CN107055770A - The method of continuous full-mixing type anaerobic reaction treatment high concentration cassava alcohol waste water - Google Patents
The method of continuous full-mixing type anaerobic reaction treatment high concentration cassava alcohol waste water Download PDFInfo
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- CN107055770A CN107055770A CN201710315209.0A CN201710315209A CN107055770A CN 107055770 A CN107055770 A CN 107055770A CN 201710315209 A CN201710315209 A CN 201710315209A CN 107055770 A CN107055770 A CN 107055770A
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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
- C02F3/28—Anaerobic digestion processes
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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
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
- C02F3/2893—Particular arrangements for anaerobic reactors with biogas recycling
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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
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
- C02F2103/325—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters from processes relating to the production of wine products
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/10—Temperature conditions for biological treatment
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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
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
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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
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Sustainable Development (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
A kind of method of continuous full-mixing type anaerobic reaction treatment high concentration cassava alcohol waste water, this method is used as water quality treatment, using anaerobic sludge as seed sludge, method and step using the waste liquid that alcohol distillation tower is discharged：The activation system under the conditions of 50 60 DEG C；Sludge is put into system response device in proportion, sky culture domestication；Cassava alcohol waste water is added in full-mixing type anaerobic reactor and carries out hydraulic mixing, regulation initial load simultaneously gradually steps up load, by the amount of carrying, volumetric loading reaches 79 kg COD/ (m3d), fully contacted by sludge and sewage, organic matter in water is converted into biogas by anaerobic digestion, and water becomes water up to standard；Sample in full-mixing type anaerobic reactor is taken daily, COD is determined with potassium dichromate method；With gas flowmeter accurate measurement methane gas producing amount；Biogas composition chromatographic.The problem of being difficult to handle present method solves highly concentrated suspended solid waste liquid, and improve the gas production and value of discarded object.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, more particularly to a kind of continuous full-mixing type anaerobic reaction treatment cassiri
The method of smart waste water.
Background technology
Cassava is the conventional raw material for producing alcohol fuel, with low cost, and the policy for meeting national " not striving grain with the people " is called,
With preferable economic value.At present, cassava alcohol occupies absolute predominance status in the fuel ethanol production of China, still,
When producing alcohol using cassava, content of organics in a large amount of waste water, waste water can be produced and enriched.National regulation, alcohol industry waste water
The COD concentration values secondary standard of discharge is allowed to be 300 mg/L by processing, primary standard requirement is less than 100 mg/L, therefore useless
Water is needed by dealing carefully with and can discharge, the attention with country to environmental protection, and waste water handling problem has become restriction cassava
The bottleneck of alcohol development, the cassava alcohol waste water treatment process for seeking economical and efficient is urgently solved as numerous cassava alcohol enterprises
The problem of.
In actual production, alcohol waste water generally uses UASB anaerobic digestion process.This technology can remove alcohol waste water
Middle most COD, therefore be used widely in industries such as alcohol sewage disposals.But UASB is to water inlet suspended solids content
It is required that it is higher, and the suspended solids content in cassava alcohol waste water is dense generally between 30~70 g/L, therefore entering
Separation of solid and liquid must be first carried out before UASB.Cassava alcohol waste water viscosity is big, and solid particles are soft, the separation of solid and liquid such as filtering and extruding
Method can not obtain satisfied effect, so as to also have impact on follow-up UASB Effec-tive Function.
Anaerobic digestion process technology main purpose is to remove useless Organic substance in water, to reach the purpose of waste water treatment.Product
Biogas is high-order energy carrier, and processing wastewater to reach standard simultaneously improves biogas yield simultaneously, significant to enterprise's Resource regeneration.
The content of the invention
It is an object of the invention to provide a kind of with continuous full-mixing type anaerobic fermentation producing methane system processing high concentration cassava
The method of alcohol waste water, this method not only solves the problem of suspended solid is difficult to handle, but also it is useless to improve cassava alcohol
Water treatment capacity and methane production.
Realize that above-mentioned purpose uses following technical scheme：
1. a kind of method of continuous full-mixing type anaerobic reaction treatment high concentration cassava alcohol waste water, including it is a kind of can continuous feed
Anaerobic ferment for methane system, the system is by continuous feeders, full-mixing type anaerobic reactor, liquid discharge device and sludge gas collecting device
Four parts are constituted, and the waste liquid that described method is discharged using alcohol distillation tower is as water quality treatment, with manufacturing enterprise's wastewater treatment
Stand or other source anaerobic sludge as seed sludge, it is characterised in that its processing method comprises the steps：
A. the activation system under the conditions of 50-60 DEG C；
B. sludge is put into system response device in proportion, sky culture is tamed for 1-3 days；
C. appropriate cassava alcohol waste water is added in full-mixing type anaerobic reactor and stirred by Hydraulic Circulation within the 2-4 day
Mix, regulation initial load 1.0-3.0 kg COD/ (m3d), and gradually step up load, by the 30-45 days amounts of carrying, volumetric loading
7-9 kg COD/ (m3d) are reached, are fully contacted by sludge and waste water in full-mixing type anaerobic reactor, anaerobic digestion will
Organic matter in water is converted into biogas；
D. supernatant is taken after taking sample in full-mixing type anaerobic reactor, centrifugation 3-6 min daily, is determined using potassium dichromate method
COD；
E. methane gas producing amount uses gas flowmeter accurate measurement；
F. biogas composition uses chromatographic.
Further, the technical indicator of water quality treatment is：Poor liquid COD 20000-80000（mg/L）, pH3.0-6.0.
Further, according to volume ratio toward adding sludge, sludge addition dry weight 2-20% in water quality.
Further, described sludge moisture content is 60-99%.
Further, the cassava alcohol waste water being added in full-mixing type anaerobic reactor is anti-by circulating pump and full-mixing type anaerobic
Inlet distribution device special in device is answered to carry out hydraulic mixing.
Further, the chromatographic column of gas chromatograph be packed column TDX-01, length 2-5m, it is preceding using constant flow rate pattern
Injection port, rear detector is exported as atmospheric pressure, and injection port is dottle pin purging filling injection port.
Further, under the conditions of 50-60 DEG C, the methane production of system is maximum.
Further, described system has regulation pH ability itself, and the pH of system is between 7.0-7.8.
Compared with prior art, the continuous entirely mixed reaction treatment cassava alcohol waste water of the present invention, can greatly improve cassava alcohol
Waste treatment capacity and methane production.Cassava-based ethanol waste water is handled using this method, fully contacted by sludge and waste water, by water
In organic matter biogas is converted into by anaerobic bacteria, realize discarded object higher value application.The present invention is reacted using full-mixing type anaerobic
Device, is not required suspended solids content, can remove Wastewater Pretreatment slag removal.Compared with the operation under middle temperature, in height
The sludge activity of the full-mixing type anaerobic reactor run under the conditions of temperature is high, can bear higher load, at the same gas production also compared with
It is many.Maintain the temperature of cassava alcohol waste water at 50-60 DEG C, full-mixing type anaerobic processing is carried out using this method, can be given full play to
The advantage of the present invention, while waste water is directly entered reactor without separation of solid and liquid, ensure that Flow of Goods and Materials is in preferable mixed
Conjunction state, makes sludge and alcohol waste water fully contact, and the controllable wastewater treatment time, and suspended solid can also carry out anaerobic fermentation
Digestion, solves the problem of suspended solid is difficult to handle, and improve the gas production and value of discarded object.
Brief description of the drawings
Fig. 1 is the system structure diagram that the present invention is used.
Fig. 2 is volumetric loading and COD clearance variation diagrams in running of the present invention.
Fig. 3 is that volumetric loading and aerogenesis compare variation diagram in running of the present invention.
Fig. 4 is methane content variation diagram in gas in running of the present invention.
Fig. 5 is that when methane content varies with temperature figure to aerogenesis of the present invention.
Fig. 6 is reactor pH variation diagrams in running of the present invention.
Marked in figure：Feeder 1, feed pump 2, full-mixing type anaerobic reactor 3, liquid discharge device 4, sludge gas collecting device 5, electricity
Pole 6/7.
Concrete operation method embodiment
Embodiment 1
(1) water quality is chosen
The waste liquid that alcohol distillation tower is discharged is as water quality treatment, and COD contents are higher in waste water, and wherein carbon, nitrogen and phosphorus element can
Requirement of the microorganism to nutrients is met, without additionally adding nutriment again；The technical indicator of water quality is：Poor liquid temperature degree is up to
± 90 DEG C, its water quality is COD（mg/L）20000-60000, pH3.0-6.0, SS（g/L）25-40.
(2) operating method
A. the activation system under the conditions of 55 DEG C；
B. according to volume ratio toward adding sludge, mud dry weight addition 4%, by the sludge that water content is 75.6%, input in water quality
Into system response device, sludge sky culture is tamed for 1 day；
C. cassava alcohol waste water is added in full-mixing type anaerobic reactor by special in circulating pump and reactor to enter within the 2nd day
Water distributor carries out hydraulic mixing mixing.The kg COD/ (m3d) of initial load 2.0 are adjusted, and gradually step up load, by 40
Its amount of carrying, volumetric loading reaches 8.6 kg COD/ (m3d), abundant by sludge and sewage in full-mixing type anaerobic reactor
Organic matter in water is converted into biogas by contact, anaerobic digestion；
D. the mL of sample 500 in reactor is taken daily, is taken supernatant after taking the min of part centrifugal 5, is determined using potassium dichromate method
COD；
E. methane gas producing amount uses gas flowmeter accurate measurement；
F. biogas composition uses chromatographic.The chromatographic column of gas chromatograph is packed column (TDX-01,2m),
Using constant flow rate pattern, preceding injection port, rear detector is exported as atmospheric pressure, injection port is dottle pin purging filling injection port, always
Flow is 40.1 mL/min.Carrier gas is hydrogen, and hydrogen methane flow is 39.2 mL/min, the setting of gas chromatograph post case temperature
For 70 DEG C；
G. in reactor, fully contacted by sludge and sewage, the organic matter in water is converted into biogas by anaerobic digestion, water becomes
Into water up to standard；
H. water up to standard enters liquid discharge device 4, and biogas is collected by sludge gas collecting device 5.
I. pH value is determined using precision acidity meter.
Through examining, this method COD clearances are more than 90%, when volumetric loading is 6.8 kg COD/ (m3.d), 1 kg
The m3 of COD methane phases 0.30.Under the conditions of 58 DEG C, the methane production of system is maximum.
Embodiment 2
This method using can the system of continuous feed waste water is handled, water after treatment becomes water up to standard, also simultaneously
Obtain biogas.The structure of system is shown in that Fig. 1, including continuous feeders 1, feed pump 2, anaerobic reactor 3, liquid discharge device 4, biogas are received
Four parts of acquisition means 5 and temperature pH electrodes.The total measurement (volume) of reactor is 5000M3, and wherein 4500M3 is used for handling waste water, on
The 500M3 in portion is used for storing digestion biogas, and the hydraulic system carried using tank body carries out material mixing.Using directly heating
And heat-exchange system, 55 DEG C of keeping temperature.Waste water enters in reactor through feed pump from feed system.
Operating procedure is as follows：
A. the activation system under the conditions of 58 DEG C；
B. according to the volume ratio of mud dry weight addition 6% toward sludge is added in water quality, by containing for being tamed for 2 days by empty culture
Water is injected into reactor for 80% sludge by continuous feeders through feed pump, and the 3rd day by cassava alcohol waste water through charging
Pump carries out hydraulic mixing from continuous feeders is added to reactor with the stirring system in reactor, makes organic in material
Matter mixing is abundant and is fully reacted with anaerobic bacteria flora, and the organic matter in water is converted into biogas by anaerobic digestion, to increase gas production.
The gas produced simultaneously by stirring in accelerating reactor is risen very rapidly up to above anaerobic reactor.Reactor initial load 1.5
Kg COD/ (m3d), gradually stepped up load, by 35 days amounts of carrying, and volumetric loading reaches 8.0 kg COD/ (m3d)；
C. supernatant is taken after taking sample in full-mixing type anaerobic reactor, 8 min of centrifugation daily, is determined using potassium dichromate method
COD；
D. heat-exchange system is provided with outside reactor, and the pH electrodes and temperature electrode of on-line monitoring are realized to reaction system.
E. in reactor, fully contacted by sludge and sewage, the organic matter in water is converted into natural pond by anaerobic digestion
Gas, water becomes water up to standard；
F. biogas composition uses chromatographic, and carrier gas is hydrogen, and hydrogen methane flow is 39.2 mL/min, gas
Chromatography post case temperature is set as 70 DEG C；
G. sludge gas collecting device is collected to biogas, and gas production is measured using gas flowmeter；
H. water up to standard enters liquid discharge device 4;
I. pH value is determined using precision acidity meter.
Through examining, this method COD clearances are more than 85%, under the conditions of 56 DEG C, and the methane production of system is maximum.
With reference to accompanying drawing to realizing the further analysis of goal of the invention
1. influence of the volumetric loading to COD clearances
Start reaction system under the conditions of 55 DEG C, because the waste water of use comes from cassava alcohol manufacturing enterprise, sludge comes from the enterprise
Alcohol waste water treating stations anaerobic sludge, flora is higher to waste water fitness, so start-up course is relatively smooth, the used time is shorter,
Eliminate breeding strain and the process of domestication.Initial reaction stage, by 1 sky culture, starts to add cassava alcohol waste water for second day,
The kg COD/ (m3d) of initial load 2.0, gradually stepped up load, by 40 days amounts of carrying, and load reaches 8.6 kg COD/ (m3
d).System starts and the variation relation of operation phase COD clearance and volumetric loading is shown in Fig. 2.
Prove that high temperature anaerobic processing cassava alcohol waste water can remove the most COD in waste water by Fig. 2.Ensureing
COD clearances are more than 90%, and when volumetric loading is 6.8 kg COD/ (m3.d), methane production reaches maximum；Volumetric loading
Too high anaerobic bacteria to be caused to be poisoned, aerogenesis is suppressed.Under the conditions of 58 DEG C, the methane production of reactor is maximum.Maintain 6.8 kg
COD/ (m3.d) volumetric loading, 58 DEG C of operation reactors, reactor methane phase efficiency highest, 1 kg COD methane production reaches
To 0.30 m3.
2. influence of the volumetric loading to production rate of methane
System starts and Fig. 3 is shown in the change of operation phase volumetric loading and production rate of methane.Cassava alcohol waste water contains high concentration
Organic matter, production rate of methane be weigh anaerobic fermentation effect important indicator.From the figure 3, it may be seen that the production rate of methane of reactor
Enter stationary phase after short-term fluctuation, maintain essentially between 0.4 ~ 0.55, when volumetric loading is more than 6.8 kg/ (m3
D) after, aerogenesis shows obvious downward trend than fluctuating, and volumetric loading is crossed high yield gas and is suppressed.
3. the relation of methane content in volumetric loading and gas
Fig. 4 is shown in the change of methane content in gas, as shown in Figure 4, and after system start completion, methane content is remained in gas
Between 45 ~ 55%.But, when volumetric loading is less than 7.0 kg/ (m3d), in gas methane content substantially remain in 50% with
On, as volumetric loading lifting is to more than 7.0 kg/(m3d), methane content drops to less than 50%.Illustrate to tend in system
After stable, when system volume load is maintained at 7.0 kg/ (m3d) below, methanogen can be by feed liquor in sludge
Organic matter is converted into methane to greatest extent.
Gas chromatographic analysis result to gas component shows that biogas Main Ingredients and Appearance is CH4 and CO2.There are some researches show go
Except 1 kg COD theoretical methane production is 0.35 m3.And this test reactor stable operation stage, 1 kg COD methane production
Amount changes between 0.2~0.29m3.When volumetric loading is less than 7.0 kg/ (m3d), 1 kg COD methane production exists substantially
0.25 more than m3.Therefore, ensureing COD clearances more than 90%, and obtaining higher methane production, optimal volume is born
Lotus is 6.8 kg/ (m3d), and on this condition, aerogenesis ratio and methane production are at a high position.
4. influence of the temperature change to reactor aerogenesis when methane content
Reactor is influenceed in order to verify temperature, after reactor is run 40 days, each side is kept under stable condition, keep holding
The product kg/ of load 6.8 (m3d), changes temperature of reactor, make reactor respectively 55,56,58,59,60,61,62,63 DEG C of bars
Run under part, run 3 days under each temperature conditionss, determine reactor the aerogenesis ratio and methane content of the 3rd day under the conditions of each, tied
Fruit sees Fig. 5.As shown in Figure 5, at 58 DEG C, aerogenesis ratio reaches maximum, shows that in the case of 58 DEG C, microbial activity is the most
Vigorous, the biogas of generation is most, but methane content of bilogas reaches maximum at 60 DEG C, illustrates at 60 DEG C, methane phase
Bacterium is most active.Between 55 ~ 64 DEG C, methane content changes between 54 ~ 56% in gas, and amplitude of variation is little.In addition, actual raw
In production, cassava alcohol wastewater temperature is basic at 60 DEG C or so, is maintained at 58 DEG C relatively easily, methane production is also higher, therefore
It is most appropriate from 58 DEG C.
Influence of the 5.pH changes to aerogenesis when methane content
PH value is also one of influence most important factor of fermentation process, and Fig. 6 is shown in reactor pH change in running, experiment
In, the waste water is gradually pumped into reaction system by the pH value of charging between 4.0 ~ 4.2, and the pH value of system does not occur substantially
Fluctuation, is remained between 7.3 ~ 7.5.Alkaline matter is not added in process of the test into reactor, reactor still is able to
Normal operation, shows that reactor itself has stronger pH regulating powers.
Above-described embodiment only expresses one embodiment of the present invention, but therefore can not be interpreted as to model of the present invention
The limitation enclosed.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, also
Several modifications and improvements can be made, these belong to protection scope of the present invention.
Claims (8)
1. a kind of method of continuous full-mixing type anaerobic reaction treatment high concentration cassava alcohol waste water, including it is a kind of can continuous feed
Anaerobic ferment for methane system, the system is by continuous feeders, full-mixing type anaerobic reactor, liquid discharge device and sludge gas collecting device
Four parts are constituted, and the waste liquid that described method is discharged using alcohol distillation tower is as water quality treatment, with manufacturing enterprise's wastewater treatment
Stand or other source anaerobic sludge as seed sludge, it is characterised in that its processing method comprises the steps：
A. the activation system under the conditions of 50-60 DEG C；
B. sludge is put into system response device in proportion, sky culture is tamed for 1-3 days；
C. appropriate cassava alcohol waste water is added in full-mixing type anaerobic reactor and stirred by Hydraulic Circulation within the 2-4 day
Mix, regulation initial load 1.0-3.0 kg COD/ (m3d), and gradually step up load, by the 30-45 days amounts of carrying, volumetric loading
7-9 kg COD/ (m3d) are reached, are fully contacted by sludge and waste water in full-mixing type anaerobic reactor, anaerobic digestion will
Organic matter in water is converted into biogas；
D. supernatant is taken after taking sample in full-mixing type anaerobic reactor, centrifugation 3-6 min daily, is determined using potassium dichromate method
COD；
E. methane gas producing amount uses gas flowmeter accurate measurement；
F. biogas composition uses chromatographic.
2. the method for continuous complete mixed reaction treatment cassava alcohol waste water according to claim 1, it is characterised in that processing
The technical indicator of water quality is：Poor liquid COD 20000-80000（g/L）, pH3.0-6.0.
3. the method for continuous complete mixed reaction treatment cassava alcohol waste water according to claim 1, it is characterised in that according to body
Product is than toward adding sludge, sludge addition dry weight 2-20% in water quality.
4. the method for the continuous complete mixed reaction treatment cassava alcohol waste water according to claim 1 or 3, it is characterised in that institute
The sludge moisture content stated is 60-99%.
5. the method for continuous complete mixed reaction treatment cassava alcohol waste water according to claim 1, it is characterised in that be added to
Cassava alcohol waste water in full-mixing type anaerobic reactor passes through inlet distribution special in circulating pump and full-mixing type anaerobic reactor
Device carries out hydraulic mixing.
6. the method for continuous complete mixed reaction treatment cassava alcohol waste water according to claim 1, it is characterised in that gas phase color
The chromatographic column of spectrometer is packed column TDX-01, length 2-5m, using constant flow rate pattern, preceding injection port, rear detector, outlet
For atmospheric pressure, injection port is dottle pin purging filling injection port.
7. the method for the continuous complete mixed reaction treatment cassava alcohol waste water according to claim any one of 1-6, its feature exists
In under the conditions of 50-60 DEG C, the methane production of system is maximum.
8. the method for continuous complete mixed reaction treatment cassava alcohol waste water according to claim 1, it is characterised in that described
System has regulation pH ability itself, and the pH of system is between 7.0-7.8.
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