CN103525693A - High-yielding biogas fermenting device and production method of biogas waste fertilizer rich in selenium - Google Patents
High-yielding biogas fermenting device and production method of biogas waste fertilizer rich in selenium Download PDFInfo
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Abstract
The invention relates to the technical field of application of rural biogas and production of biogas fertilizer, and provides a high-yielding biogas fermenting device and a production method of biogas waste fertilizer rich in selenium. The high-yielding biogas fermenting device and the production method of the biogas waste fertilizer rich in selenium change the current situations that the production of rural biogas at present is limited by seasons and biogas output is largely reduced due to low temperature in winter, and overcome the defect of low utilization rate of the fertilizer caused by incorrect use of the biogas fertilizer. Heating and heat preservation are carried out on a biogas digester in winter through a toroidal heat-retaining pool arranged at the periphery of the biogas digester, so that the biogas yield of the biogas digester is improved in low-temperature seasons, microelements such as selenium, zinc and iron are added into fermenting biogas liquid to improve the biogas yield of the biogas, and meanwhile biogas slurry and biogas mud rich in selenium are produced. The biogas slurry rich in selenium is used for sprinkling irrigation of crops, and the biogas mud rich in selenium is used for producing organic fertilizer rich in selenium.
Description
Technical field
The present invention relates to production and use of marsh gas application and biogas fertilizer production technical field, for the current production and use of marsh gas, produce the present situation being subject to seasonal restrictions, winter low temperature causes biogas output and greatly declines, the improper use of biogas fertilizer causes the defect that utilization rate of fertilizer is low, is specifically related to a kind of high yield biogas fermentation device and rich selenium biogas manure production method.
Background technology
It is the most effectual way that China solves rural energy problem and fertilizer problem that biogas is promoted.Yet still there are a lot of bottlenecks in China's production and use of marsh gas technology at present.One of its most important bottleneck is exactly: in every winter, temperature is low, and methane-generating pit fermentation slowly, gas production rate declines greatly, even be not enough to maintain normal biogas and use, this makes a lot of peasant households construction methane generating pit of being unwilling, and is also that biogas is difficult to the one of the main reasons of promoting; In addition, due to rural area large-scale popularization biogas, three seasons of spring and summer autumn produce a large amount of methane liquids and cripple every year, it makes full use of is also the important matching construction that biogas is promoted.The four seasons of the methane-generating pit scientific utilization of stablizing aerogenesis and natural pond liquid, cripple is that biogas is promoted and the basis of scientific development smoothly.
Summary of the invention
When low for the winter temperature existing in existing biogas production, methane-generating pit ferments slowly, the problem that gas production rate is low.
First object of the present invention is to provide a kind of high yield biogas fermentation device.
Second object of the present invention has been to provide a kind of method of utilizing said apparatus to produce rich selenium biogas manure.
Inventive concept of the present invention is: by being arranged at the thermal insulation pool of methane-generating pit periphery, in the winter time methane-generating pit is carried out to heating and thermal insulation to improve the biogas output of methane-generating pit in winter, and by adding the trace elements such as selenium, zinc, iron to improve biogas output in fermentation biogas liquid, produce rich selenium natural pond liquid and cripple simultaneously.Rich selenium natural pond liquid is as crops sprinkling irrigation, and rich selenium cripple is for the production of selenium-enriched organic fertilizer.
In order to realize first object, the present invention adopts following technical scheme:
A kind of high yield biogas fermentation device, comprise methane-generating pit, it is characterized in that: a side of described methane-generating pit is provided with filtering basin, filtering basin are concordant with methane-generating pit bottom, the interior dimensions of filtering basin is: 1-2 rice is long, 0.5-1 rice is wide, 8-9 rice is dark, the top of filtering basin exceeds methane-generating pit liquid level 10-30 centimetre, it is the circular open of 20-30 centimetre that the below of methane-generating pit is provided with a diameter higher than the position of cripple upper surface, described circular open is connected with a side of filtering basin, and described circular open place is provided with methane-generating pit opening valve, in order to control the natural pond liquid of methane-generating pit, enters filtering basin;
Described filtering basin inside is longitudinally provided with a filter plate, and the frame of filter plate is seamless to be fixed in the longitudinal socket of filtering basin inwall, and the aperture of filter plate is 0.5-5 millimeter, and the longitudinal socket for seamless fixedly filter plate on filtering basin inwall has two, for changing filter plate;
The opposite side bottom opening of described filtering basin is also connected with the lateral opening of a settling tank by pipeline, the lateral opening of described settling tank is arranged at 1/3rd At The Heights of settling tank, described filtering basin lead on the connecting pipe of settling tank and are disposed with valve and the first high-pressure pump, described valve is for the circulation of controlled filter natural pond liquid, and described the first high-pressure pump plays the effect that natural pond liquid is filtered in pumping.
The liquid level top of described settling tank is provided with rainer, and rainer includes the second high-pressure pump and Spray-irrigation interface;
Described methane-generating pit periphery arranges the thermal insulation pool of an annular, methane-generating pit is positioned at the centre of thermal insulation pool, the top of thermal insulation pool is positioned at 2/3rds At The Heights of methane-generating pit, distance between this thermal insulation pool inwall and methane-generating pit outer wall is 1.5-3.0 rice, distance between the bottom inside of this thermal insulation pool and the bottom outer wall of methane-generating pit is at least 2 meters, the side-wall material of described methane-generating pit is that thickness that reinforced concrete casting forms is the dividing plate of 3-10 centimetre, between thermal insulation pool and methane-generating pit by this dividing plate transferring heat; In casting design, in this dividing plate, every 1 meter of width, be cast with a reinforcing bar pillar as dividing plate skeleton and reinforce methane-generating pit, the passive methane-generating pit pillar of 3-6 root is arranged at methane-generating pit bottom;
The side of described thermal insulation pool and bottom construction be the double-deck body of wall for being comprised of interior wall and exterior wall all, between interior wall and exterior wall, be 30-50 centimetre of wide gap, in this gap, be full of thermal insulation material (expanded plastic or other thermal insulation materials), form thermal insulating warm-keeping layer, as the use of heat-insulation and heat-preservation.
In order to realize second object, the present invention adopts following technical scheme:
Utilize said apparatus to produce a method for rich selenium biogas manure, it is characterized in that:
(1) when spring, daily maximum temperature was stabilized in more than 20 ℃, the farm manure becoming thoroughly decomposed is added to methane-generating pit, when injecting clear water to methane-generating pit, to adding water soluble selenium salt, water-soluble zinc salt and water-soluble molysite to final quality concentration in methane-generating pit, be: water soluble selenium salt 10-20ppm, water-soluble zinc salt 10-20ppm and water-soluble molysite 20-40ppm, the mass ratio of water soluble selenium salt, water-soluble zinc salt and the water-soluble molysite adding is 1:1:2, then according to conventional biogas fermentation technical finesse.
(2) daily maximum temperature is stablized while dropping to 20-25 ℃ in the fall, the organic matter (crop material of farm manure or chopping or other) of heat production can ferment, after spending the night with clear water infiltration, drain open fire, then transfer in thermal insulation pool and pile up around methane-generating pit, accumulating amount is not less than the space of thermal insulation pool 2/3 (except leaving artificial aisle, pile up) as far as possible, sealing thermal insulation pond, give free rein to fermentation, approximately about one month, the interior farm manure of thermal insulation pool or the crop material of chopping or the fermentation of the organic matter of other heat production of can fermenting produce a large amount of heats, this heat distributes and the natural pond liquid in methane-generating pit is heated in thermal insulation pool,
(3) spring daily maximum temperature stable while going back up to 20-25 ℃, farm manure or crop material in thermal insulation pool all become thoroughly decomposed substantially, now clear out cripple and natural pond liquid in methane-generating pit, then the farm manure becoming thoroughly decomposed of thermal insulation pool is transferred to methane-generating pit and according to method interpolation water soluble selenium salt, water-soluble zinc salt and the water-soluble molysite of (1), carry out biogas fermentation;
Described water soluble selenium salt is Sodium Selenite or sodium selenate;
Described water-soluble zinc salt is zinc sulfate, zinc chloride or zinc carbonate;
Described water-soluble molysite is ferrous sulfate or iron protochloride or iron(ic) chloride.
When described methane-generating pit is cleared up natural pond liquid before reloading, natural pond liquid is filtered and is stored in settling tank, obtaining rich selenium natural pond liquid sprays for crops, the a small amount of thin cripple that the cripple of the methane-generating pit bottom cleaning out when methane-generating pit reloads and settling tank bottom settlings go out is pulverized after can dewatering respectively, and mixes and make granular selenium-enriched organic fertilizer according to 10/1～1/1 mass ratio with agricultural water-loss reducer.
Above 3 technology about rich selenium biogas fermentation also can be according to different areas and user's thereof the flexible Application that needs, for example in whole winter and temperature, can use thermal insulation pool heating lower spring, at northern area, can be in the spring, autumn, all use thermal insulation pool heating in three seasons of winter, but can not depart from core technology of the present invention: (1) produces heat by dropping into the organic of farm manure or crop material or other heat production of can fermenting to thermal insulation pool and making it fermentation in thermal insulation pool, then utilize thermal insulation pool to heat methane-generating pit, to maintain the required heat of production of methane tank biogas, thereby guarantee methane-generating pit normal gas producing, (2) before methane-generating pit carries out biogas fermentation, dropping into water soluble selenium salt, water-soluble zinc salt and water-soluble molysite to final quality concentration is: water soluble selenium salt 10-20ppm, water-soluble zinc salt 10-20ppm and water-soluble molysite 20-40ppm, the mass ratio of water soluble selenium salt, water-soluble zinc salt and the water-soluble molysite adding is preferably 1:1:2, and the kind of the fertilizer that these three kinds of water-soluble salts and quality ratio thereof also can be used according to biogas fermentation is different and adjust to some extent.
The present invention compares with existing biogas technology, has the following advantages and beneficial effect:
1, zinc-iron selenium inorganic elements is added in the liquid of natural pond, improved methagen and decomposed organic vigor, compare with not adding selenium zinc-iron salt, can improve the output of biogas more than 30%.
2, the peripheral thermal insulation pool that has added heating and thermal insulation effect of methane-generating pit, guarantees that methane-generating pit can maintain stable temperature in the winter time, thereby maintains in the winter time the stable rate of biogas.
3, utilize methagen that inorganic selenium is changed into organoselenium, obtained lasting rich selenium natural pond liquid fertilizer and the cripple fertilizer of fertilizer efficiency, produce meticulous organic selenium fertilizer.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of a kind of high yield biogas fermentation device of the present invention;
Fig. 2 is the two dimensional structure schematic diagram of a kind of high yield biogas fermentation device of the present invention.
The description of reference numerals of Fig. 1 and Fig. 2 is as follows: 1-methane outlet, 2-methane-generating pit vault, 2-1-dividing plate, 3-natural pond liquid, 4-cripple, 5-filtering basin, 6-filter plate, 7-thermal insulation pool, 7-1-thermal insulating warm-keeping layer, 8-settling tank, 9-filters natural pond liquid, 10-the second high-pressure pump, 11-Spray-irrigation interface, 12-valve, 12-1-the first high-pressure pump, 13-methane-generating pit opening valve, 14-methane-generating pit pillar, the crop material of 15-farm manure or chopping or other organic matters, 16-dividing plate skeleton.
Embodiment
Below in conjunction with accompanying drawing, apparatus and method of the present invention are described in further detail, not quite clear part is shown in summary of the invention part.
Embodiment 1:
A kind of high yield biogas fermentation device, comprise methane-generating pit, one side of methane-generating pit is provided with filtering basin 5, filtering basin 5 are concordant with methane-generating pit bottom, the interior dimensions of filtering basin 5 is: 1.5 meters long, 0.8 meter wide, 8 meters dark, the top of filtering basin 5 exceeds methane-generating pit liquid level 10-30 centimetre, it is the circular open of 25 centimetres that the below of methane-generating pit is provided with a diameter higher than the position of cripple 4 upper surfaces, described circular open is connected with a side of filtering basin 5, and the circular open place of described methane-generating pit is provided with methane-generating pit opening valve 13, in order to control the natural pond liquid of methane-generating pit, enters filtering basin 5;
The opposite side bottom opening of filtering basin 5 is also connected with the lateral opening of a settling tank 8 by pipeline, the lateral opening of described settling tank is arranged at 1/3rd At The Heights of settling tank, filtering basin 5 lead on the connecting pipe of settling tank 8 and are disposed with valve 12 and the first high-pressure pump 12-1, described valve 12 is for the circulation of controlled filter natural pond liquid, and described the first high-pressure pump 12-1 plays the effect that natural pond liquid is filtered in pumping.
The liquid level top of described settling tank 8 is provided with rainer, and rainer includes the second high-pressure pump 10 and Spray-irrigation interface 11;
It is example that the present embodiment be take the biogas amount that one family uses, described methane-generating pit is the main pond that produces biogas, and its three-dimensional shape is cylindrical for improvement, and improvement part is that top is dome-shaped, methane outlet 1 is located at top, 11 meters of 4 meters of the diameters of described methane-generating pit, height;
Described methane-generating pit periphery arranges the thermal insulation pool 7 of an annular, methane-generating pit is positioned at the centre of thermal insulation pool 7, the top of thermal insulation pool 7 is positioned at 2/3rds At The Heights of methane-generating pit, distance between these thermal insulation pool 7 inwalls and methane-generating pit outer wall is 2 meters, distance between the bottom inside of thermal insulation pool 7 and the bottom outer wall of methane-generating pit is 5 meters, the side-wall material of described methane-generating pit is that thickness that reinforced concrete casting forms is the dividing plate 2-1 of 5 centimetres, between thermal insulation pool 7 and methane-generating pit by this dividing plate 2-1 transferring heat; In casting design, in this dividing plate 2-1, every 1 meter of width, be cast with a reinforcing bar pillar as dividing plate skeleton 16 and reinforce methane-generating pit, 4 passive methane-generating pit pillars 14 are arranged at methane-generating pit bottom;
The side of described thermal insulation pool 7 and bottom construction be the double-deck body of wall for being comprised of interior wall and exterior wall all, between the interior wall of side and exterior wall, be 40 centimetres of wide gaps, between the interior wall of bottom and exterior wall, be 30 centimetres of wide gaps, in the gap of side and bottom, be all full of expanded plastic, form thermal insulating warm-keeping layer 7-1, as the use of heat-insulation and heat-preservation.
Utilize above-mentioned high yield biogas fermentation device to produce biogas and rich selenium biogas manure:
Daily maximum temperature is stablized while dropping to 20-25 ℃ in the fall, to the interior input farm manure of thermal insulation pool 7 and chopping, be 2-3 cun of long crop straw spontaneous fermentation, accumulating amount is not less than the space of thermal insulation pool interior 2/3, sealing thermal insulation pond 7, the interior farm manure of thermal insulation pool 7 and crop straw fermentation produce a large amount of heats, this heat is for heating to the natural pond liquid 3 in methane-generating pit, spring, daily maximum temperature was stablized while going back up to 20-25 ℃, clear out cripple and natural pond liquid in methane-generating pit, again the farm manure becoming thoroughly decomposed of thermal insulation pool and crop straw are transferred to and in methane-generating pit, added Sodium Selenite, zinc chloride and ferrous sulfate to final quality concentration are: Sodium Selenite 15ppm, zinc chloride 15ppm and ferrous sulfate 30ppm carry out biogas fermentation, can greatly improve methane tank gas production amount (with do not add selenium zinc-iron salt and compare, biogas output at least improves 30%.), and the rich selenium natural pond liquid of settling tank can be used for crops sprinkling irrigation, after the cripple of methane-generating pit and settling tank bottom is dry, mixes and can make granular selenium-enriched organic fertilizer with agricultural water-loss reducer.
Embodiment 2:
This application embodiment is the further practice of embodiment 1, puts into practice Enshi City military outpost township, Hubei Province, place, and the time is 2010, and methane-generating pit is 100m
3, biogas digested liquor of biogas generating pit volume is 70m
3, methane-generating pit top arcuate space 30m
3for holding the space of biogas.In summer, according to conventional biogas fermentation method, to methane-generating pit, add farm manure, add water and arrive fixedly water level (lower than the top 10-30 centimetre of filtering basin 5), methane-generating pit fermentating liquid volume is 70m
3, then add 350 grams of Sodium Selenites, 350 grams of zinc chloride and 700 grams of ferrous sulfate in the liquid of natural pond.In the time of need to irrigating crops with natural pond liquid, open methane-generating pit opening valve 13 and valve 12, the natural pond liquid 3 of methane-generating pit is filtered in settling tank 8, and this natural pond liquid is rich in organoselenium, by the second high-pressure pump, rich selenium natural pond liquid pump is delivered to field and is sprayed in crops; When dropping to, methane gas producing amount is not enough to maintain while using, need to clear up methane-generating pit, pump natural pond liquid, collect the cripple 4 in methane-generating pit and settling tank, cripple 4 is rich in organoselenium, and the cripple of collecting is dry, pulverize, mix according to the mass ratio of 8:1 with agricultural water-loss reducer, be made into rich granules of selenium fertilizer, for the meticulous cultivation of the plants such as vegetables, flowers, fruit tree.
Daily maximum temperature is stablized while dropping to 20-25 ℃ in the fall, methane tank gas production amount starts to decline, now by the crop straw chopping of farm manure and autumn harvest, spraying the moistening stalk of a small amount of clear water spends the night, drain (not flow out open fire, being as the criterion), then be transferred to the interior accumulation of thermal insulation pool 7, keep compost tightly to surround methane-generating pit outer wall, accumulating amount is not less than the space of thermal insulation pool interior 2/3, and sealing thermal insulation pond, the spontaneous fermentation in thermal insulation pool of farm manure and crop straw, produce a large amount of heats, this heat heats methane-generating pit, make methane-generating pit still maintain gas production rate in summer, to when spring, daily maximum temperature went back up to more than 20 ℃, clean out in thermal insulation pool 7 the organic of fermentation maturity and drop in methane-generating pit the raw material as biogas fermentation.
Specific embodiment described in this specification sheets is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (5)
1. a high yield biogas fermentation device, comprise methane-generating pit, it is characterized in that: a side of described methane-generating pit is provided with filtering basin, filtering basin are concordant with methane-generating pit bottom, the top of filtering basin exceeds methane-generating pit liquid level 10-30 centimetre, it is the circular open of 20-30 centimetre that the below of methane-generating pit is provided with a diameter higher than the position of cripple upper surface, and described circular open is connected with a side of filtering basin, and described circular open place is provided with methane-generating pit opening valve;
Described filtering basin inside is longitudinally provided with a filter plate, and the aperture of filter plate is 0.5-5 millimeter;
The opposite side bottom opening of described filtering basin is also connected with the lateral opening of a settling tank by pipeline, and described filtering basin lead on the connecting pipe of settling tank and are disposed with valve and the first high-pressure pump;
The liquid level top of described settling tank is provided with rainer, and rainer includes the second high-pressure pump and Spray-irrigation interface;
Described methane-generating pit periphery arranges the thermal insulation pool of an annular, methane-generating pit is positioned at the centre of thermal insulation pool, the side of described thermal insulation pool and bottom construction be the double-deck body of wall for being comprised of interior wall and exterior wall all, is 30-50 centimetre of wide gap between interior wall and exterior wall, in described gap, is full of thermal insulation material.
2. device according to claim 1, it is characterized in that: the top of described thermal insulation pool is positioned at 2/3rds At The Heights of methane-generating pit, distance between described thermal insulation pool inwall and methane-generating pit outer wall is 1.5-3.0 rice, and the distance between the bottom inside of described thermal insulation pool and the bottom outer wall of methane-generating pit is at least 2 meters.
3. device according to claim 1 and 2, it is characterized in that: the side-wall material of described methane-generating pit is that thickness that reinforced concrete casting forms is the dividing plate of 3-10 centimetre, in described dividing plate, every 1 meter of width, be cast with a reinforcing bar pillar as dividing plate skeleton and reinforce methane-generating pit, the passive methane-generating pit pillar of 3-6 root is arranged at methane-generating pit bottom.
4. device according to claim 1 and 2, is characterized in that: described thermal insulation material is expanded plastic.
5. a method of utilizing the arbitrary described device of claim 1-4 kind to produce rich selenium biogas manure, is characterized in that:
(1) when spring, daily maximum temperature was stabilized in more than 20 ℃, the farm manure becoming thoroughly decomposed is added to methane-generating pit, when injecting clear water to methane-generating pit, to adding water soluble selenium salt, water-soluble zinc salt and water-soluble molysite to final quality concentration in methane-generating pit, be: water soluble selenium salt 10-20ppm, water-soluble zinc salt 10-20ppm and water-soluble molysite 20-40 ppm, the mass ratio of water soluble selenium salt, water-soluble zinc salt and the water-soluble molysite adding is 1:1:2, then according to conventional biogas fermentation technical finesse;
(2) daily maximum temperature is stablized while dropping to 20-25 ℃ in the fall, and the organic matter of the heat production of can fermenting drains open fire after spending the night with clear water infiltration, then transfer in thermal insulation pool and pile up around methane-generating pit, accumulating amount is not less than the space of thermal insulation pool 2/3, and sealing thermal insulation pond gives free rein to fermentation;
(3) spring daily maximum temperature stable while going back up to 20-25 ℃, clear out cripple and natural pond liquid in methane-generating pit, then the farm manure becoming thoroughly decomposed of thermal insulation pool is transferred to methane-generating pit and according to method interpolation water soluble selenium salt, water-soluble zinc salt and the water-soluble molysite of (1), carry out biogas fermentation;
Described water soluble selenium salt is Sodium Selenite or sodium selenate;
Described water-soluble zinc salt is zinc sulfate, zinc chloride or zinc carbonate;
Described water-soluble molysite is ferrous sulfate or iron protochloride or iron(ic) chloride;
When described methane-generating pit is cleared up natural pond liquid before reloading, natural pond liquid is filtered and is stored in settling tank, obtaining rich selenium natural pond liquid sprays for crops, the a small amount of thin cripple that the cripple of the methane-generating pit bottom cleaning out when methane-generating pit reloads and settling tank bottom settlings go out is pulverized after can dewatering respectively, and mixes and make granular selenium-enriched organic fertilizer according to 10/1～1/1 mass ratio with agricultural water-loss reducer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310526321.0A CN103525693B (en) | 2013-10-30 | 2013-10-30 | High-yielding biogas fermenting device and production method of biogas waste fertilizer rich in selenium |
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| CN104498338A (en) * | 2015-01-22 | 2015-04-08 | 陆永柱 | Device for improving biogas fluid turbulence effect of bending type methane generation system |
| CN108315254A (en) * | 2018-04-13 | 2018-07-24 | 杭州杭氧股份有限公司 | A kind of biomass waste material produces the device of carbon dioxide, methane and bio-feritlizer |
| CN108863475A (en) * | 2018-06-08 | 2018-11-23 | 广西大学 | The method for preparing selenium-enriched liquid organic fertilizer using the waste water and swine excrement in slaughterhouse |
| CN111304064A (en) * | 2020-03-11 | 2020-06-19 | 唐山际宇岩土工程有限公司 | Solar energy and methane combined heat storage system |
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| CN101225006A (en) * | 2008-01-29 | 2008-07-23 | 南京农业大学 | Method for preparing zinc-iron-selenium enriched bio-fertilizer and method of use thereof |
| CN101575564A (en) * | 2009-06-24 | 2009-11-11 | 刘键 | Methane tank and method for preparing methane |
| CN202465383U (en) * | 2012-03-09 | 2012-10-03 | 孙心 | Device for treating domestic sewage |
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| CN101225006A (en) * | 2008-01-29 | 2008-07-23 | 南京农业大学 | Method for preparing zinc-iron-selenium enriched bio-fertilizer and method of use thereof |
| CN101575564A (en) * | 2009-06-24 | 2009-11-11 | 刘键 | Methane tank and method for preparing methane |
| CN202465383U (en) * | 2012-03-09 | 2012-10-03 | 孙心 | Device for treating domestic sewage |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104498338A (en) * | 2015-01-22 | 2015-04-08 | 陆永柱 | Device for improving biogas fluid turbulence effect of bending type methane generation system |
| CN104498338B (en) * | 2015-01-22 | 2016-03-23 | 班乐平 | Bending-type methane generation systems promotes the device of natural pond liquid turbulent flow effect |
| CN108315254A (en) * | 2018-04-13 | 2018-07-24 | 杭州杭氧股份有限公司 | A kind of biomass waste material produces the device of carbon dioxide, methane and bio-feritlizer |
| CN108863475A (en) * | 2018-06-08 | 2018-11-23 | 广西大学 | The method for preparing selenium-enriched liquid organic fertilizer using the waste water and swine excrement in slaughterhouse |
| CN111304064A (en) * | 2020-03-11 | 2020-06-19 | 唐山际宇岩土工程有限公司 | Solar energy and methane combined heat storage system |
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| CN103525693B (en) | 2015-04-22 |
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