CN216155537U

CN216155537U - But continuous operation photocatalysis sewage treatment plant

Info

Publication number: CN216155537U
Application number: CN202122200887.7U
Authority: CN
Inventors: 李进; 李光; 陈卓妘; 柳晓; 涂晓波
Original assignee: Wuhan Weimeng Environmental Technology Co ltd
Current assignee: Wuhan Weimeng Environmental Technology Co ltd
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2022-04-01
Anticipated expiration: 2031-09-13

Abstract

The utility model relates to a photocatalytic sewage treatment device capable of continuously operating, and belongs to the field of water treatment. Including reaction tank and power, install many baffling baffles in the reaction tank, install the fluorescent tube support between the baffling baffle, the fluorescent tube that has arranged many ultraviolet rays on the fluorescent tube support, the fluorescent tube is connected with outside power, there is the water seal groove on the outer wall of reaction tank upper portion, the water seal groove cooperatees with the top closing cap and plays sealed effect, the front portion and the advancing water piping connection of reaction tank, the rear portion and the play water piping connection of reaction tank, the inlet tube passes through the lateral line and links to each other with measuring pump and sodium hypochlorite storage tank in proper order. The device can increase or decrease the lamp tubes according to the needs. The top is sealed by adopting a water seal tank, so that gas can be effectively prevented from overflowing. The tail end is provided with an online residual chlorine device to monitor the residual chlorine content of the effluent in real time, so that the problem of secondary pollution is effectively reduced.

Description

But continuous operation photocatalysis sewage treatment plant

Technical Field

The utility model relates to a photocatalytic sewage treatment device capable of continuously operating, and belongs to the field of water treatment.

Background

The ammonia nitrogen contained in the sewage refers to the combined nitrogen existing in the form of ammonia or ammonium ions, namely the nitrogen existing in the form of free ammonia (NH3) and ammonium ions (NH4+) in the water. Ammonia nitrogen is one of indexes for controlling the total emission amount of 'twelve five' national pollutants, and is a basic project for monitoring water environment. The sources of ammonia nitrogen in water are mainly decomposition products of nitrogenous organic matters in domestic sewage under the action of microorganisms, industrial wastewater such as coking and synthetic ammonia and farmland drainage. The main harm effect of ammonia nitrogen on aquatic organisms is free ammonia, the toxicity of the free ammonia is dozens of times higher than that of ammonium salt, and the free ammonia increases with the increase of alkalinity. The toxicity of ammonia nitrogen has a close relationship with the pH value and the water temperature of the pond water, and under the general condition, the higher the pH value and the water temperature is, the stronger the toxicity is, and the harm to fish is similar to that of nitrite. The harm of ammonia nitrogen to aquatic life is divided into acute and chronic. The harm of chronic ammonia nitrogen poisoning is as follows: decreased feeding, slower growth, tissue damage, and reduced oxygen transport between tissues. The fish is sensitive to ammonia nitrogen in water, and when the ammonia nitrogen content is high, the fish can die. The acute ammonia nitrogen poisoning hazard is as follows: the water organisms appear to be excited, lose balance in water, twitch, and even die in severe cases. The ammonia nitrogen in the water can be converted into nitrite under certain conditions, and if the water is drunk for a long time, the nitrite in the water is combined with protein to form nitrosamine, which is a strong carcinogen and extremely unfavorable for the human health.

Although there are many methods for removing ammonia effectively, such as physical methods like reverse osmosis, distillation, soil irrigation; the chemical method comprises an ion exchange method, ammonia stripping, a chemical precipitation method, breakpoint chlorination, electrodialysis, electrochemical treatment and catalytic cracking; biological methods include nitrification and algae cultivation. But the treatment method applied to industrial wastewater must have the advantages of convenient application, stable treatment performance, suitability for wastewater quality, economy and the like, so the current technology with better ammonia nitrogen treatment practicability is as follows: biological denitrification; ammonia stripping and steam stripping; a breakpoint chlorination process; and (4) ion exchange.

A biological denitrification method: biological denitrification is an A/O denitrification process, ammonia nitrogen is nitrified into nitrate nitrogen in an aerobic stage, and the nitrate nitrogen is denitrified into nitrogen in an anaerobic stage, so that the denitrification process is completed. The biological denitrification has certain requirements in the operation process, needs to control conditions such as pH, stability, dissolved oxygen, C/N ratio and the like, and is not suitable for removing ammonia nitrogen by a biological method under the condition of no pretreatment on waste water with biological toxicity or high salinity and high chlorine.

Ammonia stripping and steam stripping: the ammonia stripping and steam stripping process has the advantages of simple flow, stable treatment effect and the like, but has the defects of higher operation cost and easy scale generation, and the scale generation seriously influences the subsequent stable operation in large-scale ammonia stripping and steam stripping towers.

Ion exchange method: the ion exchange method has the advantages of investment saving, simple process and convenient operation, but for high-concentration ammonia nitrogen wastewater, the resin can be frequently regenerated to cause operation difficulty, and the regenerated liquid is still the high-concentration ammonia nitrogen wastewater and needs to be reprocessed to increase the processing difficulty.

When treating wastewater containing ammonia nitrogen, the simplest method is a breakpoint chlorination method, namely, excessive sodium hypochlorite is added into the wastewater, and the sodium hypochlorite and the ammonia nitrogen undergo a series of reactions to finally change the ammonia nitrogen into nitrogen so as to achieve the purpose of removing the ammonia nitrogen. The reaction process of breakpoint chlorination is as follows:

NaClO+H₂O→NaOH+HClO

NH⁺ ₄+HClO→NH₂Cl+H⁺+H₂O

NH₂Cl+HClO→NHCl₂+H₂O

2NH₂Cl+HClO→N₂↑+3H⁺+3Cl^-+H₂O

however, in the actual process, the reaction efficiency is low by simply adding sodium hypochlorite, and the problem of residual chlorine is also caused.

The current environment protection situation is still severe, the environmental protection requirement of water source sensitive places is higher and higher, and a plurality of government and enterprise related waste water face the problem of upgrading and transformation, especially the emission requirement of COD is higher and higher.

At present, relevant technologies such as advanced oxidation methods (including ozone catalytic oxidation, fenton reagent method, electrochemical oxidation), activated carbon adsorption method and ion exchange method can be used for realizing COD standard-lifting discharge. Although the methods can realize the standard-lifting discharge of COD, the methods have some defects, such as short service life of the catalyst of the ozone catalytic oxidation method; the fenton reagent method can generate sludge and bring new problems; the investment cost of the electrochemical oxidation method is relatively high, a large amount of solid waste can be generated by the activated carbon adsorption method, and the operation cost is high; the ion exchange method is limited by the concentration of salt contained in the wastewater, and when the concentration of salt is too high, the treatment effect is greatly reduced.

Before the utility model, related technical patents of photocatalytic wastewater treatment exist, for example, the patent number is CN201220501206.9, and the device effectively removes ammonia nitrogen and pollutants in wastewater by utilizing the synergistic effect of ultraviolet light and sodium hypochlorite. However, the utility model has several disadvantages. For example: 1, the device is intermittently fed, so that a single set of equipment cannot continuously run, and the treatment capacity is low; 2, the sealing mode of the device is not mentioned, because the sealing performance of the device for the synergistic reaction of ultraviolet illumination and sodium hypochlorite is related to whether the device can successfully and stably operate; 3, the device does not monitor the residual chlorine of the tail end effluent in real time, and has the hidden danger of excessive residual chlorine; 4, the device does not refer to the selection of an anticorrosive material, and for a system with ultraviolet illumination and sodium hypochlorite existing at the same time, the selection quality of the anticorrosive material can determine the service life of the device.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the device provided by the utility model aims to provide a photocatalytic sewage treatment device capable of continuously operating. By selecting proper illumination intensity and wavelength, the device of the utility model can greatly accelerate the breakpoint reaction efficiency of sodium hypochlorite and ammonia nitrogen. The experimental result shows that the reaction speed can be improved by more than 20 times under the action of the photocatalytic reactor, and simultaneously, the residual chlorine is effectively decomposed, so that the problem of residual chlorine is solved.

The utility model provides a but continuous operation photocatalysis sewage treatment plant, includes reaction tank and power, install many baffling baffles in the reaction tank, install the fluorescent tube support between the baffling baffle, the fluorescent tube that has many sent out ultraviolet light has been arranged on the fluorescent tube support, the fluorescent tube is connected with outside power, there is the water seal groove on the outer wall of reaction tank upper portion, the water seal groove cooperatees with the top closing cap and plays sealed effect, the front portion and the advance water piping connection of reaction tank, the rear portion and the play water piping connection of reaction tank, the inlet tube links to each other with measuring pump and sodium hypochlorite storage tank in proper order through the lateral line.

The water inlet pipe main line is used for being communicated with the wastewater. And a flowmeter is arranged on the water inlet pipe.

Further, the reaction tank and the top sealing cover are made of titanium materials and used for preventing corrosion of ultraviolet light and sodium hypochlorite.

When the utility model is used, a large amount of active atomic oxygen and a small amount of hydroxyl free radicals can be generated under the action of ultraviolet illumination and sodium hypochlorite, the reaction process is shown in the following reaction formulas (1) to (3), the active atomic oxygen and the small amount of hydroxyl free radicals have strong oxidizability, and organic matters in wastewater can be removed, so that COD and BOD in the wastewater are reduced, and the requirement of upgrading and reconstruction of a sewage plant is met.

NaClO+H₂O→NaCl+[O]+[·OH] (1)

R-H+[·OH]→P----→CO₂+H₂O (2)

R-H+[O]→P----→CO₂+H₂O (3)

R-H- - -organic matter in the above formula; p- - -organic decomposition products.

The interior of the reaction tank is roughly divided into three areas by baffle plates, the areas distributed by the baffle plates are provided with lamp tubes emitting ultraviolet light and are called photoreaction areas, the area in front of the photoreaction area is a water inlet area, and the area behind the photoreaction area is a water outlet area.

The utility model has the function of continuous water inlet and outlet, and the light reaction zone utilizes the baffling partition plates to carry out step-by-step reaction. The top of the device adopts a water seal sealing mode, and after water is injected into a water seal groove (as shown in figure 1), a top sealing cover is directly added to ensure that the top sealing cover is completely covered by the water, thereby achieving the sealing effect. The tail end of the device is additionally provided with the residual chlorine on-line detector, so that the concentration of the residual chlorine in the effluent can be monitored in real time, and the final effluent effect is ensured. The reaction tank is made of titanium materials, so that the problems of corrosion resistance and ultraviolet resistance are effectively solved. In addition, the photoreaction unit of the device can be flexibly increased and decreased within a certain range, so that the treatment requirements of different water quantities are met.

Drawings

FIG. 1 is a schematic view showing a structure of a photocatalytic sewage treatment apparatus capable of continuously operating.

FIG. 2 is a partial schematic view of the distribution of lamps.

Wherein, the sodium hypochlorite medicine storage tank 1, the metering pump 2, the flowmeter 3, the water inlet pipe 4, the top sealing cover 5, the water seal tank 6, the lamp tube bracket 7, the lamp tube 8, the quartz sleeve 9, the power supply 10, the water inlet area 11, the photoreaction area 12, the water outlet area 13, the emptying valve 14, the water outlet pipe 15, the residual chlorine on-line detection equipment 16, the baffling partition 17 and the reaction tank 18.

Detailed Description

Referring to fig. 1, the apparatus of the present invention comprises.

The utility model provides a but continuous operation photocatalysis sewage treatment plant, includes reaction tank 18 and power 10, install many baffling baffles 17 in the reaction tank 18, install fluorescent tube support 7 between the baffling baffle 17, many fluorescent tubes 8 of giving out ultraviolet light have been arranged on the fluorescent tube support 7, fluorescent tube 8 is connected with outside power 10, there is water seal tank 6 on the outer wall of reaction tank 18 upper portion, water seal tank 6 cooperatees with top closing cap 5 and plays sealed effect, the front portion and the inlet tube 4 of reaction tank 18 are connected, the rear portion and the outlet pipe 15 of reaction tank 18 are connected, inlet tube 4 links to each other with measuring pump 2 and sodium hypochlorite storage tank 1 in proper order through the lateral line.

The 4 mainlines of the water inlet pipe are communicated with a waste water storage tank. A flowmeter 3 is mounted on the water inlet pipe 4.

Further, the reaction tank 18 and the top cover 5 are made of titanium material for preventing corrosion of ultraviolet light and sodium hypochlorite.

The quartz sleeve 9 is sleeved outside the lamp tube 8, so that the lamp tube 8 is protected, and the service life is prolonged.

Further, the water outlet pipe 15 is provided with an on-line residual chlorine monitoring device 16.

An emptying valve 14 is also arranged at the bottom of the reaction tank 18, so that the equipment is convenient to overhaul.

The interior of the reaction tank is roughly divided into three areas by baffle plates 17, the areas where the baffle plates are distributed are provided with tubes which emit ultraviolet light and are called as photoreaction areas 12, the area in front of the photoreaction area 12 is a water inlet area 11, and the area behind the photoreaction area 12 is a water outlet area 13.

Sodium hypochlorite medicine storage tank 1 is placed in the one side of intaking, and the upper end is equipped with control dosing's measuring pump 2, and pending sewage is connected to inlet tube 4, through flowmeter 3 control inflow. The wastewater overflows into a photoreaction zone 12 through a water inlet zone 11, the lamps 8 are uniformly arranged in the photoreaction zone, a quartz sleeve 9 is sleeved outside each lamp, and the quartz sleeve plays a role in protecting the lamps. Wastewater entering the photoreaction zone reacts step by step through a baffling partition plate 17 (as shown in figure 2), uniform reaction can be realized while continuous water feeding is carried out, the wastewater overflows into a water outlet zone 13 after the reaction is finished, the wastewater is discharged through a water outlet pipe 15, and a final water outlet is provided with residual chlorine on-line detection equipment for monitoring the final effluent residual chlorine concentration in real time. The device is provided with an emptying valve 14, so that the equipment is convenient to overhaul. The device adopts a water seal form for sealing, and the sealing effect is good.

The first embodiment is as follows:

after the wastewater of a certain explosive enterprise is subjected to physicochemical and biochemical processes, the ammonia nitrogen effluent does not reach the standard, the ammonia nitrogen of the effluent fluctuates between 90 and 100mg/L, a large amount of sodium hypochlorite is directly added, the ammonia nitrogen of the effluent is 30 to 40mg/L, the ammonia nitrogen of the effluent still does not reach the standard, and a large amount of sodium hypochlorite remains. After the treatment by the process flow disclosed by the utility model, the ammonia nitrogen can be stably reduced to be within 10mg/L, the COD (chemical oxygen demand) is also reduced to be about 40mg/L from 70-80mg/L, and the treatment results are shown in the following table 1:

TABLE 1

Example two:

the method for removing ammonia nitrogen from the metal smelting wastewater adopts a method of directly adding sodium hypochlorite, the ammonia nitrogen of raw water is 150mg/L, the ammonia nitrogen is required to be reduced to below 10mg/L, after a large amount of sodium hypochlorite is added twice, the ammonia nitrogen of effluent is about 10mg/L, and the effluent cannot be stably discharged up to the standard, after the treatment by adopting the process flow disclosed by the utility model, the adding amount of the sodium hypochlorite is reduced by half, and the ammonia nitrogen of the effluent can be stably controlled to be below 3 mg/L. In addition, COD can be reduced from about 100mg/L to within 30 mg/L. The results of the experiment are shown in table 2 below:

TABLE 2

Claims

1. The utility model provides a but continuous operation photocatalysis sewage treatment plant, includes reaction tank (18) and power (10), its characterized in that, install many baffling baffle (17) in reaction tank (18), install fluorescent tube support (7) between baffling baffle (17), lamp tube support (7) are last to have arranged many fluorescent tubes (8) of giving out ultraviolet light, fluorescent tube (8) are connected with outside power (10), there are water-sealed groove (6) on reaction tank (18) upper portion outer wall, water-sealed groove (6) cooperate with top closing cap (5) and play sealed effect, the front portion and inlet tube (4) of reaction tank (18) are connected, the rear portion and outlet pipe (15) of reaction tank (18) are connected, inlet tube (4) link to each other with medicine measuring pump (2) and sodium hypochlorite storage tank (1) in proper order through the lateral line.

2. The continuously operable photocatalytic sewage treatment apparatus according to claim 1, wherein the main line of the water inlet pipe (4) is adapted to communicate with a waste water storage tank, and a flow meter (3) is installed on the water inlet pipe (4).

3. The continuously operable photocatalytic sewage treatment apparatus according to claim 1 or 2, characterized in that the reaction tank (18) and the top cover (5) are made of titanium material.

4. A continuously operable photocatalytic sewage treatment apparatus according to claim 1 or 2, characterized in that the lamp tube (8) is covered with a quartz sleeve (9).

5. The continuously operable photocatalytic sewage treatment apparatus according to claim 1 or 2, wherein the water outlet pipe (15) is provided with an on-line residual chlorine monitoring device (16).

6. The continuously operable photocatalytic sewage treatment apparatus according to claim 1 or 2, characterized in that the bottom of the reaction tank (18) is further provided with an evacuation valve (14).