CN111792749B - Method for improving sewage treatment efficiency suitable for biological fermentation ethanol preparation process - Google Patents
Method for improving sewage treatment efficiency suitable for biological fermentation ethanol preparation process Download PDFInfo
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- CN111792749B CN111792749B CN202010526157.3A CN202010526157A CN111792749B CN 111792749 B CN111792749 B CN 111792749B CN 202010526157 A CN202010526157 A CN 202010526157A CN 111792749 B CN111792749 B CN 111792749B
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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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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Abstract
The invention relates to a method for improving sewage treatment efficiency suitable for a process for preparing ethanol by biological fermentation, which comprises the steps of mixing residual distilled water at a tower bottom of a distillation process, a composite flocculant and mash uniformly in sequence, and feeding the mixture into a primary centrifuge for first centrifugal concentration; the centrifugal concentrated material obtained by the primary centrifugal machine enters a homogenizing tank; and the centrifugal clear liquid obtained by the primary centrifugal machine enters a secondary centrifugal machine for centrifugal concentration again, the centrifugal clear liquid obtained by the secondary centrifugal machine enters a sewage treatment system, and the centrifugal concentrated material obtained by the secondary centrifugal machine enters a homogenizing tank. The method adopts twice centrifugal treatment, so that the thallus content of the centrifugal clear liquid flowing into the sewage treatment system is further reduced, the total suspended solid content of sewage inlet water is reduced, the sewage treatment difficulty is reduced, the sewage treatment efficiency is improved, the pressure is reduced for the sewage treatment process, the stable and efficient production is ensured, and meanwhile, the unnecessary loss of mycoprotein is reduced.
Description
Technical Field
The invention belongs to the technical field of bioengineering, and particularly relates to a method for improving sewage treatment efficiency in a process for preparing ethanol by biological fermentation.
Background
The fuel ethanol belongs to biomass energy, is a strategic emerging industry of national key development, forecasts that the demand of the domestic fuel ethanol market reaches more than 1500 million tons in 2020 according to the total consumption of gasoline in China, and the current fuel ethanol yield of China is only about 300 million tons. The fuel ethanol has combustion performance similar to that of gasoline, can be completely combusted, and does not generate harmful substances to human bodies. The application of the fuel ethanol can reduce the dependence of the country on crude oil import, in addition, the use of the fuel ethanol can effectively reduce the carbon emission and the particulate matter emission of automobile exhaust, the air quality is improved, and the popularization of the fuel ethanol is an effective measure for reducing the emission of greenhouse gases and treating haze weather.
The method for producing fuel ethanol by industrial gas biological fermentation is a new high-tech production process, and introduces a biological fermentation technology to directly convert tail gas in the steel industry into clean energy, chemical products and protein feed, so that the high-efficiency clean utilization of industrial tail gas resources is realized, and green low-carbon, circular economy and sustainable development are practiced. The process takes converter gas of a steel plant as a heat source, adopts a biological fermentation method, and produces fuel ethanol through the process flows of pretreatment, fermentation, distillation, dehydration and the like, wherein the residual water generated by distillation in a tower bottom is rich in mycoprotein, and after centrifugal separation, clear liquid is pumped into a sewage treatment process through a pump for sewage treatment.
At present, after residual distilled water in a distillation process tower enters a protein process and is concentrated for one time by a disc centrifuge, the thallus content of a centrifuged clear liquid is higher, so that the TSS (total suspended solids) of sewage inlet water is higher; the TSS value of the inflow water is strictly required by the sewage treatment process, and unnecessary loss of anaerobic sludge in the anaerobic reactor is caused due to the higher TSS value, so that the sewage treatment efficiency is low, the production load of the sewage treatment process is increased, the smooth production is seriously affected, and the method is not suitable for large-scale industrial production.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a method for improving the efficiency of sewage treatment in a bio-fermentation ethanol production process, which overcomes or at least partially solves the above problems, and the method further reduces the cell content of the supernatant fluid flowing into the sewage treatment system by two times of centrifugation, thereby reducing the total suspended solids content of the sewage inlet water, reducing the difficulty of sewage treatment, improving the efficiency of sewage treatment, relieving the pressure of the sewage treatment process, ensuring stable and efficient production, and reducing unnecessary loss of mycoprotein.
In order to achieve the purpose, the invention provides a method for improving sewage treatment efficiency suitable for a process for preparing ethanol by biological fermentation, which is characterized in that the method comprises the following steps of carrying out two-stage centrifugal separation on the residual distilled water in a tower kettle of a distillation working procedure by a first-stage centrifugal machine and a second-stage centrifugal machine to obtain clear liquid, and conveying the clear liquid to a sewage treatment system by a pump for sewage treatment, wherein the method comprises the following steps: mixing the residual distilled water from the tower bottom of the distillation process with the composite flocculant and the mash in sequence, uniformly mixing the mixture, and feeding the mixture into a primary centrifuge for primary centrifugal concentration; the centrifugal concentrated material obtained by the primary centrifugal machine enters a homogenizing tank; and the centrifugal clear liquid obtained by the primary centrifugal machine enters a secondary centrifugal machine for centrifugal concentration again, the centrifugal clear liquid obtained by the secondary centrifugal machine enters a sewage treatment system, and the centrifugal concentrated material obtained by the secondary centrifugal machine enters a homogenizing tank.
Further, the primary centrifuge is a horizontal screw centrifuge, and the secondary centrifuge is a disc centrifuge.
Further, the distillation process tower bottom residual water refers to residual water obtained after alcohol is collected by distilling the fermentation clear liquid without thalli in the process of producing fuel ethanol by fermenting industrial gas.
Further, the mash is mash obtained by distilling a fermentation liquor containing thalli in the process of producing fuel ethanol by fermenting industrial gas and collecting alcohol.
Further, the centrifugal concentrated material obtained by the horizontal screw centrifuge and the centrifugal concentrated material obtained by the disc centrifuge enter a homogenizing tank to prepare clostridium ethanolate protein powder.
Further, the residual distilled water in the distillation process tower bottom exchanges heat through a heat exchanger and then is mixed with the composite flocculant and the mash.
Further, the composite flocculant is put into a flocculant preparation tank.
Further, the mash is put into a flocculation stirring tank.
Compared with the prior art, the method for improving the sewage treatment efficiency by the process for preparing ethanol by biological fermentation has the following advantages: the centrifugal process is improved, the first-stage centrifugal separation is added, distilled residual water is conveyed to a sewage treatment system through a pump after the second-stage centrifugal separation, and the solid content of the thalli of the centrifugal clear liquid discharged into a sewage treatment process through the pump can be effectively reduced. Due to the reduction of the solid content of the centrifugal clear liquid, the TSS (total suspended solid) value of the sewage inlet water is reduced, so that the production load of the sewage treatment process is reduced, the production efficiency of the sewage treatment process is improved, and the stable and efficient production smoothness of the sewage treatment process is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are the embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of the method for improving sewage treatment efficiency in a process for preparing ethanol by biological fermentation.
Detailed Description
The present invention will be specifically explained below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly presented thereby. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, 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. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
referring to fig. 1, the present application provides a method for improving sewage treatment efficiency in a process for preparing ethanol by biological fermentation, the method comprising: the method comprises the following steps of performing heat exchange on residual distilled water in a tower kettle in a distillation process, preparing composite flocculant mother liquor, mixing the composite flocculant mother liquor and mash to flocculate, allowing the uniformly mixed flocculated mash to enter a horizontal screw centrifuge for primary centrifugal separation, allowing the supernatant obtained by centrifuging the supernatant in the horizontal screw centrifuge to enter a disc centrifuge for secondary centrifugal separation, pumping the supernatant obtained by centrifuging the disc centrifuge into a sewage treatment process for sewage treatment, allowing the concentrated material obtained by centrifuging the horizontal screw centrifuge and the concentrated material obtained by centrifuging the disc centrifuge to enter a homogenizing tank for uniform mixing, and preparing clostridium ethanolate protein powder.
The two-stage centrifugal separation process is not only suitable for improving the subsequent sewage treatment efficiency of the clostridium ethanolate protein preparation, but also suitable for the preparation process of other mycoprotein except the clostridium ethanolate protein.
The method comprises the following specific steps:
(1) And (3) exchanging heat of the residual distilled water of the distillation tower kettle through a heat exchanger, pumping the residual distilled water into a flocculant preparation tank for preparing composite flocculant mother liquor: uniformly adding a composite flocculant in a flocculant preparation tank, starting the flocculant preparation tank to stir until the composite flocculant is completely dissolved, and uniformly mixing;
(2) Conveying the uniformly mixed mother liquor of the composite flocculant into a flocculation stirring tank, and injecting mash (the mash contains mycoprotein) into the flocculation stirring tank to flocculate the mycoprotein; after the flocculation stirring tank is uniformly stirred, stopping stirring and entering the next procedure;
(3) The mash which is uniformly flocculated and mixed enters a horizontal screw centrifuge for the first centrifugal concentration;
(4) Centrifuging the concentrated material by a horizontal screw centrifuge and feeding the concentrated material into a homogenizing tank;
(5) Centrifuging the clear liquid in a horizontal screw centrifuge, and performing secondary centrifugal concentration in a disc centrifuge;
(6) The centrifugal clear liquid of the disc centrifuge is pumped into a sewage treatment system by a pump for sewage treatment.
(7) And (3) enabling the concentrated centrifugal material of the disc centrifuge to enter a homogenizing tank and uniformly mixing with the concentrated centrifugal material of a horizontal screw centrifuge to prepare the clostridium ethanolate protein powder.
The present application is described in more detail by way of examples below. These examples are intended to describe the best mode of carrying out the invention and are not intended to limit the scope of the invention in any way, since they are intended to be orthogonal tests on the conditions of still water and multi-factor multi-level conditions such as feed rate, impeller, screw, rotational speed, and reject time of a two-stage centrifuge.
The detection results of the process part are as follows:
before the addition of the horizontal screw centrifuge, the single-stage centrifugation effect of the disc centrifuge is detected, and partial experimental results are shown as follows:
TABLE 1 Single stage centrifuge Effect test partial results
A horizontal screw centrifuge is added to carry out centrifugal effect detection on the sampled clear liquid after two-stage centrifugation, and partial experimental results are as follows:
TABLE 2 partial results of two-stage centrifugal effect test
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages: exchanging heat of residual distilled water, preparing mother liquor of the composite flocculant, mixing and flocculating the mother liquor of the composite flocculant and mash, allowing the uniformly mixed flocculated mash to enter a horizontal screw centrifuge for primary centrifugal separation, allowing supernatant obtained by centrifuging the horizontal screw centrifuge to enter a disc centrifuge for secondary centrifugal separation, pumping the supernatant obtained by centrifuging the disc centrifuge into a sewage treatment system for sewage treatment, and allowing two-stage concentrated materials to enter a homogenizing tank to prepare clostridium ethanolate protein powder; the residual distilled water in the distillation tower kettle can effectively reduce the thallus content, reduce the TSS value of sewage inlet, improve the sewage treatment efficiency, reduce the pressure of a sewage treatment process and increase the protein yield through twice centrifugal concentration; the novel method for performing two-stage centrifugal concentration on the distilled residual water by using the two centrifuges can effectively improve the sewage treatment efficiency, improve the sewage treatment capacity in unit time, increase the protein yield, ensure the smooth production and be beneficial to large-scale industrial production.
Finally, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. A method for improving sewage treatment efficiency suitable for a process for preparing ethanol by biological fermentation is characterized in that distilled water from a tower kettle in a distillation process is subjected to two-stage centrifugal separation by a first-stage centrifugal machine and a second-stage centrifugal machine to obtain clear liquid, and the clear liquid is conveyed to a sewage treatment system by a pump for sewage treatment, and the method is characterized in that: mixing the residual distilled water from the tower bottom of the distillation process with the composite flocculant and the mash in sequence, uniformly mixing the mixture, and feeding the mixture into a primary centrifuge for primary centrifugal concentration; the centrifugal concentrated material obtained by the primary centrifugal machine enters a homogenizing tank; the centrifugal clear liquid obtained by the first-stage centrifugal machine enters a second-stage centrifugal machine for centrifugal concentration again, the centrifugal clear liquid obtained by the second-stage centrifugal machine enters a sewage treatment system, and the centrifugal concentrated material obtained by the second-stage centrifugal machine enters a homogenizing tank;
the primary centrifugal machine is a horizontal screw centrifugal machine, and the secondary centrifugal machine is a disc centrifugal machine;
the distillation process tower bottom residual water refers to residual water obtained after alcohol is collected by distilling the fermentation clear liquid without thalli in the process of producing fuel ethanol by fermenting industrial gas;
the mash is the mash obtained by distilling a fermentation liquor containing thalli in the process of producing fuel ethanol by fermenting industrial gas and collecting alcohol;
and the centrifugal concentrated material obtained by the horizontal screw centrifuge and the centrifugal concentrated material obtained by the disc centrifuge enter a homogenizing tank to prepare clostridium ethanolate protein powder.
2. The method for improving the sewage treatment efficiency in the process of preparing ethanol by biological fermentation according to claim 1, which is characterized in that: and the distillation process tower still residual distilled water exchanges heat through a heat exchanger and then is mixed with the composite flocculant and the mash.
3. The method for improving the sewage treatment efficiency in the process of preparing ethanol by biological fermentation according to claim 1, which is characterized in that: and putting the composite flocculant into a flocculant preparation tank.
4. The method for improving the sewage treatment efficiency in the process of preparing ethanol by biological fermentation according to claim 1, which is characterized in that: and the mash is put into a flocculation stirring tank.
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Citations (3)
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|---|---|---|---|---|
| US5145256A (en) * | 1990-04-30 | 1992-09-08 | Environmental Equipment Corporation | Apparatus for treating effluents |
| KR101802459B1 (en) * | 2016-08-08 | 2017-11-28 | 한국수자원공사 | The purification method of phycocyanin and microcystins from blue green algae |
| CN110078241A (en) * | 2019-05-29 | 2019-08-02 | 美景（北京）环保科技有限公司 | The processing system and method for biogas slurry after a kind of vinasse anaerobic fermentation |
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| CN1135462A (en) * | 1995-12-26 | 1996-11-13 | 砀山县化学工业研究所 | Method for separating suspension from waste liquid in production of acetone and butanol by fermentation method and apparatus thereof |
| CN103100260B (en) * | 2011-11-10 | 2015-02-04 | 华东理工大学 | Efficient method for separating solid residue and product in lignocellulose fermented mash |
| CN105417844A (en) * | 2015-11-12 | 2016-03-23 | 北京首钢朗泽新能源科技有限公司 | Fermentation wastewater processing method and biological feed |
| CN106755128A (en) * | 2016-12-02 | 2017-05-31 | 江南大学 | A kind of reuse of anaerobic digestion solution part as Alcohol Production spice water method |
| CN110526469A (en) * | 2019-09-10 | 2019-12-03 | 河北首朗新能源科技有限公司 | A kind of processing of fermentation waste water and mycoprotein recovery process and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5145256A (en) * | 1990-04-30 | 1992-09-08 | Environmental Equipment Corporation | Apparatus for treating effluents |
| KR101802459B1 (en) * | 2016-08-08 | 2017-11-28 | 한국수자원공사 | The purification method of phycocyanin and microcystins from blue green algae |
| CN110078241A (en) * | 2019-05-29 | 2019-08-02 | 美景（北京）环保科技有限公司 | The processing system and method for biogas slurry after a kind of vinasse anaerobic fermentation |
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