CN114045311A - Method for preparing biogas from citrus pulp - Google Patents
Method for preparing biogas from citrus pulp Download PDFInfo
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- CN114045311A CN114045311A CN202111242940.8A CN202111242940A CN114045311A CN 114045311 A CN114045311 A CN 114045311A CN 202111242940 A CN202111242940 A CN 202111242940A CN 114045311 A CN114045311 A CN 114045311A
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- 235000020971 citrus fruits Nutrition 0.000 title claims abstract description 64
- 241000207199 Citrus Species 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims description 31
- 241001672694 Citrus reticulata Species 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000003895 organic fertilizer Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- 229940088598 enzyme Drugs 0.000 claims description 12
- 108090000790 Enzymes Proteins 0.000 claims description 11
- 102000004190 Enzymes Human genes 0.000 claims description 11
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 238000006386 neutralization reaction Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 4
- 108010059892 Cellulase Proteins 0.000 claims description 4
- 101710121765 Endo-1,4-beta-xylanase Proteins 0.000 claims description 4
- 108010059820 Polygalacturonase Proteins 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 229940106157 cellulase Drugs 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 108010093305 exopolygalacturonase Proteins 0.000 claims description 4
- 235000019253 formic acid Nutrition 0.000 claims description 4
- 229940059442 hemicellulase Drugs 0.000 claims description 4
- 108010002430 hemicellulase Proteins 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000010802 sludge Substances 0.000 claims description 4
- 235000011054 acetic acid Nutrition 0.000 claims description 3
- 235000011167 hydrochloric acid Nutrition 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 238000007171 acid catalysis Methods 0.000 claims description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M sodium bicarbonate Substances [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000000855 fermentation Methods 0.000 abstract description 12
- 230000004151 fermentation Effects 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000010865 sewage Substances 0.000 abstract description 3
- 230000003301 hydrolyzing effect Effects 0.000 abstract description 2
- 235000013372 meat Nutrition 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 9
- 230000014759 maintenance of location Effects 0.000 description 9
- 238000005086 pumping Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 235000019990 fruit wine Nutrition 0.000 description 4
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000003337 fertilizer Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 244000269722 Thea sinensis Species 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000002075 anti-alcohol Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 208000004880 Polyuria Diseases 0.000 description 1
- 244000046146 Pueraria lobata Species 0.000 description 1
- 235000010575 Pueraria lobata Nutrition 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 244000111146 Sonchus arvensis Species 0.000 description 1
- 235000008132 Sonchus arvensis ssp. uliginosus Nutrition 0.000 description 1
- 241000282887 Suidae Species 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 235000019658 bitter taste Nutrition 0.000 description 1
- 235000013532 brandy Nutrition 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000035619 diuresis Effects 0.000 description 1
- 235000015177 dried meat Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 235000012907 honey Nutrition 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 235000015205 orange juice Nutrition 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 235000013555 soy sauce Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 235000019640 taste Nutrition 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 231100000765 toxin Toxicity 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 235000014101 wine Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
- C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
- C12P5/023—Methane
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F5/00—Fertilisers from distillery wastes, molasses, vinasses, sugar plant or similar wastes or residues, e.g. from waste originating from industrial processing of raw material of agricultural origin or derived products thereof
- C05F5/002—Solid waste from mechanical processing of material, e.g. seed coats, olive pits, almond shells, fruit residue, rice hulls
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
-
- 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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- Organic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Zoology (AREA)
- Wood Science & Technology (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biotechnology (AREA)
- Biochemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Microbiology (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Mechanical Engineering (AREA)
- Botany (AREA)
- Environmental & Geological Engineering (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a method for preparing biogas from citrus pulp, which is characterized in that the citrus pulp is subjected to hydrolytic fermentation to prepare the biogas, the treatment time is short, the purpose of treating a large amount of citrus pulp in a short time can be met, distributed energy can be obtained, a high-efficiency anaerobic reactor can treat high-concentration organic sewage when the citrus pulp is not treated and is idle, the method has important practical and practical significance, and the problem that the citrus pulp produced in a large amount in a short time needs to be put into large-scale fermentation equipment, and the citrus peel industry chain cannot be driven to utilize the pulp in economic benefit is solved.
Description
The technical field is as follows:
the invention relates to the technical field of environment-friendly and renewable distributed energy, in particular to a method for preparing biogas from citrus pulp.
Background art:
the citrus pulp related by the invention is from the remainder of the citrus reticulata branch planted in the Jiangmen area and used for producing dried orange peel after removing the peel. The dried orange peel is a geographical marking product in the new meeting and the four-meeting area of the river, has high medicinal value, but a large amount of citrus pulp is left after the peel is extracted, and about 4-6 ten thousand tons per year. The citrus pulp is sour and astringent in taste and is rarely eaten, and is discarded as waste for a long time, so that serious environmental pollution is caused. Some researchers have explored high-value utilization approaches for this purpose. For example, patent CN 108260699A, CN 108185336 a discloses a method for post-treatment of waste citrus pulp, which comprises separating citrus pulp from citrus juice, soaking honey to prepare citrus jam and citrus dried meat, and oven-drying citrus fruit to obtain medicinal materials. Patent CN 104286735A prepares citrus pulp into jam. The patent CN 106387736A adopts an advanced cooling vacuum dehydration technology, retains the original nutritive value of fresh vegetables and fruits, and combines the characteristics of recovery in water with health tea, thereby preparing the tea cake. CN 110272784B discloses a bathroom cleaner containing chazu orange juice and a preparation method thereof; the patent CN 110655430A discloses a method for preparing an organic fertilizer by using citrus pulp residues, wherein 0.2-1% of a leaven, 0.2-1% of a fermentation starter, 10-89% of citrus pulp residues of dried orange peel and the balance of water are fermented to produce a biological organic fertilizer which can be used for plants and has the function of a foliar fertilizer. The invention discloses a liquid feed for fattening pigs, which is prepared by fermenting citrus reticulata pulp and bean dregs through a compound bacterium-enzyme preparation liquid. Patent CN 103131587B discloses a slag-free emission production method of bitter-free citrus pulp fruit wine. The method comprises the steps of selecting citrus fruits, peeling, washing, crushing, liquefying, removing seeds and debitterizing to obtain citrus pulp juice, and preparing the citrus pulp fruit wine without bitter taste through the working procedures of fermentation and the like; the pericarp is used for preparing pericarpium Citri Tangerinae and green and red shreds; drying the seeds in the sun for oil pressing; the wine lees are used for preparing crude yeast, and the production without residue discharge is realized. Patent CN 106138353A discloses a production method of Xinhui citrus antialcoholic enzyme, which comprises the following steps: taking fresh Xinhui citrus reticulata pulp, squeezing juice, filling into a fermentation tank, respectively inoculating Xinhui citrus reticulata enzyme flora, adding kudzu root, plum and sow thistle, and fermenting twice to prepare the anti-alcoholic beverage with the effects of clearing heat and removing toxicity, and expelling toxin and inducing diuresis. CN 112852575A relates to a preparation method of citrus reticulata blanco, which comprises the following steps:
(1) pretreatment before fermentation; (2) pre-fermentation; (3) fermenting after separating the residue and the juice; (4) steaming brandy by a liquid method, adding processed Xinhui mandarin orange leaves into the white spirit, and performing purification for 30 days; (5) the post-treatment comprises filtering, sterilizing, bottling, filtering with one of diatomite, thin plate and microporous membrane, and bottling. The patent CN 111137873A takes Xinhui citrus pulp as a raw material, and a novel carbon material is prepared by a step-by-step carbonization method under the auxiliary action of ammonium bicarbonate. Patent CN 106262685 a discloses a method for making soy sauce with citrus pulp. Patent CN 108947648B discloses a fermentation fertilizer using edible fungus dregs and tangerine peel meat dregs as raw materials. However, in the preparation of foods such as ferment, preserved fruit and fruit wine, the sanitary requirement is strict in the process of taking the citrus peel, the requirement on the freshness of the citrus peel is high, the market accommodation scale of products such as ferment and fruit wine is limited, the fermentation time for preparing fertilizer is long, the citrus peel produced in a large amount in a short time needs to be put into large-scale fermentation equipment, and the citrus peel industry chain cannot be driven to utilize the citrus peel in economic benefit.
The invention content is as follows:
the invention aims to provide a method for preparing biogas from citrus pulp, wherein the citrus pulp is subjected to hydrolytic fermentation to prepare the biogas, the treatment time is short, the purpose of treating a large amount of citrus pulp in a short time can be met, distributed energy can be obtained, and a high-efficiency anaerobic reactor can treat high-concentration organic sewage when the citrus pulp is not treated and is idle, so that the method has important practical and practical significance, and the problems that a large amount of citrus pulp produced in a short time needs to be put into large-scale fermentation equipment, and a citrus peel industry chain cannot be driven to utilize the pulp in economic benefit are solved.
The invention is realized by the following technical scheme:
a method for preparing biogas from citrus pulp comprises the following steps: the citrus pulp is conveyed into a reaction kettle by a spiral feeder, heated to 198-ion 202 ℃ under the stirring condition and reacted for a period of time, then solid-liquid separation is carried out by a filter press or a horizontal spiral centrifuge, alkali is added into the liquid for neutralization until the pH value is 6.5-8.5, then the liquid is pumped into an efficient anaerobic reactor for producing biogas, effluent is discharged after aerobic biological treatment and physicochemical treatment, and a small amount of residues are sold as organic fertilizer raw materials or directly buried.
The citrus pulp can be hydrolyzed at the higher temperature of 198-202 ℃ because the citrus pulp contains acid, and preferably, no more than 3.0 percent of acid or enzyme is also added into the reaction kettle; the acid is more than one of sulfuric acid, hydrochloric acid, acetic acid, formic acid and oxalic acid; the enzyme is a mixture of pectinase, hemicellulase, xylanase and cellulase, and the total enzyme activity is more than or equal to 10000U/g; reacting for 0.5-3h at 80-200 ℃ under the condition of acid catalysis; reacting for 24-72h at 25-37 ℃ under the condition of adding enzyme.
The citrus pulp is obtained from the remainder of citrus reticulata branch planted in the Jiangmen area and used for producing dried orange peel after removing peel.
Preferably, the stirring speed is 50-150 rpm.
Preferably, the water content of the solid part after solid-liquid separation is 25-45%.
The alkali for neutralization is CaO, Ca (OH)2、NaOH、Na2CO3、NaHCO3More than one of them.
The anaerobic reactor is selected from one of an up-flow anaerobic sludge bed reactor (UASB), an anaerobic expanded granular sludge bed reactor (EGSB), an internal circulation anaerobic reactor (IC) and a double-circulation high-efficiency anaerobic reactor, and the organic load is 2-25 kg/Nm3The residence time is 6-12 h.
The invention has the following beneficial effects: can effectively utilize mandarin orange meat, turn into the energy with it, and handle and take time for short, the handling capacity is big, and the marsh gas of production is splendid distributed energy, and produces the anaerobic reactor of marsh gas and still can be used to handle high concentration organic waste water in non mandarin orange meat output season, and anaerobic reactor still can be used to sewage treatment in mandarin orange meat slack season, and equipment input output is higher, has important realistic meaning.
The specific implementation mode is as follows:
the following is a further description of the invention and is not intended to be limiting.
Example 1
Conveying the mandarin orange meat to a reaction kettle by a screw feeder, heating to 200 deg.C, stirring at 50rpm for 3 hr, performing solid-liquid separation by a filter press after flash evaporation and cooling, neutralizing the liquid with NaOH to pH6.5, pumping into UASB to produce biogas with an operation load of 2kg/Nm3D, the retention time is 6h, and the biogas yield is 90Nm3One ton of citrus pulp. Effluent is discharged after aerobic biological treatment and physicochemical treatmentAnd a small amount of residues are sold as organic fertilizer raw materials or directly buried for treatment.
Example 2
Conveying the mandarin orange meat to a reaction kettle by a screw feeder, adding 3 wt% acetic acid, heating to 130 deg.C, stirring at 100rpm for 0.5 hr, cooling by a heat exchanger, performing solid-liquid separation by a filter press, adding Na into the liquid2CO3Neutralizing to pH8.5, pumping EGSB to produce marsh gas with operation load of 15kg/Nm3D, the retention time is 12h, and the biogas yield is 94Nm3One ton of citrus pulp. The effluent is discharged after reaching standards through aerobic biological treatment and physicochemical treatment, and a small amount of residues are sold as organic fertilizer raw materials or directly buried.
Example 3
Conveying the mandarin orange meat to a reaction kettle by a spiral feeder, adding 1.5 wt% sulfuric acid, heating to 80 deg.C, stirring at 150rpm for reaction for 3h, performing solid-liquid separation by a filter press after flash evaporation and cooling, adding CaO into the liquid for neutralization to pH6.5, pumping into an IC reactor to produce biogas with an operation load of 25kg/Nm3D, the retention time is 8h, and the biogas yield is 65Nm3One ton of citrus pulp. The effluent is discharged after reaching standards through aerobic biological treatment and physicochemical treatment, and a small amount of residues are sold as organic fertilizer raw materials or directly buried.
Example 4
Conveying mandarin orange meat to a reaction kettle by a screw feeder, adding 0.5 wt% hydrochloric acid, heating to 170 deg.C, stirring at 50rpm for 1 hr, performing solid-liquid separation by a filter press after flash evaporation and cooling, neutralizing the liquid with NaOH to pH7.0, pumping into UASB to produce biogas with a running load of 5kg/Nm3D, the retention time is 12h, and the biogas yield is 80Nm3One ton of citrus pulp. The effluent is discharged after reaching the standard through aerobic biological treatment and physicochemical treatment, and a small amount of residues are sold as organic fertilizer raw materials or directly buried.
Example 5
Conveying the mandarin orange meat to a reaction kettle by a screw feeder, adding 2 wt% of oxalic acid, heating to 145 ℃, stirring at 80rpm for reaction for 2h, performing solid-liquid separation by a filter press after flash evaporation and temperature reduction, and adding Ca (OH) into the liquid2Neutralizing to pH7.5, pumping into a dual-circulation anaerobic reactor to produce biogas with an operation load of 18kg/Nm3D, the retention time is 10h, and the biogas yield is 90Nm3One ton of citrus pulp. The effluent is discharged after reaching standards through aerobic biological treatment and physicochemical treatment, and a small amount of residues are sold as organic fertilizer raw materials or directly buried.
Example 6
Conveying the mandarin orange meat into a reaction kettle by using a spiral feeder, adding 1.2 wt% of formic acid, heating to 170 ℃, stirring at 70rpm for reaction for 2.5h, performing solid-liquid separation by using a filter press after flash evaporation and temperature reduction, adding NaOH into the liquid for neutralization to pH7.5, pumping the liquid into an IC reactor to produce biogas, wherein the operation load is 20kg/Nm3D, the retention time is 8h, and the biogas yield is 97Nm3One ton of citrus pulp. The effluent is discharged after reaching standards through aerobic biological treatment and physicochemical treatment, and a small amount of residues are sold as organic fertilizer raw materials or directly buried.
Example 7
Conveying the mandarin orange meat to a reaction kettle by a screw feeder, adding 0.8 wt% of formic acid and 0.5 wt% of sulfuric acid, heating to 125 deg.C, stirring at 120rpm for reaction for 0.8h, performing solid-liquid separation by a filter press after flash evaporation and temperature reduction, adding Ca (OH) into the liquid2Neutralized to pH4.5 and then NaHCO was added3When the pH value is 8.0, pumping UASB to produce biogas, and the operation load is 13kg/Nm3D, the retention time is 10h, and the biogas yield is 80Nm3One ton of citrus pulp. Effluent is discharged after reaching standards through aerobic biological treatment and physicochemical treatment, and a small amount of residue has the water content of 45 percent and is sold as an organic fertilizer raw material or directly buried.
Example 8
Conveying the citrus pulp into a reaction kettle by using a spiral feeder, heating to 37 ℃, adding a mixture of pectinase, hemicellulase, xylanase and cellulase (the mass ratio is 1:1:1:1), stirring at 150rpm for reaction for 72 hours, adjusting the pH of liquid to 7.5 after solid-liquid separation, pumping into an IC reactor to produce biogas, and controlling the operation load to be 25kg/Nm3D, the retention time is 6h, and the biogas yield is 81Nm3One ton of citrus pulp. The effluent is discharged after reaching the standard through aerobic biological treatment and physicochemical treatment, and the residue with the water content of 25 percent is sold as an organic fertilizer raw material or directly buried.
Example 9
Conveying the citrus pulp into a reaction kettle by using a spiral feeder, heating to 25 ℃, adding a mixture of pectinase, hemicellulase, xylanase and cellulase (the mass ratio is 0.5:0.5:1:1), regulating the total enzyme activity to 50000U/g, stirring at 50rpm for reaction for 24 hours, after solid-liquid separation, regulating the pH of liquid to 6.5, pumping the liquid into a UASB reactor to produce biogas, and controlling the operation load to 10kg/Nm3D, the retention time is 10h, and the biogas yield is 67Nm3One ton of citrus pulp. The effluent is discharged after reaching the standard through aerobic biological treatment and physicochemical treatment, and the residue with 35 percent of water content is sold as an organic fertilizer raw material or directly buried.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (7)
1. The method for preparing the biogas from the citrus pulp is characterized by comprising the following steps: the citrus pulp is conveyed into a reaction kettle by a spiral feeder, heated to 198-ion 202 ℃ under the stirring condition and reacted for a period of time, then solid-liquid separation is carried out by a filter press or a horizontal spiral centrifuge, alkali is added into the liquid for neutralization until the pH value is 6.5-8.5, then the liquid is pumped into an efficient anaerobic reactor for producing biogas, effluent is discharged after aerobic biological treatment and physicochemical treatment, and a small amount of residues are sold as organic fertilizer raw materials or directly buried.
2. The method for preparing biogas from citrus pulp according to claim 1, wherein not more than 3.0 wt% of acid or enzyme is further added to the reaction kettle; the acid is more than one of sulfuric acid, hydrochloric acid, acetic acid, formic acid and oxalic acid; the enzyme is a mixture of pectinase, hemicellulase, xylanase and cellulase, and the total enzyme activity is more than or equal to 10000U/g; reacting for 0.5-3h at 80-200 ℃ under the condition of acid catalysis; reacting for 24-72h at 25-37 ℃ under the condition of adding enzyme.
3. The method for preparing biogas from citrus pulp according to claim 1 or 2, wherein the citrus pulp is obtained from the remainder of citrus reticulata branch for producing dried orange peel, which is planted in the Jiangmen area, after peeling.
4. The method for preparing biogas from citrus pulp according to claim 1 or 2, characterized in that the stirring speed is 50-150 rpm.
5. The method for preparing biogas from citrus pulp according to claim 1 or 2, wherein the moisture content of the solid part after the solid-liquid separation is 25% to 45%.
6. Method for producing biogas from citrus pulp according to claim 1 or 2, characterized in that the alkali used for neutralization is CaO, Ca (OH)2、NaOH、Na2CO3、NaHCO3More than one of them.
7. The method for preparing biogas from citrus pulp according to claim 1 or 2, wherein the anaerobic reactor is selected from one of an upflow anaerobic sludge bed reactor, an anaerobic expanded granular sludge bed reactor, an internal circulation anaerobic reactor and a double circulation high efficiency anaerobic reactor, and the organic load is 2-25 kg/Nm3The residence time is 6-12 h.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111242940.8A CN114045311A (en) | 2021-10-25 | 2021-10-25 | Method for preparing biogas from citrus pulp |
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