High-density pool

Abstract

The utility model provides a high-density pool, which comprises a reaction pool, a coagulation pool, a flocculation pool and an inclined tube sedimentation pool which are arranged in sequence, the reaction pool, the coagulation pool and the flocculation pool share a pool bottom, the pool bottom is higher than the bottom of the inclined tube sedimentation pool, no communication pipeline is arranged among the reaction pool, the coagulation pool, the flocculation pool and the inclined tube sedimentation pool, and two adjacent pools share a side wall. When the high-density pool is used for treating the desulfurization wastewater of the power plant, the problems that calcium sulfate blocks a communicating pipe of the high-density pool, water passing of the high-density pool is unsmooth, and a pipeline scale layer needs to be cleaned regularly can be solved, the maintenance period of the device can be prolonged, and the sewage treatment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field, especially a kind of high-density pool to avoid calcium sulfate scale formation blockage. BACKGROUND

[0002] When treating power plant desulfurization wastewater, calcium needs to be removed, in order to save operating cost, generally, sodium sulfate is added to high-density pool to form calcium sulfate precipitation to remove calcium first. The reaction pool, coagulation tank and flocculation tank of the existing high-density system are mainly connected by pipeline. When adopting pipeline connection, scale layer is easily formed on the pipe wall and elbow, which can block the pipeline. Since calcium sulfate crystal is fine and fragmented, it is easy to adhere to the pipe wall to form scale layer, which can block the communication pipe in the high-density pool, resulting in poor water flow in the high-density pool. Therefore, the pipeline scale layer must be cleaned regularly, which is extremely inconvenient to operate. SUMMARY

[0003] In order to solve the above problems existing in the prior art, the utility model provides a kind of high-density pool, including the reaction pool, coagulation tank, flocculation tank and inclined-tube sedimentation tank arranged in sequence, wherein the reaction pool, coagulation tank and flocculation tank share a pool bottom, the pool bottom is higher than the bottom of the inclined-tube sedimentation tank, and no communication pipeline is arranged between the reaction pool, coagulation tank, flocculation tank and inclined-tube sedimentation tank, and a side wall is shared between two adjacent pools.

[0004] The shared side wall is arranged by the following two optional ways:

[0005] Way 1: the bottom end of the shared side wall is arranged on the pool bottom, and the top end is lower than the highest water level line.

[0006] Way 2: the top end of the shared side wall is located at the highest water level line, and the bottom end is higher than the pool bottom, and a hole for communication is formed between the bottom end of the shared side wall and the pool bottom.

[0007] The shared side wall between the flocculation tank and the inclined-tube sedimentation tank is arranged by way 1.

[0008] In the utility model, the reaction pool, coagulation tank, flocculation tank and inclined-tube sedimentation tank share a side wall between two adjacent pools. The common side wall is usually square because the common reaction pool, coagulation tank, flocculation tank and inclined-tube sedimentation tank are usually cubic. Of course, the shape of the reaction pool, coagulation tank, flocculation tank and inclined-tube sedimentation tank is not limited, as long as the corresponding process flow can be completed and the required process target can be achieved. The shape of the shared side wall is also not limited, as long as the sewage can be treated in the reaction pool, coagulation tank, flocculation tank and inclined-tube sedimentation tank in sequence. When the shared side wall is arranged by way 1, the sewage flowing out of one pool enters the next pool through the upper part of the shared side wall, and when it is arranged by way 2, the sewage flowing out of one pool enters the next pool through the hole between the shared side wall and the pool bottom.

[0009] Preferably, the bottom of the pool is 1000-3000 mm higher than the bottom of the inclined tube sedimentation tank, and more preferably 1500-2500 mm higher.

[0010] As an embodiment, the shared side wall is arranged in Mode 1, and the top end of the shared side wall is 200-300 mm lower than the highest water level. The distance between the top end and the highest water level should not be too small to ensure the safe operation of the process.

[0011] As another embodiment, the shared side wall between the reaction pool and the coagulation pool and the shared side wall between the coagulation pool and the flocculation pool are arranged in Mode 2, and the bottom end of the shared side wall is 100-300 mm higher than the bottom of the pool.

[0012] Preferably, the bottom of the pool is 1000-3000 mm higher than the bottom of the inclined tube sedimentation tank.

[0013] The existing high-density pool is blocked by calcium sulfate scaling due to the following reasons: uneven mixing of reaction reagents, too short reaction time, resulting in insufficient reaction of added sodium sulfate with calcium ions in the wastewater, and continued reaction of water flowing out of the reaction pool to form calcium sulfate, forming a scale layer to block the pipeline.

[0014] Therefore, preferably, a water inlet for introducing water flow is arranged on one side wall of the reaction pool, and a partition is arranged in the reaction pool, the top end of the partition is at the same horizontal position as the top of the reaction pool, the bottom end of the partition is 100-300 mm higher than the bottom of the pool, and the horizontal distance between the partition and the water inlet is 100-500 mm.

[0015] More preferably, a dosing area is formed between the partition and the side wall of the reaction pool where the water inlet is arranged, and a mixing area is formed between the partition and the shared side wall of the reaction pool and the coagulation pool, wherein a dosing pipe is arranged in the dosing area.

[0016] More preferably, a high-efficiency axial flow mixer is arranged in the mixing area. The edge line speed of the high-efficiency axial flow mixer is 3-4 m / s.

[0017] The type of mixer for the reaction pool and the position of the dosing pipe are improved to improve the mixing reaction effect of sodium sulfate and calcium ions in the wastewater in the high-density pool, so that the reaction is sufficient and a scale layer is not formed in the rear end.

[0018] Preferably, a plurality of baffles are arranged in the flocculation pool, and the baffles are arranged in the following two optional modes:

[0019] Mode 3: The bottom end of the baffle is arranged on the bottom of the pool, and the top end is 100-300 mm lower than the highest water level;

[0020] Mode 4: The top end of the baffle is located at the highest water level, and the bottom end is 100-300 mm higher than the bottom of the pool, and a hole for communication is formed between the bottom end and the bottom of the pool;

[0021] The baffle plates are alternatively arranged in mode 3 and mode 4;

[0022] Optionally, a flow guide plate is arranged between the bottom of the flocculation tank and the shared side wall of the flocculation tank and the inclined tube sedimentation tank.

[0023] Preferably, the baffle plates are also arranged in the reaction tank and / or the coagulation tank, and the baffle plates are arranged in mode 3 or mode 4.

[0024] Specifically, when there is only one baffle plate in a tank, the baffle plate is optionally arranged in mode 3 or mode 4, and when there are multiple baffle plates in the tank, the baffle plates are alternatively arranged in mode 3 and mode 4, which can prolong the flow path of the sewage during use.

[0025] Preferably, the shared side wall arranged in mode 1 is arranged between the reaction tank and the coagulation tank, and the shared side wall arranged in mode 2 is arranged between the coagulation tank and the flocculation tank.

[0026] Preferably, a sludge return pipe is arranged in the coagulation tank. After the sludge return pipe is improved, the formed calcium sulfate can be adsorbed to form sludge flocs, so that the adhesion amount on the tank wall and the inclined tube is minimized.

[0027] The high-density tank of the utility model cancels the pipeline in the traditional high-density tank, and the shared side wall and the hole are connected between the adjacent two tanks. The high-density tank of the utility model can solve the problem that the calcium sulfate blocks the communication pipe of the high-density tank, causes the water flow of the high-density tank to be poor, and the pipe scale layer must be cleaned regularly, can prolong the device maintenance period, and improves the sewage treatment efficiency. In addition, a partition plate can be additionally arranged in the reaction tank, so that the reaction between the reagent and the sewage is more sufficient, a baffle plate can be additionally arranged in each tank, the movement path of the sewage is prolonged, the purification is ensured to be sufficient, and a sludge return pipe can be additionally arranged in the coagulation tank, so that the scaling risk in the subsequent sewage treatment process is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The structure schematic view of the high-density tank in the utility model is shown.

[0029] Reference signs:

[0030] 0. Highest water level line;

[0031] 1. Reaction tank;

[0032] 1-1. Axial flow agitator;

[0033] 1-2. Partition plate;

[0034] 1-3. Reagent adding area;

[0035] 1-4. Reagent adding pipe;

[0036] 1-5. Inlet pipe;

[0037] 1-6. Common side wall between the reaction tank and the coagulation tank;

[0038] 2. Coagulation tank;

[0039] 2-1. Agitator;

[0040] 2-2. Common side wall between the coagulation tank and the flocculation tank;

[0041] 2-3. Sludge return pipe;

[0042] 3. Flocculation tank;

[0043] 3-1. Baffle;

[0044] 3-2. Baffle;

[0045] 4. Inclined tube sedimentation tank;

[0046] 4-1. Inlet region;

[0047] 4-2. Inclined tube region. DETAILED DESCRIPTION

[0048] The above description merely illustrates the principles of the application. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described or shown herein, embody the principles of the application and are thus within its spirit and scope. Furthermore, there are several variations to the embodiments discussed above, and it is intended that all such variations be considered within the scope of the application. All such modifications and variations are believed to fall within the scope of the application as expressed in the appended claims. The description of the embodiments of the application is merely exemplary in nature and, thus, does not limit the scope of the application. It is contemplated that, in these respects, cover alternatives that fall within the spirit and scope of the application. What is claimed is:

[0049] It should be noted that in this specification and in the claims, like numbers refer to like items throughout. Therefore, where a particular item is introduced in one figure, it is understood that additional figures can include similar items that are not necessarily labeled.

[0050] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0051] In the description of the present embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0052] In order to make the purpose, technical scheme and advantages of the utility model more clear, the embodiments of the utility model will be further described in detail below with reference to the drawings.

[0053] Reference Figure 1 , Figure 1 is a structural schematic view of a high-density sedimentation tank adopted in an embodiment of the utility model, comprising a reaction tank 1, a coagulation tank 2, a flocculation tank 3 and an inclined tube sedimentation tank 4 arranged in sequence. The reaction tank 1, the coagulation tank 2 and the flocculation tank 3 share a tank bottom, and the tank bottom is 1500mm higher than the bottom of the inclined tube sedimentation tank 4.

[0054] The water inlet is arranged on the side wall opposite to the side wall shared by the reaction tank 1 and the coagulation tank 2, and the water inlet is provided with a water inlet pipe 1-5. When the desulfurization wastewater is treated by the sedimentation tank, the sewage enters the reaction tank 1 through the water inlet pipe 1-5. A partition plate 1-2 is arranged in the reaction tank 1, the top end of the partition plate is at the same horizontal position as the top of the reaction tank, the bottom end of the partition plate is 200 mm higher than the bottom of the tank, and the horizontal distance between the partition plate and the water inlet is 300 mm. The partition plate and the two side walls of the reaction tank form a dosing area 1-3 and a mixing area, respectively, the dosing area 1-3 is provided with a dosing pipe 1-4 for adding sodium sulfate into the reaction tank. Due to the small horizontal distance between the partition plate and the water inlet, a relatively narrow dosing area is formed, and the water flow is stirred violently, so that the medicament and the sewage are uniformly mixed. The sewage enters the mixing area through the hole between the partition plate and the bottom of the tank, and the mixing area is provided with a high-efficiency axial flow agitator, and the edge line speed of the high-efficiency axial flow agitator can reach 3-4 m / s, which further makes the sodium sulfate and the calcium ions in the sewage fully mix and react, so that the scale layer is avoided to continue to react in the rear end. After the sewage flows out of the mixing area, it enters the coagulation tank 2 through the top of the shared side wall 1-6 of the reaction tank 1 and the coagulation tank 2. The top end of the shared side wall 1-6 is 250 mm away from the highest water level line.

[0055] The coagulation tank 2 is provided with an agitator 2-1 and a sludge backflow pipe 2-3. After the sludge backflow, the formed calcium sulfate is adsorbed to form sludge flocs, so that the adhesion amount on the wall and the inclined pipe is minimized, and the agitator is used to ensure sufficient reaction. Subsequently, the sewage enters the flocculation tank 3 from the lower hole of the shared side wall 2-2 between the coagulation tank and the flocculation tank. The distance between the shared side wall 2-2 and the bottom of the tank is 150 mm.

[0056] The flocculation tank 3 is provided with an agitator and two baffles (3-1, 3-2), the baffle 3-1 is arranged on the bottom of the tank, and the top end is 300 mm away from the highest water level line; the top end of the baffle 3-2 is at the same horizontal position as the top of the flocculation tank 3, and the bottom end of the baffle 3-2 is 300 mm higher than the bottom of the tank. After the sewage is stirred, it first passes through the top end of the baffle 3-1 and then flows out from the hole between the baffle 3-2 and the bottom of the tank. The baffle 3-2 and the shared side wall between the flocculation tank 3 and the inclined pipe sedimentation tank 4 are provided with a flow guide plate. The sewage flowing out of the hole is upwardly moved by the flow guide plate and then flows into the inclined pipe sedimentation tank 4 from above the shared side wall between the flocculation tank 3 and the inclined pipe sedimentation tank 4. The shared side wall between the flocculation tank 3 and the inclined pipe sedimentation tank 4 is 300 mm away from the highest water level line. Of course, in other embodiments of the present application, more than three partition plates can be arranged in the flocculation tank, and the arrangement mode of the baffles 3-1 and 3-2 is alternately used, so that the flow path of the sewage can be prolonged.

[0057] The inclined tube sedimentation tank 4 comprises a water inlet area 4-1 and an inclined tube area 4-2. A large number of inclined tubes or inclined plates are arranged in the inclined tube area 4-2, so that the insoluble impurities (mainly calcium sulfate) suspended in the sewage are precipitated, thereby improving the sewage purification efficiency. The sludge generated in the inclined tube area 4-2 enters the coagulation tank 2 through a sludge return pipe, and helps to adsorb the insoluble precipitates in the sewage.

[0058] The high-density pool of the utility model can remove calcium hardness in sewage, and can significantly reduce the risk of calcium scale blockage of the pipeline. In particular, compared with the high-density pool using a communication pipe with the same curvature radius and diameter as the vertical section or the horizontal section, the maintenance cycle of the high-density pool can be prolonged by more than 1 times, and the sewage treatment efficiency can be significantly improved.

[0059] The high-density pool of the utility model can treat desulfurization wastewater, can significantly alleviate the problem of frequent maintenance of the device caused by sewage scaling, can prolong the device maintenance period, and can improve the sewage treatment efficiency. In addition, the reaction between the reagent and the sewage can be more sufficient by additionally arranging a partition plate in the reaction tank, the movement path of the sewage can be prolonged by additionally arranging a baffle plate in each pool, the purification can be ensured to be sufficient, and the scaling risk in the subsequent sewage treatment process can be further reduced by additionally arranging a sludge return pipe in the coagulation tank.

[0060] Although the utility model has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood that the above description is further detailed description of the utility model in combination with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making a number of simple inferences or substitutions, without departing from the spirit and scope of the utility model.

Claims

1. A high-density tank comprising a reaction tank, a coagulation tank, a flocculation tank and an inclined tube sedimentation tank which are arranged in this order, characterized in that, The reaction tank, coagulation tank and flocculation tank share a tank bottom, the tank bottom is higher than the bottom of the inclined tube sedimentation tank, and no connecting pipeline is arranged between the reaction tank, coagulation tank, flocculation tank and inclined tube sedimentation tank, and a side wall is shared between two adjacent tanks. The shared side wall is arranged in mode 1 or mode 2 as follows: Mode 1: the bottom end of the shared side wall is arranged on the tank bottom, and the top end is lower than the highest water level line; Mode 2: the top end of the shared side wall is located at the highest water level line, and the bottom end is higher than the tank bottom, and a hole for communication is formed between the bottom end of the shared side wall and the tank bottom. The shared side wall between the flocculation tank and the inclined tube sedimentation tank is arranged in mode 1.

2. The high-density cell of claim 1, wherein, The shared side wall is arranged in mode 1, and the top end of the shared side wall is lower than the highest water level line by 200-300 mm.

3. The high-density cell of claim 1, wherein, The shared side wall between the reaction tank and the coagulation tank and the shared side wall between the coagulation tank and the flocculation tank are both arranged in mode 2, and the bottom end of the shared side wall is higher than the tank bottom by 100-300 mm.

4. The high-density cell of claim 1, wherein, The tank bottom is higher than the bottom of the inclined tube sedimentation tank by 1000-3000 mm.

5. The high-density cell of any one of claims 1-4, wherein, A water inlet is arranged on the side wall of the reaction tank, a partition plate is arranged in the reaction tank, the top end of the partition plate is located at the same horizontal position as the top of the reaction tank, the bottom end of the partition plate is higher than the tank bottom by 100-500 mm, and the horizontal distance between the partition plate and the water inlet is 100-500 mm.

6. The high-density cell of claim 5, wherein, A dosing area is formed between the partition plate and the side wall of the reaction tank provided with the water inlet, and a mixing area is formed between the partition plate and the shared side wall of the reaction tank and the coagulation tank, wherein a dosing pipe is arranged in the dosing area.

7. The high-density cell of claim 6, wherein, An axial flow agitator is arranged in the mixing area.

8. The high-density cell of any one of claims 1-4, wherein, A plurality of baffle plates are arranged in the flocculation tank, and the baffle plates are alternately arranged in mode 3 or mode 4, wherein: Mode 3: the bottom end of the baffle plate is arranged on the tank bottom, and the top end is lower than the highest water level line by 100-300 mm; Mode 4: the top end of the baffle plate is located at the highest water level line, and the bottom end is higher than the tank bottom by 100-300 mm, and a hole for communication is formed between the bottom end and the tank bottom.

9. The high-density cell of claim 8, wherein, A flow guide plate is arranged between the tank bottom of the flocculation tank and the shared side wall of the flocculation tank and the inclined tube sedimentation tank.

10. The high-density cell of claim 8, wherein, Baffle plates are also arranged in the reaction tank and / or the coagulation tank, and the baffle plates are arranged in mode 3 or mode 4.

11. The high-density cell of any one of claims 1-4, wherein, The reaction tank and the coagulation tank have a shared side wall arranged in mode 1, the coagulation tank and the flocculation tank have a shared side wall arranged in mode 2, and / or a sludge return pipe is arranged in the coagulation tank.

Images