CN113880362A - Combined process device for treating mariculture wastewater by ultrasonic stripping-suspended packed bed-membrane distillation reactor and treatment method thereof - Google Patents

Combined process device for treating mariculture wastewater by ultrasonic stripping-suspended packed bed-membrane distillation reactor and treatment method thereof Download PDF

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CN113880362A
CN113880362A CN202111258149.6A CN202111258149A CN113880362A CN 113880362 A CN113880362 A CN 113880362A CN 202111258149 A CN202111258149 A CN 202111258149A CN 113880362 A CN113880362 A CN 113880362A
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tank
ultrasonic
membrane distillation
distillation reactor
water
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刘畅
纪荣平
其他发明人请求不公开姓名
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Yangzhou University
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Yangzhou University
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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
    • 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
    • C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
    • C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • 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
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment

Abstract

The invention relates to a combined process device for treating mariculture wastewater by using an ultrasonic stripping-suspended packed bed-membrane distillation reactor and a treatment method thereof, wherein the combined process device comprises an ultrasonic liquid storage tank, an anaerobic tank, an aerobic tank, a sedimentation tank, a heating tank, a membrane distillation reactor, a water purification tank, an ultrasonic system control computer and a solar panel; a plurality of ultrasonic rods are uniformly distributed in the ultrasonic liquid storage tank; the ultrasonic liquid storage tank is communicated with the anaerobic tank through a first pipeline, a first circulating pump and a first gate valve are arranged on the first pipeline between the ultrasonic liquid storage tank and the anaerobic tank, and the first circulating pump is positioned between the ultrasonic liquid storage tank and the first gate valve; according to the invention, the organic matters in the mariculture wastewater are subjected to ultrasonic treatment, and the ammonia nitrogen with poor removal effect is pretreated by using the suspension packed bed, so that the organic matter deposition on the membrane surface is greatly reduced, the service life of the membrane is prolonged, and the effluent quality is improved.

Description

Combined process device for treating mariculture wastewater by ultrasonic stripping-suspended packed bed-membrane distillation reactor and treatment method thereof
Technical Field
The invention relates to a combined process device for treating mariculture wastewater by using an ultrasonic stripping-suspended packed bed-membrane distillation reactor and a treatment method thereof, belonging to the technical field of sewage treatment in the environmental engineering discipline.
Background
With the rapid development of the marine aquaculture industry in China, the export quantity of aquaculture has leaped the top of the world. However, the pollutants in the discharged water are seriously out of standard due to large-scale cultivation and irregular feeding modes. The mariculture wastewater mainly contains pollutants such as ammonia nitrogen, nitrite, nitrate, phosphate, chloride, organic matters and the like, and has the problems of high salinity, large discharge amount, less professional treatment technology with strong pertinence, incapability of directly utilizing the freshwater culture wastewater treatment technology and the like.
In recent years, the application of membrane distillation technology in water treatment is gradually emphasized, membrane distillation is a membrane separation process combining the membrane technology and a distillation process, a hydrophobic microporous membrane is used as a medium, and volatile components in feed liquid permeate membrane pores in a steam form under the action of steam pressure difference on two sides of the membrane, so that the separation purpose is realized. The membrane distillation process is almost carried out under normal pressure, the equipment is simple, the operation is convenient, and the membrane distillation process has the possibility of being realized in an area with weak technical strength; in the membrane distillation process of the non-volatile solute aqueous solution, only water vapor can permeate through the membrane pores, so that the distillate is pure and is expected to become an effective means for preparing ultrapure water in a large scale and at low cost; the membrane distillation module is easily designed into a latent heat recovery form and has the flexibility to construct a large-scale production system with efficient small-scale membrane modules; the process can be carried out without heating the solution to the boiling point as long as the proper temperature difference is maintained between the two sides of the membrane, and cheap energy sources such as solar energy, geothermal energy, hot springs, waste heat of factories, warm industrial wastewater and the like can be utilized. However, the following disadvantages inevitably occur: the permeation flux of membrane distillation is small; for volatile pollutant water solution, the membrane distillation treatment effect is poor; the problem of membrane surface contamination is a major obstacle to its widespread use.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the problems in the prior art, and the invention aims to provide the combined process device for treating the mariculture wastewater by the ultrasonic stripping-suspension packed bed-membrane distillation reactor and the treatment method thereof. On the other hand, on the premise of ensuring the effect of removing the pollutants, the pretreatment device at the front end of the membrane distillation reactor can also delay the deposition of the pollutants on the membrane surface, prolong the operation period, prolong the service life of the membrane in the reactor and increase the permeation flux of the membrane.
The invention aims to realize the combined process device for treating the mariculture wastewater by using the ultrasonic stripping-suspended packed bed-membrane distillation reactor, which is characterized by comprising an ultrasonic liquid storage tank, an anaerobic tank, an aerobic tank, a sedimentation tank, a heating tank, a membrane distillation reactor, a water purification tank, an ultrasonic system control computer and a solar panel, wherein the membrane distillation reactor is provided with a left cavity and a right cavity, and membrane components are arranged between the left cavity and the right cavity and are separated by the membrane components;
a plurality of ultrasonic bars are uniformly distributed in the ultrasonic liquid storage tank, the ultrasonic system control computer is connected with the ultrasonic bars in the ultrasonic liquid storage tank and used for controlling the ultrasonic bars, and ultrasonic generators are arranged on the side walls of the ultrasonic bars; the anaerobic tank and the aerobic tank are internally provided with suspended filler balls, and the bottom of the aerobic tank is provided with an aeration head; a heating rod is arranged in the sedimentation tank, the solar panel is connected with the heating rod through a power supply pipeline, and a power converter is arranged on the power supply pipeline between the solar panel and the heating rod and used for supplying power to the heating rod arranged in the sedimentation tank;
the ultrasonic liquid storage tank is communicated with the anaerobic tank through a first pipeline, a first circulating pump and a first gate valve are arranged on the first pipeline between the ultrasonic liquid storage tank and the anaerobic tank, and the first circulating pump is positioned between the ultrasonic liquid storage tank and the first gate valve; the anaerobic tank is communicated with the aerobic tank, and the communicated part is positioned at the lower parts of the anaerobic tank and the aerobic tank;
the aerobic tank, the sedimentation tank and the heating tank are sequentially communicated, the communicated part of the aerobic tank and the sedimentation tank is positioned at the upper parts of the aerobic tank and the sedimentation tank, the communicated part of the sedimentation tank and the heating tank is positioned at the upper parts of the sedimentation tank and the heating tank, the heating tank is communicated with a water inlet of a left cavity of the membrane distillation reactor through a second pipeline, a second circulating pump and a second gate valve are arranged on the second pipeline between the heating tank and the membrane distillation reactor, and the second circulating pump is positioned between the heating tank and the second gate valve; a water outlet of the left chamber of the membrane distillation reactor is communicated with a water inlet of the heating pool through a fourth pipeline to form a circulation loop;
the water purifying tank is connected with a water inlet of a right cavity of the membrane distillation reactor through a third pipeline, and a water outlet of the right cavity of the membrane distillation reactor is connected with the water purifying tank through a fifth pipeline to form a circulating loop; and a third circulating pump and a third gate valve are arranged on a third pipeline between the membrane distillation reactor and the purified water tank.
A plurality of ultrasonic rods are uniformly arranged and immersed in the mariculture wastewater in the ultrasonic liquid storage tank, the working parameter coverage frequency of the ultrasonic rods is 20kHz-28kHz, and the power density is 0.6W/cm2 -0.8W/cm2。
The membrane component adopts a PTFE membrane, and the pore diameter of the membrane is 0.1-0.4 μm.
The anaerobic tank, the aerobic tank, the suspended filler balls and the aeration head form a suspended filler bed system; the aeration head is utilized to aerate the mariculture wastewater, and the aeration intensity is 2.5m3/ m2·h-3.5m3/ m2H, mode of action is continuous.
The water purification tank is at least buried at a depth of 30cm underground, and the water temperature in the water purification tank is 0-30 ℃.
The solar panel, the power converter and the power supply pipeline form a solar power supply system.
The membrane distillation reactor is a direct contact type membrane distillation reactor.
The aeration head is externally connected with a water source through a PVC pipe, and the aeration head and the PVC pipe form an aeration system.
The upper part of the aerobic tank is provided with an overflow pipe communicated with the aerobic tank, and the overflow pipe extends into the heating tank.
A method for treating mariculture wastewater by using a combined process device for treating mariculture wastewater by using an ultrasonic stripping-suspended packed bed-membrane distillation reactor is characterized by comprising the following steps of:
step 1), controlling an ultrasonic rod to carry out ultrasonic treatment on the mariculture wastewater in an ultrasonic liquid storage tank by an ultrasonic system control computer;
step 2), starting a first circulating pump for the mariculture wastewater subjected to the ultrasound in the ultrasound liquid storage tank, opening a first gate valve, and pumping the seawater into the anaerobic tank and the aerobic tank through the first circulating pump for nitrification and denitrification reaction;
step 3), overflowing the reacted mariculture wastewater to a sedimentation tank through a through part between the upper part of the aerobic tank and the upper part of the sedimentation tank for sedimentation, and overflowing the precipitated wastewater to a heating tank;
starting the heating rod, preheating by the heating rod, starting the second circulating pump, opening the second gate valve, pumping into the left chamber of the membrane distillation reactor through the second circulating pump and the second gate valve, and circulating into the heating pool through a water outlet of the left chamber of the membrane distillation reactor;
step 4), starting a second circulating pump, opening a third gate valve, pumping cooling water in the water purifying tank into a right cavity of the membrane distillation reactor through the third gate valve and the third circulating pump, and circulating the cooling water into the water purifying tank through a water outlet of the right cavity of the membrane distillation reactor;
the mariculture wastewater and the purified water are repeatedly circulated, the amount of the mariculture wastewater is gradually reduced and concentrated, and the water in the water purifying tank is continuously increased, so that the mariculture wastewater is treated.
The invention has reasonable structure and advanced and scientific method, and structurally comprises an ultrasonic liquid storage tank, an anaerobic tank, an aerobic tank, a sedimentation tank, a heating tank, a membrane distillation reactor and a water purification tank; the ultrasonic system controls a computer to control the ultrasonic bar, the ultrasonic bar is uniformly immersed in the ultrasonic liquid storage tank, and an ultrasonic generator is arranged on the side wall of the ultrasonic bar; the suspension filler balls are arranged in the anaerobic tank and the aerobic tank; the aeration head is arranged at the bottom of the aerobic tank; the solar panel supplies power to a heating rod arranged in the sedimentation tank through a power converter;
after being pretreated by the ultrasonic liquid storage tank, the mariculture wastewater flows to the suspended filler bed system through the first circulating pump; the heating pool, the second circulating pump, the second gate valve and the membrane distillation reactor pass through pipelinesThe water outlets of the left chamber of the membrane distillation reactor and the water inlet of the heating pool form a circulation loop; along cooling water flow direction, water purification case, third gate valve, third circulating pump, membrane distillation reactor pass through the pipeline and link to each other, and membrane distillation reactor chamber right side delivery port links to each other with the water purification case, forms circulation circuit. The ultrasonic rod is evenly immersed in the mariculture wastewater, the working parameter coverage frequency of the ultrasonic rod is between 20kHz and 28kHz, and the power density is 0.6W/cm2 -0.8W/cm2In the meantime. The membrane component adopts a PTFE membrane, and the pore diameter of the membrane is 0.1-0.4 μm. Aeration intensity is 2.5m3/ m2·h-3.5m3/ m2H, the mode of action is continuous. The water purifying tank is buried below 30cm underground, and the water temperature of the water purifying tank is between 0 ℃ and 30 ℃. The solar power supply system is composed of a solar panel, a power converter and a power supply pipeline. The membrane distillation reactor adopts a direct contact type membrane distillation reactor. The aeration system consists of PVC pipes and an aeration head.
Mariculture waste water after the supersound of ultrasonic liquid storage tank is carried out nitrification and denitrification reaction in suction anaerobism pond and the good oxygen pond through first circulating pump, and the mariculture waste water after the reaction overflows to the sedimentation tank through good oxygen pond upper end breach and deposits, and waste water after the sediment overflows to the heating pond, preheats the back through the heating rod, squeezes into membrane distillation reactor's left side cavity through the second circulating pump, and rethread membrane distillation reactor left side cavity delivery port circulates to the heating pond in. And cooling water in the water purifying tank is pumped into a right cavity of the membrane distillation reactor through a third circulating pump and then is circulated into the water purifying tank through a water outlet of the right cavity of the membrane distillation reactor. The mariculture wastewater and the purified water are repeatedly circulated, the amount of the mariculture wastewater is gradually reduced and concentrated, and the water in the water purifying tank is continuously increased. The preheating temperature of the mariculture wastewater is 40-80 ℃, and the water temperature of the water purifying tank is 0-30 ℃.
The device comprises an ultrasonic liquid storage tank, an anaerobic tank, an aerobic tank, a sedimentation tank, a heating tank, a membrane distillation reactor and a water purification tank; the ultrasonic system controls the computer to control the ultrasonic bars, the ultrasonic bars are uniformly distributed in the ultrasonic liquid storage tank, and the side wall of the ultrasonic bar is provided with an ultrasonic generator; the suspension filler balls are arranged in the anaerobic tank and the aerobic tank; the aeration head is arranged at the bottom of the aerobic tank; the solar panel supplies power to a heating rod arranged in the sedimentation tank through a power converter; after being pretreated by an ultrasonic liquid storage tank, the mariculture wastewater flows to a suspended filler bed system through a circulating pump; the heating pool, the circulating pump, the gate valve and the water inlet of the left chamber of the membrane distillation reactor are sequentially communicated through a pipeline, and the water outlet of the left chamber and the water inlet of the heating pool form a circulating loop; along the cooling water flow direction, the water purifying tank, the gate valve, the circulating pump and the water inlet of the right cavity of the membrane distillation reactor are connected through a pipeline, and the water outlet of the right cavity is connected with the water purifying tank to form a circulating loop. The front end of the membrane distillation reactor is additionally provided with an ultrasonic and suspension packed bed system, so that the permeation flux is improved, the pollution of the membrane surface is delayed, the service life of the membrane is prolonged, the treatment effect of the ammonia nitrogen and other volatile pollutants is greatly improved, the whole device can fully meet the treatment requirement of mariculture wastewater, and purified water with higher quality is obtained.
Compared with the prior art, the invention has the following characteristics:
1. the invention has better removal effect on organic matters, ammonia nitrogen and phosphate.
2. The combined process device of ultrasonic stripping-suspension packed bed-membrane distillation reactor is adopted to carry out ultrasonic treatment on organic matters in the mariculture wastewater, and the suspension packed bed is utilized to carry out pretreatment on ammonia nitrogen with poor removal effect, so that the organic matter deposition on the membrane surface is greatly reduced, the service life of the membrane is prolonged, and the effluent quality is improved.
3. The membrane distillation reactor converts high-salinity seawater into fresh water while purifying the mariculture wastewater, so that the problem of fresh water shortage in partial areas of China can be relieved.
4. Solar energy is adopted as a main energy source, so that energy can be saved, and the concept of green sustainable development is compounded. The operation is simple, the maintenance is easy, the method can be popularized and used in coastal culture areas, and the social economy is good.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: the system comprises an ultrasonic liquid storage tank A, an anaerobic tank B, an aerobic tank C, a sedimentation tank D, a heating tank E, a membrane distillation reactor F, a purified water tank G, an ultrasonic system control computer 1, an ultrasonic rod 2, a first circulating pump 3, a first gate valve 4, a plastic suspension filler ball 5, an aeration head 6, a power supply converter 7, a heating rod 8, a second circulating pump 9, a second gate valve 10, a membrane component 11, a third circulating pump 12, a third gate valve 13 and a solar panel 14.
Detailed Description
The invention is further described with reference to the accompanying drawings and the description thereof.
A combined process device for treating mariculture wastewater by using an ultrasonic stripping-suspended packed bed-membrane distillation reactor comprises an ultrasonic liquid storage tank A, an anaerobic tank B, an aerobic tank C, a sedimentation tank D, a heating tank E, a membrane distillation reactor F, a water purification tank G, an ultrasonic system control computer 1 and a solar panel 14, wherein the membrane distillation reactor F is provided with a left cavity and a right cavity, and a membrane assembly 11 is arranged between the left cavity and the right cavity and is separated by the membrane assembly 11.
A plurality of ultrasonic bars 2 are uniformly distributed in the ultrasonic liquid storage tank A, an ultrasonic system control computer 1 is connected with the ultrasonic bars 2 in the ultrasonic liquid storage tank A and used for controlling the ultrasonic bars 2, and ultrasonic generators are arranged on the side walls of the ultrasonic bars 2; suspension filler balls 5 are arranged in the anaerobic tank B and the aerobic tank C, and an aerator 6 is arranged at the bottom of the aerobic tank C; set up heating rod 8 in the sedimentation tank D, solar panel 14 is through being connected with heating rod 8 through the power supply pipeline, and installs power converter 7 on the power supply pipeline between solar panel 14, the heating rod 8 for arrange the inside heating rod 8 power supply of sedimentation tank D in.
The ultrasonic liquid storage tank A is communicated with the anaerobic tank B through a first pipeline, a first circulating pump 3 and a first gate valve 4 are installed on the first pipeline between the ultrasonic liquid storage tank A and the anaerobic tank B, and the first circulating pump 3 is located between the ultrasonic liquid storage tank A and the first gate valve 4; the anaerobic tank B is communicated with the aerobic tank C, and the communicated part is positioned at the lower parts of the anaerobic tank B and the aerobic tank C.
The aerobic tank C, the sedimentation tank D and the heating tank E are sequentially communicated, the communicated part of the aerobic tank C and the sedimentation tank D is positioned at the upper parts of the aerobic tank C and the sedimentation tank D, the communicated part of the sedimentation tank D and the heating tank E is positioned at the upper parts of the sedimentation tank D and the heating tank E, the heating tank E is communicated with a water inlet of a cavity at the left side of the membrane distillation reactor F through a second pipeline, a second circulating pump 9 and a second gate valve 10 are installed on the second pipeline between the heating tank E and the membrane distillation reactor F, and the second circulating pump 9 is positioned between the heating tank E and the second gate valve 10; and a water outlet of the left chamber of the membrane distillation reactor F is communicated with a water inlet of the heating pool E through a fourth pipeline to form a circulation loop.
The water purifying tank G is connected with a water inlet of a right chamber of the membrane distillation reactor F through a third pipeline, and a water outlet of the right chamber of the membrane distillation reactor F is connected with the water purifying tank G through a fifth pipeline to form a circulation loop; and a third circulating pump 12 and a third gate valve 13 are arranged on a third pipeline between the membrane distillation reactor F and the purified water tank G.
Further, a plurality of ultrasonic rods 2 are uniformly arranged and immersed in the mariculture wastewater in the ultrasonic liquid storage tank A, the working parameter coverage frequency of the ultrasonic rods 2 is 20kHz-28kHz, and the power density is 0.6W/cm2 -0.8W/cm2. The membrane component 11 adopts a PTFE membrane, and the pore diameter of the membrane is 0.1-0.4 μm. The anaerobic tank B, the aerobic tank C, the suspension filler balls 5 and the aeration head 6 form a suspension filler bed system; the aeration head 6 is utilized to aerate the mariculture wastewater, and the aeration intensity is 2.5m3/ m2·h-3.5m3/ m2H, mode of action is continuous. The water purifying tank G is at least buried at a depth of 30cm underground, and the water temperature in the water purifying tank G is 0-30 ℃. The solar panel 14, the power converter 7 and the power supply pipeline form a solar power supply system. The membrane distillation reactor F is a direct contact membrane distillation reactor. The aeration head 6 is externally connected with a water source through a PVC pipe, and the aeration head 6 and the PVC pipe form an aeration system. And the upper part of the aerobic tank C is provided with an overflow pipe communicated with the aerobic tank C, and the overflow pipe extends into the heating tank E.
A method for treating mariculture wastewater by using a combined process device for treating mariculture wastewater by using an ultrasonic stripping-suspended packed bed-membrane distillation reactor comprises the following steps:
step 1), an ultrasonic system control computer 1 controls an ultrasonic rod 2 to carry out ultrasonic treatment on the mariculture wastewater in an ultrasonic liquid storage tank A;
step 2), starting a first circulating pump 3 for the mariculture wastewater subjected to ultrasound in the ultrasound liquid storage tank A, opening a first gate valve 4, and pumping the seawater into the anaerobic tank B and the aerobic tank C through the first circulating pump 3 to perform nitrification and denitrification reaction;
step 3), overflowing the reacted mariculture wastewater to a sedimentation tank D through a through part between the upper part of the aerobic tank C and the upper part of the sedimentation tank D for sedimentation, and overflowing the precipitated wastewater to a heating tank E; starting the heating rod 8, preheating by the heating rod 8, starting the second circulating pump 9, opening the second gate valve 10, pumping into the left chamber of the membrane distillation reactor F through the second circulating pump 9 and the second gate valve 10, and circulating into the heating pool E through a water outlet of the left chamber of the membrane distillation reactor F;
step 4), starting a second circulating pump 9, opening a third gate valve 13, pumping cooling water in a purified water tank G into a right cavity of the membrane distillation reactor F through the third gate valve 13 and a third circulating pump 12, and circulating the cooling water into the purified water tank G through a water outlet of the right cavity of the membrane distillation reactor F;
the mariculture wastewater and the purified water are repeatedly circulated, the amount of the mariculture wastewater is gradually reduced and concentrated, and the water in the water purifying tank is continuously increased, so that the mariculture wastewater is treated.
In the invention, the ultrasonic rods 2 in the ultrasonic liquid storage tank A are uniformly arranged in the liquid storage tank in an insertion working mode, and the ultrasonic rods with proper power are selected according to the size of the ultrasonic liquid storage tank A, so that the coverage frequency of the ultrasonic rods is between 20kHz and 28 kHz. The ultrasonic time of the computer is controlled by an ultrasonic system to be between 3h and 5h, and the power density is 0.6W/cm2 -0.8W/cm2In the meantime. The suspension packed bed system consists of an anaerobic tank B and an aerobic tank C, wherein an aeration head 6 is arranged at the bottom of the aerobic tank C, and the mariculture wastewater is subjected to circular denitrification treatment in the system after suspension packed ball biofilm formation is finished by adopting a continuous aeration mode.
The formula overflow structure that sedimentation tank D chose for use, the mariculture waste water after settling through the gravity overflow to heating pond E in through the overflow mouth in top. The heating rod 8 adopts an automatic constant temperature heater, and when the temperature reaches a set temperature range, the heating is stopped. The first circulating pump 3, the second circulating pump 9 and the third circulating pump 12 all adopt water pumps with controllable flow.
The membrane distillation reactor adopts one or more of hollow fiber, plate type or tubular type, and the membrane module 11 adopts PTFE membrane.
When in use, the power density of the mariculture wastewater is 0.6W/cm2 -0.8W/cm2After the ultrasonic liquid storage tank is subjected to ultrasonic treatment for 3 to 5 hours, the mariculture wastewater subjected to ultrasonic treatment is pumped into an anaerobic tank B through a circulating pump, and the aeration intensity is 2.5m3/ m2·h-3.5m3/ m2H, carrying out a nitrification and denitrification reaction on the aerobic tank C; overflowing the reacted mariculture wastewater into a sedimentation tank D through a hollow pipe at the upper end of an aerobic tank C for sedimentation for 2-4 h, and overflowing the settled upper-layer wastewater into a heating tank E; the heating rod 8 preheats the mariculture wastewater to 40-80 ℃.
After preheating, the wastewater is pumped into the left cavity of the membrane distillation reactor F through the second circulating pump 9, and then is circulated into the heating pool E through the water outlet of the left cavity of the membrane distillation reactor F.
The clean water in the clean water tank G is pumped into the right chamber of the membrane distillation reactor F through the third circulating pump 12 and then is circulated into the clean water tank G through the water outlet of the right chamber of the membrane distillation reactor F, and the temperature of the clean water tank is between 0 ℃ and 30 ℃.
Because the left side chamber of the membrane distillation reactor F is filled with mariculture wastewater with higher temperature, the right side chamber is filled with purified water with lower temperature, steam pressure difference exists between the two sides, water in the mariculture wastewater on the left side enters the right side chamber through the PTFE membrane in a steam mode, and the water is condensed into liquid on the right side purified water side due to temperature reduction; in order to improve the membrane flux, delay the deposition of pollutants on the membrane surface, prolong the service life of the membrane and improve the effluent quality, a pretreatment mode is adopted. Organic matters in the mariculture wastewater are destroyed by ultrasound, and the destroyed flocculent organic matters are precipitated in a sedimentation tank; and (3) carrying out denitrification treatment on the mariculture wastewater by using a suspended filler bed system.
Wherein the ultrasonic frequency is 20kHz-28kHz, and the power density is 0.6W/cm2 -0.8W/cm2To (c) to (d);
the aeration intensity is between 2.5m 3/m 2 & h and 3.5m 3/m 2 & h. Both modes of action are continuous.
The mariculture wastewater and the purified water are repeatedly circulated, the amount of the mariculture wastewater is gradually reduced and concentrated, and the purified water in the purified water tank is continuously increased.
Example 1
The power density of the mariculture wastewater is 0.7W/cm2After the ultrasonic liquid storage tank is subjected to ultrasonic treatment for 3 hours, the mariculture wastewater subjected to ultrasonic treatment is pumped into an anaerobic tank B through a circulating pump, and the aeration intensity is 2.7m3/ m2H, carrying out a nitrification and denitrification reaction on the aerobic tank C; overflowing the reacted mariculture wastewater into a sedimentation tank D through a hollow pipe at the upper end of an aerobic tank C for sedimentation for 2 hours, and overflowing the settled upper-layer wastewater into a heating tank E; the heating rod 8 preheats the mariculture wastewater to 50 ℃; after preheating, the wastewater is pumped into the left cavity of the membrane distillation reactor F through the second circulating pump 9, and then is circulated into the heating pool E through the water outlet of the left cavity of the membrane distillation reactor F. The clean water in the clean water tank G is pumped into the right chamber of the membrane distillation reactor F through a third circulating pump 12 and then is circulated into the clean water tank G through the water outlet of the right chamber of the membrane distillation reactor F, and the temperature of the clean water tank is 15-20 ℃. Because the left side chamber of the membrane distillation reactor F is filled with mariculture wastewater with higher temperature, the right side chamber is filled with purified water with lower temperature, steam pressure difference exists between the two sides, water in the mariculture wastewater on the left side enters the right side chamber through the PTFE membrane in a steam mode, and the water is condensed into liquid on the right side purified water side due to temperature reduction; in order to improve the membrane flux, delay the deposition of pollutants on the membrane surface, prolong the service life of the membrane and improve the effluent quality, a pretreatment mode is adopted. Organic matters in the mariculture wastewater are destroyed by ultrasound, and the destroyed flocculent organic matters are precipitated in a sedimentation tank; and (3) carrying out denitrification treatment on the mariculture wastewater by using a suspended filler bed system. The mariculture wastewater and the purified water are repeatedly circulated, the amount of the mariculture wastewater is gradually reduced and concentrated, and the purified water in the purified water tank is the treated water.
Example 2
The power density of the mariculture wastewater is 0.8W/cm2After the ultrasonic liquid storage tank is subjected to ultrasonic treatment for 4 hours, the ultrasonic mariculture wastewater is pumped into an anaerobic tank B through a first circulating pump, and the aeration intensity is 3.5m3/ m2H, carrying out a nitrification and denitrification reaction on the aerobic tank C; reacted mariculture wastewater channelOverflowing the wastewater to a sedimentation tank D through a hollow pipe at the upper end of the aerobic tank C for sedimentation for 3 hours, and overflowing the settled upper-layer wastewater to a heating tank E; the heating rod 8 preheats the mariculture wastewater to 60 ℃; after preheating, the wastewater is pumped into the left cavity of the membrane distillation reactor F through the second circulating pump 9, and then is circulated into the heating pool E through the water outlet of the left cavity of the membrane distillation reactor F. The clean water in the clean water tank G is pumped into the right chamber of the membrane distillation reactor F through a third circulating pump 12 and then is circulated into the clean water tank G through the water outlet of the right chamber of the membrane distillation reactor F, and the temperature of the clean water tank G is 10-15 ℃. Because the left side chamber of the membrane distillation reactor F is filled with mariculture wastewater with higher temperature, the right side chamber is filled with purified water with lower temperature, steam pressure difference exists between the two sides, water in the mariculture wastewater on the left side enters the right side chamber through the PTFE membrane in a steam mode, and the water is condensed into liquid on the right side purified water side due to temperature reduction; in order to improve the membrane flux, delay the deposition of pollutants on the membrane surface, prolong the service life of the membrane and improve the effluent quality, a pretreatment mode is adopted. Organic matters in the mariculture wastewater are destroyed by ultrasound, and the destroyed flocculent organic matters are precipitated in a sedimentation tank; and (3) carrying out denitrification treatment on the mariculture wastewater by using a suspended filler bed system. The mariculture wastewater and the purified water are repeatedly circulated, the amount of the mariculture wastewater is gradually reduced and concentrated, and the purified water in the purified water tank is the treated water.

Claims (10)

1. A combined process device for treating mariculture wastewater by using an ultrasonic stripping-suspended packed bed-membrane distillation reactor is characterized by comprising an ultrasonic liquid storage tank (A), an anaerobic tank (B), an aerobic tank (C), a sedimentation tank (D), a heating tank (E), a membrane distillation reactor (F), a water purification tank (G), an ultrasonic system control computer (1) and a solar panel (14), wherein the membrane distillation reactor (F) is provided with a left cavity and a right cavity, and a membrane assembly (11) is arranged between the left cavity and the right cavity and is separated by the membrane assembly (11);
a plurality of ultrasonic bars (2) are uniformly distributed in the ultrasonic liquid storage tank (A), the ultrasonic system control computer (1) is connected with the ultrasonic bars (2) in the ultrasonic liquid storage tank (A) and used for controlling the ultrasonic bars (2), and ultrasonic generators are arranged on the side walls of the ultrasonic bars (2); suspension filler balls (5) are arranged in the anaerobic tank (B) and the aerobic tank (C), and an aeration head (6) is arranged at the bottom of the aerobic tank (C); a heating rod (8) is arranged in the sedimentation tank (D), the solar panel (14) is connected with the heating rod (8) through a power supply pipeline, and a power supply converter (7) is arranged on the power supply pipeline between the solar panel (14) and the heating rod (8) and used for supplying power to the heating rod (8) arranged in the sedimentation tank (D);
the ultrasonic liquid storage tank (A) is communicated with the anaerobic tank (B) through a first pipeline, a first circulating pump (3) and a first gate valve (4) are installed on the first pipeline between the ultrasonic liquid storage tank (A) and the anaerobic tank (B), and the first circulating pump (3) is located between the ultrasonic liquid storage tank (A) and the first gate valve (4); the anaerobic tank (B) is communicated with the aerobic tank (C), and the communicated part is positioned at the lower parts of the anaerobic tank (B) and the aerobic tank (C);
the aerobic tank (C), the sedimentation tank (D) and the heating tank (E) are sequentially connected in a through manner, the through position of the aerobic tank (C) and the sedimentation tank (D) is positioned at the upper parts of the aerobic tank (C) and the sedimentation tank (D), the through position of the sedimentation tank (D) and the heating tank (E) is positioned at the upper parts of the sedimentation tank (D) and the heating tank (E), the heating tank (E) is communicated with a water inlet of a left cavity of the membrane distillation reactor (F) through a second pipeline, a second circulating pump (9) and a second gate valve (10) are installed on a second pipeline between the heating tank (E) and the membrane distillation reactor (F), and the second circulating pump (9) is positioned between the heating tank (E) and the second gate valve (10); a water outlet of a chamber on the left side of the membrane distillation reactor (F) is communicated with a water inlet of the heating pool (E) through a fourth pipeline to form a circulation loop;
the water purifying tank (G) is connected with a water inlet of a right cavity of the membrane distillation reactor (F) through a third pipeline, and a water outlet of the right cavity of the membrane distillation reactor (F) is connected with the water purifying tank (G) through a fifth pipeline to form a circulation loop; a third circulating pump (12) and a third gate valve (13) are arranged on a third pipeline between the membrane distillation reactor (F) and the purified water tank (G).
2. The combined process unit for treating the mariculture wastewater by the ultrasonic stripping-suspension packed bed-membrane distillation reactor as claimed in claim 1, wherein a plurality of ultrasonic bars (2) are uniformly arranged and immersed in the mariculture wastewater in the ultrasonic liquid storage tank (A), the covering frequency of the working parameters of the ultrasonic bars (2) is 20kHz-28kHz, and the power density is 0.6W/cm2 -0.8W/cm2。
3. The combined process unit for treating the mariculture wastewater by the ultrasonic stripping-suspension packed bed-membrane distillation reactor as claimed in claim 1, wherein the membrane module (11) adopts a PTFE membrane, and the pore diameter of the membrane is 0.1-0.4 μm.
4. The combined process device for treating the mariculture wastewater by the ultrasonic stripping-suspension packed bed-membrane distillation reactor as claimed in claim 1, wherein an anaerobic tank (B), an aerobic tank (C), suspension packed balls (5) and an aeration head (6) form a suspension packed bed system; the aeration head (6) is utilized to aerate the mariculture wastewater, and the aeration intensity is 2.5m3/ m2·h-3.5m3/ m2H, mode of action is continuous.
5. The combined process unit for treating the mariculture wastewater by the ultrasonic air stripping-suspension packed bed-membrane distillation reactor as claimed in claim 1, wherein the water purification tank (G) is buried at least at a depth of 30cm underground, and the water temperature in the water purification tank (G) is 0-30 ℃.
6. The combined process device for treating the mariculture wastewater by the ultrasonic stripping-suspension packed bed-membrane distillation reactor as claimed in claim 1, wherein a solar panel (14), a power supply converter (7) and a power supply pipeline form a solar power supply system.
7. The combined process unit for treating mariculture wastewater of an ultrasonic stripping-suspension packed bed-membrane distillation reactor as claimed in claim 1, wherein the membrane distillation reactor (F) is a direct contact membrane distillation reactor.
8. The combined process device for treating the mariculture wastewater by the ultrasonic air stripping-suspension packed bed-membrane distillation reactor as claimed in claim 1, wherein the aeration head (6) is externally connected with a water source through a PVC pipe, and the aeration head (6) and the PVC pipe form an aeration system.
9. The combined process unit for treating mariculture wastewater by the ultrasonic stripping-suspension packed bed-membrane distillation reactor as claimed in claim 1, wherein an overflow pipe communicated with the aerobic tank (C) is arranged at the upper part of the aerobic tank (C), and the overflow pipe extends into the heating tank (E).
10. The method for treating the mariculture wastewater by using the combined process device for treating the mariculture wastewater by using the ultrasonic air stripping-suspension packed bed-membrane distillation reactor as claimed in any one of claims 1 to 9, is characterized by comprising the following steps of:
step 1), controlling an ultrasonic rod (2) to carry out ultrasonic treatment on the mariculture wastewater in an ultrasonic liquid storage tank (A) by an ultrasonic system control computer (1);
step 2), starting a first circulating pump (3) for the mariculture wastewater subjected to ultrasound in the ultrasound liquid storage tank (A), opening a first gate valve (4), and pumping the seawater into the anaerobic tank (B) and the aerobic tank (C) through the first circulating pump (3) to perform nitrification and denitrification reaction;
step 3), overflowing the reacted mariculture wastewater to the sedimentation tank (D) through a through part between the upper part of the aerobic tank (C) and the upper part of the sedimentation tank (D) for sedimentation, and overflowing the precipitated wastewater to the heating tank (E);
starting the heating rod (8), preheating by the heating rod (8), starting the second circulating pump (9), opening the second gate valve (10), pumping into the left chamber of the membrane distillation reactor (F) through the second circulating pump (9) and the second gate valve (10), and circulating into the heating pool (E) through a water outlet of the left chamber of the membrane distillation reactor (F);
step 4), starting a second circulating pump (9), opening a third gate valve (13), pumping cooling water in a purified water tank (G) into a right cavity of the membrane distillation reactor (F) through the third gate valve (13) and a third circulating pump (12), and circulating the cooling water into the purified water tank (G) through a water outlet of the right cavity of the membrane distillation reactor (F);
the mariculture wastewater and the purified water are repeatedly circulated, the amount of the mariculture wastewater is gradually reduced and concentrated, and the water in the water purifying tank is continuously increased, so that the mariculture wastewater is treated.
CN202111258149.6A 2021-10-27 2021-10-27 Combined process device for treating mariculture wastewater by ultrasonic stripping-suspended packed bed-membrane distillation reactor and treatment method thereof Withdrawn CN113880362A (en)

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