Mechanical stirring accelerated clarification tank

Abstract

The utility model provides a mechanical stirring accelerated clarification tank, which relates to the technical field of industrial wastewater pretreatment, and is characterized in that a concrete cover plate is additionally arranged at the top of the tank, a plurality of sampling ports are arranged in the vertical direction of inclined tube filler in a clear water area, a side sludge discharge hopper is omitted, and the distance between an umbrella plate and the tank wall is increased to accelerate the deposited sludge to flow into the sludge hopper. A bottom sludge discharge pipe and an edge sludge discharge pipe of the sludge hopper are independently connected with a sludge discharge pump, meanwhile, automatic sludge discharge valves are independently arranged on the bottom sludge discharge pipe and the edge sludge discharge pipe, and two pipelines are arranged at an outlet of the sludge discharge pump to convey sludge in the sludge hopper to a sludge concentration tank and a reaction area respectively. According to the utility model, the turning phenomenon of the machining pool is greatly reduced, the position of a sludge layer can be observed at any time, the sludge concentration can be monitored at any time, the sludge discharge period of the machining pool can be controlled, the sludge backflow is increased, particularly, the working condition that low-turbidity inlet water is difficult to flocculate is greatly improved, the dosage of a flocculating agent can be reduced by more than 40%, and the sludge treatment capacity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial wastewater pretreatment, in particular to a mechanical stirring accelerated clarification tank. Background Art

[0002] Mechanical stirring accelerated clarification tank is currently the most widely used flocculation sedimentation equipment, especially in the raw water pretreatment of thermal power generation and industrial wastewater industries, and an important pretreatment method before sand filtration and carbon filtration. By adding sodium carbonate or lime, flocculants, bactericides and other agents to the influent water, the functions of water hardness removal, flocculation sedimentation, and solid-liquid separation are achieved.

[0003] Mechanically agitated accelerated clarification tanks (abbreviated as mechanical agitation tanks) are often placed in outdoor environments due to their large size. The flocculation and sedimentation reactions in mechanical agitation tanks are often affected by conditions such as temperature, agitation speed, instantaneous flow rate, and sludge concentration. At present, most large-diameter mechanical agitation tanks are open-topped. Especially in cold winter weather, low temperatures will cause the viscosity of the flocs to increase, the sedimentation rate to slow down, and the tanks to be frequently turned over. The turbidity of the effluent does not meet the standards, increasing the load of subsequent medium filtration. In addition, whether it is treating surface water or industrial water, due to the existing pre-filtration section at the front end, the turbidity of the inlet water of the mechanical agitation tank is often not high, and the reaction zone of the mechanical agitation tank requires the continuous collision and full mixing of flocculants and sludge particles to achieve the effect of agglomerating into large particles of alum. Therefore, maintaining a certain concentration of sludge is also an important factor affecting the operation of the mechanical agitation tank. It can be seen that how to achieve real-time observation of the sludge content in the tank body and increase sludge return is the key to the improvement of the current mechanical agitation tank.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The utility model aims to provide a mechanical stirring accelerated clarification tank, which greatly reduces the phenomenon of machine-added tank overturning, can observe the mud layer position and monitor the sludge concentration at any time, can control the sludge discharge cycle of the machine-added tank, increase sludge return, and can greatly improve the working condition where low turbidity influent is difficult to flocculate.

[0006] The utility model provides a mechanical stirring accelerated clarification tank, wherein the top of the mechanical stirring accelerated clarification tank is provided with a concrete cover plate and a movable steel grid;

[0007] The concrete cover plate covers between the two alternate partial radiation water collecting tanks;

[0008] The movable steel grid is covered between the remaining radiation water collecting tanks alternately spaced apart and is used as an inspection hole;

[0009] A plurality of sampling ports are arranged in the vertical direction of the oblique tube packing in the clear water area of ​​the mechanical stirring accelerated clarification tank for sampling at irregular intervals and observing the mud layer position and sludge settling ratio at different heights;

[0010] The mechanical stirring accelerates the clarification tank to eliminate the mud hopper at the side, and at the same time increases the distance between the umbrella plate and the tank wall to accelerate the flow of the deposited mud into the mud hopper;

[0011] The bottom mud discharge pipe and the side mud discharge pipe of the sludge hopper are independently connected to the mud discharge pump, and the bottom mud discharge pipe and the side mud discharge pipe are independently provided with automatic mud discharge valves for regularly discharging the sludge in the sludge hopper to the sludge thickening tank or a reaction zone;

[0012] The outlet of the sludge pump is provided with two pipelines for conveying the sludge in the sludge hopper to the sludge concentration tank or a reaction zone respectively.

[0013] Furthermore, the total number of the radiation water collection tanks is 12;

[0014] The total number of the concrete cover slabs is 8.

[0015] Furthermore, the concrete cover plate is placed on the side grooves of the radiation water collecting trough to form a closed space, thereby covering the parts of the radiation water collecting troughs spaced apart from each other.

[0016] Furthermore, the inspection holes are symmetrical in pairs.

[0017] Furthermore, the movable steel grating is supported by pre-buried angle steels.

[0018] Furthermore, the radiation water collection tank, the annular water collection tank and the total water collection tank of the mechanical agitation accelerated clarification tank are independently covered with steel gratings as walkway plates.

[0019] Furthermore, the mechanical agitation accelerated clarification tank is provided with guardrails along the circumference of the tank wall.

[0020] Furthermore, the number of the sampling ports is at least 4.

[0021] Furthermore, mud discharge outlet valves are independently provided on the two pipelines at the mud discharge pump outlet.

[0022] Compared with the prior art, the utility model has at least the following beneficial effects:

[0023] The mechanical stirring accelerated clarification tank (referred to as the mechanical stirring tank) provided by the utility model can greatly reduce the phenomenon of tank turnover, can not only observe the mud layer position and monitor the sludge concentration at any time, but also can control the sludge discharge cycle of the mechanical stirring tank and increase the sludge return, especially can greatly improve the working condition that low turbidity influent is difficult to flocculate, can reduce the dosage of flocculant by more than 40%, reduce the sludge treatment amount, and has good economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the top view of the mechanical stirring accelerated clarification tank provided by the utility model;

[0026] Figure 2 This is a front view structural schematic diagram of the mechanical stirring accelerated clarification tank provided by the utility model;

[0027] Figure 3 The utility model provides a schematic diagram of the construction structure of the concrete cover plate on the mechanical stirring accelerated clarification tank.

[0028] Icons: 1-radiant water collecting trough corbel; 2-concrete cover; 3-movable steel grille; 4-embedded angle steel; 5-annular water collecting trough; 6-radiant water collecting trough; 7-main water collecting trough; 8-annular railing; 9-sampling port; 10-umbrella board; 11-bottom mud discharge pipe; 12-first side mud discharge pipe; 13-second side mud discharge pipe; 14-bottom row automatic valve; 15-first side row automatic valve; 16-second side row automatic valve; 17-first row mud outlet valve; 18-second row mud outlet valve; 19-second row mud pump outlet pipe; 20-sludge thickening tank; 21-first row mud pump outlet pipe; 22-sludge hopper; 23-clean water area filler; 24-first reaction area; 25-mud pump. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] The utility model provides a mechanical stirring accelerated clarification tank, the top of which is provided with a concrete cover plate and a movable steel grille;

[0031] Wherein, the concrete cover plate covers between the two alternate partial radiation water collection tanks;

[0032] The movable steel grating is covered between the remaining radiation water collection tanks in two-by-two intervals and is used as an inspection hole;

[0033] At the same time, a number of sampling ports are provided in the vertical direction of the inclined tube packing in the clear water area of ​​the mechanical stirring accelerated clarification tank for irregular sampling and observation of the mud layer position and sludge settling ratio at different heights;

[0034] In addition, the mechanical stirring accelerates the clarification tank to eliminate the side mud hopper, and at the same time increase the distance between the umbrella plate and the tank wall to accelerate the flow of deposited sludge into the sludge hopper;

[0035] It should be noted that the distance between the umbrella plate and the pool wall can be 150mm to 350mm, which varies with the change of the diameter of the machine-processed pool. The diameter of the machine-processed pool is usually 9.8m to 29.0m. For example, when the diameter of the machine-processed pool is 14.3m, the distance between the umbrella plate and the pool wall can be set to 200mm, which can ensure that the sludge in the clarification area flows smoothly into the sludge hopper.

[0036] The bottom mud discharge pipe and the side mud discharge pipe of the sludge hopper are independently connected to the mud discharge pump, and the bottom mud discharge pipe and the side mud discharge pipe are independently provided with automatic mud discharge valves for regularly discharging the sludge in the sludge hopper to the sludge thickening tank or a reaction area;

[0037] At the same time, the outlet of the sludge pump is provided with two pipelines for conveying the sludge in the sludge hopper to the sludge thickening tank or a reaction area respectively.

[0038] The mechanical stirring accelerated clarification tank (referred to as the mechanical stirring tank) provided by the utility model can greatly reduce the phenomenon of tank turnover, can not only observe the mud layer position and monitor the sludge concentration at any time, but also can control the sludge discharge cycle of the mechanical stirring tank and increase the sludge return, especially can greatly improve the working condition that low turbidity influent is difficult to flocculate, can reduce the dosage of flocculant by more than 40%, reduce the sludge treatment amount, and has good economic and environmental benefits.

[0039] In a preferred embodiment, the total number of radiation water collection gutters may be 12; the total number of concrete cover plates may be 8.

[0040] The top view of the machine pool provided by the utility model is shown in Figure 1 and front view Figure 2 , 8 concrete cover plates 2 are covered between the 12 radiation water collection tanks 6, specifically, concrete cover plates 2 are covered between the radiation water collection tanks 6 spaced apart in pairs, and 4 water collection tank gaps are reserved as inspection holes and covered with movable steel grilles 3.

[0041] In a preferred embodiment, the utility model retains four symmetrical water collection tank gaps as inspection holes, and when it is necessary to replace the filler and inspect the mixer, the tank body can be entered through the inspection holes for inspection.

[0042] In a preferred embodiment, the movable steel gratings 3 can be supported by embedded angle steels 4 to ensure the surface support strength and the air permeability of the machining pool.

[0043] In a preferred embodiment, the movable steel grating 3 and the embedded angle steel 4 can be sprayed with waterproof paint by high-pressure spraying.

[0044] In a preferred embodiment, the radiation water collection tank 6, the annular water collection tank 5 and the total water collection tank 7 can be independently covered with steel gratings as walkway plates, and a circle of annular railings 8 can be provided (welded) along the circumference of the machined pool wall.

[0045] In a preferred embodiment, the concrete cover plate 2 is placed on the side grooves of the radiation water collecting tank 6 to form a closed space, thereby covering the space between the two alternate parts of the radiation water collecting tanks.

[0046] The side of the interval radiation water collection tank is cut into a concave groove. Figure 3 The concrete cover plate 2 is placed on the grooves on both sides to form a closed space and reduce the heat dissipation area; wherein the reinforcement of the radiation water collecting trough corbel 1 is enhanced to grade 3 steel, and its thickness can be set to 650mm.

[0047] In a preferred embodiment, four sampling ports 9 can be set in the vertical direction of the clean water area filler 23. The sampling ports 9 perform irregular sampling through sampling valves, and the mud layer position and sludge settling ratio at different heights can be observed at the same time to facilitate timely adjustment of operating parameters.

[0048] The machined pool of the utility model eliminates the side mud discharge hopper and increases the distance between the umbrella plate 10 and the pool wall to 200 mm, so that the deposited sludge can flow into the bottom mud hopper 22; the sludge hopper 22 is connected to the mud discharge pump 25 through the bottom mud discharge pipe 11, the first side mud discharge pipe 12 and the second side mud discharge pipe 13, and at the same time, the bottom mud discharge pipe 11, the first side mud discharge pipe 12 and the second side mud discharge pipe 13 are respectively provided with a bottom discharge automatic valve 14, a first side discharge automatic valve 15 and a second side discharge automatic valve 16, and the set automatic program can be used to open the above-mentioned different automatic valves at a fixed time, so as to discharge the bottom sludge to the sludge thickening tank 20; wherein, each mud discharge pipe can be sprayed with waterproof paint by high-pressure spraying.

[0049] The utility model eliminates the mud discharge hopper at the edge of the machine-processed pool, and at the same time increases the distance between the umbrella plate of the machine-processed pool and the pool wall to 200 mm, so that the sludge settled in the clear water area can be smoothly discharged to the sludge hopper or its upper area, which not only saves the sludge hopper manufacturing materials and construction work, but also can increase the sludge concentration in a reaction zone, which is more conducive to the formation of flocculation precipitation nuclei.

[0050] In a preferred embodiment, a first mud outlet valve 17 and a second mud outlet valve 18 can be independently provided on the two pipelines at the mud pump outlet, which are used to respectively control the first mud pump mud outlet pipe 21 and the second mud pump mud outlet pipe 19 to transport the sludge to the sludge thickening tank 20 or a reaction zone 24 respectively.

[0051] Two pipelines are set at the outlet of the machine pool sludge pump. The opening of the first sludge outlet valve 17 and the second sludge outlet valve 18 are controlled by an automatic program, so that the sludge can be transported to the sludge thickening tank or a reaction zone respectively. Most of the sludge is returned to a reaction zone, and a small amount of sludge is discharged to the sludge thickening tank.

[0052] Example 1

[0053] This embodiment provides a mechanical stirring accelerated clarification tank with a diameter of 14300 mm. The top of the mechanical stirring accelerated clarification tank is provided with a concrete cover plate 2 and a movable steel grid 3;

[0054] Eight concrete cover plates 2 are covered between the alternately spaced radial water collection tanks 6 (a total of 12), and four symmetrical water collection tank gaps are reserved as inspection holes and covered with movable steel grilles 3;

[0055] The movable steel grids 3 are supported by embedded angle steels 4 to ensure the surface support strength; the concrete cover plate 2 is placed on the side grooves of the radiation water collection tank 6 to form a closed space, thereby covering the space between the two alternate radiation water collection tanks;

[0056] Four sampling ports 9 are arranged in the vertical direction of the filler 23 in the clean water area. The sampling ports 9 are used to take samples at irregular intervals through sampling valves. At the same time, the mud layer position and the sludge settling ratio at different heights can be observed to facilitate timely adjustment of the operating parameters.

[0057] The mud hopper at the side is removed, and the distance between the umbrella board 10 and the pool wall is increased to 200 mm, so that the sludge settled in the clear water area can be smoothly discharged to the bottom mud hopper 22 or its upper area;

[0058] The sludge hopper 22 is connected to a sludge pump 25 through a bottom sludge discharge pipe 11, a first side sludge discharge pipe 12, and a second side sludge discharge pipe 13. The outlet of the sludge pump is provided with two pipelines, namely, a first sludge pump outlet pipe 21 and a second sludge pump outlet pipe 19, for conveying the sludge in the sludge hopper to a sludge thickening tank 20 or a reaction zone 24 respectively.

[0059] At the same time, the bottom mud discharge pipe 11, the first side mud discharge pipe 12 and the second side mud discharge pipe 13 are respectively provided with a bottom discharge automatic valve 14, a first side discharge automatic valve 15 and a second side discharge automatic valve 16. The automatic program set can be used to regularly open the above-mentioned different automatic valves, so as to regularly discharge the bottom sludge to the sludge thickening tank 20;

[0060] The first mud pump outlet pipe 21 and the second mud pump outlet pipe 19 of the mud pump are respectively provided with a first mud outlet valve 17 and a second mud outlet valve 18. The opening modes of the bottom discharge automatic valve 14, the first side discharge automatic valve 15, the second side discharge automatic valve 16, the first mud outlet valve 17 and the second mud outlet valve 18 are controlled by an automatic program to transport the sludge to a sludge thickening tank 20 or a reaction zone 24 respectively, and most of the sludge can be drained to a reaction zone 24.

[0061] Example 2

[0062] This embodiment provides a mechanical stirring accelerated clarification tank, which is different from the embodiment 1 in that the radiation water collection tank 6, the annular water collection tank 5 and the total water collection tank 7 are all covered with steel gratings as walkway plates, which is more conducive to observing the reaction effect and clarification effect of each clear water area by standing and walking, thereby effectively controlling the discharge of mud;

[0063] The rest of the settings are the same as those in Example 1.

[0064] Comparative Example 1

[0065] This comparative example provides an ordinary mechanical stirring accelerated clarification tank in the prior art. The ordinary mechanical stirring accelerated clarification tank has no cover (the temperature difference in winter is large and the tank is easy to overturn) and no walkway plate, only an observation port at the total water outlet is reserved, and there is no sampling port in the clarification area. The sludge is discharged by a sludge hopper and an edge siphon and there is no sludge reflux.

[0066] Test example

[0067] The mechanical stirring accelerated clarification tanks of Example 1 and Comparative Example 1 were tested and compared as follows:

[0068] The influent is all recycled water from the plant. Combined with the operation data records, the influent and effluent turbidity, sludge discharge times and reagent dosage parameters are compared;

[0069] Under the same inlet turbidity conditions, the effluent turbidity of the mechanical stirring accelerated clarifier of Example 1 is better than that of Comparative Example 1, which can be reduced from 10-20 NTU to below 5 NTU, and the pool turnover phenomenon is greatly reduced; at the same time, the sludge discharge cycle is also increased by 1-2 hours, which not only reduces the amount of sludge discharge, reduces the disposal cost of solid waste, but also reduces the dosage of flocculant sodium carbonate, which has dual economic benefits;

[0070] The above test data are shown in Table 1:

[0071] Table 1

[0072] Serial number project Comparative Example 1 Example 1 Remark 1 Outlet turbidity (NTU) 10～20 ≤5 When the inlet water turbidity is close to 2 Mud discharge interval (h) 4h 6～8h Time to discharge to the concentration tank 3 Flocculant cost (yuan) 0.171 0.102 Yuan / ton water 4 Sodium carbonate cost (yuan) 1.611 0.932 Yuan / ton water 5 Dry sludge output (t) 2.42 1.59 After dehydration

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A mechanical stirring accelerated clarification tank, characterized in that: The top of the mechanical stirring accelerated clarification tank is provided with a concrete cover plate and a movable steel grid; The concrete cover plate covers between the two alternate partial radiation water collecting tanks; The movable steel grid is covered between the remaining radiation water collecting tanks alternately spaced apart and is used as an inspection hole; A plurality of sampling ports are arranged in the vertical direction of the oblique tube packing in the clear water area of ​​the mechanical stirring accelerated clarification tank for sampling at irregular intervals and observing the mud layer position and sludge settling ratio at different heights; The mechanical stirring accelerates the clarification tank to eliminate the mud hopper at the side, and at the same time increases the distance between the umbrella plate and the tank wall to accelerate the flow of the deposited mud into the mud hopper; The bottom mud discharge pipe and the side mud discharge pipe of the sludge hopper are independently connected to the mud discharge pump, and the bottom mud discharge pipe and the side mud discharge pipe are independently provided with automatic mud discharge valves for regularly discharging the sludge in the sludge hopper to the sludge thickening tank or a reaction zone; The outlet of the sludge pump is provided with two pipelines for conveying the sludge in the sludge hopper to the sludge concentration tank or a reaction zone respectively.

2. The mechanical stirring accelerated clarification tank according to claim 1, characterized in that: The total number of the radiation water collection tanks is 12; The total number of the concrete cover slabs is 8.

3. The mechanical stirring accelerated clarification tank according to claim 1 or 2, characterized in that: The concrete cover plate is placed on the side grooves of the radiation water collecting tank to form a closed space, thereby covering the parts of the radiation water collecting tanks alternately spaced apart.

4. The mechanical stirring accelerated clarification tank according to claim 1 or 2, characterized in that: The inspection holes are symmetrical in pairs.

5. The mechanical stirring accelerated clarification tank according to claim 4, characterized in that: The movable steel grille is supported by pre-buried angle steels.

6. The mechanical stirring accelerated clarification tank according to claim 1, characterized in that: The radiation water collection tank, the annular water collection tank and the total water collection tank of the mechanical agitation accelerated clarification tank are all independently covered with steel grids as walkway plates.

7. The mechanical stirring accelerated clarification tank according to claim 6, characterized in that: The mechanical stirring accelerated clarification tank is provided with guardrails along the periphery of the tank wall.

8. The mechanical stirring accelerated clarification tank according to claim 1, characterized in that: The number of the sampling ports is at least 4.

9. The mechanical stirring accelerated clarification tank according to claim 1, characterized in that: Mud discharge outlet valves are independently provided on the two pipelines at the outlet of the mud discharge pump.

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