CN104445510B - A kind of deflector type controllable is ultrasonic/ultraviolet combined sterilizing reactor - Google Patents

Abstract

The invention provides a baffle type adjustable ultrasonic/ultraviolet combined disinfection reactor, which belongs to the field of sewage and sludge treatment. The device uses the joint action of ultrasonic waves and ultraviolet rays to improve the particle size distribution of particles in sewage through ultrasonic crushing, cavitation and mechanical shearing, and promotes the killing of pathogenic bacteria by ultraviolet rays, thereby improving the efficiency and stability of ultraviolet disinfection. The water flow deflects through each reaction chamber of the reactor, which increases the contact time between the water flow and the disinfectant, forms a multi-stage reaction process, and increases the controllability of the reaction process. This technology can greatly reduce the risk of by-products caused by chemical disinfection. It is especially suitable for the disinfection treatment of small and medium-sized sewage treatment plants. The technical operation is simple, no auxiliary equipment is required, and it is safe and efficient.

Description

A baffle type adjustable ultrasonic/ultraviolet combined disinfection reactor

technical field

The invention relates to the technical field of sewage and sludge treatment, in particular to a baffle type adjustable ultrasonic/ultraviolet combined disinfection reactor.

Background technique

Due to its high efficiency, no disinfection by-products, and no secondary pollution to water, ultraviolet disinfection technology has developed rapidly in recent years and has been more and more used. The principle is to use ultraviolet rays (UVC) of appropriate wavelengths to destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in the cells of microorganisms, causing growth cell death and (or) regenerative cell death, to achieve sterilization Effect. The main factors affecting the disinfection effect of ultraviolet rays are water quality conditions and microbial types. In addition, the design and operation of the ultraviolet system will also affect the disinfection effect. After the sewage has undergone primary and secondary treatment in the municipal sewage plant, most microorganisms in the water exist in two states: dispersed independent individuals (not combined with other substances) or wrapped in large particles (with other substances such as bacteria or cell debris); In addition to being directly absorbed and inactivated by pathogenic bacteria for ultraviolet disinfection, the part wrapped or blocked by the bacterial gelatin reflects ultraviolet light and does not achieve the purpose of sterilization. Therefore, the suspended solids concentration (SS), particle size distribution and turbidity of water are the main water quality factors affecting the effect of ultraviolet disinfection. In most cases, increasing the UV dose can improve the inactivation effect, and the UV dose can be increased by increasing the intensity of the UV lamp or prolonging the UV exposure time. However, this also increases the investment and operation cost of ultraviolet disinfection, which does not meet the economical requirements of the disinfection process. In addition to the water quality conditions, the scaling of the UV lamp and the attenuation of the life of the UV lamp lead to the weakening of the UV intensity, which will also affect the effect of the UV disinfection operation.

After searching the existing technology, it is found that the new technology for sewage disinfection in order to improve the efficiency and reduce the by-products has been studied in recent years, but the application is still lacking. Ultrasound has a cavitation effect. The cavitation process releases huge energy with the formation, growth and instantaneous collapse of cavitation bubbles. At this time, the highly oxidizing and highly active free radicals (OH) are produced for continuous cleaning. The water-air separation of cavitation bubbles can strengthen the chemical process and improve the environment where the reaction occurs; at the same time, cavitation can promote water turbulence and liquid microcirculation to enhance the mass transfer effect of the liquid, and the thermal effect, cavitation effect and On the one hand, the mechanical shearing force can break the large-grain micelle into a small granule, thereby exposing the bacteria; on the other hand, the ultrasonic wavelength can damage the cell membrane to a certain extent. In addition, the ultrasonic has a mechanical shearing effect to cause a certain degree of physical changes in the liquid, and the ultrasonic can also play a cleaning role in the system.

In order to solve the problems existing in the ultraviolet disinfection process, the present invention provides a baffle type adjustable ultrasonic/ultraviolet combined disinfection reactor in combination with the characteristics of ultrasonic waves and the advantages of ultraviolet disinfection.

Contents of the invention

The technical problem to be solved by the present invention is to provide a baffle type controllable ultrasonic/ultraviolet combined disinfection reactor to solve the existing shortcomings of only relying on ultraviolet disinfection at present.

The disinfection reactor includes a flow meter, a valve, a disinfection reaction tank, a diversion partition, a water inlet compartment partition, an ultrasonic transducer, an ultraviolet lamp, a water outlet, a cleaning mud outlet, an ultrasonic generator and an ultraviolet lamp control unit. panel;

Among them, the flow meter is connected to the valve, the diversion partition and the water inlet compartment partition are arranged in the disinfection reaction tank, the ultrasonic transducer is pasted on the bottom of the disinfection reaction tank, and the ultraviolet lamp is arranged in the compartment separated by the diversion partition. In the disinfection reaction tank, the ultrasonic transducer and the ultraviolet lamp are controlled by the ultrasonic generator and the ultraviolet lamp control panel.

The disinfection reaction tank is made of SUS304 stainless steel; there are two diversion partitions, which are placed vertically in the disinfection reaction tank, and the disinfection reaction tank is divided into three grids on average. Three grids, the first grid is the ultrasonic pretreatment area, the water inlet partition partition is placed in the middle of the first grid, and the pretreatment area is divided into two parts evenly, which can change the direction of water flow and improve the particle size distribution in the water. The first The pipe on the upper part of the grid is connected with the valve, the bottom of the first grid is provided with a cleaning and mud discharge port, and the upper part of the third grid is provided with an overflow outlet. The diversion partition and the partition of the water inlet compartment are provided with water holes at different positions to make the sewage form a baffle flow state in the disinfection reaction tank, and the water flow cross-sectional area of the water hole is the same as that of the water inlet partition.

The ultrasonic transducer is evenly pasted on the bottom of the disinfection reaction tank, and there is no gap in the pasting process, so that the ultrasonic transducer and the disinfection reaction tank form a whole.

The ultraviolet lamp tubes are arranged at five points in a plum blossom shape in the second and third compartments of the reaction tank divided into three compartments by the diversion partition. The lamp tubes are placed vertically, and the position of the lamp tubes is controlled by the bottom and top of the fixed frame. The liquid level control just submerges the lamp, and the lamp holder is above the liquid level.

The ultrasonic generator and the ultraviolet lamp control panel can individually control each device of the ultrasonic transducer and the ultraviolet lamp, and the ultrasonic generator can adjust the ultrasonic power from 0 to 100%.

The beneficial effects of above-mentioned technical scheme of the present invention are as follows:

(1) Set the pretreatment area, that is, the first compartment of the disinfection reaction tank. The pretreatment area can realize the pretreatment effect on larger particles in the sewage (when there is ultrasonic wave, the large particles are broken; when there is no ultrasonic wave, part of the particle matter is precipitated); on the other hand, it can reduce the impact load of the change of water quantity and quality on the subsequent disinfection reaction .

(2) The disinfection reaction zone is highly controllable. Multiple sets of ultrasonic transducers and multiple sets of ultraviolet lamps are evenly arranged in the disinfection reaction area of the device. The transducers and ultraviolet lamps can be controlled separately, and the irradiation dose of ultraviolet lamps and ultrasonic sound energy density can be increased or decreased according to different water quality conditions. .

(3) The diversion baffle and water inlet compartment are set up, which reasonably changes the flow direction of the sewage and divides it into two parts, the downstream and the upstream, which can effectively prevent the phenomenon of short flow when the flow rate increases, and improve the disinfection treatment Effect, in addition, the direction of the water flow is arranged in parallel with the ultraviolet lamp tube, which can reduce the impact of the water flow on the ultraviolet lamp tube and delay the fouling phenomenon of the ultraviolet lamp tube.

Description of drawings

Fig. 1 is the front view of the structural schematic diagram of the baffle type adjustable ultrasonic/ultraviolet combined disinfection reactor of the present invention;

Fig. 2 is the top view of the baffle type adjustable ultrasonic/ultraviolet combined disinfection reactor of the present invention;

Fig. 3 is a schematic cross-sectional view of the baffle type adjustable ultrasonic/ultraviolet combined disinfection reactor of the present invention.

in:

1-flow meter; 2-valve; 3-disinfection reaction tank; 4-diversion partition; 5-diversion compartment partition; 6-ultrasonic transducer; 7-ultraviolet lamp; -cleaning the mud outlet; 10-ultrasonic generator and ultraviolet lamp control panel.

detailed description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

The present invention aims at the problem that the existing ultraviolet disinfection can not deal with the large-particle bacterial mass in water well, and provides a baffle type adjustable ultrasonic/ultraviolet combined disinfection reactor.

As shown in Figures 1 and 2, the water inlet is controlled jointly by the flow meter 1 and the valve 2 of the device, and the device arranges two diversion partitions 4 evenly on the length of the disinfection reaction tank 3 to divide the disinfection reaction tank 3 evenly. For three grids. The water flow deflects through the reactor, and is recorded as the first, second, and third compartments according to the direction of the water flow. The bottoms of the first, second, and third compartments are equipped with low-frequency ultrasonic transducers 6, and the second and third compartments are vertically installed with detachable The ultraviolet lamp tube 7 is vertically provided with a water-inlet partition partition 5 in the middle of the first grid. Considering the superelevation of the reaction zone and the structure of the ultrasonic transducer and generator cavity, the overall device is made of SUS304 stainless steel. The low-frequency ultrasonic transducer 6 is evenly pasted on the bottom of the disinfection reaction tank 3, the power can be adjusted between 0% and 100%, and it is driven by the power supply of the ultrasonic generator. The ultraviolet lamp tubes 7 are low-voltage low-intensity ultraviolet lamp tubes, which are evenly arranged and installed in the second and third grid reaction zones. Each ultraviolet lamp tube 7 can be individually controlled on and off, and adjusted according to dosage needs.

As shown in Figure 3, the diversion partition 4 and the water inlet partition partition 5 are respectively provided with water holes at different positions, so that the sewage forms a baffle flow state in the disinfection reaction tank 3, and the water holes and the water inlet partition The cross-sectional area of the flow is the same.

The sewage first enters the first grid of the disinfection reaction tank 3 from the water inlet pipe on the upper part of the device, and a partition board 5 for the water inlet partition is set in the first grid, and its main functions are two: 1. When there is no ultrasonic wave, the inlet water is subjected to the inlet water partition The resistance of the partition plate 5 reduces the flow rate, and the baffle method is used to improve the hydraulic conditions, and the large particles in the water (such as sand, sludge, etc.) are precipitated to ensure a good ultraviolet penetration rate; when there is ultrasound, it is used as a pretreatment to improve The condition of water quality particles can promote the subsequent ultraviolet disinfection process; 2. Adjust the flow rate when the water volume changes to reduce the hydraulic impact load in the subsequent reaction zone. The water flow rate in this cell is controlled within 0.17m/s, and the hydraulic retention time is > 1.6min. At the same time, a cleaning mud outlet 9 is provided at the bottom of the pretreatment area, which can be used for emptying the device and cleaning deposited sludge during inspection and maintenance, and is controlled by a valve. Then enter the second grid in turn, process in the third grid, and finally discharge.

After being treated by the secondary treatment process of the municipal sewage plant, the effluent is controlled by the flow meter 1 and the water volume regulating valve 2, and then enters the disinfection reaction tank 3. In the pretreatment area, the sewage passes through the water inlet partition partition 5 and the diversion partition 4 to go down first. Then go up, make the large particle sludge settle in the device, increase the penetration rate of ultraviolet rays in the water body, and improve the effect of subsequent ultraviolet disinfection. Then the sewage overflows through the diversion partition and enters the disinfection reaction area. In the disinfection main reaction area, the ultrasonic transducer 6 and the ultraviolet lamp 7 work together, and the ultraviolet lamp 7 irradiates and disinfects it. The particle size of bacteria micelles can increase the penetration rate of ultraviolet rays, delay the formation of fouling of ultraviolet lamps, accelerate the agitation of sewage, and reduce the appearance of dead zones in water flow. After the microorganisms in the sewage are sterilized, the water is discharged from the water outlet 8, and when the sediment at the bottom of the device or the device is emptied, it can be discharged from the cleaning sewage outlet 9, and the ultrasonic transducer 6 and the ultraviolet lamp 7 are uniformly controlled by the ultrasonic generator and the ultraviolet lamp Panel 9 controls. In addition, the external power control box can adjust the ultraviolet radiation dose and ultrasonic power, thereby improving its adaptability to different types of sewage.

The actual operation shows that the total size of the device is 600×500×1200mm (L×B×H), in which the effective size of the disinfection reaction tank 3 is 600×200×800mm (L×B×H), and the total effective volume is 96L. The diversion partitions 4 are arranged every 200mm along the length of the reactor, and the reactor is divided into three cells on average. The size of a single cell reaction tank is 200×200×800mm (L×B×H), and the volume of a single cell is 32L. In the first cell, the partition plate 5 for the water inlet compartment is arranged, and the first cell is divided into two parts on average. Ten low-frequency ultrasonic transducers 6 are evenly installed at the bottom of the reactor, and ten 80W low-voltage ultraviolet lamps 7 are evenly installed in the second and third compartments. When the influent flow rate is 20L/min, the second and third 28kHz ultrasonic transducers 6 are fully turned on, each 80W low-pressure ultraviolet lamp 7 is turned on, and the total input power is 260W, the concentration of fecal coliform bacteria in the effluent water quality can be the highest. It can reach 93～673CFU/L, and all of them meet the requirement of 1000CFU/L stipulated in China's urban sewage treatment plant discharge standard, with an average logarithmic removal rate of 4.0log ₁₀ . Under the same energy consumption, ultraviolet rays are used alone for disinfection. The concentration of fecal coliform bacteria in the effluent water quality is 837-4770CFU/L. The effluent water quality fluctuates in a wide range and cannot meet the standard stably. It can be seen that the baffle type adjustable ultrasonic/ultraviolet combined disinfection reactor has a good disinfection effect.

The above is a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (1)

1. a deflector type controllable ultrasonic/ultraviolet combined sterilizing reactor, it is characterised in that: this disinfection reactions Device includes effusion meter (1), valve (2), disinfection reactions groove (3), diaphragm (4), water inlet septal area dividing plate (5), surpasses Acoustic wave transducer (6), ultraviolet lamp tube (7), outlet (8), cleaning mud discharging mouth (9) and supersonic generator and ultraviolet Lamp control panel (10)；

Wherein, effusion meter (1) is connected with valve (2), and diaphragm (4) and water inlet septal area dividing plate (5) are arranged in sterilization In reactive tank (3), ultrasonic transducer (6) is pasted onto disinfection reactions groove (3) bottom, ultraviolet lamp tube (7) be arranged in by In disinfection reactions groove (3) after diaphragm (4) separation, ultrasonic transducer (6) and ultraviolet lamp tube (7) are by ultrasound wave Generator and uviol lamp control panel (10) control；

Described disinfection reactions groove (3) uses SUS304 stainless steel to make；

Described diaphragm (4) has two pieces, is vertically placed in disinfection reactions groove (3), and disinfection reactions groove (3) is average It is divided into three lattice, is respectively the first lattice, the second lattice and the 3rd lattice along water (flow) direction；First lattice are ultrasonic pretreatment District, water inlet septal area dividing plate (5) is placed in the middle of these first lattice, pretreating zone is equally divided into two parts, the first lattice Upper pipe is connected with valve (2), arranges cleaning mud discharging mouth (9) bottom the first lattice, and the 3rd lattice top arranges overflow Outlet (8)；

Described diaphragm (4) and water inlet septal area dividing plate (5) arrange water hole at diverse location respectively, make sewage Forming baffling fluidised form in disinfection reactions groove (3), water hole is identical with the water flow section area of water inlet septal area；

Described ultrasonic transducer (6) is pasted onto disinfection reactions groove (3) bottom uniformly, and taping process does not exists Gap；

Described ultraviolet lamp tube (7) uses at quincunx 5, and to be arranged in by diaphragm (4) even partition be that three lattice are anti- Answering the second lattice and the 3rd lattice of groove, fluorescent tube is disposed vertically, and bottom and top use fixing frame plate to control the position of fluorescent tube Putting, Liquid level just floods fluorescent tube, and lamp socket is more than liquid level；

Described supersonic generator and uviol lamp control panel (10) can individually control ultrasonic transducer (6) With each equipment of ultraviolet lamp tube (7), supersonic generator can be from regulating ultrasound wave between 0～100% simultaneously Power.