CN217809014U - Anaerobic fermentation liquid resource recovery device - Google Patents
Anaerobic fermentation liquid resource recovery device Download PDFInfo
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- CN217809014U CN217809014U CN202221078994.5U CN202221078994U CN217809014U CN 217809014 U CN217809014 U CN 217809014U CN 202221078994 U CN202221078994 U CN 202221078994U CN 217809014 U CN217809014 U CN 217809014U
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Abstract
The utility model relates to an anaerobism zymotic fluid resource recovery unit. The device comprises a fermentation liquor storage container, a first membrane separator, a first intermediate container, a coagulating sedimentation mechanism, a second intermediate container, a second membrane separator, a first alkali liquor storage container, a second alkali liquor storage container, a salt solution storage container and an acid liquor storage container. The utility model discloses can realize retrieving the separation of resources such as VFA, phosphorus, ammonia nitrogen among the anaerobic fermentation liquid, simple process easily operates, the flow is short, with low costs.
Description
Technical Field
The utility model relates to a refuse treatment technical field especially relates to an anaerobism zymotic fluid resource recovery unit.
Background
At present, kitchen garbage and other perishable organic garbage have generated great pressure on municipal administration and environment, and the development of a technology capable of treating and utilizing the perishable organic garbage has great significance.
The anaerobic fermentation technology can realize the harmless treatment and resource utilization of perishable organic garbage, and is considered to be the biomass garbage treatment technology with the widest application and the most promising prospect. The anaerobic fermentation technology can decompose organic matters to generate intermediate products such as Volatile Fatty Acid (VFA), ammonia nitrogen, phosphate and the like. These intermediates have a high economic value. Wherein VFA is short-chain volatile organic acid with 6 carbon atoms or less, such as acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid and the like, and can be used as a carbon source of a sewage plant or further purified into chemical raw materials. After ammonia nitrogen is extracted and recovered, the ammonia nitrogen can be used as a nitrogen fertilizer. After being extracted and recycled, the phosphate can be used as a phosphate fertilizer. These are important resources. If the resources can be recovered from the fermentation liquor, the resource recovery and utilization of the organic solid waste can be realized, and the method has great economic benefit potential.
However, in the fermentation liquid produced by anaerobic fermentation, various fermentation products are mixed together, so that better separation and recovery are difficult to realize, and the traditional processes such as distillation, ion exchange and the like have the problems of complex process, long flow, high cost and the like.
SUMMERY OF THE UTILITY MODEL
Therefore, the anaerobic fermentation liquid resource recovery device is simple in process, easy to operate, short in process and low in cost, and separation and recovery of VFA, phosphorus, ammonia nitrogen and other resources in anaerobic fermentation liquid are achieved.
An anaerobic fermentation liquor resource recovery device comprises a fermentation liquor storage container, a first membrane separator, a first intermediate container, a coagulating sedimentation mechanism, a second intermediate container, a second membrane separator, a first alkali liquor storage container, a second alkali liquor storage container, a salt solution storage container and an acid liquor storage container;
the first membrane separator is provided with a first chamber and a second chamber which are separated by a first separation membrane, the second membrane separator is provided with a third chamber and a fourth chamber which are separated by a second separation membrane, the fermentation liquor storage container, the first chamber, the first intermediate container, the coagulating sedimentation mechanism, the second intermediate container and the third chamber are sequentially communicated, the first alkali liquor storage container is communicated with the second chamber and used for conveying first alkali liquor to the second chamber, the acid liquor storage container is communicated with the fourth chamber and used for conveying acid liquor to the fourth chamber, the second alkali liquor storage container is communicated with the coagulating sedimentation mechanism and used for conveying second alkali liquor to the coagulating sedimentation mechanism, and the salt solution storage container is communicated with the coagulating sedimentation mechanism and used for conveying salt solution to the coagulating sedimentation mechanism.
In one embodiment, the fermentation broth storage vessel is in bidirectional communication with the first chamber via different conduits.
In one embodiment the second intermediate container is in bi-directional communication with the third chamber via different conduits.
In one embodiment, the first lye storage container is in bidirectional communication with the second chamber via different conduits.
In one embodiment, the anaerobic fermentation liquid resource recovery device further comprises a first heat exchanger, and the first heat exchanger is arranged on a pipeline which communicates the liquid outlet of the second chamber and the liquid inlet of the first alkali liquor storage container.
In one embodiment, the acid storage container and the fourth chamber are in bidirectional communication through different conduits.
In one embodiment, the anaerobic fermentation broth resource recovery device further comprises a second heat exchanger, and the second heat exchanger is arranged on a pipeline which communicates the liquid outlet of the fourth chamber and the liquid inlet of the acid liquor storage container.
In one embodiment, a stirring component is arranged in the coagulating sedimentation mechanism.
In one embodiment, the lower end of the coagulating sedimentation mechanism is provided with a sediment discharge hole which can be opened or closed.
In one embodiment, the anaerobic fermentation broth resource recovery device further comprises at least one transfer pump, and the transfer pump is arranged on one or more of the following pipelines:
a pipeline for communicating the fermentation liquor storage container with the first chamber,
A conduit communicating the first chamber and the first intermediate container,
A pipeline for communicating the first intermediate container and the coagulating sedimentation mechanism,
A pipeline for communicating the coagulating sedimentation mechanism and the second intermediate container,
A conduit communicating the second intermediate container and the third chamber,
A pipeline which is communicated with the first alkali liquor storage container and the second chamber,
A pipeline for communicating the acid liquor storage container with the fourth chamber,
A pipeline for communicating the second alkali liquor storage container with the coagulating sedimentation mechanism, and
and the pipeline is communicated with the saline solution storage container and the coagulating sedimentation mechanism.
Compared with the traditional scheme, the anaerobic fermentation liquid resource recovery device has the following beneficial effects:
according to the anaerobic fermentation liquid resource recovery device, anaerobic fermentation liquid flows in the first cavity of the first membrane separator, first alkali liquor flows in the second cavity, so that the first alkali liquor absorbs VFA in the anaerobic fermentation liquid, the first alkali liquor absorbs the VFA to form carboxylate solution, first intermediate liquid obtained after separation of the VFA is added into a coagulating sedimentation mechanism, second alkali liquor and the salt solution are added for reaction, phosphate precipitation is obtained, second intermediate liquid obtained after separation of the phosphate precipitation is introduced into the third cavity of the second membrane separator, and acid liquid flows in the fourth cavity, so that the acid liquid absorbs ammonia nitrogen in the second intermediate liquid. Thus, the recovery of VFA, phosphorus and ammonia nitrogen in anaerobic fermentation liquor can be respectively realized. The three recovery links are reasonably arranged, the pH value requirement of each link is met, simultaneously, the acidic characteristic of the fermentation liquor and the change characteristic of the acidity and alkalinity in the extraction process are utilized, the adding of acid and alkali agents is reduced to the maximum extent, the process is simple and easy to operate, the flow is short, the occupied area is small, the energy consumption is low, the medicine consumption is low, and therefore the cost is low.
Drawings
FIG. 1 is a schematic structural diagram of an anaerobic fermentation broth resource recovery device according to an embodiment;
FIG. 2 is a schematic view of the structure of a first membrane separator using a flat sheet membrane;
FIG. 3 is a schematic structural view of a first membrane separator using hollow fiber membrane filaments;
FIG. 4 is a schematic view of the structure of a first membrane separator using a tubular membrane.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully below. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of indicated technical features is significant. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include at least one of the feature.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an anaerobic fermentation broth resource recycling device 10 according to an embodiment of the present invention includes a fermentation broth storage container 101, a first membrane separator 102, a first intermediate container 103, a coagulating sedimentation mechanism 104, a second intermediate container 105, a second membrane separator 106, a first alkali solution storage container 107, a second alkali solution storage container 108, a salt solution storage container 109, and an acid solution storage container 110.
The first membrane separator 102 has a first chamber and a second chamber separated by a first separation membrane. The second membrane separator 106 has a third chamber and a fourth chamber separated by a second separation membrane.
The fermentation liquid storage container 101, the first chamber, the first intermediate container 103, the coagulating sedimentation mechanism 104, the second intermediate container 105 and the third chamber are sequentially communicated. In the treatment process, the anaerobic fermentation liquid sequentially passes through the components, and Volatile Fatty Acid (VFA), phosphate and ammonia nitrogen are sequentially separated.
The primary alkali fluid storage container 107 is in communication with the second chamber for conveying the primary alkali fluid to the second chamber.
An acid storage container 110 is in communication with the fourth chamber for delivering acid to the fourth chamber.
The second lye storage container 108 is communicated with the coagulating sedimentation mechanism 104 for conveying the second lye to the coagulating sedimentation mechanism 104.
The saline solution storage container 109 is in communication with the coagulating sedimentation mechanism 104 for delivering saline solution to the coagulating sedimentation mechanism 104.
Wherein the fermentation liquor storage container 101, the first membrane separator 102 and the first lye storage container 107 constitute a VFA separation assembly for separating VFA from the anaerobic fermentation liquor.
The organic solid waste is decomposed into intermediate metabolites such as VFA, ammonia nitrogen, phosphate and the like under the action of microorganisms through an anaerobic fermentation process, and the substances are mixed in anaerobic fermentation liquor. The fermentation broth storage vessel 101 is used to store anaerobic fermentation broth to be treated.
The primary alkali storage container 107 is used for storing the primary alkali and for feeding the primary alkali to the first chamber of the first membrane separator 102.
The first membrane separator 102 is used to separate VFA from the anaerobic fermentation broth. The first membrane separator 102 has a first chamber and a second chamber, which are separated by a first separation membrane. Anaerobic fermentation liquor flows through the first chamber, and first alkali liquor flows through the second chamber. The VFA passes through the first separation membrane in the form of volatile gas under the acidic condition and is absorbed by the first alkali liquor in the second chamber, and other components in the anaerobic fermentation liquid cannot permeate through the first separation membrane, so that the selective absorption and extraction of the VFA in the anaerobic fermentation liquid are realized.
The first separation membrane in the first membrane separator 102 serves as a barrier to separate the VFA-containing anaerobic fermentation liquid from the first alkali liquor, and with the concentration difference of free VFAs at both sides of the first separation membrane as a driving force, the free VFA in the anaerobic fermentation liquid enters the micropores of the first separation membrane in a gaseous molecular form through diffusion, diffuses to the second chamber through the micropores, and is rapidly and irreversibly absorbed by the alkali liquor to generate carboxylate ions, such as acetate ions, propionate ions, butyrate ions, and the like. The carboxylate (such as sodium acetate, sodium propionate, sodium butyrate, sodium isobutyrate and the like) in the alkali liquor is gradually increased and finally converted into carboxylate solution, and the high-purity carboxylate can be obtained after the carboxylate solution is concentrated and crystallized step by step.
In one example, the primary lye storage container 107 is in bidirectional communication with the second chamber via different conduits. In this way, the primary lye may circulate between the primary lye storage containers 107 and the second chamber.
Further, in one example, the anaerobic fermentation liquid resource recovery device 10 further comprises a first heat exchanger (not shown in the figure), and the first heat exchanger is arranged on a pipeline which is communicated with the liquid outlet of the second chamber and the liquid inlet of the first alkali liquor storage container 107. The first heat exchanger can heat the first alkali liquor in a water bath manner so as to keep the temperature of the first alkali liquor and the temperature of the anaerobic fermentation liquor basically the same, and reduce the phenomenon of osmotic distillation caused by the temperature difference between the first alkali liquor and the anaerobic fermentation liquor in the operation process.
The first separation membrane is preferably a hydrophobic membrane, and the material thereof may be, for example, but not limited to, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polypropylene (PP), a composite polymer material, and the like, and can preferably prevent other components in the anaerobic fermentation liquid from permeating the first separation membrane.
In one example, the first separation membrane has a pore size of 0.02 to 0.4 μm. Further, in one example, the first separation membrane has a pore size of 0.1 to 0.3 μm.
The first separation membrane may be, but not limited to, a flat sheet membrane, a hollow fiber membrane, a tubular membrane, and the like.
As shown in fig. 2, in one example, the first separation membrane 1031 of the first membrane separator 103 is a flat membrane which is arranged in a plane in the internal chamber. In this example, the first chamber 1032 and the second chamber 1033 are oppositely disposed. An inlet 1034 and an outlet 1035 are formed at opposite ends of the first chamber 1032. The second chamber 1033 has opposite ends that are open to a liquid inlet 1036 and a liquid outlet 1037, respectively.
Further, a plurality of first flow deflectors 1038 and a plurality of second flow deflectors 1039 are provided in the first chamber, one end of the first flow deflector 1038 is connected to the wall of the inner chamber, one end of the second flow deflector 1039 is connected to the first separation membrane 1031, and the first flow deflectors 1038 and the second flow deflectors 1039 are arranged in parallel and alternately, thereby forming a meandering flow path in the first chamber 1032. So set up and to reduce the liquid short-term flow, improve the separation effect. Similarly, a baffle may be provided in the second chamber 1033 to achieve the above-described effect.
As shown in fig. 3, in one example, the first separation membrane 1031 'of the first membrane separator 103' employs a plurality of hollow fiber membrane filaments. The first separation membrane 1031' is connected at its opposite ends to the chamber shell 1035' by means of respective sealing tips 1034 '. The first separation membrane 1031' has a first chamber 1032' on the inner side for flowing anaerobic fermentation liquid and a second chamber 1033' on the outer side for flowing the first alkali liquid.
As shown in fig. 4, in one example, the first separation membrane 1031 "of the first membrane separator 103" is a tubular membrane. The first separation membrane 1031 "is connected at each end to the chamber housing 1035" by a respective sealing tip 1034 ". The first separation membrane 1031' has a first chamber 1032' on the inner side for flowing anaerobic fermentation liquid and a second chamber 1033' on the outer side for flowing first alkali liquid.
The pH value of the fermentation liquor is low (about 3-5) due to the existence of organic acids such as VFA in the anaerobic fermentation liquor, and the pH value of the anaerobic fermentation liquor gradually rises to about 5 along with the selective absorption of the VFA in the anaerobic fermentation liquor. The pH value of the first alkali liquor will gradually decrease, and when the pH value decreases to about 9 (such as 7.8-8.2), the alkali liquor needs to be replaced.
In one example, the anaerobic fermentation broth resource recovery device 10 further comprises a first weighing mechanism (not shown in the figure) for weighing the first lye storage containers 107 in real time. The condition that the first separation membrane is penetrated due to the pollution of the first separation membrane can be early warned through the change of the weighing indication of the first separation membrane. Specifically, if the weighing indication becomes smaller, which indicates that the first separation membrane is penetrated, the first lye enters the first chamber, and the new separation membrane should be replaced in time.
The first intermediate container 103, the coagulating sedimentation mechanism 104, the second lye storage container 108 and the salt solution storage container 109 constitute a phosphorus separation assembly for separating phosphate from the anaerobic fermentation broth.
Anaerobic fermentation liquor is subjected to VFA separation, enters a first intermediate container 103 for storage, and is conveyed to a coagulating sedimentation mechanism 104.
The second alkali liquid storage container 108 is used for storing the second alkali liquid and conveying the second alkali liquid to the coagulating sedimentation mechanism 104, so as to raise the pH value.
The saline solution storage container 109 is used for storing saline solution and delivering the saline solution to the coagulating sedimentation mechanism 104. The salt solution may be, for example, but not limited to, a magnesium salt solution, an aluminum salt solution, an iron salt solution, and the like. Wherein, magnesium salt solution is adopted, when the pH value of the anaerobic fermentation liquor in the coagulating sedimentation mechanism 104 is increased to 9-10 (preferably 9.0-9.5), NH in the anaerobic fermentation liquor 4+ And PO 4 3- With added Mg 2+ Precipitation reaction occurs to generate magnesium ammonium phosphate (MgNH) 4 PO 4 ) I.e., struvite. At itIn one example, the salt solution is MgCl 2 And (3) solution.
The lower end of the coagulating sedimentation mechanism 104 may be provided with a sediment outlet that can be opened or closed. And (4) carrying out solid-liquid separation on the precipitate to obtain magnesium ammonium phosphate solid of phosphorus, and taking out the magnesium ammonium phosphate solid from a precipitate discharge port.
In one example, the coagulating sedimentation mechanism 104 is provided with a stirring member therein, and the precipitation reaction is promoted by stirring.
The second intermediate container 105, the second membrane separator 106 and the acid liquor storage container 110 form an ammonia nitrogen separation assembly for separating ammonia nitrogen from anaerobic fermentation liquor.
The second intermediate vessel 105 is used to store the anaerobic fermentation broth after phosphorus separation.
The acid storage container 110 is used to store and deliver acid to the third chamber of the second membrane separator 106.
The second membrane separator 106 is used for separating ammonia nitrogen from anaerobic fermentation liquor. The second membrane separator 106 has a third chamber and a fourth chamber, which are separated by a second separation membrane. Anaerobic fermentation liquor flows through the third chamber, and acid liquor flows through the second chamber. Ammonia nitrogen is used as volatile gas (NH) under alkaline condition 3 ) The ammonia nitrogen in the anaerobic fermentation liquor can be selectively absorbed and extracted by the acid liquor in the fourth chamber through the second separation membrane, while other components in the anaerobic fermentation liquor can not permeate through the second separation membrane.
The second separation membrane in the second membrane separator 106 serves as a barrier to separate the anaerobic fermentation liquid containing ammonia nitrogen from the acid liquid, the concentration difference of free ammonia on two sides of the second separation membrane is used as a driving force, free ammonia in the anaerobic fermentation liquid enters the micropores of the second separation membrane through diffusion, diffuses to the fourth chamber through the micropores, and is rapidly and irreversibly absorbed by the acid liquid to generate ammonium ions. The acid liquor continuously and circularly absorbs ammonia nitrogen to gradually become ammonium salt solution (ammonium salt comprises ammonium sulfate and ammonium bisulfate), and the ammonium salt solution is concentrated and crystallized to obtain high-purity ammonium salt.
In one example, the acid storage container 110 is in bi-directional communication with the third chamber through different conduits. As such, acid may circulate between the acid storage container 110 and the third chamber.
Further, in one example, the anaerobic fermentation broth resource recovery device 10 further comprises a second heat exchanger (not shown in the figure) disposed on the pipeline connecting the liquid outlet of the fourth chamber and the liquid inlet of the acid storage container 110. The second heat exchanger can heat the acid liquor in a water bath to keep the temperature of the acid liquor and the temperature of the second intermediate feed liquid basically the same, and reduce the osmotic distillation phenomenon caused by the temperature difference between the acid liquor and the second intermediate feed liquid in the operation process.
The structure of the second membrane separator 106 may be referred to the first membrane separator 102 and will not be described in detail.
With the selective absorption and extraction of ammonia nitrogen in the anaerobic fermentation broth, the pH gradually decreases to around 8. The pH value of the acid solution will gradually rise, and when the pH value is reduced to about 5, the acid solution needs to be replaced.
In one example, the anaerobic fermentation broth resource recovery device 10 further comprises a second weighing mechanism (not shown) for weighing the acid storage container 110 in real time. The condition that the second separation membrane is penetrated due to the pollution of the second separation membrane can be early warned through the change of the weighing readings of the second separation membrane. Specifically, if the weighing index becomes small, indicating that the second separation membrane is penetrated, the acid solution enters the third chamber, and a new separation membrane should be replaced in time.
In the above embodiments, the communication means communication through a pipeline, wherein a delivery pump may be further disposed on the pipeline for delivering the liquid. For liquid delivery requiring accurate quantification, the delivery pump can be a metering pump. For example on one or more of the following pipes:
a pipeline for communicating the fermentation liquor storage container 101 with the first chamber, a pipeline for communicating the first chamber with the first intermediate container 103, a pipeline for communicating the first intermediate container 103 with the coagulating sedimentation mechanism 104, a pipeline for communicating the coagulating sedimentation mechanism 104 with the second intermediate container 105, a pipeline for communicating the second intermediate container 105 with the third chamber, a pipeline for communicating the first alkali liquor storage container 107 with the second chamber, a pipeline for communicating the acid liquor storage container 110 with the fourth chamber, a pipeline for communicating the second alkali liquor storage container 108 with the coagulating sedimentation mechanism 104, and a pipeline for communicating the salt solution storage container 109 with the coagulating sedimentation mechanism 104.
In the specific example shown in fig. 1, a first transfer pump 111, which is a peristaltic pump, is disposed on a pipe connecting the fermentation liquid storage container 101 and the first chamber. A second delivery pump 112, which is a peristaltic pump, is arranged on the pipeline connecting the first intermediate container 103 and the coagulating sedimentation mechanism 104. The conduit connecting the second intermediate container 105 and the third chamber is provided with a third transfer pump 113, which is a peristaltic pump. A fourth delivery pump 114 is arranged on the pipeline connecting the first lye storage container 107 and the second chamber, and adopts a peristaltic pump. A fifth delivery pump 115, which is a peristaltic pump, is disposed on the pipeline connecting the acid storage container 110 and the fourth chamber. And a sixth delivery pump 116 which adopts a metering pump is arranged on a pipeline for communicating the second alkali liquor storage container 108 and the coagulating sedimentation mechanism 104. A seventh delivery pump 117, which is a metering pump, is arranged on the pipeline connecting the saline solution storage container 109 and the coagulating sedimentation mechanism 104.
Further, the present invention also provides a method for recycling anaerobic fermentation broth resources, using the anaerobic fermentation broth resource recycling device 10 of any of the above examples, the method for recycling anaerobic fermentation broth resources comprises the following steps:
anaerobic fermentation liquor flows in the first chamber, first alkali liquor flows in the second chamber, the first alkali liquor absorbs VFA in the anaerobic fermentation liquor, and first intermediate feed liquid is obtained after the VFA is separated from the anaerobic fermentation liquor and is stored in a first intermediate container 103;
adding a first intermediate feed liquid into the coagulating sedimentation mechanism 104, adding a second alkali liquid and a salt solution into the coagulating sedimentation mechanism 104 for reaction to obtain phosphate precipitates, separating the phosphate precipitates from the first intermediate feed liquid to obtain a second intermediate feed liquid, and storing the second intermediate feed liquid in a second intermediate container 105;
and flowing a second intermediate feed liquid in the third cavity and flowing an acid liquid in the fourth cavity, so that the acid liquid absorbs ammonia nitrogen in the second intermediate feed liquid.
Optionally, the first alkali solution may be selected from, but not limited to, one or more of sodium hydroxide and potassium hydroxide. In one example, the first alkaline solution is a sodium hydroxide solution, preferably with an initial concentration of 0.2 to 1mol/L, more preferably 0.4 to 0.8mol/L.
The first lye circulates between the fermentation broth storage container 101 and the first chamber, and the pH of the first lye gradually decreases during absorption of the VFA. The pH value is monitored, and when the pH value is reduced to 7.8-8.2, the alkali liquor needs to be replaced by new alkali liquor.
The flow rate of the primary alkali solution is preferably matched to the volume of the fermentation liquid storage container 101, and is selected in a direct proportion relationship. Specifically, when the volume of the fermentation liquid storage container 101 is 1L, the flow rate of the first alkali solution is preferably 10 to 50mL/min, and more preferably 20 to 40mL/min.
Optionally, the acid solution may be selected from, but not limited to, one or more of sulfuric acid, hydrochloric acid, and nitric acid. In one example, the acid solution is sulfuric acid, preferably with an initial concentration of 1 to 2mol/L, more preferably 0.2 to 0.4mol/L.
The acid liquor circulates between the second intermediate container 105 and the third chamber, and the pH of the acid liquor gradually rises during the absorption of ammonia nitrogen. The pH value of the acid liquor is monitored, and when the pH value of the acid liquor rises to 1.8-2.2, the acid liquor needs to be replaced by new acid liquor.
The flow rate of the acid liquid is preferably matched to the volume of the second intermediate container 105, which is chosen in direct proportion. Specifically, when the volume of the second intermediate container 105 is 1L, the flow rate of the acid solution is preferably 10 to 50mL/min, and more preferably 20 to 40mL/min.
Optionally, the second alkaline solution may be selected from, but not limited to, one or more of sodium hydroxide and potassium hydroxide. In one example, the second alkali solution is sodium hydroxide solution, and the concentration is preferably 1-2 mol/L.
Alternatively, the salt solution may be selected from, but not limited to, one or more of a magnesium salt solution, an aluminum salt solution, and an iron salt solution. In one example, the salt solution is MgCl 2 The concentration of the solution is preferably 0.5 to 1mol/L.
According to the anaerobic fermentation liquid resource recovery device, anaerobic fermentation liquid flows in the first cavity of the first membrane separator, first alkali liquor flows in the second cavity, so that the first alkali liquor absorbs VFA in the anaerobic fermentation liquid, the first alkali liquor absorbs the VFA to form carboxylate solution, a coagulating sedimentation mechanism is added into first intermediate liquid obtained after VFA is separated, second alkali liquor and the salt solution are added for reaction, phosphate precipitation is obtained, second intermediate liquid obtained after the phosphate precipitation is separated is introduced into the third cavity of the second membrane separator, and acid liquor flows in the fourth cavity, so that the acid liquor absorbs ammonia nitrogen in the second intermediate liquid. Thus, the recovery of VFA, phosphorus and ammonia nitrogen in the anaerobic fermentation liquid can be respectively realized. The three recovery links are reasonably arranged, the pH value requirement of each link is met, simultaneously, the acidic characteristic of the fermentation liquor and the change characteristic of the acidity and alkalinity in the extraction process are utilized, the adding of acid and alkali agents is reduced to the maximum extent, the process is simple and easy to operate, the flow is short, the occupied area is small, the energy consumption is low, the medicine consumption is low, and therefore the cost is low.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An anaerobic fermentation liquor resource recovery device is characterized by comprising a fermentation liquor storage container, a first membrane separator, a first intermediate container, a coagulating sedimentation mechanism, a second intermediate container, a second membrane separator, a first alkali liquor storage container, a second alkali liquor storage container, a salt solution storage container and an acid liquor storage container;
the first membrane separator is provided with a first chamber and a second chamber which are separated by a first separation membrane, the second membrane separator is provided with a third chamber and a fourth chamber which are separated by a second separation membrane, the fermentation liquor storage container, the first chamber, the first intermediate container, the coagulating sedimentation mechanism, the second intermediate container and the third chamber are sequentially communicated, the first alkali liquor storage container is communicated with the second chamber and used for conveying first alkali liquor to the second chamber, the acid liquor storage container is communicated with the fourth chamber and used for conveying acid liquor to the fourth chamber, the second alkali liquor storage container is communicated with the coagulating sedimentation mechanism and used for conveying second alkali liquor to the coagulating sedimentation mechanism, and the salt solution storage container is communicated with the coagulating sedimentation mechanism and used for conveying salt solution to the coagulating sedimentation mechanism.
2. The anaerobic fermentation broth resource recovery device as claimed in claim 1, wherein the fermentation broth storage vessel is in bidirectional communication with the first chamber through different pipes.
3. The anaerobic fermentation broth resource recovery device as claimed in claim 1, wherein the second intermediate container and the third chamber are in bidirectional communication through different pipes.
4. The anaerobic fermentation broth resource recovery device as claimed in any one of claims 1 to 3, wherein the primary alkali liquid storage container and the secondary chamber are in bidirectional communication through different pipes.
5. The anaerobic fermentation broth resource recovery device as claimed in claim 4, wherein the anaerobic fermentation broth resource recovery device further comprises a first heat exchanger disposed on the pipeline connecting the liquid outlet of the second chamber and the liquid inlet of the first lye storage container.
6. The anaerobic fermentation broth resource recovery device as claimed in any one of claims 1 to 3, wherein the acid storage container and the fourth chamber are in bidirectional communication through different pipes.
7. The apparatus for recycling resources of anaerobic fermentation broth according to claim 6, wherein the apparatus further comprises a second heat exchanger disposed on the pipe connecting the liquid outlet of the fourth chamber and the liquid inlet of the acid storage container.
8. An anaerobic fermentation liquid resource recovery device as claimed in any one of claims 1 to 3, 5 and 7, wherein a stirring component is arranged in the coagulating sedimentation mechanism.
9. The anaerobic fermentation liquid resource recovery device as claimed in any one of claims 1 to 3, 5 and 7, wherein the lower end of the coagulating sedimentation mechanism is provided with a sediment outlet which can be opened or closed.
10. The anaerobic fermentation broth resource recovery device as claimed in any one of claims 1-3, 5, 7, wherein the anaerobic fermentation broth resource recovery device further comprises at least one transfer pump, the transfer pump is arranged on one or more of the following pipelines:
a pipeline for communicating the fermentation liquor storage container with the first chamber,
A conduit communicating the first chamber and the first intermediate container,
A pipeline for communicating the first intermediate container and the coagulating sedimentation mechanism,
A pipeline for communicating the coagulating sedimentation mechanism and the second intermediate container,
A conduit communicating the second intermediate container and the third chamber,
A pipeline which is communicated with the first alkali liquor storage container and the second chamber,
A pipeline for communicating the acid liquor storage container with the fourth chamber,
A pipeline for communicating the second alkali liquor storage container with the coagulating sedimentation mechanism, and
and the pipeline is communicated with the saline solution storage container and the coagulating sedimentation mechanism.
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