CN103819053B - Struvite precipitation coupling microdisk electrode is utilized to carry out the method for natural pond liquid and marsh gas purifying - Google Patents

Struvite precipitation coupling microdisk electrode is utilized to carry out the method for natural pond liquid and marsh gas purifying Download PDF

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CN103819053B
CN103819053B CN201410062868.4A CN201410062868A CN103819053B CN 103819053 B CN103819053 B CN 103819053B CN 201410062868 A CN201410062868 A CN 201410062868A CN 103819053 B CN103819053 B CN 103819053B
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liquid
natural pond
algae
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microdisk electrode
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CN103819053A (en
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王文国
潘科
汤晓玉
祝其丽
胡启春
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Biogas Institute of Ministry of Agriculture
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Biogas Institute of Ministry of Agriculture
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

The invention discloses a kind of method utilizing struvite precipitation coupling microdisk electrode to carry out natural pond liquid and marsh gas purifying, comprise the steps: NH in the natural pond liquid after a, mensuration breeding wastewater anaerobically fermenting 4 +, Mg 2+and PO 4 3-concentration; B, in the liquid of natural pond, add Mg 2+and PO 4 3-generation struvite precipitates, and add-on is with NH 4 +clearance reach 70%-90% for standard; After c, struvite precipitation, natural separation solid and liquid, be used for microdisk electrode in scope liquid pH value being adjusted to applicable micro algae growth; After inoculating micro-algae in d, liquid after adjust ph, pass into the biogas after desulfurization and cultivate; Carry out solid-liquid separation after e, cultivation, Collection utilization is carried out to micro-algae frond.The present invention utilizes the ammonia nitrogen concentration in the liquid of struvite precipitation technology reduction natural pond, promotes the transparency of natural pond liquid to be more conducive to the growth of micro-algae, utilizes micro-algae to CO in biogas 2with the nutritive salt such as nitrogen phosphorus in the liquid of natural pond purification natural pond liquid and biogas, biogas utilization can be promoted and be worth, reduce biogas engineering running cost.

Description

Struvite precipitation coupling microdisk electrode is utilized to carry out the method for natural pond liquid and marsh gas purifying
Technical field
The invention belongs to bioenergy to develop and field of environment protection, be specifically related to a kind of method utilizing struvite crystallization coupling microdisk electrode to carry out natural pond liquid and marsh gas purifying.
Background technology
Biogas technology is the Main Means that China's livestock and poultry farm carries out offal treatment, recycling, but the problem of environmental pollution of natural pond liquid and the low problem of grade of methane remain the subject matter of restriction biogas industry development.Still containing nutrient salts such as a large amount of nitrogen phosphorus in the liquid of natural pond, direct discharge can cause environmental pollution, causes surface water body eutrophication, and may impact underground water.Biogas is a kind of mixed gas, except containing methane (CH 4) outward, also containing certain carbonic acid gas (CO 2), steam, nitrogen (N 2) etc. gas, wherein CO 2too high levels can affect suitability and the calorific value of biogas, CO 2removal be the important content of marsh gas purifying.
Disposal at present for natural pond liquid mainly contains " also field ", " naturally processing ", " through engineering approaches process " isotype.Natural pond liquid also field needs a large amount of soil, and is difficult to solve the contradiction between the continuity of natural pond liquid generation and the seasonality of agricultural use." naturally process " and refer to that methods such as utilizing oxidation pond, artificial swamp, land percolation carries out natural pond liquid process, although investment comparatively economizes, less energy consumption, operational and administrative expenses is low, also needs a large amount of soil, by the impact in season, and has the risk of polluted underground water." through engineering approaches process " refers to and utilizes physics, chemistry or the biological means such as aeration, stripping, ion-exchange, membrane filtration to carry out process up to standard to natural pond liquid, although take up an area few, and wide adaptability, but investment is large, energy consumption is high, and running expense is high, and seldom carries out recycling.
At present for CO in biogas 2the method removed mainly contains high-pressure washing, chemical absorption, pressure-variable adsorption and membrane separation technique etc., and cost is all higher.
In addition, micro-algae energy technology is a kind of newer biomass energy technology, because micro algae growth speed is fast, water content in harvest is short, photosynthetic utilising efficiency is high, and unit surface production capacity rate high, generally believe it is very competitive biomass energy technology both at home and abroad at present, development potentiality is huge.Such as, China Patent No. " 201310347109.8 " discloses a kind of natural pond liquid ecological purification method based on both culturing microalgae, and publication date is 2013-11-20, comprises the steps: the liquid pre-treatment of (1) natural pond; (2) domestication of the micro-algae of autotrophic type is cultivated, and obtains the algae strain that can grow fast in the liquid of 70%-100% natural pond; (3) preparation of seed liquor; (4) micro algae growth coupling natural pond liquid purifying method: the algae kind after domestication is inoculated in Race-way photobioreactor after spreading cultivation cultivates, adopt the Method means that Semi-continuous cultivation method and feed supplement feeding culture etc. are optimized, obtain the chlorella biomass of high-density growth, purify natural pond liquid simultaneously; (5) the biochemical broken wall of microalgae cell: microalgae cell is introduced biochemical broken wall pond, throws in fresh-water fishes, obtains the algae slurry of broken wall; (6) microalgae cell recycle natural pond liquid.
But the consumption of the nutrient salts such as nitrogen phosphorus a large amount of in microdisk electrode and carbon source can bring huge running cost, reducing toxigenic capacity is the important factor promoting algae energy development.To utilize in the liquid of natural pond the nutritive salt such as abundant nitrogen phosphorus to cultivate micro-algae and be considered to feasible, but be unfavorable for micro algae growth due to the ammonia nitrogen of the high density contained in the liquid of natural pond, suspended matters a large amount of in the liquid of natural pond causes transparency to reduce, and is unfavorable for the photosynthesis of micro-algae.Diluting natural pond liquid with clear water is method conventional at present, but the method can consume a large amount of water resourcess.
Summary of the invention
The object of the invention is to the problems referred to above overcoming prior art existence, a kind of method utilizing struvite precipitation coupling microdisk electrode to carry out natural pond liquid and marsh gas purifying is provided.The present invention utilizes the ammonia nitrogen concentration in the liquid of struvite precipitation technology reduction natural pond, promotes the transparency of natural pond liquid to be more conducive to the growth of micro-algae, utilizes micro-algae to CO in biogas 2with the nutritive salt such as nitrogen phosphorus in the liquid of natural pond purification natural pond liquid and biogas, biogas utilization can be promoted and be worth, reduce biogas engineering running cost.
For achieving the above object, the technical solution used in the present invention is as follows:
Utilize struvite precipitation coupling microdisk electrode to carry out a method for natural pond liquid and marsh gas purifying, it is characterized in that, comprise the steps:
NH in natural pond liquid after a, mensuration breeding wastewater anaerobically fermenting 4 +, Mg 2+and PO 4 3-concentration;
B, in the liquid of natural pond, add Mg 2+and PO 4 3-generation struvite precipitates, and add-on is with NH 4 +clearance reach 70%-90% for standard;
After c, struvite precipitation, natural separation solid and liquid, be used for microdisk electrode in scope liquid pH value being adjusted to applicable micro algae growth;
After inoculating micro-algae in d, liquid after adjust ph, pass into the biogas after desulfurization and cultivate;
Carry out solid-liquid separation after e, cultivation, Collection utilization is carried out to micro-algae frond.
In described step a, the natural pond liquid for struvite precipitation is after Anaerobic Digestion, and not pretreated fresh natural pond liquid.
In described step a, breeding wastewater natural pond liquid after marsh-gas fermentation tank anaerobic digestion enters in equalizing tank, measures NH in the liquid of natural pond 4 +, Mg 2+and PO 4 3-concentration.
In described step b, after natural pond liquid enters agitated pool, according to the ionic concn of mensuration and the biological characteristics of micro-algae algae kind, in the liquid of natural pond, add Mg 2+and PO 4 3-, adjust ph, then stir, the struvite of generation is precipitated.
In described step b, in the liquid of natural pond, add Mg 2+and PO 4 3-, make NH 4 +, Mg 2+and PO 4 3-molar ratio reach 1:1.2:1, pH regulator between 9.0-10.0, then stirs 10-20min with the speed of 50-150rpm, reacts the NH that terminates in rear supernatant liquor 4 +concentration controls within 100mg/L.
In described step b, open agitated pool gate after reaction terminates, reaction solution is drained into settling tank, from equalizing tank, puts into next batch natural pond liquid enter agitated pool, process next batch natural pond liquid.
In described step b, the Mg added 2+derive from magnesium salts MgCl 2, Mg (OH) 2, MgCO 3in one, PO 4 3-mainly come from sylvite KH 2pO 4, K 2hPO 4in one.
In described step c, the solid of generation and liquid mixture flow into water collecting basin through the supernatants after precipitation of 1-3 hour from the other end and store in rectangular sedimentation tank, and the solid of precipitation is used as fertilizer with after pump extraction drying.
In described step c, the described liquid pH value for microdisk electrode regulates between 6.5-7.5.
In described steps d, the liquid after adjust ph is injected into microdisk electrode device from water collecting basin, inoculates micro-algae and biogas after passing into desulfurization after airtight incubator is cultivated in microdisk electrode device, and culture cycle is 10-20d.
In described steps d, micro-algae of inoculation is have micro-algae of tolerance to natural pond liquid and biogas after process, as Chlorophyta chlorella ( chlorella), grid algae ( scenedesmus), Botryococcus braunii ( botryococcus) etc.
Employing the invention has the advantages that:
One, the present invention is according to the NH in the liquid of natural pond 4 +, PO 3-, Mg 2+concentration and the demand of micro algae growth suitably add PO 3-, Mg 2+, make it produce struvite precipitation under high ph conditions, to reduce high NH 4 +on the impact of microalgae biomass accumulation; And the suspended substance utilizing the throwing out of the precipitation of struvite to remove in the liquid of natural pond increases natural pond liquid transparence, be conducive to microalgae biomass accumulation; Utilize in micro algae growth process and the nitrogen phosphorus in struvite supernatants after precipitation is cut down to the absorption of nitrogen phosphorus; Utilize in micro algae growth process CO in biogas 2fixing biogas to be purified.
Two, the present invention can recycle the nitrogen phosphor resource in the liquid of natural pond greatly, and fixes the CO in biogas while the liquid of purification natural pond 2to reach the object of marsh gas purifying, whole process can reduce the discharge of breeding wastewater anaerobically fermenting after stain thing, improves taste and the added value of biogas utilization, has higher economic benefit and environmental benefit.
Three, in step a of the present invention, natural pond liquid for struvite precipitation is after Anaerobic Digestion, and not pretreated fresh natural pond liquid, the advantage had is that anaerobic process can kill the microorganism being unfavorable for micro algae growth in breeding wastewater stoste, and remove a large amount of organism, be conducive to the growth of micro-algae; The struvite precipitation process that is directly used in not pretreated fresh natural pond liquid can reduce natural pond liquid aerial open-assembly time and enter natural pond liquid to reduce the biology harmful to micro algae growth, and can save processing cost.
Four, in step b of the present invention, in the liquid of natural pond, Mg is added 2+and PO 4 3-, make NH 4 +, Mg 2+and PO 4 3-molar ratio reach 1:1.2:1, adopt the advantage of this specified proportion to be the efficiency that struvite precipitates can be made to reach maximization under this ratio condition, to remove more NH 4 +, and can make to retain in reacted liquid a certain amount of phosphorus and magnesium to meet the demand of micro algae growth; PH regulator is between 9.0-10.0, and the advantage had is the formation that this pH scope is suitable for struvite precipitation, and too low meeting makes reaction insufficient, is unfavorable for NH 4 +removal, too high meeting makes NH 4 +with NH 3gas form volatilizees, and is unfavorable for the recovery of nitrogen, pollutes the environment again, and cost can be made to increase; Stir 10-20min with the speed of 50-150rpm again, the advantage had is the carrying out this stirring velocity and time being conducive to precipitin reaction, and the too low or time is too short can affect sedimentation effect, and too high or long meeting makes running cost increase; React the NH terminated in rear supernatant liquor 4 +concentration controls within 100mg/L, and the advantage had is at this NH 4 +under concentration conditions, micro-algae can keep good growth conditions, and removes NH further by the absorption of micro-algae self 4 +with other pollutents, excessive concentration can produce micro algae growth and suppress, and is unfavorable for the purification further to natural pond liquid and biogas.
Five, in step c of the present invention, the solid produced and liquid mixture flow into water collecting basin through the supernatants after precipitation of 1-3 hour from the other end and store in rectangular sedimentation tank, the solid of precipitation is extracted out dry rear as fertilizer with pump, the advantage had automatically can carry out solid-liquid separation by leaving standstill of for some time after struvite precipitation, adopt the cost not needing the rectangular sedimentation tank of power to be conducive to saving solid-liquid separation process, solid is used as fertilizer can increase added value.
Six, in step c of the present invention, the described liquid pH value for microdisk electrode regulates between 6.5-7.5, and the advantage had is that micro-algae has good growth conditions in this pH interval, the too high or too low growth being unfavorable for micro-algae.
Seven, in steps d of the present invention, liquid after adjust ph is injected into microdisk electrode device from water collecting basin, micro-algae is inoculated and biogas after passing into desulfurization after airtight incubator is cultivated in microdisk electrode device, culture cycle is 10-20d, the advantage had is that the growth of micro-algae in this time interval can proceed to the stage of stable development from logarithmic phase, continue to cultivate and be unfavorable for the acquisition of microalgae biomass and the decontamination effect improving of water quality, and running cost can be made to increase.
Eight, in described steps d, micro-algae of inoculation is have micro-algae of tolerance to natural pond liquid and biogas after process, as Chlorophyta chlorella ( chlorella), grid algae ( scenedesmus), Botryococcus braunii ( botryococcus) etc., the advantage had is still containing a certain amount of ammonia nitrogen in the natural pond liquid after struvite precipitation process, and salinity can be made to increase, still containing part sulphur in biogas after desulfurization, the growth of most micro-algae algae kind can be affected, select the algae kind of tolerance to be conducive to obtaining best micro algae growth state, better purification natural pond liquid and biogas, obtain higher added value.
Nine, in step b of the present invention, after natural pond liquid enters agitated pool, according to the ionic concn of mensuration and the biological characteristics of micro-algae algae kind, in the liquid of natural pond, Mg is added 2+and PO 4 3-, adjust ph, then stir, the struvite of generation is precipitated, and the advantage had adds Mg 2+and PO 4 3-make the NH in the liquid of natural pond 4 +, Mg 2+and PO 4 3-mole number reaches suitable ratio, improves deposition efficiency, to remove more NH 4 +, meet the growth demand of micro-algae.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
Embodiment
Embodiment 1
Utilize struvite precipitation coupling microdisk electrode to carry out a method for natural pond liquid and marsh gas purifying, mainly comprise following step:
(1) NH in the natural pond liquid after breeding wastewater anaerobically fermenting is measured 4 +, Mg 2+and PO 4 3-concentration;
(2) in agitated pool, suitable Mg is added according to the biological characteristics of the ionic concn measured and micro-algae algae kind 2+and PO 4 3-, add-on is with NH 4 +clearance reach 70%-90% for standard, adjust ph, stir, make the struvite precipitation of generation completely;
(3), after step (2) struvite precipitin reaction terminates, solid and liquid mixture flow into settling tank, make solid and liquid natural separation, and solid is used for slow release fertilizer; Liquid flows into water collecting basin from settling tank and stores, and is injected in microdisk electrode device for microdisk electrode after in the scope that pH value is adjusted to applicable micro algae growth;
(4) in microdisk electrode device, micro-algae is inoculated and biogas after passing into desulfurization after airtight incubator is cultivated.Give vent to anger after dehydration for combustion power generation, life energy etc.;
(5) carry out solid-liquid separation by after cultivation for some time, collect micro-algae frond, frond is used for the extraction of biofuel, and liquid is back to plant or discharge.
For struvite precipitation natural pond liquid for flow out from anaerobic digestion device, not pretreated fresh natural pond liquid, the suspended substance directly produced in the throwing out and standing separation process removing natural pond liquid that magnesium ammonium phosphate (struvite) precipitates by reaction is enhanced the transparency, and the ammonia-nitrogen content reduced in the liquid of natural pond, be beneficial to the growth of micro-algae.
The Mg added described in step (2) 2+derive from magnesium salts MgCl 2, Mg (OH) 2, MgCO 3in one, PO 4 3-mainly come from sylvite KH 2pO 4, K 2hPO 4in one, make NH 4 +, Mg 2+and PO 4 3-ratio reach 1:1.2:1, pH regulator, between 9.0-10.0, reacts the NH that terminates in rear supernatant liquor 4 +concentration controls within 100mg/L.Micro algae growth needs these three kinds of elements of nitrogen, phosphorus, magnesium, and in the liquid stoste of natural pond, ammonia-nitrogen content exceeds the tolerance of micro-algae, needs struvite precipitin reaction to remove, but NH in the liquid of natural pond 4 +, Mg 2+and PO 4 3-the precipitin reaction that ratio produces can not make NH 4 +be cut in suitable scope, so need to add Mg 2+and PO 4 3-, Mg 2+and PO 4 3-add-on is with NH 4 +clearance reach 70%-90% for standard, N, P, Mg now in liquid can satisfy the demand.
The stirring reaction time in step (2) is 10-20min, and stirring velocity is 50-150rpm.
Regulate between 6.5-7.5 for the liquid pH value of microdisk electrode described in step (3).
Be have micro-algae of certain tolerance to natural pond liquid and biogas after process for purifying micro-algae of natural pond liquid and biogas described in step (4), as Chlorophyta chlorella ( chlorella), grid algae ( scenedesmus), Botryococcus braunii ( botryococcus) etc.
Microdisk electrode device in step (3) and (4) is airtight ascending manner photoreactor.
Embodiment 2
As shown in Fig. 1, according to technical scheme provided by the invention, utilize struvite crystallization coupling microdisk electrode to carry out the method for natural pond liquid and marsh gas purifying, mainly comprise following processing step:
Step 101: breeding wastewater natural pond liquid after marsh-gas fermentation tank anaerobic digestion enters in equalizing tank, and measures NH in the liquid of natural pond 4 +, Mg 2+and PO 4 3-concentration.
In this step, the effect of equalizing tank is mainly to regulate natural pond liquid to enter the amount of agitated pool, and natural pond liquid residence time in equalizing tank is shorter.
Step 102: the biological characteristics according to the ionic concn measured and selected micro-algae algae kind adds a certain amount of Mg 2+and PO 4 3-struvite is precipitated, and add-on is with NH 4 +clearance reach 70%-90% for standard, N, P, Mg content after reaction in liquid is applicable to micro algae growth, and adjust ph is between 9.0-10.0, stirring 10-20min is carried out with the speed of 50-150rpm, agitated pool gate is opened after reaction terminates, reaction solution is drained into settling tank, from equalizing tank, puts into next batch natural pond liquid enter agitated pool, process next batch natural pond liquid.
The reaction occurred in step 102 is as follows:
Mg 2++ NH 4 ++ PO 4 3-+ 6H 2O → MgNH 4PO 4·6H 2O↓
The Mg added in this step 2+from MgCl 2, Mg (OH) 2, MgCO 3in one, PO 4 3-come from sylvite KH 2pO 4, K 2hPO 4in one, utilize NaOH adjust ph.
Step 103: the solid that step 102 produces and liquid mixture flow into water collecting basin through the supernatants after precipitation of 1-3 hour from the other end and store in rectangular sedimentation tank, the solid of precipitation is used as fertilizer with after pump extraction drying.
Step 104: be injected into after the natural pond liquid adjust ph after the process in water collecting basin in ascending manner photoreactor, inoculates micro-algae algae kind, and the biogas passed into after airtight through desulfurization carries out microdisk electrode.
Micro-algae algae kind used in this step be Chlorophyta chlorella ( chlorella), grid algae ( scenedesmus), Botryococcus braunii ( botryococcus) in one.PH is transferred between 6.5-7.5.
Step 105: the biogas through micro algae culturing device process is used for life, producting energy, generating etc. through dehydration afterfire.
Step 106: cultivate the micro-algae reaching harvesting time in photoreactor after solid-liquid separation, frond is used for the extraction of biofuel, micro-algae albumen.
The microdisk electrode cycle in this step is 10-20d.
Embodiment 3
The present embodiment natural pond used liquid is that Wastewater from Pig Farm is greater than the natural pond liquid of 1 month anaerobically fermenting through the residence time, utilizes the NH in the liquid of National Standard Method mensuration natural pond 4 +concentration is 522mg/L, Mg 2+concentration is 29mg/L, PO 4 3-concentration is 101mg/L, and natural pond liquid transparency is 6cm.37.5g KH is added in the agitated pool of 100L 2pO 4, MgCl 26H 2o 68.2g, stirring and dissolving, regulates pH to 9.5 with NaOH, and open the valve being arranged in bottom after stirring 10min with the stirring velocity of 100rpm and make reaction solution flow into the standing 2h of settling tank, supernatant liquor is put into water collecting basin, and the transparency of natural pond liquid reaches more than 30cm.After regulating pH to 7.0 with HCl, the natural pond liquid in water collecting basin is transferred in ascending manner photoreactor, inoculates a chlorella of this laboratory screening, the biogas after airtight rear access desulfurization, biogas air inlet CO 2concentration 36-40%, CH 4concentration 58-63%.Give vent to anger CO after discolour silica gel dehydration 2concentration is 5-12%, CH 4concentration is 80-85%.Continue cultivation after 10 days, the chlorella of inoculation reaches harvesting time, liquid and frond is taken out, adopts centrifugal mode to collect the extraction of frond for grease, and in remaining liq, ammonia nitrogen is less than 50mg/L, TP and is less than 2mg/L and reaches livestock breeding wastewater emission standard.
Embodiment 4
Utilize struvite precipitation coupling microdisk electrode to carry out a method for natural pond liquid and marsh gas purifying, comprise the steps:
NH in natural pond liquid after a, mensuration breeding wastewater anaerobically fermenting 4 +, Mg 2+and PO 4 3-concentration;
B, in the liquid of natural pond, add Mg 2+and PO 4 3-generation struvite precipitates, and add-on is with NH 4 +clearance reach 70%-90% for standard;
After c, struvite precipitation, natural separation solid and liquid, be used for microdisk electrode in scope liquid pH value being adjusted to applicable micro algae growth;
After inoculating micro-algae in d, liquid after adjust ph, pass into the biogas after desulfurization and cultivate;
Carry out solid-liquid separation after e, cultivation, Collection utilization is carried out to micro-algae frond.
In described step a, the natural pond liquid for struvite precipitation is after Anaerobic Digestion, and not pretreated fresh natural pond liquid.
In described step a, breeding wastewater natural pond liquid after marsh-gas fermentation tank anaerobic digestion enters in equalizing tank, measures NH in the liquid of natural pond 4 +, Mg 2+and PO 4 3-concentration.
In described step b, after natural pond liquid enters agitated pool, according to the ionic concn of mensuration and the biological characteristics of micro-algae algae kind, in the liquid of natural pond, add Mg 2+and PO 4 3-, adjust ph, then stir, the struvite of generation is precipitated.
In described step b, in the liquid of natural pond, add Mg 2+and PO 4 3-, make NH 4 +, Mg 2+and PO 4 3-molar ratio reach 1:1.2:1, pH regulator between 9.0-10.0, then stirs 10-20min with the speed of 50-150rpm, reacts the NH that terminates in rear supernatant liquor 4 +concentration controls within 100mg/L.
In described step b, open agitated pool gate after reaction terminates, reaction solution is drained into settling tank, from equalizing tank, puts into next batch natural pond liquid enter agitated pool, process next batch natural pond liquid.
In described step b, the Mg added 2+derive from magnesium salts MgCl 2, Mg (OH) 2, MgCO 3in one, PO 4 3-mainly come from sylvite KH 2pO 4, K 2hPO 4in one.
In described step c, the solid of generation and liquid mixture flow into water collecting basin through the supernatants after precipitation of 1-3 hour from the other end and store in rectangular sedimentation tank, and the solid of precipitation is used as fertilizer with after pump extraction drying.
In described step c, the described liquid pH value for microdisk electrode regulates between 6.5-7.5.
In described steps d, the liquid after adjust ph is injected into microdisk electrode device from water collecting basin, inoculates micro-algae and biogas after passing into desulfurization after airtight incubator is cultivated in microdisk electrode device, and culture cycle is 10-20d.
In described steps d, micro-algae of inoculation is have micro-algae of tolerance to natural pond liquid and biogas after process, as Chlorophyta chlorella ( chlorella), grid algae ( scenedesmus), Botryococcus braunii ( botryococcus) etc.
Embodiment 5
The present embodiment and above-described embodiment are substantially identical, and the key distinction is:
In described step b, in the liquid of natural pond, add Mg 2+and PO 4 3-, make NH 4 +, Mg 2+and PO 4 3-molar ratio reach 1:1.2:1, pH regulator to 9.0, then stirs 10min with the speed of 50rpm, reacts the NH that terminates in rear supernatant liquor 4 +concentration controls within 100mg/L.
In described step c, the solid of generation and liquid mixture flow into water collecting basin through the supernatants after precipitation of 1 hour from the other end and store in rectangular sedimentation tank, and the solid of precipitation is used as fertilizer with after pump extraction drying.
In described step c, the described liquid pH value for microdisk electrode regulates 6.5.
In described steps d, the liquid after adjust ph is injected into microdisk electrode device from water collecting basin, inoculates micro-algae and biogas after passing into desulfurization after airtight incubator is cultivated in microdisk electrode device, and culture cycle is 10d.
Embodiment 6
The present embodiment and above-described embodiment are substantially identical, and the key distinction is:
In described step b, in the liquid of natural pond, add Mg 2+and PO 4 3-, make NH 4 +, Mg 2+and PO 4 3-molar ratio reach 1:1.2:1, pH regulator to 10.0, then stirs 20min with the speed of 150rpm, reacts the NH that terminates in rear supernatant liquor 4 +concentration controls at 90mg/L.
In described step c, the solid of generation and liquid mixture flow into water collecting basin through the supernatants after precipitation of 3 hours from the other end and store in rectangular sedimentation tank, and the solid of precipitation is used as fertilizer with after pump extraction drying.
In described step c, the described liquid pH value for microdisk electrode is adjusted to 7.5.
In described steps d, the liquid after adjust ph is injected into microdisk electrode device from water collecting basin, inoculates micro-algae and biogas after passing into desulfurization after airtight incubator is cultivated in microdisk electrode device, and culture cycle is 20d.
Embodiment 7
The present embodiment and above-described embodiment are substantially identical, and the key distinction is:
In described step b, in the liquid of natural pond, add Mg 2+and PO 4 3-, make NH 4 +, Mg 2+and PO 4 3-molar ratio reach 1:1.2:1, pH regulator to 9.5, then stirs 15min with the speed of 100rpm, reacts the NH that terminates in rear supernatant liquor 4 +concentration controls within 60mg/L.
In described step c, the solid of generation and liquid mixture flow into water collecting basin through the supernatants after precipitation of 2 hours from the other end and store in rectangular sedimentation tank, and the solid of precipitation is used as fertilizer with after pump extraction drying.
In described step c, the described liquid pH value for microdisk electrode is adjusted to 7.0.
In described steps d, the liquid after adjust ph is injected into microdisk electrode device from water collecting basin, inoculates micro-algae and biogas after passing into desulfurization after airtight incubator is cultivated in microdisk electrode device, and culture cycle is 15d.
Above specific embodiments of the invention are described, it will be appreciated that, the present invention is not limited to above-mentioned particular implementation, and those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (10)

1. utilize struvite precipitation coupling microdisk electrode to carry out a method for natural pond liquid and marsh gas purifying, it is characterized in that, comprise the steps:
NH in natural pond liquid after a, mensuration breeding wastewater anaerobically fermenting 4 +, Mg 2+and PO 4 3-concentration;
B, in the liquid of natural pond, add Mg 2+and PO 4 3-generation struvite precipitates, and add-on is with NH 4 +clearance reach 70%-90% for standard;
After c, struvite precipitation, natural separation solid and liquid, be used for microdisk electrode in scope liquid pH value being adjusted to applicable micro algae growth;
After inoculating micro-algae in d, liquid after adjust ph, pass into the biogas after desulfurization and cultivate;
Carry out solid-liquid separation after e, cultivation, Collection utilization is carried out to micro-algae frond.
2. the method utilizing struvite precipitation coupling microdisk electrode to carry out natural pond liquid and marsh gas purifying according to claim 1, it is characterized in that: in described step a, natural pond liquid for struvite precipitation is after Anaerobic Digestion, and not pretreated fresh natural pond liquid.
3. the method utilizing struvite precipitation coupling microdisk electrode to carry out natural pond liquid and marsh gas purifying according to claim 1 and 2, it is characterized in that: in described step a, breeding wastewater natural pond liquid after marsh-gas fermentation tank anaerobic digestion enters in equalizing tank, measures NH in the liquid of natural pond 4 +, Mg 2+and PO 4 3-concentration.
4. the method utilizing struvite precipitation coupling microdisk electrode to carry out natural pond liquid and marsh gas purifying according to claim 3, it is characterized in that: in described step b, after natural pond liquid enters agitated pool, according to the ionic concn of mensuration and the biological characteristics of micro-algae algae kind, in the liquid of natural pond, add Mg 2+and PO 4 3-, adjust ph, then stir, the struvite of generation is precipitated.
5. the method utilizing struvite precipitation coupling microdisk electrode to carry out natural pond liquid and marsh gas purifying according to claim 4, is characterized in that: in described step b, in the liquid of natural pond, adds Mg 2+and PO 4 3-, make NH 4 +, Mg 2+and PO 4 3-molar ratio reach 1:1.2:1, pH regulator between 9.0-10.0, then stirs 10-20min with the speed of 50-150rpm, reacts the NH that terminates in rear supernatant liquor 4 +concentration controls within 100mg/L.
6. the struvite precipitation coupling microdisk electrode that utilizes according to claim 4 or 5 carries out the method for natural pond liquid and marsh gas purifying, it is characterized in that: in described step b, agitated pool gate is opened after reaction terminates, reaction solution is drained into settling tank, from equalizing tank, put into next batch natural pond liquid enter agitated pool, process next batch natural pond liquid.
7. the method utilizing struvite precipitation coupling microdisk electrode to carry out natural pond liquid and marsh gas purifying according to claim 6, is characterized in that: in described step b, the Mg added 2+derive from magnesium salts MgCl 2, Mg (OH) 2, MgCO 3in one, PO 4 3-mainly come from sylvite KH 2pO 4, K 2hPO 4in one.
8. the struvite precipitation coupling microdisk electrode that utilizes according to claim 1,2,4,5 or 7 carries out the method for natural pond liquid and marsh gas purifying, it is characterized in that: in described step c, the solid produced and liquid mixture flow into water collecting basin through the supernatants after precipitation of 1-3 hour from the other end and store in rectangular sedimentation tank, and the solid of precipitation is used as fertilizer with after pump extraction drying.
9. the method utilizing struvite precipitation coupling microdisk electrode to carry out natural pond liquid and marsh gas purifying according to claim 8, it is characterized in that: in described step c, the described liquid pH value for microdisk electrode regulates between 6.5-7.5.
10. the struvite precipitation coupling microdisk electrode that utilizes according to claim 1,2,4,5,7 or 9 carries out the method for natural pond liquid and marsh gas purifying, it is characterized in that: in described steps d, liquid after adjust ph is injected into microdisk electrode device from water collecting basin, in microdisk electrode device, inoculate micro-algae and biogas after passing into desulfurization after airtight incubator is cultivated, culture cycle is 10-20d.
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