CN111792763A - High turbidity water treatment device and sewage treatment system - Google Patents

Abstract

The invention provides a high turbidity water treatment device, which comprises: the device comprises a first stirrer, a guide cylinder, a second stirrer, a rectifying plate and a settling zone, wherein the first stirrer is arranged in a coagulation tank, high-turbidity water enters the coagulation tank, a nano flocculating agent is added, and the high-turbidity water is rapidly stirred by the first stirrer to perform coagulation reaction with the nano flocculating agent; the draft tube and the second stirrer are arranged in the flocculation tank, high turbid water after coagulation enters the draft tube, is stirred and lifted out of the draft tube by the second stirrer, and enters the precipitation zone after passing through the rectifying plate to undergo precipitation reaction and carry out pollution discharge treatment. The invention utilizes the nano-scale flocculation technology to provide good flocculation conditions, improve flocculation and sedimentation effects and shorten sedimentation time; the forms of the mud scraper and the mud pump are improved, the reliability of the equipment is improved, and the higher turbidity water can be reduced to the conventional water inlet standard under the condition of not enlarging the area and the depth of the sedimentation tank.

Description

High turbidity water treatment device and sewage treatment system

technical field

The invention relates to the technical field of sewage treatment, in particular to a high-turbidity water treatment device.

Background technique

At present, my country is in a state of strictly controlling the ecological red line, and attaches great importance to sewage treatment. In the practical application of sewage treatment, the influent turbidity (SS) of sewage treatment plants in special areas often exceeds the SS influent value specified in the "Water Quality Standards for Sewage Discharged into Urban Sewers", reaching several thousand milligrams per liter. Most of them are clay and silt, which have a great impact on the sewage treatment plant. If other conventional primary sedimentation tanks are designed according to the conditions exceeding the standard, the investment will be high and the area will be large; if they are designed according to the normal management standards, they will not be able to resist High-load impact, there is a risk of equipment damage or excessive water output. For the treatment of high turbidity water in the existing sewage treatment process, the most commonly used sedimentation tank is the sedimentation tank. Sedimentation tank. However, some traditional sedimentation tanks have low load and large footprint, some deep tanks, some complex equipment, high operation and maintenance costs, and poor impact resistance, which are not suitable for high turbidity influent water.

For the vertical flow sedimentation tank, it only removes the particles whose sedimentation speed is greater than or equal to the rising speed of the water flow, and the selected value of the surface load is small, that is, the surface area of the tank is large and the area is large, so it is less used in practical applications. The advection sedimentation tank is the most widely used sedimentation tank at present, with stable performance and high removal efficiency. It is the earliest and most widely used mud-water separation structure in my country. Separation area), the bottom is the sludge storage area, the sludge in the sludge storage area is discharged out of the tank through the sludge suction machine and the sludge scraping pipe. The failure rate of the mud machine is high, and the truss truck type needs a high headroom, and the mud pump needs frequent maintenance or replacement because of the serious wear and tear of the sedimented sediment. For the amplitude flow sedimentation tank, it is a traditional water treatment structure that uses the gravity sedimentation of particles or flocs to remove suspended solids in the water. However, the water flow velocity of the amplitude flow sedimentation tank is unstable and is greatly affected by the water inflow; the bottom scraping and sludge discharging equipment is complex, the requirements for the construction unit are high, and the floor area is larger than other sedimentation tanks. For the inclined plate (inclined tube) sedimentation tank, the sedimentation efficiency is high and the residence time is short. It is suitable for the primary sedimentation tank and should not be used as the secondary sedimentation tank. Under certain conditions, the inclined plate equipment has problems such as growth of algae, which is inconvenient to maintain and manage; it is difficult to discharge the mud by gravity. For the high-density sedimentation tank, it is a high-speed integrated sedimentation/concentration tank. The sedimentation speed can reach 20m/h, the quality of clarified water is high, and the impact load resistance is strong, but the tank body and equipment are complex, the tank body is deep, and the investment is high.

After searching, the patent document CN203355388U discloses an integrated sand settling tank. The prior art adopts mechanical sludge discharge or perforated pipe sludge discharge, which belongs to an improved version of the inclined plate sedimentation tank. The tank body is relatively deep, and the flocculation section adopts hydraulic power. Flocculation requires a large area, and will cause a heavy burden on the sewage pipe, which will increase the operating load of the pump. Patent document CN204093101U discloses a baffled coagulation rapid settling tank, including a tank body, the upper part of the tank body is equipped with a truss, and the tank body is divided into a flocculation tank area and a sedimentation tank area by a partition wall, and the sedimentation tank area is installed. There is a discharge rack, the upper part of the sedimentation tank area is equipped with a water outlet, and at least one partition is installed in the flocculation tank area. The partition plate divides the flocculation tank area into at least two flocculation areas. There are multiple baffle flocculation plates, and the distance between two adjacent baffle flocculation plates gradually increases from front to back. Each baffle flocculation plate includes a connecting plate and a baffle plate. It is made of plate, and the bent sections of the baffle plates on the bottom of the pool and the truss are arranged oppositely. The disadvantage of the prior art is that the use of siphon sludge discharge will increase the risk of air leakage of the sewage pump, resulting in the failure of the sewage pump; the baffles set by baffle flocculation are too many, occupy a large area, rely solely on hydraulic action, and have low efficiency , and more consumables.

SUMMARY OF THE INVENTION

In view of the defects in the prior art, the purpose of the present invention is to provide a high-turbidity water treatment device and a sewage treatment system, which adopts the addition of nano-flocculants to improve the flocculation efficiency, increase the particle settling speed, shorten the settling time, and reduce the floor space. , the turbidity removal rate can reach up to 85%; the invention is especially suitable for underground sewage treatment plants.

A high-turbidity water treatment device provided according to the present invention includes: a first mixer, a guide cylinder, a second mixer, a rectifying plate and a sedimentation zone,

Among them, the first mixer is set in the coagulation tank, the high turbidity water enters the coagulation tank, and the nano-flocculant is put into it, and the coagulation reaction occurs with the nano-flocculant through the rapid stirring of the first mixer; the guide cylinder and the second mixer are set in the flocculation tank. In the process, the coagulated high turbidity water enters the diversion cylinder, and is stirred and lifted out of the diversion cylinder by the second mixer. The flocculated high turbidity water passes through the rectifier plate and enters the sedimentation zone for precipitation reaction and sewage treatment; the diversion cylinder is provided with multiple blocks plate.

Preferably, it also includes a water inlet area, the water inlet area includes a water inlet pipe and a water inlet baffle, the water inlet pipe is connected with the water inlet baffle, and is connected to the coagulation tank.

Preferably, it also includes a water distribution plate, the water distribution plate is connected to the rectifying plate, the water distribution plate is provided with water distribution holes and a water passage, and the water passage is arranged at the lower end of the water distribution plate.

Preferably, the sedimentation area includes a screw conveyor sludge discharger, a sludge hopper and a slurry sludge discharge pump. After the flocculated high turbidity water undergoes a sedimentation reaction, flocs that can be removed are formed and deposited in the sludge hopper. The screw conveyor sludge discharger The flocs that can be removed are transported to the front end of the sludge hopper, pumped out by the slurry pump and discharged into the sludge storage tank.

Preferably, the sedimentation area further includes an electric slag skimming pipe, a slag discharge water pipe and a slag grid frame. The scum in the high-turbidity water is collected and discharged to the slag grid frame periodically through the electric slag skimming pipe, and the sewage filtered out of the scum enters the bottom of the slag grid frame. The water channel is discharged to the structure at the front end of the water inlet area through the slag discharge pipe.

Preferably, the sedimentation area further includes a water collection tank, a water outlet channel and a water outlet pipe, and the clarified water after the flocculation treatment and scum filtration of the high turbidity water passes through the water collection tank and enters the water outlet channel, and then enters the next treatment structure through the water outlet pipe.

Preferably, the sedimentation zone further includes a sludge level gauge, which can monitor the sludge level,

When the liquid level of the flocs that can be removed rises to the set threshold value A, the slurry pump can be turned on for sewage discharge;

When the liquid level of the flocs that can be removed drops to the set threshold B, the slurry pump can be turned off to stop the sewage,

The flocs that can be removed in the present invention are also commonly referred to as sludge.

Preferably, the precipitation zone also includes a vent pipe. When the high-turbidity water treatment device needs to be repaired, the vent tube can lower the liquid level in the precipitation zone to the opening of the sludge hopper, and the remaining flocs that can be removed are discharged through the slurry. Mud pump discharge.

Preferably, it also includes a diversion cylinder base, the diversion cylinder base has a hydraulic diversion effect, is arranged below the diversion cylinder, and the two sides of the diversion cylinder base are arc-shaped.

According to a sewage treatment system provided by the present invention, the above-mentioned high-turbidity water treatment device is used to treat the high-turbidity water.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention increases the size of flocs after coagulation, increases the surface load, and significantly improves the removal efficiency of turbidity in high-turbidity water by using nano-flocculants.

2. The present invention makes flocculation more sufficient and avoids short flow by adopting a diversion cylinder, a mixer, a diversion cylinder foundation with hydraulic diversion effect, a rectifier plate, and the like.

3. In the present invention, the flocculation tank is divided into two parts by setting the baffle of the guide cylinder. The water enters the tank from the upper opening of the flocculation tank, and enters the barrel downward through the guide part of the base of the guide cylinder, and is fully mixed. The other side of the flow cylinder flows out, and finally enters the sedimentation zone through the rectification device, so that the flocculation effect is good, and more and larger flocs are produced, which increases the vertical speed of the floc particles. Under the same removal rate, the interception speed can be reduced. , that is, shorten the residence time and save the sedimentation area.

4. The present invention reduces the failure rate of the mud scraper and improves the sedimentation per unit time by using the shaftless screw conveying mud scraper to replace the traditional chain plate type mud scraper, hydraulic reciprocating mud scraper, and truss-car type mud scraper. The amount of sludge conveyed is suitable for treating high turbidity influent water.

5. The invention improves the overall reliability of the equipment by using a wear-resistant slurry pump to replace the traditional submersible sewage pump and cam sand suction pump, solves the problem of frequent replacement, does not increase investment, and integrates the pump with the sedimentation tank Installation, fully save the floor space.

6. The present invention can collect scum by setting a slag skimming device in the sedimentation area, so that the water in the outlet pipe is more clarified.

7. The present invention can reduce the liquid level in the sedimentation zone when the high-turbidity water treatment device is overhauled by setting a vent pipe in the sedimentation zone, so as to achieve the purpose of overhauling and cleaning.

8. The present invention adopts steel integrated equipment, which is easy to install, reduces construction period, saves land occupation, and relieves the situation of land shortage in sewage treatment plant.

9. The residence time of the present invention in the sedimentation zone is 13-17min, the residence time of the traditional sedimentation tank is 0.5-2.0h when used as the primary sedimentation tank, and the residence time as the secondary sedimentation tank is 1.5-4h (the high-efficiency clarification inclined plate sedimentation tank 25- 30min), the water supply field is 1.5-3h for the sedimentation tank, the hydraulic retention time of the present invention is the shortest, that is, the floor space is saved, the treatment efficiency is high, and the economic benefit is good.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

Fig. 1 is the sectional view of the high turbidity water treatment device 1-1 angle;

Fig. 2 is the top view of the overall structure of the high turbidity water treatment device;

Fig. 3 is the sectional view of the high turbidity water treatment device 2-2 angle;

FIG. 4 is a cross-sectional view of the high-turbidity water treatment device at an angle of 3-3.

In the picture:

Detailed ways

The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.

As shown in Figure 1, Figure 2, Figure 3, Figure 4, the present invention provides a high-turbidity water treatment device, including a water inlet pipe 1, a water inlet baffle 2, a first mixer 3, a guide tube base 4, and a guide tube 5. The second mixer 6, the rectifier plate 7, the water distribution plate 8, the screw conveying sludge discharger 9, the electric slag skimming pipe 10, the sludge level gauge 11, the box body 12, the water collecting tank 13, the water outlet channel 14, the water outlet pipe 15 , slag discharge water pipe 16 , vent pipe 17 , slag grid frame 18 , sludge hopper 19 and slurry sludge discharge pump 20 .

Among them, the high turbidity water enters from the water inlet pipe 1, and the water inlet baffle 2 is connected to the water inlet pipe 1 and is connected to the coagulation tank. The high-turbidity water enters the coagulation tank from the lower part of the coagulation tank, and the nano-flocculant is added into the coagulation tank. The upper hole enters the flocculation tank, and the flow of high-turbidity water is blocked by the side baffle on the diversion cylinder 5, passes through the diversion cylinder foundation 4, enters the diversion cylinder from the bottom of the diversion cylinder 5, and is stirred by the second mixer 6 in the flocculation tank. Lift out the guide tube 5, after the water flow comes out of the guide tube 5, the water is blocked by the rectifier plate 7, and the water flow passes over the other side baffle on the guide tube 5 from top to bottom, and then passes upward through the grid at the bottom of the rectifier plate 7. The strip enters the sedimentation area, and distributes water through the water distribution hole on the water distribution plate 8 and the water passage at the lower end. After rectification, the sedimentation reaction begins. After the flocculated high-turbidity water undergoes the sedimentation reaction, the particles in the high-turbidity water that are greater than the retention rate of the sedimentation tank are all removed. Removal, the particle flocs in high turbidity water are less than the retention rate of the sedimentation tank, that is, the flocs that can be removed and the flocs that cannot be removed are formed, in addition to the scum in the high turbidity water. The flocs that can be removed are deposited in the sludge hopper 19, and are transported to the most front and deepest part of the sludge hopper 19 by the screw conveyor sludge discharger 9, and are pumped out by the slurry sludge discharge pump 20 and sent to the sludge storage tank.

Further, the scum on the upper part of the box body 12 is periodically collected and discharged into the slag screen frame 18 through the electric skimming pipe 10 , and the sewage containing the flocs that have not been removed and the scum filtered out enters the water channel at the bottom of the slag screen frame 18 , through the slag discharge water pipe 16 to be discharged to the front structure (such as a coarse grid) of the water inlet, and the scum in the slag grid frame 18 is regularly cleaned and transported.

Furthermore, the clarified water in the upper part of the box body 12 is collected by the water collecting tank 13 and enters the water outlet channel 14, and then enters the next treatment structure through the water outlet pipe 15.

In addition, the sedimentation tank continuously enters and exits water. When maintenance is required, the liquid level is lowered to the top of the sludge hopper 19 by the venting pipe 17. After the excess sludge is pumped to the sludge channel by the sewage pump, the maintenance can be started. . When the device is running, the sludge level can be monitored by the sludge level gauge 11. When the sludge reaches a set high level, the slurry pump 20 is turned on, and when the sludge drops to a low level, the slurry pump 20 is turned off.

The turbidity of the high-turbidity water in the present invention is between 300-2000 mg/L, and the flocs that can be removed in the present invention are also commonly referred to as sludge.

Preferred examples of the present invention will be further described.

Based on the above basic embodiment, when the included angle between the sludge hopper 19 and the bottom of the box 12 is 55°, the sludge carried by the sludge hopper 19 is easy to collect and extract.

Based on the above basic embodiment, the first mixer 3 adopts a high-speed mixer, so that the high-turbidity water can fully contact the flow section; the second mixer 6 uses a low-speed mixer, so that the high-flushing water can fully flocculate.

The invention provides a high-turbidity water treatment device, which utilizes nano-scale flocculation technology to provide good flocculation conditions to improve flocculation and precipitation effects, shorten precipitation time, improve the form of mud scraper and mud pump, and improve equipment reliability. High turbidity water can be reduced to conventional influent standards without enlarging the area and depth of the sedimentation tank.

In the present invention, a nano-scale flocculant with large specific surface area and high surface energy is used to increase the size of the floc after coagulation, increase the surface load, and significantly improve the removal efficiency. The proportion of SS inorganic clay removed in the sedimentation tank is relatively high (sand particles with a particle size larger than 200um are removed by the aerated grit chamber), and the clay colloid particles are usually negatively charged. The main reason is that the addition of flocculant reduces the colloid potential, the surface charge decreases, and the colloid particles collide with each other, destabilize, and coagulate. At the same time, the flocculant also plays the role of adsorption and bridging. The polymer flocculant uses its long molecular chain structure to adsorb negatively charged colloidal particles in the solution, linking the colloidal particles to form larger flocs. After adding nano-scale flocculant to the water, the colloidal particles quickly coagulate into larger particles, and then the sedimentation speed increases, which is equivalent to removing more suspended solids without reducing the retention speed, thus saving the sedimentation area. Compared with ordinary flocculants, nanomaterials have the unique advantages of large specific surface area and high surface energy, and usually have better removal effect and faster removal efficiency of pollutants. Using nano-flocculant, the dosage of 100μL/L, the removal rate of SS can be more than 85%. If it is inconvenient to purchase chemicals at the project site, common polymer flocculants can be used instead, and the removal rate can still reach 80%, but the consumption of chemicals will increase.

The invention adopts a special high-efficiency flocculation device, which reduces the flocculation and precipitation time and saves land occupation. In the flocculation tank, 3 baffles, 1 diversion cylinder, 1 mixer, 1 rectifier plate, and 1 diversion cylinder foundation with hydraulic diversion function are set to make flocculation more sufficient and avoid short flow. The flocculation tank is divided into two parts by the baffle of the diversion cylinder. The water enters the tank from the upper opening of the flocculation tank, goes down through the diversion part of the base of the diversion cylinder, enters the barrel, and is fully mixed, and flows from the other side of the diversion cylinder. It flows out, and finally enters the sedimentation zone through the rectifier plate. The flocculation effect is good and the larger flocs are produced, which increases the vertical speed of the floc particles. Under the same removal rate, the retention speed can be reduced, that is, the residence time is shortened and the sedimentation area is saved.

The equipment provided by the invention can be used in water plants with high influent SS, and solves the situation of impact on sewage plants when the influent SS exceeds the standard of "Water Quality Standard for Sewage Discharged into Urban Sewers". Solved the problem of stuck, deformed and damaged mud scraper in sedimentation tank of water plant when the influent SS is high. It solves the problem of large wear and frequent replacement of the sludge pump in the primary sedimentation tank, and does not increase investment. The equipment described in the invention is an integrated steel equipment, which is easy to install, reduces construction period, saves land occupation, and relieves the situation of land shortage in water plants.

The invention not only improves the treatment effect but also reduces the investment. The residence time of the high turbidity water in the sedimentation tank is 13-17.0min, the residence time of the traditional sedimentation tank as the primary sedimentation tank is 0.5-2.0h, and the residence time of the secondary sedimentation tank is 13-17.0min. 1.5-4h (25-30min for high-efficiency clarification inclined plate sedimentation tank), 1.5-3h for sedimentation tank in water supply area. By comparison, it can be seen that the equipment described in this patent has the shortest hydraulic retention time, that is, saves floor space, has high treatment efficiency, and has good economic benefits. The invention has simple operation and stable running state. The invention can accommodate a large amount of sediment in a short time in combination with a special sludge discharger structure, and the special sludge discharge pump is used to greatly reduce the damage rate.

The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essential content of the present invention. The embodiments of the present application and features in the embodiments may be arbitrarily combined with each other without conflict.

Claims (10)

1. A high turbidity water treatment apparatus, comprising: a first stirrer (3), a guide cylinder (5), a second stirrer (6), a rectifying plate (7) and a settling zone,

the first stirrer (3) is arranged in the coagulation tank, high-turbidity water enters the coagulation tank, the nano flocculant is added, and the high-turbidity water is quickly stirred by the first stirrer (3) to perform coagulation reaction with the nano flocculant;

the guide shell (5) and the second stirrer (6) are arranged in the flocculation tank, the coagulated high-turbidity water enters the guide shell (5), is stirred and lifted out of the guide shell (5) by the second stirrer (6), and enters the precipitation zone through the rectifying plate (7) to undergo precipitation reaction and carry out pollution discharge treatment;

the guide shell (5) is provided with a plurality of baffles.

2. The high turbidity water treatment device according to claim 1, further comprising a water inlet region, wherein the water inlet region comprises a water inlet pipe (1) and a water inlet baffle (2), and the water inlet pipe (1) is connected with the water inlet baffle (2) and connected to the coagulation tank.

3. The high turbidity water treatment device according to claim 1, further comprising a water distribution plate (8), wherein the water distribution plate (8) is connected with the rectifying plate (7), the water distribution plate (8) is provided with water distribution holes and a water passing part, and the water passing part is arranged at the lower end of the water distribution plate (8).

4. The high muddy water treatment device according to claim 1, wherein the settling zone comprises a screw conveying sludge discharging machine (9), a sludge hopper (19) and a slurry sludge discharging pump (20), the flocculated high muddy water is precipitated in the sludge hopper (19) after a precipitation reaction to form flocs which can be removed, the screw conveying sludge discharging machine (9) conveys the flocs which can be removed to the foremost end of the sludge hopper (19), and the flocs are pumped out by the slurry sludge discharging pump (20) and discharged into the sludge storage tank.

5. The high-turbidity water treatment process device according to claim 1, wherein the settling zone further comprises an electric skimming pipe (10), a deslagging pipe (16) and a grid slag frame (18), scum in the high-turbidity water is collected and discharged to the grid slag frame (18) at regular time through the electric skimming pipe (10), and sewage with scum filtered enters a water channel at the bottom of the grid slag frame (18) and is discharged to a structure at the front end of the water inlet zone through the deslagging pipe (16).

6. The high-turbidity water treatment apparatus according to claim 1, wherein the settling zone further comprises a water collection tank (13), an outlet channel (14) and an outlet pipe (15), and the clarified water of the high-turbidity water after flocculation treatment and scum filtration passes through the water collection tank (13), enters the outlet channel (14), and then enters the next treatment structure through the outlet pipe (15).

7. The high-turbidity water treatment apparatus according to claim 1, wherein said sedimentation zone further comprises a sludge level meter (11), said sludge level meter (11) being capable of sludge level monitoring,

when the liquid level of the flocs which can be removed rises to a set threshold A, a slurry sludge pump can be started to discharge sewage;

when the liquid level of the flocs which can be removed is reduced to a set threshold value B, the slurry sludge pump can be closed to stop discharging the sewage.

8. The high-turbidity water treatment device according to claim 4, wherein the settling zone further comprises an emptying pipe (17), when the high-turbidity water treatment device needs to be overhauled, the emptying pipe (17) can lower the liquid level of the settling zone to the opening of the sludge hopper (19), and the residual flocs which can be removed are discharged through a sludge discharge pump (20).

9. The high-turbidity water treatment device according to claim 1, further comprising a guide shell foundation (4), wherein the guide shell foundation (4) has a hydraulic guide effect and is arranged below the guide shell (5), and two sides of the guide shell foundation (4) are arc-shaped.

10. A sewage treatment system characterized in that the high-turbidity water is treated by using the high-turbidity water treatment apparatus according to any one of claims 1 to 9.

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