CN217103371U - Advanced sewage purification treatment device for farm - Google Patents
Advanced sewage purification treatment device for farm Download PDFInfo
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- CN217103371U CN217103371U CN202220575867.XU CN202220575867U CN217103371U CN 217103371 U CN217103371 U CN 217103371U CN 202220575867 U CN202220575867 U CN 202220575867U CN 217103371 U CN217103371 U CN 217103371U
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Abstract
The utility model discloses a deep purification treatment device for sewage in a farm, which comprises a first reaction tank, a second reaction tank, a third reaction tank and a fourth reaction tank, wherein a time-delay reaction tank is arranged beside the second reaction tank and the third reaction tank, the first reaction tank, the second reaction tank, the time-delay reaction tank, the third reaction tank and the fourth reaction tank are sequentially communicated, the deep purification treatment device also comprises a first medicine feeding barrel, a second medicine feeding barrel, a third medicine feeding barrel and a fourth medicine feeding barrel which are respectively communicated with the first reaction tank, the second reaction tank, the third reaction tank and the fourth reaction tank through a medicine feeding pump, the time-delay reaction tank is provided with a scum skimming device, the deep purification treatment device is more convenient to feed medicine by arranging four independent medicine feeding barrels to respectively feed the four reaction tanks according to the sewage condition and the reaction condition, and a scum skimming device is arranged on the upper side of the time-delay reaction tank, the scum in the culture sewage can be conveniently skimmed, and the scum skimming is more convenient.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a sewage treatment's technical field, especially the technical field of plant's sewage deep purification processing apparatus.
[ background of the invention ]
With the continuous promotion of urbanization and industrialization, the population of towns and industries is continuously increased, the supply pressure of urban meat food is increased, and the development of livestock breeding industry in China towards large-scale and intensification is promoted. A large amount of waste water can be generated in the industrial livestock industry production process, if the waste water is directly discharged without any treatment, the waste water enters farmlands and ditches from the surface of the livestock industry and overflows into the water body environment of a small watershed to cause pollution to ammonia nitrogen and organic matters in the water body nearby, and the pollution of the fecal sewage to the water body and the soil is mainly the harm brought by organic pollutants and nitrogen and phosphorus nutrient substances. After entering the natural water body, the water is turbid, the water color turns yellow, and the smell is foul. Under the action of microorganisms, a large amount of Dissolved Oxygen (DO) in a water body is consumed, when the water body is serious, the dissolved oxygen is exhausted, organic matters are subjected to anaerobic decomposition to generate various malodorous substances, the water body becomes black and smelly, the water quality is deteriorated, the excrement and urine sewage and the polluted water body, feed and air thereof can finally cause the spread and development of infectious diseases and parasitic ova of livestock and poultry, the health of livestock and human is influenced, the continuous and healthy development of the large-scale livestock and poultry raising industry is threatened, and the vicious circle of pollution causes serious harm to the development of the livestock and poultry industry.
Chinese utility model patent with publication number CN211141765U just provides a sewage treatment plant for high altitude aquaculture plant, including the sewage treatment case body that the opening faces upward, the filter component who sets up upper portion in sewage treatment case body inner chamber, set up the ultrasonic wave generating device in sewage treatment case body inner chamber one side, set up the ozone generator at sewage treatment case body inner chamber opposite side and with set up the blow off pipe at sewage treatment case body lower extreme. But this kind of sewage treatment plant simple structure, only a sewage treatment case, the whole journey of sewage treatment process is gone on at a sewage treatment incasement, it is comparatively general to lead to the treatment effect, the sewage treatment case of this kind of structure can't leading-in new sewage when handling sewage, because the new leading-in sewage can influence the sewage treatment effect of handling at the same time, it is low to lead to sewage treatment efficiency, and the sewage treatment case of this kind of structure adds the medicine inconveniently, be difficult for adding liquid medicine according to the sewage treatment effect, also there is not the mechanism of skimming the dross, can not get rid of sewage surface dross.
[ Utility model ] content
The utility model aims at solving the problem in the prior art, providing a farm sewage deep purification processing apparatus, can improve sewage treatment efficiency, improve the sewage treatment quality, be convenient for get rid of sewage surface dross.
In order to achieve the above purpose, the utility model provides a deep purification treatment device for sewage in a farm, which comprises a first reaction tank, a second reaction tank, a third reaction tank and a fourth reaction tank which are arranged in a rectangular array, wherein a time-delay reaction tank is arranged beside the second reaction tank and the third reaction tank, the first reaction tank, the second reaction tank, the time-delay reaction tank, the third reaction tank and the fourth reaction tank are sequentially communicated, the deep purification treatment device also comprises a first medicine adding barrel, a second medicine adding barrel, a third medicine adding barrel and a fourth medicine adding barrel which are respectively communicated with the first reaction tank, the second reaction tank, the third reaction tank and the fourth reaction tank through a medicine adding pump, a scum skimming device is arranged on the time-delay reaction tank, the skimming device comprises an upper slide plate which is arranged at the upper side of the time-delay reaction tank and along the short side of the time-delay reaction tank, two ends of the upper slide plate are provided with a slide plate which can drive the deep purification treatment device to slide along the long side direction of the time-delay reaction tank to slide plate in a reciprocating manner, the slag removing device is characterized in that a slag removing basket is arranged on the lower side of the upper sliding plate and is arranged in the time-delay reaction tank, the slag removing basket comprises a main basket body which is arranged in the same direction as the upper sliding plate, a slag collecting groove which is arranged along the length direction of the main basket body is arranged in the middle of the main basket body, slag collecting inclined plates are arranged on one side or two sides of the slag collecting groove, one end of each slag collecting inclined plate extends to the upper side of the slag collecting groove, the other end of each slag collecting inclined plate extends to the position below the liquid level in the time-delay reaction tank, and the horizontal height of each slag collecting inclined plate is gradually reduced from the end of the slag collecting groove to the position far away from the end of the slag collecting groove.
Preferably, the upper side of the main basket body is vertically provided with a plurality of connecting sliding rods, and the upper ends of the connecting sliding rods penetrate through the upper sliding plate and are slidably connected with the upper sliding plate.
Preferably, a plurality of floating blocks are arranged on the main basket body.
Preferably, the upper side of the slag collecting sloping plate is provided with a scraper device matched with the slag collecting sloping plate, the scraper device comprises a driving roller and a driven roller which are arranged on the upper side of the slag collecting sloping plate, the two ends of the driving roller and the two ends of the driven roller are rotatably connected with the main basket body, a scraper belt is sleeved between the driving roller and the driven roller, and a plurality of scraper blades matched with the slag collecting sloping plate are arranged on the scraper belt.
Preferably, the upper sliding plate is provided with a liquid pump, the output end of the liquid pump is provided with a liquid pumping pipe, the liquid pumping pipe extends into the slag collecting groove and is communicated with the slag collecting groove, and the output end of the liquid pumping pump is provided with a liquid discharging pipe.
Preferably, an outer slag collecting groove is formed in the long side of the time-delay reaction tank, and the liquid discharge pipe extends to the upper side of the outer slag collecting groove.
Preferably, the slide drive device comprises slide rails arranged at two ends of the upper slide plate, the slide rails are arranged along the length directions of two sides of the time-delay reaction tank, two ends of the upper slide plate are provided with a plurality of track wheels matched with the slide rails, the slide rails are provided with racks parallel to the slide rails, and the upper slide plate is provided with a gear meshed with the racks and is used for driving the slide plate drive motor with the gear rotating.
The utility model discloses plant's sewage deep purification processing apparatus's beneficial effect: the utility model discloses a set up four reaction tanks and a time delay reaction tank, and set up four independent medicine buckets and be four reaction tanks medicine respectively, it is more convenient to add the medicine, can add suitable medicament according to sewage condition and reaction condition, be convenient for carry out fenton to plant's sewage and add the coagulation treatment, first reaction tank, the second reaction tank can add hydrogen peroxide solution and ferrous sulfate, the third reaction tank, the fourth reaction tank can add PAC, PAM, lime wash, medicaments such as soda, through at the second reaction tank, set up time delay reaction tank between the third reaction tank, through first reaction tank, the breed sewage after the second reaction tank adds the medicine and accomplishes can fully react in time delay reaction tank, the subsequent processing of being convenient for. This is implemented through setting up the scumming device with 5 upsides in the time delay reaction tank, is convenient for skimming the dross in the breed sewage, when needing to skim the dross, slide drive arrangement can drive the top slide and slide to the other end by the one end in time delay reaction tank and drive the skimming basket and slide together, under the collection sediment swash plate one end stretched into the liquid level, the skimming basket removed the in-process, the dross on the liquid level in the time delay reaction tank can be followed collection sediment swash plate and flowed into the collection sediment inslot and collect, skimming the dross is more convenient, can skim the dross automatically.
The features and advantages of the present invention will be described in detail by embodiments with reference to the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a schematic view of the overlooking structure of the deep purification treatment device for sewage of a farm of the present invention.
FIG. 2 is a schematic view of the overlooking structure of the delayed reaction tank of the advanced wastewater purification treatment device of the farm.
FIG. 3 is a schematic view of the section structure of the time-delay reaction tank of the advanced wastewater purification treatment device of the farm.
FIG. 4 is a schematic view of a side view section structure of a scum skimmer of the deep sewage purification treatment device of a farm of the present invention.
In the figure: 1-a first reaction tank, 2-a second reaction tank, 3-a third reaction tank, 4-a fourth reaction tank, 5-a time-delay reaction tank, 6-a first dosing barrel, 7-a second dosing barrel, 8-a third dosing barrel, 9-a fourth dosing barrel, 10-an upper sliding plate, 11-a skimming basket, 12-a driving roller, 13-a driven roller, 14-a scraper belt and 15-a liquid pump, 16-rack, 17-slide rail, 18-gear, 20-dosing pump, 51-outer slag collecting groove, 111-main basket body, 112-slag collecting groove, 113-slag collecting inclined plate, 114-connecting slide rod, 115-floating block, 151-liquid extracting pipe, 152-liquid discharging pipe, 171-rail wheel and 181-slide plate driving motor.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail through the accompanying drawings and embodiments. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
In the description of the present invention, it should be noted that when an element is referred to as being "fixed" or "disposed" to another element, it can be directly on the other element or be indirectly connected to the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to which the description refers must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically 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.
The first embodiment is as follows:
referring to fig. 1, fig. 2, fig. 3 and fig. 4, the utility model discloses plant sewage deep purification processing apparatus, including being first reaction tank 1, second reaction tank 2, third reaction tank 3, fourth reaction tank 4 that rectangular array set up. A time delay reaction tank 5 is arranged beside the second reaction tank 2 and the third reaction tank 3. The first reaction tank 1, the second reaction tank 2, the delay reaction tank 5, the third reaction tank 3 and the fourth reaction tank 4 are sequentially communicated, and the device further comprises a first medicine adding barrel 6, a second medicine adding barrel 7, a third medicine adding barrel 8 and a fourth medicine adding barrel 9 which are respectively communicated with the first reaction tank 1, the second reaction tank 2, the third reaction tank 3 and the fourth reaction tank 4 through a medicine adding pump 20. A scum skimming device is arranged on the delay reaction tank 5. The scum skimming device comprises an upper sliding plate 10 which is arranged on the upper side of the delay reaction tank 5 and is arranged along the short side of the delay reaction tank 5. And two ends of the upper sliding plate 10 are provided with sliding plate driving devices capable of driving the upper sliding plate to slide back and forth along the long edge direction of the time-delay reaction tank 5. A skimming basket 11 is arranged at the lower side of the upper sliding plate 10. The skimming basket 11 is arranged in the time-delay reaction tank 5. The skimmer basket 11 includes a main basket body 111 disposed in the same direction as the upper slide plate 10. The middle part of the main basket body 111 is provided with a slag collecting groove 112 arranged along the length direction. Slag collecting sloping plates 113 are arranged at two sides of the slag collecting groove 112. One end of the slag collecting sloping plate 113 extends to the upper side of the slag collecting groove 112, the other end extends to the lower part of the liquid level in the delay reaction tank 5, and the horizontal height of the slag collecting sloping plate 113 is gradually reduced from the end close to the slag collecting groove 112 to the end far away from the slag collecting groove 112. Through setting up four reaction ponds and a time delay reaction tank in this embodiment, and set up four independent medicine buckets and be four reaction ponds medicine additions respectively, it is more convenient to add the medicine, can add suitable medicament according to sewage condition and reaction condition, be convenient for carry out fenton to plant's sewage and add the coagulation treatment, first reaction pond 1, 2 addable hydrogen peroxide solution and ferrous sulfate of second reaction pond, third reaction pond 3, the PAC of fourth reaction pond 4 addable, PAM, lime wash, medicament such as soda, through at second reaction pond 2, set up time delay reaction pond 5 between third reaction pond 3, through first reaction pond 1, breed sewage after the medicine is accomplished in second reaction pond 2 can be in time delay reaction pond 5 fully reacted, be convenient for subsequent processing. Through setting up the dross skimming device with 5 upsides in the reaction tank that delays in this implementation, be convenient for skimming the dross in the breed sewage, when needing to skim the dross, slide drive arrangement can drive slide 10 by the one end of reaction tank 5 that delays slide to the other end to drive skimming basket 11 and slide together, collection sediment swash plate 113 one end stretches into under the liquid level, skimming basket 11 removes the in-process, the dross on the liquid level can follow collection sediment swash plate 113 and flow into collection sediment groove 112 and collect in the reaction tank 5 that delays, it is more convenient to skim the dross, can skim the dross automatically.
Example two:
referring to fig. 2, 3 and 4, a plurality of connecting sliding rods 114 are vertically disposed on the upper side of the main basket body 111, and the upper ends of the connecting sliding rods 114 penetrate through the upper sliding plate 10 and are slidably connected with the upper sliding plate 10. The position of the main basket body 111 can be conveniently adjusted according to the height of the liquid level in the time-delay reaction tank 5.
Referring to fig. 2, 3 and 4, the main basket 111 is provided with a plurality of floating blocks 115. The main basket body 111 floats on the liquid level in the delay reaction tank 5 through the floating block 115, so that the slag collecting inclined plate 113 can keep one end extending to the upper side of the slag collecting groove 112 and the other end extending to the lower part of the liquid level in the delay reaction tank 5. The main basket body 111 can automatically adjust the position according to the liquid level, and the use is more convenient.
Referring to fig. 2, 3 and 4, a scraper device capable of being matched with the slag collecting sloping plate 113 is arranged on the upper side of the slag collecting sloping plate 113, the scraper device comprises a driving roller 12 and a driven roller 13 which are arranged on the upper side of the slag collecting sloping plate 113, two ends of the driving roller 12 and two ends of the driven roller 13 are rotatably connected with the main basket 111, a scraper belt 14 is sleeved between the driving roller 12 and the driven roller 13, and a plurality of scraping blades 141 capable of being matched with the slag collecting sloping plate 113 are arranged on the scraper belt 14. When the driving roller 12 rotates, the scraper belt 14 is driven to rotate together, and the scraping blades 141 on the surface of the scraper belt 14 can be matched with the slag collecting sloping plate 113 to scrape the scum into the slag collecting groove 112.
Referring to fig. 2, 3 and 4, the upper slide plate 10 is provided with a liquid pump 15, an output end of the liquid pump 15 is provided with a liquid pumping pipe 151, the liquid pumping pipe 151 extends into the slag collecting groove 112 and is communicated with the slag collecting groove 112, and an output end of the liquid pumping pump 15 is provided with a liquid discharging pipe 152. Scum and sewage in the scum collecting tank 112 can be conveniently pumped out by arranging the liquid pump 15 without manual fishing, so that the automation degree is improved, and the labor force is saved.
Referring to fig. 2, 3 and 4, an outer slag collecting groove 51 is formed at the long side of the delay reaction tank 5, and a drain pipe 152 extends to the upper side of the outer slag collecting groove 51. The scum and sewage pumped by the liquid pump 15 can be directly discharged to the outer scum collecting tank 51, which is convenient for subsequent treatment.
Referring to fig. 2, 3 and 4, the slide driving device includes slide rails 17 disposed at two ends of the upper slide 10, the slide rails 17 are disposed along the length direction of two sides of the time-delay reaction tank 5, two ends of the upper slide 10 are provided with a plurality of rail wheels 171 capable of cooperating with the slide rails 17, a rack 16 is disposed beside the slide rails 17 and is parallel to the slide rails, and the upper slide 10 is provided with a gear 18 engaged with the rack 16 and a slide driving motor 181 for driving the gear 18 to rotate. The gear 18 is driven to rotate by the sliding plate driving motor 181, and then the gear can be matched with the rack 16 to drive the upper sliding plate 10 to move transversely along the rack 16 and the sliding rail 17 in a reciprocating manner, so that the driving is more convenient.
The utility model discloses the working process:
the utility model discloses a plant sewage deep purification processing apparatus is in the course of the work, sewage leads to first reaction tank 1, second reaction tank 2 in proper order, time delay reaction tank 5, third reaction tank 3, fourth reaction tank 4, first reaction tank 1, second reaction tank 2 can add hydrogen peroxide and ferrous sulfate, third reaction tank 3, fourth reaction tank 4 can add PAC, PAM, limewater, soda, etc., when sewage flows to time delay reaction tank 5, stay a certain time in time delay reaction tank 5 to carry out time delay reaction, when scum needs skimming in the reaction process, slide plate drive arrangement can drive upper slide plate 10 to slide from one end of time delay reaction tank 5 to the other end, and drive skimming basket 11 to slide together, one end of skimming swash plate 113 stretches into under the liquid level, skimming basket 11 moves in-process, scum on the liquid level in time delay reaction tank 5 can flow into the scum groove 112 along skimming swash plate 113 and collect, the scum skimming is more convenient and can be performed automatically, the scum in the scum collecting tank 112 is pumped out by the liquid pump 15, and the pumped scum and sewage can be directly discharged to the outer scum collecting tank 51.
The above-mentioned embodiment is right the utility model discloses an explanation, it is not right the utility model discloses a limited, any is right the utility model discloses scheme after simply changing all belongs to the protection scope of the utility model.
Claims (7)
1. Advanced purification treatment device of plant's sewage, including first reaction tank (1), second reaction tank (2), third reaction tank (3), fourth reaction tank (4) that are the rectangle array setting, second reaction tank (2), third reaction tank (3) are other to be equipped with time delay reaction tank (5), its characterized in that: the first reaction tank (1), the second reaction tank (2), the time-delay reaction tank (5), the third reaction tank (3) and the fourth reaction tank (4) are sequentially communicated, the first medicine adding barrel (6), the second medicine adding barrel (7), the third medicine adding barrel (8) and the fourth medicine adding barrel (9) which are respectively communicated with the first reaction tank (1), the second reaction tank (2), the third reaction tank (3) and the fourth reaction tank (4) are respectively communicated, the time-delay reaction tank (5) is provided with a scum skimming device, the scum skimming device comprises an upper sliding plate (10) which is arranged on the upper side of the time-delay reaction tank (5) and is arranged along the short side of the time-delay reaction tank (5), two ends of the upper sliding plate (10) are provided with sliding plate driving devices capable of driving the skimming basket to slide in a reciprocating manner along the long side direction of the time-delay reaction tank (5), the lower side of the upper sliding plate (10) is provided with a skimming basket (11), the skimming basket (11) is arranged in the time-delay reaction tank (5), the skimming basket (11) comprises a main basket body (111) which is arranged in the same direction as the upper sliding plate (10), a slag collecting groove (112) which is arranged along the length direction of the main basket body (111) is arranged in the middle of the main basket body (111), slag collecting inclined plates (113) are arranged on one side or two sides of the slag collecting groove (112), one end of each slag collecting inclined plate (113) extends to the upper side of the slag collecting groove (112), the other end of each slag collecting inclined plate extends to the position below the liquid level in the time-delay reaction tank (5), and the slag collecting inclined plates (113) are close to the slag collecting groove (112) to be far away from the horizontal height of the slag collecting groove (112) end to be gradually reduced.
2. A plant sewage deep purification treatment apparatus according to claim 1, characterized in that: a plurality of connecting sliding rods (114) are vertically arranged on the upper side of the main basket body (111), and the upper ends of the connecting sliding rods (114) penetrate through the upper sliding plate (10) and are in slidable connection with the upper sliding plate (10).
3. A plant sewage deep purification treatment apparatus according to claim 2, characterized in that: the main basket body (111) is provided with a plurality of floating blocks (115).
4. A plant sewage deep purification treatment apparatus according to claim 1, characterized in that: the slag collecting sloping plate is characterized in that a scraper device capable of being matched with the slag collecting sloping plate is arranged on the upper side of the slag collecting sloping plate (113), the scraper device comprises a driving roller (12) and a driven roller (13) which are arranged on the upper side of the slag collecting sloping plate (113), two ends of the driving roller (12) and two ends of the driven roller (13) are rotatably connected with the main basket body (111), a scraper belt (14) is sleeved between the driving roller (12) and the driven roller (13), and a plurality of scraping blades (141) capable of being matched with the slag collecting sloping plate (113) are arranged on the scraper belt (14).
5. A plant sewage deep purification treatment apparatus according to claim 1, characterized in that: go up slide (10) on be equipped with drawing liquid pump (15), drawing liquid pump (15) output is equipped with liquid suction pipe (151), drawing liquid pipe (151) extend to in collection sediment groove (112) and with collection sediment groove (112) intercommunication, drawing liquid pump (15) output is equipped with fluid-discharge tube (152).
6. A plant sewage deep purification treatment device according to claim 5, characterized in that: the long side of the time delay reaction tank (5) is provided with an outer slag collecting groove (51), and the drain pipe (152) extends to the upper side of the outer slag collecting groove (51).
7. A deep purification treatment device for sewage of a farm according to claim 1, characterized in that: slide drive arrangement including locating slide rail (17) at slide-plate (10) both ends go up, slide rail (17) are followed time delay reaction tank (5) both sides length direction sets up, go up slide plate (10) both ends be equipped with a plurality of can with slide rail (17) complex rail wheel (171), slide rail (17) other be equipped with rather than rack (16) parallel relatively, go up be equipped with on slide plate (10) with gear (18) of rack (16) meshing and be used for the drive slide driving motor (181) of gear (18) rotation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220575867.XU CN217103371U (en) | 2022-03-16 | 2022-03-16 | Advanced sewage purification treatment device for farm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220575867.XU CN217103371U (en) | 2022-03-16 | 2022-03-16 | Advanced sewage purification treatment device for farm |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117585872A (en) * | 2024-01-19 | 2024-02-23 | 广州众行环保科技有限公司 | Two-stage AO integrated sewage treatment system |
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2022
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117585872A (en) * | 2024-01-19 | 2024-02-23 | 广州众行环保科技有限公司 | Two-stage AO integrated sewage treatment system |
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