NL2021917B1 - Method for recovering nitrogen from a waste stream - Google Patents

Method for recovering nitrogen from a waste stream Download PDF

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Publication number
NL2021917B1
NL2021917B1 NL2021917A NL2021917A NL2021917B1 NL 2021917 B1 NL2021917 B1 NL 2021917B1 NL 2021917 A NL2021917 A NL 2021917A NL 2021917 A NL2021917 A NL 2021917A NL 2021917 B1 NL2021917 B1 NL 2021917B1
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Netherlands
Prior art keywords
ammonia
waste stream
carbon dioxide
carrier gas
water
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NL2021917A
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Dutch (nl)
Inventor
Klein Teeselink Hermanus
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Host Holding B V
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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
    • 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F2001/5218—Crystallization
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/02—Temperature

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention relates to a system and a method for recovering nitrogen from a waste stream, in particular a biomass waste stream, wherein ammonia is recovered 5 from the waste stream and used in order to form for example a valuable fertilizer.

Description

Method for recovering nitrogen from a waste stream
The invention relates to a method for recovering nitrogen from a waste stream, in particular a biomass waste stream. The invention also relates to a system for recovering nitrogen from a waste stream, in particular a biomass waste stream. The invention furthermore relates to the use of carbon dioxide obtained from a biomass conversion to recover nitrogen from a waste stream, in particular a biomass waste stream.
The use of biomass fermentation plants is popular for the conversion of biomass into biogas. Biogas is a valuable product as it consists mainly of methane (CH4) and carbon dioxide (CO2). Biomethane or green gas is an efficient energy carrier which can be used as a substitute for natural gas. The amount of carbon dioxide that is produced corresponds to the amount of carbon dioxide captured when the biomass was created, resulting in that biogas is a CO2- neutral and renewable source of energy. A further product obtained during the conversion of biomass into biogas is digestate, in particular a digestate waste stream. Such digestate waste stream generally contains a relatively large amount of nitrogen (N), which can for example be present in the form of ammonia (NH3) and/or ammonium (NHU). Nitrogen is generally removed from the waste stream in the form of nitrogen gas (N2) in order to be able to discharge the effluent of the waste stream to for example the sewer or the surface water. This residual nitrogen gas is however relatively invaluable. It would be beneficial if the nitrogen can be recovered and subsequently reused in a valuable product.
It is therefore a goal of the invention to find a solution wherein nitrogen can recovered from a waste stream preferably resulting in a valuable product.
The invention thereto provides a method for recovering nitrogen from a waste stream, in particular a biomass waste stream, comprising the steps of:
A) providing a waste stream comprising ammonia and/or ammonium,
B) recovering the ammonia and/or ammonium from the waste stream by bringing the waste stream in contact with a carrier gas which is configured to capture ammonia and preferably transferring the ammonia from the waste stream to the carrier gas,
C) bringing the ammonia recovered by the carrier gas, direct or indirect, in contact with water and carbon dioxide such that at least a fraction of the ammonia reacts to form an ammonium bicarbonate solution, and
D) discharging the ammonium bicarbonate solution.
The nitrogen is recovered in the form of ammonia from the waste stream by bringing the waste stream into contact with a carrier gas which is configured to capture ammonia. With the term recovering also the term removing is meant. The nitrogen, and in particular the ammonia, is stripped from the (liquid) waste stream by the carrier gas. The ammonia is preferably transferred to the carrier gas. The carrier gas and the ammonia recovered by the carrier gas therefore form a carrier gas which is enriched with ammonia. The ammonia recovered by the carrier gas can be brought into contact with water and carbon dioxide either directly or indirectly such that at least a fraction of the ammonia reacts to form an ammonium bicarbonate solution. Hence, with the method according the invention it is possible to recover nitrogen from a waste stream thereby obtaining a valuable product, in particular ammonium bicarbonate (NH4HCO3). Ammonium bicarbonate is a valuable fertilizer which can be used for agricultural purposes. An advantage of ammonium bicarbonate over other fertilizers as for example ammonium sulphate, is that is does not lead to acidification of the soil. The ammonium bicarbonate obtained during application of the method according to the invention is substantially present in an aqueous solution. This aqueous solution is relatively easy storable and preservable. It is, besides the use as fertilizer, also possible that the ammonium bicarbonate solution is subjected to further processing. The concentration of the obtained ammonium bicarbonate solution obtained in the method according to the invention is at least partially dependent on the process conditions applied. A further benefit of the method according to the invention is that a possible gaseous rest product comprises clean off gas which can be directly discharged for example to the atmosphere. The gaseous rest product is substantially formed by the carrier gas of which ammonia is removed during step
C). It is also possible that the gaseous rest product is recycled and for example reused as carrier gas during step B). The gaseous rest product is at least low in nitrogen or can even be substantially free of nitrogen. Hence, the method according to the invention is relatively environmentally friendly, in particular when compared to the known methods for the removal of nitrogen from a (biomass) waste stream.
The waste stream is in particular a biomass waste stream. Non-limiting examples whereof the waste stream can originate are: agricultural residues, organic and/or inorganic waste, industrial waste, slaughter waste and municipal waste. The waste stream is generally a liquid or an aqueous waste stream and may also comprise ammonium. The ammonium present in the waste stream is generally in equilibrium with the ammonia. It is beneficial if the equilibrium is shifted towards ammonia prior to the step wherein the waste stream is brought into contact with the carrier gas as this may contribute to obtain a high yield of the desired ammonium bicarbonate solution. The shifting of the equilibrium in the waste stream towards ammonia can for example be done by raising the temperature and/or increasing the pH of the waste stream.
It is conceivable that at least a fraction of the ammonia recovered by carrier gas is dissolved in water before and/or during step C). Hence, it is possible that ammonia both in gaseous form and in an aqueous form are brought into contact with carbon dioxide. This may increase the yield of ammonium bicarbonate formed during application of the method according to the invention.
It is possible that at least a fraction of carbon dioxide is dissolved in water before the carbon dioxide is brought into contact with the ammonia recovered by the carrier gas. An advantage of using carbon dioxide which is dissolved in water is that a relatively large contact area between ammonia, which can be gaseous and/or aqueous ammonia, and carbon dioxide and possibly water can be obtained. It is for example possible that carbon dioxide is dissolved into water up to saturation of the water. The temperature of the water should be chosen such that dissolving of carbon dioxide in water is enabled. In a possible embodiment is the temperature of the water containing at least a fraction of carbon dioxide which is brought into contact with the ammonia recovered by the carrier gas, between 0 and 50 degrees Celsius, and preferably between 20 and 40 degrees Celsius. This temperature ranges will enable both that carbon dioxide and ammonia can dissolve in water as well that the (aqueous) carbon dioxide and (aqueous) ammonia can react to form the ammonium bicarbonate solution.
The waste stream, and in particular the biomass waste stream, is generally a substantially liquid waste stream. It is possible that the waste stream, in particular the biomass waste steam, originates from digestate, in particular digestate obtained during conversion of biomass into biogas and digestate. Digestate, in particular digestate obtained during conversion of biomass into biogas, has a relatively high nitrogen fraction, and in particular a high ammonium and/or ammonia fraction, making the digestate suitable for use in the method according to the invention. At least part of the waste stream can be formed by the thin fraction of digestate. The digestate obtained during the conversion of biomass into biogas contains a thick fraction and a thin fraction. These fraction can be separated using commonly known separating techniques. Non-limiting examples of these separation techniques are screw-press separation, decanting, centrifugation, belt press separation and/or combination thereof. The thin fraction is a substantially liquid fraction generally containing a relatively high fraction of nitrogen. Therefore the thin fraction is in particular of interest for use in the method according to the invention. It is possible that the waste stream is filtered before said waste stream is brought into contact with the carrier gas which is configured to capture ammonia. This may further enhance the process efficiency of the recovery of nitrogen, an in particular ammonia, from the waste stream when the process is not affected by for example solid particles.
In a further embodiment is it possible that at least part, and preferably substantially all, of the carbon dioxide supplied at step C) is recovered from biogas obtained during conversion of biomass into biogas and digestate and/or during upgrading of the biogas. Carbon dioxide is in particular obtained during upgrading of the biogas into biomethane. Upgrading of biogas into biomethane is primarily based on carbon dioxide removal. The amount of carbon dioxide needed for the conversion of biomass substantially equals the amount of carbon dioxide which is produced during this process. The production process of biogas is therefore already CO2 neutral. The obtained carbon dioxide is basically a by-product or residual product of the biomass conversion. At least part, and preferably substantially all, of the carbon dioxide supplied at step C) may thus be formed as a by-product or residual product of the biomass conversion. Use of this residual carbon dioxide would make the process even more environmentally friendly. It would in particular be beneficial if the method according to the invention could be carried out on-site or at least near the biomass conversion plant. It is for example possible that facilities for liquefaction of carbon dioxide are present. It is also possible that residual heat which is produced during the biogas upgrading is used during any of the process steps related to the stripping of ammonia from the waste stream and/or the formation of ammonium bicarbonate solution.
It is furthermore possible that at least a fraction of carbon dioxide is added to the ammonia and carrier gas obtained at step B) before this (gaseous) ammonia, carrier gas and carbon dioxide are brought into contact with (liquid) water. In this way at least part of the carbon dioxide can react with the ammonia and water vapour present in the carrier gas to ammonium bicarbonate. This may further increase the yield of ammonium bicarbonate. Additionally, the carbon dioxide may be used to force the carrier gas through a treatment system.
The method according to the invention may further comprise the step of cooling, and in particular crystallizing, the ammonium bicarbonate solution. In this manner it is possible to obtain a solid product of ammonium bicarbonate. This can for example be beneficial in order to reduce transport costs of the ammonium bicarbonate. The residual water obtained during the cooling and/or crystallization can be reused in the method. The residual water may for example be provided at step C). It is thereby possible that at least a fraction of carbon dioxide is dissolved in the residual water.
The carrier gas used in the method according to the invention generally comprises air, nitrogen gas and/or carbon dioxide. Combinations thereof are also possible. A benefit of using air would be that is abundantly available and cheap. A benefit of using carbon dioxide would be that it is possible to use carbon dioxide which originates from elsewhere in the process. At least part of the carbon dioxide present in the carrier gas can for example be residual carbon dioxide from the production of ammonium bicarbonate. It is also possible that at least part of the carbon dioxide used is residual carbon dioxide obtained during upgrading of biogas.
In an possible embodiment, step B) is performed by making use of at least one stripper column. Non-limiting examples of a possible stripper column are a packed column, a disc column, a bubble column or a spray column. A benefit of using a stripper column is that such stripper column facilitates the ammonia to be recovered relatively easy from the waste stream by providing a relatively large contact area and/or a relatively long contact time between the carrier gas and the (liquid) waste stream, and therefore the ammonia. The carrier gas is for example provided at a bottom region of the stripper column and the waste stream is provided at a top region of the stripper column, to allow a counter flow configuration. The stripper column generally comprises a liquid outlet and a gas outlet. The carrier gas enriched with ammonia will exit the stripper column via the gas outlet, where the liquid stripped effluent will exit the stripper column via de liquid outlet.
It is also conceivable that step C) is performed by making use of an absorber column. Non-limiting examples of a possible absorber column are for example a packed column, a disc column, a bubble column, a spray column or the like. An absorber column enables relatively good mass transport, which is beneficial for the production of ammonium bicarbonate. It is for example possible that ammonia is provided at a bottom region of the absorber column. In particular is carrier gas enriched with ammonia obtained at step B), in particular step B) performed in at least one stripper column, provided at a bottom region of the absorber column. At least a fraction of the carbon dioxide and at least a fraction of the water are preferably provided at a top region of the absorber column.
It is furthermore possible that the pH of the (liquid) waste stream is adjusted before step A). This may be beneficial for the yield of ammonium bicarbonate to be formed since by adjusting the pH of the waste stream the equilibrium of ammonium and ammonia in the waste stream can be shifted towards ammonia. Subsequently is a relatively high amount of ammonia present in the waste stream which can be captured by the carrier gas. A higher amount of ammonia present in the carrier gas can consequently lead to increased production of ammonium bicarbonate. Adjusting of the pH of the waste stream can for example be done via adding sodium hydroxide (NaOH), calcium oxide (CaO) and/or calcium hydroxide (CaOH). The pH of the waste stream is preferably adjusted such that the pH of the waste stream is between 7 and 11, preferably between 8 and 10, more preferably between 9 and 10.
It is also conceivable that the temperature of the (liquid) waste stream is increased before step A). This may positively contribute to the amount of ammonia which can be captured by the carrier gas, which may also lead to increased production of ammonium bicarbonate. The temperature can for example be increased by heating of the (liquid) waste stream to a temperature between 30 and 80 degrees Celsius, preferably between 40 and 70 degrees Celsius and more preferably between 50 and 60 degrees Celsius.
The invention furthermore relates to a system for recovering nitrogen from a waste stream, in particular a biomass waste stream, comprising:
- a stripper column, comprising:
o at least one ammonia inlet for providing a waste stream comprising ammonia into said stripper column, o at least one carrier gas inlet for providing a carrier gas which is configured to capture ammonia into said stripper column, and o at least one gas outlet for discharging carrier gas which is enriched with ammonia, and
- an absorber column, comprising:
o at least one ammonia inlet for providing ammonia into said absorber column, o at least one water and carbon dioxide inlet for providing water and carbon dioxide into said absorber column, and o at least one liquid outlet for discharging ammonium bicarbonate solution which is formed when the ammonia recovered by the carrier gas is brought into contact with water and carbon dioxide, wherein the system is configured such that at least part, and preferably all, of the ammonia recovered by the carrier gas in the stripper column is supplied to the ammonia inlet of the absorber column.
The benefits as described above for the method according to the invention also apply to the system according to the invention. The system according to invention is in particular configured for recovering nitrogen from a waste stream, in particular a biomass waste stream, via the method according to the invention. The ammonia inlet of the stripper column is generally a liquid inlet. The ammonia inlet can also be referred to as waste stream inlet. The stripper column may further comprise at least one liquid outlet for discharging the liquid stripped effluent. The ammonia inlet of the absorber column is generally a gas inlet. The absorber column may further comprise at least one gas outlet for outlet of off gas or clean gas. The stripper column and absorber column are configured for co-action. In particular is at least part, and preferably all, of the ammonia recovered by the carrier gas in the stripper column supplied to the ammonia inlet of the absorber column. This results in an efficient system for recovering of nitrogen from a waste stream. It is optionally possible that the off gas of the absorber column is used as carrier gas of the stripper column.
It is for example possible that at least a fraction of carbon dioxide is added to the carrier gas which is enriched with ammonia before it is supplied to the ammonia inlet of the absorber column. Hence, at least part of the carbon dioxide can react with the ammonia and water vapour present in the carrier gas to ammonium bicarbonate. This may further increase the yield of ammonium bicarbonate.
It is beneficial if at least a fraction of carbon dioxide is dissolved in water before the carbon dioxide is supplied to the absorbed column via the at least one water and carbon dioxide inlet. With this embodiment it is for example enabled that the substantially liquid stream of water and carbon dioxide can be easily sprayed within the absorber column. This may contribute to obtaining a relatively large contact area between carbon dioxide and ammonia, which can be gaseous and/or aqueous ammonia, and possibly water. It is in particular beneficial if at least part, and preferably substantially all of the carbon dioxide supplied to the absorber column is recovered from biogas obtained during conversion of biomass into biogas and digestate. In this way a more environmentally friendly system can be obtained wherein nitrogen is recovered.
The invention also relates to the use of carbon dioxide recovered from biogas obtained during biomass conversion of biomass into biogas in digestate, preferably dissolved in water, to recover nitrogen from a waste stream, in particular a biomass waste stream comprising ammonia.
The invention will be further elucidated herein below on the basis of the nonlimitative exemplary embodiment shown in the following figure.
Figure 1 shows a system (100) for recovering of nitrogen from a waste stream according to the invention. The figure shows a biomass conversion plant 11 or a digester 11 which is configured for the conversion of biomass (12) into biogas (13) and digestate (14). The digestate (14) comprises a thin fraction (16) and a thick fraction (17) which is separated in a separation unit (15). The separation unit (15) can be make use of any known separation techniques such as screw-press separation, decanting, centrifugation, belt press separation and/or combination thereof. At least part of the thin fraction (16) can be used as waste stream (1) for use in the method according to the invention. Preferably all of the thin fraction (16) is used as waste stream (1) for use in the method according to the invention. The thin fraction (16) generally contains a relatively high amount of nitrogen, in particular in the form of ammonium and/or ammonia. The thin fraction (16) contains generally at most 6% of dry matter. The thin fraction (16) can optionally be filtered via a filter unit (21) before it is provided as waste stream (1). The biogas (13) obtained during the conversion of biomass (12) can be upgraded into (bio)methane (19) (or green gas (19)) and carbon dioxide (20). The biogas (12) is therefore upgraded in the biogas upgrading unit (18) into (bio)methane (19) and carbon dioxide (20). In a preferred possible embodiment of the invention is at least part of the carbon dioxide (20) obtained during the upgrading of biogas (13) used as carbon dioxide (5) provided for the formation of ammonium bicarbonate (6). Preferably al carbon dioxide (20) obtained during the upgrading of biogas (13) is used within the system (100) according to the invention. During the upgrading of biogas (13) in the biogas upgrading unit (18) is also heat (23) generated. This residual heat (23) of biogas upgrading can for example be used for the heating steps (22, 24, 25) used for the stripper column (7) or absorber column (8). In the shown embodiment comprises the system (100) a stripper column (7) comprising an ammonia inlet (7a) for providing a waste stream comprising ammonia (1) into said stripper column (7), a carrier gas inlet (7b) for providing a carrier gas (2) which is configured to capture ammonia into said stripper column (7), a gas outlet (7c) for discharging carrier gas which is enriched with ammonia (3) and a liquid outlet (7d) for discharging of stripped effluent (10). The waste stream comprising ammonia (1) can be heated via a heater (22) before the waste stream (1) enters the stripper column (7). The carrier gas (2) is generally blown into the stripper column (7), and preferably introduced at a bottom region of the stripper column (7).
The system (100) furthermore comprises an absorber column (8) comprising an ammonia inlet (8a) for providing ammonia into said absorber column (8), a water and carbon dioxide inlet (8b) for providing water (4) and carbon dioxide (5) into said absorber column (8), a liquid outlet (8c) for discharging ammonium bicarbonate solution (6) which is formed when the ammonia recovered by the carrier gas (5) is brought in contact with water and carbon dioxide (4, 5), and a gas outlet (8d) for discharging residual gas (9). This gas (9) is low in nitrogen or even free of nitrogen. It is shown in the figure that the discharged residual gas (9) can be re-used as carrier gas (2) for the stripping of ammonia in the stripper column (7). The carbon dioxide (5) is added to a water stream (4). At least a fraction of carbon dioxide (5) is dissolved in water (4) before the carbon dioxide (5) is supplied to the absorber column (8) where the carbon dioxide (5) is brought into contact with the ammonia recovered by the carrier gas (3). The water stream (4) which is supplied to the absorbed column (8) may be at least partially formed by residual water obtained during the discharging of ammonium bicarbonate solution (6). The temperature of the water (4), in particular the water (4) and carbon dioxide (5) is controlled via a temperature control unit or heat exchanger (24) in order to improve dissolving of at least part of the carbon dioxide (5) into the water (4). The water and carbon dioxide (4, 5) are generally provided at a top region of the absorbed column (8). The figure shows the optional feature that at least a fraction of carbon dioxide (5a, 5b, 5c) is added to the ammonia and carrier gas (3) discharged from the stripper column (7) before this ammonia, carrier gas and carbon dioxide are supplied to the absorber column (8) where they may be brought into contact with water. The added carbon dioxide (5a, 5b, 5c) may already react with the ammonia and water vapour present in the carrier gas (3) and thus form ammonium bicarbonate. A heater or heat exchanger (25) may be present to heat a liquid fraction comprising water, ammonia, carbon dioxide and/or ammonium bicarbonate present in a lower part of the absorber column (8). A pump unit (26) may be used in order to facilitate discharging of the ammonium bicarbonate (6).
It will be apparent that the invention is not limited to the working examples shown and described herein, but that numerous variants are possible within the scope of the attached claims that will be obvious to a person skilled in the art.

Claims (24)

1. Werkwijze voor het winnen van stikstof uit een afvalstroom, in het bijzonder een afvalstroom van biomassa, omvattende de stappen:A method for recovering nitrogen from a waste stream, in particular a biomass waste stream, comprising the steps of: A) het verschaffen van een ammoniak omvattende afvalstroom,A) providing an ammonia-containing waste stream, B) het terugwinnen van de ammoniak uit de afvalstroom door de afvalstroom in contact te brengen met een dragergas welke is ingericht voor het afvangen van ammoniak en bij voorkeur het overdragen van de ammoniak uit de afvalstroom naar het dragergas,B) recovering the ammonia from the waste stream by contacting the waste stream with a carrier gas arranged to capture ammonia and preferably transferring the ammonia from the waste stream to the carrier gas, C) het door het dragergas teruggewonnen ammoniak in contact brengen met water en koolstofdioxide zodat ten minste een fractie van de ammoniak reageert om een ammoniumbicarbonaatoplossing te vormen, enC) contacting ammonia recovered by the carrier gas with water and carbon dioxide so that at least a fraction of the ammonia reacts to form an ammonium bicarbonate solution, and D) het afvoeren van de ammoniumbicarbonaatoplossing.D) draining the ammonium bicarbonate solution. 2. Werkwijze volgens conclusie 1, waarbij ten minste een fractie van het door het dragergas teruggewonnen ammoniak voor en/of tijdens stap C) in water wordt opgelost.A method according to claim 1, wherein at least a fraction of the ammonia recovered by the carrier gas is dissolved in water before and / or during step C). 3. Werkwijze volgens een der voorgaande conclusies, waarbij ten minste een fractie koolstofdioxide in water wordt opgelost voordat de koolstofdioxide in contact wordt gebracht met het door het dragergas teruggewonnen ammoniak.The method of any preceding claim, wherein at least a fraction of carbon dioxide is dissolved in water before the carbon dioxide is contacted with the ammonia recovered by the carrier gas. 4. Werkwijze volgens een conclusie 3, waarbij de temperatuur van het water dat ten minste een fractie koolstofdioxide omvat dat in contact wordt gebracht met het door het dragergas teruggewonnen ammoniak, een temperatuur heeft tussen 0 en 50 graden Celsius, bij voorkeur tussen 20 en 40 graden Celsius.The method according to claim 3, wherein the temperature of the water comprising at least a fraction of carbon dioxide which is contacted with the ammonia recovered by the carrier gas has a temperature between 0 and 50 degrees Celsius, preferably between 20 and 40 degrees Celsius. 5. Werkwijze volgens een der voorgaande conclusies, waarbij de afvalstroom, in het bijzonder de biomassa-afvalstroom, een in hoofdzaak vloeibare afvalstroom is.A method according to any one of the preceding claims, wherein the waste stream, in particular the biomass waste stream, is a substantially liquid waste stream. 6. Werkwijze volgens een der voorgaande conclusies, waarbij de afvalstroom, in het bijzonder de biosmassa-afvalstroom, afkomstig is van digestaat, in het bijzonder digestaat verkregen tijdens de omzetting van biomassa in biogas en digestaat.A method according to any one of the preceding claims, wherein the waste stream, in particular the biomass waste stream, comes from digestate, in particular digestate obtained during the conversion of biomass into biogas and digestate. 7. Werkwijze volgens conclusie 6, waarbij ten minste een deel van de afvalstroom wordt gevormd door de dunne fractie van digestaat.The method of claim 6, wherein at least a portion of the waste stream is the thin fraction of digestate. 8. Werkwijze volgens een der voorgaande conclusies, waarbij de afvalstroom, in het bijzonder de biomassa-afvalstroom, gefilterd wordt voordat genoemde afvalstroom in contact wordt gebracht met het dragergas dat is ingericht voor het afvangen van ammoniak.A method according to any one of the preceding claims, wherein the waste stream, in particular the biomass waste stream, is filtered before said waste stream is brought into contact with the carrier gas arranged for capturing ammonia. 9. Werkwijze volgens een der voorgaande conclusies, waarbij ten minste een deel, en bij voorkeur in hoofdzaak alle koolstofdioxide toegevoerd tijdens stap C) is teruggewonnen uit biogas verkregen door de omzetting van biomassa in biogas en digestaat.A method according to any one of the preceding claims, wherein at least a part, and preferably substantially all of the carbon dioxide supplied during step C) is recovered from biogas obtained by the conversion of biomass into biogas and digestate. 10. Werkwijze volgens een der voorgaande conclusies, waarbij ten minste een fractie koolstofdioxide wordt toegevoegd aan het ammoniak en dragergas verkregen tijdens stap B) voordat deze ammoniak, dragergas en koolstofdioxide in contact worden gebracht met water.A method according to any one of the preceding claims, wherein at least a fraction of carbon dioxide is added to the ammonia and carrier gas obtained during step B) before these ammonia, carrier gas and carbon dioxide are contacted with water. 11. Werkwijze volgens een der voorgaande conclusies, verder omvattende de stap van het koelen, en in het bijzonder kristalliseren, van de ammoniumbicarbonaatoplossing.A method according to any one of the preceding claims, further comprising the step of cooling, and in particular crystallizing, the ammonium bicarbonate solution. 12. Werkwijze volgens een der voorgaande conclusies, waarbij het dragergas lucht, stikstof en/of koolstofdioxide omvat.A method according to any one of the preceding claims, wherein the carrier gas comprises air, nitrogen and / or carbon dioxide. 13. Werkwijze volgens een der voorgaande conclusies, waarbij stap B) wordt uitgevoerd middels gebruikte maken van ten minste één kolomstripper.A method according to any one of the preceding claims, wherein step B) is performed using at least one column stripper. 14. Werkwijze volgens een der voorgaande conclusies, waarbij stap C) wordt uitgevoerd middels gebruikte maken van ten minste een absorptiekolom.A method according to any one of the preceding claims, wherein step C) is carried out by using at least one absorption column. 15. Werkwijze volgens een der voorgaande conclusies, waarbij het tijdens stapThe method of any preceding claim, wherein the step B) gebruikte dragergas is koolstofdioxide restant verkregen tijdens stap B).B) used carrier gas is carbon dioxide residue obtained during step B). 16. Werkwijze volgens een der voorgaande conclusies, waarbij de pH van de afvalstroom voor stap A) wordt aangepast, bij voorkeur door toevoeging van NaOH, CaO en/of CaOH.A method according to any one of the preceding claims, wherein the pH of the waste stream for step A) is adjusted, preferably by adding NaOH, CaO and / or CaOH. 17. Werkwijze volgens conclusie 16, waarbij de pH zodanig wordt aangepast dat de pH van de afvalstroom is gelegen tussen 7 en 11, bij voorkeur tussen 8 en 10, bij nadere voorkeur tussen 9 en 10.A method according to claim 16, wherein the pH is adjusted such that the pH of the waste stream is between 7 and 11, preferably between 8 and 10, more preferably between 9 and 10. 18. Werkwijze volgens een der voorgaande conclusies, waarbij de temperatuur van de afvalstroom wordt verhoogd voor stap A).A method according to any one of the preceding claims, wherein the temperature of the waste stream is increased before step A). 19. Werkwijze volgens conclusie 18, waarbij de temperatuur wordt verhoogd middels het verwarmen van de afvalstroom naar een temperatuur tussen 30 en 80 graden Celsius, bij voorkeur tussen 40 en 70 graden Celsius en bij nadere voorkeur tussen 50 en 60 graden Celsius.A method according to claim 18, wherein the temperature is increased by heating the waste stream to a temperature between 30 and 80 degrees Celsius, preferably between 40 and 70 degrees Celsius and more preferably between 50 and 60 degrees Celsius. 20. Systeem voor het winnen van stikstof uit een afvalstroom, in het bijzonder een afvalstroom van biomassa, omvattende:System for recovering nitrogen from a waste stream, in particular a biomass waste stream, comprising: - een kolomstripper, omvattende:- a column stripper, comprising: o ten minste één ammoniakinlaat voor het verschaffen van een ammoniak omvattende afvalstroom in voornoemde kolomstripper, o ten minste één dragergasinlaat voor het verschaffen van een dragergas welke is ingericht voor het afvangen van ammoniak in genoemde kolomstripper, o ten minste één gasafvoer voor het afvoeren van dragergas dat is verrijkt met ammoniak, eno at least one ammonia inlet for providing an ammonia-containing waste stream in said column stripper, o at least one carrier gas inlet for providing a carrier gas which is arranged for capturing ammonia in said column stripper, o at least one gas outlet for the removal of carrier gas that is enriched with ammonia, and - absorptiekolom, omvattende:- absorption column, comprising: o ten minste één ammoniakinlaat voor het verschaffen van ammoniak in voornoemde absorptiekolom, o ten minste één water- en koolstofdioxideinlaat voor het verschaffen van water en koolstofdioxide in voornoemde absorptiekolom, en o ten minste één vloeistofafvoer voor het afvoeren van ammoniumbicarbonaatoplossing dat wordt gevormd wanneer het door het dragergas teruggewonnen ammoniak in contact wordt gebracht met water en koolstofdioxide, waarbij het systeem zodanig is ingericht dat ten minste een deel, en bij voorkeur in hoofdzaak alle door het dragergas teruggewonnen ammoniak wordt toegevoerd aan de ammoniakinlaat van de absorptiekolom.o at least one ammonia inlet for providing ammonia in said absorption column, o at least one water and carbon dioxide inlet for providing water and carbon dioxide in said absorption column, and o at least one liquid drain for discharging ammonium bicarbonate solution formed when passing through the carrier gas recovered ammonia is contacted with water and carbon dioxide, the system being arranged such that at least a portion, and preferably substantially all of the ammonia recovered by the carrier gas, is fed to the ammonia inlet of the absorption column. 21. Systeem volgens conclusie 20, waarbij ten minste een fractie koolstofdioxide wordt toegevoegd aan het met ammoniak verrijkte dragergas voordat het wordt toegevoerd aan de ammoniakinlaat van de absorptiekolom.The system of claim 20, wherein at least a fraction of carbon dioxide is added to the ammonia-enriched carrier gas before it is fed to the ammonia inlet of the absorption column. 22. Systeem volgens conclusie 20 of 21, waarbij ten minste een fractie koolstofdioxide wordt opgelost in water voordat de koolstofdioxide wordt toegevoerd aan de absorptiekolom via de ten minste ene water- en koolstofdioxideinlaat.The system of claim 20 or 21, wherein at least a fraction of carbon dioxide is dissolved in water before the carbon dioxide is supplied to the absorption column through the at least one water and carbon dioxide inlet. 23. Systeem volgens een der conclusies 20-22, waarbij ten minst een deel, en bij voorkeur in hoofdzaak alle koolstofdioxide dat is toegevoerd aan de absorptiekolom is teruggewonnen uit biogas dat is verkregen tijdens de omzetting van biomassa in biogas en digestaat.The system of any one of claims 20-22, wherein at least a portion, and preferably substantially all of the carbon dioxide supplied to the absorption column, is recovered from biogas obtained during the conversion of biomass to biogas and digestate. 24. Het gebruik van koolstofdioxide dat is teruggewonnen uit biogas dat is verkregen tijdens de omzetting van biomassa in biogas en digestaat, bij voorkeur opgelost in water, om stikstof terug te winnen uit een afvalstroom, in het bijzonder een biomassa-afvalstroom die ammoniak omvat.24. The use of carbon dioxide recovered from biogas obtained during the conversion of biomass to biogas and digestate, preferably dissolved in water, to recover nitrogen from a waste stream, in particular a biomass waste stream comprising ammonia.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19615063C1 (en) * 1996-04-17 1997-09-11 Biogas Bernstein Gmbh Biotechn Nitrogen recovery from liquid manure or agricultural effluent
US7811455B2 (en) * 2007-06-07 2010-10-12 Burke Dennis A Removal of ammonia from fermentation effluent and sequestration as ammonium bicarbonate and/or carbonate
WO2013165533A1 (en) * 2012-05-04 2013-11-07 Robert Hickey Ammonium recovery methods
CN105731751A (en) * 2016-02-02 2016-07-06 中国科学院成都有机化学有限公司 System and method for co-producing bio-natural gas and ammonium bicarbonate from dried livestock and poultry manure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19615063C1 (en) * 1996-04-17 1997-09-11 Biogas Bernstein Gmbh Biotechn Nitrogen recovery from liquid manure or agricultural effluent
US7811455B2 (en) * 2007-06-07 2010-10-12 Burke Dennis A Removal of ammonia from fermentation effluent and sequestration as ammonium bicarbonate and/or carbonate
WO2013165533A1 (en) * 2012-05-04 2013-11-07 Robert Hickey Ammonium recovery methods
CN105731751A (en) * 2016-02-02 2016-07-06 中国科学院成都有机化学有限公司 System and method for co-producing bio-natural gas and ammonium bicarbonate from dried livestock and poultry manure

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