CN114644393A - A kind of sewage COD purification device and purification method - Google Patents

Abstract

The invention provides a sewage COD purification device and a purification method. The sewage COD purification device includes a tank body and a fan, and an aeration device, a first sieve plate and a second sieve plate are arranged in the tank body. The aeration device connected with the fan, the first sieve plate and the second sieve plate are located above the aeration device, and biological fillers are arranged between the first sieve plate and the second sieve plate, wherein, The first sieve plate is fixedly arranged in the tank body, the second sieve plate is movably arranged above the first sieve plate, and the second sieve plate is suitable for reciprocating movement in the up-down direction to squeeze the Biofiller. The biological filler of the invention can be fully mixed with the sewage, the contact area between the sewage and the biological filler is increased, the sewage treatment efficiency is improved, and the biological filler collides and shears in the sewage, thereby improving the utilization rate of oxygen; and can pass the second sieve. The plate moves up and down to squeeze the biological filler to remove the impurities on the biological filler to ensure a relatively stable treatment effect.

Description

A kind of sewage COD purification device and purification method

technical field

The invention relates to the technical field of sewage treatment, in particular to a sewage COD purification device and a purification method.

Background technique

COD (Chemical Oxygen Demand) is chemical oxygen demand, which is a chemical method to measure the amount of reducing substances that need to be oxidized in water samples. COD in sewage is an important and fast-determining organic pollution parameter, and the COD of treated sewage must meet the discharge standard. In the prior art, in order to reduce the COD in the sewage, the activated sludge method is generally used for treatment, and the organic matter in the sewage is degraded by the microorganisms in the activated sludge, but the treatment efficiency of the activated sludge method is low, the treatment time is long, and the activity Sludge is easily affected by sewage impurities and sewage scouring, which leads to the problem of sludge expansion and loss, thus affecting the treatment effect of sewage.

SUMMARY OF THE INVENTION

The problem solved by the present invention is that the sewage treatment efficiency in the prior art is low, and there are problems of sludge expansion and loss.

In order to solve at least one aspect of the above problems, the present invention provides a sewage COD purification device, including a tank body and a fan, and an aeration device, a first sieve plate and a second sieve plate are arranged in the tank body. The device is connected with the fan, the first sieve plate and the second sieve plate are located above the aeration device, and biological fillers are arranged between the first sieve plate and the second sieve plate, wherein , the first sieve plate is fixedly arranged in the tank body, the second sieve plate is movably arranged above the first sieve plate, and the second sieve plate is suitable for reciprocating movement in the up and down direction to squeeze the biological fillers.

Preferably, a plurality of screws are vertically movable on the first screen plate, and corresponding screw holes are correspondingly provided on the second screen plate, and the screws pass through the screw holes. , the second screen plate is suitable for moving up and down along the screw.

Preferably, the sewage COD purification device further includes a motor, the motor shaft of the motor is provided with a first gear, the screw is provided with a second gear meshed with the first gear, and the motor is suitable for driving The screw rotates.

Preferably, the tank body is further provided with a mixer, and the mixer is located at the bottom of the tank body.

Preferably, the biological filler is a polyurethane modified biological affinity filler.

Preferably, the filling rate of the biological filler is 5%-88%.

Preferably, the bio-filler is pre-foiled, the inside of the bio-filler is loaded with anaerobic bacteria and/or facultative bacteria, and the outside of the bio-filler is loaded with aerobic bacteria.

Preferably, the fan is a submerged fan.

Preferably, the bottom of the tank body is provided with a mud discharge port, and the mud discharge port is suitable for discharging the sludge generated in the tank body.

In the present invention, the first sieve plate and the second sieve plate are arranged in the tank body, and the biological filler is arranged between the first sieve plate and the second sieve plate. The density of the biological filler is close to that of sewage. When the aeration device aerates into the tank body At the same time, the biological filler can be fully mixed with the sewage, which increases the contact area between the sewage and the biological filler, and improves the sewage treatment efficiency, and the biological filler collides and shears in the sewage, making the bubbles in the tank smaller and improving the utilization of oxygen. In addition, the first sieve plate can prevent the biological filler from sinking to the bottom of the tank, ensure the full contact between the biological filler and the sewage, and also avoid the mixing of the biological filler and the sludge at the bottom of the tank to affect the microbial activity inside the filler, and can pass the second sieve. The plate moves up and down, which can squeeze the biological filler to avoid excessive growth of bacteria inside the biological filler, or adhesion of external impurities, resulting in too much sludge on the biological filler, affecting the sewage treatment effect, and because the bacteria of the biological filler is attached to the filler. On the carrier, it is not easy to be washed by sewage, which leads to the loss of bacteria, and the treatment effect is relatively stable.

Another object of the present invention is to provide a sewage COD purification method, which adopts the above-mentioned sewage COD purification device to purify, comprising the following steps:

Step S1, mixing the sewage to be treated and the activated sludge containing COD degrading bacteria to form a mixed solution, passing the mixed solution into the sewage COD purification device, and putting it into biological filler, and using an aeration device for aeration, Suffocating for 8-24h to make the biological filler fully contact with the activated sludge, then discharge the mixed solution, repeat 2-3 times, and then use continuous water inlet, continuous water outlet and continuous aeration to the biological filler. The microorganisms on it are domesticated and run continuously for 8-12 days. When a biofilm grows on the biological filler, it means that the film is successfully formed;

Step S2, after the biological filler is successfully filmed, the sewage is passed into the sewage COD purification device, the dissolved oxygen concentration is controlled to be 5-12 mg/L, the hydraulic retention time is 0.5-5 h, and the process is continuously stirred. Complete sewage COD purification treatment.

The present invention purifies COD in sewage through the above-mentioned sewage COD purification device, and pre-films the biological filler. The biological filler after pre-filming contains a large number of active microorganisms and can be fully contacted with sewage. In the process of sewage treatment, purification is provided. The parameters are that the dissolved oxygen content is 5-12mg/L, and the hydraulic retention time is 0.5-5h, which can ensure the effect of sewage treatment, and the treatment time is short.

Description of drawings

Fig. 1 is the sectional view of sewage COD purification device in the embodiment of the present invention;

Fig. 2 is the enlarged view of A area in Fig. 1;

Fig. 3 is the top view of the sewage COD purification device in the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an aeration device in an embodiment of the present invention.

Description of reference numbers:

1-tank; 11-aeration device; 111-aeration pipe; 1111-aeration plate; 12-first sieve plate; 121-screw; 1211-second gear; 13-second sieve plate; 14-biological Filling; 15- mixer; 16- mud outlet; 2- fan; 3- motor; 31- motor shaft; 311- first gear.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, specific embodiments of the present invention will be described in detail below.

It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein.

As shown in FIG. 1 and FIG. 3 , an embodiment of the present invention provides a sewage COD purification device, which includes a tank body 1 and a fan 2, and the tank body 1 is provided with an aeration device 11, a first sieve plate 12 and a second sieve plate 13. The aeration device 11 is connected to the fan 2, the first sieve plate 12 and the second sieve plate 13 are located above the aeration device 11, and a biological filler 14 is arranged between the first sieve plate 12 and the second sieve plate 13, wherein , the first sieve plate 12 is fixedly arranged in the tank 1 , the second sieve plate 13 is movably arranged above the first sieve plate 12 , and the second sieve plate 13 is suitable for reciprocating movement in the up-down direction to squeeze the biological filler 14 .

Specifically, the sewage COD purification device includes a tank body 1 and a fan 2. An aeration device 11 is arranged in the tank body 1. The aeration device 11 is connected to the fan 2. When the fan 2 is working, the aeration device 11 can flow to the tank body 1. Internal aeration increases the dissolved oxygen content in the sewage, and the increase in dissolved oxygen content helps to improve the biological activity of aerobic microorganisms in the device and the ability to degrade organic matter, thereby improving the COD purification efficiency of sewage; There are a first sieve plate 12 and a second sieve plate 13. The first sieve plate 12 and the second sieve plate 13 are provided with evenly distributed sieve holes. The plate 13 is located above the first sieve plate 12 and can move up and down, and a biological filler 14 is arranged between the first sieve plate 12 and the second sieve plate 13, because a small amount of sludge will be generated in the process of sewage COD purification. At the bottom of 1, the first sieve plate 12 can isolate the biological filler 14 from the sludge at the bottom of the tank 1 to prevent the sludge from adhering to the surface of the biological filler 14. In addition, the second sieve plate 13 can move up and down, and can remove the biological material by extrusion. The sludge attached to the surface of the filler 14 regenerates the biological filler and improves the sewage treatment effect. Exemplarily, the fan 2 is a submerged fan, and the submerged fan can be installed underwater without a separate machine room, saving space and cost, and having less noise and low maintenance cost.

By arranging the first sieve plate 12 and the second sieve plate 13 in the tank body 1, and disposing the biological filler 14 between the first sieve plate 12 and the second sieve plate 13, since the density of the biological filler 14 is close to that of sewage, when exposed to When the aeration device 11 aerates into the tank 1, the biological filler 14 can be fully mixed with the sewage, the contact area between the sewage and the biological filler 14 is increased, and the sewage treatment efficiency is improved, and the biological filler 14 collides and shears in the sewage, The air bubbles in the tank body 1 are made smaller, and the utilization rate of oxygen is improved; in addition, the first sieve plate 12 can prevent the biological filler 14 from sinking into the bottom of the tank body 1, ensure that the biological filler 14 is fully contacted with sewage, and avoid the biological filler. 14 is mixed with the sludge at the bottom of the tank body 1 to affect the microbial activity inside the filler, and can move up and down through the second sieve plate 13, which can squeeze the biological filler 14 to avoid excessive growth of bacteria inside the biological filler 14 or adhesion of external impurities, As a result, there is too much sludge on the biological filler 14, which affects the sewage treatment effect. Since the bacterial species of the biological filler 14 is attached to the filler carrier, it is not easy to be washed by the sewage, resulting in the loss of the bacterial body, and the treatment effect is relatively stable.

Wherein, the first sieve plate 12 is vertically movably provided with a plurality of screws 121, the second sieve plate 13 is correspondingly provided with corresponding screw holes, the screws 121 pass through the screw holes on the second sieve plate 13, and when the screw 121 During rotation, the second screen plate 13 is adapted to move up and down along the screw 121 . Specifically, the bottom of the screw 121 is movably connected to the first screen plate 12, the screw 121 can rotate along its axis, the screw 121 passes through the screw holes on the second screen plate 13, and the screw holes and the screw 121 have corresponding thread structures. When the screw 121 rotates, the second screen plate 13 can reciprocate along the vertical direction of the screw 121 . Through the up and down movement of the second sieve plate 13, on the one hand, when the second sieve plate 13 moves downward, the biological filler 14 can be squeezed to remove the sludge and overgrown bacteria on the surface and inside of the biological filler 14, and restore it again. The activity of the biological fillers 14 can regenerate the biological fillers 14 and improve the sewage treatment effect. On the other hand, by adjusting the position of the second sieve plate 13, the filling position of the biological fillers 14 can be limited, so that the biological fillers 14 can fully contact the sewage and improve the sewage treatment efficiency.

Exemplarily, as shown in FIG. 1 and FIG. 2 , the sewage COD purification device further includes a motor 3 , a first gear 311 is provided on the motor shaft 31 of the motor 3 , and a first gear 311 is provided on the screw 121 to mesh with the first gear 311 . The second gear 1211, when the motor 3 is working, the motor 3 is suitable for driving the screw 121 to rotate, wherein the motor shaft 31 may belong to the motor 3 itself, or may be a transmission shaft connected to the motor 3, the first gear 311 and the second gear 311. The gear 1211 is preferably set as a bevel gear, and the transmission between the two bevel gears can be carried out in a mutually perpendicular manner. The screw 121 is driven by the motor 3 to rotate, thereby realizing the up and down movement of the second sieve plate 13 and improving the automation degree of the device.

The tank body 1 is also provided with a mixer 15, and the mixer 15 is obliquely arranged at the bottom of the tank body. The mixer 15 can improve the mixing uniformity of the sewage and the biological filler 14 in the tank 1, and can increase the dissolved oxygen content in the sewage through the flow of sewage, thereby improving the efficiency and effect of sewage treatment. Specifically, the mixers 15 are inclined at the bottom of the tank 1 near the side, and the mixers 15 include at least two. When multiple mixers 15 are inclined at the same time, the sewage in different areas can form convection, so that the tank The sewage in 1 is more evenly mixed, and the stability of sewage treatment is better.

Wherein, the biological filler 14 is a polyurethane modified biological affinity filler. Polyurethane modified bioaffinity filler not only has physical adsorption, but also has the attraction of positive and negative charges. The surface of the carrier has certain cationic active groups, namely hydroxyl and other clean water groups, which can interact with negatively charged microorganisms in sewage. The fixed combination of bonds and valences is generated, so that microorganisms and biological enzymes are firmly fixed on the carrier, so that the survived microorganisms are not easy to be lost under the shearing action of water and gas, and the load of microorganisms is large and the volume load is high.

The biological filler 14 is pre-hanging film treatment, the inside of the biological filler 14 is loaded with anaerobic bacteria and/or facultative bacteria, and the outside of the biological filler 14 is loaded with aerobic bacteria. Specifically, the method of pre-hanging the membrane for the biological filler 14 includes: inoculating activated sludge in the aerobic tank, feeding the sewage to be treated, adding nutrient substrates such as urea, diamine, white sugar, etc. to supplement the nutrients required by the microorganisms. The biological fillers are stacked in the pool and left standing for 4-5 hours to inoculate solid microorganisms on the fillers. Then, aeration is performed intermittently, and aeration is performed every 2 hours for 1 hour. gas, control the dissolved oxygen at 2-4mg/L, after 15-20 days, the filler feels sticky and slippery to the touch, and when protozoa such as flagellates, bellworms, and paramecia appear, it means that the biological filler 14 has been filmed . The inside and surface of the pre-filmed biological filler 14 are filled with microorganisms suitable for the actual water quality, and according to the aerobic conditions of different microorganisms, the inside of the biological filler 14 is loaded with anaerobic bacteria and/or facultative bacteria, and the outside of the biological filler 14 is loaded with anaerobic bacteria and/or facultative bacteria. Loaded with aerobic bacteria, the biological filler 14 treated by pre-hanging film can quickly adapt to sewage treatment, and the treatment effect is better.

In the sewage COD purification device, the filling rate of the biological filler 14 is 5%-88%. The filling rate of the biological filler 14 can affect the flow effect of the filler in the sewage. The higher the filling rate, the worse the fluidity. On the contrary, the better the fluidity is. For different types of sewage, different filling rates of biological fillers 14 can be set, and setting the filling rate to 5%-88% can not only ensure fluidity, but also provide sufficient biological fillers 14 for sewage treatment.

As shown in FIG. 4 , the aeration device 11 includes a plurality of evenly distributed aeration pipes 111 , and an aeration disk 1111 is provided on the aeration pipes 111 . The evenly distributed aeration pipes 111 can make the gas distribution more uniform, so that the dissolved oxygen content in the sewage in different areas is consistent, and the aeration discs 1111 can further disperse the air, making the air distribution more uniform, and can cut the air into fine bubbles. The dissolution effect in water is better.

A sludge discharge port 16 is provided at the bottom of the tank body 1 , and the sludge discharge port 16 can discharge the sludge generated in the tank body 1 . During the COD purification process of sewage, sedimentary substances will be generated, and sludge will be formed at the bottom of the tank body 1. By setting the sludge discharge port 16 at the bottom of the tank body 1, the sludge can be regularly discharged according to the situation of sludge production, so as to avoid the sludge in the tank. Excessive accumulation in the body 1 affects the treatment effect of sewage.

Another embodiment of the present invention provides a sewage COD purification method, which adopts the above-mentioned sewage COD purification device for purification, including the following steps:

Step S1: Mix the sewage to be treated and the activated sludge containing COD degrading bacteria to form a mixed solution, pass the mixed solution into the sewage COD purification device, and put into the biological filler, aerate the device, and aerate for 8-24h , make the biological filler fully contact with the activated sludge, then discharge the mixed liquid, repeat 2-3 times, and then use continuous water inlet, continuous water outlet and continuous aeration to domesticate the microorganisms on the biological filler, and run continuously for 8-12d , when the biofilm grows on the biological filler, it means that the film is successfully formed;

Step S2, after the biological filler is successfully filmed, the sewage is passed into the sewage COD purification device, the dissolved oxygen concentration is controlled to be 5-12 mg/L, the hydraulic retention time is 0.5-5 h, and the sewage COD purification can be completed by continuous stirring during the process. deal with.

By using the above-mentioned sewage COD purification device to purify the sewage, the biological filler is pre-filmed. The biological filler after pre-filming contains a large number of active microorganisms and can fully contact the sewage, and the parameters in the treatment process are set as: dissolved oxygen content It is 5-12mg/L, and the hydraulic retention time is 0.5-5h. The increase of dissolved oxygen content can improve the COD degradation efficiency, but when the dissolved oxygen concentration is too high, it will lead to the formation of anoxic zone inside the biological filler, which is easy to cause low ammonia nitrogen degradation efficiency. However, if the dissolved oxygen content is too low, the COD degradation efficiency will be low. Setting the dissolved oxygen content to 5-12 mg/L can not only ensure a high COD degradation efficiency, but also form an oxygen-deficient zone inside the biological filler, which is helpful for To improve the degradation efficiency of ammonia nitrogen, the hydraulic retention time of 0.5-5h can fully degrade the COD in the sewage.

The following describes the treatment process of the sewage treatment system in conjunction with specific embodiments:

Example

In this embodiment, pretreated sewage is selected for COD purification treatment. After testing, the influent indicators are: chemical oxygen demand (COD) = 186.5 mg/L, total nitrogen (TN) = 45.3 mg/L, ammonia nitrogen (NH ₄ ⁺ -N) = 26.7 mg/L, total phosphorus (TP) = 2.5 mg/L.

The sewage COD purification device used in this embodiment includes: a tank body 1 and a fan 2. The tank body 1 is provided with an aeration device 11, a first sieve plate 12, a second sieve plate 13 and a mixer 15. The aeration device 11 and The mixer 15 is located at the bottom of the tank, the fan 2 is connected to the aeration device 11, the first sieve plate 12 is fixedly arranged above the aeration device 11, the second sieve plate 13 is movably arranged above the first sieve plate 12, and the first sieve plate 12 Between 12 and the second sieve plate 13, a polyurethane-modified biological filler 14 that has undergone pre-hanging film treatment is arranged. Two screws 121 are movably arranged on the first sieve plate 12 , two screw holes are correspondingly arranged on the second sieve plate 13 , a second gear 1211 is arranged on the top of the screw 121 , and a first gear 311 is arranged on the motor shaft 31 of the motor 3 , the first gear 311 is meshed with the second gear 1211, after starting the motor 3, the screw 121 can be driven to rotate, and the second sieve plate 13 can be moved up and down.

The sewage COD purification method adopted in this embodiment includes:

Step S1: Mix the sewage to be treated and the activated sludge containing COD degrading bacteria to form a mixed solution, pass the mixed solution into the sewage COD purification device, and put into the biological filler, aerate in the device, and aerate for 16 hours, so that the biological The filler is fully contacted with the activated sludge, and then the mixed liquid is discharged, repeated 3 times, and then the microorganisms on the biological filler are domesticated by means of continuous water inlet, continuous water outlet and continuous aeration, and the continuous operation is 10d. When the biological filler grows Biofilm means that the film is successfully formed;

Step S2, inputting the pretreated sewage into the tank of the sewage COD purification device, and starting the mixer to mix the sewage and the biological filler evenly;

Step S3, start the fan, aerate the tank through the aeration device, control the dissolved oxygen concentration to be 8mg/L, and ensure the flow rate of the sewage input, the hydraulic retention time is 2h, and keep the mixer in a working state during the treatment process;

In step S4, the treated sewage flows out through the overflow port at the top of the tank body, and the second sieve plate is moved downward every 20 days to squeeze the biological filler to perform desliming recovery treatment.

After testing, the indicators of sewage after COD purification treatment are: COD=9.3mg/L, TN=16.7mg/L, NH ₄ ⁺ -N=0.36mg/L, TP=0.08mg/L.

It can be seen from the results that the COD of the wastewater after COD purification treatment decreased by 95.0%, the TN decreased by 63.1%, the NH ₄ ⁺ -N decreased by 98.7%, and the TP decreased by 96.8%, which not only effectively treated the COD in the wastewater, but also Can significantly reduce total nitrogen, ammonia nitrogen and total phosphorus in sewage. This is because aerobic microorganisms are loaded on the outside of the pre-filmed bio-filler, which can effectively reduce COD, while the inside of the bio-filler is loaded with anaerobic microorganisms, which has a better effect on total nitrogen treatment, especially on ammonia nitrogen. obvious.

Although the present disclosure is disclosed above, the scope of protection of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims (10)

1. The sewage COD purification device is characterized by comprising a tank body (1) and a fan (2), wherein an aeration device (11), a first sieve plate (12) and a second sieve plate (13) are arranged in the tank body (1), the aeration device (11) is connected with the fan (2), the first sieve plate (12) and the second sieve plate (13) are positioned above the aeration device (11), and a biological filler (14) is arranged between the first sieve plate (12) and the second sieve plate (13), wherein the first sieve plate (12) is fixedly arranged in the tank body (1), the second sieve plate (13) is movably arranged above the first sieve plate (12), and the second sieve plate (13) is suitable for reciprocating movement in the up-down direction to extrude the biological filler (14).

2. The sewage COD purification apparatus according to claim 1, wherein a plurality of screws (121) are vertically movably arranged on the first sieve plate (12), screw holes are correspondingly arranged on the second sieve plate (13), the screws (121) pass through the screw holes, and when the screws (121) rotate, the second sieve plate (13) is suitable for moving up and down along the screws (121).

3. The sewage COD purification device of claim 2, further comprising a motor (3), wherein a motor shaft (31) of the motor (3) is provided with a first gear (311), the screw (121) is provided with a second gear (1211) engaged with the first gear (311), and the motor (3) is adapted to drive the screw (121) to rotate.

4. The sewage COD purification apparatus according to claim 1, wherein a stirrer (15) is further arranged in the tank body (1), and the stirrer (15) is obliquely arranged at the bottom of the tank body (1).

5. The sewage COD purification apparatus according to claim 1, characterized in that the biological filler (14) is a polyurethane modified bio-affinity filler.

6. The sewage COD purification apparatus according to claim 1, wherein the filling rate of the biological filler (14) is 5-88%.

7. The sewage COD purification apparatus according to claim 1, wherein the biological filler (14) is pre-coated with a membrane, the biological filler (14) is internally loaded with anaerobic bacteria and/or facultative bacteria, and the biological filler (14) is externally loaded with aerobic bacteria.

8. The sewage COD purification apparatus of claim 1, wherein the fan (2) is a submerged fan.

9. The sewage COD purification apparatus according to claim 1, wherein the tank (1) is provided with a sludge discharge port (16) at the bottom, the sludge discharge port (16) being adapted to discharge sludge generated in the tank (1).

10. A sewage COD purification method, which is characterized by using the sewage COD purification apparatus according to any one of claims 1 to 9, comprising the steps of:

step S1, mixing sewage to be treated and activated sludge containing COD degrading strains to form a mixed solution, introducing the mixed solution into a sewage COD purification device, adding a biological filler, aerating by using an aeration device, aeration for 8-24 hours to fully contact the biological filler with the activated sludge, then discharging the mixed solution, repeating for 2-3 times, then domesticating microorganisms on the biological filler by adopting continuous water inlet, continuous water outlet and continuous aeration modes, and continuously operating for 8-12d, wherein when a biological film grows on the biological filler, the successful film hanging is shown;

and step S2, after the biofilm formation of the biological filler is successful, introducing the sewage into the sewage COD purification device, controlling the concentration of dissolved oxygen to be 5-12mg/L and the hydraulic retention time to be 0.5-5h, and continuously stirring in the process to finish the sewage COD purification treatment.

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