CN102718283B - Solar water quality improving machine - Google Patents
Solar water quality improving machine Download PDFInfo
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- CN102718283B CN102718283B CN 201210249913 CN201210249913A CN102718283B CN 102718283 B CN102718283 B CN 102718283B CN 201210249913 CN201210249913 CN 201210249913 CN 201210249913 A CN201210249913 A CN 201210249913A CN 102718283 B CN102718283 B CN 102718283B
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Abstract
The invention provides a solar water quality improving machine. The solar water quality improving machine comprises a solar power assembly, a bottom layer flocculent sludge absorption and discharge assembly, floaters, and a moving and controlling assembly, wherein the floaters are respectively used for bearing the solar power assembly and the bottom layer flocculent sludge absorption and discharge assembly; and the two floaters are integrally connected into a whole through a connection rod. According to the solar water quality improving machine provided by the invention, the solar power assembly, the bottom layer flocculent sludge absorption and discharge assembly and the like are assembled together by using solar photovoltaic power; flocculent bottom mud at a bottom layer of a water bodyis absorbed and discharged to a surface layer of the water body by using the solar photovoltaic power; the discharge amount of flocculent sludge at the bottom layer is controlled by using the illumination as a condition index, so that the sedimentation of the bottom mud of the water body is reduced; organics decomposition and nutrient release in the sludge can be promoted; the nutrient balance ofthe water body is adjusted; the water quality is improved; the sedimentation pollution is reduced; and the level of productive capacity of the water body is improved.
Description
Technical field
The present invention relates to the water pollution control field, relate in particular to a kind of water body substrate improvement adjusting device.
Background technology
Discover, nutritive substances such as the nitrogen that drops in the water body, phosphorus, except 20%～30% was absorbed by hydrobiont, remaining all entered in the water body environment, wherein about 60～70% deposits in the bed mud.On the one hand, the existence of large amount of organic in the water body bed mud not only causes the bed mud deposition, also can produce ammonia nitrogen, nitrite, methane, hydrogen sulfide etc. and go back the ortho states material, causes water quality deterioration, badly influences water environment safety.On the other hand, the water body bed mud also is nutrition library, and a large amount of nutritive salt that the water body primary productivity needs are from bed mud, and reasonably discharging and utilizing the rich nutritive material in the bed mud is the important channel of improving bottom environment, improving the water body productivity.
At present, domestic and international treatment process to the water body bed mud mainly contains mechanical desilting, microorganism improvement, chemicals adjustment etc.The machinery desilting mainly is the mud that utilizes removing water bottom such as waterpower fish pond excavator group, and this method can't be accomplished the recycling to nutritive substance in the bed mud; Though microbial process has improved the recycling of rich nutritive material in the bed mud, because uncontrollable microbial growth condition, its effect can't be stablized; Though the chemical process instant effect causes chemical residues easily, the problem of existence is a lot, can't tackle the problem at its root.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of sun power water quality improvement machine, can regulate and control processing to water body substrate and water quality according to the solar irradiation situation, reach and reduce the pollution of bed mud deposition, promote organism to decompose and nutritive salt release, the rich water water transfer, improvement water quality reduces deposition and pollutes, and improves the purpose of the water body level of the productive forces.
The present invention is achieved by the following technical solutions:
A kind of sun power water quality improvement machine is characterized in that:
Described sun power water quality improvement machine comprises that solar power assembly and bottom floc sludge absorb the dispensing assembly, and be respectively applied to carry first buoyancy aid of solar power assembly and second buoyancy aid that the bottom floc sludge absorbs the dispensing assembly, connect as one by union lever between two buoyancy aids, wherein:
The solar power assembly is made up of the electro-motor that is installed in solar energy photovoltaic panel on first buoyancy aid, potentiostat, illuminance controller, vertical guide frame and is used for driving first buoyancy aid,
Retaining collar on the guide frame, the collar is positioned at the top of first buoyancy aid, penetrate a guide rope in the collar, its two ends are separately fixed on the sloping ridge of water body both sides, 2 contact switches are installed on the guide rope at interval, contact switch is connected with the electro-motor signal, the guide rope back and forth movement that first buoyancy aid can be between 2 contact switches in water surface upper edge;
The bottom floc sludge absorbs the dispensing assembly to be made up of bottom floc sludge absorbing cavity and turbulence pump,
It is the microscler pipeline of scalable bending that the bottom floc sludge absorbs the dispensing chamber, bed mud absorbs the dispensing chamber and is installed in bed mud absorption dispensing second buoyancy aid bottom, is positioned at water surface below, parallel with the water surface and the close water surface of its exit end, turbulence pump is installed in the exit end inboard, bed mud absorbs its entrance end port of dispensing chamber and stretches to the cultivating pool bottom downwards, near the bed mud surface;
Union lever one end and first buoyancy aid are rotationally connected, and an end is fixedlyed connected with second buoyancy aid, and union lever and second buoyancy aid can horizontally rotate around first buoyancy aid;
After the output terminal of solar energy photovoltaic panel connects potentiostat and illuminance controller, be connected electro-motor and turbulence pump respectively by separate pilot circuit again.
The present invention is assembled into solar power assembly and bed mud absorption dispensing assembly etc. together, utilize solar power that the cotton-shaped bed mud absorption of water bottom is applied to the water body top layer, utilize oxygen that surface water photosynthesis produces etc. to satisfy cenobium growth needs in the bottom floc sludge, reach decomposing organic matter, discharge nutritive salt, the rich water water transfer, reduce the purpose that deposition is polluted, improved the level of the productive forces of water body.First buoyancy aid carrying solar power assembly back and forth moves along guide rope in water body, the bed mud of second buoyancy aid carrying simultaneously absorbs releasing unit and rotates around first buoyancy aid, therefore sun power water quality improvement machine can easily reach any corner of water bottom, evenly absorbs the floc sludge of bottom.In addition, the operation of system is the control index with the illuminance, can regulate working time and speed automatically according to intensity of illumination, the control bed mud absorbs dispensing quantity, takes full advantage of photosynthesis, prevent that the bed mud dispensing is excessive and not enough, reach and reduce the bed mud deposition, promote organism to decompose and nutritive salt release, the rich water water transfer, reduce to culture and pollute, improve the level of the productive forces and the purpose of culturing efficient of pond waters.
During concrete operations, at first, adjust bed mud according to the actual water surface elevation of water body and absorb the flexible height that discharges the chamber, the water body height of itself and water body is complementary; Then, guide rope is penetrated in the collar, the guide rope two ends are fixed on the ridge, water body slope, and at guide rope contact switch is installed, when the installation site of contact switch is moved between two contact switches with the sun power water improving machine, do not interfere with the sloping ridge and bed mud and be limited; Then, will carry water under the buoyancy aid that solar power assembly and bed mud absorb releasing unit respectively; Satisfy in illuminance under the situation of predetermined value, on the one hand, the current drives electro-motor of solar energy photovoltaic panel output drives a whole set of sun power water quality improvement machine along guide rope direction back and forth movement between two contact switches; On the other hand, the electric current of solar energy photovoltaic panel output absorbs the running that discharges turbulence pump in the chamber by potentiostat, illuminance controller control bed mud.
Turbulence pump has two effects:
The one, the water movement that absorb to discharge inside, chamber by bed mud absorbs the cotton-shaped bed mud of water bottom and is applied to the water body top layer, utilize the oxygen enrichment water body on top layer, hazardous and noxious substances in the oxidation bed mud floss, and for the nitrifier in the active sludge and digestion bacterium etc. provide oxygen, basicity, materials such as nitrogen in the floc sludge, phosphorus, sulphur are transformed to the oxidation state form.
The 2nd, for absorbing the dispensing buoyancy aid, bed mud provides a reverse impellent, and second buoyancy aid is moved in water body, because the existence of union lever, second buoyancy aid is done the ring rotation motion around first buoyancy aid, bed mud that can the arbitrary position of adsorbed water body.
The illuminance controller is according to the electric current output of light conditions control solar energy photovoltaic panel, the turbulence pump that makes the water body bed mud absorb the dispensing chamber can only move under certain illuminance situation, do not move in the absence of sunlight, with guarantee bed mud illumination fully, be absorbed under the surface water oxygen level condition with higher and be applied to the water body top layer.
Experiment shows, the critical illuminance of the keying of illuminance controller can be set at 500lux, when illuminance reached 500lux, illuminance controller opens, the electric current of solar energy photovoltaic panel output were exported to the turbulence pump that bed mud absorbs the dispensing assembly after by the potentiostat stabilized voltage; When being lower than 500lux, the illuminance controller cuts out, and solar energy photovoltaic panel is outward current not, and bed mud absorbs releasing unit and do not work.
Further, buoyancy aid is made up of two ship shape injection moulding buoyancy aids arranged side by side respectively, is connected as a single entity by mounting bracket between the ship shape injection moulding buoyancy aid, and first buoyancy aid and second buoyancy aid are arranged vertically.Article two, the parallel construction of ship shape injection moulding buoyancy aid is conducive to keep the equilibrium of floating bodies.
Further again, solar energy photovoltaic panel is two 12v, the solar energy photovoltaic panel of 150w, be installed in respectively on the mounting bracket of two ship shape injection moulding buoyancy aid tops, potentiostat, illuminance controller, electro-motor and vertical guide frame are installed on two mounting brackets between the ship shape injection moulding buoyancy aid, are beneficial to keep first equilibrium of floating bodies.
Further again, bed mud absorption dispensing chamber is installed in the mounting bracket bottom between the ship shape injection moulding buoyancy aid, and it is parallel with ship shape injection moulding length of floating body direction that bed mud absorbs the axis that discharges the chamber, is beneficial to keep second equilibrium of floating bodies.
Further again, it is multi-stage type encasement tube structure that bed mud absorbs the dispensing chamber, is convenient to flexible and the control height.A kind of preferred structure is, bed mud is inhaled the dispensing chamber and is made up of 3 sections end to end straight pipelines, three's axis is positioned on the same vertical cross-section, first section straight pipeline is fixed on the mounting bracket bottom between the ship shape injection moulding buoyancy aid, and turbo-pump is installed in inside, first pipe joint road, and the axis of turbo-pump is parallel with first section straight pipeline axis, the entrance end of straight pipeline is beveled end, with water surface angle α in an acute angle, filter is installed, to prevent suctions such as branch, fishes and shrimps on the port.The exit end end face of first section straight length is vertical with the water surface, downward 90 degree of other straight pipeline exit end end face except first section straight pipeline are bent to parallel with the water surface, the exit end of back segment straight pipeline stretches in the leading portion straight pipeline entrance end, both bottoms are rotationally connected, other straight pipeline except first section straight pipeline can be around the connecting portion flip vertical, its maximum flip angle and α angle are complementary, and in the umklapp process, straight pipeline can be positioned on arbitrary upturned position.
Further again, union lever is preferably telescopic loop bar, comprise outer sleeve and be sleeved on the interior interior loop bar of outer sleeve, interior loop bar one end stretches out outside the outer sleeve, its outer sleeve one end first buoyancy aid that is rotationally connected, the external part of interior loop bar is by fixedly connected second buoyancy aid of dynamical element, and interior loop bar slides in outer sleeve under dynamical element promotes, and the collapsing length interval of loop bar is 1.0～3.0m.Second buoyancy aid is when first buoyancy aid rotates, and interior loop bar slides in outer sleeve under dynamical element promotes, and makes second buoyancy aid around the type rotation in the shape of a spiral of first buoyancy aid, guarantees that bed mud absorbs each corner that releasing unit can reach water body.
Further again, dynamical element can be electric hydaulic oil cylinder or craspedodrome motor.Dynamical element is driven by solar energy photovoltaic panel, after the output terminal of solar energy photovoltaic panel connects potentiostat and illuminance controller, connects dynamical element by pilot circuit.
Further again, the collar is two of arranged spaced, the central lines of two collars, and two ship shape injection moulding buoyancy aids of first buoyancy aid are about collar medullary ray left-right symmetry, and steering capability is better.
Further again, consider the common degree of depth of water body, the bottom floc sludge absorbs the flexible height in dispensing chamber between 0.3-1.5m.
Beneficial effect of the present invention is:
1) this sun power water quality improvement machine can be controlled the sediment of pond burst size according to illuminance.Sun power water quality improvement machine is according to the photosynthetic intensity of upper strata water body, and control bottom floc sludge is applied to the quantity on water body top layer, can guarantee that bed mud dispensing back is oxidized, can not make the excessive dispensing of bed mud cause water hypoxia and pollution again.
2) this sun power water quality improvement machine takes full advantage of oxygen that surface water photosynthesis produces etc. and satisfies the floc sludge needs, be conducive to promote organic decomposition such as ight soil, bait in the come-up bed mud, and provide nutritive substance for the planktonic organism in the water body, improve bottom material of pond for breeding thereby reach, regulate and control the effect of water quality, can improve recycling and the water body level of the productive forces of nutritive substance in the water body environment.
3) this sun power water quality improvement facility have light-operated, self-operating characteristics, and bed mud absorbs applicator can make the bed mud adsorption unit run to each corner of water body along the conductor rope spiral motion, makes the bed mud in the water body can both obtain handling.
Description of drawings
Fig. 1 is the travel position synoptic diagram of the present invention in water body
Fig. 2 is the part enlarged diagram of sun power water quality improvement machine among Fig. 1
Fig. 3 is the vertical view of Fig. 2
Fig. 4～6 absorb the different distressed structure synoptic diagram in dispensing chamber for bed mud
In Fig. 1～6: 1 is the solar power assembly, and 2 for bed mud absorbs the dispensing assembly, and 3 is first buoyancy aid, and 4 is second buoyancy aid, 5 is mounting bracket, and 6 is solar energy photovoltaic panel, and 7 is potentiostat, and 8 is the illuminance controller, 9 is electro-motor, and 10 is guide frame, and 11 is the collar, 12 is guide rope, and 13 is contact switch, and 14 are bed mud absorption dispensing chamber, section straight pipeline headed by 1401,1402 is the rear straight pipeline, 1403 is the middle straight pipeline, 15 is turbulence pump, and 16 is union lever, and 17 is dynamical element.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Sun power water quality improvement machine comprises that solar power assembly 1 and bed mud absorb dispensing assembly 2, and first buoyancy aid 3 and second buoyancy aid 4 that are respectively applied to carry two assemblies, connect by union lever 16 between two buoyancy aids 3,4, each buoyancy aid 3,4 comprises two ship shape injection moulding buoyancy aids arranged side by side, be connected as a single entity by mounting bracket 5 between the ship shape injection moulding buoyancy aid, first buoyancy aid 3 and second buoyancy aid 4 are arranged vertically mutually.
Solar power assembly 1 comprises solar energy photovoltaic panel 6, potentiostat 7, illuminance controller 8, electro-motor 9 and the vertical guide frame 10 that is installed on first buoyancy aid 3; Potentiostat 7, illuminance controller 8, electro-motor 9 and vertical guide frame 10 are installed on the mounting bracket 5 between two ship shape injection moulding buoyancy aids of first buoyancy aid 3.
Solar energy photovoltaic panel 6 is two 12v, and the solar energy photovoltaic panel of 150w is installed in respectively on the mounting bracket 5 of two ship shape injection moulding buoyancy aid tops.
Bed mud absorbs dispensing assembly 2 and comprises that bed mud absorbs dispensing chamber 14 and turbulence pump 15.Bed mud absorbs the dispensing chamber and is positioned at water surface below, parallel with the water surface and the close water surface of its exit end, and its entrance end port stretches to water bottom downwards, near the bed mud surface.
Bed mud absorbs dispensing chamber 14 by 3 sections end to end straight pipelines 1401,1402,1403 form, three's axis is positioned on the same vertical cross-section, first section straight pipeline 1401 is fixed on mounting bracket 5 bottoms between the ship shape injection moulding buoyancy aid, turbo-pump 15 is installed in 1401 inside, first pipe joint road, and the axis of turbo-pump 15 is parallel with first section straight pipeline 1401 axis. Straight pipeline 1401,1402 and 1403 entrance end are beveled end, with water surface angle α in an acute angle, filter are installed, to prevent suctions such as branch, fishes and shrimps on the port.
The exit end end face of first section straight length 1401 is vertical with the water surface, and it is parallel with the water surface that downward 90 degree of other straight pipeline 1402 except first section straight pipeline 1401,1403 exit end are bent to end face,
The exit end of back segment straight pipeline stretches in the leading portion straight pipeline entrance end, both bottoms are rotationally connected, straight pipeline 1402,1403 can be around the connecting portion flip vertical, its maximum flip angle and α angle are complementary, in the umklapp process, straight pipeline 1402,1403 can be positioned on arbitrary upturned position, shown in Fig. 4～6.
The electric current of the output of solar energy photovoltaic panel 6 passes through independently circuit control electro-motor 9, turbulence pump 15 and dynamical element 17 afterwards, respectively by potentiostat 7 and illuminance controller 8.
During concrete operations, at first, adjust bed mud according to the actual water surface elevation of water pollution and absorb the whole height that discharges chamber 14, the water body height of itself and water body is complementary, as shown in Figure 6; Then, guide rope 12 is penetrated in the collar 11, the guide rope two ends are fixed on the ridge, water body slope, and at guide rope contact switch is installed, when the installation site of contact switch is moved between two contact switches with the sun power water improving machine, do not interfere with the sloping ridge and bed mud and be limited; Then, with water under first buoyancy aid 3 and second buoyancy aid; Under the situation of illuminance more than or equal to 500lux, on the one hand, the current drives electro-motor 9 of solar energy photovoltaic panel 6 outputs drives a whole set of sun power water quality improvement machine along guide rope 11 back and forth movement between two contact switches 13; On the other hand, the electric current of solar energy photovoltaic panel 6 outputs flows to turbulence pumps 15 runnings in the bed mud absorption dispensing chamber 14.
The one, the water movement that absorbs dispensing 14 inside, chamber by bed mud absorbs the cotton-shaped bed mud of water bottom and is applied to the water body top layer, utilize the oxygen enrichment water body on top layer, hazardous and noxious substances in the oxidation bed mud floss, and for the nitrated bacterium colony in the active sludge and digestion bacterium colony etc. provide oxygen, basicity, materials such as nitrogen in the floc sludge, phosphorus, sulphur are transformed to the oxidation state form.
The 2nd, for second buoyancy aid 4 provides a reverse impellent, second buoyancy aid 4 is moved in water body, because the existence of telescopic union lever 16, the solar power assembly buoyancy aid that centers on of second buoyancy aid 2 is made spiralling, and the entrance end that can make bed mud absorb dispensing chamber 14 covers each corner of water bottom.
Claims (10)
1. a sun power water quality improves machine, it is characterized in that:
Described sun power water quality improvement machine comprises that solar power assembly (1) and bottom floc sludge absorb dispensing assembly (2), and be respectively applied to carry first buoyancy aid (3) of solar power assembly and second buoyancy aid (4) that the bottom floc sludge absorbs the dispensing assembly, two buoyancy aids (3,4) connect as one by union lever (16) between, wherein:
Solar power assembly (1) is made up of the electro-motor (9) that is installed in solar energy photovoltaic panel (6) on first buoyancy aid (3), potentiostat (7), illuminance controller (8), vertical guide frame (10) and is used for driving first buoyancy aid (3),
Guide frame (10) is gone up retaining collar (11), the collar (11) is positioned at the top of first buoyancy aid (3), penetrate guide rope (12) in the collar (11), its two ends are separately fixed on the sloping ridge of water body both sides, guide rope (12) is gone up 2 contact switches (13) is installed at interval, contact switch (13) is connected with electro-motor (9) signal, guide rope (12) back and forth movement that first buoyancy aid (3) can be between 2 contact switches in water surface upper edge (13);
The bottom floc sludge absorbs dispensing assembly (2) to be made up of bed mud absorption dispensing chamber (14) and turbulence pump (15),
It is the microscler pipeline of scalable bending that bed mud absorbs dispensing chamber (14), bed mud absorbs dispensing chamber (14) and is installed in bed mud absorption dispensing second buoyancy aid (4) bottom, is positioned at water surface below, parallel with the water surface and the close water surface of its exit end, turbulence pump (15) is installed in the exit end inboard, bed mud absorbs its entrance end port of dispensing chamber (14) and stretches to the cultivating pool bottom downwards, near the bed mud surface;
Union lever (16) one ends and first buoyancy aid (3) are rotationally connected, and an end is fixedlyed connected with second buoyancy aid (4), and union lever (16) and second buoyancy aid (4) can horizontally rotate around first buoyancy aid (3);
The output terminal of solar energy photovoltaic panel (6) connects potentiostat (7) and illuminance controller (8) afterwards, be connected electro-motor (9) and turbulence pump (15) respectively by separate pilot circuit again.
2. a kind of sun power water quality according to claim 1 improves machine, it is characterized in that: buoyancy aid (3,4) be made up of two ship shape injection moulding buoyancy aids arranged side by side respectively, be connected as a single entity by mounting bracket (5) between the ship shape injection moulding buoyancy aid, first buoyancy aid (3) and second buoyancy aid (4) are arranged vertically.
3. a kind of sun power water quality according to claim 2 improves machine, it is characterized in that: described solar energy photovoltaic panel (6) is two 12v, the solar energy photovoltaic panel of 150w, be installed in respectively on the mounting bracket (5) of two ship shape injection moulding buoyancy aid tops, potentiostat (7), illuminance controller (8), electro-motor (9) and vertical guide frame (10) are installed on two mounting brackets (5) between the ship shape injection moulding buoyancy aid.
4. a kind of sun power water quality according to claim 2 improves machine, it is characterized in that: described bed mud absorption dispensing chamber (14) is installed in mounting bracket (5) bottom between the ship shape injection moulding buoyancy aid, and it is parallel with ship shape injection moulding length of floating body direction that bed mud absorbs the axis that discharges chamber (14).
5. a kind of sun power water quality according to claim 4 improves machine, it is characterized in that:
Described bed mud absorbs dispensing chamber (14) to be made up of 3 sections end to end straight pipelines (1401,1402,1403), and three's axis is positioned on the same vertical cross-section,
First section straight pipeline (1401) is fixed on mounting bracket (5) bottom between the ship shape injection moulding buoyancy aid, turbo-pump (15) is installed in inside, first pipe joint road (1401), the axis of turbo-pump (15) is parallel with first section straight pipeline (1401) axis, straight pipeline (1401,1402,1403) entrance end is beveled end, with water surface angle α in an acute angle, filter is installed on the port
The exit end end face of first section straight length (1401) is vertical with the water surface, and it is parallel with the water surface that downward 90 degree of other straight pipeline (1402,1403) the exit end end face except first section straight pipeline (1401) are bent to end face,
The exit end of back segment straight pipeline stretches in the leading portion straight pipeline entrance end, both bottoms are rotationally connected, other straight pipeline (1402 except first section straight pipeline (1401), 1403) can be around the connecting portion flip vertical, its maximum flip angle and α angle are complementary, in the umklapp process, straight pipeline (1402,1403) can be positioned on arbitrary upturned position.
6. a kind of sun power water quality according to claim 1 improves machine, it is characterized in that: described union lever (16) is telescopic loop bar, comprise outer sleeve and be sleeved on the interior interior loop bar of outer sleeve, interior loop bar one end stretches out outside the outer sleeve, its outer sleeve one end first buoyancy aid (3) that is rotationally connected, the external part of interior loop bar is by fixedly connected second buoyancy aid of dynamical element (17) (4), and interior loop bar slides in outer sleeve under dynamical element (7) promotes.
7. a kind of sun power water quality according to claim 6 improves machine, and it is characterized in that: described dynamical element (17) is electric hydaulic oil cylinder or direct-current machine.
8. a kind of sun power water quality improvement machine according to claim 6 is characterized in that: after the output terminal of described solar energy photovoltaic panel (6) connects potentiostat (7) and illuminance controller (8), connect dynamical element (17) by pilot circuit.
9. a kind of sun power water quality according to claim 1 improves machine, it is characterized in that: the described collar (11) is two of arranged spaced, the central lines of two collars (11), two ship shape injection moulding buoyancy aids of first buoyancy aid (3) are about the collar (11) medullary ray left-right symmetry.
10. a kind of sun power water quality according to claim 1 improves machine, it is characterized in that: described bed mud absorbs the flexible height in dispensing chamber (14) between 0.3-1.5m.
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| CN103570146B (en) * | 2013-11-13 | 2015-03-18 | 中国水产科学研究院渔业机械仪器研究所 | Solar movable water layer exchange and oxygenation device |
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| KR101049005B1 (en) * | 2002-12-31 | 2011-07-12 | 메도라 인바이런멘탈, 인코포레이티드 | Water circulation system for ponds, lakes and other bodies of water |
| WO2011003438A1 (en) * | 2009-07-06 | 2011-01-13 | Damen Dredging Equipment B.V. | A dredge vessel system for deep-sea dredging |
| CN202717603U (en) * | 2012-07-18 | 2013-02-06 | 中国水产科学研究院渔业机械仪器研究所 | Solar water quality improving machine |
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