul, Korea) was filled at a rate of 570 mL/day in a sequencing batch anaerobic digester.
  • the anaerobic digester was operated at a hydraulic retention time (HRT) of 10 days with a 24 hour cycle for 28 days .
  • the sewage sludge was selectively cultured under anaerobic conditions to produce concentrated anaerobic microbial sludge.
  • the filling of the sewage sludge was conducted for 12 hours while the sequencing batch anaerobic digester was mixing. The mixing was continued for 6 hours after the filling was stopped, followed by settling for 6 hours. The filling was conducted for 30 minutes and stopped for 2.5 hours.
  • the amount of methane gas evolved from the sequencing batch anaerobic digester was measured. 29 to 50 days after the operation was initiated, 30 ml/d of olive mill wastewater was mixed with 570 mL/d of another sewage sludge collected from the Jungrang wastewater treatment plant in a stirring tank, and then the mixture was fed into the sequencing batch anaerobic digester using a pump to react the mixture with the concentrated anaerobic microbial sludge.
  • the anaerobic digester was operated at a hydraulic retention time (HRT) of 10 days with a 24 hour cycle. The feeding of the mixture was conducted for 12 hours while the sequencing batch anaerobic digester was mixing.
  • HRT hydraulic retention time
  • the mixing was continued for 6 hours after the feeding was stopped, followed by settling for ⁇ hours.
  • the feeding of the mixture of the olive mill wastewater and the sewage sludge was conducted for 30 minutes and stopped for 2.5 hours . This feeding procedure was repeated.
  • the amount of the olive mill wastewater fed was increased to 40 ml/d at 51 to 70 days after the operation was initiated, and increased to 60 ml/d at 71 to 90 days after the operation was initiated.
  • the amounts of the sludge and the olive mill wastewater fed were 570 mL/d and 60 mL/d (9.5 : 1 (v/v) ) , respectively.
  • the operating conditions in the respective periods are shown in Table 1.
  • the sequencing batch anaerobic digester was operated at a mixed liquor suspended solid (MLSS) of 24,000 mg/L, a pH of 7.6 and a temperature of 35 0 C.
  • the analytical results show that the gases include, on average, 65 vol% of methane, 31 vol% of carbon dioxide, 3.6 vol% of hydrogen, 0.3 vol% of nitrogen and 0.06 vol% of hydrogen sulfide. Based on these results, it was concluded that methane gas could be produced in high yield by the method of the present invention.
  • the amount of methane gas produced during the operating periods was measured daily by gas volumetric analysis. The results are shown in FIG. 2.
  • the amount of methane gas produced tended to be decreased at 20 days and 28 days after the operation was initiated. This tendency is believed to be due to the lack of organic substances, particularly carbon sources, by an increased number of methane producing bacteria.
  • FIG. 2 shows that methane gas was not produced any further at 50 and 70 days after the operation was initiated.
  • the amount of the olive mill wastewater was increased at the time points (50 and 70 days) to increase the amount of methane gas produced.
  • FIG. 2 also shows that methane gas was stably produced after 90 days of the operation.
  • the method of the present invention provides the advantages that olive mill wastewater can be anaerobically digested without pretreatment, methane gas can be produced in high yield, and olive mill wastewater and secondary sludge can be simultaneously treated.
  • anaerobic digestion can be performed in one reaction tank, which is advantageous in terms of space reduction.
  • effluent obtained after anaerobic digestion is free of toxic substances, it can be used in agricultural applications .

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Microbiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Treatment Of Sludge (AREA)

Abstract

L'invention concerne un procédé de production du méthane à partir d'eau résiduaire du broyage des olives. Le procédé consiste à : (a) obtenir une boue secondaire contenant des sources d'azote à partir d'une installation de traitement des eaux d'égout municipales et mettre en culture sélectivement la boue secondaire dans des conditions anaérobies afin de produire une boue microbienne anaérobie concentrée; (b) amener une autre boue secondaire contenant des sources d'azote obtenues à partir de l'installation de traitement des eaux d'égout municipales et de l'eau résiduaire du broyage des olives jusqu'à la boue microbienne anaérobie concentrée, puis effectuer un mélange et (c) procéder à une digestion anaérobie du mélange afin d'obtenir le méthane et un effluent. Selon ce procédé, l'eau résiduaire du broyage des olives peut être soumise à la digestion anaérobie sans prétraitement, le méthane peut être produit à haut rendement et l'eau résiduaire du broyage des olives et la boue secondaire peuvent être traitées simultanément. De plus, la digestion anaérobie peut être effectuée dans une cuve de réaction, ce qui est avantageux en termes de réduction d'espace.
PCT/KR2006/005503 2006-09-11 2006-12-15 Procédé de production du méthane à partir de déchets d'olives WO2008038860A1 (fr)

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TN2009000050A TN2009000050A1 (en) 2006-09-11 2009-02-17 Production method of methane gas from olive mill waste

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KR20060093833A KR20080028247A (ko) 2006-09-26 2006-09-26 올리브폐액을 이용한 메탄가스생산방법
KR10-2006-0093833 2006-09-26

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KR100916154B1 (ko) * 2009-02-05 2009-09-08 임현지 유제품 제조시 발생하는 폐기물의 혐기성 처리방법
CN112960880A (zh) * 2021-03-12 2021-06-15 桂林理工大学 一种基于添加碳布提高厌氧共消化废油脂和污泥产甲烷的方法

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