CN205035217U - A treatment system for treating urban sewage up to standard surface water of four types - Google Patents

Abstract

The utility model discloses a treatment system for treating town sewage into standard surface water, which comprises a grid tank, an aeration grit chamber, an AAO biochemical tank, a peripheral rectangular secondary sedimentation tank, a biological contact oxidation tank, a high-density sedimentation tank, a D-shaped filter tank and an ultraviolet disinfection tank which are connected in sequence along the process; through the careful and reasonable design and the mutual combination of the units, the effluent quality of the surface water IV discharge standard can be realized, the process stability is good, the effluent quality is well guaranteed, meanwhile, in the sewage treatment process, the dosage is less, the produced sludge is less, the operation and maintenance cost of a sewage treatment system is lower, the requirement of the era of energy conservation and consumption reduction is met, the optimal unification of environmental benefit and economic benefit is well realized, and the device is suitable for being popularized and applied to sewage treatment projects with similar water quality requirements.

Description

A treatment system for treating urban sewage up to standard surface water of four types

technical field

The utility model relates to the technology in the field of sewage treatment, in particular to a treatment system for treating urban sewage up to the standard four types of surface water.

Background technique

According to the environmental functions and protection objectives of surface waters, my country's surface water is divided into five categories according to the level of function: I, II, III, IV, and V; now many urban sewage discharge standards are set at the discharge standard of surface water category IV, that is, the main It is suitable for general industrial water areas and recreational water areas where the human body is not in direct contact with.

Urban sewage is mainly urban domestic sewage and some industrial wastewater. At present, physical, biological, and chemical methods are mainly used to treat industrial wastewater and domestic sewage to separate solid pollutants in water and reduce organic pollutants and eutrophication in water. substances (mainly nitrogen and phosphorus compounds), thereby reducing the pollution of sewage to the environment. Conventional activated sludge process can meet the removal rate of CODcr, BOD5, SS, but the removal rate of nitrogen and phosphorus is limited. Only nitrogen and phosphorus are removed from the residual sludge of conventional activated sludge process, which removes total nitrogen About 15-25%, but due to the ammonification of total nitrogen in sewage, the removal efficiency of ammonia nitrogen is very low, and often cannot remove ammonia nitrogen. Total phosphorus is generally removed by about 30-50%, which cannot meet the water quality requirements of the surface water category IV discharge standard. Although some sewage treatment systems can achieve the effluent quality of the aforementioned surface water category IV discharge standards, they have the defects of large fluctuations in water quality and poor process stability, especially the high requirements for TP and ammonia nitrogen. More energy is consumed in the process of sewage treatment, and the cost of sewage treatment is high, which is not conducive to popularization and application.

Therefore, a new technical solution needs to be developed to solve the above problems.

Utility model content

In view of this, the utility model aims at the deficiencies of the existing technology, and its main purpose is to provide a treatment system for treating urban sewage up to the standard of four types of surface water. The process stability is good, and the quality of the effluent is well guaranteed. At the same time, the operation and maintenance costs of its sewage treatment system are low, which meets the requirements of the era of energy saving and consumption reduction, and achieves the best unification of environmental benefits and economic benefits.

In order to achieve the above object, the utility model adopts the following technical solutions:

A treatment system for treating urban sewage up to the standard surface water of four types, including grid tanks, aerated grit chambers, AAO biochemical tanks, rectangular secondary settling tanks entering and leaving around, and biological contact oxidation tanks sequentially connected along the technological process , High-density sedimentation tank, D-type filter and ultraviolet disinfection tank.

As a preferred solution, the water inlet of the grid pool is connected to the main sewage inlet pipe, and a drum type grid cleaning machine is arranged in the grid pool, and the drum type grid cleaning machine includes a drum 1. A collecting bucket, a spiral screening conveyor and a screening box, the collecting bucket is located in the drum, and the spiral screening conveyor is connected between the outlet of the drum type grid cleaning machine and the screening box;

The water inlet end of the aeration grit chamber is connected to the water outlet end of the aforementioned grid tank, and the aeration grit chamber is equipped with a Roots blower, an aeration pipe, a bridge sand suction machine, a sand suction pump, and a sand-water separation unit. device and drainage pump; the aerated grit chamber has a first-stage sewage pipe and a second-stage sewage pipe. The slag discharge end of the device is connected to the screen slag box; and, the aeration grit chamber is connected with an overrunning pipe;

The AAO biochemical pool includes an anaerobic pool, a first anoxic pool, a second anoxic pool and an aerobic pool; the AAO biochemical pool is connected with an air suspension centrifugal blower; the aerobic pool is provided with a microporous aerator ; The first-stage sewage pipe of the aforementioned aeration grit chamber is connected to the water inlet of the anaerobic tank, and the water outlet of the anaerobic tank is connected to the water inlet of the first anoxic tank, and the water outlet of the first anoxic tank is connected to the second The water inlet of the anoxic pool and the water outlet of the second anoxic pool are connected to the water inlet of the aerobic pool; An internal reflux pump is set between the oxygen tanks, and a submersible thruster is set in the second anoxic pool to form the reflux in the second anoxic pool and the reflux between the second anoxic pool and the aerobic pool; the first anoxic pool and the anaerobic pool Internal reflux pumps are installed between the pools, and submersible thrusters are also installed in the first anoxic pool and the anaerobic pool to form the respective internal reflux of the first anoxic pool and the anaerobic pool and the reflux between the two;

The water inlet end of the rectangular secondary settling tank entering and leaving the circle is connected to the water outlet end of the aforementioned aerobic tank. Frame and sludge discharge pipe, the sludge discharge pipe is designed as the first sludge return end and the first excess sludge discharge end; the first sludge return end is connected to the aforementioned AAO biochemical tank through the first sludge return pump The first anoxic tank or anaerobic tank;

The water inlet end of the biological contact oxidation tank is connected to the water outlet end of the aforementioned rectangular secondary settling tank, which is provided with filler, membrane microporous aeration head and Roots blower; and, the The water inlet end of the biological contact oxidation tank is provided with water inlet and distribution holes.

As a preferred solution, the anaerobic pool, the first anoxic pool, and the second anoxic pool of the AAO biochemical pool all have a rectangular structure, and vertical partitions are arranged in the corresponding pools along the long side. The partition wall separates the corresponding pool to form left and right flow channels, and the two ends of the vertical partition are kept at a distance from the inner wall of the corresponding pool. in the right channel;

The anaerobic pool and the first anoxic pool are adjacent to each other and have a common wall. The common walls of the anaerobic pool and the first anoxic pool are provided with first and second through holes arranged at left and right intervals. The first and second through-holes are set through the front and back, and the first and second through-holes are respectively opened to the aforementioned left and right flow channels; the annular return channels of the aforementioned anaerobic pool and the first anoxic pool are all counterclockwise In the annular return channel of return flow, the submersible flowmaker in the left channel is set to push backward, and the submersible flowmaker in the right channel is set to push forward;

The annular return channel of the second anoxic pool is a clockwise return annular return channel, and the submerged pusher in the left channel is arranged to push forward, and the submersible flower in the right channel pushes backward The second anoxic pool is located on the left side of the anaerobic pool and the first anoxic pool, and the second anoxic pool has a common wall with the anaerobic pool and the first anoxic pool respectively; the second anoxic pool On the common wall with the first anoxic pool, there is a fourth through hole through left and right, and the fourth through hole is facing the distance between the rear end of the vertical partition in the first anoxic pool;

The aerobic pool includes a front-end horizontal pool, a middle vertical pool, and a rear-end horizontal pool that are sequentially connected. The aerobic pool is located on the left side of the second anoxic pool; the front end of the second anoxic pool and the front-end horizontal pool have a common wall. , the common wall is provided with a fourth through hole through the front and back, and the fourth through hole is set up against the right flow channel of the second anoxic pool; the rear end of the second anoxic pool and the rear lateral pool have a A common wall, the common wall is provided with a fifth through hole that runs through front and back, and the fifth through hole is set up against the left flow channel of the second anoxic pool; the left side of the second anoxic pool and the middle longitudinal pool have a common wall;

And, the aforementioned internal return pump is respectively arranged at the aforementioned second through hole and the fifth through hole.

As a preferred solution, the high-density sedimentation tank includes a mixing zone, a flocculation zone, and a clarification zone connected in sequence; the mixing zone is arranged in the middle, and the two sides of the mixing zone are respectively provided with a flocculation zone and a clarification zone in sequence; The water inlet end of the mixing zone is connected to the water outlet end of the aforementioned biological contact oxidation tank. The mixing zone is equipped with a mixing mixer, the flocculation zone is equipped with a flocculation mixer, and the clarification zone is equipped with a sump, counter-current inclined pipe or inclined plate, and vertical hydraulic pressure. Distributing plate, sludge scraper, sludge thickener, sludge screw pump and ultrasonic mud level control switch for controlling sludge screw pump. The sludge discharge end, the sludge return end is connected to the water inlet end of the mixing zone through the second sludge return pump;

The ultraviolet sterilizing pool is provided with a sun panel awning, a rectifying grid plate, an electric channel gate, an electric hoist, an ultraviolet sterilizing module, and a water level control valve; Sodium hypochlorite storage tank, dosing metering pump, the contact pool is provided with a return water output end and a water outlet end, the return water output end is connected to a return water pump, and the water outlet end is connected to a water outlet adjustment pool.

As a preferred solution, it also includes a thickening tower and a sludge dewatering machine room. The first excess sludge discharge end of the aforementioned rectangular secondary settling tank and the second excess sludge discharge end of the high-density settling tank are collected through pipelines Connected to the concentration tower; the sludge dewatering machine room is equipped with a modification tank, a sludge storage tank, and a plate-and-frame filter press, and the aforementioned concentration tower, modification tank, and sludge storage tank are connected in sequence.

As a preferred solution, a deodorization system is also provided. The aforementioned grid pool, aerated grit chamber, AAO biochemical pool, and rectangular secondary settling tanks in and out of the circle are respectively connected to the deodorization system; the deodorization system includes glass fiber reinforced plastic Centrifugal fan, spray water pump, circulating water pump.

As a preferred solution, the D-type filter is equipped with an air flushing system, a water flushing system and an air-water linkage backwashing system.

A process for treating urban sewage up to the standard surface water category four, including the following process steps

(1) Municipal incoming water is intercepted by coarse grids to remove larger floating and suspended solids in sewage;

(2) Use the drum type grid cleaning machine to further perform slag cutting, slag removal, screw lifting and pressing dehydration on the filtered water obtained in step (1);

(3) Use the aeration grit chamber to remove sand from the filtered water obtained in step (1). Larger particles sink and are discharged with the second-stage sewage pipe; the first-stage sewage pipe is used as the water outlet of the aeration grit chamber, and the water outlet of the second-stage sewage pipe is treated by the sand-water separator, and the liquid outlet of the sand-water separator is refluxed Connect to the grid pool and participate in step (2) again, and the slag discharge end of the sand-water separator will collect the filter residue into the grid slag box;

(4) The sewage discharged from the sewage pipes of the first stage of the aerated grit chamber enters the AAO biochemical tank, and the biological dephosphorization and dephosphorization of the sewage pipes of the first stage are realized by the alternating cycle of anaerobic, anoxic and aerobic three different parts Nitrogen treatment; it divides the anoxic part into two to form the first anoxic pool and the second anoxic pool, the first anoxic pool and the anaerobic part form independent internal reflux, and the aerobic part and the second anoxic pool Another independent internal reflux is formed, and the anaerobic part, the first anoxic tank, the second anoxic tank and the aerobic part are each internally designed as a surrounding reflux type, and the aforesaid aerobic part is controlled by dosing on demand Methanol supplements nutrients to improve nitrogen removal;

(5) The sewage at the outlet of the aerobic part enters the rectangular secondary settling tank that enters and exits around the perimeter to realize solid-liquid separation; part of the separated sludge is returned to the first anoxic pool or anaerobic pool of the aforementioned AAO biochemical pool, while the other part is Discharge as residual sludge;

(6) The sewage obtained from the separation of the rectangular secondary settling tank in and out of the circle is introduced into the biological contact oxidation tank, and the biofilm method is used to strengthen the oxidation and decomposition of ammonia nitrogen to purify the sewage;

(7) The sewage discharged from the aforementioned biological contact oxidation tank is introduced into the high-density sedimentation tank, and the raw water is stirred and mixed with the flocculant by the mixing mixer in the mixing zone. The mixer coagulates and pushes the flow at a slow speed so that the sewage enters the clarification zone at a slow speed, and the suspended particles are evenly deposited. The clarification zone is divided into the upper clear water zone, the middle sludge circulation zone, and the lower sludge concentration zone. The middle sludge circulation zone is controlled by ultrasonic waves. The sludge level control switch accurately controls the operation of the sludge screw pump to ensure the thickness of the lower sludge concentration zone; the clear water in the clarification zone is discharged from its outlet, and the concentrated sludge is discharged as residual sludge;

(8) The water produced in the above step (7) enters the D-type filter, and the comet-type fiber filter material is used for micro-flocculation filtration, and the aforementioned high-density sedimentation tank is combined with the D-type filter to remove phosphorus;

(9) The water produced in the above step (8) enters the ultraviolet disinfection tank for disinfection, and the produced water reaches the standard for discharge or reuse.

As a preferred solution, a contact disinfection step is further added after the step (9), adding sodium hypochlorite into the contact tank, and the product water obtained in the aforementioned step (9) is sterilized by the contact tank before being reused or discharged.

As a preferred solution, the residual sludge discharged from the rectangular secondary settling tank and high-density settling tank that enters and exits weekly is dehydrated after being acted on by a thickening tower, a modified tank, a mud storage tank, and a plate-and-frame filter press. Drying treatment.

Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above-mentioned technical scheme that it is mainly through the grid tank, the aerated grit chamber, the AAO biochemical tank, the weekly input and the weekly output rectangular The careful and reasonable design and combination of each unit of the secondary sedimentation tank, biological contact oxidation tank, high-density sedimentation tank, D-type filter tank and ultraviolet disinfection tank can achieve the discharge water quality of the aforementioned surface water category IV, and the process is stable. It can guarantee the quality of the effluent water well. At the same time, in the process of sewage treatment, the dosage of chemicals is less, less sludge is produced, and the operation and maintenance costs of the sewage treatment system are low, which meets the requirements of the era of energy saving and consumption reduction. Very good It achieves the best unification of environmental benefits and economic benefits, which is suitable for popularization and application in sewage treatment projects with similar water quality requirements.

In order to illustrate the structural features and functions of the utility model more clearly, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the utility model;

Fig. 2 is the structural representation of grid pool, aerated grit chamber in the embodiment of the utility model;

Fig. 3 is the structural diagram of AAO biochemical pool in the embodiment of the present utility model;

Fig. 4 is the structural representation of secondary settling tank, biological contact oxidation tank in the embodiment of the present utility model;

Fig. 5 is the structural representation of high-density settling tank in the embodiment of the present utility model;

Fig. 6 is a cross-sectional structure diagram of a high-density sedimentation tank;

Fig. 7 is the structural diagram (top view) of ultraviolet sterilizing pond and contact pond in the embodiment of the utility model;

Fig. 8 is the structural diagram (looking up) of the ultraviolet sterilizing pool and the contact pool in the embodiment of the utility model;

Fig. 9 is a cross-sectional structure diagram of a high ultraviolet disinfection pool and a contact pool.

Explanation of the accompanying drawings:

10. Grid pool 11. Drum type grid cleaning machine

12. Sewage main inlet pipe 13. Slag box

20. Aerated grit chamber 21. Beyond tube

22. Slag box 23. Bridge sand suction machine

24. Sand-water separator 25. Phase I sewage pipe

26. Phase II sewage pipe 30. AAO biochemical pool

31. Anaerobic pool 32. The first anoxic pool

33. Second anoxic pool 34. Aerobic pool

35. Internal backflow pump 36. Submersible thruster

37. Aeration pipe 38. Blower room

40. Rectangular secondary settling tank entering and exiting weekly 41. Tubular skimmer

42, scum frame 43, mud discharge pipe

50. Biological contact oxidation pool 51. Filler

52. Diaphragm microporous aeration head 53. Water inlet and distribution holes

60. High-density sedimentation tank 61. Mixing area

611, mixing mixer 612, adjustable weir gate

62. Flocculation area 621. Flocculation mixer

63. Clarification area 64. Water collection tank

65. Countercurrent inclined pipe 66. Longitudinal hydraulic distribution plate

67. Sludge thickener 70. D-type filter

80. Ultraviolet disinfection pool 81. Rectification grid plate

82. Electric channel gate 83. Electric hoist

84. Ultraviolet disinfection module 85. Contact pool

86. Water level control valve 87. Sodium hypochlorite storage tank

88. Dosing metering pump 89. Reuse water pump

90. Sludge dewatering machine room 91. Thickening tower

92. Modified tank 93. Mud storage tank

94. Plate and frame filter press.

detailed description

Please refer to shown in Fig. 1 to Fig. 9, it has shown the concrete structure of the embodiment of the present utility model, here, take the AO-BWEM process system that the applicant researches meticulously as example to illustrate; Its sewage treatment system includes along The grid tank 10, aerated grit chamber 20, AAO biochemical tank 30, rectangular secondary settling tank 40 entering and leaving around, biological contact oxidation tank 50, high-density sedimentation tank 60, D-type filter tank 70 and UV disinfection pool 80.

The water inlet end of the grid pool 10 is connected with a sewage main water inlet pipe 12, and the grid pool 10 here is equivalent to a fine grid. Floating and suspended solids to ensure the smooth operation of subsequent treatment facilities; a drum type grid cleaning machine 11 is arranged in the grid pool 10, and the drum type grid cleaning machine includes a drum, a collecting bucket, Spiral screening conveyor and screening box 13, the collection bucket is located in the drum; the screenings intercepted on the grid are sent to the top with the rotation of the drum, then fall into the collection bucket, and pass through the screw screening conveyor. Gradually extruded and transported into the grid slag box 13, therefore, the grid pool 10 has four functions of slag cutting, slag removal, screw lifting, pressing and dehydration as a whole, and it has the advantages of thorough slag removal, high separation efficiency, and compact structure. .

The water inlet end of the aeration grit chamber 20 is connected to the water outlet end of the aforementioned grid pool 10, and the aeration grit chamber 20 is provided with a Roots blower, an aeration pipe, a bridge sand suction machine 23, and a sand suction pump. , sand-water separator 24 and drainage pump; the aerated grit chamber 20 has a first-phase sewage pipe 25 and a second-phase sewage pipe 26; the aerated grit chamber 20 is based on gravity separation, and the suspended particles with less specific gravity With the discharge of the first-stage sewage pipe 25, the particles with larger specific gravity will sink and be discharged with the second-stage sewage pipe 26; the first-stage sewage pipe 25 is used as the water outlet of the aerated grit chamber 20, and the second-stage sewage pipe 26 is discharged through the sand The water separator 24 is processed, and the liquid outlet end of the sand water separator 24 is connected back to the aforementioned grid tank 10, and the slag outlet end of the sand water separator 24 collects the filter residue into the grid slag box 22; and, the aeration grit chamber 20 is connected with an overflow pipe 21. When the water intake of the sewage plant exceeds the load, or cannot operate normally (overhaul), in order to ensure safety, the sewage entering the sewage plant is directly discharged through the excess pipe without treatment.

The AAO biochemical pool 30 includes an anaerobic pool 31, a first anoxic pool 32, a second anoxic pool 33 and an aerobic pool 34; the AAO biochemical pool 30 is connected with an air suspension centrifugal blower (a blower room 38 can be specially set up) ; This aerobic tank 34 is provided with a microporous aerator; the first phase sewage pipe of the aforementioned aerated grit chamber is connected to the water inlet of the anaerobic tank 31, and the water outlet of the anaerobic tank 31 is connected to the first anoxic The water inlet end of pond 32, the water outlet end of the first anoxic pond 32 is connected with the water inlet end of the second anoxic pond 33, and the water outlet end of the second anoxic pond 33 is connected with the water inlet end of aerobic pond 34; 34 back to the water inlet of the second anoxic pool 33, the aerobic pool 34 and the second anoxic pool 33 are provided with an internal return pump 35, and the second anoxic pool 33 is provided with a submersible flowmaker 36, forming the backflow in the second anoxic pool 33 and the backflow between the second anoxic pool 33 and the aerobic pool 34; an internal backflow pump 35 is arranged between the first anoxic pool 32 and the anaerobic pool 31, and the first The anoxic tank 32 and the anaerobic tank 31 are also respectively provided with submersible flowmakers 36 to form the internal backflow of the first anoxic tank 32 and the anaerobic tank 31 and the backflow between them.

In this embodiment, the AAO biochemical pool 30 is provided with the aforementioned two groups of anaerobic pools 31, the first anoxic pool 32, the second anoxic pool 33, and the aerobic pool 34, and the two sets of structures are left and right Symmetrical arrangement, sewage enters the middle, and the entire AAO biochemical pool 30 has a rectangular structure outside; the anaerobic pool 31, the first anoxic pool 32, and the second anoxic pool 33 are all rectangular structures, and the four corners of the interior are all designed It is a round-guiding transition structure, so as to facilitate the smooth return flow and reduce the dead angle of deposition. There are vertical partitions extending along the long side in the corresponding pools. The vertical partitions separate the corresponding pools to form left and right flow channels, and vertical The two ends of the partition are kept at a distance from the inner wall of the corresponding pool (as a preferred design, the width of the distance is equal to the width of the left and right flow channels respectively), and the aforementioned left and right flow channels are connected to form an annular return flow channel through the spacing between the two ends. The submersible thrusters are respectively arranged in the right flow channel.

The aforementioned anaerobic pool 31 and the first anoxic pool 32 are adjacent to each other and have a common wall. On the common wall of the anaerobic pool 31 and the first anoxic pool 32, there are first and second channels arranged at left and right intervals. hole, the first and second through-holes are set through the front and back, and the first and second through-holes are respectively opened to the aforementioned left and right flow channels; the annular return channels of the aforementioned anaerobic pool 31 and the first anoxic pool 32 They are all ring-shaped return passages that flow back in the counterclockwise direction. The submersible flowmakers in the left flow channel are set in a backward push flow type, and the submersible flow boosters in the right flow channel are set in a forward push flow type.

The annular return passage of this second anoxic pool 33 is the annular return passage of clockwise direction backflow, and the submerged flow pusher in the left flow channel pushes forward and the submerged flow pusher in the right flow passage pushes backward Flow type setting; the second anoxic pool 33 is located on the left side of the anaerobic pool 31 and the first anoxic pool 32, and the second anoxic pool 33 and the anaerobic pool 31 and the first anoxic pool 32 have a common Wall; the common wall of the second anoxic pool 33 and the first anoxic pool 32 is provided with a left and right through fourth through hole, and the fourth through hole is facing the spacing of the rear end of the vertical partition wall in the first anoxic pool 32 .

The aerobic pool 34 includes a front-end horizontal pool, a middle longitudinal pool, and a rear-end horizontal pool that are sequentially connected. The middle longitudinal pool is separated from a plurality of flow diversion walls that extend left and right and are spaced from each other. The flow diversion walls are respectively Alternately extending from the left and right inner side walls of the middle longitudinal pool, the left-right width of the diversion partition wall is smaller than the left-right width of the middle longitudinal pool, and two adjacent diversion partition walls have overlapping parts, so that the flow direction in the aerobic pool is Multi-section S-shaped detour, generally shown in the direction of the arrow in Figure 3; the aerobic pool 34 is located on the left side of the second anoxic pool 33; the front end of the second anoxic pool 33 and the front end transverse pool have a common wall, The wall is provided with a fourth through hole that runs through front and back, and the fourth through hole is set up against the right flow channel of the second anoxic pool 33; the rear end of the second anoxic pool 33 and the rear end horizontal pool have a common wall, the common wall is provided with the fifth through hole through the front and back, and the fifth through hole is set up against the left flow channel of the second anoxic pool; the left side of the second anoxic pool 33 and the middle longitudinal pool have A common wall; and, the aforementioned internal return pump 35 is respectively arranged at the aforementioned second through hole and the fifth through hole.

The design of the AAO biochemical pool 30 has many advantages, for example: ① EMUCT can adjust the proportion of influent water allocated to the anaerobic section and the anoxic section, so as to provide the optimal carbon source for simultaneous biological denitrification and phosphorus removal; ② EMUCT can The ratio of water to carbon and nitrogen converts one or two anoxic units into aerobic units, and satisfactory results can be obtained even in winter; ③The sludge return adopts two-stage return, and the returned sludge is in the first anoxic unit Dissolved oxygen and nitrate nitrogen are consumed, which makes the nitrate oxygen in the sludge returned to the anaerobic section zero, ensuring the anaerobic state of the anaerobic tank, thereby reducing the volume of the anaerobic tank and improving biological phosphorus removal Effect; ④ According to the actual water quality, the activated sludge can also be directly returned to the anaerobic section to make EMUCT run in A/A/O mode. At this time, the first-stage return can be saved and energy consumption can be saved; The amount of nitrate/COD is controlled in real time; ⑥The nitrogen removal effect can be improved by controlling the addition of methanol as needed to supplement nutrients. Through the treatment of AAO biochemical pool, the concentration of CODcr, BOD5, SS, TN, NH3-N, TP and other pollutants can be greatly reduced.

The water inlet end of the rectangular secondary settling tank 40 entering and leaving the circle is connected to the water outlet end of the aforementioned aerobic tank 34, and the rectangular secondary settling tank 40 entering and leaving the circle is provided with a siphon bridge type mud scraper and a tubular skimmer 41. , scum frame 42 and sludge discharge pipe 43, the sludge discharge pipe 43 is designed as the first sludge return end and the first residual sludge discharge end; the first sludge return end is connected to the return flow through the first sludge return pump To the first anoxic pool or anaerobic pool of the aforementioned AAO biochemical pool. The rectangular secondary settling tank 40 with weekly inlet and weekly outlet is designed based on shallow pond theory, with even water distribution, strong adaptability to impact load and temperature changes, stable sedimentation effect, and small head loss (generally around 0.3-0.4m) , low cost of sludge lifting, convenient construction, and small footprint.

The water inlet end of this biological contact oxidation tank 50 is connected to the water outlet end of the rectangular secondary settling tank 40 that goes in and out of the aforementioned circle, and it utilizes the biofilm method to strengthen the oxidation and decomposition of ammonia nitrogen to purify the sewage; the biological contact oxidation tank 50 is provided with Filler 51, diaphragm type microporous aeration head 52 and Roots blower; and, the water inlet end of this biological contact oxidation tank 50 is provided with water inlet and distribution hole 53; The combined process completed by the rectangular secondary sedimentation tank 40 and the biological contact oxidation tank 50 fully exerts the phosphorus and nitrogen removal functions of microorganisms, mainly uses biological phosphorus removal, reduces the dosage of chemicals, and reduces operating costs.

The high-density sedimentation tank 60 includes a mixing zone 61, a flocculation zone 62, and a clarification zone 63 that are connected in sequence; , wherein, an adjustable weir gate 612 is provided between the mixing zone 61 and the flocculation zone 62; the water inlet end of the mixing zone 61 is connected to the water outlet end of the aforementioned biological contact oxidation tank 50, and the mixing zone 61 is provided with a mixing mixer 611, The flocculation area 62 is equipped with a flocculation mixer 621, and the clarification area 63 is equipped with a sump 64, a counter-flow inclined pipe 65 or an inclined plate, a longitudinal hydraulic distribution plate 66, a mud scraper, a sludge thickener 67, a sludge screw pump and To control the ultrasonic mud level control switch of the sludge screw pump, the clarification area 63 is provided with a water outlet, a second sludge return end and a second excess sludge discharge end, and the sludge return end is connected to the second sludge return pump Return to the water inlet end of the mixing zone 61.

The D-type filter 70 is a deep bed filter, and the comet-type fiber filter material is used for filtration; the comet-type fiber filter material has a high density and small volume, and the comet tail of the filter material is a fiber tow with a low density. Due to the structural characteristics of the comet fiber filter material, the filter layer has gaps from large to small in the direction of water flow, forming an inverted pyramid structure, which has the characteristics of large dirt holding capacity and high filtration accuracy. The D-type filter tank 70 has the advantages of large specific surface area and low filtration resistance. The tiny diameter of the filter material greatly increases the specific surface area and surface free energy of the filter material, increases the contact opportunities of impurities and particles in the water with the filter material and the adsorption capacity of the filter material, thereby improving the filtration efficiency, and, Its filtration precision is high, and it has a certain removal effect on impurities such as macromolecular organic matter, viruses, bacteria, and colloids; its interception capacity is large, generally 15-25kg/m3; Parameters such as filtration resistance can be adjusted according to needs; the filtration speed is high, up to 30m/h, and the floor area is small, accounting for only 1/3~1/2 of the traditional filter; the self-consumption is low, only 100% of the periodic water production. 1% to 2%; in particular, the D-type filter 70 is equipped with an air flushing system, a water flushing system, and an air-water linkage backwashing system to ensure its filtration capacity; the aforementioned high-density sedimentation 60 and the D-type filter The setting of 70 further strengthens the phosphorus removal effect.

The ultraviolet sterilizing pool 80 is provided with a sun panel canopy, a rectifying grid plate 81, an electric channel gate 82, an electric hoist 83, an ultraviolet sterilizing module 84, and a water level control valve 86; the water outlet of the ultraviolet sterilizing pool 80 is further provided with a contact pool 85, the contact tank 5 is provided with a sodium hypochlorite storage tank 87 and a dosing metering pump 88, the contact tank 85 is provided with a reuse water output end and a water outlet, the reuse water output end is connected to a reuse water pump 89, and the water outlet is connected to There is a water regulating pool.

The surplus sludge discharged from the rectangular secondary settling tank 40 and the high-density settling tank 60 that enters and exits the circle can be discharged to a place where the concentrated sludge can be received, and can also be dried; here, by designing the thickening tower 91. The sludge dewatering machine room 90 realizes the dehydration and drying of excess sludge, specifically: the sludge dewatering machine room 90 is equipped with a modified tank 92, a mud storage tank 93, and a plate and frame filter press 94; the aforementioned Zhou Jin Zhou The first excess sludge discharge end of the rectangular secondary settling tank 40 and the second excess sludge discharge end of the high-density settling tank 60 are connected to the concentration tower 91 through pipelines. The aforementioned concentration tower 91, modification tank 92, and sludge storage tank 93 are connected in sequence; the above-mentioned excess sludge is dehydrated and dried after being acted on by the thickening tower 91, the modification tank 92, the mud storage tank 93, and the plate-and-frame filter press 94.

Utilize the aforementioned sewage treatment system to carry out the sewage treatment process, including the following process steps

(1) Municipal incoming water is intercepted by coarse grids to remove larger floating and suspended solids in sewage;

(2) Use the drum type grid cleaning machine to further perform slag cutting, slag removal, screw lifting and pressing dehydration on the filtered water obtained in step (1);

(3) Use the aeration grit chamber to remove sand from the filtered water obtained in step (1). Larger particles sink and are discharged with the second-stage sewage pipe; the first-stage sewage pipe is used as the water outlet of the aeration grit chamber, and the water outlet of the second-stage sewage pipe is treated by the sand-water separator, and the liquid outlet of the sand-water separator is refluxed Connect to the grid pool and participate in step (2) again, and the slag discharge end of the sand-water separator will collect the filter residue into the grid slag box;

(4) The sewage discharged from the sewage pipes of the first stage of the aerated grit chamber enters the AAO biochemical tank, and the biological dephosphorization and dephosphorization of the sewage pipes of the first stage are realized by the alternating cycle of anaerobic, anoxic and aerobic three different parts Nitrogen treatment; it divides the anoxic part into two to form the first anoxic pool and the second anoxic pool, the first anoxic pool and the anaerobic part form independent internal reflux, and the aerobic part and the second anoxic pool Another independent internal reflux is formed, and the anaerobic part, the first anoxic tank, the second anoxic tank and the aerobic part are each internally designed as a surround-reflux type;

(5) The sewage at the outlet of the aerobic part enters the rectangular secondary settling tank that enters and exits around the perimeter to realize solid-liquid separation; part of the separated sludge is returned to the first anoxic pool or anaerobic pool of the aforementioned AAO biochemical pool, while the other part is Discharge as residual sludge;

(6) The sewage obtained from the separation of the rectangular secondary settling tank in and out of the circle is introduced into the biological contact oxidation tank, and the biofilm method is used to strengthen the oxidation and decomposition of ammonia nitrogen to purify the sewage;

(7) The sewage discharged from the aforementioned biological contact oxidation tank is introduced into the high-density sedimentation tank, and the raw water is stirred and mixed with the flocculant by the mixing mixer in the mixing zone. The mixer coagulates and pushes the flow at a slow speed so that the sewage enters the clarification zone at a slow speed, and the suspended particles are evenly deposited. The clarification zone is divided into the upper clear water zone, the middle sludge circulation zone, and the lower sludge concentration zone. The middle sludge circulation zone is controlled by ultrasonic waves. The sludge level control switch accurately controls the operation of the sludge screw pump to ensure the thickness of the lower sludge concentration zone; the clear water in the clarification zone is discharged from its outlet, and the concentrated sludge is discharged as residual sludge;

(8) The water produced in the above step (7) enters the D-type filter tank, and uses comet-type fiber filter material for micro-flocculation filtration;

(9) The water produced in the above step (8) enters the ultraviolet disinfection tank for disinfection, and the produced water reaches the standard for discharge or reuse;

(10) A contact disinfection step is further added after the step (9). Sodium hypochlorite is added into the contact tank, and the product water obtained in the aforementioned step (9) is disinfected by the contact tank before being reused or discharged.

According to the process technology route, the analysis of the removal rate of the pollution factors by the above-mentioned main treatment units is roughly shown in the following table (it is the analysis table of the removal rate of a typical urban domestic sewage):

The above-mentioned sewage treatment system is also equipped with a deodorization system, methanol dosing system, water collection tank, electric control system, etc.; of course, it can also be equipped with a corresponding noise reduction system, etc.; The rectangular secondary settling tanks in and out of the week are respectively connected to the deodorization system; the deodorization system includes a fiberglass centrifugal fan, spray water pump, circulating water pump, etc.

Here, we need to introduce the electronic control system in particular:

The electronic control system includes instruments and meters, various power supplies and an automatic control system for controlling the aforementioned modules. The main functions of the automatic control system include: (1) collection of various main process parameters in the production process; (2) various Measurement and accumulation of energy consumption, material consumption, and incoming and outgoing water flow; (3) Monitoring of working conditions and process conditions of production process equipment; (4) Automatic control of production process equipment; (5) Realization of the sequence of process electronic control equipment , conditions, timing, counting control, PID adjustment and other control functions and data processing functions; (6) Free switching between computer control and traditional electrical control; (7) Data storage and historical retrospective of production parameters; (8) Data regression analysis and trend Analysis; (9) Automatic formation and printing of production reports; (10) Accident alarm and accident record printing, etc.

The aforementioned automatic control system includes a central control room and several PLC field control stations. The central control room has a central monitoring industrial computer, a laser printer, a dot matrix printer, a projector, an uninterruptible power supply (UPS), a switching power supply, an operation desk, and a fiber optic switch (management type); the central monitoring computer is connected with industrial Ethernet, equipped with real-time monitoring system software, to realize real-time monitoring of production site equipment status, remote control, production process data storage and analysis, report printing and alarm and other functions; the central control room computer through Network remote control of on-site main process equipment or unit on, off, stop and operating parameter setting, monitoring operating conditions and operating parameters; the projector can dynamically display the process flow chart of the whole plant, various instrument parameters, and the operation of each main process equipment status or fault status, and can timely, intuitively and comprehensively understand the operation status of each equipment and instrument in the whole plant.

In this embodiment, there are altogether 6 PLC field control stations, namely the first PLC field control station, the second PLC field control station, the third PLC field control station, the fourth PLC field control station, and the fifth PLC field control station. station and the sixth PLC on-site control station; each PLC on-site control station mainly includes PLC, on-site HMI, communication device, isolation device, UPS and overvoltage protection device, etc., and about 20% of the I/O points of each PLC are reserved If there is a surplus, when new technological structures are added, they will be reset and directly connected to the near-term optical fiber ring network.

The first PLC on-site control station is set in the substation and distribution room, responsible for grid pool, aerated grit chamber, AAO biochemical pool, rectangular secondary settling pool entering and exiting around, biological contact oxidation pool, high-density sedimentation pool, blower The equipment status and process parameters of the room and water outlet area are detected and controlled, and the instrument data in this area is collected. The power parameters of the electric meters on the low-voltage incoming line cabinet, capacitor compensation cabinet, frequency converter cabinet and soft starter cabinet are transmitted to the first PLC field control station through the Modbus-RTU communication cable, and are uniformly monitored by the central control room.

The second PLC on-site control station is set in the D-type filter tank, responsible for the detection and control of the equipment status and process parameters of the D-type filter tank, and the instrument data collection in this area; the third PLC on-site control station is set up in the sludge dewatering tank. The machine room is supported by the sludge dewatering machine room; the fourth PLC field control station is set in the ultraviolet disinfection pool, which is supported by the ultraviolet disinfection system; the fifth PLC field control station is set in the deodorization room, which is supported by the deodorization system; the sixth The PLC on-site control station is set up in the methanol dosing room, which is supported by the methanol dosing system to control the dosing of methanol according to the needs of the reaction process, supplement nutrients as needed, and improve the nitrogen removal effect; the aforementioned automatic control system is controlled by the site (on-site) Control execution, on-site control station and central control room conduct data communication through industrial Ethernet, and control the main process equipment in the factory adopts three-layer distributed control mode of local control, on-site control and central control; it adopts distributed and Centralized combined control system, this structure can enable centralized management of information in the production process to achieve overall operation, management and optimization. At the same time, it also makes control risks dispersed and improves system reliability. The automatic control system equipment of the whole sewage plant operates relatively independently. When a local failure occurs, it will not affect the normal operation of the control units of other PLC field control stations at the upper, lower or same level, which meets the requirements of centralized management and decentralized control. .

The above are only preferred embodiments of the present utility model, and do not limit the technical scope of the present utility model, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model , all still belong to the scope of the technical solution of the utility model.

Claims (7)

1. by a treatment system for surface water four class up to standard for urban wastewater treatment, it is characterized in that: include the grating tank, aerated grit chamber, AAO biochemistry pool, the Zhou Jinzhou that connect successively along technological process and go out rectangle second pond, biological contact oxidation pond, potassium permanganate composites, D type filter tank and disinfection by ultraviolet light pond.

2. according to claim 1 a kind of by the treatment system of surface water four class up to standard for urban wastewater treatment, it is characterized in that: the feed-water end of described grating tank is connected with sewage water inlet manifold, Barrate type grilling trash remover is provided with in this grating tank, this Barrate type grilling trash remover includes rotary drum, collection bucket, spiral grid slag handling machinery and grid slag case, this collection bucket is positioned at rotary drum, and this spiral grid slag handling machinery is connected between Barrate type grilling trash remover outlet and grid slag case;

The feed-water end of described aerated grit chamber is connected to the water side of aforementioned grating tank, is provided with Root's blower, aeration tube, bridge-type sand sucker, Sand pump, grit water separator and wet-pit in this aerated grit chamber; This aerated grit chamber has first phase waste pipe and the second stage of waste pipe, and the second stage of waste pipe is connected in grit water separator, and the outlet end of grit water separator is communicated in grating tank, and the slag output end of grit water separator is connected to grid slag case; And this aerated grit chamber is connected with and surmounts pipe;

Described AAO biochemistry pool includes anaerobic pond, the first anoxic pond, the second anoxic pond and Aerobic Pond; This AAO biochemistry pool is connected with air suspension centrifugal blower; Pore type aerator is provided with in this Aerobic Pond; The first phase waste pipe of aforementioned aerated grit chamber is connected to the feed-water end of anaerobic pond, the water side of anaerobic pond is communicated with the feed-water end of the first anoxic pond, the water side of the first anoxic pond is communicated with the feed-water end of the second anoxic pond, and the water side of the second anoxic pond is communicated with the feed-water end of Aerobic Pond; The water side of Aerobic Pond is back to the feed-water end of the second anoxic pond, is provided with internal reflux pump between Aerobic Pond and the second anoxic pond, is provided with submersible water impeller in the second anoxic pond, forms the second anoxic pond internal reflux and the backflow between the second anoxic pond and Aerobic Pond; Be provided with internal reflux pump between first anoxic pond and anaerobic pond, in the first anoxic pond and anaerobic pond, be also respectively arranged with submersible water impeller, form internal reflux and the backflow between the two separately of the first anoxic pond, anaerobic pond;

The feed-water end that described Zhou Jinzhou goes out rectangle second pond is connected to the water side of aforementioned Aerobic Pond, Zhou Jinzhou goes out rectangle second pond and is provided with hydrocone type bridge mud scraper, tubular type skimmer, scum silica frost frame and shore pipe, and this shore pipe diversion design is the first sludge reflux end and the first excess sludge outlet end; Its first sludge reflux end connects the first anoxic pond or the anaerobic pond that are back to aforementioned AAO biochemistry pool through the first sludge reflux pump;

The feed-water end of described biological contact oxidation pond is connected to the water side that aforementioned Zhou Jinzhou goes out rectangle second pond, and this biological contact oxidation pond is provided with filler, microporous diaphragm aeration head and Root's blower; And the feed-water end of this biological contact oxidation pond is provided with into water distributing hole.

3. according to claim 2 a kind of by the treatment system of surface water four class up to standard for urban wastewater treatment, it is characterized in that: the anaerobic pond of described AAO biochemistry pool, the first anoxic pond, the second anoxic pond are all rectangle structure, all vertical next door is had along long side direction is extended in its respective cells, this vertical next door will be separated to form left and right side runner in respective cells, and vertical two ends, next door and respective cells inwall keep spacing, aforementioned left and right side runner forms annular return road through go-and-retum apart from being communicated with, and aforementioned submersible water impeller is arranged in the runner of right side respectively;

Before and after described anaerobic pond, the first anoxic pond, neighbour establishes and has a common wall, the common wall of this anaerobic pond, the first anoxic pond offers first and second through hole of left and right pitch arrangement, this first and second through hole is the through setting in front and back all, and this first and second through hole is just offered aforementioned left and right side runner respectively; The annular return road of aforementioned anaerobic pond, the first anoxic pond is the annular return road of counterclockwise backflow, and the submersible water impeller on the left of it in runner backward pulling flow type is arranged, and the submersible water impeller in the runner of right side forward pulling flow type is arranged;

The annular return road of this second anoxic pond is the annular return road of clockwise direction backflow, and the submersible water impeller on the left of it in runner forward pulling flow type is arranged, and the submersible water impeller in the runner of right side backward pulling flow type is arranged; This second anoxic pond is positioned at the left side of anaerobic pond, the first anoxic pond, and the second anoxic pond and anaerobic pond, the first anoxic pond have a common wall respectively; The common wall of the second anoxic pond and the first anoxic pond offers the fourth hole that left and right is through, this fourth hole is just to the spacing of rear end, next door vertical in the first anoxic pond;

This Aerobic Pond includes horizontal pond, front end through successively, the horizontal pond in middle longitudinal pond and rear end, and this Aerobic Pond is positioned on the left of the second anoxic pond; The horizontal pond in the front end of the second anoxic pond and front end has a common wall, fourth hole through before and after this common wall offers, and this fourth hole is just arranged the right side runner of the second anoxic pond; The horizontal pond in the rear end of this second anoxic pond and rear end has a common wall, fifth hole through before and after this common wall offers, and this fifth hole is just arranged the left side runner of the second anoxic pond; The longitudinal pond in the left side of this second anoxic pond and centre has a common wall;

And aforementioned internal reflux pump is arranged at aforementioned second through hole, fifth hole place respectively.

4. according to claim 2 a kind of by the treatment system of surface water four class up to standard for urban wastewater treatment, it is characterized in that: described potassium permanganate composites include connect successively mixing zone, flocculation zone, settling section; Described mixing zone is arranged at centre, and both sides, described mixing zone are disposed with flocculation zone, settling section respectively; The feed-water end of this mixing zone is connected to the water side of aforementioned biological contact-oxidation pool, mixing zone is provided with mixing and blending machine, flocculation zone is provided with flocculation stirring machine, water leg, reverse-flow inclined tube or swash plate, longitudinal waterpower grid distributor, mud scraper, sludge concentrator, mud spiral pump and the ultrasonic wave mud position trip switch for controlling mud spiral pump is provided with in settling section, this settling section is provided with water side, the second sludge reflux end and the second excess sludge outlet end, and this sludge reflux end connects the feed-water end being back to mixing zone through the second sludge reflux pump;

Described disinfection by ultraviolet light pond is provided with sunlight board rain cover, honeycomb screen, electronic channel gate, electric block, uv sterilisation module, water level control slap door; The water side in disinfection by ultraviolet light pond is provided with contact tank further, be provided with clorox storage tank in this contact tank, add volume pump, this contact tank is provided with reuse water output terminal and water side, and this reuse water output terminal is connected with reuse water pump, and this water side is connected with water outlet equalizing tank.

5. according to claim 4 a kind of by the treatment system of surface water four class up to standard for urban wastewater treatment, it is characterized in that: also include upgrading tower, sludge dewatering machine room, aforementioned Zhou Jinzhou goes out the first excess sludge outlet end of rectangle second pond, the second excess sludge outlet end of potassium permanganate composites is connected to upgrading tower through pipe influx; This sludge dewatering machine room is provided with modified tank, storage basin, plate-and-frame filter press, and aforementioned upgrading tower, modified tank, storage basin connect successively.

6. according to claim 1 a kind of by the treatment system of surface water four class up to standard for urban wastewater treatment, it is characterized in that: be also provided with deodoration system, aforementioned grating tank, aerated grit chamber, AAO biochemistry pool, Zhou Jinzhou go out rectangle second pond and are connected to deodoration system respectively; This deodoration system includes glass reinforced plastic centrifugal blower, feeding spraying pump, water circulating pump.

7. according to claim 1 a kind of by the treatment system of surface water four class up to standard for urban wastewater treatment, it is characterized in that: described D type filter tank is configured with gas flushing system, water carriage system and Pneumatic-hydraulic interlocked back-purge system.