Wastewater treatment system

Abstract

The utility model provides a wastewater treatment system which comprises a sewage collecting tank communicated with a pretreatment unit. The pretreatment unit comprises a separation tank and a regulating tank; a purifying unit and a water purifying tank are sequentially connected behind the regulating tank. And the separation tank is divided into an upper material separation tank and a lower liquid collection tank by a filter plate. A feeding port communicated with the sewage collecting pool is formed in the top of the material distributing groove, and an auger is installed in the material distributing groove and driven by a motor on the outer wall of the material distributing groove. The end, away from the feeding port, of the material distributing groove further communicates with a solid slag conveying device, and the tail end of the solid slag conveying device is connected to the waste slag groove. A liquid outlet communicated with the adjusting tank is formed in the bottom of the side wall of the liquid collecting tank. According to the utility model, solid wastes in wastewater are filtered through the separation tank, manual operation is not needed in the process of filtering and transferring the solid wastes, the phenomenon that the solid wastes on the grating need to be manually treated in the prior art is avoided, time and labor are saved, convenience and rapidness are realized, and the wastewater treatment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field especially relates to a wastewater treatment system. BACKGROUND

[0002] In daily life, the main sources of wastewater are two, one is the wastewater discharged in daily life of residents, and the other is the collected rainwater. The pollutants contained in wastewater can be divided into two categories, insoluble and soluble, among which the soluble pollutants are mainly organic matter (such as protein, urea and ammonia nitrogen, etc.) and bacteria and pathogens which take organic matter as nutrients. Insoluble pollutants are various types of solid waste (such as silt, paper towels, tree branches and leaves, plastics, etc.). In order to avoid pollution to the natural environment and waste of water resources, these wastewaters are generally purified before being discharged or recycled.

[0003] The first step of wastewater treatment is to filter the solid waste in wastewater for subsequent purification treatment. The wastewater treatment system in the prior art often uses a grid to filter the solid matter such as garbage in wastewater. With the increase of wastewater treatment capacity, the solid matter on the grid will gradually increase. The increase of solid matter on the grid will lead to a decrease in wastewater flow or even blockage, at which time the solid matter on the grid needs to be cleaned manually, which not only takes time and effort, but also affects the efficiency of wastewater treatment. SUMMARY

[0004] The utility model provides a wastewater treatment system to solve the problem of low efficiency of filtering solid matter in wastewater in prior art.

[0005] The utility model provides a wastewater treatment system, including the collection of sewage pool, and the collection of sewage pool is linked with the pretreatment unit. The pretreatment unit includes the separation pool and the adjustment pool. The adjustment pool is connected with the purification unit and the water purification tank in proper order. The separation pool is divided into the upper distribution chute and the lower liquid collecting tank by the filter plate. The distribution chute top is provided with the feed inlet which is linked with the collection of sewage pool, and the distribution chute is installed with the auger, and the auger is driven by the motor on the outer wall of the distribution chute. The end of the distribution chute which is far away from the feed inlet is also communicated with the solid residue transport device, and the tail end of the solid residue transport device is connected to the waste residue groove. The side wall bottom of the liquid collecting tank is provided with the liquid outlet which is communicated with the adjustment pool.

[0006] Optionally, the solid residue transport device is a screw conveyor, and a plurality of filter holes are uniformly arranged on the bottom of the screw conveyor along the material flow direction, and the filter holes are communicated with the liquid collecting tank.

[0007] Optionally, the bottom of the liquid collecting tank is provided with an inclined slope, and the end of the inclined slope close to the liquid outlet is the bottom end, and the end of the inclined slope far away from the liquid outlet is the high end.

[0008] Optionally, the baffle is also installed on the positions of the two ends of the auger close to the end surface of the distribution chute.

[0009] Optionally, the top of the distribution chute is uniformly provided with a plurality of flushing nozzles along the length direction, and the flushing nozzles are connected with a water source through pipelines.

[0010] Optionally, the purification unit comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank connected in sequence.

[0011] Optionally, the sedimentation tank is also connected with the flushing nozzles through a clean water pump and connected with the sludge tank and the anaerobic tank through a sludge pump.

[0012] Optionally, the sludge tank is further connected with a plate-and-frame filter press, and a filtrate outlet of the plate-and-frame filter press is connected to the disinfection tank.

[0013] The beneficial effects of the wastewater treatment system provided by the utility model include: 1. The solid waste in the wastewater is filtered through the separation tank, manual operation is not needed in the process of solid waste filtering and transferring, the phenomenon that the solid waste on the existing technology needs manual treatment is avoided, time and labor are saved, it is convenient and fast, and the efficiency of wastewater treatment is improved.

[0014] 2. The filter holes in communication with the liquid collecting groove are arranged at the bottom of the screw conveyor, the moisture in the solid waste in the transportation is further filtered, the difficulty of subsequent solid waste treatment is reduced, and the recovery rate of water resources is improved.

[0015] 3. The flushing nozzles are installed at the top of the distribution chute, the distribution chute and the auger therein can be flushed, the smoothness of system operation is improved. The supernatant of the sedimentation tank is used as the water source of the flushing nozzles, external water source is not used, the utilization efficiency of resources is improved, and the cost is reduced. DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 The structural schematic diagram of the wastewater treatment system provided by the utility model embodiment is shown in the figure.

[0018] Figure 2 The structural schematic diagram of the separation tank and the solid residue transportation device provided by the utility model embodiment is shown in the figure.

[0019] Figure 3 The internal structure schematic diagram of the separation tank provided by the utility model embodiment is shown in the figure.

[0020] Figure 4 A perspective view of a separation tank and solid residue transporting device provided by the embodiment of the present application is provided.

[0021] Figure 5 A structure schematic view of a wastewater treatment system provided by the embodiment of the present application is provided.

[0022] Explanation of reference signs:

[0023] 1 - a sewage collection tank, 2 - a pretreatment unit, 3 - a purification unit, 4 - a clean water tank, 21 - a separation tank, 22 - an adjusting tank, 31 - an anaerobic tank, 32 - an anoxic tank, 33 - an aerobic tank, 34 - a sedimentation tank, 35 - a disinfection tank, 36 - a sludge tank, 37 - a plate-and-frame filter press, 210 - a filter plate, 211 - a distribution groove, 212 - a liquid collection groove, 213 - a feeding port, 214 - an auger, 215 - a motor, 216 - a solid residue transporting device, 217 - a waste residue groove, 218 - a liquid discharge port, 219 - a filter hole, 220 - a slope, 221 - a baffle, 222 - a flushing nozzle, 341 - a clean water pump, 342 - a sludge pump. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiment of the present application more clear, the technical scheme in the embodiment of the present application is described clearly and completely below. Obviously, the described embodiment is a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present application.

[0025] As shown in Figures 1-5 The present application provides a wastewater treatment system, which comprises a sewage collection tank 1, and the sewage collection tank 1 is communicated with a pretreatment unit 2. The pretreatment unit 2 comprises a separation tank 21 and an adjusting tank 22. The adjusting tank 22 is sequentially connected with a purification unit 3 and a clean water tank 4. The separation tank 21 is divided into a distribution groove 211 at the upper part and a liquid collection groove 212 at the lower part by a filter plate 210. The distribution groove 211 is provided with a feeding port 213 communicated with the sewage collection tank 1 at the top, and an auger 214 is installed in the distribution groove 211, and the auger 214 is driven by a motor 215 on the outer wall of the distribution groove 211. The end of the distribution groove 211 away from the feeding port 213 is also communicated with a solid residue transporting device 216. The end of the solid residue transporting device 216 is connected to a waste residue groove 217, and the bottom of the side wall of the liquid collection groove 212 is provided with a liquid discharge port 218 communicated with the adjusting tank 22.

[0026] The wastewater treatment system, in operation, wastewater from a wastewater pipeline first enters a collecting tank 1 for collection, then the wastewater in the collecting tank 1 enters a pretreatment unit 2 and a purification unit 3 in turn for purification treatment, and after the purification is completed, enters a clean water tank 4 for storage. The clean water in the clean water tank 4 can be discharged to a river or sent to a user water network for use according to the requirement. The main function of the pretreatment unit 2 is to filter solid waste in the wastewater, and after the filtration is completed, the pH value of the wastewater is adjusted to meet the requirement of subsequent purification. The purification unit 3 is to perform relevant biochemical treatment on the wastewater to make the water quality reach the specified value.

[0027] The pretreatment unit 2 comprises a separation tank 21 and an adjusting tank 22. The two are respectively used for filtering solid waste in the wastewater and adjusting the pH value of the wastewater.

[0028] The separation tank 21 is composed of a distribution tank 211, a liquid collecting tank 212 and a solid residue conveying device 216. The distribution tank 211 is used for receiving wastewater from the collecting tank 1 and filtering the wastewater. The liquid collecting tank 212 is used for receiving filtrate (filtered wastewater) in the distribution tank 211 and sending the filtrate to the adjusting tank 22. The solid residue conveying device 216 is used for receiving solid waste from the distribution tank 211 and sending the solid waste to a solid residue tank 217 for unified collection. The working process of the separation tank 21 and each part thereof is as follows:

[0029] Wastewater from the collecting tank 1 enters the distribution tank 211 through an inlet 213 at the top of the distribution tank 211. A screw conveyor 214 driven by a motor 215 is installed in the distribution tank 211. Solid waste is transported forward along the screw conveyor 214 under the transportation of the screw conveyor 214, and wastewater flows downward into the liquid collecting tank 212 through a filter plate 210. After the solid waste is sent to the end of the distribution tank 211 by the screw conveyor 214, the solid waste enters the solid residue conveying device 216 and is sent to the solid residue tank 217 by the solid residue conveying device 216 for unified treatment.

[0030] The wastewater treatment system provided by the utility model filters solid waste in wastewater by the separation tank 21. In the filtration process, the screw conveyor 214 and the solid residue conveying device 216 work together to transfer the solid waste to the solid residue tank 217. In the process of filtering and transferring the solid waste, manual operation is not required, which avoids the phenomenon that solid waste on the grid needs to be manually treated in the prior art, saves time and effort, is convenient and fast, and improves the efficiency of treating wastewater.

[0031] As shown in Figure 3 and Figure 4 , further, the solid residue conveying device 216 is a spiral conveyor, and a plurality of filter holes 219 are uniformly formed in the bottom of the spiral conveyor along the material flow direction, and the filter holes 219 are in communication with the liquid collecting tank 212.

[0032] The solid residue conveying device 216 adopts a screw conveyor. When the screw conveyor conveys the materials, the materials will be continuously thrown in the conveyor, so as to throw out the waste water mixed in the solid waste. The bottom of the screw conveyor is uniformly provided with a plurality of filter holes 219 along the material flow direction. In the process of conveying the solid waste to the waste residue tank 217, the waste water will flow out from the filter holes 219 and enter the liquid collecting tank 212 through the pipeline. By opening the filter holes 219, the water content of the solid waste entering the waste residue tank 217 can be reduced, the difficulty of subsequent solid waste treatment is reduced, and the water resource recovery rate is improved.

[0033] As shown in Figure 3 and Figure 4 , further, the bottom of the liquid collecting tank 212 is provided with a slope 220. The end of the slope 220 close to the liquid outlet 218 is the bottom end, and the end far away from the liquid outlet 218 is the high end.

[0034] The slope 220 is arranged at the bottom of the liquid collecting tank 212. When the waste water in the liquid collecting tank 212 is discharged into the adjusting tank 22, the waste water in the liquid collecting tank 212 can be discharged as completely as possible through the action of the slope 220.

[0035] As shown in Figure 3 , further, the auger 214 is further provided with a baffle 221 at the positions close to the end surface of the material distribution tank 211.

[0036] The baffle 221 is arranged at the two ends of the auger 214, which can improve the sealing performance of the material distribution tank 211 and avoid the waste water from seeping out from the connection between the auger 214 and the motor 215.

[0037] As shown in Figures 2-4 , further, a plurality of flushing nozzles 222 are uniformly arranged on the top of the material distribution tank 211 along the length direction, and the flushing nozzles 222 are connected with the water source through the pipeline.

[0038] The flushing nozzles 222 are arranged on the top of the material distribution tank 211, which can spray water to clean the inner wall of the material distribution tank 211 and the auger 214, without manual cleaning, reducing the working intensity of the workers and improving the durability of the device.

[0039] As shown in Figure 5 , further, the purification unit 3 comprises an anaerobic tank 31, an anoxic tank 32, an aerobic tank 33 and a sedimentation tank 34 connected in sequence. The sedimentation tank 34 is communicated with a disinfection tank 35 through a clean water pump 341, and the disinfection tank 35 is communicated with the clean water tank 4.

[0040] The wastewater enters the anaerobic tank 31, the anoxic tank 32 and the aerobic tank 33, and is fully contacted with the nitrifying bacteria and the activated sludge in the three tanks to perform biochemical degradation reaction. The degraded wastewater enters the sedimentation tank 34 to perform solid-liquid separation (at this time, the solid-liquid separation object is sludge and degraded wastewater). The clear water in the sedimentation tank 34 is sent to the disinfection tank 35 by the clear water pump 341 to perform disinfection, and is sent to the clean water tank 4 for storage after disinfection.

[0041] As shown in Figure 5 Further, the sedimentation tank 34 is also connected with the flushing nozzle 222 through the clear water pump 341, and is connected with the sludge tank 36 and the anaerobic tank 31 through the sludge pump 342. Further, the sludge tank 36 is also connected with the plate-and-frame filter press 37, and the filtrate outlet of the plate-and-frame filter press 37 is connected to the disinfection tank 35.

[0042] When the distribution chute 211 and the auger 214 need to be cleaned, the external water source is not used, but the flushing nozzle 222 is supplied with water from the sedimentation tank 34 through the clear water pump 341 to perform cleaning, thereby improving the resource utilization efficiency and reducing the cost.

[0043] The sludge at the bottom of the sedimentation tank 34 is transported by the sludge pump 342. Part of the sludge is sent to the sludge tank 36, and then is sent to the plate-and-frame filter press 37 through the sludge tank 36 to perform dewatering treatment and collection. Since the water in the sedimentation tank 34 has been subjected to biochemical degradation, the filtrate obtained by the plate-and-frame filter press 37 is directly sent to the disinfection tank 35 for disinfection treatment. The other part of the sludge is sent back to the anaerobic tank 31 by the sludge pump 342 to supplement the sludge in the anaerobic tank 31, so as to ensure that there is sufficient nitrifying bacteria in the anaerobic tank 31 and the subsequent two tanks, and maintain stable sludge concentration.

[0044] The complete working process of the wastewater treatment system is as follows:

[0045] The wastewater from the wastewater pipe network enters the collection tank 1 for unified collection, and then enters the pretreatment unit 2 for pretreatment. During pretreatment, the solid waste in the wastewater is first filtered through the separation tank 21: the wastewater enters the distribution chute 211 through the feed port 213, the solid waste in the distribution chute 211 is transported forward along the distribution chute 211 under the transportation of the auger 214, and the wastewater flows downward into the liquid collection tank 212 through the filter plate 210. The solid waste is sent to the solid residue transportation device 216 by the auger 214. The solid residue transportation device 216 adopts a screw conveyor, and a plurality of filter holes 219 are uniformly arranged at the bottom of the screw conveyor along the material flow direction. In the process of transporting the solid waste to the waste residue tank 217, the wastewater flows out from the filter holes 219 and enters the liquid collection tank 212 through the pipeline.

[0046] The waste water in the sump 212 is discharged through the drain 218 with the aid of the slope 220 and enters the adjusting tank 22. The waste water will be adjusted in the adjusting tank 22 to meet the requirements of subsequent purification.

[0047] After the pH value is adjusted, the waste liquid enters the purification unit 3 from the adjusting tank 22 to start purification. During purification, the waste water sequentially passes through the anaerobic tank 31, the anoxic tank 32 and the aerobic tank 33, and fully contacts with the nitrifying bacteria and activated sludge in the three tanks to perform biochemical degradation reaction. The waste water after degradation enters the sedimentation tank 34 to perform solid-liquid separation (at this time, the objects of solid-liquid separation are sludge and degraded waste water). The sludge at the bottom of the sedimentation tank 34 is transported by the sludge pump 342. Part of the sludge is sent to the sludge tank 36 and then to the plate-and-frame filter press 37 through the sludge tank 36 to perform dewatering treatment on the sludge and collect the sludge. Another part of the sludge is sent back to the anaerobic tank 31 by the sludge pump 342 to supplement the sludge in the anaerobic tank 31 and maintain stable sludge concentration. The clear water (supernatant) in the sedimentation tank 34 is sent to the disinfection tank 35 by the clear water pump 341 to perform disinfection, and then is sent to the clean water tank 4 for storage after disinfection is completed.

[0048] When it is necessary to clean the distribution tank 211 and the auger 214, an external water source can not be used, but water can be supplied to the flushing nozzle 222 from the sedimentation tank 34 by the clear water pump 341 to perform cleaning.

[0049] It should be noted that the configuration (such as activated sludge, aeration, etc.) of the anaerobic tank 31, the anoxic tank 32 and the aerobic tank 33 is well known to those skilled in the art, and will not be described here.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. The modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wastewater treatment system, characterized by, The sewage collecting tank (1) is communicated with a pretreatment unit (2), the pretreatment unit (2) comprises a separation tank (21) and an adjusting tank (22), and the adjusting tank (22) is sequentially connected with a purification unit (3) and a clean water tank (4) in sequence; The separation tank (21) is divided into an upper distribution chute (211) and a lower liquid collecting tank (212) by a filter plate (210), the top of the distribution chute (211) is provided with a feeding port (213) communicated with the sewage collecting tank (1), a screw conveyor (214) is arranged in the distribution chute (211), the screw conveyor (214) is driven by a motor (215) on the outer wall of the distribution chute (211), one end of the distribution chute (211) away from the feeding port (213) is also communicated with a solid residue conveying device (216), and the tail end of the solid residue conveying device (216) is connected to a waste residue tank (217); and the bottom of the side wall of the liquid collecting tank (212) is provided with a liquid discharge port (218) communicated with the adjusting tank (22).

2. The wastewater treatment system of claim 1, wherein, The solid residue conveying device (216) is a spiral conveyor, and a plurality of filter holes (219) are uniformly arranged on the bottom of the spiral conveyor along the material flow direction, and the filter holes (219) are communicated with the liquid collecting tank (212).

3. The wastewater treatment system of claim 1, wherein, The bottom of the liquid collecting tank (212) is provided with a slope (220), one end of the slope (220) close to the liquid discharge port (218) is a bottom end, and the other end of the slope (220) away from the liquid discharge port (218) is a high end.

4. The wastewater treatment system of claim 1, wherein, The screw conveyor (214) is also provided with a baffle (221) at positions close to the end surface of the distribution chute (211) at both ends.

5. The wastewater treatment system of claim 1, wherein, A plurality of flushing nozzles (222) are uniformly arranged on the top of the distribution chute (211) along the length direction, and the flushing nozzles (222) are connected with a water source through pipelines.

6. The wastewater treatment system of claim 5, wherein, The purification unit (3) comprises an anaerobic tank (31), an anoxic tank (32), an aerobic tank (33) and a sedimentation tank (34) connected in sequence; The sedimentation tank (34) is communicated with a disinfection tank (35) through a clean water pump (341), and the disinfection tank (35) is communicated with the clean water tank (4).

7. The wastewater treatment system of claim 6, wherein, The sedimentation tank (34) is also communicated with the flushing nozzles (222) through the clean water pump (341) and communicated with a sludge tank (36) and the anaerobic tank (31) through a sludge pump (342).

8. The wastewater treatment system of claim 7, wherein, The sludge tank (36) is further connected with a plate-and-frame filter press (37), and the filtrate outlet of the plate-and-frame filter press (37) is connected to the disinfection tank (35).

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