EP2649011A1 - Procédé et installation de récupération et d'utilisation du méthane à partir d'un effluent liquide anaérobie - Google Patents

Procédé et installation de récupération et d'utilisation du méthane à partir d'un effluent liquide anaérobie

Info

Publication number
EP2649011A1
EP2649011A1 EP11805247.1A EP11805247A EP2649011A1 EP 2649011 A1 EP2649011 A1 EP 2649011A1 EP 11805247 A EP11805247 A EP 11805247A EP 2649011 A1 EP2649011 A1 EP 2649011A1
Authority
EP
European Patent Office
Prior art keywords
methane
effluent
gas phase
gas
reactor
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP11805247.1A
Other languages
German (de)
English (en)
Inventor
Jeroen v.d. Lubbe
Barry Heffernan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Veolia Water Solutions and Technologies Support SAS
Original Assignee
Veolia Water Solutions and Technologies Support SAS
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 Veolia Water Solutions and Technologies Support SAS filed Critical Veolia Water Solutions and Technologies Support SAS
Priority to EP11805247.1A priority Critical patent/EP2649011A1/fr
Publication of EP2649011A1 publication Critical patent/EP2649011A1/fr
Withdrawn legal-status Critical Current

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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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/10—Energy recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2900/00—Special features of, or arrangements for incinerators
    • F23G2900/50208—Biologic treatment before burning, e.g. biogas generation
    • 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
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/20—Sludge processing
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies

Definitions

  • the invention relates to a method for recovering methane from a liquid effluent from a reactor wherein a waste stream comprising one or more organic substances other than methane has been subjected to anaerobic degradation and to a reaction system for carrying out such a method.
  • Biological waste treatment uses active biomass (bacteria) to convert the0 pollutants (organic substances) to harmless components.
  • anaerobic treatment without oxygen
  • a consortia of anaerobic bacteria convert pollutants substantially to methane and carbon dioxide, which will end up in the biogas.
  • Anaerobic processes utilise anaerobic bacteria to convert pollutants in0 wastewater and other waste streams to biogas (a gas mixture mainly comprising
  • methane and carbon dioxide Part of the produced methane dissorbs from the liquid phase and is collected in dedicated gas collection devices or in the reactor headspace of closed reactors.
  • the dissolved methane concentration in a liquid effluent stream of a waste treatment process may in particular be saturated0 with methane; it is contemplated that in some circumstances the liquid effluent may even be oversaturated with dissolved methane.
  • the inventors contemplate that the dissolved methane concentration in a liquid effluent may be in the range of about 15-60 mg/1, depending on process conditions, such as reactor liquid height, operational pressure and liquid temperature.
  • process conditions such as reactor liquid height, operational pressure and liquid temperature.
  • waste water streams such as municipal sewage, this may account for up to about 40 % of the total methane production.
  • the inventors realised that the methane dissolved in the liquid effluent from anaerobic waste treatment process may be transferred to the atmosphere, where it is a far more potent green house gas than carbon dioxide. Thus, they realised that avoiding such transfer would be desirable in order to reduce carbon foot print of a process for anaerobically treating a waste stream.
  • the present invention relates to a method for recovering methane from a liquid effluent of a reactor wherein a waste stream comprising one or more organic substances has been subjected to an anaerobic degradation process in which reactor biogas, comprising methane, has been produced from said one or more organic substances, the liquid effluent comprising dissolved methane, the method comprising transferring dissolved methane from the effluent to a gas phase and using the methane to produce energy.
  • the present invention is directed to a reactor system for preparing biogas by anaerobic degradation of one or more organic substances, the system comprising a reactor, which reactor is provided with a biogas collection system and an outlet for biogas produced in the reactor, with effluent withdrawal means for withdrawing liquid effluent from the reactor, and with a methane gas-recovery unit for recovering methane gas from the liquid effluent, the methane gas-recovery unit comprising an inlet for the liquid effluent, which inlet at least during use is in fluid communication with the effluent withdrawal means, the methane gas-recovery unit further comprising an outlet for a gas phase comprising methane and an outlet for a liquid effluent.
  • a reactor system for preparing biogas by anaerobic degradation of one or more organic substances
  • the system comprising a reactor, which reactor is provided with a biogas collection system and an outlet for biogas produced in the reactor, with effluent withdrawal means for withdrawing liquid effl
  • the present invention provides an effective way to recover methane from the liquid effluent and at least substantially avoiding that the methane ends up in the atmosphere. This reduces the carbon footprint of the anaerobic degradation process.
  • the liquid effluent from which dissolved methane has been transferred to the gas phase in accordance with the invention comprises less than 15 mg/1 methane, preferably 2.5 mg/, or less, more preferably, 1.5 mg/1 or less.
  • Methane may be removed essentially completely (i.e. to a concentration below the detection limit). In practice, a detectible concentration may be present, e.g. of 0.1 mg/1 or more.
  • the methane may be recovered from the liquid effluent in such a manner that it can efficiently be used for energy production.
  • the increase in energy production is considerable, in particular 10 % or more, more in particular 20 % to 50 % - compared to a conventional anaerobic process wherein only biogas collected as a gas from/or within the reactor wherein the degradation takes place is used for energy production.
  • the removal of methane from the liquid effluent reduces the risk of explosion and/or risk of asphyxiation (the latter in particular in confined spaces), which may be important, e.g. in case the method of the invention is used as part of a water purification method. After all, if dissolved methane in aqueous liquid is allowed to accumulate in confined spaces (e.g. a sewer network) it may be a cause of explosions.
  • confined spaces e.g. a sewer network
  • GB-A 2 381 761 describes an apparatus and method to remove methane from trade waste such as leachate from landfill sites so that the processed liquid may be safely disposed of into a sewage system. It is not disclosed to recover methane from a reactor wherein a waste stream has been subjected to anaerobic degradation, nor is mentioned to recover energy from the removed methane. In particular, it is not suggested to use the described apparatus in such a way that the air-methane mixture that is obtained can be used as combustion-air.
  • the composition of the combustion fuel or the part thereof that is obtained by recovering methane from the liquid effluent may vary with in wide ranges depending on the specific method of methane recovery and - if the recovery comprises venting with (ambient) air, on the applied ventilation rate.
  • the methane concentration in the gas phase that is obtained may be below the lower explosion limit for methane in the gas phase (for a methane-air mixture 5. 1 vol % at 20 °C or be at least at the lower explosion limit (preferably above the upper explosion limit of 15 vol%) for methane in the gas phase.
  • the gas phase comprising methane may in particular be used as combustion air (when a technique making use of air is used to recover the dissolved methane).
  • gas phase comprising methane in a concentration above the lower explosion limit, preferably above the upper explosion limit may be used (as part of) combustion fuel for producing energy.
  • 'combustion air means a gas phase comprising oxygen in a suitable concentration to combust the methane collected in the reactor, nitrogen and optionally methane and carbon dioxide, which methane is generally present at a concentration below the lower explosion limit.
  • combustion air may comprise 0-5 vol % methane, 0- 10 vol % carbon dioxide, 60-80 vol % nitrogen, 10-21 vol % oxygen. Together, these gases usually form more than 95 vol %.
  • the balance - if any - is usually essentially formed by one or more gases that are usually present in air (notably one or more noble gases, water vapour, hydrogen sulphide gas).
  • 'combustion fuel means a gas phase comprising methane in a concentration above the lower explosion limit that is to be combusted.
  • the combustion fuel may be biogas (collected as a gas phase in the anaerobic reactor, typically with a methane fraction comprising at least 50 vol % CH4, which biogas may have been conditioned, in particular which may have been enriched in methane, for instance by removal of water, carbon dioxide and/or other undesired components.
  • a recovered gas phase comprising methane that has been transferred from the liquid effluent in accordance with the invention, which gas phase comprises methane in a concentration above the upper explosion limit may be used as combustion fuel.
  • the part of the combustion fuel obtained by recovering methane from the liquid effluent comprises, 15 - 30 vol % methane, 5 - 30 vol% carbon dioxide, up to 65 vol % nitrogen and up to 18 vol % oxygen.
  • This part of the fuel is usually mixed with biogas directly obtained from the anaerobic reactor, before being combusted.
  • the part of the combustion fuel obtained may comprise more than 30 % methane, in particular 50-80 vol % methane, and more than 20 vol % carbon dioxide, in particular 20-50 vol % carbon dioxide.
  • the nitrogen concentration usually is 0-25 vol %.
  • the oxygen concentration usually is 0-5 vol %.
  • the waste stream may in particular be selected from the group of waste water streams, slurries, sludges, organic residues, fermentation residues.
  • the waste stream such as the waste water stream, may be of municipal or industrial origin.
  • a method or system according to the invention is in particular considered advantageous for the treatment of a waste stream, wherein the liquid effluent predominantly consists of water (more than 50 wt. %, in particular at least 80 wt. %, more in particular 90 wt. % or more).
  • the (solid) waste content may be 50 % or less, 20 % or less, 10 % or less or 2 % or less.
  • the high water content generally means that the amount of methane that leaves the reactor as dissolved methane in the liquid effluent is relatively high, and thus that the benefit of recovering dissolved methane is generally relatively high as well.
  • the anaerobic degradation process may be any anaerobic degradation process for degrading an organic substance in a waste stream.
  • the reactor system may be any reactor system for anaerobic degradation of organic substances
  • such process may be carried out in a reactor selected from the group of upflow anaerobic sludge blanket reactors (UASB) expanded granular sludge blanket reactors (EGSB), internal circulation reactor (IC), fluidized bed reactors, anaerobic membrane bio reactors (MBR), contact process, completely mixed digesters, anaerobic baffled reactors and anaerobic filters.
  • UASB reactor is a hydrolysis upflow sludge blanket (HUSB).
  • the reactor in a method or reaction system according to the invention may be an UASB reactor.
  • Such reactors, and suitable ways to operate such reactors are generally known in the art.
  • a UASB reactor or process may be used as described in WO 2005/095288 or WO 2007/078194.
  • AnMBR referenced is made to: The First Two Years of Full-Scale Anaerobic Membrane Bioreactor (AnMBR) Operation Treating High-Strength Industrial Wastewater, Scott Christian, Shannon Grant, Peter McCarthy, Dwain Wilson, and Dale Mills.
  • the anaerobic reactor (used) in accordance with the invention may be open (at the top) or be essentially closed (except for dedicated inlets and outlets, in particular for introducing waste stream, for removing gas, for removing liquid effluent).
  • a closed reactor has the advantage that contact with the atmosphere that would result in losses of methane to the environment is avoided or at least reduced.
  • the reactor may be a reactor tank.
  • the anaerobic reactor may be provided with an inlet for air for ventilating the headspace of the reactor. This may be ambient air.
  • the production of energy from methane usually comprises oxidation of methane.
  • the oxidation may be carried out in a conventional way by combustion or burning.
  • a flare may be used for flaring-off the methane, whereby the methane is burnt. Thereby (predominantly) carbon dioxide, water and heat are formed. The heat is then generally dissipated to the atmosphere.
  • the oxidation of methane is used, not only to convert the methane but also to recover produced energy, such that the energy may be used for a useful purpose.
  • the recovered energy may be in the form of electrical energy and/or in the form of heat, that can be used for heating an object or heat exchange medium.
  • the electrical energy may be produced using equipment known per se, such as a gas motor, a gas turbine or the like.
  • this equipment is provided with means to produce heat , for instance by converting a gas motor into a Combined Heat and Power (CHP) generation unit.
  • CHP Combined Heat and Power
  • Dedicated heat production may for instance be accomplished in a gas boiler.
  • a gas turbine may advantageously be provided, as in addition to providing means to oxidise the methane, it can provide (part of) the driving force to transport gas phases through conduits of the reaction system. Further, turbines can be highly robust, thereby allowing the combustion of relatively impure gas phase comprising methane.
  • impurities include water, carbon dioxide and/or sulphur compounds. This applies for both biogas and gas phase comprising methane obtained from the liquid effluent).
  • the transfer of dissolved methane to the gas phase will generally take place if the partial methane pressure (p CH4 ) in the gas phase is lower than the product of the dissolved methane concentration (c CH4 ) in the liquid effluent and the Henry coefficient for methane in the liquid effluent (kH CH4 ).
  • the value of the Henry coefficient that determines the solubility of the gas in water has been determined for various gases as a function of the temperature, for instance in Metcalf and Eddy, "Wastewater Engineering - Treatment and Reuse 2003, McCraw Hill publishing, pp 67, which also supplies a calculation method for the resulting equilibrium concentration on pp 65 - 69.
  • the methane concentration in the gas phase can be controlled at a concentration below the lower explosion limit, in particular if the gas phase is to be used as combustion air.
  • Figure 1 shows an exemplary embodiment of a system for such a method (Hereafter also referred to as CASE 1). This option has the advantage that the (covered) anaerobic reactor is simultaneously ventilated.
  • the methane concentration is above the lower explosion limit, and preferably at or above the upper explosion limit the gas phase comprising methane may be used as combustion fuel, for instance together with the biogas collected as a gas phase from the anaerobic reactor.
  • Figure 2 shows an exemplary embodiment of a system wherein part of the methane recovered from the liquid effluent can be combined with the biogas collected as a gas in the anaerobic reactor, such that it can be used as combustion fuel, whereas a second (diluted) methane stream is used as combustion air. (Hereafter also referred to as CASE 2).
  • FIG. 1 schematically shows a reactor system for a method wherein methane is transferred to a gas phase, which gas phase can subsequently be used as combustion air.
  • the reactor 1 shown in Figure 1 is an upflow reactor, for instance an UASB reactor. If desired, another type of reactor may be provided.
  • the internals of the reactor shown are only illustrative, collectors 2 are present for collecting liquid effluent (which may be submerged effluent pipes or collection channels, preferably with overflow weirs, as schematically shown in e.g. Figure 3. Preferred aspects of the collectors will be described below).
  • Collectors 2 are - at least during use - in fluid communication with a collection sump 3.
  • the collection sump 3 comprises an outlet 4 for gas phase (air + methane, suitable for use as combustion air) and an outlet 5 for liquid effluent.
  • Conduit 6 is provided to transport effluent from outlet 5 to one or more (optional) units for enhancing methane recovery from the liquid effluent.
  • the one or more units may be provided in series or parallel.
  • Figure 1 shows two units - 8 and 16 - for recovering methane. One of those may be omitted.
  • Unit 8 and/or 16 may in particular be stripping devices wherein liquid phase can intimately be contacted with gas phase, such as air, thereby enhancing transfer of dissolved methane to the gas phase.
  • Unit 8 may in particular be a stripper designed to overflow effluent on a grid or mesh, e.g. as schematically shown in Figure 4, with grid/mesh 14 and overflow 15 or a vacuum extraction device. If unit 8 is present, outlet 10 is provided for the gas phase comprising recovered methane (combustion air). Unit 8 is provided with outlet 9, which is - at least during use - in fluid communication with conduit 51 for directing liquid effluent to unit 16 (via inlet 11), if a further unit is used, or alternatively conduit 11 may be provided to lead the effluent to a (conventional) post- treatment process or elsewhere.
  • outlet 10 is provided for the gas phase comprising recovered methane (combustion air).
  • Unit 8 is provided with outlet 9, which is - at least during use - in fluid communication with conduit 51 for directing liquid effluent to unit 16 (via inlet 11), if a further unit is used, or alternatively conduit 11 may be provided to lead the effluent to a (conventional
  • unit 16 is depicted as an aerated device. This device is shown in Figure 1 as a preferred example, only. Such device is in particular preferred because it is not only particularly effective for recovering methane, but also the aeration device may serve to oxidise unde sired sulphur compounds, which may be present in the liquid effluent.
  • Unit 16 is provided with aeration equipment 64 and an outlet for liquid effluent (typically to be lead to a (conventional) post-treatment process or elsewhere). Further, unit 16 comprises an outlet 19 for gas phase (air) comprising recovered methane (combustion air).
  • Flare 22 and/or unit 23 for recovering energy comprise an inlet 38 for biogas collected from the anaerobic reactor 1.
  • the collection system for the biogas can be a system known per se.
  • the reactor system may be provided with a gas holder 43 for storing biogas which is connected to the biogas collectors 50 in the reactor 1 via outlets 40 for the biogas, conduit 41 and inlet 42.
  • the gas holder is preferably present because variations of the methane (biogas) production due to peak loadings of the anaerobic reactors are avoided.
  • the gas holder 43 is provided with an outlet 44 through which the biogas can be transported to the flare 22 or the unit for recovering energy 23.
  • the biogas from the gas holder 43 (or from the reactor is such holder is absent) is subjected to a gas treatment (to remove undesired components such as hydrogen sulphide and water.
  • a conduit 45 is usually provided between outlet 44 and an inlet 46 of a biogas treatment facility 47.
  • Biogas treatment facility 47 is provided with outlet 48, connected to a conduit 49, via which the (conditioned) biogas can be transported to the flare 22 (in Figure 1, via conduit 37, a valve and inlet 38) or the unit 23 for recovering reaction energy (in Figure 1, via conduit 36 and inlet 35).
  • the outlet(s) for gas phase (4, 8, 19) from the unit(s) for transferring dissolved methane (combustion air) to the gas phase are connected to conduit(s) (17, 20, 21) via which gas phase can be transported to the unit(s) for oxidising methane.
  • the way in which the connections between conduits are shown in Figure 1 is exemplary.
  • the conduit(s) may be provided with valves, as desired, in order to regulate the flow (preferred examples are shown in Figure 1 and are marked as NNF).
  • Figure 1 shows an embodiment, wherein both a flare 22 and a unit 23 for recovering reaction energy (formed by the oxidation of methane) are present.
  • reaction energy formed by the oxidation of methane
  • a flare 22 is preferably present as a back-up, for converting methane at any period wherein the capacity of unit 23 would be insufficient to convert all the combustion fuel.
  • the conduit(s) (17, 20, 21) comprising recovered methane (and typically air) may directly lead to inlet 39 for the flare 22 (In Figure 1 via conduits 24 and 39) .
  • a backpressure valve is present in order to regulate the flow to the flare 23. usually, this valve is closed during normal operation.
  • the flare may advantageously be equipped with a device, to serve as an inlet for leading additional air (make-up air) into the flare, for instance a slitted skirt around the flare.
  • a slitted skirt provides vertical elongate openings in a lower part of the flare, via which ambient air can flow into the flare.
  • the system may be provided with a vent or combustion gas treatment unit 26, wherein one or more undesired components (e.g. water, hydrogen sulphide) can be removed from the gas phase comprising methane (combustion air).
  • a vent or combustion gas treatment unit 26 wherein one or more undesired components (e.g. water, hydrogen sulphide) can be removed from the gas phase comprising methane (combustion air).
  • This unit is shown in Figure 1.
  • An inlet 25 and an outlet 26 are provided. Outlet 26 is connected to a conduit 28 for the treated gas phase comprising recovered methane.
  • a mixing chamber 30 may be present, wherein the gas phase comprising recovered methane (combustion air) can be mixed with make-up air to provide a sufficient quantity of oxygen for combustion of the biogas stream obtained as a gas phase from the reactor 1 (biogas that has been collected via collectors 40).
  • the outlet 32 is connected with a conduit 33 for transporting the combustion air mixture into the unit 23 via inlet 34.
  • FIG. 2 schematically shows an embodiment wherein part of the recovered methane that is recovered in the effluent collection system up and until unit 8 (high methane content) is combined with the biogas collected as a gas in the reactor 1.
  • at least one of the outlets for gas phase from collection sump 3 (outlet 53) and the optionally present unit 10 (outlet 4), which in this embodiment preferably is a vacuum extraction device, is connected to a conduit system adapted to ultimately transport the gas phase comprising recovered methane to flare 22 or unit 23 for recovering reaction energy, in which flare 22 or unit 23 the gas phase can be used as combustion fuel.
  • Figure 2 shows an advantageous design wherein conduits 52 and 53 for the gas phase are provided, which conduits lead to a compressor 54 from which compressor a conduit 55 extends via which the gas can be introduced in conduit 41.
  • the remainder of the set-up in Figure 2 essentially corresponds to the set-up in Figure 1.
  • a system for ventilation gas treatment is provided , in particular if the recovered gas phase comprising methane is to be used as part of the combustion fuel.
  • the unit 16 may be omitted, namely in those embodiments where sufficient dissolved methane is recovered from the liquid effluent.
  • an aeration device is usually present and the off-gas from the aeration device may be provided with a system to introduce the off-gas into the flare or unit 23, where it can be used as combustion air.
  • the recovery of methane is improved, as aeration is considered a highly effective technique to remove methane from the liquid effluent.
  • the gas phase containing methane taken from the aeration device may be treated further, in particular be dried and/or subjected to a H2S removal step (if a substantial amount of H2S is present), before further use before being discarded. It may in particular be used as combustion air, as discussed in Figure 1.
  • Suitable collection channels include pipes and covered gutters.
  • the collection channels 2 are usually enclosed structures. By having enclosed collection channels the risk of a substantial loss of the methane into the atmosphere is reduced., Thus, the contents of the channels are essentially surrounded by sides(s) a, e.g. as shown in both cylindrical channels depicted in Figure 3, with the proviso that openings e, f for introducing fluid (liquid effluent and/or gas phase) into the channels may be provided in (one or more of) the side(s).
  • the openings e, / are present in addition to an outlet for liquid effluent (and gas phase if present in the channels) d, generally present at an extremity of the channel.
  • openings typically overflow into a common effluent header (enclosed channel or pipe, not shown in Figures 1, 2 and 3), which in turn overflows into the collection sump 3.
  • the openings may be perforations or notches ⁇ e.g. triangular notches).
  • the openings e, f are generally provided along at least part of a wall a of the channel (in particular along at least part of the wall defined by the surface along the generating line b of the channel). End c of the channel may be closed or provide an inlet for gas phase, which is optionally present. Such dedicated inlet (not shown in Figure 3) may in particular be provided with a valve so that gas flow through the channel can be regulated.
  • the gas phase introduced into the collection channel may be taken from the headspace of the anaerobic reactor (the space above the liquid level in the reactor).
  • the gas phase in the headspace may have a relatively low methane content, and thus transfer of methane from the liquid effluent to the gas phase tends to take place.
  • the thus obtained gas phase (comprising air and methane) may in particular be used as combustion air.
  • the collection channels may in principle be fully filled with liquid effluent.
  • the collection channels are (on average) only partially filled with effluent, in particular for up to 75 %, e.g. for 5-50 %. This allows for a balanced effluent withdrawal over the reactor for an advantageous treatment efficiency.
  • the effluent may be withdrawn continuously or intermittently. Accordingly, the flow through the collection channels may from time to time be zero, and thus the collection channels may be empty from time to time.
  • the collection channels are usually positioned such that the openings for the liquid effluent are below the liquid level in the reactor, at least for part of the duration of operating the anaerobic reactor.
  • the collection channels are advantageously positioned close to the surface of the liquid phase in the reactor, in particular 0- 100 mm, more in particular 0-80 mm below said surface.
  • the liquid level typically varies between 0 - 50 mm above the base of the overflow weir.
  • the diameter of the collection channels, in particular of effluent collection pipes can be chosen within wide ranges, e.g. in the range of 150 to 300 mm.
  • the openings have dimensions suitable to introduce liquid into the channels.
  • these openings may have a diameter in the range of 15 to 40 mm.
  • the liquid flow rate through the openings in the collection channels may suitably vary in a wide range.
  • the velocity varies between 0 and 1.5 m/s.
  • the average velocity during use is between 0.2 and 1.25 m/s, in particular between 0.4 and 1.0 m/s, more in particular between 0.5 and 0.7 m/s.
  • the collector may advantageously be adapted with means to prevent or at least reduce introduction of gas into the channels.
  • the collector may be provided with a water lock e.g. as schematically shown in Figure 5.
  • the water lock may be a cover 59 over the collection channel 2, with sides extending below the minimum liquid level during use of the reactor 1 and below the opening(s) e, f in the collection channels 2.
  • the left- hand figure shows a situation wherein no effluent is withdrawn. In the absence of cover 59 gas would flow into the channel 2, however the presence of the cover prevents a substantial gas flow into the channel 2.
  • the right-hand figure shows the situation during normal operation wherein liquid flows into the channel 2.
  • FIG. 6 Another way to avoid undesired introduction of gas is shown in Figure 6 is to provide the collector 2 with means to adapt the level of the openings in the collectors with alteration in the liquid level in the anaerobic reactor 1, e.g. with floater 60.
  • the outlet for liquid from collector 2 is a flexible channel 61 via which the effluent flows into effluent channel 62. From there, it usually flows to the collection sump.
  • the liquid level in the collector 2 is above the overflow liquid level 63 of effluent channel 62, whereby effluent will be withdrawn from the reactor 1.
  • the liquid level in the reactor 1 is lowered so far that the liquid level in the collector 2 is at the same height as the overflow level 63 in effluent channel 62, whereby no effluent is withdrawn from reactor 1.
  • the system of the invention may be provided with a collection sump 3.
  • a collection sump is advantageously provided with an outlet 4 for gas phase (which gas phase may be referred to as anaerobic reactor vent gas), in addition to an outlet 5 for liquid effluent.
  • gas phase which gas phase may be referred to as anaerobic reactor vent gas
  • the gas phase can be separated from the effluent, if in a method of the invention liquid effluent is collected from the anaerobic reactor 1 together with a gas phase.
  • the liquid effluent is introduced into the collection sump 3 from collector(s) 2, via inlet 57 (see e.g. Figure 1).
  • An intermediate conduit (such as effluent channel 62 as shown in Figure 6) may be present between collector(s) and inlet 57.
  • the liquid effluent is introduced into the sump 3 above the liquid level, allowing a free fall of the introduced liquid. This increases contact with the gas phase and thus transfer of methane.
  • the collection sump 3 is optionally provided with a device for enhancing the release of dissolved methane into the gas phase.
  • a device for enhancing the release of dissolved methane into the gas phase include in particular devices for causing turbulences in the liquid phase in the collection sump, e.g. a series of cascades, or several weir meshes.
  • the gas phase can be drawn from the collection sump with a gas ventilator or compressor or the like (in particular in the above described case 1, shown as item 56 in Figure 1).
  • the collection sump is provided with a ventilating system for introducing air into the collection system. Thereby transfer of methane from the liquid effluent to the gas phase is generally improved.
  • gas may be taken from the headspace to be contacted with the liquid effluent.
  • transfer of methane from the liquid effluent to the gas phase may be improved by operating the collection sump under sub-atmospheric pressure conditions (employing vacuum extraction).
  • the obtained gas phase may in particular be suitable as combustion fuel.
  • the gas phase may be used as combustion air, or as combustion fuel (with the biogas collected as a gas phase in reactor 1).
  • the system may be provided with a sensor for monitoring methane, and if desired oxygen, and a valve that allows switching of the gas flow between the stream to be used for combustion fuel (e.g. via conduits 53, 55, 41 etc. as shown in Figure 2) and the stream to be used for combustion air (e.g. via conduits 6, 20, etc as shown in Figure 1).
  • one or more methane gas-recovery devices may be provided (in the conduit between 1 and optionally 16), such as a methane stripping device.
  • a methane stripping device is schematically shown in Figure 4.
  • Such device is known as a vacuum degasser.
  • Suitable ways to operate such a device may for instance be based on Handleiding voor het gebruik van water in de Industrie, 1971, Vereniging
  • venturi strippers e.g as described in GB 2381 761 A
  • degassing membranes are commercially available, e.g. from Liqui-Cell:
  • Liquid effluent leaving the final methane gas recovery unit may be subjected to a post-treatment step or lead to the final disposal.
  • a method according to the invention is generally carried out without any substantial recycling of the degassed liquid effluent into the reactor wherein anaerobic degradation is carried out, although in principle it is possible to recycle a part of the degassed effluent, e.g. 50 % or less the volume or less, in particular less 10 % of the volume or less.
  • Carrying out a method according to the invention without recycling or only recycling a minor part of the volume of degassed effluent is advantageous since the flow subjected to methane removal is increased with increasing recycle. Increased flow means generally that more equipment or larger equipment is needed. Also, it adds complexity to the process.
  • the system of the invention is provided with an reactor for post- treatment of the anaerobic effluent fitted with an aeration device.
  • the aeration device is advantageously used, not only to recover dissolved methane, but also to oxidise one or more sulphur compounds (organic sulphur compounds, H2S).
  • the aeration device and operating conditions can be chosen based on technology known per se, e.g. as described in Metcalf and Eddy, "Wastewater Engineering - Treatment and Reuse" 2003, McCraw Hill publishing , section 5- 12 Aeration systems pp 430 - 456.
  • the gas phase obtained by subjecting the liquid effluent to aeration may in particular be used as combustion air for combusting biogas collected (as a gas phase) from the anaerobic degradation process.
  • the reaction system of the invention is designed to have a gas phase comprising air and methane to be used as combustion air for a unit for combusting biogas, in particular a unit wherein the reaction heat released by the combustion is utilised for energy or heat generation
  • the system is preferably provided with a combustion air inlet tank, said tank further comprising an inlet for (ambient) air, via which inlet (ambient) air can be introduced in the combustion air inlet tank at times when there is insufficient combustion air provided by the gas phase comprising air and methane for combusting all the biogas that is to be used for energy production. Air introduced via this inlet may also be referred to as make-up air.
  • the tank further comprises an outlet for combustion air via which outlet the combustion air can be directed to a combustion unit wherein the biogas is to be combusted, thereby producing energy.
  • the flare is preferably provided with an inlet for additional air (make-up air, item 58 in Figure 1 and in Figure 2), to be introduced into the flare at times when insufficient air is provided via the gas phase comprising air and methane in order to ensure full combustion of the biogas.
  • additional air make-up air, item 58 in Figure 1 and in Figure 2
  • Such flare comprises a burner placed inside an encasing (closed flare), which encasing may basically be a pipe. The air is allowed to freely enter from slotted openings in a lower end of the encasing, sufficient to let in the required quantity of air if there is no or insufficient supply of combustion air.
  • a vacuum extraction device for methane recovery.
  • the effluent can be subjected to vacuum extraction, whereby methane is transferred from the effluent to the gas phase.
  • Vacuum extraction is particularly suitable to obtain a gas phase with a high methane content, usually above the lower explosion limit, in particular above the higher explosion limit, more in particular a methane content in the range of 15 to 80 vol %.
  • a technique is in particular suitable to provide a gas phase that can be used as combustion fuel.
  • Vacuum extraction comprises subjecting the liquid effluent to a sub-atmospheric pressure, usually a pressure of 0.8 bara or less, in particular a pressure of 0.5 bara or less.
  • the sub- atmospheric pressure may in particular be 0.1 bara or more, or 0.25 bara or more, especially in an embodiment comprising (the use of) a UASB reactor.
  • liquid effluent from the vacuum extraction step is subjected to aeration, for further recovery of dissolved methane in the liquid effluent from the vacuum extraction step.
  • the reactor system (used) according to the invention has a conduit between the outlet for biogas produced in the anaerobic reactor and the unit for producing energy from methane, which conduit comprises a gas flow meter and optionally a methane sensor.
  • a gas flow meter may for instance be provided in any of conduits 41, 45 and 49 as shown in Figure 1 and 2) for transporting biogas from the anaerobic reactor (1) to a flare (22) or unit for recovering energy (23).
  • an estimated oxygen (air) requirement for combustion of the biogas can be determined, and the flow rate of combustion air can be regulated accordingly.
  • the presence of a flow rate meter in the conduit for transporting biogas leading from the anaerobic reactor (41) is advantageous since it allows direct feedback to the production rate of methane in the anaerobic reactor.
  • a flow meter in a conduit for transporting biogas more downstream thereof is advantageous since it measures the actual flow rate towards the flare 22 and/or energy recovery unit 23, thereby providing more instant data to regulate the combustion air flow rate.
  • the composition of the biogas is relatively stable.
  • one or more of the conduits comprise a methane sensor, which allows for an increased accuracy in the determination of the required combustion air flow rate, as in such embodiment fluctuations in the methane concentration can be taken into account.
  • the reactor system (used) according to the invention may comprise a conduit for transporting gas phase from the methane gas-recovery unit to the unit for producing energy from methane which conduit comprises a gas flow meter and optionally a methane sensor.
  • the concentration of methane in the combustion air can be taken into account as well, when determining the required combustion air flow rate.
  • a flow rate meter can therefore be provided in a conduit for transporting gas phase comprising recovered methane from any methane recovery unit.
  • the methane concentration is relatively stable, but - if desired - a methane sensor may be provided as well, whereby fluctuations in the methane concentration can be taken into account.
  • a further advantage of a methane sensor in a conduit for transporting gas phase comprising recovered methane from any methane recovery unit is related to safety.
  • Such sensor can be used to monitor whether the methane concentration at any point in time reach a value between the lower and upper explosion limit, and thus measures can be taken to bring the methane concentration outside this range, thereby avoiding a potential explosion hazard. It is also possible to provide an oxygen sensor for this purpose.
  • a flow meter may be provided in at least one of the conduits 41, 45 and 49. Based on the biogas flow rate to the device for producing energy (a combustion device like a flare, gas motor etc), an estimated oxygen (and air) requirement for combustion is calculated.
  • a combustion device like a flare, gas motor etc
  • a certain multiplier value (> 1.0) (adjustable by operations supervisor) can be added to compensate for the additional oxygen demand resulting from the presence of methane in the combustion air and for the reduced oxygen content (compared to air). This relates to both the combustion air from the effluent collection system 3 and the off gas from the pre-aeration unit (16).
  • the air flow rate to the pre-aeration unit is measured as well (in conduit from 64 to 16). Based on the calculated oxygen (air) demand and the supply to unit 16, the difference serves as a set-point for the vent gas extraction flow (21 + 17).
  • vent gas treatment unit After treatment in a vent gas treatment unit, the treated vent gas is then usually discharged to the atmosphere.
  • the quantity of gas phase obtained in a methane recovery unit that is to be used as combustion air is generally much smaller. If a setup as shown in Figure 2 is used, then ideally only the off-gas from unit 16 is used as combustion air. Operation of this unit is usually not depending on the actual methane combustion rate, as this unit is usually also used for sulphide oxidation, which normally proceeds throughout the use of the method. At moments where there is no methane combustion, the off-gas may be treated in a vent gas unit only and discharged to the atmosphere.
  • Such provision can be taken at a central level (i.e. below a certain flow rate setpoint) or at a reactor level (e.g. using a simple level switch (like the float valve or ball cock used in toilet flush reservoirs) that stops vent gas extraction at a certain minimum level.
  • a reactor level e.g. using a simple level switch (like the float valve or ball cock used in toilet flush reservoirs) that stops vent gas extraction at a certain minimum level.
  • methane sensors or oxygen sensors can be installed in conduit 53, 55 or 41 that will be triggered at a certain setpoint and stop the injection of the vent gas into the biogas conduit 41.
  • Methane recovery from unit 8 can continue also when the waste stream flow into the reactor is stopped or becomes too low, as water locks are usually provided that prevent entrance of air into this unit.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • General Engineering & Computer Science (AREA)
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  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Physical Water Treatments (AREA)
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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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Abstract

L'invention concerne un procédé permettant de récupérer du méthane à partir d'un effluent liquide d'un réacteur dans lequel un flux de déchets comprenant une ou plusieurs substances organiques a été soumis à un processus de fermentation anaérobie dans lequel le biogaz de réacteur, comprenant du méthane, a été produit à partir desdites substances organiques, l'effluent liquide comprenant du méthane dissous, le procédé consistant à transférer le méthane dissous de l'effluent à une phase gazeuse et à l'utiliser pour produire de l'énergie.
EP11805247.1A 2010-12-07 2011-12-07 Procédé et installation de récupération et d'utilisation du méthane à partir d'un effluent liquide anaérobie Withdrawn EP2649011A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11805247.1A EP2649011A1 (fr) 2010-12-07 2011-12-07 Procédé et installation de récupération et d'utilisation du méthane à partir d'un effluent liquide anaérobie

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10193889.2A EP2463240B1 (fr) 2010-12-07 2010-12-07 Installation et procédé de récupération de méthane d'un effluent liquide
EP11805247.1A EP2649011A1 (fr) 2010-12-07 2011-12-07 Procédé et installation de récupération et d'utilisation du méthane à partir d'un effluent liquide anaérobie
PCT/NL2011/050840 WO2012078044A1 (fr) 2010-12-07 2011-12-07 Procédé et installation de récupération et d'utilisation du méthane à partir d'un effluent liquide anaérobie

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EP11805247.1A Withdrawn EP2649011A1 (fr) 2010-12-07 2011-12-07 Procédé et installation de récupération et d'utilisation du méthane à partir d'un effluent liquide anaérobie

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AR (1) AR084159A1 (fr)
BR (1) BR112013014107B1 (fr)
ES (1) ES2548249T3 (fr)
HR (1) HRP20150984T1 (fr)
MA (1) MA34879B1 (fr)
MX (1) MX349909B (fr)
PT (1) PT2463240E (fr)
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FR2994249B1 (fr) * 2012-08-06 2018-09-07 Degremont Procede et installation de production d'electricite a partir de dechets fermentescibles, en particuler de boues de station d'epuration
ES2542257B1 (es) 2014-02-03 2016-06-29 Universitat De València Procedimiento para la depuración de gases que contienen compuestos orgánicos volátiles
DE102015109822A1 (de) 2015-06-19 2016-12-22 Gottfried Wilhelm Leibniz Universität Hannover Verfahren und Vorrichtung zur Gewinnung von Methan aus anaeroben Abwässern
US10989215B2 (en) 2017-09-05 2021-04-27 Solar Turbines Incorporated Compressor system equipped for fugitive gas handling and fugitive gas system operating method
WO2020263356A1 (fr) * 2019-06-28 2020-12-30 Brown And Caldwell Appareils et procédés associés pour la capture de biogaz à partir d'eaux usées
GB2599126A (en) * 2020-09-24 2022-03-30 Connected Energy Tech Limited A gas meter for a biogas digester
CN113526792B (zh) * 2021-07-26 2023-04-07 江苏中车华腾环保科技有限公司 一种厨余废水资源化处理的方法及系统
WO2023073377A1 (fr) * 2021-10-27 2023-05-04 Bluemethane Limited Procédé et appareil de récupération de méthane à partir d'un écoulement d'eau

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EP1806324A1 (fr) 2006-01-05 2007-07-11 Biothane Systems International B.V. Procédé et Installation pour la purification anaérobie des eaux usées

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MATSUURA N ET AL: "Closed DHS system to prevent dissolved methane emissions as greenhouse gas in anaerobic wastewater treatment by its recovery and biological oxidation", WATER SCIENCE & TECHNOLOGY, I W A PUBLISHING, GB, vol. 61, no. 9, 1 January 2010 (2010-01-01), pages 2407 - 2415, XP009166361, ISSN: 0273-1223 *
See also references of WO2012078044A1 *

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MA34879B1 (fr) 2014-02-01
EP2463240B1 (fr) 2015-08-19
HRP20150984T1 (hr) 2015-11-20
EP2463240A1 (fr) 2012-06-13
MX349909B (es) 2017-08-18
WO2012078044A1 (fr) 2012-06-14
PT2463240E (pt) 2015-10-21
BR112013014107A2 (pt) 2016-09-20
BR112013014107B1 (pt) 2020-02-11
ES2548249T3 (es) 2015-10-15
AR084159A1 (es) 2013-04-24

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