NL2030935B1 - Solid-liquid separation method for biogas fluid - Google Patents
Solid-liquid separation method for biogas fluid Download PDFInfo
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- NL2030935B1 NL2030935B1 NL2030935A NL2030935A NL2030935B1 NL 2030935 B1 NL2030935 B1 NL 2030935B1 NL 2030935 A NL2030935 A NL 2030935A NL 2030935 A NL2030935 A NL 2030935A NL 2030935 B1 NL2030935 B1 NL 2030935B1
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- Prior art keywords
- biogas
- solid
- conditioner
- biogas fluid
- liquid separation
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- 239000012530 fluid Substances 0.000 title claims abstract description 84
- 239000007788 liquid Substances 0.000 title claims abstract description 64
- 238000000926 separation method Methods 0.000 title claims abstract description 53
- 239000002904 solvent Substances 0.000 claims abstract description 54
- 238000004064 recycling Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000007787 solid Substances 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000007791 liquid phase Substances 0.000 claims abstract description 6
- 239000012074 organic phase Substances 0.000 claims abstract description 6
- 239000000084 colloidal system Substances 0.000 claims abstract description 5
- 230000001603 reducing effect Effects 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical group CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 18
- 239000010806 kitchen waste Substances 0.000 claims description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- 238000004821 distillation Methods 0.000 claims description 12
- 239000010802 sludge Substances 0.000 claims description 6
- 238000000855 fermentation Methods 0.000 claims description 5
- 230000004151 fermentation Effects 0.000 claims description 5
- 238000009835 boiling Methods 0.000 claims description 4
- 239000003495 polar organic solvent Substances 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims 2
- 230000005494 condensation Effects 0.000 claims 2
- 230000018044 dehydration Effects 0.000 claims 2
- 238000006297 dehydration reaction Methods 0.000 claims 2
- 239000006228 supernatant Substances 0.000 claims 2
- 239000000701 coagulant Substances 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
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
- C02F1/26—Treatment of water, waste water, or sewage by extraction
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/046—Treatment of water, waste water, or sewage by heating by distillation or evaporation under vacuum produced by a barometric column
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
-
- 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
- C02F2209/03—Pressure
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
In a solid—liquid separation method for a biogas fluid, part of polar insoluble substances in the biogas fluid, are transferred from a solid—liquid phase to an organic phase via a conditioner to reduce a stability of the original colloidal system of the biogas fluid. Further, the conditioner is recycled effectively. The method includes the following steps of: mixing the biogas fluid with the conditioner, and performing an extraction reaction while stirring; performing the solid—liquid separation of the biogas fluid in a mechanical centrifugal way; and recycling the conditioner in centrifuged supernate and biogas residues effectively, thereby recycling the conditioner while improving a solid content of the biogas residues, and reducing SS in an effluent. Finally, the SS in the effluent is lower than 600 mg/L, a recycling rate of a solvent is more than 90%, and a Hwisture content of a mud cake is lower than 60%.
Description
P1153/NLpd
SOLID-LIQUID SEPARATION METHOD FOR BIOGAS FLUID
The present invention belongs to the technical field of envi- ronmental protection, and relates to a high-efficiency solid- liquid separation technique of a biogas fluid in a recycling of a conditioner.
Biogas fluid is an inevitable product for a fermentation of organic kitchen wastes, which carries a large quantity of patho- genic bacteria, heavy metals, and toxic organic pollutants; and in the event of failure to appropriate disposal, it will lead to a risk of severe environmental pollution. With a great impetus to a national waste collection policy, wet wastes are collected sepa- rately, but due to its easiness in decay and high water content, it is no longer possible to send them to a landfill for simple backfilling, or transport them to a waste incineration plant for incineration together with other wastes just like before. There- fore, a large quantity of wet wastes poses a severe challenge to the prevention and control of environmental pollution and the sus- tainable utilization of social resources in China, and a fermenta- tion technology is therefore widely applied in the degradation of easily perishable substances, the volume reduction of substances with high water contents, and other fields. Meanwhile, organic substances with high concentrations can also be degraded into clean biogas resources, however, suspended solids arising from the fermentation in the biogas fluid are high in content, which will aggravate processing loads at a subsequent biological section of the biogas fluid, such as membrane blockage in an MBR membrane tank, overhigh SS in an effluent, and high load of a secondary sedimentation tank. Due to a limitation to technologies, capitals, and other factors, the highly efficient solid-liquid separation of the biogas fluid from the organic kitchen wastes in China is still a weak link in the field of water pollution control. A large quan- tity of non-recyclable coagulants/flocculants added have become a primary approach for a sewage plant to condition the biogas fluid, and secondary pollutions arising therefrom not only seriously pose a threat to an environmental quality near a biogas fluid disposal plant, but also run counter to a development concept of an ecolog- ical civilization in nowadays society. Therefore, a safe, effi- cient, energy-saving and low-cost sclid-liquid separation technol- ogy of the biogas fluid is still an inevitable requirement for an improvement in the environmental quality, which has become a main- stream development trend of a water pollution control technology.
A composition of the biogas fluid in the organic kitchen wastes is extremely complex, in which an organic content generally accounts for 80 to 95 wt.% of a total solid, and an organic compo- nent is high in hydrophilicity and water binding capacity, making the biogas fluid show a colloidal floc structure, resulting in an extremely poor solid-liquid separation performance. Therefore, how to improve a solid-liquid separation efficiency of the biogas flu- id with high efficiency and low consumption is a key link to im- prove a level of the solid-liquid separation and disposal technol- ogy in China.
At present, the coagulants and the flocculants which are rep- resented by poly aluminum chloride (PAC), polyferric chloride (PFC), and polyacrylamide (PAM) are still widely applied coagu- lant/flocculant conditioners for the biogas fluid, which change surface electrical properties and a aggregation state of solid particles in the biogas fluid through electrical neutralization under an adsorption bridging effect, so that a colloidal system that is stable in the biogas fluid is destabilized, and destabi- lized colloidal particles are aggregated to lead to a coagulation of a large floc. However, after the traditional conditicner is used, mechanical centrifugation is conducted, but SS in an efflu- ent can only be reduced to 6,000 to 8,000 mg/L. Furthermore, the incineration has gradually become a development direction of a fi- nal disposal of solid wastes in China due to its significant bene- fits of minimization, stabilization, and energy regeneration, how- ever, with an addition of the poly aluminum chloride (PAC), and the polyferric chloride (PFC), a large quantity of chloride ions are introduced into sludge, which aggravates a risk of a generation of dioxin in a biogas residue incineration process, and an introduc- tion of Fe 3+ will cause a corrosion of biogas fluid treatment equipment. The above defects seriously limit sustainable promotion and application of the traditional coagulant/flocculant condition- ers in solid-liquid separation and incineration processes of the biogas fluid. In addition, in terms of the solid-liquid separation process of the biogas fluid, calcined lime, as a coagulant condi- tioner, is widely applied, however, a dose is generally up to 10 to 15 wt.% of a wet weight of the sludge. High dose, large compat- ibilization ratio, adjustment of a pH value of the biogas fluid to alkalinity, and other factors have become primary factors for the traditional coagulant conditioners to restrict a subsequent re- source utilization and a processing efficiency of the biogas flu- id. Therefore, on the premise of taking into account the highly efficient solid-liquid separation of the biogas fluid, if a recy- cling of the conditioners for the highly efficient solid-liquid separation of the biogas fluid can be achieved, it is of great significance to improve the level of the treatment and disposal technology of the biogas fluid, and also has a broad market appli- cation prospect and good social and environmental benefits.
Aiming at the above defects in the prior art, the present in- vention aims to provide a new highly efficient solid-liquid sepa- ration method for biogas fluid from organic kitchen wastes by a recyclable conditioner. The method has characteristics, such as no consumption of the conditioner for solid-liquid separation, low energy consumption in highly efficient solid-liquid separation of the biogas fluid, and simple technological process.
To fulfill the above objective, a solution of the present in- vention is as follow:
In the solid-liquid separation method for the biogas fluid, part of polar insoluble substances in the biogas fluid are trans- ferred from a solid-liquid phase to an organic phase via the con- ditioner to reduce a stability of the original colloidal system of the biogas fluid and improve a solid-liquid separation performance of sludge.
Further, the conditioner is recycled effectively.
The solid-liquid separation method for the biogas fluid in- cludes the following steps: (1) mixing the biogas fluid with the conditioner, and per- forming an extraction reaction while stirring to make part of the polar insoluble substances in the biogas fluid transferred from the solid-liquid phase to the organic phase; {2) performing the solid-liquid separation of the biogas flu- id in a mechanical centrifugal way; and (3) recycling the conditioner in centrifuged supernate and biogas residues effectively, thereby recycling the conditioner while improving a solid content of the biogas residues, and reduc- ing SS in an effluent.
Preferably, the biogas fluid is one caused by a fermentation of the organic kitchen wastes.
Preferably, a moisture content of the biogas fluid ranges from 95 to 97.5%.
Preferably, the conditioner is a polar organic solvent with a low boiling point, and more preferably, acetonitrile, and acetone.
Preferably, a mass mixing ratio of the conditioner to the sludge is 0.1 to 0.5: 1.
Preferably, in the step (1), time for extracting while stir- ring ranges from 5 to 30 min.
Preferably, in the step (2), a revolving speed of mechanical centrifugation ranges from 1,500 to 4,500 rpm, and time of cen- trifugation ranges from 1 to 15 min.
Preferably, in the step (3), the solvent is recycled from the centrifuged supernate via reduced pressure distillation at temper- ature of 40 to 80°C under a vacuum degree of 0.05 to 0.08 MPa, and a condensing temperature of solvent vapor ranges from § to 18°C.
Preferably, in the step (3), the sclvent is recycled from the biogas residues obtained by the solid-liquid separation through the reduced pressure distillation at the temperature of 40 to 80°C under the vacuum degree of 0.05 to 0.08 MPa, and the condensing temperature of the solvent vapor ranges from 10 to 20°C.
Due to the application of the scheme, the present invention has beneficial effects that
A treatment method of the present invention is simple and practicable, and free of consumption of coagulant/flocculant con- ditioners for the biogas fluid and a pretreatment process of the biogas fluid; and as large agent dose, high compatibilization ra- 5 tio of the biogas fluid, low solid-liquid separation efficiency, high energy consumption of drying, and other defects in the tradi- tional solid-liquid separation-incineration process of the biogas fluid are overcome, a risk of secondary environmental pollution arising from the large dose of the coagulant/flocculant condition- ers for the biogas fluid is reduced, the moisture content of the biogas residues and SS in an effluent are also reduced efficiently and substantially, so that the recycling rate of the solvent is more than 90%, the moisture content of a mud cake is lower than 30%, and the SS in the effluent is lower than 600 mg/L. In addi- tion, after a highly efficient solid-liquid separation process of the biogas fluid is completed, the solvent that is recovered by distillation can be recycled, and material consumption and process operating costs of the solid-liquid separation are reduced. There- fore, the treatment method of the present invention has high so- cial and environmental benefits, economic benefits, and a broad market application prospect.
FIG. 1 is a process schematic diagram illustrating a new highly efficient solid-liquid separation technology for biogas fluid from organic kitchen wastes by a recyclable conditioner, provided by embodiments.
The present invention provides a new highly efficient solid- liquid separation technique for biogas fluid from organic kitchen wastes by a recyclable conditioner, in which the biogas fluid was mixed with polar organic solvents with low boiling points, such as acetonitrile and acetone, an extraction reaction was conducted for certain time while stirring, making part of polar insoluble sub- stances in the biogas fluid transferred from a sclid-liquid phase interface to an organic phase, thereby reducing a stability of a colloidal system of the biogas fluid, and improving a solid-liquid separation performance of the biogas fluid; then, the biogas fluid was subjected to the solid-liquid separation of the biogas fluid in a mechanical centrifugal way; and the solvent in centrifuged supernate and biogas residues could be recycled effectively via reduced pressure distillation and reduced pressure evaporation, thereby recycling the solvent type conditioner for highly effi- cient solid-liquid separation of the sludge biogas fluid while im- proving a solid content of the biogas residues significantly, and reducing SS in an effluent.
The present invention will be further explained in conjunc- tion with embodiments.
Embodiment 1--Highly efficiency solid-liquid separation of the biogas fluid in a kitchen waste treatment plant in Shanghai
City (1) the biogas fluid with an initial moisture content of 97.5% was mixed with acetonitrile in a mass mixing ratio of 1: 1, and extraction was conducted for 5 min while stirring; (2) the solid-liquid separation was conducted at a revolving speed of 4,500 rpm for 1 min in the mechanical centrifugal way; (3) the solvent was recycled from the centrifuged supernate via the reduced pressure distillation at temperature of 80°C under a vacuum degree of 0.05 MPa, and a condensing temperature of sol- vent vapor was 8°C; and the solvent was recycled from the biogas residues obtained by the solid-liquid separation via the reduced pressure evaporation at the temperature of 80°C under the vacuum degree of 0.05 MPa, and the condensing temperature of the solvent vapor was 8°C. (4) Finally, the recycling rate of the solvent in the biogas residues was 87.5%, the recycling rate of the solvent in the su- pernate was 92.2%, the final moisture content of the biogas resi- dues after the solvent was recycled was 32%, and the SS in the ef- fluent was 200 mg/L.
Embodiment 2--Highly efficiency solid-liquid separation of the biogas fluid in a kitchen waste treatment plant in Shanghai
City (1) the bicgas fluid with the initial moisture content of 97.5% was mixed with the acetonitrile in a mass mixing ratio of
0.5: 1, and the extraction was conducted for 15 min while stir- ring; (2) the solid-liquid separation was conducted at the revolv- ing speed of 2,500 rpm for 10 min in the mechanical centrifugal way; {3) the solvent was recycled from the centrifuged supernate via the reduced pressure distillation at the temperature of 70°C under the vacuum degree of 0.07 MPa, and the condensing tempera- ture of the solvent vapor was 14°C; and the solvent was recycled from the biogas residues obtained by the solid-liquid separation via the reduced pressure evaporation at the temperature of 70°C under the vacuum degree of 0.07 MPa, and the condensing tempera- ture of the solvent vapor was 14°C. {4) Finally, the recycling rate of the solvent in the biogas residues was 91.3%, the recycling rate of the solvent in the su- pernate was 97.1%, the final moisture content of the biogas resi- dues after the solvent was recycled was 46%, and the SS in the ef- fluent was 400 mg/L.
Embodiment 3--Highly efficiency solid-liquid separation of the biogas fluid in a kitchen waste treatment plant in Shanghai
City {1) the biogas fluid with the initial moisture content of 95% was mixed with the acetonitrile in a mass mixing ratio of 0.1: 1, and the extraction was conducted for 30 min while stirring; {2} the solid-liquid separation was conducted at the revolv- ing speed of 1,500 rpm for 15 min in the mechanical centrifugal way; (3) the solvent was recycled from the centrifuged supernate via the reduced pressure distillation at the temperature of 80°C under the vacuum degree of 0.08 MPa, and the condensing tempera- ture of the solvent vapor was 18°C; and the solvent was recycled from the biogas residues obtained by the solid-liquid separation via the reduced pressure evaporation at the temperature of 80°C under the vacuum degree of 0.08 MPa, and the condensing tempera- ture of the solvent vapor was 18°C. (4) Finally, the recycling rate of the solvent in the biogas residues was 89.2%, the recycling rate of the solvent in the su- pernate was 101.1% (there was also a moisture evaporation during recycling, so that a total mass of the recycled solvent was higher than a mass of the added solvent), the final moisture content of the bicgas residues after the solvent was recycled was 45.7%, and the SS in the effluent was 500 mg/L.
Embodiment 4--Highly efficiency solid-liquid separation of the biogas fluid in a kitchen waste treatment plant in Shanghai
City {1) the biogas fluid with the initial moisture content of 95% was mixed with acetone in a mass mixing ratio of 1: 1, and the ex- traction was conducted for 5 min while stirring; (2) the solid-liquid separation was conducted at the revolv- ing speed of 4,500 rpm for 1 min in the mechanical centrifugal way; (3) the solvent was recycled from the centrifuged supernate via the reduced pressure distillation at the temperature of 60°C under the vacuum degree of 0.08 MPa,and the condensing temperature of the solvent vapor was 10°C; and the solvent was recycled from the biogas residues obtained by the solid-liquid separation via the reduced pressure evaporation at the temperature of 60°C under the vacuum degree of 0.08 MPa,and the condensing temperature of the solvent vapor was 10°C. (4) Finally, the recycling rate of the solvent in the biogas residues was 98.5%, the recycling rate of the solvent in the su- pernate was 92.4%, the final moisture content of the biogas resi- dues after the solvent was recycled was 55.5%, and the SS in the effluent was 400 mg/L.
Embodiment 5--Highly efficiency solid-liquid separation of the biogas fluid in a kitchen waste treatment plant in Shanghai
City (1) the biogas fluid with the initial moisture content of 97.5% was mixed with the acetone in a mass mixing ratio of 0.5: 1, and the extraction was conducted for 15 min while stirring; (2) the solid-liquid separation was conducted at the revolv- ing speed of 2,500 rpm for 8 min in the mechanical centrifugal way; (3) the solvent was recycled from the centrifuged supernate via the reduced pressure distillation at temperature of 40°C under a vacuum degree of 0.05 MPa, and a condensing temperature of sol- vent vapor was 8°C; and the solvent was recycled from the biogas residues obtained by the solid-liquid separation via the reduced pressure evaporation at the temperature of 40°C under the vacuum degree of 0.05 MPa, and the condensing temperature of the solvent vapor was 8°C. (4) Finally, the recycling rate of the solvent in the biogas residues was 95.4%, the recycling rate of the solvent in the su- pernate was 96.7%, the final moisture content of the biogas resi- dues after the solvent was recycled was 56.1%, and the SS in the effluent was 470 mg/L.
Embodiment 6--Highly efficiency solid-liquid separation of the biogas fluid in a kitchen waste treatment plant in Shanghai
City (1) the biogas fluid with the initial moisture content of 95% was mixed with the acetone in a mass mixing ratio of 0.2: 1, and the extraction was conducted for 30 min while stirring; (2) the solid-liquid separation was conducted at the revolv- ing speed of 1,500 rpm for 15 min in the mechanical centrifugal way; (3) the solvent was recycled from the centrifuged supernate via the reduced pressure distillation at the temperature of 50°C under the vacuum degree of 0.07 MPa, and the condensing tempera- ture of the solvent vapor was 17°C; and the solvent was recycled from the biogas residues obtained by the solid-liquid separation via the reduced pressure evaporation at the temperature of 50°C under the vacuum degree of 0.07 MPa, and the condensing tempera- ture of the solvent vapor was 17°C. (4) Finally, the recycling rate of the solvent in the biogas residues was 96.2%, the recycling rate of the solvent in the su- pernate was 94.7%, the final moisture content of the biogas resi- dues after the solvent was recycled was 54.6%, and the SS in the effluent was 570 mg/L.
To make an ordinary person skilled in the art understand and use the present invention, the above embodiments are described. It is apparent that a person skilled in the art could easily make any amendment to these embodiments, and apply any general principle set forth herein to other embodiments, without creative labor.
Therefore, the present invention is not limited to the embodi- ments. Any improvement and amendment made by a person skilled in the art according to the principle of the present invention, with- out departing from the scope of the present invention shall fall within the scope of protection of the present invention.
Claims (12)
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| Application Number | Priority Date | Filing Date | Title |
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| NL2030935A NL2030935B1 (en) | 2022-02-14 | 2022-02-14 | Solid-liquid separation method for biogas fluid |
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| Application Number | Priority Date | Filing Date | Title |
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| NL2030935A NL2030935B1 (en) | 2022-02-14 | 2022-02-14 | Solid-liquid separation method for biogas fluid |
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| NL2030935B1 true NL2030935B1 (en) | 2023-08-18 |
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