CN201334417Y - Central island type-airlift type aeration integrated circulatory wastewater treatment device for biological reactor - Google Patents

Abstract

A central island-air-lift aeration integrated circulation bioreactor wastewater treatment device, O-shaped outer wall [1] has a D-shaped sedimentation tank [11] in the middle, and the sedimentation tank [11] has an arc-shaped surface There is a C-shaped partition wall [3] between one side and the outer wall [1], and the area formed between the C-shaped partition wall [3] and the sedimentation tank [11] is an aerobic zone [5], and the outer wall [1] ] is an anoxic zone [2], there is a partition wall [14] on one side of the sedimentation tank [11], and the zone formed between the partition wall [14] and the sedimentation tank [11] is a mixing zone [ 10], and the area formed between the outer wall [1] is the anaerobic zone [9], there is a flow wall [6] in the aerobic zone [5], the flow wall [6] and the C-shaped partition wall [ 3] forms an aerobic aeration zone, and forms an aerobic flow zone between the sedimentation tank [11]. The utility model has compact and simple structure, very simple operation and maintenance, requires less labor force, and is easy to realize remote automatic control.

Description

Central island-airlift aeration integrated cycle bioreactor wastewater treatment device

technical field

The utility model relates to a waste water treatment device for a central island type-airlift type aeration integrated cycle bioreactor.

Background technique

Integrated Oxidation Ditch (Integrated Oxidation Ditch) is also called a joint oxidation ditch. Broadly speaking, an integrated oxidation ditch is an oxidation ditch that does not have a separate secondary settling tank and sludge return device. Oxidation ditches in this sense include the Pasveer oxidation ditch that operated intermittently in the early days and the alternate oxidation ditch developed in Denmark in the 1970s. Oxidation ditch in a narrow sense refers to making full use of the large volume and water surface of the oxidation ditch, without affecting the normal operation of the oxidation ditch, by improving the structure of some areas of the oxidation ditch or setting certain devices in the ditch, so that the mud-water separation process can Oxidation ditch completed in the ditch. This concept was first proposed by the United States in the early 1980s, and this type of oxidation ditch is collectively referred to as ICC (Interchannel Clarifier) type oxidation ditch. So far, nearly a hundred integrated oxidation ditch of this type have been built in the United States. ditch. Compared with other oxidation ditches, the treatment effect of the integrated oxidation ditch is not very good. The main reasons are: First, due to the integrated design of the solid-liquid separator and the oxidation ditch, the effluent is susceptible to fluctuations in water quality and water volume, which affects the effluent. Second, the design and installation requirements for the solid-liquid separator are relatively high, but the requirements are often not met in engineering. However, the integrated oxidation ditch also has significant advantages: due to the omission of the secondary settling tank, the occupied area is small, the sludge returns automatically, the management is more convenient, the energy consumption is less, and the investment cost and operating cost are lower. Therefore, the process is especially suitable for promotion in sewage treatment of small cities and small towns, domestic sewage treatment in tourist attractions and similar situations.

Contents of the invention

The purpose of the utility model is to provide an integrated circulating bioreactor wastewater treatment device with distinct functional areas, relatively small footprint and low operating cost.

In order to achieve the above-mentioned purpose, the technical scheme that the utility model adopts is:

A central island type-airlift aeration integrated circulation bioreactor wastewater treatment device. There is a D-shaped sedimentation tank in the middle of the O-shaped outer wall, and there is a C-shaped partition wall, the area formed between the C-shaped partition wall and the sedimentation tank is an aerobic area, and the area formed between the outer wall and the outer wall is an anoxic area. There is a partition wall on the flat side of the sedimentation tank, and there is a partition between the partition wall and the sedimentation tank. The formed area is a mixing area, and the area formed between it and the outer wall is an anaerobic area. There is a flow wall in the aerobic area, and an aerobic aeration area is formed between the flow wall and the C-shaped partition wall. An aerobic flow zone is formed between them, and an aeration tube is arranged at the bottom of the aerobic aeration zone, and stirring flowmakers are respectively installed at the entrances of the aerobic flow zone, anoxic zone, and anaerobic zone on the same side.

The sedimentation tank is supported by supporting columns.

The sedimentation tank is located on one side of the mixing zone and extends downwards with a partition wall connected to the bottom plate of the outer wall, and the inner side of the partition wall has a slope extending inward.

The lower part of the sedimentation tank is a cone bucket arranged in parallel, and the cone bucket is an inverted platform structure.

The utility model has the following advantages:

1. The structure of the utility model is compact and simple, the operation and maintenance are very simple, the required labor force is small, and it is easy to realize remote automatic control.

2. The sedimentation tank of this utility model is installed in the aerobic flow area, and it is arranged in a D shape. There is no need to build a secondary sedimentation tank outside. The inverted platform structure of the cone bucket in the lower part of the sedimentation tank can effectively alleviate and reduce the impact of the bottom fluid on the sedimentation tank. At the same time, due to the negative pressure generated in the bottom fluid flow, the sludge can realize self-reflux, which reduces the occupied area and operating costs, and is conducive to maintaining the dissolved oxygen in the effluent and ensuring the quality of the effluent. The aeration tube is placed at the bottom of the aerobic aeration area and is arranged along the two C partition walls, so that the aeration is uniform, which can reduce the turbulent effect of aeration on the sedimentation tank and also reduce the resistance of fluid flow.

3. The aerobic, anoxic, and anaerobic functional areas of the utility model are clearly divided, easy to control, and conducive to the simultaneous completion of the removal of organic matter and biological nitrogen and phosphorus removal. In the aerobic zone, the mixed solution is in an aerobic state, which can effectively degrade organic matter and oxidize ammonia nitrogen to nitrate nitrogen (nitrate nitrogen and nitrite nitrogen), and realize the absorption of phosphorus by sludge and then phosphorus removal. In the anoxic zone, it is anoxic, and organic matter is used as the carbon source. Under the action of denitrifying bacteria, the nitrate nitrogen is reduced to nitrogen and removed from the water. The anaerobic zone can degrade a considerable part of COD and organic matter, and release phosphorus from sludge.

4. The utility model adopts a unique air lift method for aeration.

5. The utility model is beneficial to the multiple circulation of the mixed solution between aerobic-anoxic-anaerobic, and automatic reflux to achieve the purpose of nitrogen and phosphorus removal.

Description of drawings

Fig. 1 is a schematic plan view of the utility model;

Fig. 2 is a schematic sectional view of the utility model.

Detailed ways

Referring to Figure 1 and Figure 2, a central island type-airlift aeration integrated circulation bioreactor wastewater treatment device, O-shaped outer wall 1 has a D-shaped sedimentation tank 11 in the middle, and the sedimentation tank 11 is arc-shaped There is a C-shaped partition wall 3 between one side of the surface and the outer wall 1, and the C-shaped partition wall 3 is close to the bottom plate 16. The area formed between the sedimentation tank 11 and the sedimentation tank 11 is an aerobic zone 5, and the area formed between the outer wall 1 It is the anoxic zone 2, and there is a partition wall 14 on one side of the sedimentation tank 11 plane shape, the zone formed between the partition wall 14 and the sedimentation tank 11 is the mixing zone 10, and the zone formed between the external wall 1 is the anaerobic zone 9, There is a flow wall 6 in the aerobic area 5, and an aerobic aeration area is formed between the flow wall 6 and the C-shaped partition wall 3, which is crescent-shaped, and an aerobic flow area is formed between the sedimentation tank 11. An aeration tube 4 is arranged at the bottom of the oxygen aeration zone, and a stirring flow impeller 7 is installed at the entrances of the aerobic flow zone, anoxic zone 2 and anaerobic zone 9 on the same side.

The sedimentation tank 11 is supported overhead by supporting columns 19, and the window connecting the sedimentation tank 11 and the aerobic flow zone 5 is between the supporting columns 19. The sedimentation tank 11 is located on one side of the mixing zone 10 and extends downward with a partition wall 18 connected to the outer wall bottom plate 16, and the inside of the partition wall 18 has an inwardly extending slope 17, and the horizontal angle of the slope 17 is 55-65° . The lower part of the sedimentation tank 11 is a parallel cone bucket 12, the cone bucket 12 is an inverted platform structure, and the angle between the cone surface and the horizontal plane is 60-75°.

The water inlet 8 is opened on the outer wall 1, corresponding to the upper part of the anaerobic zone 9, and the upper part of the sedimentation tank 11 is provided with an overflow weir 15, and the overflow weir 15 is provided with a water outlet 13.

The working principle of the utility model is: the sewage enters the anaerobic zone 9 equipped with microbial groups (activated sludge) from the water inlet 8, and enters the anoxic zone 2 under the impetus of the agitating flow device 7 at the entrance of the anaerobic zone 9 . In the anoxic zone 2, the mixed solution is in an anoxic state, and the nitrate nitrogen is reduced to nitrogen under the action of denitrifying bacteria and removed from the water; denitrification uses organic matter as the carbon source, such as COD, so part of the organic matter can be removed at the same time; Then a part enters the mixing zone 10 to be mixed with the mixed liquid from the aerobic flow zone, and a part enters the anaerobic zone 9 to release sludge phosphorus. In the aerobic aeration area, the aeration tube 4 installed at the bottom along the outer partition wall 3 and the inner partition wall 6 is used for oxygenation and aeration, so that the mixed liquid is in an aerobic state. The removal of organic matter and the nitrification reaction of ammonia nitrogen and the realization of phosphorus absorption by sludge to remove phosphorus, while the nitrification products are circulated to the anoxic zone 2 for denitrification to remove nitrogen.

At the same time, a part of the mixed liquid enters the sedimentation tank 11 from the cone bucket 12 at the bottom of the sedimentation tank 11 in the aerobic flow zone, and the solid-liquid separation is carried out under the adsorption and collision of the sludge suspension layer and the gravity of the activated sludge itself. After solid-liquid separation, the supernatant liquid equal to that of the influent water is discharged from the water outlet 13 through the overflow weir 15, and the sludge is driven by its own gravity and the flowing fluid at the bottom, and is self-refluxed by the cone bucket 12 to the aerobic filter. In the flow area, together with the mixed liquid, the aerobic-anoxic-anaerobic multiple cycles are realized in the device under the impetus of the agitating flow maker 7, and the sewage is purified.

Claims (7)

1. A central island type-airlift aeration integrated circulation bioreactor wastewater treatment device, which is characterized in that there is a D-type sedimentation tank [11] in the middle of the O-shaped outer wall [1], and the sedimentation tank [1] 11] There is a C-shaped partition wall [3] between one side of the arc surface and the outer wall [1], and the area formed between the C-shaped partition wall [3] and the sedimentation tank [11] is an aerobic zone [5]. The area formed between the outer wall [1] is anoxic zone [2], and there is a partition wall [14] on one side of the sedimentation tank [11], and the partition wall [14] and the sedimentation tank [11] are formed The area is a mixing area [10], and the area formed between it and the outer wall [1] is an anaerobic area [9], and there is a flow wall [6] in the aerobic area [5], and the flow wall [6] and An aerobic aeration area is formed between the C-shaped partition walls [3], an aerobic flow area is formed between the sedimentation tank [11], and an aeration pipe [4] is arranged at the bottom of the aerobic aeration area, which is located on the same side The entrances of the aerobic flow zone, the anoxic zone [2] and the anaerobic zone [9] are respectively equipped with stirring flowmakers [7]. 2. The central island type-airlift aeration integrated circulation bioreactor wastewater treatment device according to claim 1, characterized in that it is formed between the flow wall [6] and the C-shaped partition wall [3]. The oxygen aeration area is crescent-shaped. 3. The central island-airlift aeration integrated circulation bioreactor wastewater treatment device according to claim 1, characterized in that the sedimentation tank [11] is supported by supporting columns [19]. 4. The central island type-airlift aeration integrated circulation bioreactor wastewater treatment device according to claim 3, characterized in that the sedimentation tank [11] is located on the side of the mixing zone [10] and extends downward with The partition wall [18] that the outer wall base plate [16] is connected, and the inboard of the partition wall [18] has a slope [17] extending inward. 5. The central island-airlift aeration integrated circulation bioreactor wastewater treatment device according to claim 4, characterized in that the horizontal angle of the slope [17] is 55-65°. 6. The central island type-airlift aeration integrated circulation bioreactor wastewater treatment device according to claim 3, characterized in that the lower part of the sedimentation tank [11] is a parallel arrangement of cone buckets [12], The cone bucket [12] is an inverted platform structure. 7. The central island-airlift aeration integrated circulation bioreactor wastewater treatment device according to claim 6, characterized in that the angle between the conical surface of the cone bucket [12] and the horizontal plane is 60-75°.

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