CN201292263Y - Vertical flow type aerobic gas float filter chamber - Google Patents

Abstract

The vertical flow air flotation filter belongs to a water treatment device. The utility model is characterized in that: the water inlet pipe and the dissolved air return pipe are fixed at the bottom of the filter, a dissolved air releaser is installed at the end of the dissolved air return pipe, a scum tank is arranged on the top of the filter, and a reverse filter is arranged at the lower part of the air flotation separation area. In the waste water tank, perforated air distribution pipes and water collection pipes are buried at the bottom of the filter material layer. The perforated air distribution pipes are connected with aeration and backwash air pipes, and the water collection pipes are connected with outlet pipes and backwash water inlet pipes. The device combines physical treatment (air flotation) and biological treatment (good air filter) to form an integrated device. Air flotation can further remove sludge fragments, colloidal particles, algae and other substances with a density close to water. At the same time, high dissolved oxygen in the water produced by air flotation provides biological oxygen demand for the aerobic filter. The aerobic filter physically intercepts pollutants, The function of adsorption and biodegradation, so as to further purify the water quality.

Description

Vertical flow air flotation filter

technical field

The utility model belongs to a water treatment device and relates to the fields of water source water treatment and sewage advanced treatment.

Background technique

At present, the advanced treatment of sewage and water source water generally adopt the conventional process of coagulation + sedimentation + filtration. Although this process can effectively remove suspended solids, BOD, COD and other pollutants in the water, nutrients such as nitrogen and algae in the effluent The indicators cannot meet the corresponding water quality standards, and the process occupies a large area and the management is complicated.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the conventional technology and provide a new type of water treatment device. The device combines physical treatment (air flotation) and biological treatment (good air filter) to form an integrated device. Air flotation can further remove sludge fragments, colloidal particles, algae and other substances with a density close to water. At the same time, high dissolved oxygen in the water produced by air flotation provides biological oxygen demand for the aerobic filter. The aerobic filter physically intercepts pollutants, The function of adsorption and biodegradation, so as to further purify the water quality.

The technical scheme of the utility model is as follows:

The vertical flow type air flotation filter relates to an improvement of the structure of the floating filter, which is based on the traditional flat flow floating filter and is improved into a vertical flow type while adding an aeration device to improve the biological treatment function.

The vertical flow type air flotation filter of the utility model is characterized in that: the water inlet pipe 1 and the dissolved air return pipe 2 are fixed at the bottom of the filter, a dissolved air releaser 8 is installed at the end of the dissolved air return pipe 2, and a floating filter is installed on the top of the filter. The slag tank 6 is provided with a backwash wastewater tank 7 at the bottom of the air flotation separation zone 12, and a perforated air distribution pipe 9 and a water collection pipe 10 are buried at the bottom of the filter material layer 13, wherein the perforated air distribution pipe 9 is connected with the aeration and backwash air pipe 5, and the collection The water pipe 10 is connected with the water outlet pipe 3 and the backwash water inlet pipe 4 .

Compared with the existing water treatment device, this device has the following advantages:

1. Compared with the sedimentation tank, the air flotation tank used in this device is easy to remove suspended sludge fragments, colloidal particles and algae substances that are difficult to coagulate and settle in the secondary effluent, and at the same time, dissolve air and oxygenate the effluent, which is beneficial to the follow-up Biochemical reactions in an aerobic filter.

2. This device adopts an aerated filter similar to the aerated biological filter, but the aerated filter emphasizes the filtering effect. At the same time, on the premise of maintaining the original filtration and turbidity removal function of the ordinary fast filter, an aeration device is added to strengthen its biological Function, enhance the removal effect of the filter on organic matter and ammonia nitrogen and other indicators.

3. Compared with the vertical flow type, this device adopts vertical flow type, which has high surface load and small floor space. The slag scraping equipment has little influence on the separation area, and the effluent quality is high.

4. The air flotation tank and the good air filter are combined into one, with reasonable design, compact structure, and convenient management and use.

Description of drawings

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

Detailed ways

The specific operation is as follows:

1. Air flotation filtration process: water inlet pipe 1 comes from the effluent of flocculation reaction, and dissolved air return pipe 2 comes from the effluent of the floating filter through the air-liquid mixing pump to dissolve air water (dissolved air pressure 392kPa, reflux ratio 40%) , the two enter the air flotation contact zone 11 from the bottom of the pool together, and the ascending flow rate is 11mm/S. After flocculation, the flocs and dissolved air water collide with the bubbles released by the releaser 8 to form a bubble-floc combination. The two rise to the air flotation separation zone 12 for separation. The slag overflows into the scum tank 6 and discharges, and the air flotation effluent passes through the filter material layer 13 of the filter tank. The filtration rate is 4m/h, and there are physical retention and adsorption in the filter material layer, and the high dissolved oxygen in the air flotation water is Biodegradation provides an aerobic environment, oxygen insufficient for nitrification reaction is supplemented by the aeration pipe 5, and evenly distributed in the filter layer through the perforated air distribution pipe 9, the aeration rate is controlled at 100L/h, and finally the effluent is collected by the water collection pipe 10 and passed through the outlet pipe 3 flow out.

2. The backwashing process of the air flotation filter: When the maximum water head loss of the filter exceeds 1m, the filtration cycle of the filter is over, and backwashing is required to ensure the normal water discharge of the device. The backwashing process adopts air-water combined backwashing: the backwashing air pipe 5 comes from the aeration system, the backwashing water pipe 4 comes from the filtered water for pressurized delivery or provided by the high-level water tank, and the backwashing waste water is discharged through the waste water tank 7. The backwashing parameters are: single air flushing intensity 11.1L/m ² ·s, flushing 3min; combined air flushing intensity 11.1L/m ² ·s, water flushing intensity 4.5L/m ² ·s, flushing 6min; water rinsing intensity 8.9 L/m ² ·s, rinse time 5min.

It can be seen from Table 1 that through the integrated device of the vertical flow air flotation filter, the water quality of the secondary effluent has been greatly improved. Except for the bacteria index that needs to be disinfected, other indicators have reached the water quality index of the reclaimed water.

The water quality and removal rate of the secondary effluent of the sewage plant and the effluent treated by the vertical flow air flotation filter are shown in Table 1:

index Turbidity/NTU Chromaticity/degree UV ₂₅₄ /cm ^-1 COD/mg/L NH ₃ -N/mg/L TP/mg/L Total number of bacteria/10 ⁴ ·ml ^-1 Secondary outlet 4-15 100-150 0.12-0.27 50-80 15-70 1-5 13-22 Good air flotation filter water 0.5-2.6 29.7-51.7 0.03-0.17 22.5-35.2 0.4-15 0-0.8 3.9-6.1 Removal rate (%) 78 65 46 47 80 83 63

Claims (1)

1. vertical-flow good Airfloat filtering pond, it is characterized in that: water inlet pipe, molten gas backflow water pipe are fixed on this bottom, filter tank, end at molten gas backflow water pipe is installed dissolved air release, this top, filter tank is provided with the scum silica frost groove, in the bottom, flotation separation zone the backwash waste groove is set, bury perforation gas distribution pipe and header underground in the filter material layer bottom, its middle punch gas distribution pipe is connected with aeration, backwash tracheae, and header is connected with rising pipe and backwash water inlet pipe.

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