CN201268654Y - Ozone disinfection and downflow type aerating biological filter integrated sewage treating device - Google Patents

Abstract

The utility model discloses an integrated sewage treatment device for ozone disinfection and a downstream aeration biological filter. The device includes an ozone generating device, a gas-water mixing device and a downflow biological aerated filter, and the ozone generating device is connected with a Venturi tube; the downflow biological aerated filter includes a gas-water mixing layer, a supporting The water distribution plate and the biological filler, the water inlet is set at the upper end of the downflow biological aerated filter, the water outlet is set at the air-water mixed layer; the circulating water inlet is located in the air-water mixed layer. Ozone and circulating water enter the air-water mixed layer through the Venturi tube, and the ozone kills the microorganisms in the wastewater, and the large amount of air brought in with the ozone acts as a gas for aerobic biochemical treatment in the downflow biological aerated filter. source effect. The utility model realizes the two functions of ozone disinfection and aerobic biochemistry of the aerated biological filter by using the oxygen in the ozone in a combined reactor, reduces pumps and pipelines, occupies a small area, and is economical and efficient.

Description

Ozone disinfection and downflow biological aerated filter integrated sewage treatment device

technical field

The utility model relates to the field of water treatment, in particular to a wastewater advanced treatment device combined with ozone disinfection and a downstream aerated biological filter to treat low-pollution wastewater or slightly polluted source water, so as to realize the integration of biochemical reaction and ozone disinfection.

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 reducing pollutants in water. Generally, ozone is generated by an ozone generator in a high-voltage discharge tube from oxygen. Only a small portion of the oxygen is converted to ozone, about 10-20% of the oxygen is converted to ozone. In the mixed gas containing ozone, if the strong bactericidal effect of ozone and the oxygen in it can be used, the oxygen can become the gas source of the downflow biological aerated filter. At the same time, the biological aerated filter is about four meters A high degree of biological filler is equivalent to the exhaust gas destroyer of ozone. In this way, one set of equipment can have multiple functions, which saves investment costs, improves the treatment effect, and reduces the occupied area.

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, less infrastructure investment, low energy consumption and operating costs, and high effluent quality. Most of the organic matter in the wastewater treated by the downflow biological aerated filter has been removed. In the lower part of the biological aerated filter, the wastewater is sterilized by ozone and can be directly discharged into the environment after treatment, which not only removes the waste water COD value, and good disinfection and sterilization effect.

Utility model content

The purpose of the utility model device is to utilize the ozone sterilizing effect in the ozone mixed gas, and make full use of the oxygen in the ozone mixed gas as the gas source of the downflow biological aerated filter. Combined wastewater advanced treatment device.

The principle of the utility model: the integrated system of ozone disinfection and downflow biological aerated filter is adopted. In the lower part of the biological aerated filter, the treated water flows through the gas-water mixing zone, and the waste water is removed in the upper biological packing layer. COD value, and has a better disinfection and sterilization effect in the lower part of the pool, making the effluent safer and more reliable.

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

An integrated sewage treatment device for ozone disinfection and downflow biological aerated filter, including an ozone generating device, a gas-water mixing device and a downflow biological aerated filter, the gas-water mixing device includes a delivery pump connected in sequence, a venturi tube And the circulating water inlet, the ozone generating device is connected with the Venturi tube; the downflow biological aerated filter includes the air-water mixed layer, the supporting cloth water plate and the biological filler from bottom to top, and the water inlet is set in the downflow aeration At the upper end of the biological filter, the water outlet is set in the air-water mixed layer; the circulating water inlet is located in the air-water mixed layer, and the biological filler is ceramsite with a particle size of 2-6mm and a height of 3-5m.

The downflow biological aerated filter also includes a backwash air device, and the backwash water pump of the backwash device communicates with the gas-water mixed layer of the downflow biological aerated filter through the fourth valve; The water mixing layer is connected, the backwash outlet weir is located at the upper end of the downflow biological aerated filter, and the backwash outlet weir is provided with a backwash outlet.

The downflow biological aerated filter also includes a maintenance manhole, which is arranged on the gas-water mixing layer.

The supporting water distribution and air distribution plate is a steel plate or reinforced concrete structure, and ABS plastic or stainless steel filter heads are installed on the steel plate or reinforced concrete plate.

The biological filler layer is formed by accumulating one of ceramsite, activated carbon, honeycomb ceramics, zeolite or volcanic rock particle filler, and the particle size is 2-6mm.

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

The utility model has the following advantages and positive effects:

(1) The utility model realizes two functions of ozone oxidation disinfection and biological aerated filter biochemistry in a combined reactor, utilizes the suction generated by the water inlet pump and the Venturi tube to inhale the ozone into the air-water mixing zone, The joint treatment of ozone disinfection and biological aerated filter is realized in one reactor. The problem of unbalanced flow between pumps and pipelines and units is reduced, and the processing system is compact and occupies a small area.

(2) Most of the organic matter in the wastewater treated by the downflow biological aerated filter has been removed. In the lower part of the biological aerated filter, the wastewater is sterilized by ozone and can be directly discharged into the environment after treatment. In addition to the COD value of wastewater, it also has a good disinfection and sterilization effect.

(3) Since the ozone tail gas passes through the packing layer filled with the adsorption carrier, there is basically no ozone residue in the tail gas, and it is not necessary to install an ozone destruction system. Ozone dissolved in wastewater stays in the clear water pool after the biological aerated filter for 1 to 3 hours, which is long enough compared to the half-life of ozone of 15 to 20 minutes. At the same time, the downflow biological aerated filter By adjusting the height of the outlet pipe, ensure that the air-water mixed layer on the upper part of the biological filler has a protective height of more than 1m, and further decompose and reduce the trace amount of ozone that may remain in the wastewater.

Description of drawings:

Figure 1 is a schematic structural diagram of an integrated sewage treatment device for ozone disinfection and downflow biological aerated filter.

Figure 2 is a schematic diagram of the structure of the downflow biological aerated filter and its backwashing system.

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 integrated sewage treatment device for ozone disinfection and downflow biological aerated filter includes an ozone generating device 7 , an air-water mixing device and a downflow biological aerated filter 8 . The gas-water mixing device includes a delivery pump 1, a first valve 2, a flow meter 3, a Venturi tube 4, a second valve 5 and a circulating water inlet 6 connected in sequence, and the circulating water inlet 6 is a jet inlet; the downflow biological aerated filter The pool 8 includes an air-water mixing layer 11, a supporting water-distributing air plate 12, a biological filler layer 13 and a steel wire mesh 14 from bottom to top; the circulating water inlet 6 is located in the air-water mixing layer 11; the ozone generator 7 and the Venturi The pipe 4 is connected, and the ozone enters the downflow biological aerated filter 8 through the Venturi tube. The water inlet 9 is set on the upper end of the downflow biological aerated filter tank, which is the normal water inlet of the whole system, that is, the waste water from other systems enters the tank body through the water inlet 9, and finally, after treatment and disinfection, it flows from the water outlet 20 Discharge treatment system. The biological filler layer is formed by the accumulation of ceramsite, the particle size of ceramsite is 2-6mm, and the height is 3-5m. Steel wire mesh 14 is stainless steel wire mesh. The treated effluent passes through the outlet 10 of the downflow biological aerated filter, flows through the water inlet pipe 18 of the clean water tank, and is discharged into the clean water tank 19 . Part of the water in the clear water tank is discharged through the water outlet 20 of the clear water tank, and the other part is passed through the circulating water outlet 21 and returned to the downflow biological aerated filter through the delivery pump 1 .

Ozone generators usually include air compressors, air dryers, pure oxygen generators and ozone generators (converting about 10-20% of oxygen into ozone). At present, medium and large ozone generators (more than 500g/h The amount of ozone) all use this process to prepare ozone, and there are complete sets of equipment, so no more details.

The downflow biological aerated filter 8 also includes a backwash fan water pump system 22 , and the backwash fan water pump system includes a backwash air pump 23 , a backwash water pump 24 , and a fourth valve 25 . The backwash water pump 24 communicates with the air-water mixing layer 11 of the downflow biological aerated filter tank 8 through the fourth valve 25 . The backwash air pump 23 is also in communication with the air-water mixing layer 11 . During backwashing, the water inlet 9 stops water intake, the third valve 17 is closed, the backwashing fan water pump system 22 is connected with the backwashing air distribution water layer 11 through pipelines, and the backwashing air and water pass through the backwashing fan water pump 22, backwashing water pump 22, backwashing The water and air distribution layer 11, the supporting water distribution and air distribution plate 12, the biological filler layer 13 and the steel wire mesh 14 are combined with air and water for backwashing. The backwash outlet weir 15 is located at the upper end of the downflow biological aerated filter 8 and the upper part of the steel wire mesh 14 . The backwash water outlet weir 15 is provided with a backwash water outlet 16 . The backwashed wastewater passes through the backwash outlet weir 15, and is discharged back to the original wastewater treatment adjustment tank through the backwash outlet 16.

The downflow biological aerated filter 8 also includes a maintenance manhole 26, which is arranged on the air-water mixing layer 11, so as to facilitate regular maintenance of the equipment.

The supporting water and air distribution plate 12 of the downflow biological aerated filter is a steel plate or reinforced concrete structure, and ABS plastic or stainless steel filter heads are installed on the steel plate or reinforced concrete plate to distribute air and water.

When in use, the waste water enters the downstream biological aerated filter through the water inlet 9, the ozone and circulating water enter the air-water mixed layer 11 through the circulating water inlet 6, and then the tail gas in the ozone gas rises through the supporting water distribution plate 12, Make the oxygen and other gases in the ozone tail gas evenly rise to the biological aerated filter, and react in the biological filler layer 13. The biological filler layer is composed of ceramsite with a particle size of 2-6mm and a height of 3-5m, ensuring The reaction time is 1-2 hours. The waste water flows downwards, undergoes aerobic biodegradation through the biological filler layer 13, and removes suspended solids by filtration at the same time, then passes through the filter head of the supporting cloth water distribution air plate 12, and then passes through the disinfection and sterilization effect of ozone in the air-water mixing layer 11, and finally The waste water is discharged up to the standard through the water outlet 10 or the reclaimed water is reused.

The utility model realizes the two functions of ozone disinfection and the aerobic biochemistry of the biological aerated filter by using the oxygen in the ozone in a combined reactor, reduces pumps and pipelines, and has a compact treatment system. Compared with separate use of ozone for disinfection And the waste water treatment device using the oxygen in the ozone to carry out the aerobic biochemistry of the biological aerated filter, the area occupied is reduced by 50%, and the economic cost is reduced by 30%. 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 hospital waste water and other waste water treatment occasions that contain microbial contamination risks.

Claims (6)

1. An integrated sewage treatment device for ozone disinfection and downflow biological aerated filter, including an ozone generating device, an air-water mixing device and a downflow biological aerated filter. inner pipe and circulating water inlet; it is characterized in that: the ozone generating device is connected with the Venturi pipe; the downflow biological aerated filter includes an air-water mixed layer, supporting cloth water board and biological filler from bottom to top, and the water inlet Set on the upper end of the downflow biological aerated filter, the water outlet is set in the air-water mixed layer; the circulating water inlet is located in the air-water mixed layer, the biological filler is ceramsite, the particle size is 2-6mm, and the height is 3-5m. 2. The integrated sewage treatment device for ozone disinfection and downflow biological aerated filter according to claim 1, characterized in that: the downflow biological aerated filter also includes a backwash wind device, and the backwash device The backwash water pump is connected with the air-water mixing layer of the downflow biological aerated filter through the fourth valve; A backwash outlet is provided on the flush outlet weir. 3. The wastewater treatment device combined with ozone oxidation and downflow biological aerated filter according to claim 1 or 2, characterized in that: the downflow biological aerated filter also includes maintenance manholes, which are arranged in the gas-water mixing layer superior. 4. The integrated sewage treatment device for ozone disinfection and downflow biological aerated filter according to claim 3, characterized in that: the supporting water distribution and air distribution plate is a steel plate or reinforced concrete structure, and the steel plate or reinforced concrete ABS plastic or stainless steel filter head is installed on the board. 5. The ozone disinfection and downflow biological aerated filter integrated sewage treatment device according to claim 1 or 2, characterized in that: the biological filler layer is filled with ceramsite, activated carbon, honeycomb ceramics, zeolite or volcanic rock particles One of the piles formed, the particle size is 2 ~ 6mm. 6. The integrated sewage treatment device for ozone disinfection and downflow biological aerated filter according to claim 1 or 2, characterized in that: the pipeline connecting the waste water inflow delivery pump and the Venturi tube is sequentially provided with the first A valve and a flow meter.

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