CN106746224A - The processing system and its method of cellulosic ethanol production waste water - Google Patents
The processing system and its method of cellulosic ethanol production waste water Download PDFInfo
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- CN106746224A CN106746224A CN201611229215.6A CN201611229215A CN106746224A CN 106746224 A CN106746224 A CN 106746224A CN 201611229215 A CN201611229215 A CN 201611229215A CN 106746224 A CN106746224 A CN 106746224A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
This application provides a kind of processing system and its method of cellulosic ethanol production waste water, the system includes：For the biochemical treatment apparatus of biochemical treatment cellulosic ethanol production waste water；The clear water collecting pit that import is connected with the biochemical treatment apparatus delivery port；The acid out unit that import is connected with the clear water collecting pit delivery port；The first coagulation unit being connected with the acid out unit delivery port；The first precipitation unit that import is connected with the first coagulation unit, first precipitation unit has delivery port.After the application cellulosic ethanol plant effluent is processed through biochemical treatment apparatus, clear water reserviors are collected in.The application mainly utilizes acid out technical finesse cellulosic ethanol waste water, the lignin in the waste water is converted into suspension by solubilised state in acid condition and separates out, then by coagulation, precipitation, suspension is effectively removed, and realizes the purpose of removing lignin.The application can obviously reduce the COD of waste water simultaneously, and treatment effect is preferable.
Description
Technical field
The application is related to technical field of waste water processing, more particularly to a kind of cellulosic ethanol production waste water processing system and
Its method.
Background technology
Cellulosic ethanol technology belongs to emerging field, is a kind of high-end clean energy technology, is with lignocellulosic etc.
Raw material produces fibre fuel ethanol using biochemical routes.In the last few years, countries in the world input substantial contribution, in each process procedure
Remarkable result is achieved, the commercialized process of cellulosic ethanol is advanced.With progressively implementing for every policy, China's fiber
The construction of plain ethanol device is also accelerating.In conventional and ongoing research, a large amount of notices have all been placed on reduction fiber
On Cost Problems caused by the material consumptions such as the strain of plain enzyme cost and raising ethanol yield, discharge of wastewater is this kind of in large-scale production
When be just able to fully to manifest that engineering problem is then paid close attention to is less.While key technology breaks through, the place of its waste water for producing
The problem of reason and resource also can be protruded increasingly, therefore, inquiring into suitable wastewater processing technology has very important meaning
Justice.
Before 50,000 tons/year of cellulosic ethanol Industrial demonstration engineering constructions of some enterprises such as China Oil and Food Import and Export Corporation, such issues that be difficult to obtain
Practical scheme is obtained, or even is difficult to recognize the place of key issue.It is smoothed out to ensure that cellulosic ethanol is commercialized, must
The wastewater problem that production cellulosic ethanol is produced must be resolved.
Cellulosic ethanol production waste water characteristic includes：Cellulosic material wide variety, it is useless that different pretreatments method is obtained
Water composition is complicated.Cellulose pretreatment destroys the natural structure of lignocellulosic, inevitably there occurs that the pair of many is anti-
Should, generate the accessory substances such as some classes containing furan nucleus, furfural, formic acid.These accessory substances without exception enter into waste water
In, these materials are generally difficult to biodegradable in a short time so that the biodegradability reduction of waste water.To cellulosic ethanol production
After waste water carries out biochemical treatment, bio-chemical effluent still has COD higher, and treatment effect is very poor.
The content of the invention
In view of this, the application provides a kind of processing system and its method of cellulosic ethanol production waste water, using this Shen
The processing system treatment cellulosic ethanol production waste water that please be provided, water outlet COD is relatively low, high treating effect.
The application provides a kind of processing system of cellulosic ethanol production waste water, including：
For the biochemical treatment apparatus of biochemical treatment cellulosic ethanol production waste water；
The clear water collecting pit that import is connected with the biochemical treatment apparatus delivery port；
The acid out unit that import is connected with the clear water collecting pit delivery port；
The first coagulation unit being connected with the acid out unit delivery port；
The first precipitation unit that import is connected with the first coagulation unit, first precipitation unit has water outlet
Mouthful.
Preferably, the acid out unit, the first coagulation unit and the first precipitation unit form the first order coagulation of integration
Stillpot；In the first order coagulating sedimentation groove cell body, acid out unit, the first coagulation unit and the first precipitation unit mutually it
Between have cut-off, and interconnected by hole.
Preferably, in the first order coagulating sedimentation groove, acid out unit bottom is provided with pump, and top is provided with top cover.
Preferably, the processing system also includes：
The dashpot that import is connected with the first precipitation unit delivery port；
The electrolytic cell that import is connected with the dashpot delivery port, the electrolytic cell has delivery port.
Preferably, the processing system also includes：
The second level coagulating sedimentation groove that import is connected with the electrolytic cell delivery port.
Preferably, the second level coagulating sedimentation groove includes：
The neutralisation unit that import is connected with the electrolytic cell delivery port；
The second coagulation unit being connected with the neutralisation unit delivery port；
The second precipitation unit that import is connected with the second coagulation unit, second precipitation unit has water outlet
Mouthful；
In the second level coagulating sedimentation groove cell body, neutralisation unit, the second coagulation unit and the second precipitation unit are mutual
Between have cut-off, and interconnected by hole.
The application also provides a kind of processing method of cellulosic ethanol production waste water, comprises the following steps：
Cellulosic ethanol production waste water is carried out into biochemical treatment, bio-chemical effluent is obtained；
Acid out is carried out after the bio-chemical effluent is collected, then through coagulation, precipitation, obtains water outlet.
Preferably, the pH value of the acid out is below 3；The acid out is under conditions of coagulant and/or flocculation aid are present
Carry out.
Preferably, also include：
Electrocatalytic oxidation will be carried out after the water outlet of coagulation, precipitation is buffered, aoxidized-it is electrolysed water outlet.
Preferably, also include：
The oxidation-electrolysis water outlet is neutralized successively, coagulation and precipitation, obtain final outflow water.
Compared with prior art, the cellulosic ethanol production Waste Water Treatment that the application is provided mainly includes：At biochemistry
Reason device, clear water collecting pit, acid out unit, coagulation unit and precipitation unit.In this application, cellulosic ethanol plant effluent warp
After biochemical treatment apparatus treatment, clear water collecting pit is collected in.The application mainly utilizes acid out technology advanced treating cellulosic ethanol
Waste water, its acid out process is in acid condition, the lignin in the waste water is converted into suspension by solubilised state and separate out, then pass through
Coagulation, precipitation are crossed, suspension is effectively removed, so as to realize removing the purpose of lignin.Meanwhile, the application can remove part
COD, hence it is evident that reduce the COD of waste water, reach preferable treatment effect.Practice have shown that, influent COD is 58320mg/L, ammonia-nitrogen content
It is 2556.7mg/L, the COD of the acid out water outlet after the application treatment is 1600~1800mg/L.
Further, the COD of the embodiment of the present application final outflow water can be 230~250mg/L, and water quality clarification, colourity are shallow.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
The structural representation of the cellulosic ethanol production Waste Water Treatment that Fig. 1 is provided for the embodiment of the present application；
The design sketch of the main water treatment stage that Fig. 2 is provided for the embodiment of the present application.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
This application provides a kind of processing system of cellulosic ethanol production waste water, including：
For the biochemical treatment apparatus of biochemical treatment cellulosic ethanol production waste water；
The clear water collecting pit that import is connected with the biochemical treatment apparatus delivery port；
The acid out unit that import is connected with the clear water collecting pit delivery port；
The first coagulation unit being connected with the acid out unit delivery port；
The first precipitation unit that import is connected with the first coagulation unit, first precipitation unit has water outlet
Mouthful.
The water treatment system provided using the application, can effectively reduce COD of cellulosic ethanol production waste water etc., at waste water
Reason effect is good, and beneficial to promoting, cellulosic ethanol is commercialized to be smoothed out.
Referring to Fig. 1, the structural representation of the cellulosic ethanol production Waste Water Treatment that Fig. 1 is provided for the embodiment of the present application
Figure.In Fig. 1,1 is clear water collecting pit, and 2 is first order coagulating sedimentation groove, and 2A is acid out unit, and 2B is the first coagulation unit, and 2C is
First precipitation unit, 3 is dashpot, and 4 is electrolytic cell, and 5 is second level coagulating sedimentation groove, and 5A is neutralisation unit, and 5B is second mixed
Solidifying unit, 5C is the second precipitation unit；Biochemical treatment apparatus are not shown in FIG. 1.
The cellulosic ethanol production Waste Water Treatment that the application is provided includes biochemical treatment apparatus, for cellulose second
Alcohol production waste water carries out biochemical treatment.In water treatment field, biochemical treatment method abbreviation biochemical process, is to utilize natural environment
In microorganism, and by the biological chemistry action in microbial body come the organic matter in Decomposition Wastewater and some inorganic toxic materials
(such as cyanide, sulfide), is allowed to be converted into stabilization, a kind of method for treating water of innocuous substance, and belonging to biochemical treatment process has work
Property sludge, biofiltration process, biomembrance process and anaerobic biological process etc..It is different according to microbial metabolism form, at wastewater biochemical
Reason can be divided into aerobic method and the major class of anaerobic process two.
In this application, the biochemical treatment apparatus have water inlet and delivery port.The application is filled to the biochemical treatment
Structure put etc. is not particularly limited, using anaerobic unit commonly used in the art, aerobic unit.In embodiments herein
In, the biochemical treatment apparatus include the anaerobic unit and the aerobic unit that are sequentially communicated；The two units can be independently arranged,
Can be with integrated setting.In some embodiments of the present application, cellulosic ethanol plant effluent is by the biochemical treatment apparatus
After treatment, its COD can be reduced to 2600~2700mg/L by 55000~60000mg/L；Ammonia-nitrogen content can by 2000~
3000mg/L is reduced to 80mg/L or so.
In water treatment field, COD (COD or CODcr) refer to the reduction in water under conditions of necessarily strictly
Property material in the presence of additional strong oxidizer, be oxidized when decomposing and consume the quantity of oxidant, represented with the mg/L of oxygen.
COD reflects the degree polluted by reducing substances in water, and these materials include organic matter, nitrite, ferrous iron
The quantity of inorganic reduction material is relatively little in salt, sulfide etc., but general water and waste water, and is very general by Organic Pollution
Time, therefore, COD can be used as organic substance relative amount composite target.
Processing system described in the embodiment of the present application includes clear water collecting pit 1, with import and delivery port.The clear water is collected
Pond can abbreviation clear water reserviors, its import is connected with the biochemical treatment apparatus delivery port, for collecting by biochemical treatment apparatus
Bio-chemical effluent after treatment, to carry out subsequent treatment.The embodiment of the present application can be connected by pipeline and realize " being connected ", its
Setting form, position etc. are using the conventional design in this area.The application is to structure of the clear water collecting pit etc. without spy
Different limitation；Can such as be collected for clear water using open square plastic charging basket.In the specific embodiment of the application, clear water reserviors are
The open square plastic charging basket of (each one meter of length, width and height), volume is 1m3；Go deep into along the water inlet for there are a hanging PVC materials on square bucket
About 0.2 meter of clear water reserviors, water flow velocity can be 40L/h.
Processing system described in the embodiment of the present application includes acid out unit 2A, with import and delivery port.The acid out unit
Import is connected with clear water collecting pit delivery port；The embodiment of the present application can be by measuring pump, by the bio-chemical effluent pumping after collection
Acid out is carried out to acid out unit.Cellulosic ethanol production waste water is by after biochemical treatment apparatus, still containing a large amount of lignin.It is wooden
Element is to contain oxo phenylpropanol or derivatives thereof structure list in a kind of unbodied, molecular structure being widely present in plant
The armaticity high polymer of unit, simple biochemical treatment is difficult to effectively removal.In acid out unit of the present invention, acid out process can make
Lignin in cellulosic ethanol biochemical waste water is converted into suspension and separates out in acid condition, by solubilised state, so that after being beneficial to
Continuous effectively removing lignin.Also, acid out can effectively improve treatment effect beneficial to removing part COD etc..
In the embodiment of the present application, the acid out unit is acidproof structure；The condition of acid out need to keep pH value below 3,
Can be using regulating system pH value such as sulfuric acid, hydrochloric acid, nitric acid.In the preferred embodiment of the application, the pH value of the acid out can
It is 3.The application is preferably separated out lignin etc. using sulfuric acid, and treatment effect is best.In this application, the acid out is preferably mixed
Solidifying agent and/or flocculation aid are carried out under conditions of existing, i.e. dosing coagulant and/or flocculation aid, and suspension can be made further to settle,
Clarify water quality.Wherein, the coagulant includes but is not limited to ferrous sulfate, aluminium polychloride (PAC) etc..The embodiment of the present application
It is preferred that with ferrous sulfate as flocculant (i.e. coagulant), ferrous sulfate can not only have good flocculating effect, and can decolourize, also
With functions such as heavy-metal ion removal, dephosphorization, sterilizations, price is also cheap.The embodiment of the present application can use polyacrylamide
(PAM) as flocculation aid, using corresponding commercially available prod.
The embodiment of the present application can be to acid out unit acid adding and coagulant；The acid out unit bottom is preferably provided with pump, can
Material is added on bottom with using a peristaltic pump.In embodiments herein, the acid out unit top is provided with top cover,
For collecting foam.
Processing system described in the embodiment of the present application includes the first coagulation unit 2B, and it is connected with acid out unit 2A delivery ports
It is logical.The processing system may include the first precipitation unit 2C, with import, delivery port and sewage draining exit.First precipitation unit
Import is connected with the first coagulation unit, and separation of solid and liquid is made by gravitational settling, and acid out water outlet is obtained via delivery port.The application
Embodiment can add the flocculation aids such as PAM to the first coagulation unit, such as be added by peristaltic pump.In this application, institute
The mixture of acid out unit output is stated by coagulation, precipitation, oil removal etc. can be effectively removed, so as to realize removing lignin, drop
The purposes such as low COD.
In the preferred embodiment of the application, the acid out unit 2A, the first coagulation unit 2B and the first precipitation unit 2C
The first order coagulating sedimentation groove 2 of integration is formed, with saving floor space, the advantages such as treatment effect, reduces cost is improved.Institute
State first order coagulating sedimentation groove and can be described as 1 grade of coagulating sedimentation groove；Acid out unit therein is also referred to as acid out area (domain), 2A areas (domain),
Coagulation unit, precipitation unit statement can be by that analogy.In first order coagulating sedimentation groove cell body described in the embodiment of the present application, acid
Analysis unit, the first coagulation unit and the first precipitation unit have cut-off each other, and are interconnected by hole, and water outlet is heavy from first
The delivery port discharge of shallow lake unit 2C.In some embodiments of the present application, the first order coagulating sedimentation groove has acid out, mixes
Solidifying, precipitation integral structure；Wherein, acid out unit bottom is provided with pump, and top is provided with top cover.
In the embodiment of the present application, the processing system preferably also includes：Import and the first precipitation unit delivery port
The dashpot 3 being connected；The electrolytic cell 4 that import is connected with the dashpot delivery port, the electrolytic cell has delivery port.
The embodiment of the present application is using the water outlet after dashpot buffering acid out etc. reason, implementation, behaviour so as to subsequent baths
Make.In embodiments herein, the dashpot import is connected with the first precipitation unit delivery port, dashpot delivery port with
Electrolytic cell import is connected.The application sets groove elevator pump preferably at the top of the dashpot, with the electrolytic cell after getting a promotion
Water inlet.
In the embodiment of the present application, electrolytic cell water inlet carries out electrocatalytic oxidation in a cell, via electrolytic cell delivery port,
Aoxidized-it is electrolysed water outlet.Wherein, oxidation is generally Fenton oxidation technology, is changed with Fenton reagent (Fenton reagent)
Learn the method for wastewater treatment of oxidation.Fenton reagent is by H2O2And Fe2+A kind of very strong oxidation of oxidability for mixing
Agent, its oxidation mechanism is mainly (general pH ＜ 3.5) in acid condition, using Fe2+As H2O2Catalyst, generation has
Very Strong oxdiative electrically and reactivity OH very high, hydroxyl radical free radical in aqueous with hardly degraded organic substance generation it is organic from
Structure is allowed to by base to destroy, final oxidation Decomposition.While Fe2+It is oxidized to Fe3+Coagulating sedimentation is produced, large amount of organic is coagulated
Tie and remove.Fenton oxidation method can effectively process the organic matters such as nitrobenzene-containing, ABS waste water and the decolouring for waste water,
Except stench.
In the embodiment of the present application, the electrocatalytic oxidation is also known as " light electrolysis " reaction system, mainly in low-voltage direct shape
It is electrolysed under state.The fillers such as built-in conductor, insulator can play a part of retain pollutant, while can additional power source effect under,
Numerous trickle electrolytic cell is formed in reactive tank, electrolysis produces hydroxyl radical free radical isoreactivity group to carry out oxidation Decomposition pollutant,
According to the difference of filler, pollutant removal mechanism has difference.Micro electrolysis tech is sent out based on iron reduction, iron carbon galvanic principles
Bright, replace galvanic cell with external power, iron loss is replaced with power consumption, its dominant mechanism for being used for sewage disposal is to be electrolysed, aoxidize also
Former and electrocoagulation.Except reducing COD, moreover it is possible to reduce colourity, it is demulsified, improves wastewater biodegradability.So can be used for high concentration
The pretreatment of sewage, or for sewage of low concentration advanced treating.In practice, light electrolysis use polar-plate-type mostly, i.e.,
Active carbon particle and dielectric mixed fillers are filled between battery lead plate；Short with the residence time, power consumption is low, applied widely,
The advantages of flexible and convenient operation.
The application is not particularly limited to dashpot, concrete structure of electrolytic cell etc.；The embodiment of the present application is mended in electrolytic cell
Hydrogen peroxide and ferrous sulfate are filled, control voltage carries out electrocatalytic oxidation.The electrolytic cell can be described as catalysis oxidation-micro-electrolysis reaction
Groove or Fenton oxidation-light electrolysis one reactive tank, are processed mainly for acid out water outlet (pH≤3)；It has delivery port, energy
Aoxidized-it is electrolysed water outlet.
In the embodiment of the present application, the processing system preferably also includes：Import is connected with the electrolytic cell delivery port
Second level coagulating sedimentation groove 5.The second level coagulating sedimentation groove can be described as 2 grades of coagulating sedimentation grooves, and its import goes out with electrolytic cell
The mouth of a river is connected, and can carry out further coagulation, precipitation to electrolytic cell water outlet, obtains final outflow water.The application is to the second level
Coagulating sedimentation groove is not particularly limited, can be using the conventional coagulative precipitation tank in this area.
In the preferred embodiment of the application, the second level coagulating sedimentation groove includes：Import and the electrolytic cell water outlet
The neutralisation unit 5A that mouth is connected；The second coagulation unit 5B being connected with the neutralisation unit delivery port；Import and described
The second precipitation unit 5C that two coagulation units are connected, second precipitation unit has delivery port；In the second level coagulation
In stillpot cell body, neutralisation unit, the second coagulation unit and the second precipitation unit have cut-off each other, and are mutually connected by hole
It is logical.Additionally, the second coagulation unit can be connected by air compressor machine etc. with the first coagulation unit.
In embodiments of the present invention, after micro-electrolysis reaction, water outlet pH value need to add basic species still in 4-5 or so
Matter such as calcium oxide, calcium hydroxide etc. carry out neutralization coagulation.In the preferred embodiment of the application, the neutralization coagulation need to adjust pH=
More than 10.5, while add PAM, can effective coagulant precipitation, final outflow water is obtained by precipitation unit.The embodiment of the present application is passed through
After crossing current coagulation, precipitation, water outlet COD is about 250mg/L, the micro- Huang of colourity.
Correspondingly, present invention also provides a kind of processing method of cellulosic ethanol production waste water, including：
Cellulosic ethanol production waste water is carried out into biochemical treatment, bio-chemical effluent is obtained；
Acid out is carried out after the bio-chemical effluent is collected, then through coagulation, precipitation, obtains water outlet.
The method for treating water that the application is provided can effectively reduce COD of cellulosic ethanol production waste water etc., wastewater treatment effect
It is really good.
The application, mainly for the waste water produced by production cellulosic ethanol, is that raw water is processed with it.According to fiber
The characteristics of plain ethanol production wastewater, in embodiments herein, the COD of the waste water can be 55000~60000mg/L；Ammonia
Nitrogen content can be 2000~3000mg/L.
Cellulosic ethanol production waste water is first carried out biochemical treatment by the embodiment of the present application, obtains bio-chemical effluent.In the application
Embodiment in, by after the biochemical treatment such as the conventional anaerobism in this area, aerobic, the COD of the bio-chemical effluent can for 2600~
2700mg/L；Ammonia-nitrogen content can be in 80mg/L or so.
Plant effluent after biochemical treatment apparatus are processed can be collected in clear water reserviors by the embodiment of the present application, by metering
Pump is pumped to acid out unit, carries out acid out, to remove lignin, COD etc..
In the embodiment of the present application, the acid out unit is acidproof structure；The condition of acid out need to keep pH value below 3,
Can be using regulating system pH value such as sulfuric acid, hydrochloric acid, nitric acid.In the preferred embodiment of the application, the pH value of the acid out can
It is 3.The application is preferably separated out lignin etc. using sulfuric acid, and the mass concentration of sulfuric acid can be 20%, with preferably treatment effect
Really.In embodiments herein, the consumption of the concentrated sulfuric acid used by acid out can be 3.5L/ tons of water.
In this application, the acid out is preferably carried out under conditions of coagulant and/or flocculation aid are present, that is, add coagulation
Agent and/or flocculation aid, can be such that suspension further settles, and clarify water quality.Wherein, the coagulant includes but is not limited to sulfuric acid
Ferrous iron, aluminium polychloride (PAC) etc..The embodiment of the present application (i.e. coagulant), ferrous sulfate preferably with ferrous sulfate as flocculant
There can not only be good flocculating effect, and can decolourize, also with the functions such as heavy-metal ion removal, dephosphorization, sterilization, price
Cheaply.The embodiment of the present application can be using polyacrylamide (PAM) as flocculation aid, using commercially available prod.
The embodiment of the present application can carry out acid out coagulation to acid out unit acid adding and coagulant, and the residence time is preferably 10min
~30min, more preferably 15min~25min.In some preferred embodiments of the application, 20% matter is added in acid out unit
Amount concentration sulphuric acid and ferrous sulfate, proportioning are preferably 1400mL/ hours：15~20g/ hours.
Then, the embodiment of the present application can add flocculation aid to coagulation unit, then through precipitation, obtain acid out water outlet.In this Shen
In some preferred embodiments please, the PAM of 3~4ppm is added in coagulation unit, (PAM is made into 1/ to as 105~140mg/H
1000, i.e. 105-140ml/H, peristaltic pump are added)；Residence time is preferably 10min~30min, and more preferably 15min~
25min.The embodiment of the present application can be 30min~60min, preferably 40min~50min in the residence time of precipitation unit.
After obtaining acid out water outlet, the application preferably also includes：By by carrying out electro-catalysis after coagulation, the water outlet buffering of precipitation
Oxidation, aoxidized-it is electrolysed water outlet.
The embodiment of the present application can be by acid out effluent collection in dashpot, and then boosted pump enters electrolytic cell, and flow can be
35L/H.The embodiment of the present application using hydrogen peroxide and ferrous sulfate, under additional power source effect, acid out can be gone out in a cell
Water carries out electrocatalytic oxidation, aoxidized-it is electrolysed water outlet.In embodiments herein, 10% mass is supplemented in electrolytic cell dense
Degree hydrogen peroxide 290~300mL/H, 10% 400~450mL/H of mass concentration copperas solution.The electricity of the electrocatalytic oxidation
Pressure can be 18V；Residence time is 15min, and water outlet pH value is in 4-5 or so.
Aoxidized-be electrolysed water outlet after, the application preferably also includes：The oxidation-electrolysis water outlet is neutralized successively,
Coagulation and precipitation, obtain final outflow water.
The embodiment of the present application can add the alkaline matters such as calcium oxide, calcium hydroxide, carry out neutralization coagulation.The one of the application
In a little embodiments, the consumption for neutralizing calcium oxide used can be 1.5~2kg/ tons of water.In other embodiments of the application,
Calcium hydroxide 105g/H is added, 10% calcium hydroxide as 1050mL/H is made into.
The embodiment of the present application is neutralized to pH value more than 10.5, is arranged outside water outlet.The embodiment of the present application is preferably in coagulating sedimentation
PAM is added simultaneously in pond, coagulant precipitation is effectively carried out.In some embodiments of the present application, the PAM of 3~4ppm can be added i.e.
(PAM is made into 1/1000 to 105~140mg/H, i.e.,
105~140mL/H, peristaltic pump is added).The embodiment of the present application can be 1h, warp in the residence time of coagulative precipitation tank
Precipitation is crossed, the micro- yellow final outflow water of COD about 250mg/L, colourity is obtained.
In sum, the cellulosic ethanol production Waste Water Treatment that the application is provided mainly includes：Biochemical treatment apparatus,
Clear water collecting pit, acid out unit, coagulation unit and precipitation unit.In this application, cellulosic ethanol plant effluent through biochemistry at
After reason device treatment, clear water collecting pit is collected in.The application mainly utilizes acid out technology advanced treating cellulosic ethanol waste water, its
Acid out process is in acid condition, lignin in the waste water is converted into suspension by solubilised state and separate out, then by coagulation,
Precipitation, suspension is effectively removed, so as to realize removing the purpose of lignin.Meanwhile, the application can remove part COD, hence it is evident that
The COD of waste water is reduced, preferable treatment effect is reached.
In order to further illustrate the application, the cellulosic ethanol production waste water provided the application with reference to embodiment
Processing system and its method are described in detail, but they can not be interpreted as the restriction to the application protection domain.
In following examples, PAM used is purchased from Chemical Co., Ltd. of Sunyu of Zhengzhou City, molecular formula：(C3H5NO)n, English
Text：POLYACRYLAMIDE, referred to as：PAM, solid content：90%, PH use scope：4-14, CAS：9003-05-8；62649-
23-4；25085-02-3；No. EINECS：203-750-9, HS are encoded：3906901000.
Embodiment
Using the Waste Water Treatment shown in Fig. 1, wherein, biochemical treatment apparatus include that the anaerobic unit being sequentially communicated is become reconciled
Oxygen unit；Clear water reserviors are the open square plastic charging basket of (each one meter of length, width and height), and volume is 1m3；There are a hanging PVC materials on edge on square bucket
The water inlet of matter gos deep into about 0.2 meter of clear water reserviors, and water flow velocity is 40L/h.
Treating capacity is 1m2The cellulosic ethanol plant effluent of/d is collected in clear through anaerobism, aerobic biochemical treatment device treatment
Pond 1, the 2A regions of first order coagulating sedimentation groove 2 (1 grade of coagulating sedimentation groove) are pumped to by measuring pump.2A areas add 20% sulfuric acid
And ferrous sulfate (is matched as 1400mL per hour:17.5g is per hour), bottom is added on using a peristaltic pump, region top
If top cover collects foam.There is cut-off between the cell body of first order coagulating sedimentation groove 2, and interconnected by hole；Channel area divides
For：2A regions are acid out area；2B areas are coagulation area；2C areas are settling zone.
The 2A areas residence time is 20min；2B areas add 3-4ppm PAM i.e. 105-140mg/H, and (PAM is made into 1/1000, i.e.,
105-140ml/H, peristaltic pump is added), the residence time is 20min.The residence time in 2C areas is 40min；The water outlet of gained acid out is passed through
By 2C areas delivery port, dashpot 3 is collected in.Above process step is referred to as acid out process, and the conditional parameter of this part is referring to table
1, table 1 is the conditional parameter of acid out process in the embodiment of the present application.
The conditional parameter of acid out process in the embodiment of the present application of table 1
The top of dashpot 3 sets dashpot elevator pump, and the flow for making electrolytic cell 4 intake is 35L/H.The COD of dashpot 3 is pressed
1600mg/L is counted, the supplement of electrolytic cell 4 hydrogen peroxide (10%) 294mL/H；Ferrous sulfate (10%) 420mL/H；Voltage is 18V；Stop
The time is stayed for 15min, aoxidized-it is electrolysed water outlet.Conditional parameter of oxidation-electrolysis etc. is implemented referring to table 2, table 2 for the application
Oxidization electrolysis optimum results in example.
From 2 grades of coagulating sedimentation grooves 5 are flowed into, channel area is divided into for the water outlet of electrolytic cell 4：5A regions are neutral zone；5B areas
It is coagulation area；5C areas are settling zone.5A areas add calcium hydroxide 105g/H, are made into 10% calcium hydroxide as 1050ml/H；In
With coagulation to pH=10.5, arranged outside water outlet.5B areas add 4ppm PAM i.e. 140mg/H, and (PAM is made into 1/1000, i.e. 105-
140ml/H, peristaltic pump is added).2 grades of residence times of coagulating sedimentation groove 5 are 1h, by after coagulation, precipitation, by 5C areas delivery port
The COD of the final outflow water of discharge is 250mg/L, the micro- Huang of colourity.
Using this area conventional method detect water outlet, the water exit test result in above pilot scale each stage referring to table 3 and Fig. 2,
Table 3 is the water exit test result in the embodiment of the present application pilot scale each stage, the main water process rank that Fig. 2 is provided for the embodiment of the present application
Section design sketch.
As seen from the above embodiment, influent COD is 58320mg/L, and ammonia-nitrogen content is 2556.7mg/L, after the application treatment
The COD of acid out water outlet be 1600~1800mg/L, colourity shoals, water quality clarification.The application mainly utilizes acid out technology depth
Treatment cellulosic ethanol waste water, realizes removing lignin, the purpose such as COD, effectively reduces the COD of waste water, treatment effect compared with
It is good, to promote cellulosic ethanol it is commercialized be smoothed out it is significant.
Oxidization electrolysis optimum results in the embodiment of the present application of table 2
The water exit test result in the embodiment of the present application pilot scale each stage of table 3
Claims (10)
1. a kind of processing system of cellulosic ethanol production waste water, including：
For the biochemical treatment apparatus of biochemical treatment cellulosic ethanol production waste water；
The clear water collecting pit that import is connected with the biochemical treatment apparatus delivery port；
The acid out unit that import is connected with the clear water collecting pit delivery port；
The first coagulation unit being connected with the acid out unit delivery port；
The first precipitation unit that import is connected with the first coagulation unit, first precipitation unit has delivery port.
2. processing system according to claim 1, it is characterised in that the acid out unit, the first coagulation unit and first
Precipitation unit forms the first order coagulating sedimentation groove of integration；In the first order coagulating sedimentation groove cell body, acid out unit,
One coagulation unit and the first precipitation unit have cut-off each other, and are interconnected by hole.
3. processing system according to claim 2, it is characterised in that in the first order coagulating sedimentation groove, acid out unit
Bottom is provided with pump, and top is provided with top cover.
4. the processing system according to any one of claims 1 to 3, it is characterised in that the processing system also includes：
The dashpot that import is connected with the first precipitation unit delivery port；
The electrolytic cell that import is connected with the dashpot delivery port, the electrolytic cell has delivery port.
5. processing system according to claim 4, it is characterised in that the processing system also includes：
The second level coagulating sedimentation groove that import is connected with the electrolytic cell delivery port.
6. processing system according to claim 5, it is characterised in that the second level coagulating sedimentation groove includes：
The neutralisation unit that import is connected with the electrolytic cell delivery port；
The second coagulation unit being connected with the neutralisation unit delivery port；
The second precipitation unit that import is connected with the second coagulation unit, second precipitation unit has delivery port；
In the second level coagulating sedimentation groove cell body, neutralisation unit, the second coagulation unit and the second precipitation unit are each other
There is cut-off, and interconnected by hole.
7. a kind of processing method of cellulosic ethanol production waste water, comprises the following steps：
Cellulosic ethanol production waste water is carried out into biochemical treatment, bio-chemical effluent is obtained；
Acid out is carried out after the bio-chemical effluent is collected, then through coagulation, precipitation, obtains water outlet.
8. processing method according to claim 7, it is characterised in that the pH value of the acid out is below 3；The acid out exists
Coagulant and/or flocculation aid are carried out under conditions of existing.
9. the processing method according to claim 7 or 8, it is characterised in that also include：
Electrocatalytic oxidation will be carried out after the water outlet of coagulation, precipitation is buffered, aoxidized-it is electrolysed water outlet.
10. processing method according to claim 9, it is characterised in that also include：
The oxidation-electrolysis water outlet is neutralized successively, coagulation and precipitation, obtain final outflow water.
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