Coagulation precipitation tank capable of uniformly distributing water

Abstract

The coagulative precipitation tank capable of uniformly distributing water comprises a coagulation area, a water inlet pipe is connected to the side wall of the coagulation area, wastewater entering the water inlet pipe passes through the coagulation area and then enters a flocculation area, a first water outlet in the lower portion of the flocculation area is connected with the water inlet end of a uniform water distribution device, and a second water outlet in the lower portion of the flocculation area is connected with the water outlet end of the uniform water distribution device. The uniform water distribution device is fixed on the side wall of the settling zone, a second water outlet is formed in the upper end of the settling zone, the second water outlet is connected with a water outlet zone, and the lower end of the settling zone is connected with a sludge collection zone. The uniform water distribution device is arranged in the settling area, so that uniform water distribution is facilitated, the water distribution effect is ensured, sludge settling is accelerated, the treatment load of subsequent equipment is reduced, and the effluent quality is ensured to reach the standard.

Description

Technical Field

[0001] The utility model belongs to the technical field of oilfield coagulation sedimentation tanks, and particularly relates to a coagulation sedimentation tank capable of uniformly distributing water. Background Technique

[0002] At present, the main processes for treating pressure backflow liquid in the petroleum and petrochemical industries are "coagulation sedimentation - air flotation - filtration", etc. The purpose of coagulation sedimentation is to precipitate sediment and large particulate impurities in the measure waste liquid at the bottom of the coagulation stirring tank through physical methods, and at the same time achieve the purpose of homogenizing the incoming water, reducing the treatment load of subsequent equipment, and ensuring that the effluent quality meets the standards.

[0003] The main operation mode of the existing pressure backflow liquid coagulation stirring tank is as follows: after the sediment or large particulate impurities in the wastewater are adjusted for pH value and dosed with chemicals in the coagulation stirring tank, they are precipitated in the sedimentation area to achieve the purpose of pretreatment. However, after the existing coagulation sedimentation tank is used for a period of time, due to the relatively concentrated sedimentation area, sedimentation dead angles and short circuits are likely to form in the sedimentation tank, and a large amount of sediment fails to settle, resulting in unqualified effluent. Content of the Utility Model

[0004] The utility model aims to solve the problem of uneven water distribution existing in the existing coagulation sedimentation tank, and provides a coagulation sedimentation tank capable of uniformly distributing water.

[0005] A coagulation sedimentation tank capable of uniformly distributing water according to the utility model comprises a coagulation area, an inlet pipe is connected to the side wall of the coagulation area, the wastewater entering the inlet pipe enters the flocculation area after passing through the coagulation area, the inlet end of a uniform water distribution device is connected to the first water outlet at the lower part of the flocculation area, the uniform water distribution device is fixed on the side wall of the sedimentation area, a second water outlet is opened at the upper end of the sedimentation area, the second water outlet is connected to the water outlet area, and a sludge collection area is connected to the lower end of the sedimentation area.

[0006] Furthermore, the inlet pipe is located at the upper part of the coagulation area, the inlet pipe is a bent pipe structure with downward water outlet, and the height of the lowest end of the inlet pipe is higher than the liquid level height in the coagulation area.

[0007] Furthermore, a first chemical pipe and a second chemical pipe are respectively connected to the upper ends of the coagulation area and the flocculation area.

[0008] Furthermore, a first stirrer and a second stirrer are respectively fixed on the inner side wall surfaces at the upper ends of the coagulation area and the flocculation area, and the structures of the first stirrer and the second stirrer are the same.

[0009] Further, the first stirrer includes a driving mechanism located outside the top of the coagulation zone, and a first stirring blade extending into the coagulation zone and connected to the driving mechanism. The second stirrer includes a driving mechanism located outside the top of the flocculation zone, and a second stirring blade extending into the flocculation zone and connected to the driving mechanism.

[0010] Further, the uniform water distribution device has a window-shaped structure and is formed by connecting multiple hollow pipes. The hollow pipes arranged horizontally in the horizontal direction corresponding to the inlet to the outlet of the sedimentation zone are used as cross pipes, and the hollow pipes perpendicular to the cross pipes are used as vertical pipes. A plurality of water outlet holes are uniformly opened on each vertical pipe.

[0011] Further, the diameter of the cross pipe connected to the water inlet end of the uniform water distribution device is set to 150 mm, and the diameters of the remaining hollow pipes are set to 100 mm.

[0012] The diameter of the water outlet holes is set to 50 mm.

[0013] Further, an oil skimmer is fixed on the upper side wall of the sedimentation zone.

[0014] Further, one side of the sludge collection zone is connected to a sludge pump.

[0015] Further, a blowing device is also connected to the water inlet end of the uniform water distribution device.

[0016] The present utility model has the following advantages compared with the prior art:

[0017] 1. In the coagulation sedimentation tank of the present utility model, through the uniform water distribution device arranged in the sedimentation zone, the wastewater slowly flows from the bottom of the flocculation zone into the uniform water distribution device, the wastewater is evenly distributed and flows downward, and high-efficiency sedimentation is carried out in the sedimentation area. The water that has completed sedimentation enters the water outlet area. Moreover, the wastewater slowly flows into the sedimentation zone to ensure the integrity of the floccules.

[0018] 2. By setting the water inlet pipe into a bent pipe structure, and the height of the water inlet pipe is higher than the liquid level height. The water entering from the bent pipe can impact the bottom of the coagulation zone under the condition of water pump pressurization, bringing the sludge to the flocculation zone, so that there are fewer sludge dead corners in the coagulation zone.

[0019] 3. An oil skimmer is arranged at the upper part of the sedimentation zone of the present utility model, so that the waste oil floats on the water surface, and then is taken away by the scraper of the foam scraper to achieve an ideal water-oil separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings here are incorporated into the specification and form a part of this specification, and are used together with the specification to explain the principle of the present utility model.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is a schematic structural diagram of a coagulation sedimentation tank of the present invention;

[0023] Figure 2 is a schematic structural diagram of the uniform water distribution device in the present invention.

[0024] Among them: 1 - inlet pipe; 2 - first chemical agent pipe; 3 - first stirrer; 4 - coagulation zone; 5 - support rod; 6 - second stirrer; 7 - flocculation zone; 8 - sedimentation zone; 9 - oil skimmer; 10 - water outlet zone; 11 - sludge pump; 12 - sludge collection zone; 13 - uniform water distribution device; 131 - water inlet end; 132 - water outlet hole. Detailed implementation manners

[0025] The following will describe the implementation schemes of the present invention in detail in combination with the embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0026] The coagulation sedimentation tank of the present invention is a water treatment process integrating coagulation, flocculation, reaction, sedimentation, clarification technology and sludge thickening technology. The wastewater experiences the coagulation zone 4, flocculation zone 7, sedimentation zone 8 and water outlet zone 10 in the coagulation sedimentation tank successively. The wastewater flows into the coagulation zone 4, where the wastewater is coagulated and mixed with the added coagulant, and a reaction occurs between the coagulation chemical agent and the wastewater, causing the sludge in the wastewater to form flocs. The wastewater that has completed coagulation in the coagulation zone 4 flows into the flocculation zone 7 and is fully mixed with the flocculant, mainly to further increase the density of the alum flocs. Here, the flocculant is added by the dosing system, and slow stirring is carried out in this area. If fast stirring is carried out, the formed alum flocs will be broken, and if the speed is too slow, the formed alum flocs will precipitate in this area. The water outlet from the flocculation zone 7 enters the uniform water distribution device 13 at the bottom of the sedimentation zone 8. After uniform water distribution, the wastewater undergoes sedimentation separation in the sedimentation zone 8. After passing through the uniform water distribution device 13, the bottom sludge is more evenly distributed in the sludge collection zone 12. The dosing amounts of the coagulant and the flocculant are adjusted by magnifying according to the small test data values of the influent flow rate and the suspended solid content.

[0027] According to the embodiments of the present invention, in combination with the attached Figure 1-2As shown in the figure, a coagulation sedimentation tank capable of evenly distributing water according to the present utility model includes a coagulation zone 4, a flocculation zone 7, a sedimentation zone 8, a sludge collection zone 12, and an effluent zone 10. An inlet pipe 1 is connected to the upper part of the side wall of the coagulation zone 4. The wastewater entering the inlet pipe 1 sequentially passes through the coagulation reaction in the coagulation zone 4 and then enters the flocculation zone 7. After the flocculation reaction in the flocculation zone 7, it passes through the water inlet end 131 of a uniform water distribution device 13 extending into the lower part of the flocculation zone 7, and the wastewater is evenly and slowly flowed into the sedimentation zone 8. The uniform water distribution device 13 is fixed on the side wall of the sedimentation zone 8. A second water outlet is opened at the upper end of the sedimentation zone 8, and the second water outlet is connected to the effluent zone 10. The lower end of the sedimentation zone 8 is connected to the sludge collection zone 12.

[0028] According to an embodiment of the present utility model, the inlet pipe 1 is located in the upper part of the coagulation zone 4. The inlet pipe 1 is a bent pipe structure with the water outlet downward, and the height of the lowest end of the inlet pipe 1 is higher than the liquid level height in the coagulation zone 4. The pressure backflow liquid, that is, the wastewater, enters the coagulation zone 4 through the inlet pipe 1. The inlet pipe 1 is located in the upper part of the coagulation sedimentation tank. After entering, one elbow is downward to guide the water into the front coagulation zone 4. The inlet height of the inlet pipe 1 is higher than the liquid level height of the coagulation zone 4, and the inlet water can impact the bottom of the coagulation zone 4, bringing up the sludge into the flocculation zone 7, so that there is less sludge in the sludge dead angle of the coagulation zone 4.

[0029] According to an embodiment of the present utility model, a first chemical agent pipe 2 is fixedly connected to the upper end of the coagulation zone 4. A coagulant PAC is added to the first chemical agent pipe 2, and a first stirrer 3 is fixed on the inner side wall surface at the upper end of the coagulation zone 4. The first stirrer 3 includes a driving mechanism located outside the top of the coagulation zone 4 and a first stirring blade extending into the coagulation zone 4 and connected to the driving mechanism. The wastewater enters the coagulation zone 4. Under the rapid stirring of the first stirring blade, the wastewater and the coagulant PAC fully react to form flocs in a short time. The added return sludge can accelerate the growth of the flocs and increase the density of the flocs, thereby improving the flocculation effect and the sedimentation effect in the sedimentation zone 8.

[0030] According to an embodiment of the present utility model, a second chemical agent pipe 6 is fixedly connected to the upper end of the flocculation zone 7. A PAM flocculant is added to the second chemical agent pipe 6, and a second stirrer 5 is fixed on the inner side wall surface at the upper end of the flocculation zone 7. The second stirrer 5 includes a driving mechanism located outside the top of the flocculation zone 7 and a second stirring blade extending into the flocculation zone 7 and connected to the driving mechanism. The wastewater that has reacted in the coagulation zone 4 enters the flocculation zone 7, mainly to further increase the density of the flocs. Here, the PAM flocculant is added by the dosing system. Slow stirring is carried out in this area. If the rapid stirring will break the formed flocs, and if the speed is too slow, the formed flocs will precipitate in this area and then enter the sedimentation zone.

[0031] According to an embodiment of the present utility model, wastewater slowly flows from the bottom of the flocculation zone 7 to the bottom of the sedimentation zone 8. The wastewater in the flocculation zone 7 can only pass through the water inlet end 131 of the uniform water distribution device 13. After the wastewater passes through the uniform water distribution device 13, the wastewater is evenly distributed and then flows downward to reach the bottom of the sedimentation zone 8, where highly efficient sedimentation occurs in the sedimentation zone 8. The water that has completed sedimentation enters the water outlet zone 10, and the sedimented sludge settles in the lower sludge collection zone 12 of the sedimentation zone 8. The sedimentation zone 8 ensures slow flocculation required for the growth of alum flowers, and the generated alum flowers have a relatively high density. The water slowly flows to the sedimentation zone to ensure the integrity of the alum flowers. A skimmer 9 is fixed on the upper side wall of the sedimentation zone 8, which is connected to a driving structure to control the start, stop, and operation of the skimmer 9. When the oil floats on the water surface, the skimmer 9 is used to take away the oil, achieving an ideal water-oil separation effect.

[0032] According to an embodiment of the present utility model, in combination with the attached Figure 2 As shown, the uniform water distribution device 13 has a window-like structure and is formed by connecting multiple hollow tubes. The hollow tubes arranged horizontally in the horizontal direction corresponding to the water inlet to the water outlet of the sedimentation zone 8 are used as cross tubes, and the hollow tubes perpendicular to the cross tubes are used as vertical tubes. A plurality of water outlet holes 132 are evenly opened on each vertical tube. The diameter of the cross tube connected to the water inlet end 131 of the uniform water distribution device 13 is set to 150 mm, the diameter of the remaining hollow tubes is set to 100 mm, and the diameter of the water outlet holes 132 is set to 50 mm. In order to prevent the wastewater flowing into the sedimentation zone 8 through the uniform water distribution device 13 from possibly blocking the water outlet holes 132, a blowing device is also connected to the water inlet end 131 of the uniform water distribution device 13. Generally, since the wastewater flowing from the flocculation zone 7 into the sedimentation zone 8 arrives after slow flow, sufficient sedimentation time is given. Therefore, the water outlet holes 132 on the uniform water distribution device 13 will not be blocked. When the water outlet holes 132 are blocked, the blowing device can be used to unblock the water outlet holes 132.

[0033] According to an embodiment of the present utility model, the sedimented sludge settles in the lower sludge collection zone 12 of the sedimentation zone 8. When the amount of bottom sludge is too large, it belongs to surplus sludge, and it is pumped to the sludge storage tank by the sludge pump 11.

[0034] According to an embodiment of the present utility model, the water that has undergone reaction sedimentation and flows out from the second water outlet of the sedimentation zone 8 enters the water outlet zone 10 and exits through the bottom valve to enter the next unit.

[0035] The purpose of this utility model patent is to use a uniform water distribution device for the coagulation sedimentation tank, which helps to distribute water evenly, ensure the water distribution effect, and accelerate sludge sedimentation. It reduces the treatment load of subsequent equipment and ensures that the effluent water quality meets the standards. The design of this utility model is reasonable, the structure is simple, and the utilization rate is relatively high. It can meet different water volumes, is safe and simple to operate, has strong practicability, and is worthy of promotion.

[0036] In this utility model, unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this invention can be understood according to specific circumstances.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this utility model. In this specification, the schematic expressions of the above terms do not have to be directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

Claims

1. A coagulation sedimentation tank capable of evenly distributing water, characterized in that: The invention comprises a coagulation zone (4), a water inlet pipe (1) is connected to the side wall of the coagulation zone (4), wastewater entering the water inlet pipe (1) passes through the coagulation zone (4) and then enters the flocculation zone (7), a first water outlet at the lower part of the flocculation zone (7) is connected to the water inlet end (131) of a uniform water distribution device (13), the uniform water distribution device (13) is fixed on the side wall of the sedimentation zone (8), a second water outlet is opened at the upper end of the sedimentation zone (8), the second water outlet is connected to the water outlet zone (10), and the lower end of the sedimentation zone (8) is connected to the sludge collection zone (12).

2. The coagulation sedimentation tank capable of uniform water distribution according to claim 1, characterized in that: The water inlet pipe (1) is located at the upper part of the coagulation zone (4); the water inlet pipe (1) is a curved pipe structure with water outlet directed downward; the height of the lowermost end of the water inlet pipe (1) is higher than the liquid level in the coagulation zone (4).

3. The coagulation and sedimentation tank capable of uniform water distribution according to claim 1, characterized in that: A first reagent tube (2) and a second reagent tube (6) are respectively connected to the upper ends of the coagulation zone (4) and the flocculation zone (7).

4. The coagulation and sedimentation tank capable of uniform water distribution according to claim 1, characterized in that: A first agitator (3) and a second agitator (5) are respectively fixed on the inner wall surfaces of the upper ends of the coagulation zone (4) and the flocculation zone (7); the first agitator (3) and the second agitator (5) have the same structure.

5. The coagulation sedimentation tank capable of evenly distributing water according to claim 4, characterized in that: The first agitator (3) comprises a driving mechanism located outside the top of the coagulation zone (4), and a first agitating blade extending into the coagulation zone (4) and connected to the driving mechanism. The second agitator (5) comprises a driving mechanism located outside the top end of the flocculation zone (7), and a second agitating blade extending into the interior of the flocculation zone (7) and connected to the driving mechanism.

6. The coagulation and sedimentation tank capable of evenly distributing water according to claim 1, characterized in that: The uniform water distribution device (13) is a window-shaped structure, formed by connecting a plurality of hollow tubes, wherein the hollow tubes arranged in the horizontal direction corresponding to the water inlet to the water outlet of the sedimentation area (8) are used as horizontal tubes, and the hollow tubes perpendicular to the horizontal tubes are used as vertical tubes. A plurality of water outlet holes (132) are evenly arranged on each of the vertical pipes.

7. The coagulation and sedimentation tank capable of evenly distributing water according to claim 6, characterized in that: The diameter of the transverse pipe connected to the water inlet end (131) of the uniform water distribution device (13) is set to 150 mm, and the diameter of the remaining hollow pipes is set to 100 mm. The diameter of the water outlet hole (132) is set to 50 mm.

8. The coagulation and sedimentation tank capable of evenly distributing water according to claim 1, characterized in that: An oil scraper (9) is fixed on the upper side wall of the sedimentation zone (8).

9. The coagulation sedimentation tank capable of evenly distributing water according to claim 1, characterized in that: One side of the sludge collecting area (12) is connected to a sludge pump (11).

10. The coagulation and sedimentation tank capable of evenly distributing water according to claim 1, characterized in that: The water inlet end (131) of the uniform water distribution device (13) is also connected to an air blowing device.

Images