CN108585376B - Water treatment system for recycling heat of mariculture wastewater - Google Patents
Water treatment system for recycling heat of mariculture wastewater Download PDFInfo
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- 238000004064 recycling Methods 0.000 title abstract description 7
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/02—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the heat-exchange media travelling at an angle to one another
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
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- Hydrology & Water Resources (AREA)
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Abstract
The invention provides a water treatment system for recycling mariculture wastewater through heat circulation. The water treatment system includes: a water supply device, a heat cycle recovery device, a primary filtering device, a sedimentation tank, a post-stage filtering device, an activated sludge treatment tank and an ultraviolet irradiation treatment device. Through the implementation mode of the invention, the energy consumption can be reduced, and the mariculture wastewater can be treated, thereby avoiding the environmental pollution.
Description
Technical Field
The invention relates to a water treatment system, in particular to a water treatment system for recycling heat of mariculture wastewater.
Background
Mariculture is an agricultural production mode for artificially raising and propagating marine economic animals and plants in offshore sea areas such as shallow sea, tidal flat, estuary and pond. With the increase of the mariculture area, unreasonable culture modes of the mariculture industry and a great amount of pollution generated in the production process become one of important causes of offshore pollution. Mariculture pollution refers to negative effects of hindering culture production activities, damaging use conditions of fishery water areas, damaging fishery resources, damaging marine ecological environment and the like caused by various behaviors of human beings in the process of using seawater to culture aquatic products.
The marine ecosystem is a system which is not controlled by human beings and naturally adjusts balance, has certain self-cleaning capacity, but breaks the balance of the system when the human activities are excessively disturbed. Seawater aquaculture mainly depends on artificial regulation to maintain the ecological balance of the system, and once the food chain and species diversity are destroyed, a series of abnormal manifestations are caused. The discharge of a large amount of culture wastewater rich in nitrogen and phosphorus nutrients is one of the important reasons for seawater eutrophication. Discharge of excess or untreated sewage can directly affect the quality of the seawater surrounding the offshore aquaculture sea, thereby affecting the ecological balance thereof.
The traditional water treatment method of mariculture wastewater is to directly discharge the mariculture wastewater into seawater. Therefore, the pollutants formed by the residual feed and the fish excrement in the seawater aquaculture process cause the self-pollution of the water body and the deterioration of the water quality, and the phenomena are as follows: the water body is seriously eutrophicated, the suspended matters in the water body are increased, the content of biological oxygen demand, chemical oxygen demand, nitrite nitrogen and the like is increased, and the dissolved oxygen is reduced.
In addition, in mariculture, the marine economic animals and plants are usually suitable for breeding at a certain temperature, so that a certain seawater temperature needs to be maintained, and a large amount of energy is needed for adjusting the seawater temperature.
Therefore, there is an urgent need for a water treatment system for mariculture wastewater, which can reduce energy consumption and can treat the mariculture wastewater to avoid environmental pollution.
Disclosure of Invention
At least one technical problem to be solved by some embodiments of the present invention is to provide a water treatment system for mariculture wastewater, which can solve the technical problems.
In some embodiments, a water treatment system for thermal recycling of mariculture wastewater is provided, wherein the water treatment system comprises: a water supply device for providing mariculture wastewater; a heat cycle recovery device including two-way passages isolated from each other by a partition plate but capable of heat transfer through the partition plate, the wastewater and the exogenous seawater supplied from the water supply device respectively flowing in reverse directions in the two-way passages and performing heat exchange through the partition plate such that a temperature of the exogenous seawater approaches a desired temperature; a primary filtering device including a plurality of stages of filtering nets to filter coarse suspended substances or impurities in the wastewater supplied from the heat cycle recovery device; the opening of the sedimentation tank is gradually reduced from high to low, a plurality of arc-shaped protrusions are arranged on the side wall of the sedimentation tank, and the heights of the arc-shaped protrusions are sequentially increased along the direction from high to low of the side wall; the rear-stage filtering device comprises a suspended particle coarse interception layer and a suspended particle fine interception layer; an activated sludge treatment tank including activated sludge for purifying sewage, which is a generic name of flocculent sludge including microbial populations of bacteria, zoogles, protozoa, metazoa, and adsorbed organic and inorganic substances in sewage, and an activated sludge throwing device for throwing a predetermined amount of activated sludge when an insufficient amount of activated sludge is detected; and an ultraviolet irradiation processing device including a plurality of straight tube-shaped quartz ultraviolet low-pressure mercury lamps arranged in an array, each of the straight tube-shaped quartz ultraviolet low-pressure mercury lamps having an ultraviolet irradiation power of 10 to 35 w.
In some embodiments, the two-way passage is provided in the form of a coil.
In some embodiments, the exogenous seawater provided from the thermal cycle recovery device is reprocessed to a desired temperature for nutrient use.
In some embodiments, a plurality of bleed openings are provided in the arcuate projections.
In some embodiments, the coarse suspended particle interception layer comprises 5-9 porous material layers arranged in an overlapping manner, and the porous material layers are configured to be replaceable.
In some embodiments, the fine suspended particle intercepting layer comprises a polypropylene particle layer, and polypropylene particles in the polypropylene particle layer can randomly move under the action of the water flow so as to intercept the suspended particles in the water flow.
In some embodiments, the separation distance between the suspended particle coarse interception layer and the suspended particle fine interception layer is 45 to 70 cm.
In some embodiments, the post-stage filtration device further comprises a three-dimensional mesh bio-filler layer with a biofilm attached to the surface.
In some embodiments, the position, the number, and the irradiation time of the straight tube quartz ultraviolet low-pressure mercury lamp that emits light are set based on the water quality and the flow rate of the wastewater.
In some embodiments, the multi-stage filter screen comprises a plurality of grates having progressively smaller openings.
In some embodiments, the angle of inclination of the grates is different, each grate angle of inclination being between 60-80 °.
In some embodiments, the power for the ultraviolet radiation treatment device is from wind energy or solar energy.
In some embodiments, the plurality of arc-like protrusions are connected to each other to form an integral protrusion on the side wall of the settling tank that descends helically around the side wall.
In some embodiments, the activated sludge treatment tank includes a diversion wall and a diversion channel at an inlet of the activated sludge treatment tank, the diversion wall having a structure recessed toward an inside of the activated sludge treatment tank, and the diversion wall includes a plurality of diversion openings provided thereon for guiding wastewater into the respective diversion channels, each diversion channel having a meandering shape and communicating with each other to form a net-like diversion network to increase a contact area of wastewater with the activated sludge.
In some embodiments, the settling pond comprises a first settling pond and a second settling pond which are connected in sequence, the bottom of the first settling pond is higher than the bottom of the second settling pond, the height of the bottom of the first settling pond is gradually reduced from a water inlet to a water outlet, a buffering retaining wall is arranged at the water outlet of the first settling pond and used for slowing down the flow speed of wastewater entering the second settling pond, and the first settling pond and the second settling pond are connected in a configuration that wastewater flows in the second settling pond in a direction opposite to the flow direction in the first settling pond; and arranging a pressure relief pool near the water outlet of the second sedimentation pool, wherein the pressure relief pool has the depth of 2-3m, and arranging a drain pipe communicated with the outside at the bottom of the pressure relief pool so as to open and discharge the wastewater when the pressure of the wastewater exceeds a preset threshold value.
At least one benefit of some embodiments of the invention is that: can reduce energy consumption, and can treat the mariculture wastewater to avoid environmental pollution.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
Drawings
The above and other features of the present invention will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only several embodiments in accordance with the invention and are not therefore to be considered to be limiting of its scope, the invention will be described with additional specificity and detail through use of the accompanying drawings.
FIG. 1 is a schematic view of a water treatment system for heat cycle recovery of mariculture wastewater provided by the present invention.
Detailed Description
Reference will now be made to the accompanying drawings for further description.
FIG. 1 shows a schematic diagram of a water treatment system for thermal recycling of mariculture wastewater provided by the present invention.
Referring to FIG. 1, in some embodiments, the present invention provides a water treatment system for thermal recycling of mariculture wastewater, wherein the water treatment system comprises: a water supply device 101, wherein the water supply device 101 is used for providing mariculture wastewater; a heat cycle recovery device 102, the heat cycle recovery device 102 including two passages isolated from each other by a partition plate but capable of heat transfer through the partition plate, the wastewater and the exogenous seawater supplied from the water supply device 101 respectively flowing in reverse directions in the two passages and performing heat exchange through the partition plate such that the temperature of the exogenous seawater approaches a desired temperature; a primary filtering device 103 including a plurality of stages of filtering nets to filter coarse suspended substances or impurities in the wastewater supplied from the heat cycle recovery device; a sedimentation tank 104, the opening of the sedimentation tank 104 is gradually reduced from high to low, a plurality of arc-shaped protrusions are arranged on the side wall of the sedimentation tank 104, and the heights of the arc-shaped protrusions are sequentially increased along the direction from high to low of the side wall; a post-stage filtration device 105, the post-stage filtration device 105 comprising a suspended particle coarse interception layer and a suspended particle fine interception layer; an activated sludge treatment tank 106, the activated sludge treatment tank 106 including activated sludge for purifying sewage, which is a generic name of flocculent sludge including microbial populations of bacteria, zoogles, protozoa, metazoa, and adsorbed organic and inorganic substances in sewage, and an activated sludge throwing device for throwing a predetermined amount of activated sludge when an insufficient amount of activated sludge is detected; and an ultraviolet irradiation processing device 107, the ultraviolet irradiation processing device 107 comprising a plurality of straight tube-shaped quartz ultraviolet low-pressure mercury lamps arranged in an array, each of the straight tube-shaped quartz ultraviolet low-pressure mercury lamps having an ultraviolet irradiation power of 10 to 35 w.
The seawater culture wastewater heat cycle recovery water treatment system provided by the invention can comprehensively treat the seawater culture wastewater by utilizing the primary filtering device, the heat cycle recovery device, the sedimentation tank, the post-stage filtering device, the activated sludge treatment tank and the ultraviolet irradiation treatment device, and reduces the direct discharge of the seawater culture wastewater, thereby avoiding the pollution to seawater. Particularly, the heat circulation recovery device is arranged, so that the temperature of the exogenous seawater can be adjusted by utilizing the mariculture wastewater, for example, the temperature of the exogenous seawater can be reduced, the energy can be recycled, and the energy consumption can be reduced. In addition, the side wall of the sedimentation tank comprises a plurality of arc-shaped protrusions, and the heights of the arc-shaped protrusions are sequentially increased from high to low along the side wall, so that the water flow can be slowed down, and sedimentation of suspended substances in the wastewater is facilitated.
In some embodiments, the two-way passage is provided in the form of a coil. The coil form can achieve the full contact of two paths of channels, thereby more effectively improving the efficiency of the heat cycle recovery of the mariculture wastewater.
In some embodiments, the exogenous seawater provided from the thermal cycle recovery device is reprocessed to a desired temperature for nutrient use. Here, the temperature of the exogenous seawater can be lowered by the mariculture wastewater and also raised by the mariculture wastewater, depending on the farmed organisms and the farming method.
In some embodiments, a plurality of bleed openings are provided in the arcuate projections. When the water flow is relatively quick, suspended substances in the wastewater are difficult to precipitate. However, the plurality of drainage holes provided in the arc-shaped protrusion can further reduce the water flow speed, which is more favorable for the precipitation of suspended substances in the wastewater.
In some embodiments, the coarse suspended particle interception layer comprises 5-9 porous material layers arranged in an overlapping manner, and the porous material layers are configured to be replaceable. In some embodiments, the fine suspended particle intercepting layer comprises a polypropylene particle layer, and polypropylene particles in the polypropylene particle layer can randomly move under the action of the water flow so as to intercept the suspended particles in the water flow. In some embodiments, the separation distance between the suspended particle coarse interception layer and the suspended particle fine interception layer is 45 to 70 cm. In some embodiments, the post-stage filtration device further comprises a three-dimensional mesh bio-filler layer with a biofilm attached to the surface.
According to the invention, the suspended particles in the wastewater can be effectively intercepted by utilizing the suspended particle coarse intercepting layer and the suspended particle fine intercepting layer. In particular, the collision and friction of the polypropylene particles in random motion can effectively adsorb and aggregate suspended particles. And the spacing distance between the suspended particle coarse interception layer and the suspended particle fine interception layer is 45-70cm, and the spacing distance is most effective for intercepting suspended particles in the range. In addition, the invention also adopts a three-dimensional net-shaped biological filler layer with a biomembrane attached on the surface, and the biomembrane can particularly decompose organic matters in the mariculture wastewater, thereby being beneficial to the water treatment of the mariculture wastewater.
In some embodiments, the position, the number, and the irradiation time of the straight tube quartz ultraviolet low-pressure mercury lamp that emits light are set based on the water quality and the flow rate of the wastewater. The aquaculture wastewater is not supplied continuously, and the components of different aquaculture wastewater are different. Therefore, the present invention can reduce energy consumption by setting the position, number, and irradiation time of the light-emitting straight tube type quartz ultraviolet low-pressure mercury lamps based on the water quality and flow rate of wastewater.
In some embodiments, the multi-stage filter screen comprises a plurality of grates having progressively smaller openings. In some embodiments, the angle of inclination of the grates is different, each grate angle of inclination being between 60-80 °.
In some embodiments, the power for the ultraviolet radiation treatment device is from wind energy or solar energy. The solar energy and wind energy combined wind power generation device is driven by clean wind energy or solar energy, so that the environment is more protected, and the energy consumption is reduced.
In some embodiments, the plurality of arc-like protrusions are connected to each other to form an integral protrusion on the side wall of the settling tank that descends helically around the side wall. In the present invention, by providing the entire protrusion spirally descending around the side wall, the waste water can be made to travel along the spiral protrusion, thereby further reducing the water flow speed.
In some embodiments, the activated sludge treatment tank includes a diversion wall and a diversion channel at an inlet of the activated sludge treatment tank, the diversion wall having a structure recessed toward an inside of the activated sludge treatment tank, and the diversion wall includes a plurality of diversion openings provided thereon for guiding wastewater into the respective diversion channels, each diversion channel having a meandering shape and communicating with each other to form a net-like diversion network to increase a contact area of wastewater with the activated sludge.
In the invention, the flow dividing wall sunken towards the inside of the activated sludge treatment tank can ensure that the water flow speed entering each flow dividing opening of the flow dividing wall is basically consistent. The zigzag-shaped and mutually communicated net-shaped flow distribution channels greatly increase the contact area of the wastewater and the activated sludge, thereby improving the purification effect.
In some embodiments, the settling pond comprises a first settling pond and a second settling pond which are connected in sequence, the bottom of the first settling pond is higher than the bottom of the second settling pond, the height of the bottom of the first settling pond is gradually reduced from a water inlet to a water outlet, a buffering retaining wall is arranged at the water outlet of the first settling pond and used for slowing down the flow speed of wastewater entering the second settling pond, and the first settling pond and the second settling pond are connected in a configuration that wastewater flows in the second settling pond in a direction opposite to the flow direction in the first settling pond; and arranging a pressure relief pool near the water outlet of the second sedimentation pool, wherein the pressure relief pool has the depth of 2-3m, and arranging a drain pipe communicated with the outside at the bottom of the pressure relief pool so as to open and discharge the wastewater when the pressure of the wastewater exceeds a preset threshold value.
In the invention, the connection configuration of the buffering retaining wall and the first sedimentation tank and the second sedimentation tank is cooperated, so that the water flow speed of the wastewater can be controlled, and the sedimentation is facilitated. In addition, by arranging the pressure relief pool with the depth of 2-3m, the bottom of the pressure relief pool bears the water pressure of the sum of the depths of the pressure relief pool and the second sedimentation pool, and when the pressure of the waste water exceeds a preset threshold value, a drain pipe can be automatically opened to discharge the waste water.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes and modifications can be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitution patterns, so long as the technical principle and inventive concept of the system for treating seawater culture wastewater by heat cycle recovery of the present invention are met, and the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. Mariculture waste water thermal cycle retrieves water treatment system, its characterized in that, water treatment system includes:
a water supply device for providing mariculture wastewater;
a heat cycle recovery device including two-way passages isolated from each other by a partition plate but capable of heat transfer through the partition plate, the wastewater and the exogenous seawater supplied from the water supply device respectively flowing in reverse directions in the two-way passages and performing heat exchange through the partition plate such that a temperature of the exogenous seawater approaches a desired temperature;
a primary filtering device including a plurality of stages of filtering nets to filter impurities in the wastewater provided from the heat cycle recovery device;
a settling tank, the opening of which is gradually reduced from high to low, comprising a plurality of arc-shaped protrusions on the side wall of the settling tank, and the heights of the arc-shaped protrusions are sequentially increased from high to low along the side wall, wherein a plurality of water drainage holes are provided in the arc-shaped protrusions to slow down the water flow speed, thereby settling suspended substances in the wastewater, wherein the settling tank comprises a first settling tank and a second settling tank which are sequentially connected, the bottom of the first settling tank is higher than the bottom of the second settling tank, and the height of the bottom of the first settling tank is gradually reduced in the direction from the water inlet to the water outlet, a buffering retaining wall is provided at the water outlet of the first settling tank, the buffering retaining wall is used for slowing down the flow speed of the wastewater entering the second settling tank, and the first settling tank and the second settling tank are connected in a configuration such that the wastewater flows in the direction opposite to the flow direction in the first settling tank at the second settling tank Flowing in a sedimentation tank; arranging a pressure relief pool near a water outlet of the second sedimentation pool, wherein the pressure relief pool has the depth of 2-3m, and arranging a drain pipe communicated with the outside at the bottom of the pressure relief pool so as to open and discharge the wastewater when the pressure of the wastewater exceeds a preset threshold;
the rear-stage filtering device comprises a suspended particle coarse interception layer and a suspended particle fine interception layer;
an activated sludge treatment tank including activated sludge for purifying sewage and an activated sludge throwing device for throwing a predetermined amount of activated sludge when an insufficient amount of activated sludge is detected, wherein the activated sludge treatment tank includes a diversion wall and a diversion passage at an inlet of the activated sludge treatment tank, the diversion wall having a structure recessed toward an inside of the activated sludge treatment tank, and the diversion wall includes a plurality of diversion openings provided thereon for guiding wastewater into the respective diversion passages, each diversion passage having a zigzag shape and communicating with each other to form a net-like diversion network to increase a contact area of wastewater with the activated sludge; and
an ultraviolet irradiation treatment apparatus comprising a plurality of straight tube-shaped quartz ultraviolet low-pressure mercury lamps arranged in an array, each of the straight tube-shaped quartz ultraviolet low-pressure mercury lamps having an ultraviolet irradiation power of 10 to 35 w.
2. The water treatment system of claim 1 wherein the two-way passage is provided in the form of a coil.
3. The water treatment system of claim 2, wherein the exogenous seawater provided from the thermal cycle recovery device is reprocessed to a desired temperature for nutrient use.
4. The water treatment system of claim 1, wherein the coarse suspended particle interception layer comprises 5-9 porous material layers arranged in an overlapping manner, and the porous material layers are configured to be replaceable.
5. The water treatment system of claim 4, wherein the fine suspended particle intercepting layer comprises a polypropylene particle layer, and polypropylene particles in the polypropylene particle layer can randomly move under the action of the water flow to intercept the suspended particles in the water flow.
6. The water treatment system of claim 5, wherein the post-stage filtration device further comprises a layer of three-dimensional mesh bio-filler with a biofilm attached to the surface.
7. The water treatment system according to claim 6, wherein the position, the number and the irradiation time of the straight tube type quartz ultraviolet low-pressure mercury lamp that emits light are set based on the water quality and the flow rate of the wastewater.
8. The water treatment system of claim 7, wherein the multi-stage filter screen includes a plurality of grates having progressively smaller openings.
9. The water treatment system of claim 8 wherein the angle of inclination of the grates is different, each grate angle of inclination being between 60-80 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810491074.8A CN108585376B (en) | 2018-05-21 | 2018-05-21 | Water treatment system for recycling heat of mariculture wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810491074.8A CN108585376B (en) | 2018-05-21 | 2018-05-21 | Water treatment system for recycling heat of mariculture wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108585376A CN108585376A (en) | 2018-09-28 |
| CN108585376B true CN108585376B (en) | 2021-04-27 |
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