A multi-stage high-efficiency coagulation and sedimentation integrated device

Abstract

The present invention relates to a multi-stage high-efficiency coagulation and sedimentation integrated device, comprising a multi-stage conditioning coagulation and sedimentation tank and a plurality of supernatant buffer tanks arranged step by step according to the water level line, the conditioning coagulation and sedimentation tanks all include a coagulation and stirring zone, a coagulation reaction and sedimentation zone, a sedimentation and gathering zone and a supernatant zone, the first stage of the conditioning coagulation and sedimentation tank is provided with an inlet pipe connected to the inside, the two adjacent stages of the conditioning coagulation and sedimentation tanks and the conditioning coagulation and sedimentation tanks and the supernatant buffer tank are connected through overflow pipes, the inlet and outlet of the supernatant buffer tank are provided with valves, the bottom of the supernatant buffer tank is connected to the inlet pipe through an outlet pipe, and a water pump is provided on the outlet pipe. The present invention can realize multi-stage high-efficiency conditioning + coagulation + sedimentation pretreatment of the coagulation and sedimentation supernatant on a modular set of devices, prevent compaction and sedimentation blockage under the action of stirring and scraping mud, and facilitate mud cleaning.

Description

Technical Field

[0001] The invention relates to the field of environmental protection engineering, in particular to a multi-stage high-efficiency coagulation and sedimentation integrated device, and more particularly to pretreatment of heavily polluted sewage. Background Art

[0002] The coagulation sedimentation tank is a type of sedimentation tank in water supply and drainage. The coagulation process is the most basic and extremely important treatment process in the treatment of industrial water and domestic sewage. By adding some reagents (usually called coagulants and coagulants) to the water, the particles in the water that are difficult to precipitate can aggregate with each other to form colloids, and then combine with impurities in the water to form larger flocs. The "supernatant" after coagulation and sedimentation of heavily polluted sewage still has obvious color or irritating odor, and the content of pollutants such as COD and ammonia nitrogen is very high, requiring efficient multi-stage conditioning + multi-stage coagulation + multi-stage sedimentation process pretreatment.

[0003] However, the current multi-stage coagulation and sedimentation devices are difficult to meet the needs of this process. For example, "A High-efficiency Coagulation and Sedimentation Tank CN201020669149.6", "Multi-stage Inclined Plate Coagulation and Sedimentation Device CN201721628439.4", "Multi-stage Coagulation and Sedimentation Device CN202011267556.9", and "Multi-stage Coagulation and Sedimentation Device CN202011578959.5" do not have a multi-stage conditioning function. Their multi-stage coagulation and sedimentation are all equipped with traditional baffle sedimentation. The dispersion of sedimentation can easily cause sludge clearing difficulties. Multiple sets of devices are required to complete the multi-stage conditioning and multi-stage coagulation and sedimentation functions of the supernatant after coagulation and sedimentation. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems and to propose a multi-stage high-efficiency conditioning, coagulation and sedimentation integrated device for pretreatment of heavily polluted sewage. By installing the device on a standard container frame, "three-stage +" high-efficiency coagulation and sedimentation can be achieved. If the supernatant water body after the three-stage coagulation and sedimentation pretreatment does not meet the pretreatment requirements, the water body in the supernatant buffer tank can be re-treated with three-stage high-efficiency coagulation and sedimentation pretreatment, and the functions of acid-base conditioning + coagulation + inclined plate / inclined tube sedimentation + sludge scraping and stirring are achieved in each stage of coagulation and sedimentation.

[0005] To achieve the above-mentioned objectives, the present invention provides a multi-stage high-efficiency coagulation and sedimentation integrated device, comprising a multi-stage tempering coagulation and sedimentation tank arranged along the water flow direction and step by step according to the water level line, and a plurality of supernatant buffer tanks, the tempering coagulation and sedimentation tanks all include a coagulation and stirring zone at the inlet of the tank, a coagulation reaction and sedimentation zone in the middle layer of the tank, a sedimentation and aggregation zone in the lower layer of the tank, and a supernatant zone in the upper layer of the tank, the water inlet of the coagulation and stirring zone is provided with a tempering liquid inlet and a static pipeline agitator, the coagulation and stirring zone is provided with a coagulant stirring motor, a coagulant inlet, a coagulant aid inlet and a counter-directional double-paddle agitator arranged at the end of the coagulant stirring motor, the coagulation reaction and sedimentation zone is provided with a coagulant inlet, a coagulant aid inlet and a coagulant aid inlet. A micro-aeration unit and an inclined plate / inclined tube sedimentation unit are sequentially arranged on the side, the sedimentation and gathering area is provided with a sludge scraping and stirring motor and a sludge scraping and stirring blade arranged at the end of the sludge scraping and stirring motor, a sludge discharge hole is arranged at the bottom of the sedimentation and gathering area, a suspended matter cleaner is arranged on the water surface of the supernatant area, the first stage of the tempering and coagulation sedimentation tank is provided with an inlet pipe connected to the inside, the two adjacent stages of the tempering and coagulation sedimentation tanks and the tempering and coagulation sedimentation tanks and the supernatant buffer tank are connected through an overflow pipe, valves are arranged on the inlet and outlet of the supernatant buffer tank, the bottom of the supernatant buffer tank is connected with the inlet pipe through an outlet pipe, and a water pump is arranged on the outlet pipe.

[0006] Preferably, the lower port of the coagulant inlet is located above the counter-rotating double-blade agitator, and the lower port of the coagulant aid inlet is located in the middle of the double paddles of the counter-rotating double-blade agitator.

[0007] Preferably, a guide plate is provided at the lower end of the coagulation and stirring zone.

[0008] Preferably, the bottom of the sedimentation and accumulation zone is V-shaped, the radius of the scraper and agitator blade decreases step by step from bottom to top, and the edge of the scraper and agitator blade is close to the bottom edge of the sedimentation and accumulation zone.

[0009] Preferably, the supernatant buffer tank includes a first buffer tank and a second buffer tank, and the supernatant overflowing from the last stage of the conditioning coagulation sedimentation tank enters the first buffer tank or the second buffer tank, and valves are provided between the first buffer tank and the second buffer tank and the overflow pipe.

[0010] Preferably, when the water quality of the first buffer pool and the second buffer pool reaches the pretreatment target, the valve on the first buffer pool or the second buffer pool is opened, and the water is pumped out along the outlet pipe to the discharge outlet by the pump.

[0011] Preferably, when the water quality of the first buffer tank and the second buffer tank does not meet the pretreatment target, the valve on the first buffer tank or the second buffer tank is closed, and the substandard water is pumped to the inlet pipe through the outlet pipe by a pump, and then undergoes a round of multi-stage conditioning + coagulation + sedimentation pretreatment, and then the supernatant water is discharged to another empty supernatant buffer tank.

[0012] Preferably, the micro-aeration unit comprises an ABS plastic aeration head and an ABS plastic air pipe.

[0013] Preferably, the inclined plate / inclined tube sedimentation unit comprises a hexagonal honeycomb inclined plate and inclined tube filler and a filler support frame.

[0014] Based on the above technical solution, the advantages of the present invention are:

[0015] The multi-stage high-efficiency coagulation and sedimentation integrated device of the present invention is provided with multi-stage conditioning coagulation and sedimentation and a supernatant buffer tank. The supernatant of each coagulation and sedimentation tank can be subjected to the next stage of conditioning + coagulation + sedimentation. If the water quality of the final supernatant buffer tank still fails to reach the pretreatment target, the water of the supernatant buffer tank is pumped back to the first stage conditioning coagulation and sedimentation tank for coagulation and sedimentation treatment. The present invention can realize multi-stage high-efficiency conditioning + coagulation + sedimentation pretreatment of the coagulation and sedimentation supernatant on a modular set of devices. The sedimentation of each conditioning coagulation and sedimentation tank is concentrated at the bottom of its conical tank. Under the action of stirring and scraping mud, compaction sedimentation and clogging are prevented, which is conducive to mud cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a multi-stage high-efficiency coagulation and sedimentation integrated device. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0019] The present invention provides a multi-stage high-efficiency coagulation and sedimentation integrated device, such as Figure 1 As shown, a preferred embodiment of the present invention is shown. The multi-stage high-efficiency coagulation and sedimentation integrated device of the present invention is provided with multi-stage conditioning coagulation and sedimentation and supernatant buffer tanks, and the supernatant of each coagulation and sedimentation tank can be subjected to the next stage of conditioning + coagulation + sedimentation. If the water quality of the final supernatant buffer tank still fails to meet the pretreatment target, the water of the supernatant buffer tank is pumped back to the first stage conditioning coagulation and sedimentation tank for coagulation and sedimentation treatment.

[0020] Specifically, the multi-stage high-efficiency coagulation and sedimentation integrated device includes a multi-stage tempering coagulation and sedimentation tank height arranged along the water flow direction and gradually decreasing according to the water level line, and a plurality of supernatant buffer tank 4 heights. The tempering coagulation and sedimentation tanks include a coagulation and stirring zone D at the inlet of the tank, a coagulation reaction and sedimentation zone B in the middle layer of the tank, a sedimentation and aggregation zone C in the lower layer of the tank, and a supernatant zone A in the upper layer of the tank. The water inlet of the coagulation and stirring zone D is provided with a tempering liquid inlet 6 and a static pipeline agitator 7. The coagulation and stirring zone D is provided with a coagulant stirring motor 10, a coagulant inlet 11, a coagulant aid inlet 12 and a counter-directional double-blade agitator 8 arranged at the end of the coagulant stirring motor 10. Micro-aeration units are provided on the upper side of the coagulation reaction and sedimentation zone B in sequence. 17 and inclined plate / inclined tube sedimentation unit 16, the sedimentation and gathering area C is provided with a sludge scraping and stirring motor 14 and a sludge scraping and stirring blade 15 arranged at the end of the sludge scraping and stirring motor 14, the bottom of the sedimentation and gathering area C is provided with a sludge discharge hole 20, the water surface of the supernatant area A is provided with a suspended matter cleaner 13, the first stage of the tempering and coagulation sedimentation tank is provided with an inlet pipe 5 connected to the inside, the two adjacent stages of the tempering and coagulation sedimentation tanks and the tempering and coagulation sedimentation tanks and the supernatant buffer tank 4 are connected through an overflow pipe 18, the inlet and outlet of the supernatant buffer tank 4 are provided with valves 19, the bottom of the supernatant buffer tank 4 is connected to the inlet pipe 5 through an outlet pipe 21, and the outlet pipe 21 is provided with a water pump 22.

[0021] like Figure 1 As shown, heavily polluted sewage enters the coagulation and stirring zone D of the primary conditioning coagulation sedimentation tank 1 through the water inlet pipe 5, and the water inlet pipe 5 is provided with an acid and alkali conditioning liquid inlet 6 and a static pipe agitator 7; the coagulation and stirring zone D is provided with a coagulant stirring motor 10, a coagulant inlet 11, a coagulant aid inlet 12 and a counter-rotating double-paddle agitator 8; the lower port of the coagulant inlet is above the counter-rotating double-paddle agitator 8, and the lower port of the coagulant aid inlet is in the middle of the double paddles of the counter-rotating double-paddle agitator 8, and a guide plate 9 is provided at the lower end of the coagulation and stirring zone D to prevent part of the condensed matter from directly settling along the tank wall and increasing the difficulty of scraping and stirring.

[0022] After being conditioned, coagulant, and coagulant aid, the sewage enters the coagulation reaction and sedimentation zone B, and the generated agglomerates are directly precipitated to the sedimentation and aggregation zone C. A micro-aeration unit 17 and an inclined plate / inclined tube sedimentation unit 16 are arranged above the coagulation reaction and sedimentation zone B. The micro-aeration unit 17 promotes the unagglomerated particles to move upward faster, and produces large and good agglomerates in the inclined plate / inclined tube sedimentation device. These agglomerates are precipitated to the sedimentation and aggregation zone C through the B zone.

[0023] Preferably, the micro-aeration unit 17 includes an ABS plastic aeration head and an ABS plastic air pipe. Preferably, the inclined plate / inclined tube sedimentation unit 16 includes a hexagonal honeycomb inclined plate and inclined tube filler (PP or glass fiber reinforced plastic material) and a filler support frame.

[0024] In order to prevent the sludge in the sedimentation and accumulation area C from compaction and clogging and facilitate sludge removal, the conditioning coagulation sedimentation tank is provided with a sludge scraping and stirring blade 15 and a sludge scraping and stirring motor 14, and the sludge in the sedimentation and accumulation area C is discharged from the sludge discharge hole 20 under the suction action of the sludge pump. Preferably, the bottom of the sedimentation and accumulation area C is V-shaped, the radius of the sludge scraping and stirring blade 15 decreases step by step from bottom to top, and the edge of the sludge scraping and stirring blade 15 is close to the bottom edge of the sedimentation and accumulation area C.

[0025] Above the inclined plate / inclined tube sedimentation unit 16 is the supernatant area A. There are often light particulate suspensions and foams on the top of the supernatant area A. These light substances are driven, sucked and removed by the suspended matter cleaner 13 floating on the water surface. Preferably, the supernatant buffer tank 4 includes a first buffer tank and a second buffer tank. The supernatant overflowing from the last stage of the conditioning coagulation sedimentation tank enters the first buffer tank or the second buffer tank. A valve 19 is provided between the first buffer tank and the second buffer tank and the overflow pipe 18.

[0026] The water in the supernatant area A flows out of the original conditioning coagulation sedimentation tank through the overflow pipe 18 and enters the next conditioning coagulation sedimentation tank 2, and finally overflows to the supernatant buffer tank 4. The supernatant buffer tank 4 is divided into the first buffer tank and the second buffer tank. The supernatant water overflowing from the three-stage conditioning coagulation sedimentation tank 3 can only be discharged to the first buffer tank and the second buffer tank, which is controlled by the valve 19.

[0027] Preferably, when the water quality of the first buffer pool and the second buffer pool reaches the pretreatment target, the valve 19 on the first buffer pool or the second buffer pool is opened, and the water is pumped out along the outlet pipe 21 by the pump 43 to the outlet, and then discharged to the next sewage treatment process unit. Preferably, when the water quality of the first buffer pool and the second buffer pool does not reach the pretreatment target, the valve 19 on the first buffer pool or the second buffer pool is closed, and the substandard water is pumped by the pump 21 through the outlet pipe 21 to the inlet pipe 5, and then a round of multi-stage conditioning + coagulation + sedimentation pretreatment is carried out, and then the supernatant water is discharged to another empty supernatant buffer pool 4.

[0028] This embodiment takes a three-stage tempering coagulation sedimentation tank as an example to illustrate the technical solution of the present invention. The supernatant water of the first-stage tempering coagulation sedimentation tank 1 overflows into the coagulation and stirring zone D of the second-stage tempering coagulation sedimentation tank 2, and the supernatant water of the second-stage tempering coagulation sedimentation tank 2 overflows into the coagulation and stirring zone D of the tertiary tempering coagulation sedimentation tank 3. These processes are water level drop and gravity flow, and no energy-consuming pumping is required.

[0029] The present invention can realize multi-stage efficient conditioning + coagulation + sedimentation pretreatment of the coagulation sedimentation supernatant on a modular set of devices. The whole equipment is integrated and easy to move. The sedimentation of each conditioning coagulation sedimentation tank is concentrated on the conical tank bottom. Under the action of stirring and scraping mud, compaction sedimentation and clogging are prevented, which is conducive to mud cleaning.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A multi-stage high-efficiency coagulation and sedimentation integrated device, characterized in that: The invention comprises a multi-stage conditioning coagulation sedimentation tank and a plurality of supernatant buffer tanks (4) arranged along the water flow direction and step by step according to the water level line. The conditioning coagulation sedimentation tank comprises a coagulation stirring zone (D) at the inlet of the tank, a coagulation reaction and sedimentation zone (B) in the middle layer of the tank, a sedimentation aggregation zone (C) in the lower layer of the tank and a supernatant zone (A) in the upper layer of the tank. The water inlet of the coagulation stirring zone (D) is provided with a conditioning liquid inlet (6) and a static pipeline agitator (7). The coagulation stirring zone (D) is provided with a coagulant stirring motor (10), a coagulant inlet (11), a coagulant aid inlet (12) and a supernatant buffer tank (13) arranged on the coagulant stirring motor (14). 10) at the end of the agitator (8) of opposite directions with double blades, the upper side of the coagulation reaction and sedimentation zone (B) is provided with a micro-aeration unit (17) and an inclined plate / inclined tube sedimentation unit (16) in sequence, the sedimentation and aggregation zone (C) is provided with a mud scraping and stirring motor (14) and a mud scraping and stirring blade (15) arranged at the end of the mud scraping and stirring motor (14), the bottom of the sedimentation and aggregation zone (C) is provided with a mud discharge hole (20), the water surface of the upper clear zone (A) is provided with a suspended matter cleaner (13), the first stage of the conditioning coagulation sedimentation tank is provided with a water inlet pipe (5) connected to the inside, and the space between the adjacent two stages of conditioning coagulation sedimentation tanks and the conditioning coagulation sedimentation tank is provided with a water inlet pipe (5) connected to the inside. The coagulation and sedimentation tank is connected to the supernatant buffer tank (4) via an overflow pipe (18), the inlet and outlet of the supernatant buffer tank (4) are both provided with valves (19), the bottom of the supernatant buffer tank (4) is connected to the water inlet pipe (5) via an outlet pipe (21), the outlet pipe (21) is provided with a pump (22), the supernatant buffer tank (4) comprises a first buffer tank and a second buffer tank, the supernatant overflowing from the last stage of the conditioning coagulation and sedimentation tank enters the first buffer tank or the second buffer tank, and valves (19) are provided between the first buffer tank and the second buffer tank and the overflow pipe (18). ); when the water quality of the first buffer pool and the second buffer pool reaches the pretreatment target, the valve (19) on the first buffer pool or the second buffer pool is opened, and the water is pumped out along the outlet pipe (21) to the discharge port by the pumping pump (22); when the water quality of the first buffer pool and the second buffer pool does not reach the pretreatment target, the valve (19) on the first buffer pool or the second buffer pool is closed, and the substandard water is pumped by the pumping pump (22) through the outlet pipe (21) to the inlet pipe (5), and then a round of multi-stage conditioning + coagulation + sedimentation pretreatment is performed, and then the supernatant water is discharged to another empty supernatant buffer pool (4).

2. The multi-stage high-efficiency coagulation and sedimentation integrated device according to claim 1 is characterized in that: The lower port of the coagulant inlet (11) is located above the counter-rotating double-blade agitator (8), and the lower port of the coagulant aid inlet (12) is located in the middle of the double blades of the counter-rotating double-blade agitator (8).

3. The multi-stage high-efficiency coagulation and sedimentation integrated device according to claim 1 is characterized in that: A guide plate (9) is provided at the lower end of the coagulation and stirring zone (D).

4. The multi-stage high-efficiency coagulation and sedimentation integrated device according to claim 1 is characterized in that: The bottom of the sedimentation and gathering area (C) is arranged in a V shape, the radius of the scraper and stirring blade (15) decreases step by step from bottom to top, and the edge of the scraper and stirring blade (15) is close to the bottom edge of the sedimentation and gathering area (C).

5. The multi-stage high-efficiency coagulation and sedimentation integrated device according to claim 1 is characterized in that: The micro aeration unit (17) comprises an ABS plastic aeration head and an ABS plastic air pipe.

6. The multi-stage high-efficiency coagulation and sedimentation integrated device according to claim 1 is characterized in that: The inclined plate / inclined tube sedimentation unit (16) comprises a hexagonal honeycomb inclined plate and inclined tube filler and a filler support frame.

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