CN218202422U - Sewage advanced treatment system - Google Patents
Sewage advanced treatment system Download PDFInfo
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- CN218202422U CN218202422U CN202221944501.1U CN202221944501U CN218202422U CN 218202422 U CN218202422 U CN 218202422U CN 202221944501 U CN202221944501 U CN 202221944501U CN 218202422 U CN218202422 U CN 218202422U
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Abstract
The embodiment of the utility model provides a sewage advanced treatment system, which comprises a regulating reservoir, a first functional pool, a first filter pool and a backwashing pool, wherein the regulating reservoir, the first functional pool and the first filter pool are connected in sequence and are used for treating sewage in sequence; the first filter tank is connected with the backwashing tank and is used for realizing backwashing of the first filter tank; the backwashing pool is connected with the regulating pool and is used for enabling the wastewater produced by the backwashing pool to flow into the regulating pool as sewage. The embodiment of the utility model provides a can improve the sewage reuse rate.
Description
Technical Field
The embodiment of the utility model relates to a sewage treatment technical field, concretely relates to advanced wastewater treatment system.
Background
The advanced sewage treatment technology is one of the most common sewage treatment modes in the field of sewage treatment, and after the sewage is subjected to advanced treatment, impurities in the sewage can be removed, so that the aim of recycling is fulfilled.
At present, the advanced wastewater treatment technology mainly adopts a physical and chemical method, and is generally formed by optimally combining unit technologies such as coagulation, precipitation, filtration, activated carbon adsorption, membrane technology, ozone oxidation and disinfection and the like to form a multi-stage barrier system, such as an ultrafiltration and reverse osmosis process, but after the advanced wastewater treatment is carried out by the ultrafiltration and reverse osmosis process, wastewater with a certain concentration is still generated and needs to be treated again.
Therefore, in the advanced wastewater treatment technology, how to increase the reuse rate of wastewater becomes a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the embodiment of the utility model provides a sewage advanced treatment system to improve sewage reuse rate.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions.
The embodiment of the utility model provides a sewage advanced treatment system, which comprises an adjusting tank, a first function, a first filter tank and a back washing tank; wherein,
the regulating tank, the first functional tank and the first filter tank are sequentially connected and used for sequentially treating sewage;
the first filter tank is connected with the back washing tank and is used for realizing back washing of the first filter tank;
the backwashing pool is connected with the regulating pool and is used for enabling the wastewater produced by the backwashing pool to flow into the regulating pool as sewage.
Optionally, the backwashing pool at least comprises a backwashing clean water pool and a backwashing wastewater pool, the backwashing clean water pool is used for storing backwashing water, and the backwashing wastewater pool is used for storing wastewater generated by backwashing.
Optionally, the first filter tank is connected to the backwash tank, and includes: the backwashing clean water tank is connected into the water outlet of the first filter tank;
and the backwashing wastewater tank is connected into the backwashing effluent of the first filter tank.
Optionally, the first filter tank is connected to the backwash tank, and includes: and the first filter tank is connected with the outlet water of the backwashing clean water tank.
Optionally, the backwash tank is connected to the regulating tank, and includes: and the regulating tank is connected to the effluent of the backwashing wastewater tank.
Optionally, the first functional tank is a high-efficiency sedimentation tank, and the first filter tank is a denitrification biological filter tank.
Optionally, the method further includes: a second functional tank and a second filter tank; wherein,
the first filter tank is connected with the second functional tank, and the second functional tank is connected with the second filter tank and is used for sequentially treating sewage;
the second filter tank is connected with the backwashing tank and is used for realizing backwashing of the second filter tank.
Optionally, the second filter tank is connected to the backwash tank, and includes: the second filter tank is connected with the outlet water of the back flushing clean water tank;
and the back-flushing outlet water of the second filter tank flows into a back-flushing wastewater tank.
Optionally, the second functional tank is an ozone oxidation contact tank, and the second filter tank is an aerobic biofilter.
Optionally, the method further includes: and the sludge treatment system is connected with the first functional tank.
The embodiment of the utility model provides a sewage advanced treatment system, through connecting equalizing basin, first function pond, and first filtering pond in proper order, be used for handling sewage in proper order to can combine a plurality of sewage treatment process, realize the advanced treatment of sewage; moreover, the first filter tank is connected with the back washing tank and is used for realizing back washing of the first filter tank, so that the back washing tank can be utilized to perform back washing operation in the advanced sewage treatment process of the first filter tank; the backwashing pool is connected with the regulating pool and used for enabling the wastewater produced by the backwashing pool to flow into the regulating pool as sewage, so that the produced wastewater can flow back into the advanced wastewater treatment system for advanced treatment again, recycled water is obtained, the sewage reuse rate is effectively improved, the produced wastewater flows back into the advanced wastewater treatment system as sewage, the wastewater is not required to be discharged, and the requirement of zero discharge of the sewage is further met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of an alternative configuration of an advanced wastewater treatment system;
FIG. 2 is a schematic view of an alternative structure of the advanced wastewater treatment system provided by the embodiment of the present invention;
FIG. 3 is a schematic view of another alternative structure of the advanced wastewater treatment system provided by the embodiment of the present invention;
FIG. 4 is a schematic diagram of an alternative structure of the high-efficiency sedimentation tank;
FIG. 5 is a schematic view of another alternative structure of the advanced wastewater treatment system provided by the embodiment of the present invention;
FIG. 6 is a schematic view of another alternative structure of the advanced wastewater treatment system provided by the embodiment of the present invention;
FIG. 7 is a schematic diagram of an alternative configuration of an ozone system;
fig. 8 is a schematic structural diagram of an alternative example of the advanced wastewater treatment system provided by the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
After the urban sewage is subjected to traditional secondary treatment, the urban sewage still contains trace amounts of refractory harmful organic matters, total Nitrogen, total Phosphorus and the like, has high chromaticity, outstanding smell and poor biodegradability and has biotoxicity, and pollutants such as COD (Chemical Oxygen Demand), SS (Suspended Solids), TN (Total Nitrogen), TP (Total Phosphorus) and the like need to be further subjected to advanced treatment in order to meet stricter discharge and reuse standards. As described in the background, advanced treatment of wastewater can be achieved by using the process of ultrafiltration and reverse osmosis, and FIG. 1 schematically shows an alternative structure of a wastewater advanced treatment system, which comprises a self-cleaning filter 10, an ultrafiltration system 11, a security filter 12 and a reverse osmosis system 13. Wherein, the self-cleaning filter 10, the ultrafiltration system 11, the cartridge filter 12 and the reverse osmosis system 13 are connected in sequence.
The self-cleaning filter 10 is used for mechanically filtering particles such as micro suspended particles and colloid in sewage, and is mainly realized by filtering laminations in the self-cleaning filter.
The ultrafiltration system 11 is mainly used for filtering sewage by an ultrafiltration device, is a low-pressure membrane filtration process, can separate macromolecular compounds from raw water, reduces the turbidity and pollution index of outlet water, and improves the inlet water quality of the reverse osmosis system.
The cartridge filter 12 is used to mechanically filter again particles such as minute suspended particles, colloids, and microorganisms remaining in the water.
The reverse osmosis system 13 is used for removing anions/cations, soluble colloids, micromolecular organic matters and the like in water, and is mainly used for filtering through a reverse osmosis membrane.
As shown in fig. 1, the raw sewage first passes through a self-cleaning filter 10 to trap particles and suspended matters possibly remaining in the sewage, thereby providing a security function. The wastewater enters an ultrafiltration system 11 after passing through a self-cleaning filter, and an ultrafiltration device in the ultrafiltration system realizes removal of biological pollutants, particles, colloid, turbidity, bacteria and the like in the wastewater, thereby meeting the water quality requirement of the inlet water of the reverse osmosis system. The produced water of the ultrafiltration device enters the security filter 12 for secondary filtration, so that the damage to the reverse osmosis membrane is avoided. Filtered by the cartridge filter and then enters the reverse osmosis membrane stack of the reverse osmosis system 13, the recyclable water (i.e., the reuse water) passing through the reverse osmosis membrane stack enters the product water tank, and the filtered concentrated water containing higher pollutants enters the concentrated water tank.
However, in the advanced wastewater treatment system shown in fig. 1, the reuse rate of the advanced wastewater treatment is about 70%, and correspondingly, the output proportion of the concentrated water which is not reused is about 30%. Moreover, the produced concentrated water has higher pollutant content, so that the treatment requirement on the concentrated water is higher, and the treatment difficulty is increased, therefore, the produced concentrated water is often required to be additionally discharged into a large sewage treatment plant with stronger sewage deep treatment capability for treatment. It can be seen that the sewage reuse rate in the sewage advanced treatment system shown in fig. 1 needs to be improved, and the discharge of concentrated water also makes the sewage zero discharge requirement in the sewage advanced treatment technology not be satisfied.
Based on this, the embodiment of the utility model provides a new sewage advanced treatment scheme, combine multiple sewage treatment technology, the sewage treatment function of the different technologies of comprehensive utilization, realize the advanced treatment to sewage, and, consider the waste water scheduling problem that produces in sewage advanced treatment, realize advanced treatment as sewage in the sewage advanced treatment system with the waste water that produces among the sewage advanced treatment process, obtain the reuse water, effectively improve the sewage rate of reuse, and, the waste water that produces among the sewage advanced treatment process can realize retreatment in the sewage advanced treatment system, need not to carry out waste water and arrange outward, the requirement of sewage zero release has been satisfied.
Fig. 2 exemplarily shows an optional structural schematic diagram of the advanced wastewater treatment system provided by the embodiment of the present invention, and as shown in fig. 2, the advanced wastewater treatment system includes: a regulating tank 20, a first functional tank 21, a first filter tank 22 and a backwashing tank 23.
The adjusting tank 20, the first functional tank 21, and the first filter 22 are connected in sequence, and the effluent of the adjusting tank 20 can flow into the first functional tank 21, and the effluent of the first functional tank 21 flows into the first filter 22, so as to be used for sequentially treating sewage. As an optional realization, equalizing basin 20 can be the part of adjusting the processing to the quality of water of sewage, when pollutants such as COD, SS, TN, TP in aquatic surpass the control index upper limit of sewage advanced treatment system, can have the not thorough problem of sewage advanced treatment, the embodiment of the utility model provides an in through flowing into the equalizing basin with sewage, can control the quality of water of handling for treat that the quality of water of advanced treatment sewage accords with the treatment standard, and then realize the deep treatment to sewage, thereby the clear water after deep treatment satisfies urban sewage's retrieval and utilization requirement. The first functional tank 21 may be a part having an advanced treatment function for wastewater, which may be treated on the basis of the water produced from the conditioning tank for removing contaminants from the water. The first filter 22 may be a part for filtering contaminated water, and filters contaminants in the water based on the water produced by the first functional tank. Through the sequential connection of the adjusting tank 20, the first functional tank 21 and the first filter 22, the advanced treatment of sewage can be realized by combining a plurality of sewage treatment processes.
The first filter 22 is connected with a backwashing pool 23, and the effluent of the first filter 22 can flow into the backwashing pool 23, and/or the effluent of the backwashing pool 23 flows into the first filter 22, so as to realize backwashing of the first filter. As an optional implementation, in the process of filtering the sewage by the first filter 22, in order to ensure the filtering performance of the first filter, the first filter needs to perform a backwashing operation, and based on the connection between the first filter and the backwashing tank, the first filter realizes backwashing by using the backwashing tank.
The backwash tank 23 is connected with the regulating tank 20, and the effluent of the backwash tank 23 can flow into the regulating tank 20 so as to enable the wastewater produced by the backwash tank to flow into the regulating tank as sewage. As an optional realization, be connected with the equalizing basin based on the backwash tank, and then the waste water of backwash tank output can flow into the equalizing basin, then the waste water of backwash tank output can be as sewage, by equalizing basin 20, first function pond 21, and first filtering pond 22 carry out advanced treatment in proper order, obtain the reuse water, moreover, can flow back to sewage advanced treatment system and carry out advanced treatment once more based on the waste water of output among the sewage advanced treatment system to need not to arrange waste water outward.
It can be seen that in the embodiment of the utility model, the adjusting tank, the first functional tank and the first filter tank are connected in sequence and used for treating sewage in sequence, so that a plurality of sewage treatment processes can be combined to realize deep treatment of sewage; in addition, the first filter tank is connected with the backwashing tank and is used for realizing the backwashing of the first filter tank, so that the first filter tank realizes the backwashing operation by utilizing the backwashing tank in the sewage advanced treatment process; the backwashing pool is connected with the regulating pool and is used for enabling the wastewater produced by the backwashing pool to flow into the regulating pool as sewage, so that the wastewater produced by the backwashing pool is subjected to advanced treatment to obtain reuse water, the sewage reuse rate is effectively improved, the produced wastewater can flow back into the sewage advanced treatment system to be subjected to advanced treatment again, the wastewater does not need to be discharged outside, and the requirement of zero discharge of the sewage is further met.
In some embodiments, the backwashing pool may include at least a backwashing clean water pool and a backwashing wastewater pool, wherein the backwashing clean water pool is used for storing backwashing water, and the backwashing wastewater pool is used for storing wastewater generated by backwashing, and fig. 3 schematically illustrates another optional structural diagram of the sewage advanced treatment system provided by the embodiment of the present invention.
As shown in fig. 3, sewage flows into the regulating tank 20, the effluent of the regulating tank 20 flows into the first functional tank 21, the effluent of the first functional tank 21 flows into the first filter 22, and then the effluent of the first filter is obtained, wherein based on different functions of the backwash clear water tank 23a and the backwash waste water tank 23b, optionally, the backwash clear water tank 23a can be connected to the effluent of the first filter 22, so as to store the effluent of the first filter 22, and can be used as backwash clear water when the first filter 22 has backwash demand; the backwash wastewater tank 23b can be connected to the backwash wastewater of the first filter 22 to store the backwash wastewater produced by the first filter 22 for further treatment.
It should be noted that the amount of the effluent of the backwash clear water tank 23a connected to the first filter 22 is determined by the backwash requirement of the first filter 22, and may be a small amount of water in the effluent of the first filter, and the specific amount of water is not limited in the embodiment of the present invention.
Optionally, the first filter 22 may be connected to the effluent of the backwash clear water tank 23a, and in a case that the first filter 22 has a backwash requirement, the effluent of the first filter 22 stored in the backwash clear water tank 23a is used as backwash clear water, and is output through the backwash clear water tank 23a to flow into the first filter 22, so as to implement backwash of the first filter 22, and the treated effluent of the first filter 22 flows into the first filter 22 as backwash clear water, so that it is not necessary to additionally use city water to flow into the first filter for backwash, and water resources are saved.
In some embodiments, the conditioning tank 20 can be connected to the outlet of the backwash wastewater tank 23b, so that wastewater produced in the backwash wastewater tank 23b can flow into the conditioning tank 20 as sewage. The wastewater produced in the backwashing wastewater tank 23b is the backwashing wastewater produced by backwashing the first filter 22 stored in the backwashing wastewater tank, so that the effluent of the backwashing wastewater tank 23b flows into the regulating tank 20, the wastewater produced in the advanced wastewater treatment system flows back to the advanced wastewater treatment system for treatment again, the reuse water is obtained, the sewage reuse rate is effectively improved, the produced wastewater flows back to the advanced wastewater treatment system as sewage, the wastewater is not required to be discharged outside, and the requirement of zero discharge of the sewage is further met.
As an alternative implementation, the first functional tank can be a high-efficiency sedimentation tank, and the first filter tank can be a denitrification biological filter tank.
Wherein, can effectively remove SS and TP in the sewage through high-efficient sedimentation tank. Fig. 4 is a schematic diagram illustrating an alternative structure of the high-efficiency sedimentation tank, and as shown in fig. 4, the high-efficiency sedimentation tank may include:
a coagulation zone (41 in the figure), a flocculation zone (42 in the figure), a reaction zone (43 in the figure), a sludge settling zone (44 in the figure), an inclined tube clarification zone (45 in the figure), a sludge concentration zone (46 in the figure), sludge backflow (47 in the figure) and sludge discharge (48 in the figure).
Referring to fig. 4, sewage flows into the high-efficiency sedimentation tank, coagulant is added into a coagulation area of the high-efficiency sedimentation tank, and flocculant is added into the flocculation area (a feeding point is arranged at a dotted line circled part in the figure), wherein the added coagulant and flocculant can react with pollutants in the sewage or have the effects of adsorption and the like on the pollutants, and then the pollutants are removed through a sludge sedimentation area, an inclined tube clarification area, a sludge concentration area, sludge backflow and sludge discharge. Wherein, the sludge in the high-efficiency sedimentation tank can be returned to a flocculation zone and a reaction zone by using a sludge pump, and the sludge can be discharged by using the sludge pump. Moreover, in order to further ensure the effect of advanced sewage treatment, the efficient sedimentation tank can further comprise a control system with sludge level detection and a sludge storage tank (not shown in the figure) for storing sludge discharged from the bottom, wherein the sludge level detection of the control system can be realized by a sludge level meter.
Further, in a specific example, the coagulant added in the coagulation zone of the high-efficiency sedimentation tank may be PAC (Poly aluminum Chloride), the adding concentration of PAC may be 20-50mg/L, the flocculant added in the flocculation zone may be PAM (Poly (acrylamide), polyacrylamide), and the adding concentration of PAM may be 0.2-1mg/L.
It should be noted that the above example is only an alternative implementation, and should not limit the scope of the present invention. The utility model discloses the parameter in first function pond and first function pond also can correspond the setting to the concrete processing demand of sewage according to sewage advanced treatment system.
Wherein SS and TN in water can be effectively removed through the denitrification biological filter. The denitrification biological filter can comprise a water distribution system, a filter head, a biological filter material, an integral filter plate, a pneumatic valve group, a back washing system and the like.
Optionally, in a preferred example, the denitrification biofilter may comprise: a water inlet distribution channel; a V-shaped water inlet groove; a biological filter bed; a filter plate with a filter head; the filtered water outlet channel and the backwashing water and gas distribution gallery; a backwash water outlet gate; backwashing and feeding water; back flushing air inlet; discharging water; air cushion layer in the air washing process. The water flowing into the denitrification biological filter is firstly distributed by a water inlet and distribution channel of the denitrification biological filter, and then is uniformly distributed into each water tank in the denitrification biological filter through a V-shaped water inlet groove, and is filtered by a biological filter material bed with a certain height and a filter plate with a filter head, so that the filtered water flows out through a filtered water outlet channel to obtain outlet water. The denitrification biofilter has a back washing requirement, back washing inlet water enters the denitrification biofilter through a back washing water and gas distribution gallery, back washing gas enters the denitrification biofilter through the back washing water and the gas distribution gallery, and the back washing gas is subjected to gas washing through an air cushion layer.
Further, in a specific example, the filtering speed of the denitrification biological filter can be 5-8m/h, the removal load per cubic meter of filter material per day can be 0.3-3.0kg/d, and the average backwashing water consumption of a backwashing systemCan be 4.5-5m 3 /m 2 。
It should be noted that the above example is only an optional implementation, and should not limit the scope of the present invention. The utility model discloses the parameter in first filtering pond and first filtering pond also can correspond the setting to the concrete processing demand of sewage according to the advanced wastewater treatment system.
In some embodiments, as shown in fig. 5, fig. 5 is a schematic diagram of another optional structure of the advanced wastewater treatment system provided by the embodiment of the present invention, and the advanced wastewater treatment system may further include a second functional tank 24 and a second filter tank 25.
Wherein, the first filter tank 22 is connected with a second functional tank 24, and the second functional tank 24 is connected with a second filter tank 25 for sequentially treating sewage; the second filter 25 is connected with the backwashing tank 23 and is used for backwashing the filter. As an alternative implementation, the second functional tank 24 may be a part having an advanced treatment function for wastewater, which may be further treated on the basis of the water produced by the first filter tank for further removal of contaminants from the water. The second filter 25 may be a part for filtering the sewage, and further filters the sewage based on the water produced by the second functional tank, thereby effectively realizing advanced treatment of the sewage based on a combination of a plurality of sewage treatment processes.
In some embodiments, based on the backwash clear water tank 23a and the backwash wastewater tank 23b shown in fig. 3, fig. 6 exemplarily shows a further alternative structure diagram of the embodiment of the present invention, as shown in fig. 6, the effluent of the regulating tank 20 flows into the first functional tank 21, the effluent of the first functional tank flows into the first filter tank, the effluent of the first filter tank flows into the second functional tank, and the effluent of the second functional tank flows into the second filter tank, so as to obtain effluent, and the effluent of the first filter tank 22 flows into the backwash clear water tank 23a, and the first filter tank 22 is connected to the effluent of the backwash clear water tank 23a, wherein the second filter tank 25 is also connected to the effluent of the backwash clear water tank 23a, and in case that the second filter tank 25 has a backwash requirement, the effluent of the first filter tank 22 stored in the backwash clear water tank 23a is used as clear water, and passes through the clear water tank 23a to be output 25 to flow into the second filter tank 25, so as to realize backwash of the second filter tank 25, and the effluent of the first filter tank 22 flows into the second filter tank 25 as backwash waste water, so as additional water resource, so as to save the city water for the second filter tank 25; furthermore, the backwash effluent of the first filter 22 flows into the backwash wastewater tank 23b, and the backwash effluent of the second filter 25 also flows into the backwash wastewater tank 23b, so that the backwash wastewater generated by the backwash operation of the second filter 25 can be stored by the backwash wastewater tank 23b at the same time for the next treatment.
In some embodiments, as an alternative implementation, the second functional tank may be an ozonation contact tank and the second filter tank may be an aerobic biofilter.
In the ozone oxidation contact tank, the organic matters which are difficult to degrade in water can be in contact with ozone, and the molecular structures of the organic matters are changed through the oxidation action of the ozone, so that the organic matters which are difficult to degrade in water are removed. In one particular example, the residence time of the wastewater in the ozonation contact tank can be 45min to 60min.
It should be noted that the above example is only an alternative implementation, and should not limit the scope of the present invention. The utility model discloses the parameter in second function pond and second function pond also can correspond the setting to the concrete processing demand of sewage according to the advanced wastewater treatment system.
Wherein, COD in the water can be further removed through the aerobic biofilter. Optionally, the treated water after oxidation flows into the aerobic biofilter, so that saturated dissolved oxygen in the effluent of the contact pond can be oxidized by ozone, and biochemically degradable organic matters in the water can be further removed by the aerobic biofilter. Moreover, the suspended matters in the effluent water of the aerobic biofilter can be ensured to reach the standard through the special design of the filter material in the aerobic biofilter, such as the special design of the size, the material and the like of the filter material. In addition, a medicament can also be added into the aerobic biofilter, for example, a small amount of coagulant is added at the front end of the aerobic biofilter, so that part of inorganic phosphorus in water is converted into inorganic phosphate sediment, and then pollutants are further removed by intercepting suspended matters through the aerobic biofilter.
It can be understood that the first filter and the second filter are both components having filtering functions, and both may have the same structure, and therefore, the structure of the aerobic biofilter may be referred to the structure of the denitrification biofilter, which is not described herein.
Further, in a specific example, the filtering speed of the aerobic biofilter can be 5-8m/h, the removal load per cubic meter of filter material per day can be 0.3-3.0kg/d, and the average backwashing water consumption of a backwashing system can be 4.5-5m 3 /m 2 。
It should be noted that the above example is only an optional implementation, and should not limit the scope of the present invention. The utility model discloses the parameter in second filtering pond and second filtering pond also can correspond the setting to the concrete processing demand of sewage according to the advanced wastewater treatment system.
It needs to be further explained, in the embodiment of the present invention, with the back flush clean water tank is connected to be used for flowing into the water in the back flush clean water tank corresponds the setting as the concrete part of back flush clear water according to the concrete condition that this part handled the water of water out, for example in the embodiment of the present invention the water that the back flush clean water tank inserts also can be the water of second filtering pond, the embodiment of the present invention does not limit to this. In addition, the embodiment of the utility model provides an with the back flush clean water basin with the part that the back flush wastewater disposal basin is connected also can be other parts, as long as have the back flush demand can, its relation of connection is with above-mentioned first filtering pond the second filtering pond, and, the utility model discloses the quantity of the part that has the back flush demand that includes among the deep sewage treatment system of embodiment also can be according to the setting of actual deep sewage treatment demand, the embodiment of the utility model provides an only explain as the example including first filtering pond and second filtering pond, the embodiment of the utility model does not limit to this.
With continued reference to fig. 5 or 6, in some embodiments, the advanced wastewater treatment system may further include a sludge treatment system 26, wherein the sludge treatment system 26 is connected to the first functional tank 21 and the ozone system is connected to the second functional tank 25.
As an optional implementation, after the first functional tank 21 treats the sewage, the pollutants in the sewage can be discharged in the form of sludge in the first functional tank 21, so that the sludge treatment system 26 can access the sludge discharged from the first functional tank 21 for further treatment based on the connection of the sludge treatment system 26 to the first functional tank 21. In a specific example, the first functional tank is a high-efficiency sedimentation tank, and the sludge treatment system is connected to the high-efficiency sedimentation tank (as shown in fig. 6, the sludge treatment system is connected to the first functional tank), and the sludge treatment system treats the sludge produced by the high-efficiency sedimentation tank. Wherein, the sludge amount output by the high-efficiency sedimentation tank treated by the sludge treatment system mainly depends on the content of pollutants in the sewage.
It should be noted that, for the specific structure of the sludge treatment system, the embodiment of the present invention is not limited, as long as the requirement of effectively treating the sludge produced by the first functional tank is satisfied.
In some embodiments, the advanced wastewater treatment system may further comprise an ozone system, wherein the ozone system may be connected to the second functional tank 25.
As an optional implementation, after the first filter 22 treats the sewage, based on that the sewage contains a plurality of pollutants, the pollutant components mainly removed by different sewage treatment processes are different, so that the second functional tank 24 is connected based on an ozone system, and ozone for oxidizing the refractory organics in the sewage can be output to the second functional tank 24 through the ozone system, and further treatment is performed. Wherein, fig. 7 exemplarily shows an alternative structure schematic diagram of the ozone system, as shown in fig. 7, the ozone system may include: an ozone generator 71, a closed loop cooling water system 72, an ozone dosing system 73, and an ozone off-gas destruction system 74.
Ozone is generated by the ozone generator, and then the ozone is added to the second functional pool connected with the ozone system by the ozone adding system, and the ozone which does not react with the refractory organic matters can be removed by the ozone tail gas destruction system because the ozone is harmful gas.
In a toolIn the embodiment, the second functional tank is an ozone oxidation contact tank, and the ozone system is connected with the ozone oxidation contact tank, wherein the adding amount of ozone in the ozone system can be designed according to the COD (chemical oxygen demand) to be removed in water, and O 3 The adding ratio of COD ozone can be 1.5-3kg O 3 /ΔkgCOD。
It should be noted that the above example is only an alternative implementation, and should not limit the scope of the present invention. The utility model discloses ozone system and ozone system's parameter also can correspond the setting to the specific treatment demand of sewage according to sewage advanced treatment system.
It can be seen that, the utility model discloses the advanced wastewater treatment system of sewage effectively realizes the advanced treatment of sewage through combining multiple sewage treatment process to, the advanced wastewater treatment system of sewage carries out the waste water of output among the advanced treatment process to sewage and can flow back to advanced wastewater treatment system as sewage, and carries out advanced treatment once more, effectively improves the sewage rate of utilization, and in addition, the waste water of output need not to arrange outward, has further satisfied the requirement of sewage zero release.
In order to facilitate understanding of the sewage advanced treatment system provided by the embodiment of the utility model, the efficient sedimentation tank, the denitrification biological filter, the ozone oxidation contact tank and the aerobic biological filter are combined in the sewage advanced treatment system, and the improvement of the sewage reuse rate is taken as an example for explanation.
Fig. 8 is a schematic structural diagram schematically illustrating an alternative example of the advanced wastewater treatment system provided by an embodiment of the present invention, and as shown in fig. 8, the advanced wastewater treatment system may include: a regulating tank 81, a high-efficiency sedimentation tank 82, a denitrification biological filter 83, an ozone oxidation contact tank 84, an aerobic biological filter 85, a backwashing clear water tank 86, a backwashing wastewater tank 87 and a sludge treatment system 88. Wherein, the adjusting tank 81, the high-efficiency sedimentation tank 82, the denitrification biological filter 83, the ozone oxidation contact tank 84 and the aerobic biological filter 85 are connected in sequence; the denitrification biological filter 83 and the aerobic biological filter 85 are connected with a back flush clean water tank 86; the denitrification biological filter 83 and the aerobic biological filter 85 are connected with a back flush wastewater pool 87; the backwashing wastewater tank 87 is connected with the regulating tank 81; the high-efficiency sedimentation tank 82 is connected with a sludge treatment system 88.
The sewage firstly enters the regulating tank, is mixed with backwashing wastewater generated by the denitrification biological filter and the aerobic biological filter, and then flows into the high-efficiency sedimentation tank. The effluent water precipitated by the high-efficiency sedimentation tank flows into the denitrification biological filter, and the sludge generated by precipitation enters a sludge treatment system. The effluent filtered by the denitrification biological filter flows into the ozone oxidation contact tank, a small amount of effluent flows into the backwashing clear water tank according to backwashing requirements, and backwashing wastewater of the denitrification biological filter flows into the backwashing wastewater tank. The effluent water oxidized by the ozone oxidation contact tank flows into the aerobic biofilter. The effluent filtered by the aerobic biofilter flows into a clean water tank and is recycled by a reuse water pump room, and the backwashing wastewater of the aerobic biofilter flows into a backwashing wastewater tank. The backwash wastewater is returned to the regulating reservoir as wastewater via the backwash wastewater tank.
The coagulant added in the coagulation zone of the high-efficiency sedimentation tank is PAC (polyaluminium chloride), the set adding concentration is 25mg/L, the flocculant added in the flocculation zone is PAM (polyacrylamide), and the set adding concentration is 0.2mg/L. The filtering speed of the sewage set in the filtering system of the denitrification biological filter is 5-8m/h, the load removal amount per cubic meter of the filtering material per day is 0.43kg/d, for example, the load is NO 3 The effective height of the biological filter material is about 1.5m, the dosage of sodium acetate is 200mg/L, and the average backwashing water consumption in a backwashing system is 4.5-5m 3 /m 2 . The ozone system in the ozone oxidation contact tank is designed according to the amount of COD to be removed, O 3 The ozone adding ratio of the ozone/COD is 1.5-3kg of O3/delta kgCOD, and the ozone adding amount is 15mg/L. The sewage filtering speed set in the filtering system of the aerobic biofilter is 5-8m/h, the load removing amount per cubic meter of filter material per day is 0.35kg/d, the effective height of the biological filter material is about 1.5m, and the average backwashing water consumption in the backwashing system is 4.5-5m 3 /m 2 。
In one embodiment, the maximum water amount of the sewage advanced treatment system is 20000 tons/day, as shown in fig. 8, 20000 tons/day raw water (or sewage) enters the regulating reservoir, the quality index of the inlet water is shown in table 1,
TABLE 1 Water quality index chart
Based on the inflow of raw water, 800 tons of backwashing wastewater flows into the regulating reservoir through the backwashing wastewater pool every day, and the raw water and the backwashing water are mixed by the regulating reservoir to stabilize the water quality and the water quantity of the sewage.
It can be understood that if the inflow water volume in the advanced wastewater treatment system is less than the maximum design value, the advanced wastewater treatment system can operate stably, and in practical application, the actual value of the inflow water volume of wastewater generally does not exceed the maximum design value of the advanced wastewater treatment system.
And (3) the sewage after uniform mixing enters a high-efficiency sedimentation tank, the high-efficiency sedimentation tank is used for treating the sewage to generate sludge with the water content of more than 98%, the sludge enters a sludge treatment system for treatment, and meanwhile, the effluent of the high-efficiency sedimentation tank enters a denitrification biological filter.
800 tons/day of effluent water of the denitrification biological filter after sewage treatment flows into a backwashing clear water tank, and the rest of effluent water flows into an ozone oxidation contact tank, wherein the backwashing period of the denitrification biological filter is 24 hours, the generated backwashing wastewater is 500 tons/day, and the part of backwashing wastewater flows into a backwashing wastewater tank and then flows back to an adjusting tank.
The ozone oxidation contact tank consists of a plurality of lattices, ozone adding points are arranged at the front end, the middle front end and the middle three points, the total ozone adding concentration of the three ozone adding points is 15mg/L, and the contact time is 45min. The backwashing period of the aerobic biofilter is 24 hours, the generated backwashing wastewater is 300 tons/day, and the part of the backwashing wastewater also flows into the backwashing wastewater pool and flows back to the regulating pool. The effluent of the aerobic biofilter flows into a clean water tank for other purposes besides non-drinking water. Wherein, the effluent quality index of the aerobic biofilter is shown in the following table 2:
TABLE 2 effluent quality index chart
By combining the data comparison of various water quality parameters in the table 1 and the table 2, the chemical oxygen demand in water is reduced from 30mg/L to 20mg/L, the biochemical oxygen demand is reduced from 6mg/L to 4mg/L, the amount of suspended matters is reduced by about half per liter, the turbidity of water is obviously improved, the total nitrogen amount is reduced from 15mg/L to 10mg/L, the ammonia nitrogen amount is reduced from 1.5 (2.5) mg/L to 1mg/L, the total phosphorus amount is reduced from 0.3mg/L to 0.1mg/L, and the fecal coliform is reduced from 1000MPN/L to 3 MPN/L. And based on using part of the effluent of the denitrification biological filter as backwash clear water, backwash wastewater can flow back to the regulating reservoir, be mixed with raw water and continue to be subjected to advanced treatment, so that the requirement of zero discharge of sewage is met on the basis of balancing water quality, and the sewage reuse rate is effectively improved.
It should be noted that the above application example is only an optional implementation, and is only an example to help understanding the advanced wastewater treatment system, which should not limit the scope of the present invention. The embodiment of the utility model provides a combination of other sewage treatment processes also can be supported, as long as realize the advanced treatment of sewage to, the combination based on sewage treatment process can effectively improve the sewage reuse rate, satisfy the requirement of sewage zero release can.
While various embodiments of the present invention have been described above, various alternatives described in the embodiments can be combined and cross-referenced without conflict to extend the variety of possible embodiments that can be considered disclosed and disclosed in the embodiments of the present invention.
Although the embodiments of the present invention have been disclosed, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (10)
1. A sewage advanced treatment system is characterized by comprising an adjusting tank, a first functional tank, a first filter tank and a backwashing tank; wherein,
the adjusting tank, the first functional tank and the first filter tank are sequentially connected and used for sequentially treating sewage;
the first filter tank is connected with the backwashing tank and is used for realizing backwashing of the first filter tank;
the backwashing pool is connected with the regulating pool and is used for enabling the wastewater produced by the backwashing pool to flow into the regulating pool as sewage.
2. The advanced wastewater treatment system according to claim 1, wherein the backwash tank comprises at least a backwash clean water tank and a backwash wastewater tank, the backwash clean water tank is used for storing backwash water, and the backwash wastewater tank is used for storing wastewater generated by backwash.
3. The advanced wastewater treatment system according to claim 2, wherein the first filter tank is connected to the backwash tank, and comprises:
the back flushing clean water tank is connected to the water outlet of the first filter tank;
and the backwashing wastewater tank is connected into the backwashing effluent of the first filter tank.
4. The advanced wastewater treatment system according to claim 2, wherein the first filter tank is connected to the backwash tank, and comprises:
and the first filter is connected with the outlet water of the back flushing clean water tank.
5. The advanced wastewater treatment system according to claim 2, wherein the backwash tank is connected to the conditioning tank and comprises:
and the regulating tank is connected with the effluent of the backwashing wastewater tank.
6. The advanced wastewater treatment system according to claim 1, wherein the first functional tank is a high-efficiency sedimentation tank, and the first filter tank is a denitrification biological filter tank.
7. The advanced wastewater treatment system according to claim 1, further comprising: a second functional tank and a second filter tank; wherein,
the first filter tank is connected with the second functional tank, and the second functional tank is connected with the second filter tank and is used for sequentially treating sewage;
the second filter tank is connected with the back washing tank and is used for realizing back washing of the second filter tank.
8. The advanced wastewater treatment system according to claim 7, wherein the second filter tank is connected with the backwash tank, and comprises:
the second filter tank is connected with the outlet water of the backwashing clean water tank;
and the back-flushing outlet water of the second filter tank flows into a back-flushing wastewater tank.
9. The advanced wastewater treatment system according to claim 7, wherein the second functional tank is an ozonation contact tank, and the second filter tank is an aerobic biofilter.
10. The advanced wastewater treatment system according to claim 1, further comprising: and the sludge treatment system is connected with the first functional tank.
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