CN210795920U - Municipal administration sewage advanced treatment's BAF system - Google Patents
Municipal administration sewage advanced treatment's BAF system Download PDFInfo
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Abstract
The utility model provides a municipal administration sewage advanced treatment's BAF system, include through water hole and/or water distributor intercommunication join in marriage ditch, denitrification filtering pond, nitration carbonization filtering pond, clean water basin, a serial communication port, denitrification filtering pond and nitration carbonization filtering pond separately set up, all are equipped with the three-layer light filler in denitrification filtering pond and the nitration carbonization filtering pond, follow supreme 70% less than or equal to the filling rate and less than or equal to 80% coarse hole filler, 95% less than or equal to the filling rate and less than 100% coarse hole filler, filling rate 100% micropore filler, the filling rate is the actual packing density of this material and the ratio of natural packing density. The utility model discloses can simplify the pond built-in, improve out water quality of water, reduce the operation energy consumption, reduce and maintain intensity.
Description
[ technical field ] A method for producing a semiconductor device
The utility model belongs to the sewage treatment field, concretely relates to BAF system of a municipal administration sewage advanced treatment.
[ background of the invention ]
With the continuous development of society, the discharge indexes of domestic town sewage plants in China are increasingly improved, for example, the pollutant discharge requirement of the town sewage plant meets the (GB 18918-2002) first-class A standard, and partial local governments have more strict discharge standards aiming at local conditions, for example, the clean discharge standard released by Zhejiang province requires that the total nitrogen discharge data of newly-built sewage plants is below 10mg/L, and partial newly-built sewage plants reach below 12 mg/L. This puts higher demands on the sewage treatment process. In all examination indexes of municipal sewage plants, the most difficult treatment is total nitrogen, so that in order to ensure that effluent is discharged after reaching the standard, a set of advanced treatment system is added behind a secondary sedimentation tank in most sewage plants, and the main purpose is to reduce the total nitrogen.
At present, advanced treatment systems of municipal sewage plants are basically denitrification Filter beds and Biological Aerated Filters (BAF), and treatment processes of the denitrification Filter beds and the BAF belong to the category of a biofilm method. Wherein, the denitrification filter can only reduce nitrate nitrogen and suspended solids, and the aeration biological filter (BAF) can achieve the integral removal of total nitrogen, COD and SS, so that the function of the aeration biological filter (BAF) is more complete and is a more optimized choice.
The Biological Aerated Filter (BAF) is characterized in that a bioreactor is filled with filler with high specific surface area to provide a carrier for microbial film growth, sewage flows downwards or upwards according to different sewage flow directions, the sewage flows through a filter material layer from top to bottom or from bottom to top, air is blown and aerated at the lower part of the filter material layer to enable air to be in contact with the sewage in the reverse direction or in the same direction, organic matters in the sewage and the biofilm on the surface of the filler are degraded through biochemical reaction, and the filler simultaneously plays a physical filtering role.
The filter materials adopted by the Biological Aerated Filter (BAF) in the market at present are two types, one is a ceramsite filter material with the density obviously higher than that of water, and the other is a spherical organic light filler with the density lower than that of water. The ceramsite and volcanic rock filter materials are easy to harden after being used for a long time, need to be turned over for cleaning, have huge workload, are complex to build in the BAF-like tank, have more materials, and need to be provided with a lining supporting plate, a single-hole membrane aerator and a backwashing filter head, wherein the filter head is easy to block and is very troublesome to replace; the spherical organic light filler has the defects of difficult control of back washing and poor film forming property. Therefore, further optimization design is required.
[ summary of the invention ]
The utility model provides a municipal administration sewage advanced treatment's BAF system can simplify the pond built-in, improve out water quality of water, reduce the operation energy consumption, reduce and maintain intensity.
The novel technical solution is as follows:
the utility model provides a BAF system of municipal administration sewage advanced treatment, includes through water hole and/or water distributor intercommunication join in marriage ditch, denitrification filtering pond, nitrify/carbonization filtering pond, clean water basin, its characterized in that, denitrification filtering pond and nitrify/carbonization filtering pond separately set up, all be equipped with three-layer light filler in denitrification filtering pond and the nitrification/carbonization filtering pond, from supreme 70% fill rate be less than or equal to 80% coarse pore filler, 95% fill rate be less than or equal to 100% coarse pore filler, fill rate be 100% micropore filler, the fill rate is the ratio of the actual packing density and the natural packing density of this material. The packing density, also called bulk density, is the mass per unit volume of a container filled with dust or powder freely and measured immediately after the completion of the filling, i.e., the mass per unit volume of the bulk material or the powdery material in a naturally packed state. The coarse-pore filler is a light filler with the internal pore diameter of 2-2.5 mm, and the microporous filler is a light filler with the internal pore diameter of less than or equal to 1 mm. Under the condition that the total height of the filler is basically determined, the lower layer is provided with a filling rate of 70-80% so that the layer can reach a better fluidization state on the basis of a larger filling rate, the filler of the layer can fully flow, water and gas distribution is facilitated, and backwashing of the whole device is facilitated; the 95-100% filling rate of the middle layer can enable the middle layer to be an immobilized filler layer, so that pollutants can be degraded sufficiently and effectively; the 100% loading of the uppermost layer is to ensure that the effluent SS reaches standards and that the remaining contaminants can be removed further. In addition, lower floor's filler is in the fluidization state, has avoided the hardening and the jam phenomenon of filler, and requirement when backwashing simultaneously reduces, only need the air purge can, the washing is no longer necessary, and backwash waste water still less, and the backwash effect is equal or even better, and can further practice thrift the production key element, need not at the base installation filter plate of filler.
Furthermore, the fillers adopted by the lower two layers are coarse-pore fillers which are filledThe material is provided with attached granular active carbon, and the specific surface area of the material is more than or equal to 10000m2/m3(ii) a The upper layer is microporous filler, no active carbon is attached to the surface, and the specific surface area is more than or equal to 35000m2/m3. The effect of removing SS by the coarse-pore filler is not good enough, the activated carbon is arranged for better removing pollutants, the microporous filler is easy to block, and backwashing is difficult to recover, so that the effect can be achieved by combined use.
Further, the light filler is modified polyurethane filler, and the wet density is 1g/cm3。
Furthermore, the three layers of light fillers are hydrophilic fillers, so that oil stains in water are prevented from being attached to the fillers, and the unit sludge concentration is reduced.
Furthermore, the three layers of light fillers are separately fixed through the blocking net and the supporting piece, the fixing mode is simple and effective, the cost is low, the three layers of fillers can be separated, the communication is avoided, and the situation that the original setting condition of the upper layer and the lower layer cannot be achieved is reduced.
Furthermore, a back washing system is arranged in the denitrification filter tank, and an aeration system and a back washing system are arranged in the nitrification/carbonization filter tank. Further, the back flushing system is a perforated pipeline for back flushing air or back flushing water. The water distribution mode in the pool only needs to be realized by water distribution through the perforated pipe, the aeration mode adopts tubular aeration, and the backwashing mode also adopts air outlet backwashing of the perforated pipe. In this system, the gas washing can reach the backwash effect, can significantly reduce the production of backwash waste water, uses a small amount of water to backwash immediately, also need not to stop into water during the backwash, the sparge water of backwash adopt former into water can, simplified the structure greatly, reduced the energy consumption.
Furthermore, the aeration system and the back flushing system in the nitrification/carbonization filter tank adopt the same fan to provide gas, so that aeration and back flushing gas cleaning can be completed, the structure is simplified, and the energy consumption is reduced.
Furthermore, a pipeline mixer used for fully mixing with an external carbon source is arranged on the water inlet pipeline communicated with the water distribution channel, so that the external carbon source and the inlet water can be fully and uniformly mixed, and the treatment effect is improved.
Further, an online nitrate nitrogen detector and an online ORP detector are arranged in the denitrification filter tank, an online ammonia nitrogen detector and an online DO detector are arranged in the nitrification/carbonization filter tank, and the online nitrate nitrogen detector, the online ORP detector, the online ammonia nitrogen detector and the online DO detector are in communication connection with an external control system.
Furthermore, a nitrifying liquid reflux pump is arranged in the clean water tank to prevent the total nitrogen of the final effluent from being higher due to overhigh ammonia nitrogen in the incoming water.
The utility model has the advantages as follows:
the filler adopted by the utility model is light filler with three-layer filling rate of 70-80%, 95% -100% and 100%, and the lower layer is in a semi-fluidized state and has aeration mixing effect, so that the water distribution requirement is not very high, only water supplement of a perforated pipe is needed, and the layout structure in the tank is greatly simplified; the lower layer of filler is in a semi-fluidized state, so that the hardening and blocking phenomena of the filler are avoided, the requirement during backwashing is reduced, only air washing is needed, water washing is not necessary, even if water washing is adopted, backwashing wastewater is less, and the backwashing effect is equivalent or even better; in addition, three layers of light fillers with different filling rates are arranged, so that production factors are saved, and a filter plate does not need to be arranged on a base of the filler; through real-time online monitoring and accurate dosing of water quality data, the data of the effluent can reach the standard stably. Therefore, the utility model discloses can bring simplify the pond built-in, improve a water quality of water, reduce the operation energy consumption, reduce the multiple beneficial effect of maintaining intensity, improve comprehensive economic benefits.
[ description of the drawings ]
FIG. 1 is a schematic structural view of a BAF system for advanced municipal sewage treatment of example 1;
FIG. 2 is a schematic view of the packing layer of the BAF system for advanced municipal sewage treatment of example 1;
description of the labeling: 1, a water inlet pipeline; 2, water through holes; 3, overflow holes; 4, a water tank; 5, water distribution pipes; 6, a water outlet; 7, a water outlet groove; 8, a water outlet pipeline; 9, backwashing the water outlet pipe; 11, emptying a pipe; 12, an aerator pipe; 14, a barrier net; 15, a light filler layer; 16, an empty valve; 17, backwashing a water outlet valve; 22, a water distribution area; 23, a diffusion fan; 25, a backwash valve; 29, a line mixer; 30, a perforated pipe; 32, an online ammonia nitrogen detection instrument; 35, a denitrification zone; 36, nitrification/carbonization zone; 37, a clear water area.
[ detailed description ] embodiments
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.
The following examples are not provided to limit the scope of the present invention, nor are the steps described to limit the order of execution, and the directions described are limited to the drawings. Modifications of the invention which are obvious to those skilled in the art in view of the prior art are also within the scope of the invention as claimed.
A BAF system for advanced treatment of municipal sewage is sequentially provided with a water distribution channel, a denitrification filter, a nitrification/carbonization filter and a clean water tank, wherein all structures are communicated with each other through water through holes and water distribution pipes. Three layers of light fillers are arranged in the denitrification filter tank and the nitrification and carbonization filter tank, and the filling rate of the fillers is 70-80%, more than 95% to less than 100% and 100% from bottom to top in sequence. More preferably, the filling rate of the filler at the lowermost layer is 70 to 75%. The packing density, also called bulk density, is the mass per unit volume of a container filled with dust or powder freely and measured immediately after the completion of the filling, i.e., the mass per unit volume of the bulk material or the powdery material in a naturally packed state. The packing ratio refers to the ratio of the current density to the packing density. The coarse-pore filler is a light filler with the internal pore diameter of 2-2.5 mm, and the microporous filler is a light filler with the internal pore diameter of less than or equal to 1 mm.
Preferably, the fillers adopted by the lower two layers are coarse-pore fillers, and the fillers are attached with granular activated carbon, and the specific surface area of the activated carbon is more than or equal to 10000m2/m3(ii) a The upper layer is microporous filler, no active carbon is attached to the surface, and the specific surface area is more than or equal to 35000m2/m3。
Preferably, the three layers of light fillers are hydrophilic fillers, so that oil stains in water are prevented from being attached to the fillers, and the unit sludge concentration is reduced.
Preferably, the three layers of light fillers are separately fixed through the blocking net and the supporting piece, the fixing mode is simple and effective, the cost is low, the three layers of fillers can be separated, the communication is avoided, and the situation that the original setting conditions of the upper layer and the lower layer cannot be achieved is reduced.
Preferably, the lightweight filler needs to be fixed by a barrier net and a support, and three layers of fillers need to be separated to avoid communication.
Preferably, the water distribution mode in the pool only needs to distribute water through the perforated pipe, the aeration mode adopts tubular aeration, and the backwashing mode also adopts perforated pipe air outlet backwashing. Because the adopted filler is light filler, a filter plate does not need to be arranged on a base of the filler, and only a wire mesh and a support frame are used for fixing. In addition, because the lower layer is in a semi-fluidized state, sewage is easy to be fully and uniformly mixed along with bottom aeration, a water distributor similar to a filter head is not needed to be arranged, and the aeration mixing effect is achieved, so that the water distribution requirement is not high, only the perforated pipe is needed for water supplement, and the layout structure in the pool is greatly simplified.
Preferably, the backwashing is performed without stopping the water supply, and the backwashing water may be supplied as it is.
Preferably, the water inlet pipeline is provided with a pipeline mixer, so that the sewage is fully mixed with an external carbon source before entering the water distribution channel, and the later denitrification reaction is uniform.
Preferably, an online ORP detector and an online nitrate nitrogen detector are arranged in the denitrification tank; an online ammonia nitrogen detector and an online DO detector are arranged in the nitrification/carbonization tank; an on-line nitrate nitrogen detector is arranged in the clean water tank.
Preferably, the aeration fan and the backwashing fan are the same fan.
Description of the working principle of the invention: the biological aerated filter reactor runs periodically, and a complete period is formed from the beginning of filtration to the end of back flushing. The specific process is as follows:
the sewage is fully mixed with an external carbon source before entering a water distribution channel, the sewage enters a denitrification region from the bottom of the water distribution channel through a perforated pipe after entering the water distribution channel, water flows from bottom to top, nitrate nitrogen in the water is converted into nitrogen under the action of denitrifying bacteria and is discharged out of a water body when passing through a filter material region, and SS in the water is also intercepted; the effluent of the denitrification tank overflows into a water inlet channel of the nitrification/carbonization tank, is introduced into the bottom of the tank through a water distribution pipe, passes through a filter material area from bottom to top, effectively degrades ammonia nitrogen and organic matters by utilizing autotrophic bacteria through full aeration in the filter material area, and finally overflows into a clear water tank. When the nitrate nitrogen value is detected to be higher in the clear water tank, the nitrification liquid needs to be refluxed to achieve the purpose of degrading the total nitrogen.
The system for adding the carbon source intelligently runs without human participation, wherein a related calculation formula needs to be input in a program, and the specific calculation formula is as follows:
wherein the content of the first and second substances,
Qmamount of sodium acetate solution added, m3/h；
Cm-external sodium acetate, mg/L, which must be added;
5-1 kg of nitrate nitrogen needs additional carbon source amount (calculated by COD), kgCOD/kgNO3；
0.68-unit sodium acetate corresponds to COD value, g/g;
30 percent-the proportioning concentration of the sodium acetate solution;
Q1water inflow, m3/h；
C1-nitrate nitrogen concentration in the influent water, mg/L;
Q2amount of reflux, m3/h；
C2Concentration of nitrate and nitrogen in clear water tank, mg/L；
C0And (4) the nitrate nitrogen value of the target effluent of the nitrification region is mg/L.
With the filtering, because the biomass newly generated on the surface of the filter material is more and more, the intercepted SS is continuously increased, the head loss of the filter tank is slowly increased in the initial stage, when the solid matter is accumulated to a certain degree, the head loss reaches the limit head loss or the SS is penetrated, the filter tank is backwashed to remove the excessive microbial membrane and the SS in the filter bed, and the processing capacity of the filter tank is recovered. And entering the next operation cycle after the back washing is finished.
Example one
A BAF system for advanced treatment of municipal sewage is shown in figure 1, and is provided with 4 zones, two of which are reaction zones, and the reaction zones sequentially comprise: the device comprises a water distribution area 22, a denitrification area 35, a nitrification/carbonization area 36 and a clear water area 37, wherein a light packing layer 15 is arranged in the denitrification area 35 and the nitrification/carbonization area 36, and the light packing layer 15 is divided into three layers from bottom to top.
Sewage is mixed with a carbon source in an inlet pipeline 1 through a pipeline mixer 29 and then enters a water distribution area together, the bottom of a water distribution area 22 is provided with a water through hole 2 and a perforated pipe 30 which are connected with the bottom of a denitrification area 35, the sewage passes through a light packing layer 15 from bottom to top, the light packing layer 15 has 3 layers in total, the heavy hole packing layer 38 with the filling rate of 70 percent, the heavy hole packing layer 39 with the filling rate of 95 percent and a micropore packing layer 40 with the filling rate of 100 percent respectively from bottom to top, and the specific surface area of the heavy hole packing layer 38, the heavy hole packing layer 39 and the micropore packing layer 40 are2/m3The surface of which is attached with granular active carbon with the internal average pore diameter of 2.5mm is provided with modified polyurethane filler, and the modified polyurethane filler adopts the modified polyurethane filler with the specific surface area of more than or equal to 35000m2/m3And the surface of which the internal average pore diameter is 1mm is not attached with the modified polyurethane filler of the granular activated carbon.
The filler needs to be fixed by a barrier net 14, an aeration pipe 12 is arranged at the bottom of the tank and is used for diffusing wind provided by a fan 23, microorganisms degrade pollutants under the aerobic condition, an overflow hole 3 is arranged at the upper end of a denitrification area 35, sewage enters a nitrification/carbonization area 36 through the overflow hole, a water tank 4 is arranged at the upper end of the nitrification/carbonization area 36 and is used for receiving the outlet water of the denitrification area 35, a water distribution pipe 5 is arranged at the lower end of the water tank 4, the sewage is introduced into the bottom of the nitrification/carbonization area 36 through the water distribution pipe 5 and is uniformly distributed through a perforated pipe 30, the outlet water of the nitrification/carbonization area 36 flows into a clear water area through the overflow hole 3, the water of the clear water area enters an outlet water tank 7 through a water outlet 6 and finally enters the next treatment unit through an outlet pipe 8, wherein a reflux pump 20 is arranged in the clear water area and is mainly opened under the condition of.
According to different working conditions, the system automatically adds the required carbon source, and the obtained technical effects are as follows:
1) when the ammonia nitrogen in the inlet water is less than 5mg/L, the target removal value of the nitrate nitrogen is the difference value between the inlet water value and the target control value, and the adding amount of the carbon source is specifically calculated as follows:
wherein Q ismAmount of sodium acetate solution added, m3/h；Cm-external sodium acetate, mg/L, which must be added; 5-1 kg of nitrate nitrogen needs additional carbon source amount (calculated by COD), kgCOD/kgNO3(ii) a 0.68-unit sodium acetate corresponds to COD value, g/g; 30 percent-the proportioning concentration of the sodium acetate solution; q1Water inflow, m3/h；C1-nitrate nitrogen concentration in the influent water, mg/L; q2Amount of reflux, m3/h；C2Concentration of nitrate and nitrogen in the clean water tank is mg/L; c0And taking the nitrate nitrogen value of the target effluent of the nitrification region as 5 mg/L.
From the above calculation, it can be seen that the water inlet is 2000m3In the case of the reaction times/h, the external dosage of sodium acetate solution is 490m3/h。
In addition, the ammonia nitrogen value of the effluent in the nitrification/carbonization tank is controlled below 1mg/L, and the aeration air volume is adjusted according to the detection data of the online ammonia nitrogen detection instrument 32. The water quality of inlet water and outlet water under the working condition 1) is shown in the following table 1:
table 1 working condition 1) water inlet and outlet data table
2) When the ammonia nitrogen of the inlet water is more than 5mg/L, the target removal value of the nitrate nitrogen is the difference value between the inlet water value and the target control value, and the adding amount of the carbon source is specifically calculated as follows:
from the above calculation, the amount of sodium acetate solution added to the outside at this time was 588m3H is used as the reference value. The water quality of inlet water and outlet water under the working condition 2) is shown in the following table 2:
TABLE 2 working conditions 2) water inlet and outlet data table
| COD | Ammonia nitrogen | Nitro nitrogen | Total nitrogen | SS | |
| Unit of | mg/L | mg/L | mg/L | mg/L | mg/L |
| Inflow water | 36 | 6.3 | 12 | 19.4 | 22 |
| Discharging |
15 | 0.7 | 6.8 | 8.4 | 7 |
| Removal rate | 58％ | 89％ | 43％ | 57％ | 69％ |
Along with the increase of the running time of the system, suspended matters in the filter materials are continuously increased and the aging of microorganisms causes the blockage of the filter materials, the denitrification area 35 is backwashed once every 4 days, and the nitrification/carbonization area 36 is backwashed once every 3 days. The back washing sequence is as follows: at first, open atmospheric valve 16, reduce pond water level to the filter material surface of water that exposes through blow-down pipe 11, then open backwash valve 25 and carry out the backwash aeration, the backwash air volume is given vent to anger through backwash perforated pipe 13, it still keeps intaking this moment, liquid level slowly rises in the pond, open the backwash outlet valve 17 of establishhing in the upper end at this in-process, can overflow to the backwash wastewater disposal basin from backwash outlet pipe 9 when treating pond liquid level to rise to a take the altitude, this process keeps 5 ~ 10min can, close backwash valve 25 afterwards and still keep intaking, this process also keeps 5 ~ 10min, can close backwash outlet valve 17 after this pond goes out the water totally, whole backwash cycle duration is about 15 ~ 30 min.
After 6 months of operation, the device system of the invention operates stably without the phenomena of filler blockage and hardening; the backwashing effect is good, and the original working condition can be recovered after backwashing is finished; meanwhile, the quantity of backwashing water is small and only accounts for about 2 percent of the treated water quantity. The water quality of inlet water and outlet water is shown in the following table 3:
TABLE 3 statistics table for water quality of inlet and outlet water after 6 months of continuous operation
Example two
Different from the first embodiment, the lightweight packing layer of the present embodiment has 3 layers, from bottom to top, respectively, a coarse-pore packing layer with a filling rate of 80%, a coarse-pore packing layer with a filling rate of 99%, and a microporous packing layer with a filling rate of 100%, wherein the first two adopt a specific surface area of not less than 10000m2/m3The surface of which is attached with granular active carbon with the internal average pore diameter of 2.0mm is provided with modified polyurethane filler, and the modified polyurethane filler adopts modified polyurethane filler with the specific surface area of more than or equal to 35000m2/m3And the surface of which the average pore diameter inside is 0.8mm is not attached with the modified polyurethane filler of granular activated carbon.
Along with the increase of the running time of the system, suspended matters in the filter materials are continuously increased, the filter materials are blocked due to the aging of microorganisms, the denitrification area is backwashed once every 3 days, and the nitrification/carbonization area is backwashed once every 3 days. The back washing sequence is as follows: at first open the atmospheric valve, reduce pond water level to the filter material surface of water that exposes through the atmospheric pipe, then open the backwash valve and carry out the backwash aeration, the backwash amount of wind is given vent to anger through the backwash perforated pipe, still keep intaking this moment, the liquid level slowly rises in the pond, open at this in-process and establish the backwash outlet valve in the upper end, can overflow to the backwash wastewater disposal basin from the backwash outlet pipe when treating that pond liquid level rises to a take the altitude, this process keeps 5 ~ 10min can, it still keeps intaking to close the backwash valve afterwards, this process also keeps 5 ~ 10min, can close the backwash outlet valve after treating that pond is gone out the water totally, whole backwash cycle duration is about 15 ~ 30 min.
After 4 months of operation, the device system of the invention operates stably without the phenomena of filler blockage and hardening; the backwashing effect is good, and the original working condition can be recovered after backwashing is finished; meanwhile, the quantity of backwashing water is small and only accounts for about 2 percent of the treated water quantity. The water quality of inlet water and outlet water is shown in the following table 4:
TABLE 4 statistics table for water quality of inlet and outlet water after 6 months of continuous operation
EXAMPLE III
Different from the first embodiment, the lightweight packing layer of the present embodiment has 3 layers, from bottom to top, respectively, a coarse-pore packing layer with a filling rate of 75%, a coarse-pore packing layer with a filling rate of 96%, and a microporous packing layer with a filling rate of 100%, wherein the first two adopt a specific surface area of not less than 10000m2/m3The surface of which is attached with granular active carbon with the internal average pore diameter of 2.3mm is modified polyurethane filler, and the modified polyurethane filler adopts the modified polyurethane filler with the specific surface area of more than or equal to 35000m2/m3And the surface of which has an average pore diameter of 0.5mm is not attached with the modified polyurethane filler of granular activated carbon.
Along with the increase of the running time of the system, suspended matters in the filter materials are continuously increased, the filter materials are blocked due to the aging of microorganisms, the denitrification area is backwashed once every 4 days, and the nitrification/carbonization area is backwashed once every 3 days. The back washing sequence is as follows: at first open the atmospheric valve, reduce pond water level to the filter material surface of water that exposes through the atmospheric pipe, then open the backwash valve and carry out the backwash aeration, the backwash amount of wind is given vent to anger through the backwash perforated pipe, still keep intaking this moment, the liquid level slowly rises in the pond, open at this in-process and establish the backwash outlet valve in the upper end, can overflow to the backwash wastewater disposal basin from the backwash outlet pipe when treating that pond liquid level rises to a take the altitude, this process keeps 5 ~ 10min can, it still keeps intaking to close the backwash valve afterwards, this process also keeps 5 ~ 10min, can close the backwash outlet valve after treating that pond is gone out the water totally, whole backwash cycle duration is about 15 ~ 30 min.
After 3 months of operation, the device system of the invention operates stably without the phenomena of filler blockage and hardening; the backwashing effect is good, and the original working condition can be recovered after backwashing is finished; meanwhile, the quantity of backwashing water is small and only accounts for about 2 percent of the treated water quantity. The water quality of inlet water and outlet water is shown in the following table 5:
TABLE 5 statistics table for water quality of inlet and outlet water after 6 months of continuous operation
Claims (10)
1. The utility model provides a BAF system of municipal administration sewage advanced treatment, includes through water hole and/or water distributor intercommunication join in marriage ditch, denitrification filtering pond, nitrify/carbonization filtering pond, clean water basin, its characterized in that, denitrification filtering pond and nitrify/carbonization filtering pond separately set up, all be equipped with three-layer light filler in denitrification filtering pond and the nitrification/carbonization filtering pond, from supreme 70% fill rate be less than or equal to 80% coarse pore filler, 95% fill rate be less than 100% coarse pore filler, fill rate be 100% micropore filler, the fill rate is the ratio of the actual packing density and the natural packing density of this material.
2. The BAF system for advanced municipal sewage treatment according to claim 1, wherein the coarse-pore filler has a specific surface area of 10000m or more2/m3The surface of the microporous filler is adhered with granular activated carbon, and the specific surface area of the microporous filler is more than or equal to 35000m2/m3The surface of (2) does not adhere to the light filler of the activated carbon.
3. The BAF system for advanced municipal sewage treatment according to claim 1 or 2, wherein the light weight filler is a modified polyurethane filler.
4. The advanced municipal sewage treatment BAF system according to claim 1 or 2, wherein all three layers of the lightweight filler are hydrophilic fillers.
5. The BAF system for advanced municipal sewage treatment according to claim 1, wherein the three layers of lightweight packing are held apart by a barrier and support.
6. The BAF system for advanced municipal sewage treatment according to claim 1, wherein a back-flushing system is arranged in the denitrification filter tank, and an aeration system and a back-flushing system are arranged in the nitrification/carbonization filter tank.
7. The municipal sewage advanced treatment BAF system of claim 6, wherein the backwash system is a perforated pipe for backwash air or backwash water.
8. The BAF system for advanced municipal sewage treatment according to claim 5, wherein the aeration system and the backwashing system in the nitrification/carbonization filter tank use the same fan to supply gas.
9. The BAF system for advanced municipal sewage treatment according to claim 1, wherein the water inlet pipe communicating with the distribution canal is provided with a pipe mixer for intensive mixing with an external carbon source.
10. The BAF system for advanced municipal sewage treatment according to claim 1, wherein an online nitrate nitrogen detector and an online ORP detector are arranged in the denitrification filter, an online ammonia nitrogen detector and an online DO detector are arranged in the nitrification/carbonization filter, and the online nitrate nitrogen detector, the online ORP detector, the online ammonia nitrogen detector and the online DO detector are in communication connection with an external control system.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112079438A (en) * | 2020-07-28 | 2020-12-15 | 杭州余杭城西净水有限公司 | Combined filter material biological aerated filter system |
| CN116444045A (en) * | 2023-05-19 | 2023-07-18 | 重庆三峰科技有限公司 | Combined denitrification aeration biological filter and sewage treatment system |
-
2019
- 2019-08-20 CN CN201921350154.8U patent/CN210795920U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112079438A (en) * | 2020-07-28 | 2020-12-15 | 杭州余杭城西净水有限公司 | Combined filter material biological aerated filter system |
| CN116444045A (en) * | 2023-05-19 | 2023-07-18 | 重庆三峰科技有限公司 | Combined denitrification aeration biological filter and sewage treatment system |
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