CN201240972Y - Waste water advanced treatment apparatus combining ozone oxidation and downflow type aerating biological filter pool - Google Patents

Abstract

The utility model discloses a waste water advanced treatment device which combines ozone oxidation with a downflow type aerated biological filter tank. The device includes an ozone generation system, a gas-water mixing system, a heterogeneous ozone catalytic oxidation system and a downflow aerated biological filter. The heterogeneous ozone catalytic oxidation system consists of a gas-water mixed layer, a supporting cloth water plate, a heterogeneous catalytic oxidation packing layer, a steel wire mesh and a water outlet weir from bottom to top; the waste water injection port is located in the gas-water mixed layer, and the water outlet weir is connected to the The air-water mixing zone at the upper end of the downflow biological aerated filter is connected; the heterogeneous catalytic oxidation packing layer is formed by the accumulation of ceramsite loaded with manganese metal oxide series, with a height of 3-8m. The utility model realizes the two functions of ozone catalytic oxidation and biological aerated filter biochemistry in a combined reactor, reduces pumps and pipelines, occupies a small area, and the heterogeneous ozone catalytic oxidation system promotes ozone Decompose and protect the microorganisms in the biological aerated filter.

Description

Wastewater Advanced Treatment Device Combining Ozone Oxidation and Downflow Biological Aerated Filter

technical field

The utility model relates to the field of water treatment, in particular to the advanced treatment field of treating polluted raw water and waste water, especially waste water containing refractory biodegradable organic matter, by using an ozone catalytic oxidation-downflow type aerated biological filter integrated water treatment device.

Background technique

Ozone has extremely strong oxidizing properties, and its oxidizing ability is second only to fluorine, higher than chlorine and potassium permanganate. Based on the strong oxidizing properties of ozone, it can be decomposed in water in a short time without secondary pollution, so it is an ideal green oxidizing agent. At present, the application of ozone technology in the field of water treatment is increasing. Ozone not only has a strong disinfection and sterilization effect, but also can oxidize and remove pollutants that are difficult to biodegrade in water. However, if ozone is used alone to mineralize non-biodegradable pollutants into carbon dioxide and water for direct removal, the dosage of ozone is often large, the cost is too high, and the economy is poor, so it cannot be applied on a large scale in actual engineering. At the same time, the traditional ozone oxidation technology cannot effectively improve the ozone oxidation capacity, and the removal rate of refractory organic matter is also low. Therefore, catalytic oxidation of ozone to improve its oxidation capacity is also a current research hotspot.

The biological aerated filter (BAF) process is mainly used in the advanced treatment of low-concentration sewage and the pretreatment of micro-pollution of raw water, such as urban domestic sewage treatment, low-concentration industrial sewage treatment, raw water pretreatment of water supply, etc. It is a microbial contact growth system that removes biodegradable and usable dissolved substances through the absorption, degradation, oxidation, and synthesis of microorganisms attached to the filler. This method integrates the characteristics of the sewage treatment aeration tank and the water supply fast filter tank. The use of granular fillers with high specific surface area not only increases the microbial biomass, but also has high microbial activity, and at the same time makes the wastewater fully effective with the microorganisms on the surface of the filler. Ground contact, thus making the biological aerated filter have a higher treatment efficiency than the general traditional biological treatment technology. The biggest feature of the biological aerated filter is that it integrates biological oxidation and interception of suspended solids, saves the subsequent secondary sedimentation tank, and simplifies the treatment process on the premise of ensuring the treatment effect. In addition, the biological aerated filter process also has the characteristics of high organic matter volume load, large hydraulic load, short hydraulic retention time, low infrastructure investment, low energy consumption and operation cost, and high effluent quality. However, the biological aerated filter technology can only remove biodegradable organic matter, and the treatment effect on wastewater containing refractory organic matter is often not good. The removal of soluble and difficult-to-biodegrade pollutants is a difficult problem in the advanced treatment of sewage and the reuse of reclaimed water.

Utility model content

The purpose of the utility model device is to overcome the shortcomings of the existing technology in the treatment of wastewater containing refractory organic matter, to develop a method that not only maintains the strong ozone oxidation ability and the characteristics of biological oxidation and interception of suspended matter in the biological aerated filter, but also avoids the impact of ozone on exposure A wastewater advanced treatment device that combines ozone oxidation with a downflow biological aerated filter to interfere with the biological oxidation of the aerated biological filter and improve the biodegradability of its organic pollutants.

The principle of the utility model: use ozone heterogeneous catalytic oxidation, fill the device with ozone oxidation catalytic ceramsite, greatly improve the oxidation efficiency of ozone, and reduce the treatment cost of wastewater; through ozone catalytic oxidation, not only oxidize and decompose some organic matter, but more The most important thing is to improve the biodegradability of organic pollutants, and then the wastewater overflows into the downflow biological aerated filter, and the refractory organic matter after ozone oxidation treatment is finally removed by using the biological aerated filter treatment process.

The technical scheme that the utility model solves its technical problem adopts is:

A wastewater advanced treatment device that combines ozone oxidation with a downflow biological aerated filter, including an ozone generation system, an air-water mixing system, and a downflow biological aerated filter. The air-water mixing system includes sequentially connected delivery pumps, venturi pipe and wastewater injection port, the ozone generation system is connected with the Venturi tube; the wastewater advanced treatment device also includes a heterogeneous ozone catalytic oxidation system, which includes a gas-water mixed layer, a supporting cloth water plate, a non-homogeneous ozone catalytic oxidation system from bottom to top Homogeneous catalytic oxidation packing layer, steel wire mesh and water outlet weir; the waste water injection port is located in the gas-water mixing layer, and the water outlet weir is connected with the gas-water mixing area at the upper end of the downflow biological aerated filter; the heterogeneous catalytic oxidation packing layer It is formed by the accumulation of ceramsite loaded with manganese metal series. The ceramsite particle size is 2-8mm and the height is 3-8m.

In order to further realize the purpose of the utility model, the steel wire mesh is a stainless steel wire mesh with a specification of 10-20 mesh.

The downflow biological aerated filter includes an air-water mixing zone, a biological filler layer, a pressure-bearing layer, and a backwash air distribution and water layer in the tank body from top to bottom. Outlet.

The downflow biological aerated filter also includes a backwash system, the backwash system includes a backwash air pump, a backwash water pump, and a backwash outlet weir, and the backwash air pump and the backwash water pump are respectively connected to the backwash air distribution water layer, The backwash outlet weir is set on the upper part of the gas-water mixing zone.

The pressure-bearing layer is a steel plate or a cement board, and an ABS or stainless steel filter head is installed on the board.

The biological filler layer is formed by accumulating one of ceramsite, activated carbon, honeycomb ceramics, zeolite or volcanic rock particle fillers with a particle diameter of 1-10 mm.

A first valve and a flow meter are sequentially provided on the pipeline connecting the waste water inlet pump and the Venturi tube.

The supporting cloth water plate is a steel plate or a cement plate, and an ABS or stainless steel filter head is installed on the plate.

The cross-sectional area of the downflow biological aerated filter is 1.5-2.5 times the cross-sectional area of the heterogeneous ozone catalytic reaction system.

The utility model has the following advantages and positive effects:

(1) The utility model realizes the two functions of ozone catalytic oxidation and biological aerated filter biochemistry in a combined reactor, utilizes the suction force produced by the water inlet pump and the Venturi tube to inhale ozone into the ozone catalytic oxidation device, After the reaction, the waste water directly overflows into the downflow biological aerated filter by utilizing the height difference, and realizes combined treatment of ozone catalytic oxidation and biological aerated filter in one reactor. Reduce the trouble of pumping the ozonated water into the biological aerated filter; reduce the problem of unbalanced flow between pumps and pipelines, and between units, and the treatment system is compact and occupies a small area.

(2) There is no need to install an ozone destruction system after ozonation, because the ozone will pass through the packing layer filled with catalytic carriers, so there is basically no ozone residue in the tail gas. The residence time of ozone dissolved in wastewater in the entire ozone catalytic reactor is 1 to 3 hours, which is long enough compared to the half-life of ozone without catalysis of 15 to 20 minutes. At the same time, the downflow aerated biological filter By adjusting the height of the outlet pipe, the tank ensures that the air-water mixed layer on the upper part of the biological filler has a protective height of more than 1m, further decomposes and reduces the possible residual traces of ozone in the wastewater, and protects the microorganisms in the biological aerated filter.

Description of drawings:

Figure 1 is a schematic diagram of the overall structure of a wastewater advanced treatment device that combines ozone oxidation with a downflow biological aerated filter.

Fig. 2 is a schematic structural diagram of the heterogeneous ozone catalytic oxidation system and the downflow biological aerated filter in Fig. 1 .

Fig. 3 is a top view of a wastewater advanced treatment device combining ozone oxidation with a downflow biological aerated filter.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and examples, but the implementation of the utility model is not limited thereto.

As shown in Figures 1 and 2: The wastewater advanced treatment device combined with ozone oxidation and downflow biological aerated filter includes heterogeneous ozone catalytic oxidation system 8, ozone generation system 7, gas-water mixing system and downflow biological aerated filter pool9. The gas-water mixing system includes a delivery pump 1, a first valve 2, a flow meter 3, a Venturi tube 4, a second valve 5, and a waste water injection port 6 connected in sequence; the ozone generation system 7 is connected to the Venturi tube 4; the heterogeneous The ozone catalytic oxidation system 8 includes a gas-water mixing layer 11, a supporting cloth water plate 12, a heterogeneous catalytic oxidation packing layer 13, a steel wire mesh 1 and a water outlet weir 15 from bottom to top; the waste water injection port 6 is located in the gas-water mixing layer 11 Among them, the outlet weir 15 communicates with the air-water mixing zone 16 at the upper end of the downflow biological aerated filter. The ozone generating system 7 is connected to the Venturi tube 4, and the ozone enters the heterogeneous ozone catalytic oxidation system 8 through the Venturi tube. The wire mesh is stainless steel wire mesh. Ozone generation systems usually include air compressors, air dryers, pure oxygen generators and ozone generators. At present, medium and large ozone generation systems (with an ozone volume above 500g/h) all use this process to prepare ozone. There are complete sets of equipment, and therefore will not be described in detail.

The downflow biological aerated filter includes an air-water mixing zone 16, a biological filler layer 17, a pressure-bearing layer 18, and a backwash air distribution and water layer 19 from top to bottom in the tank body. A water outlet 10 is also provided. The biological filler layer is formed by accumulation of one of ceramsite, activated carbon, honeycomb ceramics, zeolite or volcanic rock particle filler, with a particle size of 1-10mm. The downflow biological aerated filter 9 also includes a backwashing system, the backwashing system includes a backwashing fan water pump system 21 and a backwashing outlet weir 20 for backwashing of the filter, the backwashing fan water pump system 21 and the backwashing air distribution The water distribution layer 19 is communicated with through pipelines, and the backwash outlet weir 20 is arranged on the air-water mixing area 16 . The waste water after backwashing is discharged back to the original regulating tank for waste water treatment through the backwashing outlet weir 20 .

At the same time, the wastewater advanced treatment device is also equipped with an ozone catalytic system maintenance manhole 22 and a downflow biological aerated filter system maintenance manhole 23, which are respectively located on the air-water mixing layer 11 and the backwash air distribution water layer 19, which is convenient for equipment regular inspection and maintenance.

As shown in Figure 3: the cross-sectional area of the downflow biological aerated filter is about 1.5-2.5 times the cross-sectional area of the heterogeneous ozone catalytic reaction system, and the specific size can be designed according to different water qualities.

The supporting layer of the heterogeneous ozone catalytic reaction system and the pressure-bearing layer of the downflow biological aerated filter are steel plates or reinforced concrete structures, and ABS or stainless steel filter heads are installed on the steel plates or reinforced concrete plates to distribute air and water .

When in use, ozone and waste water enter the gas-water mixing layer 11 through the injection port 6, and then rise through the supporting cloth water plate 12, so that the waste water and ozone react evenly in the heterogeneous catalytic oxidation packing layer 13, and the heterogeneous catalytic oxidation The filler layer is composed of ceramsite loaded with manganese metal series, the particle size is 2-8mm, the height is 3-8m, and the reaction time is guaranteed to be 30-60 minutes. The reaction effluent passes through the stainless steel wire mesh 14, the size of the steel mesh is 10-20 mesh, to ensure that the heterogeneous carrier is not discharged with the treated water, and at the same time remove the foam caused by the disturbance of gas and water, and the water is discharged through the outlet weir 15, and the overflow enters the downflow aeration Biofilter 9. First pass through the air-water mixing zone 16 to even out the water quality, then pass through the biological filler layer 17 for aerobic biodegradation, filter and remove suspended solids at the same time, then pass through the filter head of the pressure-bearing layer 18, and finally discharge the waste water up to the standard through the water outlet 10 or carry out reclaimed water Reuse.

The utility model can treat waste water alone, and can also be combined with other processes to treat waste water as a unit. Especially for the treatment of wastewater containing non-biodegradable organic matter, such as the advanced treatment of landfill leachate, the advanced treatment of general industrial wastewater as a water source for reuse, etc.

Claims (9)

1, ozone oxidation and the waste water advanced treatment unit of downflow type aerating biological filter bonded, comprise ozone generation system, air water mixing system and downflow type aerating biological filter, described air water mixing system comprises conveying water pump, Venturi tube and the waste water jet orifice that connects successively, and ozone generation system links to each other with Venturi tube; It is characterized in that: described waste water advanced treatment unit also comprises heterogeneous catalytic ozonation system, and this system comprises air water mixolimnion, support water distribution board, heterogeneous catalytic oxidation packing layer, woven wire and effluent weir from down to up; The waste water jet orifice is arranged in the air water mixolimnion, and effluent weir is communicated with the air water mixing zone of downflow type aerating biological filter upper end; Described heterogeneous catalytic oxidation packing layer by load the haydite of manganese metal oxide series pile up and to form, the haydite particle diameter is 2～8mm, highly is 3～8m.

2, ozone oxidation according to claim 1 and the waste water advanced treatment unit of downflow type aerating biological filter bonded, it is characterized in that: described woven wire is the stainless steel woven wire, specification is 10～20 orders.

3, ozone oxidation according to claim 1 and the waste water advanced treatment unit of downflow type aerating biological filter bonded, it is characterized in that: described downflow type aerating biological filter comprises air water mixing zone, biologic packing material layer, pressure bearing layer and back flushing gas distribution water distribution layer from top to bottom successively in the body of pond, also be provided with water outlet in back flushing gas distribution water distribution layer.

4, ozone oxidation according to claim 3 and the waste water advanced treatment unit of downflow type aerating biological filter bonded, it is characterized in that: described downflow type aerating biological filter also comprises back-purge system, back-purge system comprises back flushing air pump, backwash pump and back flushing effluent weir, back flushing air pump, backwash pump are communicated with back flushing gas distribution water distribution layer respectively, and the back flushing effluent weir is arranged on the top of air water mixing zone.

5, ozone oxidation according to claim 3 and the waste water advanced treatment unit of downflow type aerating biological filter bonded, it is characterized in that: described pressure bearing layer is steel plate or cement plate, and ABS or stainless steel filter head are installed onboard.

6, ozone oxidation according to claim 3 and the waste water advanced treatment unit of downflow type aerating biological filter bonded is characterized in that: described biologic packing material layer is that the haydite, gac, ceramic honey comb, zeolite of 1～10mm or volcanics granular filler are piled up and formed by particle diameter.

7, ozone oxidation according to claim 1 and the waste water advanced treatment unit of downflow type aerating biological filter bonded is characterized in that: described influent waste water is carried on water pump and the pipeline that Venturi tube is communicated with and is provided with first valve and under meter successively.

8, ozone oxidation according to claim 1 and the waste water advanced treatment unit of downflow type aerating biological filter bonded, it is characterized in that: described support water distribution board is steel plate or cement plate, and ABS or stainless steel filter head are installed onboard.

9, ozone oxidation according to claim 1 and the waste water advanced treatment unit of downflow type aerating biological filter bonded is characterized in that: the cross-sectional area of described downflow type aerating biological filter is 1.5-2.5 a times of heterogeneous ozone catalytic reactive system cross-sectional area.

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