CN104928172B - Ventilation temperature control system and algal culture system for algal culture - Google Patents
Ventilation temperature control system and algal culture system for algal culture Download PDFInfo
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- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/12—Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
- C12M41/18—Heat exchange systems, e.g. heat jackets or outer envelopes
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Abstract
The present invention relates to biological technical field, more particularly to a kind of ventilation temperature control system and algal culture system for algal culture.The ventilation temperature control system includes insulation pond, hot water generation unit, cold feed unit, controller and temperature sensor, temperature sensor is placed on the water temperature that can be monitored in real time in insulation pond in insulation pond, gas-liquid heat exchanger is immersed in insulation pond, gas-liquid heat exchanger one end connects with aeration equipment, the other end is connected with bioreactor, it is incubated the appropriate water temperature of pond holding and then carries out heat exchange with gas-liquid heat exchanger, transfer heat to the gas of gas-liquid heat exchanger, gas-liquid heat exchanger connects with bioreactor, the air or carbon dioxide for being passed through bioreactor can have the temperature for being beneficial to micro algae growth, after being passed through in bioreactor, suitable environment can be provided for micro algae growth.
Description
Technical field
The present invention relates to biological technical field, more particularly to a kind of supported for the ventilation temperature control system of algal culture and algae
Grow system.
Background technology
Microalgae be it is a kind of be grown in that species in water body is various, the widely distributed and individual phytoplankton for being generally less than 2mm, it
The production organic matter factory that is driven just as sunlight of cell, by its efficient photosynthesis, utilize luminous energy, absorb CO2With
H2O, the chemical energy such as carbohydrate, protein, fat are converted them into, and discharge O2。
" the efficient large-scale cultivation technology of microalgae " is one of core of Microalgae biotechnology at present.Generally, algae solution is located at light
In bioreactor, air or carbon dioxide, bioreactor and ventilation are passed through to bioreactor by aeration equipment
There is breather line between equipment.Existing bioreactor includes closed photo bioreactor, i.e., closed training system
System, it is the bioreactor built with transparent material.This bioreactor in addition to it can gather luminous energy, Miscellaneous with
Traditional microbial fermentation bioreactor has many similarities.Closed photo bioreactor can realize microalgae list
Kind, purebred culture, and condition of culture is easily controllable, and culture density is high, easy harvest, so more efficient, but build with
Running cost also improves therewith.
Such as Chinese patent ZL02134235.0 discloses a kind of automatic continuous production tubular type bioreactor, it
Reaction vessel is the cylindrical type communicating pipe of transparent light transmissive material, has arrival end and the port of export, and access blending tank, reactor be by
Multilayer U-typed communicating pipe it is cross-superimposed and formed three-dimensional pipeline, light source be located at communicating pipe it is cross-superimposed and formation " # " font
In solid space.Although this both culturing microalgae mode overcomes the shortcomings that open pond is extensive with equipment, complicated, on a large scale
Device is difficult to, and construction cost is high, and is difficult to make full use of natural sunlight, is unsuitable for microalgae low cost, large-scale is supported
Grow.
Chinese patent ZL03128138.9 discloses a kind of closing tubular type bioreactor, by three-dimensional double flat spin formula
The structures such as pipeline and unique U-shaped connecting bend, double tower, zero shearing force infusion pump, carbon dioxide gas injection device, cool-heat-exchanger
Into.Deoxygenation reaction tower in double tower is provided with negative pressure jet pump, can effectively exclude the accumulation oxygen in nutrient solution, and regulation and control tower can reconcile
Hydraulic pressure and with negative pressure to reacting pipe automatic transport nutrient solution.It is big that the reactor overcomes conventional reactor floor space, efficiency
The shortcomings that low, it is possible to achieve large-scale production, but it is complicated, manufacturing cost is high.And reactor is erect and placed, nutrient solution
Need very big energy consumption to be transported to top from bottom with algae solution, the shearing force of algal filament greatly increased, also increase both culturing microalgae into
This.
Chinese patent CN1721523A discloses a kind of bioreactor of microalgae mass culture, including transparent pipeline,
The compositions such as gas resolver, auxiliary pipeline system, culture parameters impression and control facility.Using large-scale gas resolver,
Transparent pipeline arranged in parallel is subjected to parallel connection, the problem for solving closed conduct bioreactor gas exchanges, but together
The problem of manufacturing cost and high operating cost be present in sample.
Chinese patent ZL96216364.3 discloses a kind of latent helical layer algae culturing device of hermetic type circulation, is sprayed by overflow
Device, the board-like bioreactor of overflow, reservoir, circulating pump are connected in sequence, wherein the overflow made using light transmissive material
Board-like bioreactor is placed built with multiple-layer horizontal and the supporting plate with baffle plate of the overfall cross-distribution of levels.This is anti-
Although answering device efficiency very high, multilayer support board structure is sufficiently complex, is unfavorable for extensive amplification production.
And it there is problems in existing runway recognition technology：1st, algae solution temperature and intensity of illumination can not be controlled
System, the efficiency of light energy utilization is low, and algal grown environment is poor, causes to yield poorly and quality shakiness；2nd, open cultivation, easily by other biologies
Pollution, sanitary condition is poor, influences algae silty amount；3rd, the power consumption of runway recognition stirring system is big, and 1500 watts of motors undertake two big
The stirring task of canopy, 110 meters of long greenhouses are insufficient due to stirring, and cause low yield and quality unstable；4th, traditional runway recognition
Key element is difficult to Automated condtrol, and breeding production efficiency is low.
Therefore, the deficiency for more than, it is desirable to provide a kind of growing environment is with favourable conditions, energy-saving low-carbon, makes full use of nature
Resource, microalgae production efficiency are high, cost is low, the algal culture bioreactor of suitable large-scale culture.
The content of the invention
(1) technical problems to be solved
It is an object of the invention to provide a kind of ventilation temperature control system and algal culture system for algal culture, one side
Solving algae solution growth temperature present in existing algal culture technology and illumination can not control, the problem of growing environment difference；Separately
On the one hand solve the problems, such as high energy consumption, low production efficiency and cost to be present in existing algal culture technology high.
(2) technical scheme
In order to solve the above-mentioned technical problem, the invention provides a kind of ventilation temperature control system for algal culture, it is wrapped
Include insulation pond, hot water generation unit, cold feed unit, gas-liquid heat exchanger and controller, cold feed unit, hot water production
Raw unit and insulation pond are sequentially connected；Gas-liquid heat exchanger is immersed in insulation pond, gas-liquid heat exchanger one end and ventilation
Equipment is connected, and the other end is connected with bioreactor；Controller is connected with cold feed unit and hot water generation unit, with control
The supply of chilled water feeding unit cold water and the generation of hot water generation unit hot water.
Wherein, the hot water generation unit is solar water heater, and the installation site of solar water heater is higher than insulation water
Pond, the bioreactor bottom are provided with micropore gas disperser, and gas-liquid heat exchanger is connected with micropore gas disperser.
Wherein, the cold feed unit includes cold water source and water supply pump, and the cold water source passes through water supply pump and solar energy
Water heater is connected, and the water supply pump is connected with controller.
Wherein, temperature sensor is provided with the insulation pond, temperature sensor is connected with controller.
Wherein, insulation pond and the water cooling pond be in three-back-shaped, and water cooling pond is positioned at the outside for being incubated pond, and water cooling pond
Highly less than the height in insulation pond, the overflow ducts that connection insulation pond and water cooling pond are provided with the top of pond are incubated.
Wherein, the aeration equipment includes the revolution speed control mechanism for revolutable and compressed gas holding vessel being connected, compressed gas storage
Tank is connected with gas-liquid heat exchanger.
Another aspect of the present invention provides a kind of algal culture system, it include bioreactor, aeration equipment and on
The breather line temperature control system stated, the bioreactor is with aeration equipment by being immersed in vapor liquid heat exchange in insulation pond
Device connects.
Wherein, the bioreactor includes reactor body, separating element and aeration equipment, the reactor body
For the transparent body of back cover tubulose；The separating element is located at the inside of the reactor body, and the reactor body is divided into
The passage for the connection of left and right two spaces is left in left and right two spaces, the top and bottom of the separating element；The gas
Liquid heat exchanger connects with the bottom in any space of the reactor body.
Wherein, the separating element is the transparent calandria structure that row's vertical tube is in turn connected to form, and each vertical tube upper and lower end is close
Envelope, by setting light source in the vertical tube in centre position；Ultrasonic cleaning rod is provided with reactor body, is cleaned by ultrasonic rod and controller
Connection.
Wherein, it also includes feed liquor pipe network, drain pipe net and multiple bioreactors, the feed liquor of each bioreactor
Mouth is connected with feed liquor pipe network, and the liquid outlet of each bioreactor is connected with drain pipe net.
(3) beneficial effect
The above-mentioned technical proposal of the present invention has the following advantages that：Under the control of the controller, cold feed unit is hot water
Generation unit supplies water source, and hot water generation unit leads to insulation pond after producing hot water, and temperature sensor is placed on insulation pond
In can monitor water temperature in insulation pond in real time, insulation pond keeps appropriate water temperature and then carries out heat with gas-liquid heat exchanger
Exchange, transfer heat to the gas of gas-liquid heat exchanger, gas-liquid heat exchanger connects with bioreactor, is passed through photo-biological
The air or carbon dioxide of reactor can have the temperature beneficial to micro algae growth, after being passed through in bioreactor, can be
Micro algae growth provides favorable environment；Temperature sensor will be incubated sump water temperature information transmission and be judged to controller, controller
And control hot water generation unit and cold feed unit to be operated, and then ensure that the water temperature in insulation pond is in suitable shape
State.
In addition, in ventilation temperature control system and algal culture system provided by the present invention for algal culture, the insulation
Pond be designed as with water cooling pond it is adjacent or three-back-shaped, so design achieve many things at one stroke：1. insulation pond heat can be so corrected in time
The temperature of water；2. unnecessary heat is given into water cooling pond in time, reduces heat and scatter and disappear, improve water cooling pond water temperature, add water heater
The hot time shortens, and saves the energy；3. the installation site of solar water heater is higher than insulation pond, using the solar water heater and
The discrepancy in elevation and the difference in height of insulation pond and water cooling pond in pond are incubated, realizes gravity flow and overflow, efficient energy-saving；4. it is ingenious in design and
It is simple and direct, easily realize scale.The compressed air of design temperature (can be also mixed into certain density CO by the present invention2Gas) it is passed through
Bioreactor is achieved many things at one stroke, that is, realizes being sufficiently mixed for algae solution, realizes the row of living cells gas exchanges at any time and oxygen
Put, also achieve the control of algae solution temperature, can also provide carbon source for microalgae.Here heat energy comes from solar energy, compressed air
Wind energy, CO can be come from2Gas comes from the waste gas that the factory by pretreatment excludes, and therefore, the system is abundant profit
Suitable environment is provided for microalgae with natural resources, is that whole cultivating system uses clear energy sources, low-carbon, green, environmental protection, is easy to
Realize Automated condtrol；The design that the present invention is connected by each bioreactor with feed liquor pipe network and drain pipe net, structure
Simple and direct, assembling is flexible, and algal culture can be made to realize controllable condition, cleaning low-carbon, environment-friendly, steady matter high yield, low cost operation
And large-scale production.
Brief description of the drawings
Fig. 1 is algal culture system schematic of the embodiment of the present invention.
In figure, 1：Bioreactor；2：It is incubated pond；3：Gas-liquid heat exchanger；4：Cold feed unit；5：Hot water produces
Raw unit；6：Temperature sensor；7：Controller；8：Aeration equipment；101：Ultrasonic rod；102：Transparent calandria structure；401：Cold water
Pond；402：Water supply pump；801：Compressed air storage tank；802：Wind power air compressor.
Embodiment
The embodiment of the present invention is described in further detail with reference to the accompanying drawings and examples.Following examples
For illustrating the present invention, but it is not limited to the scope of the present invention.
As shown in figure 1, the invention provides a kind of ventilation temperature control system for algal culture, it include being incubated pond 2,
Hot water generation unit 5, cold feed unit 4, gas-liquid heat exchanger, controller 7 and temperature sensor 6, cold feed unit 4,
Hot water generation unit 5 and insulation pond 2 are sequentially connected；Gas-liquid heat exchanger one end connects with aeration equipment, the other end and photoproduction
Thing reactor is connected, and the gas-liquid heat exchanger 3 between bioreactor 1 and aeration equipment 8 is immersed in insulation pond 2, is made
Gas-liquid heat exchange reaches balance, and temperature sensor 6 is arranged in insulation pond 2 and is connected with controller 7, hot water generation unit
5 and cold feed unit 4 electrically connected with controller 7, work is controlled by controller respectively.
In above-described embodiment, under the control of the controller, cold feed unit is that hot water generation unit supplies water source, hot water
Generation unit leads to insulation pond after producing hot water, and temperature sensor 6, which is placed in insulation pond 2, can monitor insulation water in real time
Water temperature in pond 2, insulation pond 2 keep appropriate water temperature and then carry out heat exchange with gas-liquid heat exchanger 3, transfer heat to
The gas of gas-liquid heat exchanger 3, gas-liquid heat exchanger 3 connect with bioreactor, be passed through bioreactor air or
Carbon dioxide can have the temperature beneficial to micro algae growth, after being passed through in bioreactor 1, can be provided with for micro algae growth
Sharp environment；Temperature sensor 6 passes to controller 7 by the water temperature information of pond 2 is incubated, and controller 7 is judged and controls hot water
Generation unit 5 and cold feed unit 4 are operated, and then ensure that the water temperature in insulation pond 2 is in suitable state.
Wherein, aeration equipment includes the revolution speed control mechanism for revolutable and compressed gas holding vessel that are connected, compressed gas holding vessel with
Gas-liquid heat exchanger connects.
Specifically, hot water generation unit 5 is solar water heater, and solar water heater connects with insulation pond 2, with to guarantor
Heated pool 2 provides hot water；Bioreactor bottom is provided with micropore gas disperser, gas-liquid heat exchanger and micropore gas point
Device connection is dissipated, the air or carbon dioxide being passed through in bioreactor are scattered through micropore gas disperser, can uniformly be passed through
In algae solution, be advantageous to be sufficiently mixed with algae solution, beneficial to micro algae growth；Specifically, cold feed unit 4 includes cold water source and cold
Water pump 402, cold water source are specially water cooling pond 401, and water cooling pond 401 is connected by water supply pump 402 with solar water heater.
The cold water source (pond) is connected by water supply pump with solar water heater inlet pipe, controller and temperature sensor prison
The change of water temperature in the water heater is surveyed, when reaching design temperature, cold water pump startup, the hot water of design temperature is replaced and flows to insulation
Pond, at this moment the water heater is loaded with again needs the cold water that heats, and so going round and beginning again just constantly to provide to be incubated pond sets
The hot water of constant temperature degree, so as to reach the purpose of control water temperature, the temperature of compressed air in the heat exchanger is also just controlled,
And then control the temperature of bioreactor；Thermal water source is provided by solar water heater, make use of this cleaning of solar energy
The energy, low-carbon environment-friendly.
Preferably, the insulation pond 2 is designed to adjacent or three-back-shaped that the inside is to be incubated pond, surrounding with water cooling pond 401
For water cooling pond, usually, the height of water cooling pond is incubated at the top of pond less than the height in insulation pond and is provided with connection insulation water
The overflow ducts of pond and water cooling pond (overfall), when hot water exceedes insulation pond volume, hot water is automatically flowed into by overfall
Water cooling pond.So design reduces heat and scatters and be incubated pond insulation to greatest extent, makes insulation pond temperature control more just
It is prompt.
The algal culture system that another aspect of the present invention provides includes bioreactor 1, aeration equipment 8 and above-mentioned logical
Feed channel temperature control system, bioreactor 1 are connected with aeration equipment 8 by being immersed in gas-liquid heat exchanger 3 in insulation pond 2
Connect.Aeration equipment 8 is preferably to be connected wind power air compressor 802 and compressed air storage tank 801, compressed air storage tank
801 are connected with gas-liquid heat exchanger 3, can be effectively sharp by wind power air compressor 802 so while source of the gas supply is realized
With wind energy, low-carbon environment-friendly.
Specifically, bioreactor 1 includes reactor body, separating element and aeration equipment 8, and reactor body is envelope
The transparent body of bottom tubular；Separating element is located at the inside of reactor body, and reactor body is divided into left and right two spaces, point
The passage for the connection of left and right two spaces is left every the top and bottom of unit；Gas-liquid heat exchanger 3 and reactor body
The bottom connection in any space.
Reactor body is divided into two spaces by above-mentioned separating element, and a space bottom is connected with aeration equipment 8 and led to upwards
Gas, cause the algae solution proportion in this space to increase due to the gas being passed through, the algae solution of two spaces is formed the difference of proportion, lead to
The algae solution of headroom runs to top by the passage left at the top of two spaces, runs downwards and enters not with downward liquid stream
Ventilation space, and then the passage that bottom is left by two spaces bottom is run to, as liquid stream enters ventilation space, such shape
Into the four-dimensional circulation mixing of upper and lower front and rear algae solution it is different mixed with traditional gas-lifting type, add mixing efficiency, add logical
Airway dysfunction, reduce the consumption of tolerance.
Further, separating element is the transparent calandria structure 102 that row's vertical tube is in turn connected to form, and each vertical tube is upper and lower
End sealing, by setting light source in the vertical tube in centre position, the light inside bioreactor 1 can be improved by the setting of light source
According to condition, and then be advantageous to the growth of microalgae；Ultrasonic cleaning rod is provided with reactor body, is cleaned by ultrasonic rod and controller 7
Connection, controlled by controller 7 and be cleaned by ultrasonic rod, reactor fills clear water and is put into ultrasonic rod 101, realizes the automatic washing of ultrasound.
Further, algal culture system includes feed liquor pipe network, drain pipe net and multiple bioreactors 1, each photoproduction
The inlet of thing reactor 1 is connected with feed liquor pipe network, and the liquid outlet of each bioreactor 1 is connected with drain pipe net, so, is led to
The large-scale cultivation of microalgae can be improved by crossing the setting of feed liquor pipe network, drain pipe net and multiple bioreactors 1.
Solar energy and wind energy are fused to algal culture system in the above embodiment of the present invention, realize microalga cultivation process
Middle using energy source clear energy sources (energy that 95-99% can be provided), realize that green low-carbon cultivates；Temperature etc. in algal culture system
Cultivating condition can be by controller 7 (generally computer) control, so as to reach the purpose of stable high yield；Can also be by cultivating bar
Part control reaches the purpose that microalgae cell accumulates the accumulation of certain or some bioactive substances.
In summary, in the ventilation temperature control system provided by the present invention for algal culture and algal culture system, utilize
The compressed air of temperature is determined in advance or carbon dioxide is passed through bioreactor 1 and frustule is realized mixing, and
And possesses the effect of regulation and control algae solution temperature；The center of bioreactor 1 sets transparent calandria structure 102, by the perpendicular of centre position
Light source is set in pipe, algae solution can be made smoothly to be circulated (four-dimensional circulating mixing), and can light filling in pipe, make working flare
Isolate with algae solution, there is provided good illumination condition；Using solar water heater and wind power air compressor 802, by luminous energy and wind
Photo-bioreactor system and algal culture system can be introduced, is preferably minimized both culturing microalgae power consumption, green low-carbon environment-friendly；Pass through
It the setting of feed liquor pipe network, drain pipe net and multiple bioreactors 1, can expand algal culture system production scale of the present invention
Greatly, production efficiency is improved and reduced with production cost.
It the above is only the preferred embodiment of the present invention, it is noted that come for those skilled in the art
Say, without departing from the technical principles of the invention, some improvement and modification can also be made, these improvement and modification also should
It is considered as protection scope of the present invention.
Claims (8)
- A kind of 1. ventilation temperature control system for algal culture, it is characterised in that：It include be incubated pond, hot water generation unit, Cold feed unit, gas-liquid heat exchanger and controller, cold feed unit, hot water generation unit and insulation pond connect successively Connect；Gas-liquid heat exchanger is immersed in insulation pond, and gas-liquid heat exchanger one end connects with aeration equipment, the other end and photo-biological Reactor connects；Controller is connected with cold feed unit and hot water generation unit, to control the confession of cold feed unit cold water Should and hot water generation unit hot water generation；The cold feed unit includes cold water source and water supply pump, and the cold water source passes through Water supply pump is connected with hot water generation unit, and the water supply pump is connected with controller；The cold water source is water cooling pond, the insulation water Pond is in three-back-shaped with water cooling pond, and water cooling pond is positioned at the outside in insulation pond, and the height of water cooling pond is less than the height in insulation pond, The overflow ducts of connection insulation pond and water cooling pond are provided with the top of insulation pond.
- 2. the ventilation temperature control system according to claim 1 for algal culture, it is characterised in that：The hot water produces single Member is solar water heater, and the installation site of solar water heater is set higher than insulation pond, the bioreactor bottom There is micropore gas disperser, gas-liquid heat exchanger is connected with micropore gas disperser.
- 3. the ventilation temperature control system according to claim 1 for algal culture, it is characterised in that：In the insulation pond Temperature sensor is provided with, temperature sensor is connected with controller.
- 4. the ventilation temperature control system according to claim 1 for algal culture, it is characterised in that：The aeration equipment bag The revolution speed control mechanism for revolutable being connected and compressed gas holding vessel are included, compressed gas holding vessel is connected with gas-liquid heat exchanger.
- A kind of 5. algal culture system, it is characterised in that：It includes bioreactor, aeration equipment and claim 1-4 and appointed Breather line temperature control system described in one, the bioreactor is with aeration equipment by being immersed in gas-liquid in insulation pond Heat exchanger connects.
- 6. algal culture system according to claim 5, it is characterised in that：The bioreactor includes reactor master Body, separating element and aeration equipment, the reactor body are the transparent body of back cover tubulose；The separating element is positioned at described anti- The inside of device main body is answered, the reactor body is divided into left and right two spaces, the top and bottom of the separating element are stayed There is the passage for the connection of left and right two spaces；The gas-liquid heat exchanger and the bottom in any space of the reactor body Connection.
- 7. algal culture system according to claim 6, it is characterised in that：The separating element is that row's vertical tube connects successively Connect the transparent calandria structure to be formed, each vertical tube upper and lower end sealing, by setting light source in the vertical tube in centre position；Reactor body Ultrasonic cleaning rod is inside provided with, is cleaned by ultrasonic rod and is connected with controller.
- 8. algal culture system according to claim 5, it is characterised in that：Its also include feed liquor pipe network, drain pipe net and Multiple bioreactors, the inlet of each bioreactor are connected with feed liquor pipe network, the liquid outlet of each bioreactor It is connected with drain pipe net.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510257777.0A CN104928172B (en) | 2015-05-19 | 2015-05-19 | Ventilation temperature control system and algal culture system for algal culture |
| KR1020177036632A KR102043623B1 (en) | 2015-05-19 | 2016-05-18 | Photobioreactors for algal farming and algal farming systems |
| PCT/CN2016/082541 WO2016184394A2 (en) | 2015-05-19 | 2016-05-18 | Photobioreactor used for algae cultivation, and algae cultivation system |
| US15/575,282 US11319522B2 (en) | 2015-05-19 | 2016-05-18 | Photobioreactor used for algae cultivation, and algae cultivation system |
| JP2018512471A JP6570736B2 (en) | 2015-05-19 | 2016-05-18 | Algal aquaculture photobioreactor and algae culture system |
| ZA2017/08668A ZA201708668B (en) | 2015-05-19 | 2017-12-19 | Photobioreactor used for algae cultivation, and algae cultivation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510257777.0A CN104928172B (en) | 2015-05-19 | 2015-05-19 | Ventilation temperature control system and algal culture system for algal culture |
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| CN104928172A CN104928172A (en) | 2015-09-23 |
| CN104928172B true CN104928172B (en) | 2018-02-13 |
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| US11319522B2 (en) | 2015-05-19 | 2022-05-03 | Zhongzhi He | Photobioreactor used for algae cultivation, and algae cultivation system |
| CN109554277B (en) * | 2018-12-26 | 2024-09-24 | 博生微藻(北京)科技有限公司 | Photobioreactor microalgae cultivation system and pipe network system |
Citations (2)
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| CN203546029U (en) * | 2013-11-28 | 2014-04-16 | 浙江龙驰科技有限公司 | Solar biogas digester |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201305590Y (en) * | 2008-11-20 | 2009-09-09 | 上海交通大学 | Device for culturing microalgae utilizing waste gas from electric power plant |
| CN203546029U (en) * | 2013-11-28 | 2014-04-16 | 浙江龙驰科技有限公司 | Solar biogas digester |
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