CN212246397U - Novel denitrification filter device based on organic polymer carrier - Google Patents
Novel denitrification filter device based on organic polymer carrier Download PDFInfo
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Abstract
The utility model discloses a novel denitrification filtering pond device based on organic polymer carrier, including filtration system and back flush system, from last organic polymer carrier precoat, quartz sand filter layer, bearing layer and filter brick layer down piling up in proper order in the filtering pond body in the novel denitrification filtering pond device, wherein organic polymer carrier precoat and quartz sand filter layer combine be the multilayer precoat. The utility model discloses a water distribution nozzle stub is intake, can effective uniform water distribution, avoids conventional denitrification filtering pond water distribution in-process to form the drop simultaneously, sneaks into dissolved oxygen, causes throwing of extra carbon source to be favorable to practicing thrift the working costs.
Description
Technical Field
The utility model relates to a water treatment method and equipment technical field, in particular to a novel denitrification filter tank device based on an organic polymer carrier.
Background
In recent years, the latest published national discharge standards of pollutants for municipal wastewater treatment plants (draft of comments) by the ministry of environmental protection newly adds relevant indexes of special discharge limit values, the main indexes refer to the indexes of IV-class water in the environmental quality standards for surface water (GB3838-2002), local standards are successively released in areas such as Beijing, Tianjin, Guangdong, Jiangsu, Zhejiang and the like, and relevant work of extracting standard IV-class water is successively carried out. The discharge index of the quasi-IV water standard has more strict requirements than the discharge standard of pollutants for municipal wastewater treatment plants (GB18918-2002), wherein the total nitrogen limit value is 10mg/L, and the total phosphorus limit value is 0.3 mg/L. Therefore, how to strengthen the town sewage treatment process becomes the technical research focus in the field.
In the prior art, the deep bed denitrification filter tank has the functions of simultaneously performing deep denitrification and filtering sewage, and is one of important processes for deep treatment of sewage. The common deep bed denitrification filter tank comprises a tank body, a filter material layer, a filter material supporting layer, a water and gas distribution system for back washing, a carbon source adding system and the like; through the steps of water inlet after primary purification, air-water backwashing, independent water washing for removing nitrogen and the like, SS (suspended matter)/TN (total nitrogen)/TP (total phosphorus) is removed, and SS, TN and TP effluent in the treated water reaches the discharge standard of pollutants for municipal wastewater plants. Wherein, the filter material layer in the deep bed denitrification filter tank is generally single-layer or multi-layer quartz sand and sea sand, and denitrification organisms are attached to the quartz sand and the sea sand; the total height of the filter media in a deep bed denitrification filter is typically in excess of 1.8m to avoid cross flow or breakthrough phenomena.
The technical scheme has the following problems: 1. quartz sand and sea sand are used as a filter material layer, the specific surface area is small, denitrification biofilm formation is less, the load of denitrification capacity is low, and TN with low concentration needs to be ensured when water enters; 2. the total height of the filter medium in the deep bed denitrification filter tank is about 1.8m, and strong backwashing is needed; during back flushing, the flushing strength is not easy to control: if the washing strength is insufficient, the washing is not clean, and the packing is easy to harden for a long time; if the washing strength is high, the filter material composing the filter material layer is easy to run off and the denitrification biomembrane falls off, so that the domesticated denitrification biological flora is reduced or destroyed, and the water outlet stability and the water outlet effect of the filter tank are influenced finally; and 1.8m deep media in the deep bed denitrification filter tank can cause great head loss and high energy consumption.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model aims to solve the problem of providing a novel denitrification filter device based on an organic polymer carrier, which overcomes the defects of smaller specific surface area of a filter material layer, less denitrification biofilm formation and lower denitrification capacity load in the prior art; the total height of the filter medium in the deep bed denitrification filter tank is about 1.8m, and the washing strength is not easy to control during back washing.
Technical scheme
For solving the technical problem, the utility model provides a novel denitrification filtering pond technology based on organic polymer carrier, its characterized in that: the method comprises the following steps:
(1) closing the electric valve D2 of the backwash water inlet pipe, the electric valve D3 of the backwash air pipe, the electric valve D4 of the backwash water outlet pipe and the drainage flap valve 14, filtering sewage to adjust a carbon source, and then entering the water inlet channel 02;
(2) opening a water inlet valve 03, distributing filtered sewage into a water distribution channel 04, then entering a filter tank body 01 through a plurality of water distribution short pipes 05 uniformly distributed below the water distribution channel 04), sequentially permeating water flow in the filter tank body 01 through a multi-layer filter material layer, a supporting layer 08 and a filter brick layer 09 combined by an organic polymer carrier filter material layer 06 and a quartz sand filter layer 07 in a gravity flow mode, then entering a water outlet channel 10 through a gap of the filter brick layer 09, opening an electric valve D1 of a water outlet pipe, and allowing the treated filtered sewage to flow into a clean water tank through the water outlet pipe 11;
(3) during backwashing, the water level of the filter tank body 01 is reduced to the set lowest water level, the electric valve D1 of the water outlet pipe is closed, the electric valve D2 of the backwashing water inlet pipe and the electric valve D3 of the backwashing air pipe are opened to carry out combined air-water backwashing, the water level in the filter tank body 01 is stopped when reaching the maximum allowable value of the water level set by the filter tank body 01, and the electric valve D4 of the backwashing water outlet pipe is opened after tens of seconds.
The utility model discloses further preferred scheme does: the water inflow in the water distribution short pipes 05 in the step 2 is the same, and the opening degree of the electric valve D1 of the water outlet pipe is adjusted according to the water level change above the multi-layer filter material layer in the filter tank body 01. The resistance of the valve is gradually reduced to overcome the increased head loss in the filtering layer, so that the filtering water level is stable in the filtering period, and the filter can filter under the condition of constant head.
The utility model discloses further preferred scheme does: the supporting layer 08 in the step 2 is a pebble layer.
The utility model discloses further preferred scheme does: in step 3, the drainage flap valve 14 is provided with two control points of 50% opening degree and 100% opening degree, when the back washing is started, the electric valve D4 of the back washing water outlet pipe is in a closed state, and the washing water flow washes a filter material medium layer consisting of an organic polymer carrier filter material layer 06, a quartz sand filter layer 07, a supporting layer 08 and a filter brick layer 09 from bottom to top; when the backwashing water flow rises to the set highest water level, closing the electric valve D2 of the backwashing water inlet pipe or stopping the pump of the backwashing water pump, gradually opening the drainage flap valve 14 after 20-30 s, firstly opening the drainage flap valve by 50% of opening degree, then opening the drainage flap valve by 100% of opening degree, after 60-80 s, lowering the water level above the multi-layer filter material layer to the edge of the drainage flap valve 14, closing the drainage flap valve 14, starting another backwashing, and repeating the operation for 2-3 times; and when the water level is reduced to the bottom end of the drainage flap valve 14 for the last time, closing the electric valve D3 of the backflushing air pipe, and flushing with water. And after the washing is finished, closing the electric valve D2 of the backwashing water inlet pipe, the drainage flap valve 14 and the electric valve D4 of the backwashing water outlet pipe, and opening the electric valve D1 of the water outlet pipe to start the filtration in the next period.
Another subject is: the utility model provides a novel denitrification filtering pond device based on organic polymer carrier, includes filtration system and back flush system, its characterized in that: an organic polymer carrier filter material layer 06, a quartz sand filter layer 07, a supporting layer 08 and a filter brick layer 09 are sequentially stacked in a filter tank body 01 in the novel denitrification filter tank device from top to bottom, wherein the organic polymer carrier filter material layer 06 and the quartz sand filter layer 07 are combined to form a multi-layer filter material layer; a plurality of water distribution short pipes 05 are uniformly distributed below the water distribution channel 04 in the filter tank body 01, one ends of the water distribution short pipes 05 extend into the lower portion of the liquid level in the filter tank body 01, the other ends of the water distribution short pipes are connected with the water distribution channel 04, and the water distribution channel 04 is communicated with the water inlet channel 02.
The further preferred scheme is as follows: the filter tank body 01 is a plug flow type reactor and is subjected to downward flow filtration reaction, the cross section of the filter tank body 01 is rectangular or circular, and the filter tank body 01 is of a steel concrete structure or a steel structure.
The further preferred scheme is as follows: the filter brick layer 09 is assembled by a plurality of filter bricks to form, a plurality of air branch pipes are uniformly distributed at the bottom of the filter brick layer 09, air holes are respectively formed in each air branch pipe, one end of each air branch pipe is communicated with one end of a corresponding air main pipe, each air main pipe is uniformly distributed on the inner wall of the bottom of the filter tank, and the other end of each air main pipe extends out of the filter tank.
The further preferred scheme is as follows: the bearing layer 08 is a multi-level graded pebble layer, the particle size of pebbles of the pebble layer is 3-20 mm, and the layer height of the pebble layer is 0.35-0.45 m.
The further preferred scheme is as follows: the lower layer of the multi-layer filter material layer is a quartz sand filter layer 07, and the density of the quartz sand filter layer 07 is 2.5-2.7 g/cm3D10 is 0.9-1.2 mm, K80 is less than 1.4, and the thickness is 800-1000 mm; the upper layer of the multi-layer filter material layer is an organic polymer carrier filter material layer 06, the particle size of the organic polymer carrier filter material layer 06 is 3-5 mm, the layer height of the organic polymer carrier filter material layer 06 is 400-600 mm, the organic polymer carrier filter material layer 06 is subjected to special biological affinity treatment, the surface of the organic polymer carrier filter material layer 06 forms a scale-shaped and microporous structure, and the density of the organic polymer carrier filter material layer 06 is 1.05-1.1 g/cm3。
The further preferred scheme is as follows: and the device also comprises a PLC control system connected with the filtering system and the backwashing system.
The beneficial effects are that: the utility model discloses a water distribution nozzle stub is intake, can effective uniform water distribution, avoids conventional denitrification filtering pond water distribution in-process to form the drop simultaneously, sneaks into dissolved oxygen, causes throwing of extra carbon source to be favorable to practicing thrift the working costs.
The height of the filter material medium layer is lower than that of the conventional denitrification filter, the loss of a filter head is reduced, the total height of the filter is reduced, and the investment is reduced.
The organic polymer carrier filter material layer is a porous hydrophilic substance, is easy to form a membrane, can retain more denitrification biomembranes, has the denitrification load 5-10 times higher than that of the conventional quartz sand filter, and plays a role in filtration and interception.
The density of the organic polymer carrier filter material layer is greatly different from that of quartz sand, no disordered layer is generated in the back washing process, the organic layer is in a fluidized state during back washing, filtered suspended matters are easy to discharge, excessive friction among the filter materials is avoided, effective biomembrane falling is avoided, the biomembrane is retained after back washing, and the denitrification effect is stable during secondary filtering.
Due to the adoption of a lower filter layer and a light filter material, the backwashing strength is reduced by about 30-40% compared with that of the conventional denitrification filter, the backwashing time is saved by 30-40%, and the effects of energy conservation and consumption reduction are obvious. In addition, the conventional denitrification filter requires frequent water back flushing to remove nitrogen generated by denitrification. The utility model discloses because denitrification concentrates with upper light filter material, produce easily the desorption in the nitrogen gas filtering process, avoid frequent water-washed denitrogenation, energy saving and consumption reduction effect is obvious.
Drawings
Fig. 1 is a schematic diagram of the novel denitrification filter device based on organic polymer carriers.
Wherein, 01 is a filter tank body, 02 is an inlet channel, 03 is an inlet valve, 04 is a water distribution channel, 05 is a water distribution short pipe, 06 is an organic polymer carrier, 07 is a quartz sand filter layer, 08 is a supporting layer, 09 is a filter brick, 10 is an outlet channel, 11 is an outlet pipe, 12 is a backwashing inlet pipe, 13 is a backwashing air pipe, 14 is a flap valve, 15 is a backwashing channel, 16 is a backwashing drain pipe, D1 is an outlet pipe electric valve, D2 is a backwashing inlet pipe electric valve, D3 is a backwashing air pipe electric valve, and D4 is a backwashing drain pipe electric valve.
Detailed Description
The following describes the present invention in further detail with reference to examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The utility model discloses a novel denitrification filtering pond technology based on organic polymer carrier, including following step:
(1) closing the electric valve D2 of the backwash water inlet pipe, the electric valve D3 of the backwash air pipe, the electric valve D4 of the backwash water outlet pipe and the drainage flap valve 14, filtering sewage to adjust a carbon source, and then entering the water inlet channel 02;
(2) opening a water inlet valve 03, distributing filtered sewage into a water distribution channel 04, then entering a filter tank body 01 through a plurality of water distribution short pipes 05 uniformly distributed below the water distribution channel 04, sequentially permeating water flow in the filter tank body 01 through a multi-layer filter material layer, a supporting layer 08 and a filter brick layer 09 combined by an organic polymer carrier filter material layer 06 and a quartz sand filter layer 07 in a gravity flow mode, then entering a water outlet channel 10 through a gap of the filter brick layer 09, opening an electric valve D1 of a water outlet pipe, and allowing the treated filtered sewage to flow into a clean water tank through the water outlet pipe 11;
(3) during backwashing, the water level of the filter tank body 01 is reduced to the set lowest water level, the electric valve D1 of the water outlet pipe is closed, the electric valve D2 of the backwashing water inlet pipe and the electric valve D3 of the backwashing air pipe are opened to carry out combined air-water backwashing, the water level in the filter tank body 01 is stopped when reaching the maximum allowable value of the water level set by the filter tank body 01, and the electric valve D4 of the backwashing water outlet pipe is opened after tens of seconds.
Preferably, the water inflow in the water distribution short pipes 05 in the step 2 is the same, and the opening degree of the electric valve D1 of the water outlet pipe is adjusted according to the water level change above the multi-layer filter material layer in the filter tank body 01. The resistance of the valve is gradually reduced to overcome the increased head loss in the filtering layer, so that the filtering water level is stable in the filtering period, and the filter can filter under the condition of constant head.
Preferably, the bearing layer 08 in step 2 is a pebble layer.
Preferably, in the step 3, the drainage flap valve 14 is provided with two control points of 50% opening degree and 100% opening degree, when the back washing is started, the electric valve D4 of the back washing water outlet pipe is in a closed state, and the washing water flows wash the filter material medium layer consisting of the organic polymer carrier filter material layer 06, the quartz sand filter layer 07, the support layer 08 and the filter brick layer 09 from bottom to top; when the backwashing water flow rises to the set highest water level, closing the electric valve D2 of the backwashing water inlet pipe or stopping the pump of the backwashing water pump, gradually opening the drainage flap valve 14 after 20-30 s, firstly opening the drainage flap valve by 50% of opening degree, then opening the drainage flap valve by 100% of opening degree, after 60-80 s, lowering the water level above the multi-layer filter material layer to the edge of the drainage flap valve 14, closing the drainage flap valve 14, starting another backwashing, and repeating the operation for 2-3 times; and when the water level is reduced to the bottom end of the drainage flap valve 14 for the last time, closing the electric valve D3 of the backflushing air pipe, and flushing with water. And after the washing is finished, closing the electric valve D2 of the backwashing water inlet pipe, the drainage flap valve 14 and the electric valve D4 of the backwashing water outlet pipe, and opening the electric valve D1 of the water outlet pipe to start the filtration in the next period.
A novel denitrification filter device based on organic polymer carriers comprises a filtering system and a backwashing system, wherein an organic polymer carrier filter material layer 06, a quartz sand filtering layer 07, a supporting layer 08 and a filter brick layer 09 are sequentially stacked in a filter tank body 01 in the device from top to bottom, wherein the organic polymer carrier filter material layer 06 and the quartz sand filtering layer 07 are combined to form a multi-layer filter material layer; a plurality of water distribution short pipes 05 are uniformly distributed below the water distribution channel 04 in the filter tank body 01, one ends of the water distribution short pipes 05 extend into the lower portion of the liquid level in the filter tank body 01, the other ends of the water distribution short pipes are connected with the water distribution channel 04, and the water distribution channel 04 is communicated with the water inlet channel 02. Water is fed through the water distribution short pipe 05, so that water can be distributed uniformly, and meanwhile, the phenomenon that the additional carbon source is added due to the fact that water drop is formed in the water distribution process of the conventional denitrification filter tank and dissolved oxygen is mixed is avoided, and the operation cost is saved. And the integral height of the filter tank body 01 is lower than that of the conventional denitrification filter tank, so that the filter head loss is reduced, the total height of the filter tank is reduced, and the manufacturing cost is reduced.
Preferably, the filter tank body 01 is a plug flow type reactor, downward flow filtration reaction is carried out, the cross section of the filter tank body 01 is rectangular or circular, and the filter tank body 01 is of a steel concrete structure or a steel structure.
Preferably, the filter brick layer 09 is formed by assembling a plurality of filter bricks, a plurality of air branch pipes are uniformly distributed at the bottom of the filter brick layer 09, air holes are respectively formed in the air branch pipes, one end of each air branch pipe is communicated with one end of a corresponding air main pipe, each air main pipe is uniformly distributed on the inner wall of the bottom of the filter tank, and the other end of each air main pipe extends out of the filter tank.
Preferably, the supporting layer 08 is a multi-level graded pebble layer, the particle size of pebbles of the pebble layer is 3-20 mm, and the layer height of the pebble layer is 0.35-0.45 m.
Preferably, the lower layer of the multi-layer filter material layer is a quartz sand filter layer 07, and the density of the quartz sand filter layer 07 is 2.5-2.7 g/cm3D10 is 0.9-1.2 mm, K80 is less than 1.4, and the thickness is 800-1000 mm; the upper layer of the multi-layer filter material layer is an organic polymer carrier filter material layer 06, the particle size of organic polymer carriers of the organic polymer carrier filter material layer 06 is 3-5 mm, the layer height of the organic polymer carrier filter material layer 06 is 400-600 mm, the organic polymer carrier filter material layer 06 is subjected to special biological affinity treatment, the surface of the organic polymer carrier filter material layer 06 forms a scale-shaped and microporous structure, and the density of the organic polymer carrier filter material layer 06 is 1.05-1.1 g/cm 3. The organic polymer carrier filter material layer 06 is a porous hydrophilic substance, is easy to form a membrane, can retain more denitrification biomembranes, has the denitrification load 5-10 times higher than that of a conventional quartz sand filter, and plays a role in filtration and interception. And the density of the organic polymer carrier filter material layer 06 is greatly different from that of quartz sand, no disordered layer is generated in the back washing process, the organic layer is in a fluidized state during back washing, filtered suspended matters are easy to discharge, excessive friction among filter materials is avoided, effective biomembrane falling is caused, the biomembrane is retained after the back washing, and the denitrification effect is stable during secondary filtering.
Due to the adoption of a lower filter layer and a light filter material, the backwashing strength is reduced by about 30-40% compared with that of the conventional denitrification filter, the backwashing time is saved by 30-40%, and the effects of energy conservation and consumption reduction are obvious.
The conventional denitrification filter tank needs frequent water back flushing to remove nitrogen generated by denitrification. The utility model discloses because denitrification is concentrated with upper light filter material, produce easily the desorption in the nitrogen gas filtering process, avoid frequent water-washed denitrogenation, energy saving and consumption reduction effect is obvious.
Preferably, the device also comprises a PLC control system connected with the filtering system and the backwashing system.
Preferably, the bottom of the filter pool body 01 is provided with a water distribution gallery which is used for distributing water as backwashing water and draining filtered water collected in a filtering process, the top end of the water distribution gallery is communicated with the bottom of the filter brick layer, and the other end of the water distribution gallery is connected with a backwashing water pump and a water outlet pipe 11 at the same time and is switched by D1 and D2;
preferably, the backwashing drainage of the filter tank body 01 consists of a drainage flap valve 14 and a drainage channel, and the drainage flap valve 14 is arranged on the side wall of the drainage channel and is 300mm away from the filter material layer.
Controlling the filtering speed to be 4-10 m/h according to the inlet water turbidity, wherein the SS of outlet water is less than 5 mg/L; air washing strength is 16-17L/(m)2S) for 3-4 min; air strength of air washed by air and water at the same time is 16-17L/(m)2S) water washing strength of 4-5L/(m)2S) for 4-5 min; washing with 15-16L/(m) of water2S). Organic carrier denitrification load 2-4 kgNO3-N/(m3·d)。
According to the C/N ratio of the influent water quality, a carbon source adding system is matched as necessary to supplement the denitrification necessary carbon source for the system.
The example is carried out in a sewage treatment plant in a certain town of Zhejiang, and the sewage used in the experiment is taken from the effluent of a primary sedimentation tank of the sewage treatment plant. Organic carrier denitrification load 2kgNO3-N/(m3D), the filtering speed is 4m/h, the supporting layer is a pebble layer with the thickness of 0.4m, the filter material layer is a multi-layer filter material layer, the thickness of the lower quartz sand filter layer is 1000m, the thickness of the upper organic polymer filter material layer is 0.6m, and the average water inlet and outlet quality is shown in the following table:
| basic control items | Quality of inlet water (mg/L) | Effluent water quality (mg/L) |
| Chemical oxygen demandAmount (COD)Cr) | 143.4 | 10.75 |
| Biochemical Oxygen Demand (BOD)5) | 61.8 | 3.09 |
| Suspended Substance (SS) | 182.72 | 18.32 |
| Total nitrogen (in N) | 40.63 | 7.63 |
| Ammonia nitrogen (in N) | 34.37 | 1.29 |
| Total phosphorus (in terms of P) | 4.38 | 0.54 |
As described above, the above embodiments are not limiting embodiments of the present invention, and modifications or equivalent variations made by those skilled in the art based on the substance of the present invention are within the technical scope of the present invention.
Claims (6)
1. The utility model provides a novel denitrification filtering pond device based on organic polymer carrier, includes filtration system and back flush system, its characterized in that: an organic polymer carrier filter material layer (06), a quartz sand filter layer (07), a bearing layer (08) and a filter brick layer (09) are sequentially stacked in a filter tank body (01) in the novel denitrification filter tank device from top to bottom, wherein the organic polymer carrier filter material layer (06) and the quartz sand filter layer (07) are combined to form a multi-layer filter material layer; a plurality of short water distribution pipes (05) are uniformly distributed below the water distribution channel (04) in the filter pool body (01), one end of each short water distribution pipe (05) extends into the position below the liquid level in the filter pool body (01), the other end of each short water distribution pipe is connected with the water distribution channel (04), and the water distribution channel (04) is communicated with the water inlet channel (02).
2. The novel denitrification filter tank device based on the organic polymer carrier as claimed in claim 1, wherein: the filter tank body (01) is a plug flow type reactor and is subjected to downward flow filtration reaction, the cross section of the filter tank body (01) is rectangular or circular, and the filter tank body (01) is of a steel concrete structure or a steel structure.
3. The novel denitrification filter tank device based on the organic polymer carrier as claimed in claim 1, wherein: filter brick layer (09) assemble by the polylith filter brick and form, filter brick layer (09) bottom evenly laid many air branch pipes, seted up the air vent on each air branch pipe respectively, the one end of each air branch pipe and the air main one end intercommunication that corresponds, each air main evenly laid on the inner wall of filtering pond bottom, each air main's the other end stretches out to the filtering pond outside.
4. The novel denitrification filter tank device based on the organic polymer carrier as claimed in claim 1, wherein: the bearing layer (08) is a multi-level graded pebble layer, the particle size of pebbles of the pebble layer is 3-20 mm, and the layer height of the pebble layer is 0.35-0.45 m.
5. The novel denitrification filter tank device based on the organic polymer carrier as claimed in claim 1, wherein: the lower layer of the multi-layer filter material layer is a quartz sand filter layer (07), and the density of the quartz sand filter layer (07) is 2.5-2.7 g/cm3，d10＝0.9～1.2mm，K80Less than 1.4, and the thickness is 800-1000 mm; the upper layer of the multi-layer filter material layer is an organic polymer carrier filter material layer (06) and organic polymerThe particle size of the organic polymer carrier of the carrier filter material layer (06) is 3-5 mm, the layer height of the organic polymer carrier filter material layer (06) is 400-600 mm, the organic polymer carrier filter material layer (06) is subjected to biological affinity treatment, the surface of the organic polymer carrier filter material layer (06) forms a scaly and microporous structure, and the density of the organic polymer carrier filter material layer (06) is 1.05-1.1 g/cm3。
6. The novel denitrification filter tank device based on the organic polymer carrier as claimed in claim 1, wherein: and the device also comprises a PLC control system connected with the filtering system and the backwashing system.
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