CN201358188Y - Sewage treatment device with integrated fluidized beds and fixed beds - Google Patents

Abstract

The utility model discloses a fluidized bed-fixed bed integrated sewage treatment device. It consists of a pool body, in which a vertical partition is installed to divide the pool body into seven reaction pools connected in series, and the lower part of the front reaction pool and the upper part of the rear reaction pool of each adjacent reaction pool are connected to each other. 3, 5 and 6 reaction tanks are aerobic fluidized beds, the tanks are partially filled with porous elastic carriers, and an aeration device is arranged on the bottom side of the reaction tanks, and the suspended carriers in the tanks are in a fluidized state driven by air; 7. The reaction tank is a fixed bed, and the tank is filled with a porous elastic carrier, and the carrier is in a fixed state. There is a porous isolation plate at the upper and lower ends of all reaction tanks, and a mud discharge port is provided at the bottom of each reaction tank. The upper part of the first reaction tank has a water inlet, and the upper part of the first, third, fifth and seventh reaction tanks has overflow weirs. 7 There is a water outlet on the upper part of the reaction pool. The treatment device has the advantages of high treatment efficiency, low operating energy consumption, strong impact load resistance, less residual sludge, less floor space, convenient management, etc., and is especially suitable for small sewage treatment fields.

Description

Fluidized bed - fixed bed integrated sewage treatment device

technical field

The utility model relates to a sewage treatment device, in particular to a fluidized bed-fixed bed integrated sewage treatment device.

Background technique

With the development of economy, industrialization, and the acceleration of urbanization, the problem of water pollution in our country is becoming more and more serious. People produce a large amount of domestic sewage and various industrial wastewater in the process of life and production. If these wastewaters are not treated or are not treated up to standard and discharged directly, it will cause serious water pollution. However, the transformation and expansion of the municipal drainage pipe network and the construction of urban sewage treatment plants are seriously lagging behind. Most of the sewage is directly discharged into the water body without treatment, causing serious pollution. At the same time, due to the weak awareness of rural water environment and the shortage of management funds, the direct discharge of domestic sewage in rural areas without treatment is also an important reason for the decline in water quality.

At this time, the application of decentralized small sewage treatment devices can effectively treat the water and discharge it up to the standard, thereby reducing the pollution of the water body. Therefore, only by developing small-scale sewage treatment equipment with high efficiency, low consumption, low cost and low operating costs as soon as possible, can we adapt to the needs of my country's small and medium-sized towns and new rural construction.

In the current sewage treatment technology, in order to achieve the goal of denitrification and phosphorus removal, most of the processes used are A ² /O and its various improved forms, but this process requires reflux equipment for nitrifying liquid and sludge. If you want to maintain a high denitrification and phosphorus removal effect, you must increase the return flow, which will inevitably increase the daily operating costs of the sewage plant, and in actual engineering applications, the process is complicated and cumbersome, and there are problems in small sewage treatment applications. Certain flaws.

Contents of the invention

In order to overcome the shortcomings of the traditional technology, the utility model provides a fluidized bed-fixed bed integrated sewage treatment device in combination with the advantages of the biofilm method. The complex mixed liquor and sludge return system is omitted, the energy consumption in the process of sewage treatment is reduced, the amount of remaining sludge and the occupied area are reduced, and the efficiency of sewage treatment is improved.

In order to achieve the above object, the utility model adopts the following technical scheme: a fluidized bed-fixed bed integrated sewage treatment device, which includes a pool body, which is characterized in that a vertical partition is installed in the pool body, The pool body is divided into 7 reaction pools connected in series. The lower part of the front reaction pool and the upper part of the rear reaction pool of each adjacent reaction pool are connected to each other, and the waste water flows up and down along the partition in the reaction pool, so that the water flow is generally zigzag up and down. , but the water flow in the whole pool is pushed horizontally at a slower speed. Among them, the No. 2, No. 3, No. 5 and No. 6 reaction pools are aerobic fluidized beds. The pools are partially filled with porous elastic carriers, and the volume filling rate is 26%-46%. Aeration devices are arranged on the bottom side of the reaction pools. The suspended carrier in the tank is in a fluidized state; the first, fourth and seventh reaction tanks are fixed beds, and the tanks are filled with porous elastic carriers, the volume filling rate is 95%-100%, the carrier is in a fixed state, and the reaction tanks are anaerobic. oxygen state. A porous isolation plate is installed at the upper and lower ends of all reaction pools to fix the carrier to prevent the loss of the carrier. There are mud outlets at the bottom of each reaction tank, which can discharge mud from each reaction tank regularly. There is a water inlet on the upper part of the first reaction tank, overflow weirs on the upper part of the first, third, fifth and seventh reaction tanks, and the upper part of the seventh reaction tank There is a drain at the bottom. In order to ensure the final overflow water, a diversion compartment for changing the flow direction is set between the first and second reaction tanks. In order to prevent the sewage from flowing backwards between the reaction tanks and ensure that the sewage is pushed forward horizontally under the action of gravity, The partitions with overflow weirs in the reaction tank are lowered sequentially along the direction of water flow.

Compared with the prior art, the utility model has the following substantive features and advantages:

① No need for special mixed liquor and sludge return equipment, low energy consumption for operation

In the operating cost of the device, energy consumption accounts for a relatively large proportion, and reducing energy consumption is the key to reducing operating costs. Since the treatment device adopts the biofilm process, the device is equipped with a porous elastic carrier, and the reactor has a high concentration of microorganisms. By controlling the dissolved oxygen level in the reactor, abundant aerobic anaerobic bacteria can be formed inside the biofilm. Oxygen microenvironment, and longer sludge age is also conducive to the growth of nitrifying bacteria, and it is easy to achieve efficient simultaneous nitrification and denitrification denitrification. By setting partitions in the pool body, the aerobic zone and the anoxic zone are alternately performed, and a good environment is created for the efficient removal of nitrogen and phosphorus, so a special reflux device can be omitted. The biofilm method can also save the stirring equipment required in the anoxic zone, and the whole device has the characteristics of low energy consumption.

②Fluidized bed and fixed bed run at intervals, with high processing efficiency and strong impact load resistance

The suspended carrier in the aerobic tank of this device forms a fluidized bed with the gas generated by aeration, and the organic matter and dissolved oxygen in the sewage rapidly diffuse to the surroundings of the biological carrier due to the turbulent hydraulic conditions in the fluidized bed. It expands the contact area between organisms and sewage and the relative movement between sewage and biofilm, promotes the adsorption of organic matter by the carrier biofilm, and also creates necessary conditions for the degradation of organic matter. The rate of biochemical reactions is high and the impact load is resistant. The capacity is strong, and there is no problem of clogging, but the effluent water is easy to carry a large number of biofilm fragments that fall off. In addition to the filtering function of the fixed bed, the sewage treated by the aerobic fluidization tank contains a large amount of dissolved oxygen, which makes the whole reactor in an anoxic and anaerobic state, which is conducive to the denitrification reaction and further improves the overall efficiency. Nitrogen removal performance of the treatment unit. The organic combination of aerobic fluidized bed and fixed bed makes the device have higher treatment efficiency for sewage.

③The amount of residual sludge is small, the floor area is small, and the management is convenient

The treatment device is equipped with a porous elastic carrier, and a series of multiple reaction tanks are used in series, which prolongs the sludge residence time in the reactor and the longer microbial food chain reduces the sludge production. This integrated reaction device has a high concentration of microorganisms, and utilizes the common wall of the reactor, which greatly reduces the occupied area of the equipment. The continuous flow of water in and out has the characteristics of convenient operation and management.

Description of drawings

Fig. 1 is the structural schematic diagram of the utility model

Fig. 2 is the three-dimensional structure schematic diagram of the present utility model

Detailed ways

Referring to Fig. 1, Fig. 2, a preferred embodiment of the present utility model is described in detail as follows in conjunction with accompanying drawing: fluidized bed - fixed bed integrated sewage treatment device, it comprises a pool body 16, vertical partition is set in the pool body 16 The plate 15 divides the cell body into seven series reaction cells 1-7 of equal size, and the lower part of the front reaction cell and the upper part of the rear reaction cell of each adjacent reaction cell communicate with each other. Among them, the 1st, 4th and 7th reaction tanks are aerobic fluidized tanks, with a porous elastic carrier 14 inside, the volume filling rate of the carrier is 26%-46%, and a strip aeration device 10 is set on the bottom side of the fluidized tanks. . The 2nd, 3rd, 5th and 6th reaction pools are fixed pools with a porous elastic carrier 14 inside, and the volume filling rate of the carrier is 95%-100%. A porous isolation plate 13 is provided at the upper and lower ends of each reaction tank to prevent the loss of the carrier, and a mud discharge port is provided at the bottom for regular mud discharge. Sewage enters the reactor from the water inlet 8, flows around each reactor in sequence, pushes forward horizontally, and the treated water overflows through the overflow weir 12, and finally passes through the outlet 9 to be discharged from the device.

The invention adopts the mode of interval operation between fluidized bed and fixed bed, which has unique advantages, not only makes the device have strong organic matter, nitrogen and phosphorus removal performance, but also ensures that the SS in the effluent is at a lower level. The porous elastic carrier used in the device is a polyurethane material with a cubic structure. The specific gravity of the carrier is similar to that of water after being filmed, and it is in a suspended state in water. It has the characteristics of large specific surface area, easy filming, and low price.

The utility model has carried out the experimental research of treating simulated domestic sewage, and the results show that: at a temperature of 25-29°C, when the wastewater COD concentration is 350-450mg/L, the ammonia nitrogen concentration is 30-35mg/L, and the total phosphorus concentration is 1.6-2.6mg/L, the hydraulic retention time of the device is 12 hours, the average removal rate of COD is 95.7%, the average removal rate of ammonia nitrogen is 97.1%, the average removal rate of total nitrogen is 51.4%, and the average removal rate of total phosphorus It is 63.5%, and the SS in the effluent is lower than 20mg/L, which meets the national urban domestic sewage secondary treatment primary discharge standard.

Claims (3)

1. a fluidized-bed---fixed bed integrated sewage treating apparatus, comprise a pond body (16), it is characterized in that installing additional in the described pond body (16) vertical dividing plate (15), pond body (16) is divided into 7 placed in-line reaction tanks (1-7), and the preceding reaction tank bottom in each adjacent reaction pond and top, afterreaction pond are interconnected; Wherein the 2nd, 3,5 and 6 reaction tanks are aerobic fluidized bed, the filling porous resilient support of part (14) in the pond, and reaction tank bottom one side is arranged aerating apparatus (10), the suspending carrier in the drive lower storage reservoir of air is fluidized state; 1st, 4 and 7 reaction tanks are fixed bed, fill up poroelasticity carrier (14) in the pond, and carrier is a stationary state; All reaction tanks (1-7) two ends are up and down respectively established a porous division board (13), each reaction tank (1-7) bottom is equipped with mud discharging mouth (11), water-in (8) is arranged at the first reaction tank top, and overflow weir (12) is arranged at the 1st, 3,5 and 7 reaction tank tops, and water port (9) is arranged at the 7th reaction tank top.

2. fluidized-bed according to claim 1---the fixed bed integrated sewage treating apparatus is characterized in that: described poroelasticity carrier (14) is a polyurethane material, and cube structure is suspended state in water after the biofilm.

3. fluidized-bed according to claim 1---the fixed bed integrated sewage treating apparatus is characterized in that: the volume filling ratio of described aerobic fluidized bed middle carrier is 26%-46%, and the volume filling ratio of carrier is 95%-100% in the described fixed bed.

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