CN115159666B - Black and odorous water body treatment device - Google Patents
Black and odorous water body treatment device Download PDFInfo
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- CN115159666B CN115159666B CN202210887028.6A CN202210887028A CN115159666B CN 115159666 B CN115159666 B CN 115159666B CN 202210887028 A CN202210887028 A CN 202210887028A CN 115159666 B CN115159666 B CN 115159666B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
- B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The application discloses a black and odorous water body treatment device. The high-pressure dissolved air tank comprises an air path, a water path and a high-pressure dissolved air tank (10), wherein a hollow fiber membrane component (8) or a vortex street pipe (22) is arranged in the high-pressure dissolved air tank (10), and a high-pressure electrode (3) is arranged on the air path pipeline; the upper part of the high-pressure dissolved air tank (10) is respectively connected with an air circuit pipeline and a water circuit pipeline; the lower part of the high-pressure dissolved air tank (10) is connected with an ultrasonic vibration device (14) through a pipeline, the ultrasonic vibration device (14) is connected with a dissolved oxygen water outlet pipeline, and the dissolved oxygen water outlet pipeline is connected with a diffusing pipe (15). The application adopts three modes of hollow fiber membrane, vortex street pipe and ultrasonic cavitation to prepare high-concentration dissolved oxygen water, and the high-concentration dissolved oxygen water is injected into the black and odorous water body to be treated through the cyclone diffusion pipe, so that the solubility of the oxygen in the water body is rapidly and uniformly improved, the microbial activity is improved, and the pollutant index is reduced.
Description
Technical Field
The application belongs to the technical field of sewage treatment, and particularly relates to a black and odorous water body treatment device.
Background
Along with the accumulation of pollutants, the ecology of the water body is gradually destroyed, the self-cleaning effect of the water body reaches the limit, the water quality is deteriorated, and the sense of the water body is blackened and smelly. The black and odorous water body not only brings uncomfortable sensory feeling to people, but also greatly influences the physical and mental health of people. Therefore, the black and odorous water body treatment technology with low investment, quick response and no secondary pollution is researched to accord with the current development trend.
At present, the black and odorous reasons of urban water bodies can be mainly summarized into the discharge of exogenous pollutants, the release of endogenous pollutants, insufficient hydrodynamic conditions and the destruction of biological diversity in the water bodies; the current technical means for treating black and odorous water bodies mainly comprise exogenous pollution interception, endogenous treatment and ecological restoration.
The aeration and oxygenation technology is an important technical measure for improving the water quality of the black and odorous water body, and is mainly applied to three conditions in the treatment of the black and odorous water body. The first is to carry out artificial oxygenation for solving the organic pollution of the water body before the external interception is completely solved; the second is that after the interception of exogenous pollution is completed, the water body is still in an anoxic state, and the self-cleaning capacity of the water body is recovered through artificial oxygenation; and thirdly, an emergency aeration device is arranged in the treated water body to cope with sudden pollution encountered by the water body, such as urban rain sewage mixed overflow into the water body caused by continuous heavy rainfall. The aeration and oxygenation technology is considered to achieve the purposes of eliminating black and odorous substances, reducing water pollution and promoting ecological restoration.
The aeration oxygenation is a technology which can effectively eliminate black and odorous water, reduce water pollution, is clean and free of secondary pollution and has little investment and wide prospect in black and odorous water treatment.
The traditional blast aeration and water surface mechanical aeration are low in efficiency and high in energy consumption, the diameters of generated bubbles are in millimeter or even centimeter level, water surface disturbance and malodorous gas volatilization are caused, and the bubbles can quickly rise to the water surface to break and disappear after being generated in water.
Micro-nano bubble technology has become one of the research hotspots in recent years; the micro-nano bubbles have the characteristics of small diameter, long residence time in water, strong oxidability and the like.
Oxygen can be injected into the polluted water body more effectively through the micro-nano bubbles, and even can be diffused and sunk into the bottom mud, so that the growth of anaerobic bacteria is effectively inhibited, and the high-efficiency treatment of malodorous water body is realized.
Wang Meili and the like treat black and odorous water bodies by utilizing a micro-nano aeration device, and compare the treatment effects of different aeration amounts, the removal efficiency is highest under the air amount of 0.3L/min, and the removal rates of COD, ammonia nitrogen and TP respectively reach 51.4%, 55.8% and 31.0% when the treatment is carried out for 90 min.
Jipeng and the like research on the effect of the carbon fiber wetland type artificial floating bed on purifying water quality under micro-nano aeration and microporous aeration, and find that the removal rates of COD, ammonia nitrogen and TP in the water body by the micro-nano carbon fiber floating bed respectively reach 72.6%, 71.9% and 65.4% under the same hydraulic retention time and air-water ratio conditions, are higher than those of the microporous aeration groups, and can finish the film forming process of the carbon fiber filler in a shorter time.
The preparation of high-concentration dissolved oxygen water by forming micro-nano bubbles has extremely high research prospect, but no example of directly treating black and odorous water body by the high-concentration dissolved oxygen water exists at present.
At present, micro-nano bubbles are manufactured mainly by a dissolved air release and hydrodynamic cavitation method and an ultrasonic cavitation method.
The gas dissolving and releasing method is to dissolve gas in water to form supersaturation state and release gas via decompression to produce great amount of micro bubbles. The size and strength of the bubbles depend on various conditions in releasing the air and the surface tension of the water.
Hydrodynamic cavitation is to make oxygen continuously sheared by water flow to form micro bubbles after entering the vortex by manufacturing the vortex in a turbulent state; the hydrodynamic cavitation method has the characteristics of low energy consumption, no secondary pollution and the like; however, the method has high equipment requirement and high processing difficulty.
The ultrasonic cavitation method mainly uses the fact that when liquid receives the negative pressure action of sound waves, the distance between molecules of a medium exceeds the critical molecular distance which enables the liquid medium to keep unchanged, and the liquid medium breaks to form cavitation bubbles. Cavitation can be classified into steady-state cavitation and transient cavitation. Steady-state cavitation mostly occurs at lower sound pressures, and cavitation bubbles can be kept in a relatively stable state and kept from collapsing for several periods. Transient cavitation generally occurs under the action of high sound pressure to generate high temperature and high pressure, so that water molecules are decomposed to generate hydroxyl radicals. At present, the ultrasonic cavitation method alone cannot continuously generate micro bubbles, and has the defects of high energy consumption, easy heating during continuous operation, low efficiency and the like.
Disclosure of Invention
The application provides a black and odorous water body treatment device aiming at the defects in the prior art.
The technical scheme of the application is as follows: a group of hollow fiber membranes are arranged in a high-pressure dissolved air tank, and oxygen is injected into a water body in a diffusion mode through the hollow fiber membranes under the high-pressure condition by utilizing the air permeability and water impermeability characteristics of the hollow fiber membranes, so that high-concentration dissolved oxygen water with higher dissolved oxygen concentration is prepared.
The technical scheme of the application is designed based on the following principle that the essence of high-concentration dissolved oxygen water aeration is a gas mass transfer process, and oxygen in micro-nano bubbles needs to pass through a two-phase interface and transfer mass through diffusion.
Principle of diffusion of gas-liquid in hollow fiber membranes: the rate of oxygen transfer into a unit body of water through the hollow fibers is expressed mathematically as follows:
M＝KA(C e -C o )
wherein: m is oxygen mass transfer rate, mol/(L.h);
k is the total mass transfer coefficient, m/h;
a is the surface area of the fiber membrane, m 2 ；
(C e -C o ) Is the concentration difference of oxygen in gas phase and liquid phase, and mol/L.
To increase the mass transfer rate of oxygen in a body of water requires an increase in the total mass transfer coefficient K and the concentration difference of oxygen in the gas and liquid phases.
For increasing the concentration difference of oxygen in the gas phase and the liquid phase, this can be achieved by appropriately increasing the intake pressure. Because the proper increase of the pressure of the inlet air is equivalent to the increase of C s However, when the pressure is too high for the hollow fiber membrane, bubbles are generated on the surface of the membrane beyond the bubble point, and the mass transfer efficiency is lowered.
For hollow fiber membranes, the total mass transfer coefficient K can be expressed mathematically as follows:
wherein: k (K) L Is the coefficient of liquid film, mol/(m) 2 ·s)；
K m For the film transfer coefficient, mol/(m) 2 ·s)；
K g Is the gas film coefficient, mol/(m2.s);
h is a henry's law constant.
Liquid film coefficient K L Diffusion coefficient D with oxygen in water w The relationship with the thickness delta of the concentration boundary layer is as follows:
from the above formula, HK for oxygen g <<1/K L Negligible.
As shown in figure 2 of the drawings, at the die holes of the hollow fiber membrane, the membrane transfer coefficient K m Since there is no blocking of the film, the influence of the film can be ignored, K m Can be regarded as infinity, but at non-membrane pores, K m Can be regarded as approximately zero, while K m The size of (a) decreases with increasing ratio of pore surface area to total surface area of the fibrous membrane.
The gas molecules are generally neutral, and under the action of a high-voltage electric field, a part of the gas molecules can collide and combine with free electrons under the action of the electric field, so that negative ions are formed by charging, and the process is called a charging process.
Various free electrons are formed through corona discharge, and the electrons move under the action of a high-voltage electric field and collide with molecules, so that the free electrons in the gas are increased, and charge is realized.
According to theoretical calculation, as the electric field intensity increases, the saturated charge amount also increases.
Cavitation is the process in which when the local pressure in a liquid is reduced, a cavity (cavitation) is formed by gas in the liquid or at the solid-liquid interface, and the cavitation grows and finally collapses. Cavitation can be generally classified into hydrodynamic cavitation and hydrodynamic cavitation.
Acoustic cavitation is the transmission of ultrasonic waves in water to cause vibration, and is the generation of local tensile stress in liquid, so that negative pressure is formed, and gas dissolved in water becomes supersaturated, so that bubbles are formed.
According to the related principles, two methods are mainly involved for preparing high-concentration dissolved oxygen water: (1) high pressure air intake improves oxygen transfer efficiency; (2) the oxygen molecules are polarized by utilizing an ultrahigh-voltage electric field, so that the oxygen is easier to combine with water molecules; (3) the size of the oxygen molecular group is reduced by utilizing the micro aperture of the hollow fiber membrane.
A black and odorous water body treatment device comprises an air channel, a waterway and a high-pressure dissolved air tank, wherein a hollow fiber membrane component or a vortex street pipe is arranged in the high-pressure dissolved air tank, and a high-pressure electrode is arranged on an air channel pipeline; the upper part of the high-pressure dissolved air tank is respectively connected with an air circuit pipeline and a water circuit pipeline; the lower part of the high-pressure dissolved air tank is connected with an ultrasonic vibration device through a pipeline, the ultrasonic vibration device is connected with an oxygen dissolving water outlet pipeline, and the oxygen dissolving water outlet pipeline is connected with a bleeding pipe.
According to the embodiment of the application, a water reservoir, a filter, a flowmeter and a plunger pump are arranged on the waterway pipeline, and a degassing membrane component is arranged on the pipeline at the rear part of the filter; and a high-voltage electrode is arranged on a pipeline at the rear part of the plunger pump.
According to the embodiment of the application, the lower part of the high-pressure dissolved air tank is also connected with an oxygen supplementing pipeline, and an oxygen supplementing valve is arranged on the oxygen supplementing pipeline.
According to the embodiment of the application, the diffusing pipe is a rotational flow diffusing pipe, and the rotational flow diffusing pipe consists of two dissolved oxygen water inlets and one outlet; the cyclone diffusing pipe is internally provided with a conical cavity.
According to the embodiment of the application, the vortex street pipe is formed by connecting two or more vortex street spray heads in series through pipelines, the vortex street spray heads comprise an inner pipe and an outer pipe, a spiral groove structure is arranged in the inner pipe, the outer pipe is formed by hollow small pipes which are uniformly and alternately distributed, a gasket is arranged at the upper part of the spiral groove, and a partition is arranged in the middle of the gasket.
According to the embodiment of the application, the stainless steel electrode is arranged inside the high-voltage electrode, the insulating layer is arranged outside the stainless steel electrode, and according to the embodiment of the application, the stainless steel electrode is fixed in the insulating layer by the insulating bracket and is connected with a high-voltage power supply.
The upper part of the high-pressure dissolved air tank is provided with a floating ball liquid level meter, and the lower part of the high-pressure dissolved air tank is provided with a pressure relief valve.
The application adopts three modes of hollow fiber membrane, vortex street pipe and ultrasonic cavitation to prepare high-concentration dissolved oxygen water, and the high-concentration dissolved oxygen water is injected into the black and odorous water body to be treated through the cyclone diffusion pipe, so that the solubility of the oxygen in the water body is rapidly and uniformly improved, the microbial activity is improved, and the pollutant index is reduced.
Drawings
FIG. 1 is a block diagram of a black and odorous water body treatment device using a hollow fiber membrane module.
FIG. 2 is a schematic illustration of oxygen diffusion into water in a hollow fiber membrane.
FIG. 3 is a schematic diagram of the gas-liquid exchange of the hollow fiber membrane.
FIG. 4 is a detailed view of the hollow fiber membrane pores.
Fig. 5 is a view showing the structure of the diffuser pipe.
Fig. 6 is a structure diagram of a high voltage electrode.
Fig. 7 is a view showing the structure of a vortex street pipe.
Fig. 8 is a front view of the vortex street tube.
Fig. 9 is a cross-sectional view A-A of fig. 8.
Fig. 10 is a B-sectional view of fig. 8.
Fig. 11 is a perspective view of a convolute groove.
FIG. 12 is a graph showing the change in dissolved oxygen concentration (25 ℃ C.) with the intake pressure.
In the figure: 1-an oxygen cylinder; 2-a pressure gauge; 3-high voltage electrode; 4-a filter; 5-a flow meter; 6-a plunger pump; 7-an oxygen make-up valve; 8-a hollow fiber membrane module; 9-a floating ball level gauge; 10-a high-pressure dissolved air tank; 11-a pressure relief valve; 12-reservoir; 13-degassing membrane module; 14-an ultrasonic vibration device; 15-a diffusing pipe; 16-dissolved oxygen water inlet; 17-dissolved oxygen water outlet; 18-an insulating layer; 19-stainless steel electrode; 20-high voltage power supply; 21-an insulating support; 22-vortex street tube; 23-an outer tube; 24-inner tube; 25-tubules; 26-a gasket; 27-spiral groove.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1: the black and odorous water body treatment device comprises a gas circuit, a water circuit and a high-pressure dissolved air tank 10, wherein a hollow fiber membrane component 8 is arranged in the high-pressure dissolved air tank 10; the gas circuit pipeline is provided with a high-voltage electrode 3; the upper part of the high-pressure dissolved air tank 10 is respectively connected with an air circuit pipeline and a water circuit pipeline; the lower part of the high-pressure dissolved air tank 10 is connected with an ultrasonic vibration device 14 through a pipeline, the ultrasonic vibration device 14 is connected with an oxygen dissolving water outlet pipeline, and the oxygen dissolving water outlet pipeline is connected with a diffusing pipe 15.
The water way pipeline is provided with a water reservoir 12, a filter 4, a flowmeter 5 and a plunger pump 6, and the pipeline at the rear part of the filter 4 is provided with a degassing membrane component 13; a high voltage electrode 3 is arranged on the pipeline at the rear part of the plunger pump 6.
The lower part of the high-pressure dissolved air tank 10 is also connected with an oxygen supplementing pipeline, and an oxygen supplementing valve 7 is arranged on the oxygen supplementing pipeline.
The diffusing pipe 15 is a rotational flow diffusing pipe, and the rotational flow diffusing pipe is composed of two dissolved oxygen water inlets 16 and one dissolved oxygen water outlet 17; the cyclone diffusing pipe is internally provided with a conical cavity.
The inside of the high-voltage electrode 3 is provided with a stainless steel electrode 19, the outside of the stainless steel electrode 19 is provided with an insulating layer 18, the stainless steel electrode 19 is fixed in the insulating layer 18 by an insulating bracket 21, and the stainless steel electrode 19 is connected with a high-voltage power supply (20).
The upper part of the high-pressure dissolved air tank 10 is provided with a floating ball liquid level meter 9, and the lower part is provided with a pressure relief valve 11.
The high-pressure dissolved air tank 10 used in the test has an outer diameter of 426mm, a straight section length of 1300mm and an effective volume of about 160L.
For measuring the mixed pressure and the intake pressure in the high-pressure dissolved air tank 10, a 1.5-level-precision pressure gauge 2 is installed on the high-pressure dissolved air tank 10 and the air path, respectively.
The principle of gas exchange with liquid in the high-pressure dissolved air tank 10 through the hollow fiber membrane module 8 is shown in fig. 3 and 4.
The test needs to explore the influence of different water inlet properties on the preparation of high-concentration dissolved oxygen water, so that three water inlet types of common tap water, RO membrane water outlet and degassing membrane water outlet are adopted.
During the test, common tap water and RO membrane effluent are firstly stored in a 500×300×500mm water reservoir 12 to ensure stable operation of the plunger pump 6.
The test equipment adopts an automatic control system, and all control switches of the equipment can be opened and closed through an operation panel.
The black and odorous water body treatment device is characterized in that gas and water flow respectively enter a high-pressure dissolved air tank 10 through a gas path and a water path, and the preparation of high-concentration dissolved oxygen water is realized in a hollow fiber membrane component 8; meanwhile, the device is provided with the high-voltage electrode 3 of the ultra-high voltage electric field on the gas circuit and the water circuit, and the intensity of the electric field can be changed by adjusting the voltage of the high-voltage power supply 20; the device is provided with two water inlet pipelines, and different water inlet conditions can be changed by adjusting the opening of different waterway valves; in addition, an ultrasonic vibration device 14 is provided at the outlet of the device.
When the device operates, the water inlet tap is firstly opened, so that water flow enters the water reservoir 12, when the water level reaches the water level which meets the operation of the water pump, the electromagnetic valve is opened through the operation panel, the water pump is started, at the moment, the water flow starts to enter the high-pressure dissolved oxygen tank 10, when the water level reaches the preset water level, namely, the hollow fiber membrane component 8 is submerged, the electromagnetic valve for oxygen is automatically opened, and oxygen enters the high-pressure dissolved oxygen tank 10 to be mixed with the water flow, so that high-concentration dissolved oxygen water is prepared.
In addition, the high-voltage power supply 20 and the water outlet ultrasonic vibration device 14 can be controlled to be turned on through a switch, so that the whole device can be operated under different setting conditions.
After the preparation of the high-concentration dissolved oxygen water is finished, firstly, a pressure relief valve is opened, the water level in the dissolved oxygen tank is reduced, an oxygen electromagnetic valve is closed, a water inlet tap of a reservoir is closed, and air inlet and water inlet are stopped. When the pressure gauge on the dissolved air tank indicates zero, the water inlet plunger pump is automatically closed, the water inlet electromagnetic valve is automatically closed, water inlet is stopped, and the operation of the equipment is stopped.
The concentration and stability of the dissolved oxygen in the water are important indexes for evaluating the preparation effect of the high-concentration dissolved oxygen water; in order to avoid influencing experimental results, the index measurement of the high-concentration dissolved oxygen water should be performed under the same external conditions.
(1) Measuring the concentration of dissolved oxygen in water:
the dissolved oxygen concentration in the high-concentration dissolved oxygen water prepared by the test is measured by adopting an oxygen dissolving instrument (JPB-607A), and the effective measuring range of the oxygen dissolving instrument is 0.0-20.0 mg/L, and the dissolved oxygen concentration in the high-concentration dissolved oxygen water is usually more than 20.0mg/L, so that the dissolved oxygen content in the high-concentration dissolved oxygen water is measured by adopting a method of proportionally diluting the high-concentration dissolved oxygen water by using deaerated membrane effluent.
The specific operation steps are as follows:
(1) 200mL of deaerated membrane effluent was taken and its dissolved oxygen concentration C was measured using an oxygen dissolving meter 1 ；
(2) Taking 50mL of the prepared high-concentration dissolved oxygen water sample, and adding 200mL of dissolved oxygen with the concentration of C into the water sample 1 The degassing membrane is used for discharging water, a probe of an oxygen dissolving instrument is used for stirring slowly and uniformly in a beaker, and after the reading of the oxygen dissolving instrument is stable, a reading C is recorded 2 ；
(3) Calculating the content of dissolved oxygen in the prepared high-concentration dissolved oxygen water: c (C) 0 ＝5C 2 -4C 1 。
(2) Determination of high concentration dissolved oxygen water stability
The test needs to determine the stability of high-concentration dissolved oxygen water from two aspects:
(1) and (3) filling the prepared high-concentration dissolved oxygen water into a 1000mL volumetric flask, and measuring the dissolved oxygen concentration of the water sample every 30min under the conditions of unsealing, normal temperature and normal pressure, and continuously measuring for 3 hours to measure the change condition of the dissolved oxygen concentration of the high-concentration dissolved oxygen water with time under the conditions of unsealing, normal temperature and normal pressure.
(2) The prepared high-concentration dissolved oxygen water is filled into a clean mineral water bottle, the volume of the mineral water bottle is about 550ml, and the mineral water bottle is filled into about 30 bottles. The method comprises the steps of firstly using high-concentration dissolved oxygen water for rinsing before sampling, closing a bottle cap after sampling, taking 3 bottles for measuring the dissolved oxygen concentration of a water sample once at the same time every day, taking an average value as a measurement result, and continuously measuring for 7 days to measure the change condition of the dissolved oxygen concentration of the high-concentration dissolved oxygen water along with time under normal temperature and normal pressure after sealing.
(3) Determination of gas-liquid ratio high concentration dissolved oxygen obtained by testPouring water into a measuring cylinder, standing the measuring cylinder on a horizontal table surface, and recording volume V 1 The method comprises the steps of carrying out a first treatment on the surface of the After the water sample is clarified, record volume V 2 The gas-liquid ratio of the high-concentration dissolved oxygen water is: η= (V 1 -V 2 )/V 1 。
The experimental design has the air inlet pressure range of 0.3 MPa-1.0 MPa, and every 0.1MPa is used as a research point. And taking a high-concentration dissolved oxygen water sample after fifteen minutes of stable operation of the equipment, and respectively measuring the gas-liquid ratio and the change condition of the dissolved oxygen concentration along with time.
FIG. 12 is a graph showing the relationship between the dissolved oxygen concentration of high-concentration dissolved oxygen water and the intake pressure, which is measured at 25℃and in the intake pressure range of 0.3MPa to 1.0 MPa.
Table 1 shows the gas-liquid ratio of high-concentration dissolved oxygen water under the condition of 1.0 MPa.
TABLE 1 gas-liquid ratio measurement (intake pressure 1.0 MPa)
。
Table 2 shows the change of the dissolved oxygen concentration with time at normal temperature and pressure without sealing the high-concentration dissolved oxygen water when the inlet air is 1.0 MPa.
TABLE 2 variation of dissolved oxygen concentration with time under unsealed condition (intake pressure 1.0 MPa)
。
Table 3 shows the change of the dissolved oxygen concentration with time at normal temperature and normal pressure when the high concentration dissolved oxygen water is sealed at an inlet gas pressure of 1.0 MPa.
TABLE 3 dissolved oxygen concentration change with time under sealed storage conditions (intake pressure 1.0 MPa)
。
The analysis test data can show that the dissolved oxygen content of the prepared high-concentration dissolved oxygen water is obviously improved along with the increase of the inlet pressure, and the high-concentration dissolved oxygen water has good stability. The analysis is because the pressure in the high-pressure dissolved oxygen tank 10 is increased due to the increase of the inlet pressure, and the saturated dissolved oxygen concentration of oxygen in water is increased with the increase of the pressure, and meanwhile, the oxygen stays in the water in the form of micro-nano bubbles due to the fact that the gas enters the water body through the hollow fiber membrane, so that the prepared high-concentration dissolved oxygen water has better stability.
The influence of air inlet pressure, electric field intensity, ultrasonic power and different water inflow types on the preparation of the high-concentration dissolved oxygen water in the preparation process of the high-concentration dissolved oxygen water by the applicant is as follows:
(1) The preparation of high-concentration dissolved oxygen water is facilitated by properly increasing the inlet pressure of oxygen. When the air inlet pressure is 1.0MPa, the prepared high-concentration dissolved oxygen water has the highest dissolved oxygen concentration of 51.6mg/L, and under the unsealed condition, the dissolved oxygen concentration still can reach 33.7mg/L after 3 hours, and under the sealed condition, the dissolved oxygen concentration still can reach more than 30mg/L after being preserved for seven days. The analysis is that the increase of the inlet pressure is equivalent to the increase of the concentration difference between the gas phase and the liquid phase oxygen, so that the mass transfer efficiency of the gas and the liquid is increased, and the concentration of the dissolved oxygen in the high-concentration dissolved oxygen water is increased.
(2) An electric field is added to the air inlet pipeline, and when the voltage reaches 20KV, the concentration of the high-concentration dissolved oxygen water can reach 53.6mg/L at maximum; an electric field is applied to the water inlet pipeline, the concentration of dissolved oxygen in the high-concentration dissolved oxygen water is 50.4mg/L at most, and the influence of the electric field on the concentration of the dissolved oxygen is not great when the water inlet pipeline is added. The change trend of the dissolved oxygen concentration is available, when an electric field is applied to the air inlet pipeline, the dissolved oxygen concentration slightly increases along with the increase of the voltage, but the effect of the dissolved oxygen concentration is not obvious. Under normal temperature and normal pressure, after 3 hours, the content of dissolved oxygen in the high-concentration dissolved oxygen water can still reach 31.9mg/L; under the sealing condition, after seven days, the content of the dissolved oxygen in the high-concentration dissolved oxygen water can still exceed 27.6mg/L.
(3) Under the condition that the air inlet pressure is 1.0MPa, an ultrasonic device is arranged on the water outlet of the high-pressure dissolved air tank, under the action of ultrasonic waves, the maximum dissolved oxygen concentration of the prepared high-concentration dissolved oxygen water is 62.0mg/L, after the ultrasonic power exceeds 60% of the maximum power, the temperature of the water outlet rises after fifteen minutes of operation, the ultrasonic waves generate a relatively obvious thermal effect, and the dissolved oxygen concentration of the high-concentration dissolved oxygen water is reduced. When the ultrasonic power is 60%, the dissolved oxygen content in the high-concentration dissolved oxygen water can still reach 35.2mg/L after the ultrasonic power is not sealed and is at normal temperature and normal pressure for 3 hours; under sealed conditions, after seven days, the content of dissolved oxygen in the high-concentration dissolved oxygen water is 33.9mg/L. Therefore, the test can obtain that the ultrasonic wave has an effect on improving the dissolved oxygen of the high-concentration dissolved oxygen water, and the analysis is that partial liquid is stretched under partial stress under the action of the ultrasonic wave in an ultrasonic device so as to form negative pressure, and partial escaped oxygen is redissolved at the air-water interface in the device. However, when the power is too high, the stability of the high-concentration dissolved oxygen water is affected by the ultrasonic thermal effect.
(4) In the test, common tap water, RO membrane effluent and degassing membrane effluent are used as water sources to prepare high-concentration dissolved oxygen water, and the content of dissolved oxygen in the high-concentration dissolved oxygen water is increased along with the reduction of the concentration of dissolved salts or gases contained in the inlet water. In particular, the content of dissolved oxygen in the high-concentration dissolved oxygen water prepared by using the deaeration membrane effluent is about 10 percent higher than that of common tap water.
(5) The device can prepare high-concentration dissolved oxygen water with the dissolved oxygen concentration of 50 mg/L-60 mg/L, the dissolved oxygen concentration can still reach more than 30mg/L after 3 hours of preparation, and the dissolved oxygen concentration can still reach more than 20mg/L after the sealed bottle mouth is stored for seven days at normal temperature and normal pressure.
For facilitating engineering application, the experimental equipment is integrated in a container, the front part of the container is provided with an electric automatic control system, one side in the container is provided with a high-concentration dissolved oxygen water preparation system, the other side is provided with a simulated pool of black and odorous lakes, the size of the pool is 2.0mx1mx1.5m, and the effective volume is 3m 3 。
The test is to additionally arrange a simulation pool with the same size outside the container for comparison test.
The prepared high-concentration dissolved oxygen water passes through a copper pipe with the length of 5m and is injected into a water tank through a plastic hose, and the water outlet flow of the high-concentration dissolved oxygen water is 0.2L/min.
Two groups of black and odorous lake simulation pools with equal volumes are arranged in the test; under the optimal condition of preparing high-concentration dissolved oxygen water, namely that the air inlet pressure is 1.0MPa and the ultrasonic power is 60%, the prepared high-concentration dissolved oxygen water is injected into a simulation pool from a position of 10cm on bottom mud at the same time every day, the injection flow of the high-concentration dissolved oxygen water is 0.2L/min, and each time of operation is carried out for 4 hours; the control blank group is set at the same time every day, and clean water is injected into the simulation pool at the flow rate of 0.2L/min, so that the running time is also ensured to be 4 hours.
The two experiments were run simultaneously for 10 days, respectively, and DO and COD of the water in the simulated pool were measured daily before the injection of the high-concentration dissolved oxygen water, and after the start of the injection Cr Under the condition, the influence of high-concentration dissolved oxygen water on the water quality index of the black and odorous lake is explored. In order to supplement the water lost in the process of simulating the evaporation and sampling of the black and odorous lakes in a natural state, 5L of black and odorous lake water samples are supplemented into the water pool every day in the test process.
After high-concentration dissolved oxygen water is injected into a water sample, monitoring the change of water quality indexes in the water sample in the injection process and at the same time every day, and obtaining the following conclusion:
(1) In the process of injecting dissolved oxygen water, the concentration of the dissolved oxygen in the water body is increased from 0.2mg/L to 2.3mg/L; meanwhile, dissolved oxygen water is injected for 4 hours every day, and the concentration of the dissolved oxygen in the water sample is increased to 3.1mg/L from the 4 th day within 10d monitored in the test, and then the concentration of the dissolved oxygen in the water sample tends to be stable. Whereas the dissolved oxygen concentration in the control group remained essentially unchanged. The high-concentration dissolved oxygen water has obvious oxygenation effect on the water body. Meanwhile, because oxygen in the high-concentration dissolved oxygen water exists in the form of micro-nano bubbles, the dissolved oxygen concentration of the water body is increased at a relatively stable rate for the water body.
(2) After the high-concentration dissolved oxygen water is used for treating the black and odorous lake water sample, the removal rates of COD, ammonia nitrogen and TP of the water sample are respectively 70.3%, 48.1% and 59.9% after the operation is stable, and from the aspect of treatment effect, the dissolved oxygen index of the water sample is improved from the inferior class V to the dissolved oxygen limit value superior to that of class IV water within ten days of the operation of the test. Meanwhile, in the treatment process, as the high-concentration dissolved oxygen water is slowly added into the water body, compared with the conventional aeration mode, more macro large bubbles are not generated in the water, so that the disturbance to the sediment is not large, and the escape of malodorous gas is reduced to a certain extent.
(3) The equipment has higher integration level, and is convenient to transport when being used as a temporary processing device; when the device is used as a long-term maintenance device, the occupied area of the device in practical application is small, and the device is only 1m 2 And meanwhile, the equipment has the advantages of almost no investment in civil engineering cost in the early stage, so that the equipment has a certain advantage in engineering application.
Example 2: a vortex tube 22 is installed in the high-pressure dissolved air tank 10.
Cavitation is the process in which when the local pressure in a liquid is reduced, a cavity (cavitation) is formed by gas in the liquid or at the solid-liquid interface, and the cavitation grows and finally collapses. Vortex street cavitation is that when fluid bypasses a certain object, two sides of the object periodically fall off double-line vortex with opposite rotation directions and regular arrangement, and cavitation effect is generated in the double-line vortex by the fluid, so that micro-nano bubbles are generated.
The vortex street pipe 22 is formed by connecting two or more vortex street spray heads in series through pipelines, the vortex street spray heads comprise an inner pipe 24 and an outer pipe 23, a spiral groove 27 structure is arranged in the inner pipe 24, the outer pipe 23 is formed by hollow small pipes 25 which are uniformly distributed at intervals, a gasket 26 is arranged on the upper portion of the spiral groove 27, and a partition is arranged in the middle of the gasket 26.
The front view of the vortex street spray head is in a trapezoid structure, and a partition is arranged in the middle of the gasket 26, so that gas and liquid are split to form a vortex street.
Tap water is initially filtered by the filter 4, and is injected into the high-pressure dissolved air tank 10 by the plunger pump 6, and air flow and water flow are mixed at the inlet of the high-pressure dissolved air tank 10. The mixed gas-water mixed fluid passes through the serial vortex street pipe 22, and in the vortex street pipe 22, as the gas-water mixed fluid generates vortex under the action of vortex street, cavitation effect is generated in the vortex by the fluid, and cavities are formed in the fluid flow, so that oxygen exists in water in the form of tiny bubbles. Meanwhile, as the whole process is in a high-pressure state, the saturated solubility of oxygen in water is increased, so that the oxygen content of high-concentration dissolved oxygen water is improved.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the application and is not intended to limit the application, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (5)
1. The black and odorous water body treatment device comprises a gas circuit, a water circuit and a high-pressure dissolved air tank (10), and is characterized in that a vortex street pipe (22) is arranged in the high-pressure dissolved air tank (10);
the vortex street pipe (22) is formed by connecting two or more vortex street spray heads in series through pipelines, the vortex street spray heads comprise an inner pipe (24) and an outer pipe (23), spiral grooves (27) are formed in the inner pipe (24), the outer pipe (23) is formed by hollow small pipes (25) which are uniformly distributed at intervals, a gasket (26) is arranged at the upper part of each spiral groove (27), and a partition is arranged in the middle of each gasket (26);
the gas circuit pipeline is provided with a high-voltage electrode (3); the upper part of the high-pressure dissolved air tank (10) is respectively connected with an air circuit pipeline and a water circuit pipeline; the lower part of the high-pressure dissolved air tank (10) is connected with an ultrasonic vibration device (14) through a pipeline, the ultrasonic vibration device (14) is connected with an oxygen dissolving water outlet pipeline, and the oxygen dissolving water outlet pipeline is connected with a diffusing pipe (15);
the diffusing pipe (15) is a rotational flow diffusing pipe, and the rotational flow diffusing pipe is composed of two dissolved oxygen water inlets (16) and one dissolved oxygen water outlet (17); the cyclone diffusing pipe is internally provided with a conical cavity.
2. The black and odorous water body treatment device according to claim 1, characterized in that a water reservoir (12), a filter (4), a flowmeter (5) and a plunger pump (6) are arranged on the waterway pipeline, and a degassing membrane component (13) is arranged on the pipeline at the rear part of the filter (4); a high-voltage electrode (3) is arranged on a pipeline at the rear part of the plunger pump (6).
3. The black and odorous water body treatment device according to claim 1, characterized in that the lower part of the high-pressure dissolved air tank (10) is also connected with an oxygen supplementing pipeline, and an oxygen supplementing valve (7) is arranged on the oxygen supplementing pipeline.
4. The black and odorous water body treatment device according to claim 1, characterized in that the inside of the high-voltage electrode (3) is a stainless steel electrode (19), the outside of the stainless steel electrode (19) is an insulating layer (18), the stainless steel electrode (19) is fixed in the insulating layer (18) by an insulating bracket (21), and the stainless steel electrode (19) is connected with a high-voltage power supply (20).
5. The black and odorous water body treatment device according to claim 1, wherein a floating ball level gauge (9) is arranged at the upper part of the high-pressure dissolved air tank (10), and a pressure relief valve (11) is arranged at the lower part of the high-pressure dissolved air tank.
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