CN110078241A - The processing system and method for biogas slurry after a kind of vinasse anaerobic fermentation - Google Patents

The processing system and method for biogas slurry after a kind of vinasse anaerobic fermentation Download PDF

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Publication number
CN110078241A
CN110078241A CN201910456835.0A CN201910456835A CN110078241A CN 110078241 A CN110078241 A CN 110078241A CN 201910456835 A CN201910456835 A CN 201910456835A CN 110078241 A CN110078241 A CN 110078241A
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filtration
membrane
filter
reverse osmosis
processing
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胡惊雷
方忠海
胡娜
何姣
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Meijing (beijing) Environmental Protection Tech Co Ltd
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Meijing (beijing) Environmental Protection Tech Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/38Treatment of water, waste water, or sewage by centrifugal separation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/32Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
    • C02F2103/325Nature 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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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

An embodiment of the present invention provides the processing system and method for biogas slurry after a kind of vinasse anaerobic fermentation, which includes the centrifugal separation unit being sequentially connected, press filtration unit, medium filtration unit, membrane filter unit, nano-filtration unit and reverse osmosis units.The processing system of biogas slurry after an embodiment of the present invention vinasse anaerobic fermentation can respectively recycle organic and inorganic nutrient substance, the water etc. in biogas slurry, realize the recycling treatment of biogas slurry after vinasse anaerobic fermentation.

Description

The processing system and method for biogas slurry after a kind of vinasse anaerobic fermentation
Technical field
The present invention relates to wastewater treatment, the processing system and method for biogas slurry after specially a kind of vinasse anaerobic fermentation.
Background technique
Brewery can generate a large amount of vinasse in process of production, and vinasse are usually and handle through anaerobic fermentation at present, and vinasse are detested Biogas slurry is formed after aerobe fermentation, COD concentration reaches tens of thousands of mg/litres in usual biogas slurry, and main component is organic matter, humic acid and albumen Matter, the ammonia nitrogen of thousands of mg/litres, several hundred potassium and phosphorus to thousands of mg/litres, and a small amount of sulfate, calcium and magnesium etc., are very Good organic fertilizer, but biogas slurry is there is also very big difficulty on.It is mainly manifested in:
1, biogas slurry volume is big, and fertility content is low, and long distance transportation is uneconomical, and nearest returning to the field application is difficult to dispose again.
It is to resource and greatly unrestrained if investment and operating cost are all very high 2, as qualified discharge after sewage treatment Take.
Therefore biogas slurry is made full use of just to carry out concentration to biogas slurry, common concentration thinking includes low temperature Evaporation and concentration and film concentration etc., but since solid content is up to 2% or so in biogas slurry, turbidity is high, colloidal substance is more, is evaporating In the process with the evaporation of dampening, biogas slurry spumes, sticks the scenes such as wall, thick, fouling, and evaporation is difficult to continue progress.In addition, Ammonium salt in biogas slurry can be decomposed into gas phase, and needing to handle could discharge, and evaporation condensed water contains large amount of organic and ammonia, also can not It directly utilizes, therefore is concentrated by evaporation and does not also have economic feasibility.Similarly, since impurity is more in biogas slurry, colloidal substance is more, to film It causes dirt stifled, is directly concentrated with film also infeasible.
Summary of the invention
A primary object of the present invention is to provide a kind of processing system of biogas slurry after vinasse anaerobic fermentation, including successively Connected centrifugal separation unit, press filtration unit, medium filtration unit, membrane filter unit, nano-filtration unit and reverse osmosis units.
According to an embodiment of the present invention, the centrifugal separation unit includes the centrifuge for one or more levels separation, The press filtration unit includes filter press, and the medium filtration unit includes one or more levels medium filter, and the film filtering is single Member includes hyperfiltration membrane assembly or micro-filtration membrane module, and the nano-filtration unit includes nanofiltration membrane component, and the reverse osmosis units include anti- Permeable membrane element.
According to an embodiment of the present invention, the centrifugal separation unit includes Horizontal helical type centrifuge and filtering type or disc-type Centrifuge, the Horizontal helical type centrifuge are used for two-stage centrifugal for first-stage centrifugal processing, the filtering type or disc centrifuge Processing.
According to an embodiment of the present invention, the medium filtration unit includes two-stage filter.
Invention further provides a kind of processing methods of biogas slurry after vinasse anaerobic fermentation, include the following steps: to be centrifuged Separating step, for processing to be centrifuged in biogas slurry after the vinasse anaerobic fermentation;Filters pressing step is used for the centrifugation The separating liquid of separating step carries out pressure filtration processing;Media filtration step, for the water outlet of the filters pressing step to be situated between Matter filtration treatment;Membrane filtration step, for the water outlet of the media filtration step to be carried out film filtration treatment;Nano-filtration step is used In the permeate of the membrane filtration step is carried out nanofiltration processing;And reverse osmosis step, for receiving the nano-filtration step Filter membrane permeate carries out reverse osmosis treatment.
According to an embodiment of the present invention, it the treating method comprises and added into the separating liquid of the step with centrifugal separation Filter aid is to carry out the pressure filtration processing.
According to an embodiment of the present invention, the filter aid is diatomite, and the quality of the filter aid is the centrifugation point From 10~100% of suspended matter quality in the separating liquid of step, the granularity of the filter aid is 0.5~5 micron.
According to an embodiment of the present invention, in the nano-filtration step, the permeate of nanofiltration membrane and the body of nanofiltration inflow Product is than being 50~90%;And/or in the reverse osmosis step, the permeate of reverse osmosis membrane and the volume of feed water by reverse osmosis amount Than being 50~95%.
According to an embodiment of the present invention, the step with centrifugal separation includes two-stage centrifugal separating treatment, the medium mistake Filtering step includes double-filtration.
According to an embodiment of the present invention, the membrane filtration step is filtered using cross-flow filtration mode or submerged membrane.
The processing system of biogas slurry after an embodiment of the present invention vinasse anaerobic fermentation, can be respectively to the organic and nothing in biogas slurry Machine nutriment, water etc. are recycled, and the recycling treatment of biogas slurry after vinasse anaerobic fermentation is realized.
Detailed description of the invention
Consider following the following detailed description of the embodiment of the present invention in conjunction with the accompanying drawings, various targets of the invention, Feature and advantage will become apparent.Attached drawing is only exemplary diagram of the invention, is not necessarily drawn to scale. In the accompanying drawings, same appended drawing reference always shows same or similar component.Wherein:
Fig. 1 be an embodiment of the present invention vinasse anaerobic fermentation after biogas slurry processing method flow chart;
Wherein, the reference numerals are as follows:
1, centrifugal separation unit;2, press filtration unit;3, medium filtration unit;4, membrane filter unit;5, nano-filtration unit;6, anti- Permeation unit;
A, biogas slurry;B, solid filter-aids;C, centrifugal filter cake;D, filters pressing filter cake;E, hyperfiltration reverse-rinsing water;F, ultrafiltration permeate; G, nanofiltration concentrate;H, nanofiltration permeate liquid;I, reverse osmosis to penetrate water;J, reverse osmosis concentrated water.
Specific embodiment
The exemplary embodiment for embodying feature of present invention and advantage will describe in detail in the following description.It should be understood that The present invention can have various variations in different embodiments, neither depart from the scope of the present invention, and theory therein Bright and diagram inherently is illustrated as being used, rather than to limit the present invention.
An embodiment of the present invention provides a kind of processing method of biogas slurry after vinasse anaerobic fermentation, can be used for detesting vinasse Biogas slurry is handled after aerobe fermentation, recycles organic and inorganic nutrient substance and water.
The processing method of biogas slurry after the vinasse anaerobic fermentation of an embodiment of the present invention, comprising:
Step with centrifugal separation, for processing to be centrifuged in biogas slurry after vinasse anaerobic fermentation;
Filters pressing step, for the separating liquid of step with centrifugal separation to be carried out pressure filtration processing;
Media filtration step, for the water outlet of filters pressing step to be carried out media filtration processing;
Membrane filtration step, for the water outlet of media filtration step to be carried out film filtration treatment;
Nano-filtration step, for the permeate of membrane filtration step to be carried out nanofiltration processing, nanofiltration retentate fluid is directly utilized, nanofiltration Film permeate is sent to reverse osmosis step processing;And
Reverse osmosis step, for the nanofiltration membrane permeate of nano-filtration step to be carried out reverse osmosis treatment.
An embodiment of the present invention provides a kind of processing system of biogas slurry after vinasse anaerobic fermentation, can carry out biogas slurry The concentration of big multiple, all kinds of nutriments can be recycled, and water also all obtains the recycling treatment of reuse, locates simultaneously Reason expense is low, system can be run steadily in the long term.
As shown in connection with fig. 1, after the vinasse anaerobic fermentation of an embodiment of the present invention biogas slurry processing system, including successively phase Centrifugal separation unit 1, press filtration unit 2, medium filtration unit 3, membrane filter unit 4, nano-filtration unit 5 and reverse osmosis units even 6。
Centrifugal separation unit 1 is for being centrifuged processing, centrifuging treatment to the biogas slurry A after vinasse anaerobic fermentation It may include one or more levels centrifuge separation, in order to isolate solid matter as much as possible.Preferably, centrifuging treatment packet Include two-stage centrifugal separation.Centrifugal separation unit 1 includes an at least desk centrifuge, for implementing centrifuging treatment.The present invention couple Centrifuge does not have special restriction, and the common centrifuge in this field can be used.
In an embodiment, centrifugal separation unit 1 includes Horizontal helical type centrifuge and filtering type (or disc-type) centrifuge, Preferably, first-stage centrifugal separation uses Horizontal helical type centrifuge, and two-stage centrifugal separation uses filtering type or disc centrifuge.
In an embodiment, horizontal helical type and perforated wall centrifuge revolving speed can be 1000~4000rpm (rev/min), It further preferably can be 2500~3500rpm, to be isolated from solution by the solid matter in biogas slurry is as much as possible Come.
In the centrifuging treatment of an embodiment of the present invention, the solids such as rice husk in biogas slurry A biogas residue because with water specific gravity not With and realize separation under the effect of the centrifugal force of centrifuge, two kinds of logistics of centrifugal filter cake C and centrate are obtained;Wherein, than Weight is larger and the solid matter that can be centrifugated forms filter cake, centrate include organic matter, colloid, inorganic salts, water with And the solid particulate matter of centrifuge separation can not be passed through.Centrifugal filter cake C can be directly used as SOLID ORGANIC fertilizer, and centrate enters Subsequent press filtration unit 2 carries out filters pressing processing.
Press filtration unit 2 is connected with centrifugal separation unit 1, to centrate that centrifugal separation unit 1 is isolated into The processing of row pressure filtration.Centrate handles through pressure filtration and is separated into filters pressing filter cake D and pressure filtration yielding water, filters pressing filter cake D It can be used for SOLID ORGANIC fertilizer directly to use, pressure filtration yielding water enters subsequent medium filtration unit 3 and carries out media filtration processing.
Press filtration unit 2 includes filter press, for implementing pressure filtration processing.The present invention has no used filter press Special restriction can use filter-pressing device commonly used in the art, preferably with air dried filter press so as to as needed Control filter cake moisture content.
In an embodiment, non-woven fabrics is can be used as filter cloth in filter press.
In an embodiment, due to containing a large amount of colloids and fine solid suspension in centrate, filtering These colloids and suspended matter can block filter cloth quickly in the process causes filter process that can not carry out, and blocks, improved in order to prevent Filtration flux, can add solid filter-aids B into centrate, and solid filter-aids B is specifically as follows such as diatomite.Solid helps The addition of filtering agent B can effectively solve the problem that suspended matter and colloidal substance block up problem to the dirt of filter device in biogas slurry, to guarantee natural pond Liquid treating system is long-term, stablizes, reliably runs.
In an embodiment, the additive amount (quality) of solid filter-aids B can be suspension content in centrate 10~100wt%, preferably 50~100wt%.The particle size range of solid filter-aids B can be 0.5~5 micron, preferably 1 ~3 microns.
Medium filtration unit 3 is connected with press filtration unit 2, carries out media filtration processing to the water outlet to press filtration unit 2.It is situated between Matter filtration treatment may include being filtered in the presence of one or more filter mediums, so that the suspension content in pressure filtration yielding water It further decreases, obtains media filtration water outlet, media filtration water outlet enters subsequent film from after the discharge of medium filtration unit 3 and filters Unit 4 carries out film filtration treatment.
Medium filtration unit 3 includes medium filter, for implementing media filtration processing.The present invention is for medium filter Form be not particularly limited, can be used medium filter commonly used in the art, medium filter can be using vertical, single Layer is horizontal or double-deck horizontal, and filter tank also can be used.
In an embodiment, medium filtration unit 3 includes one or more levels medium filter, preferably two-stage.
The present invention is also not particularly limited the type of filter medium, can be used one or more commonly used in the art Filter medium, such as quartz sand, anthracite etc..In an embodiment, using double media filtrations, filter medium can be selected Quartz sand and anthracite, it is preferable that the granularity of filter medium can be with are as follows: 0.4~0.6mm of quartz sand, 0.8~1.2mm of anthracite, Thickness of filter bed can be with are as follows: quartz sand 800mm, anthracite 400mm, it can also be according to water quality situation appropriate adjustment.
Membrane filter unit 4 is connected with medium filtration unit 3, carries out at film filtering to the water outlet to medium filtration unit 3 Reason.It can remove residual suspended matter and colloid in waste water by the filtration treatment of membrane filter unit 4, be less than the SDI value of waste water 3, to meet the water inlet requirement of subsequent nano-filtration film filtration treatment.Media filtration water outlet is separated into hyperfiltration reverse-rinsing through film filtration treatment Water E (either micro-filtration backwash water) and ultrafiltration permeate F (or micro-filtration permeate), hyperfiltration reverse-rinsing water E send wastewater treatment field to handle, ultrafiltration Permeate F enters subsequent nano-filtration unit 5 and carries out nanofiltration membrane processing.
Media filtration belongs to traditional in-depth filtration, and film filtering belongs to absolute filtration, and filtering accuracy is high, goes turbid and colloid effect Fruit is more preferable.In processing method of the invention, film filtering and media filtration are used cooperatively, and can significantly improve subsequent nano-filtration membranous system The stifled tendency of the dirt of middle colloid.
In an embodiment, membrane filter unit 4 includes filter membrane component, carries out film with the water outlet to medium filtration unit 3 Filtration treatment, filter membrane component can be ultrafiltration membrane or microfiltration membranes.
In an embodiment, membrane filter unit 4 uses hyperfiltration membrane assembly, and hyperfiltration membrane assembly can be used known in the art Any hyperfiltration membrane assembly, more preferably use cross-flow filtration or submerged ultrafiltration component to meet big contamination capacity, can also To select the micro-filtration membrane module with same treatment effect.
Nano-filtration unit 5 is connected with membrane filter unit 4, carries out at nanofiltration to the ultrafiltration permeate F to membrane filter unit 4 Reason, nanofiltration retentate fluid directly utilize.
Nano-filtration unit 5 includes nanofiltration membrane component, to carry out nanofiltration processing.Ammonium hydrogen carbonate, sodium chloride (potassium), sodium nitrate (potassium) Nanofiltration membrane can be penetrated with water, and major part organic matter and SO4 2-、Ca2+、Mg2+、PO4 3-Nanofiltration membrane cannot be penetrated.Therefore, nanofiltration Ultrafiltration permeate F is divided into two streams by membrane module, i.e., rich in ammonium hydrogen carbonate, sodium chloride, sodium nitrate nanofiltration permeate liquid H and Rich in organic matter and SO4 2-、Ca2+、Mg2+、PO4 3-Nanofiltration concentrate G.Nanofiltration concentrate G can be utilized directly as organic fertilizer Or continue to extract high value substance therein, nanofiltration permeate liquid H is sent to the processing of reverse osmosis units 6.
The present invention does not have special restriction to nanofiltration membrane component, it may include the common nanofiltration membrane in this field.In an embodiment party In formula, it can be selected to organic matter and SO4 2-The high nanofiltration membrane of removal rate.
In an embodiment, the inflow temperature of nanofiltration membrane can be 5~40 DEG C, preferably 10~35 DEG C, further excellent 25~30 DEG C are selected as, so as to which the concentration of nanofiltration concentrate G is concentrated to ideal numerical value as far as possible with lesser energy consumption.
In an embodiment, the ratio between the permeate of nanofiltration membrane and nanofiltration inflow are 50~90% (volume ratios), preferably It is 70~85%.
Reverse osmosis units 6 are connected with nano-filtration unit 5, carry out reverse osmosis place to the nanofiltration permeate liquid H to nano-filtration unit 5 Reason.
Reverse osmosis units 6 include reverse osmosis membrane assembly, to carry out reverse osmosis deaslination processing to nanofiltration permeate liquid H.Due to exhausted Most of salt and whole organic matters cannot penetrate reverse osmosis membrane assembly, and therefore, nanofiltration permeate liquid H is divided into two by reverse osmosis membrane assembly Stock logistics, that is, contain the reverse osmosis reverse osmosis concentrated water J through water I and rich in salinity and organic matter of less salinity.It is reverse osmosis Crossing water I can directly recycle, and reverse osmosis concentrated water J can be used as fertilizer utilization.
In an embodiment, the reverse osmosis membrane assembly of reverse osmosis units 6 can be multisection type, such as two-part, can adopt Final processing unit is formed with different types of a variety of reverse osmosis membrane assemblies, to improve desalting effect.
Nanofiltration permeate liquid H mainly includes inorganic monovalent ion, and the content of organic matter is also less, therefore nanofiltration permeate liquid H can It is not easy so that higher multiple is concentrated in reverse osmosis units 6 dirty stifled.
In an embodiment, in order to recycle moisture as much as possible, the amount of reverse osmosis concentrated water, reverse osmosis units 6 are reduced It preferably include two-pass reverse osmosis film including one or more levels reverse osmosis membrane.
In an embodiment, the ratio between permeate and feed water by reverse osmosis amount of reverse osmosis membrane can be 50~95% (volumes Than), preferably 75~90%.
The processing system of biogas slurry after the vinasse anaerobic fermentation of an embodiment of the present invention, when operation, first by vinasse anaerobism Biogas slurry A after fermentation is sent into the step of processing is centrifuged in centrifugal separation unit 1, obtains centrifugal filter cake C and centrifuge separation Liquid;Then, centrate is sent into press filtration unit 2 and carries out filters pressing processing step, obtain filters pressing filter cake D and pressure filtration yielding water;It Afterwards, pressure filtration yielding water is sent into medium filtration unit 3 and carries out media filtration processing step, obtain media filtration water outlet;Later, will be situated between Matter filtering water outlet is sent into membrane filter unit 4 and carries out film filtration treatment step, obtains hyperfiltration reverse-rinsing water E and ultrafiltration permeate F;It Afterwards, ultrafiltration permeate F is sent into nano-filtration unit 5 and carries out nanofiltration processing step, obtain nanofiltration concentrate G and nanofiltration permeate liquid H;Most Afterwards, nanofiltration permeate liquid H is sent into reverse osmosis units 6 and carries out reverse osmosis treatment step.
Processing system/method of biogas slurry after the vinasse anaerobic fermentation of an embodiment of the present invention, can will be organic in biogas slurry Object, inorganic salts are separated from water, and have recycled therein organic and inorganic nutrient substance, and obtain the water of high quality;It realizes The recycling treatment of biogas slurry after vinasse anaerobic fermentation has significant economic benefit and environmental benefit.
Hereinafter, the processing to biogas slurry after the vinasse anaerobic fermentation of an embodiment of the present invention in conjunction with the drawings and the specific embodiments System/method is described further.
Embodiment
As steps described below carry out vinasse anaerobic fermentation after biogas slurry processing, wherein the relevant parameter of biogas slurry to be processed are as follows:
PH value 8.5;Organic concentration are as follows: CODcr23000mg/L;TDS:19000mg/L;Hardness is (with CaCO3Meter) 688mg/L;Basicity is (with CaCO3Meter) 11400mg/L;Suspended matter 1%;HCO3 -13900mg/L;Ca2+259mg/L;Mg2+ 9.1mg/L;K+1140mg/L;Total phosphorus 310mg/L;NH4 +3625mg/L;Cl-313mg/L;SO4 2-73mg/L。
A, the perforated wall centrifuge by the Horizontal helical type centrifuge of biogas slurry feeding centrifugal separation unit 1 and thereafter carries out centrifugation point From processing, decanter centrifuge revolving speed is 3000rpm;Perforated wall centrifuge revolving speed 2500rpm, 10 microns of filtering accuracy, centrifuge It is discharged suspension content 366mg/L, COD18750mg/L in (centrate).
B, centrifuge is discharged to the filters pressing head tank for being sent into press filtration unit 2, diatomite, diatom are added into filters pressing head tank The dosage of soil is 10kg/ tons of water, and the granularity of diatomite is 3 microns.Then the material of filters pressing head tank is promoted by pump and is sent into pressure Filter carries out filters pressing processing, suspension content 122mg/L, COD16300mg/L in filter press water outlet.
C, filter press water outlet is promoted the medium filter progress media filtration processing for being sent into media units 3, medium mistake by pump Filter is provided with quartz sand and anthracite, wherein quartz sand filling height is 800mm, and anthracite filling height is 400mm, filter Fast 7.0m/h.The non-two-stage series connection of medium filter, medium filter delivery turbidity 617NTU, CODcr14308mg/L.
D, medium filter is discharged to the ultrafiltration membrane treatment system progress ultrafiltration membrance filter processing for being sent into membrane filter unit 4, Ultrafiltration membrane uses Asahi Chemical Industry UHS-620A submerged ultrafiltration, filtration flux 15Lmh/m2.At this point, the water rate of recovery is 95%, out Aqueous suspension ≈ 0mg/L, delivery turbidity are less than 0.1NTU, are discharged CODcr4980mg/L, are discharged SDI value less than 3.
E, ultrafiltration production water enters ultrafiltration pond, and the nanofiltration membrane component system progress nanofiltration of nano-filtration unit 5 is lifted into through pumping Processing, nanofiltration membrane component use GE company DK8040 type nanofiltration membrane component.Nanofiltration permeate liquid CODcr 440mg/L, into reverse osmosis Saturating unit 6;CODcr23100mg/L in nanofiltration membrane trapped fluid.
F, the reverse osmosis membrane apparatus that nanofiltration permeate liquid enters reverse osmosis units 6 carries out reverse osmosis treatment, reverse osmosis membrane apparatus For two-stage, wherein first-stage reverse osmosis is using the rich original part of resistance to reverse osmosis membrane of Tao Shi XC series, with 13Lmh/m2Design flux, carry out Reverse osmosis treatment, the water rate of recovery of first-stage reverse osmosis are 75%.Reverse osmosis produced water TDS is less than 350mg/L, first-stage reverse osmosis concentrated water TDS about 80000mg/L, first-stage reverse osmosis concentrated water CODcr 1760mg/L.Two-pass reverse osmosis membrane module uses Tao Shi XUS180808 Super-pressure reverse osmosis membrane original part, operating pressure 10.5MPa design flux 7Lmh/m2, the reverse osmosis water rate of recovery is 35%.Instead Infiltration produces water TDS and is less than 1000mg/L, concentrated water TDS about 117000mg/L, CODcr 2700mg/L.
By embodiment it is found that being removed by centrifuging treatment and filters pressing processing and having recycled most of solid in biogas slurry Suspended matter, is handled by media filtration and ultrafiltration membrance filter handles remaining suspension object and the colloid eliminated in biogas slurry, by receiving Dissolved organic matter in biogas slurry has been recycled in filter processing, and has retained divalent ion, then makes after reverse osmosis treatment most Water is recycled, and the inorganic monovalents ion such as ammonium hydrogen carbonate, sylvite in biogas slurry is concentrated.
Unless limited otherwise, term used herein is the normally understood meaning of those skilled in the art.
Embodiment described in the invention is merely for exemplary purpose, the protection scope being not intended to limit the invention, Those skilled in the art can be made within the scope of the invention various other replacements, changes and improvements, thus, the present invention is not limited to Above embodiment, and be only defined by the claims.

Claims (10)

1. the processing system of biogas slurry after a kind of vinasse anaerobic fermentation, which is characterized in that including be sequentially connected centrifugal separation unit, Press filtration unit, medium filtration unit, membrane filter unit, nano-filtration unit and reverse osmosis units.
2. system according to claim 1, which is characterized in that the centrifugal separation unit includes for one or more levels point From centrifuge, the press filtration unit includes filter press, and the medium filtration unit includes one or more levels medium filter, institute Stating membrane filter unit includes hyperfiltration membrane assembly or micro-filtration membrane module, and the nano-filtration unit includes nanofiltration membrane component, described reverse osmosis Unit includes reverse osmosis membrane assembly.
3. system according to claim 2, which is characterized in that the centrifugal separation unit includes Horizontal helical type centrifuge and mistake Filter formula or disc centrifuge, the Horizontal helical type centrifuge is for first-stage centrifugal processing, the filtering type or disc centrifuge For two-stage centrifugal processing.
4. system according to claim 2, which is characterized in that the medium filtration unit includes two-stage filter.
5. the processing method of biogas slurry after a kind of vinasse anaerobic fermentation, which comprises the steps of:
Step with centrifugal separation, for processing to be centrifuged in biogas slurry after the vinasse anaerobic fermentation;
Filters pressing step, for the separating liquid of the step with centrifugal separation to be carried out pressure filtration processing;
Media filtration step, for the water outlet of the filters pressing step to be carried out media filtration processing;
Membrane filtration step, for the water outlet of the media filtration step to be carried out film filtration treatment;
Nano-filtration step, for the permeate of the membrane filtration step to be carried out nanofiltration processing;And
Reverse osmosis step, for the nanofiltration membrane permeate of the nano-filtration step to be carried out reverse osmosis treatment.
6. according to the method described in claim 5, it is characterised in that it includes being added into the separating liquid of the step with centrifugal separation Filter aid is to carry out the pressure filtration processing.
7. according to the method described in claim 6, it is characterized in that, the filter aid is diatomite, the quality of the filter aid It is 10~100% of suspended matter quality in the separating liquid of the step with centrifugal separation, the granularity of the filter aid is 0.5~5 micro- Rice.
8. according to the method described in claim 5, it is characterized in that, in the nano-filtration step, the permeate of nanofiltration membrane with receive The volume ratio of filter influent amount is 50~90%;And/or
In the reverse osmosis step, the permeate of reverse osmosis membrane and the volume ratio of feed water by reverse osmosis amount are 50~95%.
9. the method according to any one of claim 5 to 8, which is characterized in that the step with centrifugal separation includes two-stage Centrifuging treatment, the media filtration step includes double-filtration.
10. the method according to any one of claim 5 to 8, which is characterized in that the membrane filtration step uses cross-flow Filter mode or submerged membrane filtering.
CN201910456835.0A 2019-05-29 2019-05-29 The processing system and method for biogas slurry after a kind of vinasse anaerobic fermentation Pending CN110078241A (en)

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