CN204803073U - Dark bed filtering pond structure of denitrification - Google Patents

Abstract

The utility model discloses a be applied to a dark bed filtering pond structure of denitrification of sewage treatment plant advanced treatment, can realize sewage treatment's filtration, denitrified and aerated, the gas backwash, the air water backwash, washing and nitrogen gas release the function alone, the filter material metafiltration is expected into the high characteristic of solid filter material thing load and has been prolonged filtering pond filter run greatly, the back flush number of times has been reduced, dark bed filtering pond is filtered the operation filtering velocity and is more than denitrification operation filtering velocity, for single denitrification operational mode, satisfying under the prerequisite that the water index, whole average filtering velocity can suitably improve, filtering pond effective filtration area suitably reduces, construction cost reduction.

Description

A denitrification deep bed filter structure

technical field

The utility model relates to the structure of a deep-bed denitrification filter tank in a sewage treatment plant, which automatically controls the filtering and denitrification operation modes of the filter tank.

Background technique

The denitrification filter is mainly used to remove ammonia nitrogen in the sewage. Most of the denitrification filters provided abroad adopt a single denitrification mode. Generally, the residence time of the sewage in the filter is set or the nitrate nitrogen target of the effluent is set by setting Concentration, to control the operation of the entire filter system, considering the actual situation of China's sewage treatment, some special water quality, through the denitrification filter to filter out the flocs produced by chemical phosphorus removal, the denitrification filter is used as the guarantee of water quality Finally, to ensure the process, it is necessary to consider the simultaneous removal of suspended solids, ammonia nitrogen and total phosphorus indicators in sewage treatment. Most urban sewage treatment plants in my country implement the first-level A discharge standard, requiring the total nitrogen discharge concentration of the effluent to be less than 15mg/L, and the SS index of the effluent to be less than 10mg. /L, especially when the influent water quality fluctuates, it is necessary to achieve stable biological nitrogen and phosphorus removal and filtration functions.

On the basis of the traditional single denitrification filter mechanism, the above functions need to be realized. The denitrification deep bed filter needs to realize the functions of traditional filtration, denitrification, gas backwash, gas water backwash, separate water wash and nitrogen release.

Contents of the invention

A denitrification deep bed filter structure, which can realize the functions of water treatment filtration, denitrification, gas backwash, gas-water backwash, separate water wash and nitrogen release.

A denitrification deep bed filter structure, including water inlet pipe, water inlet valve, denitrification filter, outlet pipe, water outlet valve, water recoil pipe, water backwash valve, water backwash pump, gas recoil pipe, gas Backwash valve, air backwash fan, drain pipe, drain valve, wherein the water inlet valve is connected with the water inlet pipe, the water outlet valve is connected with the water outlet pipe, the water backwash valve is connected with the water backwash pipe, and the end of the water backwash pipe is connected with the water The backwash pump, the air backwash valve is connected to the air backwash pipe, the end of the air backwash pipe is connected to the air backwash fan, the water inlet pipe is installed on the upper part of the denitrification filter, the drain pipe is connected to the drain valve, and one end of the drain pipe is connected to the backwash fan. The top of the nitrification filter is connected, which is characterized in that the denitrification filter includes a filter material layer, a filter brick layer, and an outlet weir. The closed area of the opening constitutes the water inlet tank of the denitrification filter. The water inlet pipe is connected with the water inlet tank of the denitrification filter. At the bottom of the filter tank, the filter material layer covers the upper part of the filter brick layer.

The position of the drain pipe should be set at a height of 10-15CM higher than the top of the filter material layer.

The filter material in the filter material layer of the denitrification filter is quartz sand filter material with different particle sizes.

The height of the filter material layer of the denitrification filter is greater than 160CM.

The sewage to be treated enters the water inlet tank of the denitrification filter from the water inlet pipe, and the sewage entering the water inlet tank forms a uniform water inflow through the overflow weir, and the water passes through the filter material layer of the denitrification filter tank, and the pollutants will be trapped in the filter material layer , if it has the denitrification function, the quartz sand of the filter material in the filter layer is used as the film-hanging medium for denitrification organisms, and at the same time, the deep bed is an excellent removal structure for nitrate nitrogen (NO3-N) and suspended matter, so as to achieve sewage Purpose of processing.

As the suspended solids in the filter layer of the denitrification filter are continuously trapped, the head loss will increase, so backwashing is required to remove the trapped solids. Due to the high solids load and deep bed, high-intensity backwashing is required. Backwashing includes air backwashing, air-water backwashing and water backwashing in three forms.

Air backwash process: close the water inlet valve, water outlet valve, drain valve and water backwash valve, open the air backwash valve and air backwash fan to perform air backwash, and the air backwash process is accompanied by the nitrogen release process.

Air-water backwash process: close the water inlet valve, outlet valve and drain valve, open the air backwash valve, air backwash fan, water backwash valve and water backwash pump for air-water backwash, and wait until the water level of the denitrification filter reaches After setting the height, close the water backwash valve and air backwash valve. After the flushing is completed and the filter material layer is stable, open the drain valve to discharge the sewage water.

Water backwash process: close the water inlet valve, water outlet valve, drain valve, air backwash valve, air backwash fan, open the water backwash valve and water backwash pump for water backwash, and wait until the water level of the denitrification filter reaches the set value After the height is high, close the water backwash valve and air backwash valve. After the flushing is completed and the filter material layer is stable, open the drain valve to discharge or return the sewage water to the front-end sewage treatment process.

The utility model scheme has the following beneficial effects

1. The deep bed denitrification filter is a treatment unit that integrates biological denitrification and filtration functions.

2. The biological denitrification filter is a gravity flow filtration process, which has all the functions of a conventional filter, filters out suspended solids in the influent, and ensures that the discharge of suspended solids meets the standard.

3. The biological denitrification filter is developed from a deep bed filter. It is installed with a filter brick water distribution and gas distribution system and a coarse-grained quartz sand filter material. Microbes grow on the surface of the filter material, and a supplementary carbon source is added to the water as an electron supply. It is used by microorganisms in an anoxic environment to convert nitrate nitrogen into nitrogen gas in the influent, thereby achieving denitrification.

4. The high load of the filter material into solids greatly prolongs the filter cycle of the filter and reduces the number of backwashing.

5. The filtration speed of the deep bed filter is much higher than that of the denitrification operation. Compared with the single denitrification operation mode, the overall average filtration speed can be appropriately increased and the effective filtration area of the filter can be appropriately reduced under the premise of meeting the effluent index. Construction costs are reduced.

Description of drawings

Figure 1 A structure diagram of a deep bed filter denitrification filter

Detailed ways

A denitrification deep bed filter structure, comprising a water inlet pipe 1, a water inlet valve 2, a denitrification filter 3, an outlet pipe 5, an outlet valve 4, a water recoil pipe 8, a water backwash valve 6, and a water backwash pump 7. Air backwash pipe 11, air backwash valve 9, air backwash fan 10, drain pipe 16, drain valve 17, wherein the water inlet valve 2 is connected with the water inlet pipe 1, the water outlet valve 4 is connected with the water outlet pipe 5, and the water backwash Flush valve 6 is connected with water backwash pipe 8, the end of water backwash pipe 8 is connected with water backwash pump 7, air backwash valve 9 is connected with air backwash pipe 11, and the end of air backwash pipe is connected with air backwash fan 10 , the water inlet pipe 1 is installed on the top of the denitrification filter 3, the drain pipe 16 is connected to the drain valve 17, and one end of the drain pipe 16 communicates with the top of the denitrification filter 3, and it is characterized in that the denitrification filter 3 includes a filter material layer 12, The filter brick layer 13 and the outlet weir 15, wherein the height of the outlet weir 15 is at least 10 cm higher than the top of the water inlet pipe 1, and the closed area of the upper opening formed by the outlet weir 15 and the outer wall of the denitrification filter constitutes the denitrification filter inlet tank 14. The water pipe 1 communicates with the water inlet tank 14 of the denitrification filter, the filter brick layer 13, the filter brick structure communicates with the water outlet pipe 5, the water backwash pipe 8 and the gas backwash pipe 11, the filter brick layer 13 is fixed to the bottom of the denitrification filter 3, and The material layer 12 covers the upper part of the filter brick layer 13 .

The drainpipe 16 position should be arranged at the height of 10-15CM higher than the filter material layer 12 top.

The filter materials in the filter material layer 12 of the denitrification filter are quartz sand filter materials with different particle sizes.

The height of the filter material layer 12 of the denitrification filter is greater than 170 cm.

The sewage to be treated enters the water inlet tank 14 of the denitrification filter from the water inlet pipe 1, and the sewage entering the water inlet tank passes through the overflow outlet weir 15 to form a uniform water intake for the denitrification filter, and the water passes through the filter material layer 12 of the denitrification filter, polluting matter will be trapped in the filter material layer, if it has denitrification function, the quartz sand of the filter material in the filter material layer 12 is used as the film-hanging medium of denitrification organisms, and the deep bed is nitrate nitrogen (NO3-N) and suspended Excellent removal of structures to achieve the purpose of sewage treatment.

As the suspended solids in the filter layer 12 of the denitrification filter are continuously trapped, the head loss will increase, so backwashing is required to remove the trapped solids. Due to the high solids load and deep bed, high-intensity backwashing is required , backwashing includes air backwashing, air-water backwashing and water backwashing in three forms,

Gas backwash process: close water inlet valve 2, water outlet valve 4, drain valve 17 and water backwash valve 6, open gas backwash valve 9 and gas backwash fan 10 to perform gas backwash, and the gas backwash process is accompanied by nitrogen release process .

Air-water recoil process: close water inlet valve 2, water outlet valve 4 and drain valve 17, open air backwash valve 9, air backwash fan 10, water backwash valve 6 and water backwash pump 7 for air-water recoil, After the water level of the denitrification filter 3 reaches the set height, close the water backwash valve 6 and the air backwash valve 9, and after the flushing is completed and the filter material layer 12 is stabilized, open the drain valve 17 to discharge the sewage water.

Water recoil process: close water inlet valve 2, water outlet valve 4, drain valve 17, air backwash valve 9, air backwash fan 10, open water backwash valve 6 and water backwash pump 7 for water backwash, wait for backwash After the water level of the nitrification filter reaches the set height, close the water backwash valve 6 and the water backwash pump 7. After the flushing is completed and the filter material layer is stabilized, open the drain valve 17 to discharge or return the sewage water to the front-end sewage treatment process.

Claims (4)

1. A denitrification deep bed filter structure, comprising water inlet pipe (1), water inlet valve (2), denitrification filter tank (3), water outlet pipe (5), water outlet valve (4), water recoil pipe (8), water backwash valve (6), water backwash pump (7), air backwash pipe (11), air backwash valve (9), air backwash fan (10), drain pipe (16), The drain valve (17), wherein the water inlet valve (2) is connected with the water inlet pipe (1), the water outlet valve (4) is connected with the water outlet pipe (5), and the water backwash valve (6) is connected with the water backwash pipe (8) , the end of the water backwash pipe (8) is connected to the water backwash pump (7), the air backwash valve (9) is connected to the air backwash pipe (11), and the end of the air backwash pipe is connected to the air backwash fan (10) , the water inlet pipe (1) is installed on the top of the denitrification filter (3), the drain pipe (16) is connected to the drain valve (17), and one end of the drain pipe (16) communicates with the top of the denitrification filter (3). The denitrification filter (3) includes a filter material layer (12), a filter brick layer (13) and an outlet weir (15), wherein the outlet weir (15) is at least 10 cm higher than the top of the water inlet pipe (1), and the outlet weir (15) The closed area of the upper opening formed by the outer wall of the denitrification filter constitutes the water inlet tank (14) of the denitrification filter tank, and the water inlet pipe (1) communicates with the water inlet tank (14) of the denitrification filter tank, and the filter brick layer (13) The filter brick structure communicates with the water outlet pipe (5), the water backwash pipe (8) and the gas backwash pipe (11), the filter brick layer (13) is fixed on the bottom of the denitrification filter tank (3), and the filter material layer (12) covers On the filter brick layer (13) top. 2. The drainpipe (16) position described in a kind of denitrification deep bed filter structure according to claim 1 should be arranged on the height of 10-15cm higher than the filter material layer (12) top. 3. The filter material in the filter layer (12) of the denitrification deep bed filter structure according to claim 1 is quartz sand filter material with different particle sizes. 4. A denitrification deep bed filter structure according to claim 1, wherein the height of the filter material layer (12) of the denitrification filter is greater than 170cm.