CN102653775B - Treatment method for converting urine to resources and energy - Google Patents

Treatment method for converting urine to resources and energy Download PDF

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CN102653775B
CN102653775B CN201210153277.9A CN201210153277A CN102653775B CN 102653775 B CN102653775 B CN 102653775B CN 201210153277 A CN201210153277 A CN 201210153277A CN 102653775 B CN102653775 B CN 102653775B
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urine
algae
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bioreactor
energy
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CN102653775A (en
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靳强
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Shanghai Jiaotong University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

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Abstract

The invention relates to a treatment method for converting urine to resources and energy. The method comprises the following steps that: urine is thrown into a photobioreactor with microalgae inoculated, the microalgae grow fast in the photobioreactor under the effect of the urine, and when the concentrations of the microalgae reach 0.5-50g/L, the microalgae are separated from the photobioreactor and are put into a biogas fermentor to be fermented for 3-45 days to generate biogas, biogas slurry and biogas residues, wherein the biogas is used as energy; the biogas slurry returns to the photobioreactor to be recycled; and the biogas residues are used as organic fertilizers or compound fertilizers. Compared with the prior art, the treatment method has the following advantages: the urine is adopted as the unique nutrient source of the whole system, the whole system can well operate without any other nutrient source, grow the microalgae continuously and stably generate the biogas and the organic fertilizers or compound fertilizers; the urine is taken locally without collection or transportation, does not need to be bought as the unique hand feed of the system and is totally free; and the system has simple structure and low cost and is easy to manufacture and install.

Description

The treatment process of a kind of urine resource utilization and energy
Technical field
The present invention relates to environment, agricultural and energy field, especially relate to the treatment process of a kind of urine resource utilization and energy.
Background technology
Nitrogen (N) and phosphorus (P) are the major reasons that causes lake, river and coastal waters eutrophication phenomenon, are also important agricultural resources simultaneously.From sanitary sewage, remove and reclaim nitrogen, phosphorus, both can reach the object of protection of the environment, can serve as again resource recycling.Generally, nitrogen, phosphorus concentration in sanitary sewage are conventionally lower, directly therefrom reclaim more difficult nor economical, so at present the control techniques of nitrogen, phosphorus in sewage is not mostly recycled,, taking Transformatin as object, be only nitrogen (N by ammonia nitrogen by nitration denitrification technical transform 2) after be directly discharged in atmosphere, phosphorus is as solid refuse processing after mud by biological phosphate-eliminating or chemical precipitation technical transform.Nitrogen in sanitary sewage and phosphorus nutrition material are mainly derived from urine, according to Switzerland's environmental science and federal (the The Swiss Federal Institute for EnvironmentalScience and Technology of the council of technology, EAWAG) statistics, in mankind's urine, nitrogen and phosphorus account for respectively 80% and 50% left and right of nitrogen in sanitary sewage, phosphorus load.But, the volume of urine is less than one of percentage of sanitary sewage cumulative volume, therefore, urine has the feature of the nutritive substances such as rich Nitrogen-and Phosphorus-containing, before urine enters water drain, urine is separated and processed, be equivalent to from highly enriched solution, to extracting and separating nutritive substance, can significantly reduce costs.
Patent CN102167434A discloses a kind of chemical process that a kind of urine is processed and nutritive element reclaims, and refers in particular to a kind of method that reclaims nitrogen in urine, phosphorus.First, after fresh urine collecting, should naturally add a cover storage, according to season and envrionment temperature difference, within approximately 10 days, left and right pH can rise to 9, and storage process is as the criterion with pH monitoring, reaches the operation that more than 9 can reclaim nitrogen, phosphorus; Sampling detects NH 4 +-N and PO 4 3--P concentration, n (Mg): n (P): n (N) in molar ratio=add at 1.3: 1: 1 Na 2hPO 4and MgCl 2, control stirring velocity is 100r/min, the reaction times is 10min, precipitates after 1 hour and can separation of supernatant obtain magnesium ammonium phosphate (MAP is called again struvite) throw out.According to contained NH after urine hydrolysis 4 +-N and PO 4 3--P concentration, adds phosphoric acid salt and magnesium salts by certain mol proportion, by reasonable control reaction conditions, nitrogen, phosphorus is reclaimed to greatest extent with the sedimentary form of MAP, and nitrogen, phosphorus are all significantly reduced, and nitrogen, phosphorous recovery are up to 95% left and right.Although the method has not only been processed urine and has also been reclaimed nitrogen and phosphorus,, the method has following shortcoming: need to add phosphoric acid salt and magnesium salts, this obviously needs cost; Obtaining is the inorganics precipitation of carrying other composition in urine, and easy precipitation means and is difficult to by farm crop or plant utilization.
Summary of the invention
Object of the present invention is exactly to provide in order to overcome the defect that above-mentioned prior art exists that a kind of efficiency is high, the treatment process of urine resource utilization and energy simply and easily.
Object of the present invention can be achieved through the following technical solutions: the treatment process of a kind of urine resource utilization and energy, it is characterized in that, the method comprises the following steps: urine is dropped into inoculation to be had in the bioreactor of micro-algae, micro-algae Fast Growth under the effect of sunlight, air, water and urine in this bioreactor, in the time that the concentration of micro-algae reaches 0.5g/L～50g/L, micro-algae is separated from bioreactor, and be placed in methane fermentor, fermentation 3-45 days, forms methane, natural pond liquid and natural pond slag.
The amount that described urine drops in bioreactor is: the volume fraction of stablizing cultivation stage interpolation urine in micro-algae is 1/50～1/2000, the volume fraction of adding urine in micro-algae domestication stage increases gradually according to the quickening of micro algae growth speed, but is finally no more than the volume fraction while stablizing cultivation stage.
Micro-algae in described bioreactor is directly taken from all kinds of algae-containing water bodies, or directly buys algae kind.
Water in described bioreactor is pure water, tap water, rainwater or river.
Described micro-algae from bioreactor, separate adopt centrifugal, filter or flocculation in any separation means or other separate mode.
Described micro-algae is separated the traditional supersonic method of rear employing microalgae cell is carried out after fragmentation from bioreactor, then enters in methane fermentor, also can adopt other breaking methods.
The temperature of described methane fermentor is 35～40 DEG C, and pH value scope gets 6.8～7.5, also can under the natural condition in the four seasons, carry out, and does not carry out temperature and pH value and controls, and can reduce like this manual intervention and reduce controlling cost of temperature and pH value.
Described natural pond liquid is back to bioreactor, and as micro algae growth extra-nutrition material, and self is also purified.
Described natural pond slag, as fertilizer, is composite organic-inorganic fertilizer when urine is excessive, promotes farm crop or other plant-growth.
Described biogas all directly enters gas-holder, or isolates CO by gas separator 2after input again gas-holder, isolated CO 2pass into bioreactor and increase CO in water 2concentration, promote micro algae growth.
Put into suitable quantity of water in bioreactor after, inoculate micro-algae, adopt urine naturally under irradiation, it is tamed and being cultivated at sunlight.Urine is a kind of sewage, enter water body and can cause serious pollution, but it contains the needed abundant and comprehensive nutritive substance of micro algae growth.Under the irradiation naturally of sunlight, micro-algae absorbs the carbonic acid gas (CO of inorganic carbon form in atmosphere 2), be self organic matter by photosynthesis by its conversion and propagation.Urine is unique nutrition source of whole system, and in the time adding urine, urine can promote the growth of micro-algae, and biomass can increase sharply, thereby completes efficiently the process that light energy conversion is biomass energy.In the time that biomass reaches finite concentration, from water, isolate micro-algae, and it is carried out to cytoclasis, then carry out biogas fermentation processing.In order to reduce running cost, also can not carry out cytoclasis, micro-algae directly carries out methane fermentor after separating.Fermentation Products from Biogas Generator is divided into three parts: biogas, natural pond liquid, natural pond slag.In the liquid of natural pond, contain low molecule organic carbon and abundant nutritive substance, reflux and be supplemented in bioreactor, promote micro algae growth.The main component of biogas is methane (CH 4) and CO 2, wherein CO 2from biogas, separate and pass in bioreactor, to increase the concentration of inorganic carbon source in water, promote the growth of micro-algae.Residue biogas main component after separation is methane, passes into gas-holder for subsequent use as renewable energy source, thereby realizes the object of energy.In order to reduce costs, also can not separate biogas, all pass into gas-holder for subsequent use as renewable energy source, thereby realize the object of energy.In the slag of natural pond, contain abundant low molecule organic matter and the required abundant nutritive substance of plant-growth, can make fertilizer and use, in the time that urine is excessive, can do inorganic compoiste fertilizer use, thereby realize the object of resource utilization.In whole process, urine has realized purifying treatment as sewage simultaneously.
Compared with prior art, the present invention has the following advantages:
(1) provide a kind of high efficiency method of processing urine sewage, can be for the processing of toilet of household waste water, public lavatory waste water and aquaculture waste water, after popularization, can greatly reduce the production load of sanitary sewage disposal factory deoxidation dephosphorization, and significantly reduce the degree of body eutrophication and the possibility that wawter bloom occurs.
(2) not only process urine, and converted it into efficient fertilizer or inorganic compoiste fertilizer, thereby realized the object of sewage recycling.
(3) also produced biogas processing in urine process, biogas is a kind of renewable energy source, from biogas separable go out CO 2cultivate for micro-algae, biogas removes CO 2rear CH 4content higher than general biogas, unit volume can be worth highly, therefore the present invention also simultaneously has realized the object of urine energy in high quality.Also can think, under the effect of urine, whole technique has realized sun power and has transformed micro-algal biomass energy, then is converted into the chemical energy of the methane form being easy to use by biomass energy, only has two step conversions, simple efficient and easy to use.
(4) urine is owing to containing abundant and comprehensive nutritive substance, and the form that nutritive substance is easy to absorb with micro-algae exists, thereby greatly promoted the growth of micro-algae, increased substantially sun power and be converted into the effciency of energy transfer of chemical energy.And, in urine, contain phosphoric acid salt, be good pH buffer reagent, can prevent biogas fermentation time, pH value excessively reduces, and maintains the optimal ph of methanogen metabolism, improves its production efficiency.Therefore, urine is the efficient promotor of a kind of good micro algae growth, is also a kind of good system feeding.
(5) urine is the unique nutritive substance source of whole system, can move well without other any nutrition source (comprising any any type of biomass that contain nutritive substance and derivative fertile), micro-algae that grows constantly, and stably produce biogas and fertilizer or composite fertilizer.Urine results from family, public lavatory or cultivation factory, and material-taking on-site, does not need to collect, and does not need transport, as the unique hand feed of system, does not also need to buy, completely free.And system is required sunlight and CO in addition 2without manually adding, completely free, therefore, in fact whole system has formed small-size energy chemical plant and the sewage work of zero raw materials cost.
(6) in urine excessive nutritive substance after biogas fermentation stage processing, with natural pond slag be not a simple mixed relationship, but formed fertilizer efficiency more superior there is synergistic composite relation, more effectively promote the growth of plant.
(7) technique, bioreactor provides unique micro-algae of raw material for methane fermentor, methane fermentor provides natural pond liquid and biogas for bioreactor, having strengthened again micro-algae cultivates, bioreactor has been processed waste liquid and the waste gas of methane fermentor simultaneously, thereby internal system has formed from coupling mechanism.From system outside, whole system has the charging of a urine sewage and two useful energy and fertilizer discharging, does not have other new pollution to produce.
(8) whole system is very simple, and material requested is with low cost, is easy to manufacture and install, can be within the family, especially in peasant household, promote the use of in limit, public lavatory or cultivation factory.When operation, can not need manual intervention except adding simply urine, do not need manually to add any inorganics and organism (comprising any type of biomass and the derivative fertilizer thereof that contain nutritive substance) yet, thereby remove the manpower of collecting required material from, also removed the fund of the required material of purchase system from.
(9) the present invention adopts urine as the unique nutritive substance source of whole system, because of its comprehensive nutrition, does not need to add other materials, cost-saving, simple to operate.And after the present invention adopts urine to react in bioreactor, the product of gained, as the raw material of methane fermentor, is produced the new energy and resource, has also processed sewage urine simultaneously.
Brief description of the drawings
Fig. 1 is process route chart of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, technological process of the present invention is as follows:
(1) inoculation of micro-algae: micro-algae extensively exists in water body, inoculates micro-algae and can directly take from all kinds of algae-containing water bodies, also can directly buy algae kind.In bioreactor 1, inoculate micro-concentration of algae and do not limit;
(2) domestication of micro-algae and cultivation: the domestication of micro-algae and cultivation complete in bioreactor 1.Micro algae growth needs sunlight, CO 2and H 2o, sunlight adopts the sunlight under natural condition, H 2o can be any type of water (comprising pure water, tap water, rainwater and river).Find out CO from Fig. 1 process route chart 2inorganic carbon, the CO separating from atmosphere and biogas 2, due to the CO in biogas 2come from micro-algae self biogas fermentation, therefore atmosphere is micro-algae domestication and cultivates required CO 2unique final source.CO 2can pass through air aeration, biogas CO 2the mode of aeration and natural disturbance, realizes airborne CO 2in dissolved water and for micro-algae, utilize.Sunlight and CO 2without manually adding, and completely free, supplement the water entering in bioreactor and be mainly used in micro-algae assimilation and spontaneous evaporation, can automatically add.Find out from Fig. 1 process route chart, the natural pond liquid that required nutritive substance comes from urine and is back to bioreactor from methane fermentor is tamed and cultivated to micro-algae, but the nutritive substance in the liquid of natural pond all derives from micro-algae, therefore, urine is that domestication and unique nutritive substance of cultivating micro-algae are finally originated.And, also find out from Fig. 1 process route chart, urine is also the unique nutritive substance of whole process system source, can process sustainedly and stably urine, cultivates micro-algae and produce fertilizer or composite fertilizer, biogas without other any nutrition source (comprising any type of biomass and the derivative fertilizer thereof that contain nutritive substance) whole system.In the time that urine is excessive, natural pond slag is inorganic compoiste fertilizer.In bioreactor, stablizing cultivation stage, to add that the volume fraction of urine is respectively be 1/50～1/2000, and the volume fraction that the domestication stage is added urine increases gradually according to micro algae growth speed, but finally should not exceed the volume fraction while stablizing cultivation stage.
Urine has unique effect in micro-algae cultivation and marsh gas fermentation processes.Urine is filtered and is formed through tissue, is aseptic liquid, does not therefore have the biotic intrusion to micro-algae compared with other nutrition source and causes the problem of micro-algae underproduction.Secondly, urine contains 100 lot of trace active substances, inorganic substance have sodium, potassium, chlorine, vitriol, phosphoric acid salt, ammonium salt, calcium ion etc., organic substance mainly contains urea, uric acid, urokinase isoreactivity material, therefore urine can provide comprehensive nutritive substance for the growth of micro-algae, and these nutritive substances have and be easy to the character that micro-algae absorbs, this is that other nutrition source (comprising xylogen and derivative fertilizer thereof) is not available.The 3rd, the suitable carbon-nitrogen ratio of biogas fermentation is with 10～30: 1, and the carbon-nitrogen ratio of micro-algae is generally greater than 60: 1, can regulate easily micro-algae at the C/N in biogas fermentation stage ratio by changing urine addition, makes biogas operating mode in optimum regime.The 4th, when urine addition takes more than micro algae growth, unnecessary urine nutritive substance was discharged with natural pond slag in the biogas fermentation stage, and now in fact natural pond slag has formed the higher inorganic compoiste fertilizer of fertility.Nutritive substance excessive in urine after biogas fermentation stage processing, with natural pond slag be not a simple mixed relationship, but formed fertilizer efficiency more superior there is synergistic composite relation, more effectively promote the growth of plant.The 5th, phosphorus from urine hydrochlorate has soda acid pooling feature, and this important operation factor pH value that is conducive to maintain biogas fermentation has positive effect.In a word, urine has the above-mentioned many peculiar properties that are different from other nutrition source, thereby make urine compared with other nutrition source, all can significantly improve biochemical efficiency at micro-algae cultivation stage and biogas fermentation stage, improve the output of micro-algae, biogas and fertilizer or inorganic compoiste fertilizer.
(3) micro-algae separates 3: when micro-concentration of algae is during at 0.5g/L～50g/L, micro-algae is separated from water, and be placed in methane fermentor.Can adopt centrifugal, filter and flocculation in any separation means.
(4) micro-algae fragmentation 4: micro-algae fragmentation is equivalent to the pre-treatment of biogas fermentation, object is the micro-algae of deactivation crushing microalgae cells, thereby reduces the residence time of micro-algae in methane fermentor, improves the production efficiency of biogas fermentation.Adopt traditional supersonic method to carry out fragmentation to microalgae cell.In order to reduce running cost, micro-algae can not carry out break process, directly enters methane fermentor 2.
(5) biogas fermentation: carry out in a traditional way biogas fermentation.In order to obtain higher biogas yield, temperature range is got 35～40 DEG C, and pH value scope gets 6.8～7.5.Also can under the natural condition in the four seasons, carry out, not carry out temperature and pH value and control, can reduce like this manual intervention and reduce controlling cost of temperature and pH value.The residence time of micro-algae in methane fermentor is between 3～45 days, and tunning is divided into three parts: biogas, natural pond liquid, natural pond slag.Natural pond liquid is back to bioreactor, be micro algae growth extra-nutrition material, and self is also purified.Natural pond slag, as fertilizer, is composite organic-inorganic fertilizer when urine is excessive, promotes farm crop or other plant-growth.
(6) gas delivery: the mode of taking traditional transformation to separate, biogas is inputted in gas separator 5 and separated, from biogas, isolate CO 2, passing into bioreactor 1 increases CO in water 2concentration, promote micro algae growth.Also can adopt unseparated mode, the biogas after anaerobism all directly enters gas-holder 6, although the CO in biogas 2do not re-used by the micro-algae in bioreactor, but greatly reduced fixed cost and the running cost of whole system.
Embodiment 1
For a method for urine resource utilization and energy, the method comprises the following steps: (1) puts into 1000m in bioreactor 3water, gets 1m 3general green river is inoculated micro-algae, pours in bioreactor (2) into and gets 200L urine and be added into bio-reactor, under naturally the irradiating of sunlight, it is tamed, and increases 200L urine every day, within 10 days, has tamed afterwards.After this by every day 2L urine stable be added into bioreactor, enter stable cultivation stage, now biomass is 5g/L.(3) adopt the way of filtering to isolate micro-algae, after ultrasonic disruption, drop into methane fermentor.(4) micro-algae was 10 days methane fermentor residence time, and 40% is transformed into biogas, and 30% changes natural pond liquid, and 30% becomes natural pond slag.It is for subsequent use that biogas enters gas-holder, and natural pond liquid is back to bioreactor, and natural pond slag as fertilizer sources is for subsequent use.The present embodiment implementation result: completed the processing of 2L urine sewage every day, do not need any nutrition source beyond urine realized that micro-algae is cultivated and biogas fermentation from coupling process, convert solar energy into methane energy, realized efficiently urine processing, energy manufacture and three targets of organic fertilizer production simultaneously.
Embodiment 2
For a method for urine resource utilization and energy, the method comprises the following steps: (1) puts into 1m in bioreactor 3water, gets the general green river of 1L and inoculates micro-algae, pours in bioreactor.(2) get 50mL urine and be added into bio-reactor, naturally it being tamed under irradiation of sunlight, increase 50mL urine every day, within 10 days, tamed afterwards.After this by every day 500mL urine stable be added into bioreactor, enter stable cultivation stage, now biomass is 0.5g/L.(3) adopt the way of filtering to isolate micro-algae, after ultrasonic disruption, drop into methane fermentor.(4) micro-algae was 3 days methane fermentor residence time, and 40% is transformed into biogas, and 40% changes natural pond liquid, and 20% becomes natural pond slag.It is for subsequent use that biogas enters gas-holder, and natural pond liquid is back to bioreactor, and natural pond slag as fertilizer sources is for subsequent use.The present embodiment implementation result: completed the processing of 500mL urine sewage every day, do not need any nutrition source beyond urine realized that micro-algae is cultivated and biogas fermentation from coupling process, convert solar energy into methane energy, realized efficiently urine processing, organic fertilizer production and the energy simultaneously and manufactured three targets.
Embodiment 3
For a method for urine resource utilization and energy, the method comprises the following steps: (1) puts into 5m in bioreactor 3water, buys chlorella (Chlorella), after spreading cultivation, is seeded in bioreactor.(2) get 10L urine and be added into bio-reactor, sunlight naturally irradiate under it is carried out to hyperplasia cultivation, increase 10L urine every day, after 10 days, complete.After this by every day 100L urine stable be added into bioreactor, enter stable cultivation stage, now biomass is 50g/L.(3) adopt the way of filtering to isolate micro-algae, directly drop into methane fermentor.(4) micro-algae was 45 days methane fermentor residence time, and 50% is transformed into biogas, and 30% changes natural pond liquid, and 20% becomes natural pond slag.It is for subsequent use that biogas enters gas-holder, and natural pond liquid is back to bioreactor, and natural pond slag as fertilizer sources is for subsequent use.The present embodiment implementation result: completed the processing of 100L urine sewage every day, do not need any nutrition source beyond urine realized that micro-algae is cultivated and biogas fermentation from coupling process, convert solar energy into methane energy, realized efficiently urine processing, energy manufacture and efficient inorganic organic composite fertilizer simultaneously and produced three targets.

Claims (8)

1. the treatment process of a urine resource utilization and energy; it is characterized in that; the method comprises the following steps: urine is dropped into inoculation to be had in the bioreactor of micro-algae; micro-algae Fast Growth under the effect of urine in this bioreactor; in the time that the concentration of micro-algae reaches 0.5g/L～50g/L, micro-algae is separated from bioreactor, and be placed in methane fermentor; fermentation 3-45 days, forms methane, natural pond liquid and natural pond slag;
Described biogas all directly enters gas-holder, or isolates CO by gas separator 2after input again gas-holder, isolated CO 2pass into bioreactor and increase CO in water 2concentration, promote micro algae growth;
Described natural pond slag, as fertilizer, is composite organic-inorganic fertilizer when urine is excessive, promotes farm crop or other plant-growth.
2. the treatment process of a kind of urine resource utilization according to claim 1 and energy, it is characterized in that, the amount that described urine drops in bioreactor is: the volume fraction of stablizing cultivation stage interpolation urine in micro-algae is 1/50～1/2000, the volume fraction of adding urine in micro-algae domestication stage increases gradually according to the quickening of micro algae growth speed, but is finally no more than the volume fraction while stablizing cultivation stage.
3. the treatment process of a kind of urine resource utilization according to claim 1 and energy, is characterized in that, the micro-algae in described bioreactor is directly taken from all kinds of algae-containing water bodies, or directly buys algae kind.
4. the treatment process of a kind of urine resource utilization according to claim 1 and energy, is characterized in that, in described bioreactor, is provided with water, and this water is pure water, tap water, rainwater or river.
5. the treatment process of a kind of urine resource utilization according to claim 1 and energy, is characterized in that, described micro-algae from bioreactor, separate adopt centrifugal, filter or flocculation in any separation means.
6. the treatment process of a kind of urine resource utilization according to claim 1 and energy, it is characterized in that, described micro-algae is separated the traditional supersonic method of rear employing microalgae cell is carried out after fragmentation from bioreactor, then enters in methane fermentor.
7. the treatment process of a kind of urine resource utilization according to claim 1 and energy, is characterized in that, the temperature of described methane fermentor is 35～40 DEG C, and pH value scope gets 6.8～7.5.
8. the treatment process of a kind of urine resource utilization according to claim 1 and energy, is characterized in that, described natural pond liquid is back to bioreactor, and as micro algae growth extra-nutrition material, and self is also purified.
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CN107973623A (en) * 2017-11-22 2018-05-01 南昌大学 Multi-form microalgae bio-fertilizer and preparation method thereof
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