CN115159666A - Black and odorous water body treatment device - Google Patents
Black and odorous water body treatment device Download PDFInfo
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- CN115159666A CN115159666A CN202210887028.6A CN202210887028A CN115159666A CN 115159666 A CN115159666 A CN 115159666A CN 202210887028 A CN202210887028 A CN 202210887028A CN 115159666 A CN115159666 A CN 115159666A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a black and odorous water body treatment device. The device comprises a gas path, a water path and a high-pressure gas dissolving tank (10), wherein a hollow fiber membrane component (8) or a vortex street tube (22) is arranged in the high-pressure gas dissolving tank (10), and a high-pressure electrode (3) is arranged on a gas path pipeline; the upper part of the high-pressure dissolved air tank (10) is respectively connected with an air path pipeline and a water path 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 diffusion pipe (15). The invention adopts three modes of the hollow fiber membrane, the vortex street tube and the ultrasonic cavitation to prepare the high-concentration oxygen-dissolved water, and injects the high-concentration oxygen-dissolved water into the black and odorous water body to be treated through the vortex diffusing tube, thereby rapidly and uniformly improving the solubility of the oxygen in the water body, improving the activity of microorganisms and reducing the indexes of pollutants.
Description
Technical Field
The invention 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-purification function of the water body reaches the limit, the water quality is deteriorated, and the sense organ of the water body becomes black and smelly. The black and odorous water body not only brings uncomfortable sensory feeling to people, but also has great influence on physical and psychological health of people. Therefore, the research of the black and odorous water treatment technology with less investment, quick response and no secondary pollution meets the current development trend.
At present, the causes of black and odorous urban water bodies can be mainly summarized into discharge of exogenous pollutants, release of endogenous pollution, insufficient hydrodynamic conditions and damage to biodiversity in the water bodies; the current technical means for treating black and odorous water mainly comprise exogenous pollutant interception, endogenous treatment and ecological restoration.
Aeration oxygenation technology is an important technical measure for improving water quality of black and odorous water and is mainly applied to three conditions in black and odorous water treatment. The first is to perform manual oxygenation for solving the organic pollution of water before the foreign source interception is not completely solved; the second is that after the interception of the exogenous pollution is finished, the water body is still in an anoxic state, and the self-purification capacity of the water body is recovered by artificial oxygenation; the third is to arrange an emergency aeration device in the treated water body to deal with sudden pollution of the water body, such as urban rain and sewage mixed overflow caused by continuous strong rainfall into the water body. The aeration engineering examples at home and abroad are summarized by research, and the aeration and oxygenation technology can achieve the aims of eliminating black and odorous substances, reducing water body pollution and promoting ecological restoration.
By combining various engineering practices at home and abroad, aeration and oxygenation are technologies which can effectively eliminate black and odorous water, reduce water pollution, clean without secondary pollution and have low investment, and have wide prospects in black and odorous water treatment.
Traditional blast aeration and surface of water mechanical aeration are not only inefficient, the energy consumption is high, and the bubble diameter of production is millimeter or even centimetre level, causes surface of water disturbance and foul gas to volatilize to such bubble can rise the surface of water soon and break and disappear after aquatic production.
In recent years, micro-nano bubble technology has become one of the research hotspots; the micro-nano bubbles have the characteristics of small diameter, long retention time in water, strong oxidizability and the like.
Oxygen can be more effectively injected into the polluted water body through the micro-nano bubbles and even can be diffused and sunk into the sediment, so that the growth of anaerobic bacteria is effectively inhibited, and the efficient treatment of the odorous water body is realized.
Wangmeili and the like utilize a micro-nano aeration device to treat black and odorous water, and compare the treatment effects of different aeration amounts, the removal efficiency under the air flow of 0.3L/min is found to be the highest, and the removal rates of COD, ammonia nitrogen and TP reach 51.4%, 55.8% and 31.0% respectively when the black and odorous water is treated for 90 min.
QiYupeng and the like research the effect of purifying water quality of the carbon fiber wet-ground type artificial floating bed under micro-nano aeration and micro-pore aeration, and discover that under the condition of the same hydraulic retention time and air-water ratio, 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%, which are all higher than those of a micro-pore aeration group, and the film hanging process of carbon fiber filler can be completed in a shorter time.
The preparation of high-concentration oxygen-dissolved water by forming micro-nano bubbles has extremely high research prospect, but at present, no example for directly treating black and odorous water by using the high-concentration oxygen-dissolved water exists.
At present, micro-nano bubbles are manufactured mainly by a dissolved air release method, a hydrodynamic cavitation method and an ultrasonic cavitation method.
The gas dissolving and releasing method is to dissolve gas in water in a pressurizing mode to form a supersaturated state, and then release gas in a pressure reducing mode to generate a large amount of micro-bubbles. The size and strength of the bubbles depend on various conditions when the air is released and the surface tension of the water.
The hydrodynamic cavitation method is characterized in that a vortex in a turbulent flow state is manufactured, so that oxygen is continuously sheared by water flow after entering the vortex to form micro bubbles; the hydrodynamic cavitation method has the characteristics of low energy consumption, no secondary pollution and the like; however, the method has high requirements on equipment and high processing difficulty.
The ultrasonic cavitation method mainly utilizes the fact that when liquid receives the action of sound wave negative pressure, the distance between medium molecules exceeds the critical molecular distance which keeps the liquid medium unchanged, and the liquid medium is broken to form cavitation bubbles. Cavitation can be divided into stable cavitation and transient cavitation. The steady-state cavitation is mostly generated at lower acoustic pressure, and the cavitation bubbles can be kept in a relatively stable state and can be kept for a plurality of cycles without collapse. Transient cavitation generally occurs under the action of high acoustic pressure, which generates high temperature and high pressure, so that water molecules are decomposed to generate hydroxyl radicals. The existing ultrasonic cavitation method can not continuously generate micro bubbles, and has the defects of high energy consumption, easy heating during continuous work, low efficiency and the like.
Disclosure of Invention
The invention aims to provide a black and odorous water body treatment device aiming at the defects in the prior art.
The technical solution of the invention 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 through the hollow fiber membranes in a diffusion mode under the high-pressure condition by utilizing the characteristics of air permeability and water impermeability of the hollow fiber membranes, so that high-concentration dissolved oxygen water with higher dissolved oxygen concentration is prepared.
The technical scheme of the invention is designed based on the following principle, the essence of the aeration of the high-concentration dissolved oxygen water is the gas mass transfer process, and oxygen in micro-nano bubbles needs to pass through a two-phase interface and transfer mass through diffusion.
Diffusion principle of gas and liquid in hollow fiber membrane: the rate of oxygen transfer through the hollow fibers into a unit of water is mathematically expressed as follows:
in the formula:Mis the oxygen mass transfer rate, mol/(L.h);
Kthe total mass transfer coefficient is m/h;
Ais the surface area of the fibrous membrane, m 2 ；
To increase the mass transfer rate of oxygen in water, the total mass transfer coefficient needs to be increasedKAnd the difference in oxygen concentration between the gas and liquid phases.
For increasing the difference in oxygen concentration between the gas and liquid phases, this can be achieved by suitably increasing the feed gas pressure. Because of the fact thatSuitably increasing the pressure of the inlet air corresponds to increasing
However, in the case of hollow fiber membranes, when the pressure is too high, bubbles are generated on the surface of the membrane when the bubble point is exceeded, and the mass transfer efficiency is reduced.
For hollow fiber membranes, the total mass transfer coefficientKThe mathematical expression can be expressed as follows:
in the formula:
is the liquid film coefficient, mol/(m) 2 ·s)；
Coefficient of liquid film
Diffusion coefficient of oxygen in water
And thickness of the concentration boundary layer
The relationship of (a) to (b) is as follows:
from the above formula, it can be seen that, for oxygen,
and is negligible.
As shown in figure 2 of the attached drawings of the specification, at the die hole of the hollow fiber membrane, the transfer coefficient of the membrane is determined
Since there is no barrier of the film, the effect of the film can be ignored, and at this time
Which can be seen as infinity, but at non-membrane pores,
can be approximately regarded as zero, at the same time
Decreases with increasing ratio of pore surface area to total surface area of the fibrous membrane.
The gas molecules are generally neutral, and in the presence 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 charge, and the process is called as a charge process.
Various free electrons are formed by 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 the charging is realized.
According to theoretical calculation, as the electric field intensity increases, the saturation charge amount also increases.
The cavitation phenomenon is a process in which when the local pressure in the liquid is reduced, a gas in the liquid or on a solid-liquid interface forms a cavity (cavitation bubble), develops and becomes large, and finally collapses. Cavitation can be generally classified into hydrodynamic cavitation and hydrodynamic cavitation.
The acoustic dynamic cavitation is to utilize the transmission of ultrasonic waves in water to cause vibration, and local tensile stress is generated in liquid, so that negative pressure is formed, and gas dissolved in water is changed into a supersaturated state, and then bubbles are formed.
According to the above-mentioned related principles, two methods are mainly involved for preparing high-concentration oxygen-dissolved water: (1) high-pressure air inlet improves oxygen transfer efficiency; (2) the oxygen molecules are polarized by using the ultrahigh voltage electric field, so that the oxygen is more easily combined with the water molecules; (3) the micro-aperture of the hollow fiber membrane is utilized to reduce the size of oxygen molecular groups.
A black and odorous water body treatment device comprises a gas path, a water path and a high-pressure gas dissolving tank, wherein a hollow fiber membrane component or a vortex street pipe is installed in the high-pressure gas dissolving tank, and a high-pressure electrode is arranged on a gas path pipeline; the upper part of the high-pressure dissolved air tank is respectively connected with an air path pipeline and a water path 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 a dissolved oxygen water outlet pipeline, and the dissolved oxygen water outlet pipeline is connected with a diffusion pipe.
According to the embodiment of the invention, a reservoir, a filter, a flowmeter and a plunger pump are arranged on the water 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 invention, 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 invention, the diffusing pipe is a rotational flow diffusing pipe which consists of two dissolved oxygen water inlets and one outlet; the interior of the rotational flow diffusing pipe is a conical cavity.
According to the embodiment of the invention, the vortex street pipe is formed by connecting two or more vortex street spray heads in series through a pipeline, 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 distributed at intervals, gaskets are arranged on the upper parts of the spiral grooves, and partitions are arranged in the middles of the gaskets.
According to the embodiment of the invention, the stainless steel electrode is arranged inside the high-voltage electrode, the insulating layer is arranged outside the stainless steel electrode, the stainless steel electrode is fixed in the insulating layer through the insulating support, and the stainless steel electrode is connected with the 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 release valve.
The invention adopts three modes of the hollow fiber membrane, the vortex street tube and the ultrasonic cavitation to prepare the high-concentration oxygen-dissolved water, and injects the high-concentration oxygen-dissolved water into the black and odorous water body to be treated through the vortex diffusing tube, thereby rapidly and uniformly improving the solubility of the oxygen in the water body, improving the activity of microorganisms and reducing the indexes of pollutants.
Drawings
Fig. 1 is a structural view of a black and odorous water body treatment device using a hollow fiber membrane module.
Fig. 2 is a schematic diagram of oxygen diffusion into water in a hollow fiber membrane.
FIG. 3 is a schematic diagram of gas-liquid exchange of a hollow fiber membrane.
FIG. 4 is a detailed view of the pores of a hollow fiber membrane.
FIG. 5 is a view showing the structure of a diffusing pipe.
Fig. 6 is a diagram of a high voltage electrode structure.
FIG. 7 is a view showing the structure of a vortex street.
Figure 8 is a front view of a vortex street tube.
Fig. 9 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 8.
Fig. 10 is a sectional view B-B of fig. 8.
Fig. 11 is a perspective view of the spiral groove.
FIG. 12 is a graph showing the change in dissolved oxygen concentration with intake air pressure (25 ℃ C.).
In the figure: 1-an oxygen cylinder; 2-a pressure gauge; 3-a high voltage electrode; 4-a filter; 5-a flow meter; 6-plunger pump; 7-oxygen supplementary valve; 8-a hollow fiber membrane module; 9-a floating ball liquid level meter; 10-high pressure dissolved air tank; 11-a pressure relief valve; 12-a water reservoir; 13-a degassing membrane module; 14-ultrasonic vibration means; 15-a diffusing pipe; 16-dissolved oxygen water inlet; 17-an outlet for dissolved oxygen water; 18-an insulating layer; 19-stainless steel electrodes; 20-a high voltage power supply; 21-an insulating support; 22-vortex street tube; 23-an outer tube; 24-an inner tube; 25-tubules; 26-a gasket; 27-spiral groove.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1: a black and odorous water body treatment device comprises a gas path, a water path 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 path pipeline and a water path 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 dissolved water outlet pipeline, and the oxygen dissolved water outlet pipeline is connected with a diffusion pipe 15.
A reservoir 12, a filter 4, a flowmeter 5 and a plunger pump 6 are arranged on the water pipeline, and a degassing membrane component 13 is arranged on the pipeline behind the filter 4; a high voltage electrode 3 is arranged on a 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 supplement pipeline, and the oxygen supplement pipeline is provided with an oxygen supplement valve 7.
The diffusing pipe 15 is a rotational flow diffusing pipe which is composed of two dissolved oxygen water inlets 16 and one dissolved oxygen water outlet 17; the interior of the rotational flow diffusing pipe is a conical cavity.
The high-voltage electrode 3 is internally 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 through 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 gas dissolving tank 10 is provided with a floating ball liquid level meter 9, and the lower part is provided with a pressure release valve 11.
The high-pressure vessel 10 used in the test had an outer diameter of 426mm, a straight length of 1300mm and an effective volume of about 160L.
In order to measure the mixture pressure and the intake pressure in the high-pressure vessel 10, pressure gauges 2 with a precision of 1.5 are respectively installed on the high-pressure vessel 10 and the gas path.
The gas passes through the hollow fiber membrane module 8 in the high-pressure vessel 10 to exchange with the liquid according to the principle shown in fig. 3 and 4.
The test needs to explore the influence of different properties of the inlet water on the preparation of the high-concentration oxygen-dissolved water, so that three types of inlet water, namely common tap water, RO membrane outlet water and degassing membrane outlet water, are adopted.
During the test, ordinary tap water and RO membrane effluent are stored in a reservoir 12 of 500X 300X 500mm to ensure the 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.
A black and odorous water body treatment device, gas and water flow enter a high-pressure dissolved air tank 10 through a gas path and a water path respectively, 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 electrodes 3 of the ultrahigh-voltage electric field on the air path and the water path, so that 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 water outlet of the device.
When the device is operated, the water inlet tap is firstly opened to enable water flow to enter the reservoir 12, when the water level reaches the water level meeting the operation of the water pump, the electromagnetic valve is opened through the operation panel, the water pump is started, the water flow starts to enter the high-pressure container tank 10 at the moment, when the water level reaches the preset water level and submerges the hollow fiber membrane component 8, the oxygen electromagnetic valve is automatically opened, oxygen enters the high-pressure container tank 10 to be mixed with the water flow, and therefore high-concentration oxygen-dissolved water is prepared.
In addition, the high voltage power supply 20 and the outlet ultrasonic vibration device 14 can be switched on by a switch, so that the whole device can operate under different setting conditions.
After the preparation of the high-concentration oxygen-dissolved water is finished, the pressure relief valve is opened firstly, the water level in the dissolved air tank is reduced, the oxygen electromagnetic valve is closed, the water inlet tap of the reservoir is closed, and air inlet and water inlet are stopped. When the reading of the pressure gauge on the high-pressure gas dissolving tank 10 is zero, the water inlet plunger pump 6 is automatically closed, the water inlet electromagnetic valve is automatically closed, water inlet is stopped, and the equipment stops running.
The concentration and stability of the dissolved oxygen in water are important indexes for evaluating the preparation effect of the high-concentration dissolved oxygen water; in order to avoid the influence on the experimental result, the index measurement of the high-concentration oxygen-dissolved water is carried out under the condition that the external conditions are the same.
(1) And (3) measuring the concentration of dissolved oxygen in water:
the dissolved oxygen concentration in the high-concentration dissolved oxygen water prepared in the test is measured by using an oxygen dissolving instrument (JPB-607A), and the effective measuring range of the oxygen dissolving instrument is 0.0-20.0 mg/L, while the dissolved oxygen concentration in the high-concentration dissolved oxygen water is usually more than 20.0mg/L, so the dissolved oxygen content in the water is measured by using a method of diluting the high-concentration dissolved oxygen water by degassing membrane effluent according to a proportion.
The specific operation steps are as follows:
(1) 200mL of degassed membrane effluent was taken and measured for dissolved oxygen concentration using a dissolved oxygen meter
；
(2) Taking 50mL of prepared high-concentration dissolved oxygen water sample, and adding 200mL of dissolved oxygen water sample with the dissolved oxygen concentration of
The oxygen dissolving instrument probe is used for slowly stirring in a beaker at a constant speed, and after the reading of the oxygen dissolving instrument is stable, the reading is recorded
；
(3) Calculating the content of dissolved oxygen in the prepared high-concentration dissolved oxygen water:
。
(2) Determination of stability of high-concentration oxygen-dissolved Water
The test needs to measure the stability of the high-concentration oxygen-dissolved water from two aspects:
(1) the prepared high-concentration oxygen-dissolved water is filled in a volumetric flask with the volume of 1000mL, so that the dissolved oxygen concentration of the water sample is measured every 30min under the conditions of no sealing, normal temperature and normal pressure, and the change condition of the dissolved oxygen concentration of the high-concentration oxygen-dissolved water along with time under the conditions of no sealing, normal temperature and normal pressure is measured for 3h continuously.
(2) The prepared high concentration dissolved oxygen water was filled in about 30 bottles of clean mineral water bottle having a volume of about 550 ml. The method comprises the following steps of firstly rinsing with high-concentration dissolved oxygen water before sampling, tightly covering a bottle cap after sampling, taking 3 bottles at the same time every day to measure the dissolved oxygen concentration of a water sample, 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 the conditions of sealing and normal temperature and pressure.
(3) Gas-liquid ratio determination
Pouring the high-concentration oxygen-dissolved water prepared in the test into a measuring cylinder, standing the measuring cylinder on a horizontal table, and recording the volume
(ii) a After the water sample is clarified, recording the volume
And the gas-liquid ratio of the high-concentration oxygen-dissolved water is as follows:
。
the experimental design has the inlet pressure range of 0.3MPa to 1.0MPa, and every 0.1MPa is taken as a research point. Taking a high-concentration dissolved oxygen water sample after the equipment stably operates for fifteen minutes each time, 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 variation of the dissolved oxygen concentration in a high concentration oxygen-dissolved water with the intake air pressure, measured at 25 ℃ under the intake air pressure ranging from 0.3MPa to 1.0 MPa.
Table 1 shows the gas-liquid ratio of high-concentration oxygen-dissolved water at 1.0MPa
。
Table 2 shows the change of the dissolved oxygen concentration with time at normal temperature and normal pressure when the high concentration oxygen-dissolved water is not sealed when the inlet air is 1.0 MPa.
Table 3 shows the change of the concentration of dissolved oxygen with time in a sealed high concentration oxygen-dissolved water at an intake pressure of 1.0MPa at normal temperature and pressure.
Analysis and test data show that the dissolved oxygen content of the prepared high-concentration oxygen-dissolved water is obviously improved along with the increase of the air inlet pressure, and the high-concentration oxygen-dissolved water has good stability. The analysis is that the pressure in the high-pressure container 10 is increased due to the increase of the inlet pressure, the saturated dissolved oxygen concentration of the oxygen in the water is increased along with the increase of the pressure, and meanwhile, the oxygen stays in the water in the form of micro-nano bubbles because the gas enters the water body through the hollow fiber membrane, so that the prepared high-concentration dissolved oxygen water has better stability.
The applicant obtains the following conclusions about the influence of air inlet pressure, electric field intensity, ultrasonic power and different water inlet types on the preparation of the high-concentration oxygen-dissolved water in the preparation process of the high-concentration oxygen-dissolved water:
(1) The preparation of the high-concentration oxygen-dissolved water is facilitated by properly increasing the intake pressure of the oxygen. When the air inlet pressure is 1.0MPa, the dissolved oxygen concentration of the prepared high-concentration oxygen-dissolved water is highest and is 51.6mg/L, the dissolved oxygen concentration can still reach 33.7mg/L after 3 hours under the unsealed condition, and the dissolved oxygen concentration can still reach over 30mg/L after the high-concentration oxygen-dissolved water is stored for seven days under the sealed condition. The analysis is that the gas inlet pressure is increased, namely the concentration difference between gas-phase oxygen and liquid-phase oxygen is increased, so that the gas-liquid mass transfer efficiency is increased, and the dissolved oxygen concentration in the high-concentration dissolved oxygen water is increased.
(2) An electric field is added in the air inlet pipeline, and when the voltage reaches 20KV, the concentration of the high-concentration oxygen-dissolved water can reach 53.6mg/L at most; an electric field is additionally arranged outside 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 added by the water inlet pipeline on the concentration of the dissolved oxygen is small. The change trend of the dissolved oxygen concentration can be obtained, when an electric field is applied to the air inlet pipeline, the dissolved oxygen concentration is slightly increased along with the rise of voltage, but the effect of promoting the dissolved oxygen concentration is not obvious. The content of dissolved oxygen in high-concentration dissolved oxygen water can still reach 31.9mg/L after 3 hours under the conditions of no sealing and normal temperature and normal pressure; under the sealing condition, the content of dissolved oxygen in high-concentration dissolved oxygen water can still exceed 27.6mg/L after seven days.
(3) In the test, under the condition that the air inlet pressure is 1.0MPa, an ultrasonic device is arranged on the water outlet of a high-pressure dissolved oxygen tank, the dissolved oxygen concentration of the prepared high-concentration dissolved oxygen water is 62.0mg/L at most under the action of ultrasonic waves, and after the ultrasonic power exceeds 60% of the maximum power and the operation is carried out for fifteen minutes, the water outlet temperature is increased, the ultrasonic waves generate obvious thermal effect, and the dissolved oxygen concentration of the high-concentration dissolved oxygen water is reduced. When the ultrasonic power is 60%, the content of dissolved oxygen in high-concentration dissolved oxygen water can still reach 35.2mg/L after 3 hours under the conditions of no sealing, normal temperature and normal pressure; under the sealing condition, after seven days, the content of the 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 dissolution of oxygen by high-concentration dissolved oxygen, and the analysis is that partial liquid is locally stressed and stretched under the action of the ultrasonic wave in an ultrasonic device to form negative pressure, and partial escaped oxygen is dissolved again at a gas-water interface in the device. However, when the power is too high, the stability of the high-concentration oxygen-dissolved water is affected by the thermal effect of the ultrasonic wave.
(4) In the experiment, common tap water, RO membrane effluent and degassing membrane effluent are respectively used as water sources to prepare high-concentration oxygen-dissolved water, and the content of dissolved oxygen in the high-concentration oxygen-dissolved water is increased along with the reduction of the concentration of dissolved salts or gas contained in the influent water. In particular, the content of dissolved oxygen in high-concentration dissolved oxygen water prepared by using the effluent of the degassing membrane is about 10 percent higher than that of common tap water.
(5) The device can be used for preparing high-concentration oxygen-dissolved water with the dissolved oxygen concentration of 50-60 mg/L, the dissolved oxygen concentration can still reach over 30mg/L after 3 hours of preparation, and the dissolved oxygen concentration can still reach over 20mg/L after the high-concentration oxygen-dissolved water is stored for seven days at normal temperature and normal pressure of a sealed bottle opening.
For facilitating engineering application, 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 a high-concentration oxygen-dissolved water preparation system, the other side in the container is a simulation water tank of a black and odorous lake, the size of the water tank is 2.0m multiplied by 1m multiplied by 1.5m, and the effective volume is 3m for carrying out labor cultivation.
In the test, a simulation pool with the same size is additionally arranged outside the container for carrying out a comparison test.
The prepared high-concentration oxygen-dissolved water passes through a copper tube with the length of 5m and then is injected into a water pool through a plastic hose, and the water outlet flow of the high-concentration oxygen-dissolved water is 0.2L/min.
Two groups of black and odorous lake simulation pools with the same volume are arranged in the test; injecting the prepared high-concentration oxygen-dissolved water into a simulation pool from a position 10cm above the bottom sediment at the same time every day under the optimal conditions of high-concentration oxygen-dissolved water preparation, namely, the air inlet pressure is 1.0MPa and the ultrasonic power is 60%, wherein the injection flow of the high-concentration oxygen-dissolved water is 0.2L/min, and the operation is carried out for 4 hours each time; the control blank group is set to inject clean water into the simulation pool at the same time every day at the flow rate of 0.2L/min, and the running time is also ensured to be 4h.
Two groups of experiments are respectively operated for 10 days at the same time, and DO and COD of the upper water in the simulation pond are measured before the high-concentration oxygen-dissolved water is injected and after the high-concentration oxygen-dissolved water is injected every day Cr Ammonia nitrogen and total phosphorus indexes, and the influence of high-concentration dissolved oxygen water on the water quality indexes of the covering water of the black and odorous lake under the condition is researched. For supplementing losses in the evaporation and sampling process of simulated black and odorous lakes in natural conditionsAnd (4) water quantity, wherein 5L of black and odorous lake water sample is supplemented into the water tank every day in the test process.
After high-concentration oxygen-dissolved water is injected into a water sample, the change of the water quality index in the water sample in the injection process and at the same time every day is monitored, and the obtained conclusion is as follows:
(1) In the process of injecting the dissolved oxygen water, the concentration of the dissolved oxygen in the water body is increased from 0.2mg/L to 2.3mg/L; meanwhile, 4h of dissolved oxygen water is injected every day, the dissolved oxygen concentration in the water sample is increased to 3.1mg/L from the 4 th day within 10d monitored by the test, and then the dissolved oxygen concentration of the water sample tends to be stable. While the dissolved oxygen concentration in the control group remained essentially unchanged. The oxygen increasing effect of the high-concentration oxygen-dissolved water on the water body is obvious. Meanwhile, because the 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 speed.
(2) The high-concentration dissolved oxygen water is used for treating a black and odorous lake water sample, after the operation is stable, the removal rates of COD, ammonia nitrogen and TP in the water sample are respectively 70.3%, 48.1% and 59.9%, and from the treatment effect, the dissolved oxygen index of the water sample is increased from the inferior V class to the dissolved oxygen limit value superior to the IV class water within ten days of the operation of the experiment. Meanwhile, in the treatment process, because the high-concentration oxygen-dissolved 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 on the bottom sludge is small, 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 treatment device; when the device is used as a long-term maintenance device, the occupied area of the equipment in practical application is small, and the device is only 1m 2 On the left and right sides, the civil engineering cost hardly needs to be invested in the earlier stage of the equipment, so that the method has certain advantages in engineering application.
Example 2: a vortex street tube 22 is installed in the high-pressure gas dissolving tank 10.
The cavitation phenomenon is a process in which when the local pressure in a liquid is reduced, a gas in the liquid or on a solid-liquid interface forms a cavity (cavitation bubble), develops and becomes large, and finally collapses. The vortex street cavitation is characterized in that when fluid bypasses a certain object, two sides of the object periodically fall off double linear vortexes which are opposite in rotation direction and regularly arranged, and the fluid generates cavitation effect in the linear vortexes, so that micro-nano bubbles are generated.
The vortex street nozzle 22 is formed by connecting two or more vortex street nozzles in series through a pipeline, the vortex street nozzle comprises 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 25, and a partition is arranged in the middle of the gasket 26.
The front view of the vortex street nozzle is in a trapezoidal structure, and a partition is arranged in the middle of the gasket 26, so that gas and liquid are shunted to form a vortex street.
Tap water is primarily filtered by the filter 4, then is injected into the high-pressure dissolved air tank 10 by the plunger pump 6, and airflow is mixed with water flow at the inlet of the high-pressure dissolved air tank 10. The mixed gas-water mixed fluid passes through the vortex street tubes 22 connected in series, and in the vortex street tubes 22, because the gas-water mixed fluid generates vortices under the action of vortex streets, the fluid generates cavitation effect in the vortices, cavities are formed in the liquid flow, and oxygen exists in water in the form of micro bubbles. Meanwhile, the whole process is in a high-pressure state, so that the saturation solubility of oxygen in water is increased, and the oxygen content of high-concentration oxygen-dissolved water is improved.
It will be understood by those skilled in the art that the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, since various modifications, substitutions and improvements within the spirit and scope of the invention are possible and within the scope of the appended claims.
Claims (7)
1. A black and odorous water body treatment device comprises a gas path, a water path and a high-pressure dissolved air tank (10), and is characterized in that a hollow fiber membrane component (8) or a vortex street tube (22) is installed in the high-pressure dissolved air tank (10), and a high-pressure electrode (3) is arranged on a gas path pipeline; the upper part of the high-pressure dissolved air tank (10) is respectively connected with an air path pipeline and a water path 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 diffusion pipe (15).
2. The black and odorous water body treatment device according to claim 1, wherein a water storage tank (12), a filter (4), a flow meter (5) and a plunger pump (6) are arranged on the water 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, wherein the lower portion of the high pressure gas dissolving tank (10) is further connected with an oxygen supply line, and an oxygen supply valve (7) is provided on the oxygen supply line.
4. The black and odorous water body treatment device according to claim 1, wherein the diffusing pipe (15) is a swirl diffusing pipe, and the swirl diffusing pipe is composed of two dissolved oxygen water inlets (16) and one dissolved oxygen water outlet (17); the interior of the rotational flow diffusing pipe is a conical cavity.
5. The black odorous water body treatment device according to claim 1, wherein the vortex street nozzles (22) are formed by connecting two or more vortex street nozzles in series through a pipeline, the vortex street nozzles 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 (25), and a partition is arranged in the middle of the gasket (26).
6. The black odorous water treating device according to claim 1, wherein 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).
7. The black and odorous water body treatment device according to claim 1, characterized in that a float level gauge (9) is provided at the upper part of the high-pressure dissolved air tank (10), and a pressure relief valve (11) is provided at the lower part.
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