CN218561239U - Sewage treatment system for improving performance of activated sludge - Google Patents
Sewage treatment system for improving performance of activated sludge Download PDFInfo
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- CN218561239U CN218561239U CN202222835326.9U CN202222835326U CN218561239U CN 218561239 U CN218561239 U CN 218561239U CN 202222835326 U CN202222835326 U CN 202222835326U CN 218561239 U CN218561239 U CN 218561239U
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Abstract
The utility model provides a sewage treatment system for improving the performance of activated sludge, which relates to the field of sewage treatment. The system comprises a biochemical tank, a secondary sedimentation tank, a pneumatic diaphragm pump and a cyclone, wherein a water outlet of the biochemical tank is connected with a water inlet of the secondary sedimentation tank, a sludge discharge port of the secondary sedimentation tank is connected with an inlet of the cyclone through the pneumatic diaphragm pump, and a underflow port of the cyclone is connected with the biochemical tank. The utility model discloses a swirler dams the activated sludge that the performance is good effectively and returns biochemical pond, has improved the quantity of microorganism body in the system, has improved the settlement performance and the sludge activity of mud, has increased sewage treatment efficiency. Simultaneously the utility model discloses combine pneumatic diaphragm pump, replace the centrifugal sludge recirculation pump that this field of conventionality used, can effectively avoid the destruction to the mud floc among the transportation process to can more effectual settlement performance who improves mud.
Description
Technical Field
The utility model relates to a sewage treatment field, concretely relates to improve sewage treatment system of activated sludge performance.
Background
The activated sludge process is a sewage treatment process for adsorbing and removing suspended matters and soluble impurities in water, decomposing organic matters and removing nitrogen and phosphorus pollutants. The activated sludge process and the derivative improvement process thereof become the most widely used method for treating urban sewage due to the advantages of good effect, high efficiency, wide application range, mature technology and the like.
Activated sludge is a collective term for microbial populations and the organic and inorganic substances to which they are attached, and microbial populations are key to the purification of sewage. The microbial population in the activated sludge comprises: bacteria, protozoa, fungi, metazoans and the like convert organic matters in the sewage into inorganic matters through a metabolic mechanism of the bacteria, the protozoas, the fungi, the metazoans and the like, thereby achieving the aim of purifying the water. In general, the MLVSS/MLSS ratio of activated sludge for treating domestic sewage is about 0.75, and the more microorganisms in the activated sludge are, the better the treatment efficiency is, but the MLVSS/MLSS ratio is lower in many current sewage treatment plants. The key to the optimal benefit of the activated sludge method is the performance of the activated sludge, and the settleability is one of the key indexes of the sludge performance and directly influences the normal operation of the subsequent treatment process.
The excess sludge produced in the biochemical process also contains sludge with better activity, but the sludge after biochemical treatment is basically discharged into a secondary sedimentation tank at present, and directly enters a sludge treatment stage or partially flows back after sludge-water separation, so that a large amount of waste of activated sludge resources is caused, and the task amount of subsequent sludge treatment is increased. Therefore, the recovery of sludge with good biochemical performance and the continuous feeding of the sludge into the biochemical treatment stage to increase the number of microbial populations and the settleability of the sludge and further improve the performance of activated sludge are significant in the field of sewage treatment, which is a technical problem to be solved in the field.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the active sludge performance among the prior art poor and cause the defect of a large amount of wasting of resources easily to provide a sewage treatment system who improves the active sludge performance.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides an improve sewage treatment system of activated sludge performance, including biochemical pond, two heavy ponds, pneumatic diaphragm pump and swirler, biochemical pond the delivery port with two heavy ponds's water inlet are connected, two heavy ponds's row mud mouth passes through pneumatic diaphragm pump with the access connection of swirler, swirler's underflow mouth with biochemical pond is connected.
Furthermore, the number of the cyclones is at least two, and the cyclones are connected in parallel.
Furthermore, the swirler comprises a hollow cylinder and a hollow inverted cone which is positioned below the hollow cylinder and connected with the hollow cylinder, wherein the side surface of the cylinder is provided with an inlet, the top surface of the cylinder is provided with an overflow port, and the bottom of the inverted cone is provided with a bottom flow port.
Furthermore, the inner diameter of the cylinder is 100-165 mm, and the height is 975-1892 mm; the diameter of the inlet is 32-65 mm, the diameter of the overflow port is 32-80 mm, and the diameter of the underflow port is 25-32 mm.
Further, the inner diameter of the cylinder is 165mm, and the height is 1250mm; the diameter of the inlet is 65mm, the diameter of the overflow port is 80mm, and the diameter of the underflow port is 32mm.
Furthermore, the discharge ratio of the cyclone is less than 0.5, and the taper of the cyclone is less than 15 degrees.
Further, the swirler taper is 8 °.
Further, a valve, a buffer and a pressure gauge are arranged between the pneumatic diaphragm pump and the cyclone.
Further, the biochemical pool comprises an oxidation ditch.
Furthermore, the sewage treatment system for improving the performance of the activated sludge also comprises a sludge storage tank connected with an overflow port of the cyclone.
The utility model discloses technical scheme has following advantage:
the utility model provides an improve sewage treatment system of activated sludge performance sets up pneumatic diaphragm pump and swirler behind the secondary sedimentation pond, can realize conveying the mud that the secondary sedimentation pond mud discharging mouth discharged through pneumatic diaphragm pump to the swirler in, the mud of thinner granule is because the centrifugal force that receives is little, makes interior whirl discharge from the overflow mouth, then enters the sludge treatment stage; and the coarse and heavy sludge particles move downwards along the axial direction and outwards along the radial direction under the action of the rotational flow field, finally flow out from the underflow port and flow back to the biochemical tank, and then enter the biochemical treatment stage again to continuously purify the sewage.
Generally, microorganisms having a slow growth rate tend to grow into a dense and stable biofilm, and thus have a higher relative specific gravity. Therefore, the sludge with large specific gravity is composed of microorganisms with long generation cycle such as phosphorus accumulating bacteria and nitrifying bacteria. Through cyclone screening, the sludge with large backflow specific gravity is beneficial to the enrichment of microorganisms with long times of period, such as nitrobacteria, phosphorus accumulating bacteria and the like, in a system, and can form granular sludge with the grain diameter of about 1mm, and the granular sludge is dense and is not easy to break.
The utility model discloses a swirler dams the activated sludge that the performance is good effectively and returns biochemical pond, has improved the quantity of microorganism body in the system, has improved the settlement performance and the sludge activity of mud, has increased sewage treatment efficiency. Simultaneously the utility model discloses combine pneumatic diaphragm pump, replace the centrifugal sludge reflux pump that the field is conventional to be used, can effectively avoid the destruction to the mud floc among the transportation to can more effectual settlement performance who improves mud.
Experimental research shows that the pneumatic diaphragm pump can not change the particle size distribution of the sludge, the combination of the pneumatic diaphragm pump and a subsequent cyclone can accelerate the granulation of the sludge, the occupation ratio of the granular sludge in the system can be improved after long-time operation, and the sludge has high activity and good settling property. In addition, compared with a centrifugal sludge reflux pump, the pneumatic diaphragm pump has the advantages of simple structure, difficulty in blockage, convenience in maintenance and energy conservation.
To sum up, the utility model discloses select the combination of pneumatic diaphragm pump and swirler can show the performance that improves mud, the treatment effeciency of reinforcing sewage factory. Meanwhile, the system has the advantages of low cost, small occupied area, simple device, easy operation, high efficiency and capability of improving the performance of the activated sludge in engineering.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view showing the connection relationship of a sewage treatment system for improving the performance of activated sludge according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a swirler in an embodiment of the present invention.
Reference numerals are as follows:
1-a biochemical pool; 2-secondary sedimentation tank; 3-a pneumatic diaphragm pump; 4-a swirler; 41-cylinder; 42-inverted cone; 43-inlet; 44-overflow port; 45-underflow port; and 5, a sludge storage pool.
Detailed Description
The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood 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 efforts all belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
As shown in figure 1, the utility model provides an improve sewage treatment system of activated sludge performance, including biochemical pond 1, two heavy ponds 2, pneumatic diaphragm pump 3 and swirler 4, the delivery port of biochemical pond 1 is connected with the water inlet of two heavy ponds 2, and the mud discharging mouth of two heavy ponds 2 passes through pneumatic diaphragm pump 3 to be connected with the import 43 of swirler 4, and the underflow opening 45 of swirler 4 is connected with biochemical pond 1.
The utility model provides an improve sewage treatment system of activated sludge performance sets up pneumatic diaphragm pump 3 and swirler 4 behind two heavy ponds 2, can realize through pneumatic diaphragm pump 3 with two heavy ponds 2 mud discharge port exhaust mud carry swirler 4 in, the mud of thinner granule is because the centrifugal force that receives is little, does the interior whirl and discharges from overflow mouth 44, then enters the sludge treatment stage; and the coarse and heavy sludge particles move downwards along the axial direction and outwards along the radial direction under the action of the rotational flow field, finally flow out from the underflow port 45 and flow back to the biochemical tank 1, and enter the biochemical treatment stage again to continuously purify sewage. The sludge at the underflow port 45 has a large specific gravity, and contains more microorganisms with a long generation period, such as phosphorus-accumulating bacteria and nitrifying bacteria, and the sludge is refluxed to facilitate the enrichment of the phosphorus-accumulating bacteria and the nitrifying bacteria and the formation of granular sludge.
The utility model discloses a swirler 4 dams the activated sludge that the performance is good effectively and returns biochemical pond 1, has improved the quantity of the interior microbial community of system, has improved the settlement performance and the sludge activity of mud, has increased sewage treatment efficiency. Simultaneously the utility model discloses combine pneumatic diaphragm pump 3, replace the centrifugal sludge reflux pump that the field conventionality used, can effectively avoid the destruction to the mud floc among the transportation to can more effectively improve the settlement performance of mud.
Biochemical pond 1 be the main link among the sewage treatment system for thereby carry out innocent treatment with organic pollutant through activated sludge and carry out aerobic or anaerobism metabolism with the organic pollutant in the waste water as nutrient substance and turn into carbon dioxide and water and reach emission standard. The kind of the biochemical pond 1 can be selected and adjusted by those skilled in the art, for example, when an oxidation ditch process is used, the biochemical pond 1 refers to an oxidation ditch, and when an anaerobic-anoxic-aerobic process (AAO process) is used, the biochemical pond 1 refers to an anaerobic pond, an anoxic pond and an aerobic pond which are connected in sequence. The utility model discloses do not restrict it, other kinds of biochemical pond 1 among the prior art can also be selected to the technical staff in the field, all are in the utility model discloses the within range of requesting protection.
It should be noted that the utility model discloses still can set up grit chamber, preliminary sedimentation pond etc. as required at biochemical pond 1 front end for carry out the preliminary treatment to sewage, get rid of the easy inorganic particulate matter that subsides of aquatic and the great solid suspended particle of density etc. to protection water pump and pipeline are avoided wearing and tearing, are alleviateed biological treatment's organic load, improve the activity of microorganism etc. among the activated sludge. Preprocessing device and method all belong to prior art, the utility model discloses do not describe to this again.
The secondary sedimentation tank 2, also called secondary sedimentation tank or final sedimentation tank (final sedimentation tank), is a treatment structure for removing suspended particles with density greater than water from water by using gravity sedimentation for mud-water separation, making mixed liquid clarification, sludge concentration and respectively carrying out subsequent treatment. The man skilled in the art can adjust the processing scale and kind according to the needs, all within the scope of the claimed invention.
The pneumatic diaphragm pump 3 is a conveying machine using compressed air as a power source, is not conventionally applied to the field, and does not adopt a scheme combined with the cyclone 4. Compared with a centrifugal sludge reflux pump which is conventionally used in the field, the pneumatic diaphragm pump 3 does not damage sludge flocs.
As an optional embodiment of the present invention, the number of the cyclones 4 is at least two, and the cyclones are connected in parallel. Specifically, a water inlet main pipe at the front end of the cyclone 4 is provided with a plurality of branch pipes, and water is uniformly distributed to the plurality of cyclones 4 from the center position through the branch pipes. Underflow sludge of the cyclones 4 is merged and then or respectively reflows to the front end biochemical pool 1.
As an optional embodiment of the present invention, a valve, a buffer and a pressure gauge are further provided between the pneumatic diaphragm pump 3 and the swirler 4. The amount of flow into the cyclone 4 can be controlled by adjusting the valve. Since the pneumatic diaphragm pump 3 intermittently pumps the sewage in the operation process, the water flow at the outlet is not uniform, and a buffer is added to stabilize the water flow so that the water flow can uniformly flow to the cyclone 4. The pressure gauge is used for measuring the pressure of the sewage entering the cyclone 4. The valve is arranged in front of the cyclone 4, so that the flow entering the cyclone 4 can be adjusted. The above elements can be selectively adjusted by those skilled in the art.
As an alternative embodiment of the present invention, as shown in fig. 2, the cyclone 4 is composed of a hollow cylinder 41 and a hollow inverted cone 42 connected to the hollow cylinder and located below the hollow cylinder 41, the side surface of the cylinder 41 is provided with an inlet 43, the top surface is provided with an overflow port 44, and the bottom of the inverted cone 42 is provided with a bottom flow port 45. The specific specification and length can be selected as required, for example, the inner diameter of the cylinder 41 is 100-165 mm, and the height is 975-1892 mm; the diameter of the inlet 43 is 32-65 mm, the diameter of the overflow outlet 44 is 32-80 mm, and the diameter of the underflow outlet 45 is 25-32 mm. The discharge ratio of the cyclone 4 is less than 0.5, and the taper of the cyclone 4 is less than 15 degrees. Preferably, the inner diameter of the cylinder 41 is 165mm, the height thereof is 1250mm, the cone angle (swirler taper) of the inverted cone 42 is 8 degrees, the diameter of the inlet 43 is 65mm, the diameter of the overflow port 44 is 80mm, the diameter of the underflow port 45 is 32mm, and the discharge ratio of the swirler 4 is less than 0.5.
As an optional embodiment of the present invention, the system further comprises a sludge storage tank 5 connected to the overflow port 44 of the cyclone 4, for collecting the sludge with low specific gravity screened by the cyclone 4 for subsequent sludge treatment. The skilled in the art can adjust the processing scale and kinds according to the requirement, all of which are within the protection scope of the present invention.
The following is a specific description of the operation method of the sewage treatment system for improving the performance of the activated sludge provided by the utility model, and the operation steps of the system are as follows:
introducing the sewage into a biochemical tank 1 for biochemical treatment;
discharging sewage and sludge in the biochemical tank 1 into a secondary sedimentation tank 2 for sludge-water separation;
conveying the sludge flowing out of the sludge discharge port of the secondary sedimentation tank 2 into a cyclone 4 through a pneumatic diaphragm pump 3;
screening the sludge through a cyclone 4, and discharging the underflow sludge into a biochemical tank 1 for biochemical treatment of the sewage again;
the overflow sludge of the cyclone 4 is discharged into a sludge storage tank 5.
The skilled person can select and control each part of the system according to the actual need, preferably, the sludge reflux amount (the ratio of the sludge reflux amount to the water inlet flow rate) of the system is controlled to be 100%, and the treatment scale of the cyclone 4 is controlled to account for 5% -10% of the sludge reflux amount. Preferably, the wastewater is pretreated before entering the biochemical pond 1. For example, sewage is passed through a grit chamber and a primary settling chamber in this order.
The technical solution provided by the present invention will be further described in detail with reference to a specific embodiment.
Examples
The embodiment provides a sewage treatment system (adopting an oxidation ditch process) which is implemented in a certain sewage treatment plant and mainly comprises an Obel type oxidation ditch, a secondary sedimentation tank, a pneumatic diaphragm pump and two cyclones.
The sewage plant treatment scale is 2 ten thousand m3/d, the oxidation ditch is of a combined type (combination of a semicircular structure and a rectangular structure) reinforced concrete structure, 2 seats and an effective volume of 6044m 3/seat, and the rotating speed of the rotary butterfly is adjusted by a speed regulating motor according to the reading of a dissolved oxygen meter in the ditch, so that the content of dissolved oxygen in each channel is controlled. The secondary sedimentation tank is a sedimentation tank which is independently arranged for controlling the return flow of sludge and ensuring the solid-liquid separation effect, the sewage plant adopts a radial flow sedimentation tank with water outlet at the periphery of the central water inlet, the secondary sedimentation tank is of a reinforced concrete structure, 2 seats and 30m in diameter and is provided with 2 peripheral transmission mud scrapers. The treatment scale of the pneumatic diaphragm pump is 60m3/h, and the lift is 10m. The cyclone screening system is designed according to the treatment capacity of the whole sewage treatment plant of 2 ten thousand m3/d, the sludge return flow of the sewage treatment plant of 100 percent and the treatment scale of the cyclone accounting for 6 percent of the sludge return flow, the inner diameter of the cyclone is 160mm, the number of the cyclones is 2, and the single treatment scale is about 30m3/h.
The water outlet of the oxidation ditch is connected with the water inlet of the secondary sedimentation tank, the sludge discharge port of the secondary sedimentation tank is connected with the water inlet main pipeline of the cyclone through the pneumatic diaphragm pump, the water inlet main pipeline is provided with a valve, a buffer and a pressure gauge, the water inlet main pipeline is divided into two parts and is respectively connected with the inlets of the two cyclones (namely the two cyclones are connected in parallel), the underflow port of the cyclone is connected with the biochemical tank, and the overflow port of the cyclone is connected with the sludge storage tank.
The operation method of the sewage treatment system provided by the embodiment is as follows:
introducing pretreated sewage into an oxidation ditch for biochemical treatment;
discharging sewage and sludge in the oxidation ditch into a secondary sedimentation tank for sludge-water separation;
adjusting a valve on a water inlet main pipeline of the cyclone to adjust to proper flow and pressure, and dividing sludge in a sludge discharge pump room and a water distribution well of the secondary sedimentation tank into two parts through the water inlet main pipeline by a pneumatic diaphragm pump to uniformly distribute water to the two cyclones from the central position;
screening sludge through the swirler, based on receiving the difference of centrifugal force size, the centrifugal force that coarse and heavy mud granule received is big, makes outer whirl motion, flows into the outer ditch of oxidation ditch side by the underflow opening of swirler, reentrants biochemical treatment stage, and the mud of thinner granule is because the centrifugal force that receives is little, makes interior whirl motion, discharges and flow to the mud storage pond by the overflow opening of swirler, gets into the sludge treatment stage afterwards.
Experimental example 1
The influence of the pneumatic diaphragm pump and the cyclone on the sludge performance and the sewage treatment effect is verified through the experimental example, and the specific experimental method comprises the following steps:
and measuring the water quality parameters of the water outlet of the oxidation ditch and the property parameters of sludge in the oxidation ditch before the pneumatic diaphragm pump and the cyclone are installed, and then measuring the water quality parameters of the water outlet of the oxidation ditch and the property parameters of the sludge in the oxidation ditch after the pneumatic diaphragm pump and the cyclone are installed and operated for 3 months according to the operation method provided by the embodiment. The measured relevant water quality parameters include: chemical Oxygen Demand (COD), biochemical oxygen demand (BOD 5), ammonia nitrogen, total nitrogen and total phosphorus, and the measured property parameters of the sludge comprise: the Sludge Volume Index (SVI), the mixed liquor suspended solid concentration (MLSS), the mixed liquor volatile suspended solid mass concentration (MLVSS) and the sludge particle size are measured, and VSS/MLSS represents the proportion of effective microorganisms per unit volume so as to determine the improvement effect of the system on sludge. The detection method of each index refers to a related national standard detection method.
The measurement results were as follows:
the effluent quality and sludge properties before installation of the pneumatic diaphragm pump and cyclone were as follows: 56mg/L of COD, 21mg/L of BOD, 1.0mg/L of ammonia nitrogen, 16mg/L of total nitrogen, 0.4mg/L of total phosphorus, 4500mg/L of MLSS, 2100mg/L of MLVSS and 98 of SVI, and the grain size range of the sludge is about 50-100 mu m.
The effluent quality and sludge properties after installation of the pneumatic diaphragm pump and the cyclone are as follows: 29mg/L of COD, 10mg/L of BOD5, 0.3mg/L of ammonia nitrogen, 9mg/L of total nitrogen, 0.2mg/L of total phosphorus, 3700mg/L of MLSS, 2850mg/L of MLVSS, 58 of SVI, 50-1200 mu m of sludge grain size and about 15% of sludge with the grain size of 800-1200 mu m.
Therefore, after the system runs for 3 months, the microbial biomass in the oxidation ditch is obviously increased, the ratio of VSS/MLSS is increased and can reach 0.77, and large-particle sludge is obviously increased, which proves that the sludge performance is obviously improved, and the sewage treatment effect is obviously improved.
Experimental example 2
Compared with a centrifugal sludge reflux pump, the experimental method for verifying the influence of the pneumatic diaphragm pump on the sludge performance is as follows:
according to the system and the operation method provided by the embodiment, comparison experiments are carried out under the same conditions, one group is provided with the pneumatic diaphragm pump, the other group is provided with the centrifugal pump (with the flow rate of 60m < 3 >/h and the lift of 10 m) with the same flow rate and the same lift, and when the two groups of experiments are operated on the 60 th day, the sludge floc particle size before and after entering the pneumatic diaphragm pump and the centrifugal pump, the SV30 of sludge in an oxidation ditch, the sludge particle size distribution and the sludge respiration rate (the sludge particle size distribution adopts a laser particle size analyzer, and the sludge respiration rate is obtained by measuring the aerobic rate of the sludge) are measured respectively.
The results of the measurement were as follows:
1. the grain size of the sludge flocs is reduced by 3 percent compared with that before entering the centrifugal pump, and the grain size of the sludge flocs is not changed after passing through the pneumatic diaphragm pump;
2. when a centrifugal pump is adopted, the SV30 value is 29 percent, and when a pneumatic diaphragm pump is adopted, the SV30 value is 21 percent;
3. sludge breathing when centrifugal pump is adoptedThe absorption rate is 10mgO 2 PergMLVSS.h, the breathing rate of the sludge is 25mgO when the pneumatic diaphragm pump is adopted 2 /gMLVSS·h；
4. When a centrifugal pump is adopted, the particle size distribution range of the sludge is 10-50 mu m, and when a pneumatic diaphragm pump is adopted, the particle size distribution of the sludge is 30-1000 mu m.
The above results were further analyzed:
the activated sludge floc is mainly formed by a series of complex biological polymerization processes of microorganisms, extracellular Polymeric Substances (EPS), organic matters in raw water, inorganic particles and the like, the SV30 of common activated sludge is generally 10-50%, and the respiration rate is generally 8-20 mgO 2 The grain diameter of the sludge is generally 50 to 60 mu m, and the sludge grains with the diameter of 1mm are basically not existed. Compared with the influence of two different types of pumps, namely a centrifugal pump and a pneumatic diaphragm pump, on sludge flocs through experiments, the result shows that the shearing action generated by the centrifugal pump has larger damage to the sludge flocs, can change the aggregation property of microorganisms, change the structure of the flocs and reduce the sludge particle size, so that the sedimentation performance of the sludge is reduced, and the respiratory rate is reduced. The pneumatic barrier pump does not influence sludge flocs, and after long-time operation, the sedimentation performance of the sludge can be obviously improved by combining the screening reflux effect of the cyclone, active substances in the system are obviously increased, the proportion of the large-particle-size granular sludge is also increased, particularly, the SV30 of the sludge can be reduced to about 20%, and the respiratory rate is increased to 25mgO 2 The ratio of sludge with the grain diameter of about 1mm to the gMLVSS.h is about 15 percent, and the huge breakthrough of the field is realized.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The sewage treatment system for improving the performance of the activated sludge is characterized by comprising a biochemical tank, a secondary sedimentation tank, a pneumatic diaphragm pump and a cyclone, wherein a water outlet of the biochemical tank is connected with a water inlet of the secondary sedimentation tank, a sludge discharge port of the secondary sedimentation tank is connected with an inlet of the cyclone through the pneumatic diaphragm pump, and a underflow port of the cyclone is connected with the biochemical tank.
2. The activated sludge performance improving sewage treatment system of claim 1 wherein the number of said cyclones is at least two, and said cyclones are connected in parallel.
3. The sewage treatment system for improving the performance of activated sludge according to claim 1, wherein the cyclone is composed of a hollow cylinder and a hollow inverted cone which is positioned below and connected with the hollow cylinder, the side surface of the cylinder is provided with an inlet, the top surface of the cylinder is provided with an overflow port, and the bottom of the inverted cone is provided with a bottom flow port.
4. The sewage treatment system for improving the performance of activated sludge according to claim 3, wherein the inner diameter of the cylinder is 100 to 165mm, and the height is 975 to 1892mm; the diameter of the inlet is 32-65 mm, the diameter of the overflow port is 32-80 mm, and the diameter of the underflow port is 25-32 mm.
5. The sewage treatment system for improving the performance of activated sludge according to claim 4, wherein the inner diameter of the cylinder is 165mm, and the height thereof is 1250mm; the diameter of the inlet is 65mm, the diameter of the overflow port is 80mm, and the diameter of the underflow port is 32mm.
6. The sewage treatment system for improving the performance of activated sludge according to claim 1, wherein the discharge ratio of the cyclone is less than 0.5, and the taper of the cyclone is less than 15 °.
7. The sewage treatment system for improving the performance of activated sludge according to claim 6, wherein the taper of the cyclone is 8 °.
8. The sewage treatment system for improving the performance of activated sludge according to claim 1, wherein a valve, a buffer and a pressure gauge are further arranged between the pneumatic diaphragm pump and the cyclone.
9. The sewage treatment system for improving the performance of activated sludge according to claim 1, wherein the biochemical tank comprises an oxidation ditch.
10. The sewage treatment system for improving the performance of activated sludge according to claim 1, further comprising a sludge storage tank connected with an overflow port of the cyclone.
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