CN216584379U

CN216584379U - A waste water removes calcium equipment for papermaking waste water aerobic system

Info

Publication number: CN216584379U
Application number: CN202123382720.3U
Authority: CN
Inventors: 钟胜锋; 陈旭鹏; 许钧媛
Original assignee: Guangzhou Chinaever Environmental Engineering Co ltd
Current assignee: Guangzhou Chinaever Environmental Engineering Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-05-24
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a waste water decalcification equipment for papermaking waste water aerobic system, which comprises a desander cylinder, wherein one side of the desander cylinder is provided with a water inlet, the water inlet is connected with a water inlet pipe, the other side of the desander cylinder is provided with only an outlet, and the outlet is connected with an outlet pipe; a central barrel is fixedly connected to the inner top of the sand remover barrel, a stirrer is arranged in the central barrel, the top of the stirrer is connected with the inner top of the sand remover barrel, an inner water outlet is arranged on one side of the central barrel, the inner water outlet is connected with one end of an inner water outlet pipe, and the other end of the inner water outlet pipe is hermetically connected with the outer water outlet; the bottom of the sand remover barrel is connected with a sand collecting device. The utility model is used for desorption papermaking waste water aerobic system's high content calcium ion for go out water stable in quality of water, the reliability is high, can effectively prevent the pipeline scale deposit behind the aerobic system and block up.

Description

Waste water calcium removal equipment for papermaking waste water aerobic system

Technical Field

The utility model relates to a water treatment technical field, concretely relates to waste water decalcification equipment for papermaking waste water aerobic system.

Background

In the production process of pulping and papermaking, the waste paper raw materials and the processes of coating, filling and the like of papermaking contain or use a large amount of calcium carbonate, so the calcium carbonate is widely present in the pulping and papermaking waste water. Due to the action of microorganisms, organic matters in the waste water are easily converted into volatile fatty acid and other substances, the volatile fatty acid and the like react with calcium carbonate, so that calcium is converted into an ionic state from a precipitation state, and calcium ions enter the papermaking waste water along with waste paper. With the increasing utilization rate of domestic waste paper recycling, the calcium ion concentration in the paper-making waste water also becomes higher.

The calcium ion concentration in the paper-making wastewater is high, the scaling of a water pipeline is easily caused, the calcification of an activated sludge aerobic aeration system and the scale deposition on the surface of an aerator are also caused, so that the aeration effect of an aerobic tank is deteriorated, the dissolved oxygen content is reduced, and the biochemical treatment capability is reduced. Particularly, after the aerobic system is aerated by air blast, carbon dioxide in the air reacts with calcium ions in water to generate calcium carbonate, so that subsequent treatment equipment and pipelines are easy to scale, and the pipelines are blocked. Therefore, aiming at the problem of serious calcification of the papermaking wastewater aerobic aeration system, the wastewater calcium removal system for the papermaking wastewater aerobic system is provided efficiently and stably, and is necessary for ensuring the normal operation of the papermaking wastewater treatment system.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims at providing a waste water calcium removing device for a papermaking waste water aerobic system.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the waste water calcium removal equipment for the papermaking waste water aerobic system comprises a desander barrel, wherein a water inlet is formed in one side of the desander barrel and is connected with a water inlet pipe, only an outer water outlet is formed in the other side of the desander barrel and is connected with an outer water outlet pipe; a central barrel is fixedly connected to the inner top of the sand remover barrel, a stirrer is arranged in the central barrel, the top of the stirrer is connected with the inner top of the sand remover barrel, an inner water outlet is arranged on one side of the central barrel, the inner water outlet is connected with one end of an inner water outlet pipe, and the other end of the inner water outlet pipe is hermetically connected with the outer water outlet; the bottom of the sand remover barrel is connected with a sand collecting device.

Furthermore, be provided with pressure transmitter I on the inlet tube, be provided with pressure transmitter II on going out the water pipe.

Further, the agitator includes the puddler, the puddler top is connected with gear motor, the puddler bottom is connected with the stirring rake, the stirring rake is arranged in center bobbin base portion below just is arranged in desander barrel body bottom top.

Furthermore, the sand collecting device comprises a sand collecting barrel, an upper opening of the sand collecting barrel is connected with the bottom of the barrel body of the desander, a sand discharging opening is formed in one side of the bottom of the sand collecting barrel and is connected with a sand discharging pipe.

Furthermore, a pneumatic valve I is arranged on the sand discharge pipe.

Further, the outlet of the sand discharge pipe is connected to a sand collecting pool.

Furthermore, the sand collecting cylinder penetrates through a power water pipe, and a water outlet of the power water pipe is close to the inner side of the sand discharge port.

Furthermore, a pneumatic valve II is arranged on the power water pipe and is positioned on the outer side of the sand collecting barrel.

Furthermore, the water inlet end of the water inlet pipe is connected with the water outlet of a sludge reflux pump of a secondary sedimentation tank in the papermaking wastewater aerobic system.

Furthermore, the water outlet end of the water outlet pipe is connected with an aerobic tank in the papermaking wastewater aerobic system.

The beneficial effects of the utility model reside in that:

1. the utility model provides an equipment of papermaking waste water aerobic system waste water decalcification can effectively reduce the calcium ion content of papermaking waste water aerobic system waste water, reduces the risk of aeration systems and good oxygen pond outlet conduit scale deposit, ensures good oxygen system steady operation. Through engineering verification: after the calcium removal equipment provided by the patent is arranged in the sludge return system of the secondary sedimentation tank and the aerobic tank, the calcium ion concentration of returned sludge is reduced to 270mg/L from 350mg/L, and the cleaning frequency of the aeration system of the aerobic tank is reduced to 240-300 days from 60 days.

2. The utility model discloses set up a center section of thick bamboo in the desander barrel for waste water makes less granule calcium deposit the collision more easily inside central section of thick bamboo of getting into from center section of thick bamboo inner wall tangential direction under the effect of agitator forms the large granule, makes heavier calcium-containing precipitate rotatory sink to a sand collection section of thick bamboo under the effect of high-speed centrifugal force in, has reduced the dwell time of waste water in the calcium removal equipment, has reduced the size of equipment simultaneously.

3. The utility model discloses be provided with pressure transmitter respectively at inlet tube and the water pipe of going out, detect the start-up that business turn over water piping pressure differential controlled pneumatic valve through pressure transmitter, and then realize monitoring sand discharge time, confirm the sand discharge time point, sand discharge convenient operation has improved the automaticity of system, has reduced the operation degree of difficulty. An auxiliary power water pipe is arranged in the sand collecting cylinder, and flushing is controlled through a pneumatic valve, so that sand setting blockage is prevented.

4. The utility model discloses utilize gravity sand setting, avoided air stripping sand removal device or pump suction sand removal device, have advantages such as compact structure, area are little. The system can be used for the reconstruction project of the papermaking wastewater aerobic system, and the original project facilities are fully utilized, so the reconstruction is simple and convenient, and the reconstruction cost is low.

To sum up, the utility model is used for desorption papermaking waste water aerobic system's high content calcium ion for go out water stable in quality of water, the reliability is high, can effectively prevent the pipeline scale deposit behind the aerobic system and block up.

Drawings

FIG. 1 is a schematic diagram of the process flow of the aerobic system for papermaking wastewater of the utility model;

FIG. 2 is a schematic diagram of the whole structure of the wastewater calcium removal equipment of the papermaking wastewater aerobic system of the utility model.

Reference numerals: 1. a water inlet pipe; 2. a pressure transmitter I; 3. a central barrel; 4. a stirring rod; 5. a reduction motor; 6. a desander barrel; 7. a sand collection cylinder; 8. an outlet water pipe; 9. a pressure transmitter II; 10. a sand discharge pipe; 11. a pneumatic valve I; 12. a power water pipe; 13. a pneumatic valve II; 14. a water inlet; 15. an inner water outlet; 16. an inner water outlet pipe; 17. and (4) an outlet water port.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments:

as shown in figure 1, the aerobic system for papermaking wastewater of the utility model comprises an aerobic tank, a secondary sedimentation area, a calcium removal device and a sand collection tank.

The papermaking wastewater aerobic system is one part of a papermaking wastewater treatment system and is used for converting organic matters in wastewater into inorganic matters. The wastewater firstly enters the aerobic tank and then enters the secondary sedimentation tank, and further enters the calcium removal equipment through the sludge reflux pump, the return sludge after calcium removal flows back to the aerobic tank again, and the heavy sludge containing large-particle calcium carbonate discharged by the calcium removal equipment is discharged into the sand collection tank. In the aerobic tank, after the wastewater and the sludge are mixed and blown by an aeration fan for aeration, carbon dioxide in the air is dissolved in water and reacts with calcium ions in the water to generate tiny calcium carbonate particles. After the violent air leaving the aerobic tank is stirred, the tiny calcium carbonate particles in the stable water body collide with water flow and are polymerized into large calcium carbonate particles, and the large calcium carbonate particles enter a secondary sedimentation tank. And connecting a water outlet of a sludge reflux pump of the secondary sedimentation tank with a calcium removal device, and enabling high-concentration reflux sludge containing large-particle calcium carbonate to enter the calcium removal device. The large-particle calcium carbonate with heavier mass is separated from the returned sludge under the centrifugal action force of the calcium removal equipment, the returned sludge after calcium removal returns to the front end of the aerobic tank, the purpose of removing calcium from the wastewater of the aerobic system is realized, and the content of calcium ions in the wastewater of the aerobic system is greatly reduced.

Particularly, the flow velocity of high-concentration return sludge (MLSS is 8-10 g/L) in the secondary sedimentation tank when entering the calcium removal equipment is 1.5m/s, and the retention time of wastewater in the calcium removal equipment is 30 s.

A waste water calcium removing device for a papermaking waste water aerobic system is shown in figure 2 and comprises a sand remover cylinder 6, wherein a water inlet 14 is formed in one side of the sand remover cylinder 6, the water inlet 14 is connected with a water inlet pipe 1, only an outer water outlet 17 is formed in the other side of the sand remover cylinder 6, and the outer water outlet 17 is connected with an outer water outlet pipe 8; a central barrel 3 is fixedly connected to the inner top of the sand remover barrel 6, a stirrer is arranged in the central barrel 3, the top of the stirrer is connected with the inner top of the sand remover barrel 6, an inner water outlet 15 is arranged on one side of the central barrel 3, the inner water outlet 15 is connected with one end of an inner water outlet pipe 16, and the other end of the inner water outlet pipe 16 is hermetically connected with an outer water outlet 17; the bottom of the sand remover cylinder 6 is connected with a sand collecting device.

Furthermore, a pressure transmitter I2 is arranged on the water inlet pipe 1, and a pressure transmitter II 9 is arranged on the water outlet pipe 8. The pressure difference between the water inlet pipe 1 and the water outlet pipe 8 is detected through the pressure transmitter I2 and the pressure transmitter II 9.

Further, the agitator is vertical agitator, and the agitator includes puddler 4, and 4 tops of puddler are connected with gear motor 5, and 4 bottoms of puddler are connected with the stirring rake, and the stirring rake is arranged in 3 bottoms below in the center section of thick bamboo and is arranged in 6 bottoms tops of desander barrel.

Further, the sand collecting device comprises a sand collecting cylinder 7, an upper opening of the sand collecting cylinder 7 is connected with the bottom of the sand remover cylinder body 6, a sand discharging opening is formed in one side of the bottom of the sand collecting cylinder 7, and the sand discharging opening is connected with a sand discharging pipe 10.

Further, a pneumatic valve I11 is arranged on the sand discharge pipe 10.

Further, the outlet of the sand drain 10 is connected to a sand trap.

Furthermore, the sand collecting cylinder 7 is penetrated by a power water pipe 12, and the water outlet of the power water pipe 12 is close to the inner side of the sand discharging port.

Further, an air-operated valve II 13 is arranged on the power water pipe 12, and the air-operated valve II 13 is positioned outside the sand collecting barrel 7.

Furthermore, the water inlet end of the water inlet pipe 1 is connected with the water outlet of a sludge reflux pump of a secondary sedimentation tank in the papermaking wastewater aerobic system.

Further, the water outlet end of the water outlet pipe 8 is connected with a sludge backflow point at the front end of an aerobic tank in the papermaking wastewater aerobic system.

The method for removing calcium by using the waste water calcium removing equipment of the utility model comprises the following steps:

firstly, closing a pneumatic valve I11 on a sand discharge pipe and a pneumatic valve II 13 on a power water pipe 12; the effluent of the secondary sedimentation tank sludge reflux pump enters the center barrel 6 of the barrel body of the desander along the tangential direction of the inner wall of the center barrel 6 through the water inlet pipe 1, and the water flow forms rotational flow under the driving of the rotation of the stirring paddle in the stirrer to generate centrifugal force. In the center of the sand remover cylinder 6, the vertical mixer 4 controls the flow velocity of water flow to roll and clean heavy sludge containing large-particle calcium carbonate and activated sludge carrying a large amount of adhered organic matters for many times. Under the action of rotational flow, water flow continuously rolls upwards and enters the central cylinder 3, muddy water collides with the cylinder wall to dissipate energy, and activated sludge with low density and light weight is separated from heavy sludge containing large-particle calcium carbonate under the action of turbulent flow and mechanical collision of the water flow. Heavy sludge containing large-particle calcium carbonate sinks towards a sand collecting cylinder 7 at the lower part of a sand remover cylinder body 6, and activated sludge carrying a large amount of adhered organic matters continuously upwards swirls along with water flow and flows back to the front end of the aerobic tank through an inner water outlet pipe 16 and an outer water outlet pipe 8.

When the deposition amount of the heavy sludge containing the large-particle calcium carbonate in the sand collection cylinder 7 reaches the design load, the heavy sludge containing the large-particle calcium carbonate enters the water outlet pipe 8, the pipeline pressure of the water outlet pipe 8 is increased, a pipeline pressure difference exists between the water inlet pipe 11 and the water outlet pipe 8, at this time, the pneumatic valve I11 on the sand discharge pipe 10 and the pneumatic valve II 13 on the power water pipe 12 are opened, and the heavy sludge containing the large-particle calcium carbonate accumulated in the sand collection cylinder 7 is discharged to a sand collection pool through the sand discharge pipe 10 under the flushing of power water from the power water pipe. The water inlet pipe 1 does not stop water inlet in the sand discharging process, when the pressure difference between the water inlet pipe 1 and the water outlet pipe 8 recovers to be normal, the pneumatic valve I11 on the sand discharging pipe 10 and the pneumatic valve II 13 on the power water pipe 12 are closed, and the steps are continuously circulated.

The control of the pneumatic valve I11 on the sand drain pipe 10 and the pneumatic valve II 13 on the power water pipe 12 by acquiring the pipe pressure difference between the water inlet pipe 1 and the water outlet pipe 8 is the prior art and will not be described in detail herein.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims

1. The waste water calcium removal equipment for the papermaking waste water aerobic system is characterized by comprising a sand remover barrel (6), wherein a water inlet (14) is formed in one side of the sand remover barrel (6), the water inlet (14) is connected with a water inlet pipe (1), only an outlet water port (17) is formed in the other side of the sand remover barrel (6), and the outlet water port (17) is connected with an outlet water pipe (8); the inner top of the sand remover barrel body (6) is fixedly connected with a central barrel (3), a stirrer is arranged in the central barrel (3), the top of the stirrer is connected with the inner top of the sand remover barrel body (6), an inner water outlet (15) is arranged on one side of the central barrel (3), the inner water outlet (15) is connected with one end of an inner water outlet pipe (16), and the other end of the inner water outlet pipe (16) is hermetically connected with the outer water outlet (17); the bottom of the sand remover cylinder (6) is connected with a sand collecting device.

2. The waste water calcium removing device for the papermaking waste water aerobic system according to the claim 1, characterized in that the water inlet pipe (1) is provided with a pressure transmitter I (2), and the water outlet pipe (8) is provided with a pressure transmitter II (9).

3. The waste water calcium removal device for the papermaking waste water aerobic system according to the claim 1, characterized in that the stirrer comprises a stirring rod (4), the top of the stirring rod (4) is connected with a speed reducing motor (5), the bottom of the stirring rod (4) is connected with a stirring paddle, and the stirring paddle is arranged below the bottom of the central cylinder (3) and above the bottom of the desander cylinder (6).

4. The waste water calcium removing device for the papermaking waste water aerobic system according to the claim 1, characterized in that the sand collecting device comprises a sand collecting cylinder (7), the upper opening of the sand collecting cylinder (7) is connected with the bottom of the sand remover cylinder (6), one side of the bottom of the sand collecting cylinder (7) is provided with a sand outlet, and the sand outlet is connected with a sand discharging pipe (10).

5. The wastewater calcium removal device for the papermaking wastewater aerobic system according to the claim 4, characterized in that the sand discharge pipe (10) is provided with a pneumatic valve I (11).

6. The wastewater calcium removal equipment for the papermaking wastewater aerobic system according to the claim 4, characterized in that the outlet of the sand drain pipe (10) is connected to a sand catch basin.

7. The waste water calcium removing device for the papermaking waste water aerobic system according to the claim 4, characterized in that the sand collecting cylinder (7) is penetrated with a power water pipe (12), and the water outlet of the power water pipe (12) is near the inner side of the sand discharging port.

8. The waste water calcium removing device for the papermaking waste water aerobic system as claimed in claim 7, characterized in that the power water pipe (12) is provided with a pneumatic valve II (13), and the pneumatic valve II (13) is positioned outside the sand collecting barrel (7).

9. The waste water calcium removal device for the papermaking waste water aerobic system as claimed in claim 1, wherein the water inlet end of the water inlet pipe (1) is connected with the water outlet of the sludge reflux pump of the secondary sedimentation tank in the papermaking waste water aerobic system.

10. The waste water calcium removal device for the papermaking waste water aerobic system as claimed in claim 1, wherein the water outlet end of the water outlet pipe (8) is connected with the aerobic tank in the papermaking waste water aerobic system.