CN108485931B - Continuous treatment system for treating fermentation biogas slurry based on chlorella - Google Patents
Continuous treatment system for treating fermentation biogas slurry based on chlorella Download PDFInfo
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- CN108485931B CN108485931B CN201810419018.3A CN201810419018A CN108485931B CN 108485931 B CN108485931 B CN 108485931B CN 201810419018 A CN201810419018 A CN 201810419018A CN 108485931 B CN108485931 B CN 108485931B
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- 239000002002 slurry Substances 0.000 title claims abstract description 82
- 241000195649 Chlorella <Chlorellales> Species 0.000 title claims abstract description 75
- 238000000855 fermentation Methods 0.000 title claims abstract description 31
- 230000004151 fermentation Effects 0.000 title claims abstract description 31
- 238000004062 sedimentation Methods 0.000 claims abstract description 22
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 17
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000003647 oxidation Effects 0.000 claims abstract description 13
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 238000003306 harvesting Methods 0.000 claims abstract description 7
- 239000000706 filtrate Substances 0.000 claims abstract 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 34
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 9
- 239000001569 carbon dioxide Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 238000005262 decarbonization Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000000701 coagulant Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 claims description 4
- 210000003608 fece Anatomy 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 239000010871 livestock manure Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 claims description 3
- 239000003337 fertilizer Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims 1
- 238000012258 culturing Methods 0.000 abstract description 4
- 238000003973 irrigation Methods 0.000 abstract description 2
- 230000002262 irrigation Effects 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 244000144972 livestock Species 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 241000195493 Cryptophyta Species 0.000 description 4
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- 231100000719 pollutant Toxicity 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
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- 238000009395 breeding Methods 0.000 description 3
- 230000001488 breeding effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 244000144977 poultry Species 0.000 description 3
- 239000012028 Fenton's reagent Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 229960004887 ferric hydroxide Drugs 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 238000010672 photosynthesis Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VTEIFHQUZWABDE-UHFFFAOYSA-N 2-(2,5-dimethoxy-4-methylphenyl)-2-methoxyethanamine Chemical compound COC(CN)C1=CC(OC)=C(C)C=C1OC VTEIFHQUZWABDE-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000012531 culture fluid Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 235000019197 fats Nutrition 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
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- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000009304 pastoral farming Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000000243 photosynthetic effect Effects 0.000 description 1
- 238000009374 poultry farming Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002881 soil fertilizer Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
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- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/02—Photobioreactors
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C12M23/00—Constructional details, e.g. recesses, hinges
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- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
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- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
- C12M29/18—External loop; Means for reintroduction of fermented biomass or liquid percolate
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- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
- C12M29/26—Conditioning fluids entering or exiting the reaction vessel
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- C12M47/00—Means for after-treatment of the produced biomass or of the fermentation or metabolic products, e.g. storage of biomass
- C12M47/02—Separating microorganisms from the culture medium; Concentration of biomass
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- 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
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46176—Galvanic cells
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- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a continuous treatment system for treating fermented biogas slurry based on chlorella, which comprises a biogas slurry pretreatment unit, a chlorella culture unit and a chlorella harvesting unit, wherein the biogas slurry pretreatment unit comprises a fermentation tank, a biogas slurry regulating tank, a micro-electrolysis tank, a Fenton oxidation tank, a neutralization sedimentation tank and a decoloration biogas slurry tank, the chlorella culture unit comprises a plurality of tubular photobioreactors, the reactors comprise three feed inlets which are respectively used for inputting the chlorella culture solution, cleaning solution discharged by the decoloration biogas slurry tank and gas, the chlorella harvesting unit comprises a centrifuge, the centrifuge is communicated with a discharge port of the tubular photobioreactor, and chlorella slurry and chlorella purified filtrate are obtained after the centrifuge treatment. The pretreated biogas slurry is used for culturing chlorella, the chlorella photobioreactor can effectively treat fermented biogas slurry, and the treated biogas slurry can meet the water quality standard of farm irrigation by combining with artificial wetland treatment, and the cultured chlorella has remarkable economic value.
Description
Technical Field
The invention relates to the field of waste treatment in the breeding industry, in particular to a continuous treatment system for treating fermentation biogas slurry based on chlorella.
Background
With the rapid development of intensive livestock and poultry breeding in China, the problems of the livestock and poultry breeding farms and the surrounding environment are increasingly prominent as one of the main factors restricting the further development of the livestock industry. In order to prevent environmental pollution, ensure the health of people and livestock, promote the sustainable development of animal husbandry, and make relevant regulations in HJ/T81-2001 technical Specification for pollution control of livestock and poultry farming, livestock and poultry manure is fermented by biogas, biogas residues and biogas slurry are comprehensively utilized as much as possible, and new pollution is avoided.
The waste biogas residue and biogas slurry generated by biogas fermentation can be directly used as soil fertilizer, and the waste biogas residue and biogas slurry can be discharged after a certain treatment due to the fact that the waste biogas residue and biogas slurry contain a large amount of main pollutants such as nitrogen, phosphorus, BOD, COD, feS, SS and heavy metals, or a series of environmental pollution problems such as water eutrophication can be caused.
Chlorella is a green alga which is the earliest isolated and cultivated by human beings, and researches show that the chlorella has the functions of degrading organic pollutants, efficiently absorbing heavy metals, absorbing nitrogen and phosphorus, and the like, has a high growth speed, can convert inorganic carbon (carbon dioxide or carbonate) into carbohydrate by utilizing light energy, has photosynthesis efficiency about 10 times that of general higher plants, and is hopeful to become pioneer species for reducing carbon dioxide emission. The chlorella also contains high-quality nutritive value, has extremely high protein quality, and is rich in fat, vitamins and trace elements, and is a preferable raw material for preparing livestock feed.
Therefore, the fermentation biogas slurry is treated by using the chlorella, so that the safe treatment of the fermentation biogas slurry can be realized through the metabolism of the chlorella, and the economic value can be realized through recycling the algae slurry to process livestock feed. Meanwhile, in combination with the current development situation of the livestock industry in China, the continuous system for treating the fermentation biogas slurry based on the chlorella has wide market utilization prospect in the future.
Disclosure of Invention
The invention aims to provide a continuous treatment system for treating fermentation biogas slurry based on chlorella, which does not cause secondary pollution to the environment and has simple and easy whole treatment process.
The invention provides a continuous system for treating fermentation biogas slurry based on chlorella, which comprises a biogas slurry pretreatment unit, a chlorella culture unit and a chlorella harvesting unit, wherein the structures are connected through pipelines, the biogas slurry pretreatment unit sequentially comprises a fermentation tank, a biogas slurry regulating tank, a micro-electrolysis tank, a Fenton oxidation tank, a neutralization sedimentation tank and a decoloration biogas slurry tank according to the process sequence, the biogas slurry regulating tank is provided with three feed inlets which are respectively communicated with a biogas slurry discharge port of the fermentation tank, an acid tank and a water tank, the neutralization sedimentation tank is provided with two feed inlets which are respectively communicated with the Fenton oxidation tank and a coagulant aid tank, an alkali tank is arranged between the Fenton oxidation tank and the neutralization sedimentation tank, the chlorella culture unit comprises a plurality of tubular photobioreactors, the tubular photobioreactors comprise three feed inlets which are respectively used for inputting chlorella culture liquid, cleaning liquid discharged from the decoloration biogas slurry tank and gas, the chlorella unit comprises a centrifuge, the centrifuge and the filter media are respectively discharged from the centrifuge to a filter chamber (the filter chamber is directly discharged into a wet-cleaning ball filter chamber 10 after the chlorella is subjected to manual wet-cleaning of a filter chamber (the filter chamber is cleaned by the filter chamber) and the filter chamber is directly discharged into a wet-cleaning station 10).
Compared with the prior art, the invention has the beneficial effects that: firstly, the decoloration treatment of the fermented biogas slurry can be realized, so that the influence on the light transmittance of the chlorella tubular photobioreactor due to the too deep color of the biogas slurry is avoided, and the photosynthesis of the chlorella is limited; secondly, the pretreated biogas slurry is used for culturing the chlorella, no additional nutrient salt substances are needed, and the biogas tail gas generated by fermentation is decarbonized (carbon dioxide) to be used as a carbon source for culturing the chlorella, so that the chlorella culture cost is saved; thirdly, when centrifugal concentration is carried out, the chlorella filter is arranged at the liquid outlet of the centrifugal machine, so that the centrifugal concentration effect and the algae slurry recovery efficiency can be improved; fourthly, the chlorella cultivated by utilizing the fermented biogas slurry can be used for feeds, cosmetics and the like, and has remarkable economic value; fifthly, the chlorella photobioreactor can effectively treat fermentation biogas slurry, and further can achieve the ' standard for water quality for farm irrigation ' GB5084-2005 ' through an artificial wetland treatment system, so that the environmental protection benefit is remarkable.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a process flow diagram of a continuous treatment system for treating fermentation biogas slurry based on Chlorella according to the present invention; and
FIG. 2 is a basic construction diagram of a tubular photobioreactor.
The first table shows the pollutant removal effect of different treatment units for fermented biogas slurry.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1, the continuous system for treating fermentation biogas slurry based on chlorella of the invention comprises a biogas slurry pretreatment unit, a chlorella culture unit, an air supply unit and a chlorella harvesting unit, wherein the structures are connected through pipelines.
The biogas slurry pretreatment unit comprises a fermentation tank 1, a biogas slurry regulating tank 2, an acid tank 2-1, a micro-electrolysis tank 3, a Fenton oxidation tank 4, an alkali tank 5-1, a neutralization sedimentation tank 5, a coagulant aid tank 5-2 and a decoloration biogas tank 6, wherein the biogas slurry regulating tank 2 is provided with three feed inlets, one feed inlet is communicated with one discharge outlet of the fermentation tank 1, the other two feed inlets are respectively communicated with the discharge outlets of the acid tank 2-1 and the water tank 2-1, the other two feed inlets are respectively communicated with the feed inlet of the micro-electrolysis tank 3, the micro-electrolysis tank 3 is provided with two discharge outlets, one feed inlet is communicated with the feed inlet of the Fenton oxidation tank 4, the other connecting pipeline is used for discharging solid at the bottom of the tank, the neutralization sedimentation tank 5 is provided with two feed inlets, one feed inlet is communicated with the feed outlet of the Fenton oxidation tank 4, the other feed inlet is communicated with the discharge outlet of the coagulant aid tank 5-2, the alkali tank 5-1 is arranged between the Fenton oxidation tank 4 and the neutralization sedimentation tank 5, and the feed inlet of the sedimentation tank 5 is communicated with the feed inlet of the decoloration tank 6.
The chlorella cultivating unit comprises a tubular photo-bioreactor 7, wherein the tubular photo-bioreactor 7 is provided with three feed inlets which are respectively used for inputting chlorella culture fluid, cleaning fluid discharged from a decoloration biogas slurry tank 6 for storing biogas slurry and gas, the tubular photo-bioreactor 7 is a horizontal reciprocating high-silicon boron glass pipeline, is provided with a circulating pump which has high flow, can continuously work and has no shearing force on algae cells, and is provided with a ventilation and gas control device and the like, and chlorella cultivated by the tubular photo-bioreactor is picked regularly according to the growth period of the chlorella.
The gas supply unit comprises a gas supply device 12, a biogas decarbonization device 11 and a gas flowmeter 13, wherein the biogas decarbonization device 11 is provided with two discharge ports, one discharge port is used for discharging biogas, the other discharge port is communicated with the gas supply device 12, and the gas supply device 12 is communicated with one feed port of the tubular photobioreactor 7 through the gas flowmeter 13.
The chlorella harvesting unit comprises a centrifugal machine 8, wherein the centrifugal machine 8 is communicated with a discharge port of the tubular photobioreactor 7, the chlorella slurry obtained after being treated by the centrifugal machine 8 is fed into a pig farm after being processed, and the purified chlorella liquid is directly discharged into the constructed wetland 10-1 or is discharged into the constructed wetland 10-1 after being partially washed according to the actual requirements of the chlorella liquid.
Wherein, the fermentation tank 1 is provided with a feed inlet and three discharge outlets, the feed inlet is used for conveying pig manure generated by the pig farm 10-2, two discharge outlets are respectively communicated with the biogas slurry regulating tank 2 and the biogas decarbonization equipment 11, and the other discharge outlet is used for discharging biogas residues.
Wherein, the biogas residue solid discharged from the fermentation tank 1 is concentrated and stored, and agricultural fertilizer is prepared by fermentation process, and the iron residue discharged from the micro-electrolysis tank 3 and the neutralization sedimentation tank 5 is concentrated and stored and sent to iron works or blended and manufactured into building materials.
Wherein, the biogas slurry regulating tank 2 and the neutralization sedimentation tank 5 are internally provided with a pH intelligent measuring instrument, according to the related chemical principle, acid needs to be added into the biogas slurry regulating tank 2 and the pH value of the biogas slurry is regulated to be about 3, the wastewater treatment condition of the micro-electrolyzer 3 arranged behind the wastewater is reached, and the following electrochemical reaction occurs after the wastewater contacts with iron carbon:
anode Fe-2e - →Fe 2+ E 0 (Fe 2+ /Fe 3+ )＝-0.44v
Cathode 2H + +2e - →H 2 E 0 (H + /H 2 )＝0.00v
Adding alkali into the neutralization sedimentation tank 5 to adjust the pH value to about 9 so as to lead Fe to be 3+ And possibly Fe 2+ Precipitated as a colloidal form of hydroxide.
Wherein, the micro-electrolysis tank 3 is an iron-carbon contained micro-electrolysis reaction tank, the filler is a contained framework type formed by integrating scrap iron and carbon slag into a whole through high-temperature sintering, and the mass ratio of iron to carbon is 1:1, the added electrolyte is sodium chloride.
Wherein, the coagulant aid added into the neutralization sedimentation tank 5 is polyacrylamide, and the adding mass ratio is preferably 0.05-0.1%.
Wherein, dilute the natural pond liquid through clear water in the natural pond liquid equalizing basin, both volume ratio is 9:1 to 6: 1.
Wherein, the outlet of the centrifugal machine 8 is provided with a chlorella filter 9 for preventing chlorella from losing.
Wherein, part of carbon dioxide required for culturing chlorella in the tubular photobioreactor 7 is from carbon dioxide after biogas tail gas is treated by the biogas decarbonization device 11, and the other part is from a carbon dioxide tank with the purity of 99.99 percent.
When the micro-electrolyzer is used, firstly, the biogas slurry adjusting tank receives fermented biogas slurry, and the purpose of the micro-electrolyzer is to adjust the water quantity on one hand and adjust the pH of the biogas slurry to about 3 on the other hand, so that the condition of wastewater treatment of the micro-electrolyzer arranged afterwards is achieved.
The filler in the iron-carbon micro-electrolysis reactor is integrated iron-carbon, and its function is that under the condition of no power-on and water-supply, fe and C can produce "primary cell" effect, in the micro-electrolysis equipment a countless "primary cells" with potential difference up to 1.2V can be formed, and the external electrolyte or waste water is used as electrolyte, and the oxidation-reduction treatment of waste water is implemented, in which the anode (Fe) is Fe-2e - →Fe 2+ The method comprises the steps of carrying out a first treatment on the surface of the Cathode (C): 2H (H) + +2e - →2[H]→H 2 So that the nascent state H is generated in the treatment process]、Fe 2+ 、Fe 3+ And the like, under the condition of being slightly acidic, the active components can have oxidation-reduction reaction with a plurality of components in the wastewater, so as to degrade organic matters, such as chromophore nitro-NO of some organic matters 2 The nitroso-NO is reduced into amino-NH 2, and the biodegradability of amino organic matters is obviously higher than that of nitro organic matters; the double bonds of some unsaturated chromophores (such as carboxyl-COOH and azo-N=N-) can be opened to destroy chromophores or auxiliary chromophores of colored wastewater, even break chains, so as to achieve the purpose of decoloring; fe produced 2+ Further oxidation to Fe 3+ The hydrates thereof have stronger adsorption-flocculation activity, and particularly, ferrous hydroxide and ferric hydroxide colloid flocculating agents are generated after adding alkali to adjust the pH value (about 9).
Considering that the iron bed can cause 'back color' phenomenon in a short time after decoloring some types of wastewater, and the phenomenon is aggravated to a certain extent by incomplete removal of Fe < 2+ >, a proper oxidant H should be added in addition to thoroughly removing the color-developing matrix in the subsequent treatment process 2 O 2 It is matched with Fe in waste water 2+ And (3) forming a Fenton reagent. The Fenton reagent has extremely strong oxidizing ability because HO is catalyzed by Fe to generate hydroxyl radicals. On the one hand, the method can continuously treat organic wastewater which is difficult to degrade, and on the other hand, fe can be caused to be 2+ Rapidly oxidized to Fe 3+ After that by Fe (OH) 3 The colloidal forms are separated out, the flocculation capacity of the colloidal forms is far higher than that of ferric hydroxide colloid obtained by hydrolysis of common medicaments, and a large amount of tiny particles, metal particles and organic macromolecules dispersed in water can be flocculated. The pH value is adjusted to be more than 9 during neutralization sedimentation,by letting Fe 2+ The meaning of setting the Fenton oxidation tank and the neutralization sedimentation tank is that the full sedimentation is realized.
In addition, the following benefits can be achieved by decolorizing the fermented biogas slurry: firstly, the waste water load can be reduced, the method is suitable for the growth of chlorella, and the reduction of the photosynthetic efficiency of the chlorella due to the overhigh chromaticity is avoided; and secondly, impurities are removed, so that the requirements of recycling and processing livestock feed by using the chlorella algae slurry can be met. Further, the biogas slurry purified by the chlorella is directly discharged into the constructed wetland.
In combination with Table I, after the raw water is diluted in a certain proportion, the total removal rate of main pollutants COD, BOD, kjeldahl nitrogen and TP in the wastewater in the whole treatment system respectively reaches 70.9-72.1%, 73.8-79.0%, 82.4-82.7% and 80.0-90.6%, the concentration of the treated pollutants can reach the 'standard for farm irrigation Water quality GB 5084-2005', and the finally purified clear water can be used for cleaning the colony house and regulating the biogas slurry raw water.
List one
Through the embodiment, the waste water recycling can be realized through the treatment and fermentation of the biogas slurry by the chlorella, and the livestock feed can be manufactured through the recycling and processing of the chlorella slurry, so that a certain economic value is realized.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A continuous treatment system for treating fermentation biogas slurry based on chlorella is characterized by comprising a biogas slurry pretreatment unit, a chlorella culture unit and a chlorella harvesting unit, wherein the structures are connected through pipelines,
the biogas slurry pretreatment unit sequentially comprises a fermentation tank (1), a biogas slurry regulating tank (2), a micro-electrolysis tank (3), a Fenton oxidation tank (4), a neutralization sedimentation tank (5) and a decoloration biogas slurry tank (6) according to the process sequence, wherein the biogas slurry regulating tank is provided with three feed inlets which are respectively communicated with a biogas slurry outlet of the fermentation tank (1), an acid tank (2-1) and a water tank, the neutralization sedimentation tank (5) is provided with two feed inlets which are respectively communicated with the Fenton oxidation tank (4) and a coagulant aid tank (5-2), an alkali tank (5-1) is arranged between the Fenton oxidation tank (4) and the neutralization sedimentation tank (5),
the chlorella culture unit comprises a plurality of tubular photobioreactors (7), the tubular photobioreactors (7) comprise three feed inlets which are respectively used for inputting chlorella culture liquid, cleaning liquid discharged by a decoloration biogas slurry tank and gas,
the biogas slurry is diluted by clear water in the biogas slurry regulating tank (2), and the volume ratio of the biogas slurry to the clear water is 9: 1-6: between the two parts of the two parts 1,
the chlorella harvesting unit comprises a centrifuge (8), the centrifuge (8) is communicated with a discharge port of the tubular photobioreactor (7), chlorella slurry and chlorella purified filtrate are obtained after the treatment of the centrifuge (8), wherein the filtrate is directly discharged to the constructed wetland (10-1) or is discharged into the constructed wetland (10-1) after being used for flushing a colony house,
the outlet of the centrifugal machine (8) is provided with a chlorella filter (9) for preventing chlorella from losing.
2. The continuous treatment system for treating fermented biogas slurry based on chlorella according to claim 1, further comprising a gas supply unit comprising a biogas decarbonization device (11) and a gas supply device (12) for supplying gas to the tubular photobioreactor (7), wherein the biogas decarbonization device (11) is provided with two discharge ports, one of which is for discharging biogas and the other of which is in communication with the gas supply device (12).
3. The continuous treatment system for treating fermentation biogas slurry based on chlorella according to claim 1, wherein the fermentation tank (1) is provided with a feed inlet and three discharge outlets, the feed inlet is used for conveying pig manure produced by a pig farm (10-2), two discharge outlets of the three discharge outlets are respectively communicated with the biogas slurry regulating tank (2) and the biogas decarbonization device (11), and the other discharge outlet is used for discharging biogas residues.
4. The continuous treatment system for treating fermented biogas slurry based on chlorella according to claim 1, wherein the biogas residue solids discharged from the fermentation tank (1) are concentrated and stored for preparing agricultural fertilizer; the iron slag discharged from the micro-electrolysis tank (3) and the neutralization sedimentation tank (5) is concentrated and stored for being used as industrial raw materials.
5. The continuous treatment system for treating fermentation biogas slurry based on chlorella according to claim 1, wherein the biogas slurry regulating tank (2) and the neutralization sedimentation tank (5) contain a pH intelligent measuring instrument, wherein the acid is added into the biogas slurry regulating tank (2) and the pH of the biogas slurry is regulated to be 3, the wastewater treatment condition of a micro-electrolysis tank (3) arranged behind the acid is reached, and alkali is added into the neutralization sedimentation tank (5) to regulate the pH to be 9, so that Fe is obtained 3+ And Fe (Fe) 2+ Precipitated as a colloidal form of hydroxide.
6. The continuous treatment system for treating fermentation biogas slurry based on chlorella according to claim 1, wherein the micro-electrolysis tank (3) is an iron-carbon-containing micro-electrolysis reaction tank, the filler is a containing framework type formed by integrating scrap iron and carbon slag into a whole through high-temperature sintering, and the mass ratio of iron to carbon is 1:1, the added electrolyte is sodium chloride.
7. The continuous treatment system for treating fermentation biogas slurry based on chlorella according to claim 1, wherein the coagulant aid added into the neutralization sedimentation tank (5) is polyacrylamide, and the addition mass ratio is 0.05% -0.1%.
8. The continuous treatment system for treating fermented biogas slurry based on chlorella according to claim 2, wherein the carbon dioxide required for cultivating chlorella in the tubular photobioreactor (7) is partly derived from carbon dioxide after the biogas tail gas is treated by the biogas decarbonization device (11), and partly derived from a carbon dioxide cylinder.
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