CN102718321B - Rotary type recycle ratio adjustable oxidation ditch device and operating method thereof - Google Patents
Rotary type recycle ratio adjustable oxidation ditch device and operating method thereof Download PDFInfo
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- CN102718321B CN102718321B CN 201210245285 CN201210245285A CN102718321B CN 102718321 B CN102718321 B CN 102718321B CN 201210245285 CN201210245285 CN 201210245285 CN 201210245285 A CN201210245285 A CN 201210245285A CN 102718321 B CN102718321 B CN 102718321B
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Abstract
The invention discloses a rotary type recycle ratio adjustable oxidation ditch device and an operating method of the rotary type recycle ratio adjustable oxidation ditch device. The device comprises an anaerobic pool (2), an oxidation ditch pool (3) and a sedimentation pool (4), wherein a first stirrer (9) is arranged inside the anaerobic pool (2); a second stirrer (10) and a third stirrer (11) are respectively arranged at two ends of the oxidation ditch pool (3); the oxidation ditch pool (3) is divided into an aerobic zone and an anoxic zone; a micropore aerator (13) is arranged inside the aerobic zone; and rotary type recycle ratio regulating devices (12) are respectively arranged at the starting end of the aerobic zone and the starting end of the anoxic zone. The rotary type recycle ratio adjustable oxidation ditch device has the advantages that other operation parameters are not changed; no chemical agents are used; the pollution cleaning effect of the oxidation ditch can be greatly improved by only regulating the recycle ratio; and furthermore a higher removing rate can be achieved during denitrification and dephosphorization at the same time; and in comparison with other activated slime process for realizing the same processing effect, the oxygen consumption and the electricity consumption are saved.
Description
Technical field
The invention belongs to the technical field of sewage in the environmental engineering, relate to the adjustable oxidation ditch device of a kind of rotary recycle ratio and working method thereof.
Background technology
1954, First oxidation ditch sewage work set up in Holland in the world, had gone through the development of decades.At present, in oxidation ditch process design specifications or the handbook all not with recycle ratio (circular flow that circulation gallery section passes through and the ratio of flooding velocity) as process design parameter.In the design process, often select the design parameter value such as sludge concentration, sludge loading, sludge age according to design specifications or handbook, calculate afterwards the required volume of oxidation ditch, at last according to requirements such as places, determine width of corridor, the degree of depth and length and the gallery number of oxidation ditch, finally cause built oxidation ditch process recycle ratio widely different, seen Table 1.
The recycle ratio of the built oxidation ditch process of table 1
Annotate: Q
TOT=86400vBH=Q
In+ R
SQ
In+ RQ
InTherefore,
In the formula: Q
TOT--by the total flux of circulation gallery section, m
3/ d; Q
In--single seat oxidation ditch flooding velocity, m
3/ d
The R--recycle ratio; The B--gallery is wide, m; The H--available depth, m; 86400-time unit second and a day transformation ratio.
R
S--return sludge ratio, estimate and get 1 (namely 100%); V--mixed solution flow velocity is estimated and is got 0.3m/s.
Because recycle ratio is not taken into account as the design variable person of being designed in the oxidation ditch process design.In addition, after sewage work went into operation and moves, flooding velocity was not the parameter that managerial personnel can regulate and control, but is determined by extraneous circumstance.Built oxidation ditch process system gallery wide (B) and available depth (H, be at the bottom of the oxidation ditch pond upper surface to the oxidation ditch pond distance of high design water level) be definite value.And the too small meeting of the flow velocity of mixed solution in ditch causes the sludge settling alluvial.The excessive one side of flow velocity can cause operation uneconomical; Active sludge flco particle diameter is diminished, and muddy water mixed solution enters settling property variation behind the settling tank by the oxidation ditch pond like this, finally can make the effluent quality variation of oxidation ditch process system.So the mixed solution flow velocity often remains on about 0.3m/s in the oxidation ditch.The return sludge ratio of oxidation ditch process system (being back to the sludge quantity of reaction tank and the ratio of flooding velocity by settling tank) empirical value (being 75%-150%) between 0.75-1.5, numerical value is less, so the minor fluctuations of return sludge ratio Rs does not have a significant impact Circle ratio.
In existing oxidation ditch process technology, have and in the circulation gallery, install the plate with certain pore size additional, but the open area of plate fix, therefore for such oxidation ditch process, its recycle ratio can not be regulated, and also is definite value.
In summary, there is following problem in the existing oxidation ditch process technology: but recycle ratio fails to become the Process operating parameters of Effective Regulation, has therefore caused not adding the oxidation ditch process that chemical agent only relies on the active sludge microorganism Degradation and has been difficult to make denitrogenation dephosphorizing to reach simultaneously higher clearance.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of rotary recycle ratio adjustable oxidation ditch device.
Second purpose of the present invention provides the working method of the adjustable oxidation ditch device of a kind of rotary recycle ratio.
Technical scheme of the present invention is summarized as follows:
The adjustable oxidation ditch device of a kind of rotary recycle ratio, anaerobic pond 2 is connected with the feed-water end of oxidation ditch pond 3, settling tank 4, sludge reflux pump 5 successively by pipeline, and the water side of sludge reflux pump 5 is connected with anaerobic pond 2 by pipeline; Be provided with water inlet pipe 1 on the sidewall of anaerobic pond 2; Be provided with threeway 6 on the pipeline of the feed-water end of connection settling tank 4 and sludge reflux pump 5, the 3rd outlet of threeway 6 is connected with excess sludge discharge pipe 7; The top of settling tank 4 is provided with rising pipe 8; Be provided with the first agitator 9 in anaerobic pond 2 inside; Be respectively arranged with the second agitator 10 and the 3rd agitator 11 at the two ends in oxidation ditch pond 3; Oxidation ditch pond 3 is divided into aerobic zone and oxygen-starved area, in aerobic zone, be provided with micro-hole aerator 13, be respectively arranged with rotary recycle ratio adjusting device 12 at aerobic zone initiating terminal and oxygen-starved area initiating terminal, described rotary recycle ratio adjusting device 12 comprises operating stick 14, the middle part of operating stick 14 is fixedly connected with the middle part of rotating sluice 18, the bottom of operating stick 14 is flexibly connected by overcoat bearing 20 and operating stick Connection Block 21, leave passage between the upper surface at the bottom of the lower edge of rotating sluice 18 and 3 ponds, oxidation ditch pond, the top of operating stick 14 and service platform 17 are flexibly connected, and the top of operating stick 14 is connected with electrically operated device or manual operation rotating disk.
The working method of the adjustable oxidation ditch device of a kind of rotary recycle ratio comprises the steps:
Step 1: prepare the adjustable oxidation ditch device of a kind of rotary recycle ratio, anaerobic pond 2 is connected with the feed-water end of oxidation ditch pond 3, settling tank 4, sludge reflux pump 5 successively by pipeline, and the water side of sludge reflux pump 5 is connected with anaerobic pond 2 by pipeline; Be provided with water inlet pipe 1 on the sidewall of anaerobic pond 2; Be provided with threeway 6 on the pipeline of the feed-water end of connection settling tank 4 and sludge reflux pump 5, the 3rd outlet of threeway 6 is connected with excess sludge discharge pipe 7; The top of settling tank 4 is provided with rising pipe 8; Be provided with the first agitator 9 in anaerobic pond 2 inside; Be respectively arranged with the second agitator 10 and the 3rd agitator 11 at the two ends in oxidation ditch pond 3; Oxidation ditch pond 3 is divided into aerobic zone and oxygen-starved area, in aerobic zone, be provided with micro-hole aerator 13, be respectively arranged with rotary recycle ratio adjusting device 12 at aerobic zone initiating terminal and oxygen-starved area initiating terminal, described rotary recycle ratio adjusting device 12 comprises operating stick 14, the middle part of operating stick 14 is fixedly connected with the middle part of rotating sluice 18, the bottom of operating stick 14 is flexibly connected by overcoat bearing 20 and operating stick Connection Block 21, leave passage between the upper surface at the bottom of the lower edge of rotating sluice 18 and 3 ponds, oxidation ditch pond, the top of operating stick 14 and service platform 17 are flexibly connected, and the top of operating stick 14 is connected with electrically operated device or manual operation rotating disk;
Step 2: raw waste water is flowed into anaerobic pond 2 from water inlet pipe 1, the returned sluge in autoprecipitation pond 4 pumps into anaerobic pond 2 through sludge reflux pump 5 in the future simultaneously, raw waste water and returned sluge mix under the effect of the first agitator 9 and react, the muddy water mixed solution that forms flows into oxidation ditch pond 3, open micro-hole aerator 13, the second agitator 10 and the 3rd agitator 11, the muddy water mixed solution in the oxidation ditch pond 3 circulates in oxygen-starved area and aerobic interval; The angle θ that opens two rotary recycle ratio adjusting devices 12 and keep rotating sluice 18 to open is consistent, and described 0 °≤θ≤90 ° is used for the flow section area of the circulation gallery in change oxidation ditch pond 3, thereby changes the recycle ratio in oxidation ditch pond 3; Muddy water mixed solution flows into settling tank 4 through pipeline; Settling tank 4 supernatant liquids are discharged through rising pipe 8, and settling tank 4 bottom mud parts pump into anaerobic pond 2 through sludge reflux pump 5, and another part discharges through excess sludge discharge pipe 7 by threeway 6; The working method of rotary recycle ratio adjusting device is: rotate along vertical line by electrically operated device or manual operation rotating disk red-tape operati bar 14, the rotation driven rotary flashboard 18 of operating stick 14 rotates.
The present invention has following beneficial effect:
(1) do not change other operating parameter, do not use chemical agent, only can significantly improve the scrubbing effect of oxidation ditch by regulating recycle ratio, and can make denitrogenation dephosphorizing reach simultaneously higher clearance.
(2) compare with other activated sludge process of realizing the same treatment effect, can save oxygen-consumption about 30% and about 15% current consumption.
(3) compare with conventional activated sludge process, saved internal reflux pump house and the internal reflux pump of aerobic zone to the oxygen-starved area backflow mixed liquor, reduced floor space, saved fabrication cost.
(4) compare with other activated sludge process, enlarged the reflux ratio regulation range of aerobic zone to the oxygen-starved area backflow mixed liquor, increased the adaptability of oxidation ditch process to influent quality, water yield fluctuation.
(5) simple to having sewage work's reforming mode that oxidation ditch process is set now.
Description of drawings
Fig. 1 is the structural representation of the adjustable oxidation ditch device of a kind of rotary recycle ratio of the present invention.
Fig. 2 is rotary recycle ratio adjusting device structural representation.
Embodiment
The present invention makes sewage through anaerobism, anoxic, Aerobic has been realized simultaneously denitrogenation dephosphorizing, the open degree of regulating during this period the rotating sluice of oxidation ditch pond internal rotation type recycle ratio adjusting device changes the flow section area of the circulation gallery in oxidation ditch pond, regulate and control the recycle ratio of oxidation ditch pond mixed solution with this, change cycle (mixed solution circulates time in a week at oxygen-starved area and aerobic zone) of mixed solution oxygen-starved area and aerobic zone circulation in the oxidation ditch pond and frequency (number of times that mixed solution circulates at oxygen-starved area and aerobic zone in the unit time), finally under the best open degree of recycle ratio adjusting device, can make the denitrogenation dephosphorizing of the adjustable oxidation ditch device of a kind of rotary recycle ratio of the present invention reach simultaneously higher clearance.
The present invention is further illustrated below in conjunction with accompanying drawing.
The adjustable oxidation ditch device of a kind of rotary recycle ratio, anaerobic pond 2 is connected with the feed-water end of oxidation ditch pond 3, settling tank 4, sludge reflux pump 5 successively by pipeline, and the water side of sludge reflux pump 5 is connected with anaerobic pond 2 by pipeline; Be provided with water inlet pipe 1 on the sidewall of anaerobic pond 2; Be provided with threeway 6 on the pipeline of the feed-water end of connection settling tank 4 and sludge reflux pump 5, the 3rd outlet of threeway 6 is connected with excess sludge discharge pipe 7; The top of settling tank 4 is provided with rising pipe 8; Be provided with the first agitator 9 in anaerobic pond 2 inside; Be respectively arranged with the second agitator 10 and the 3rd agitator 11 at the two ends in oxidation ditch pond 3; Oxidation ditch pond 3 is divided into aerobic zone and oxygen-starved area, in aerobic zone, be provided with micro-hole aerator 13, be respectively arranged with rotary recycle ratio adjusting device 12 at aerobic zone initiating terminal and oxygen-starved area initiating terminal, described rotary recycle ratio adjusting device 12 comprises operating stick 14, the middle part of operating stick 14 is fixedly connected with the middle part of rotating sluice 18, the bottom of operating stick 14 is flexibly connected by overcoat bearing 20 and operating stick Connection Block 21, leave passage between the upper surface at the bottom of the lower edge of rotating sluice 18 and 3 ponds, oxidation ditch pond, the top of operating stick 14 and service platform 17 are flexibly connected, and the top of operating stick 14 is connected with electrically operated device or manual operation rotating disk.
The working method of the adjustable oxidation ditch device of a kind of rotary recycle ratio comprises the steps:
Step 1: prepare the adjustable oxidation ditch device of a kind of rotary recycle ratio, anaerobic pond 2 is connected with the feed-water end of oxidation ditch pond 3, settling tank 4, sludge reflux pump 5 successively by pipeline, and the water side of sludge reflux pump 5 is connected with anaerobic pond 2 by pipeline; Be provided with water inlet pipe 1 on the sidewall of anaerobic pond 2; Be provided with threeway 6 on the pipeline of the feed-water end of connection settling tank 4 and sludge reflux pump 5, the 3rd outlet of threeway 6 is connected with excess sludge discharge pipe 7; The top of settling tank 4 is provided with rising pipe 8; Be provided with the first agitator 9 in anaerobic pond 2 inside; Be respectively arranged with the second agitator 10 and the 3rd agitator 11 at the two ends in oxidation ditch pond 3; Oxidation ditch pond 3 is divided into aerobic zone and oxygen-starved area, in aerobic zone, be provided with micro-hole aerator 13, be respectively arranged with rotary recycle ratio adjusting device 12 at aerobic zone initiating terminal and oxygen-starved area initiating terminal, described rotary recycle ratio adjusting device 12 comprises operating stick 14, the middle part of operating stick 14 is fixedly connected with by taper pin 19 with the middle part of rotating sluice 18, the bottom of operating stick 14 is flexibly connected by overcoat bearing 20 and operating stick Connection Block 21, leave passage between the upper surface at the bottom of the lower edge of rotating sluice 18 and 3 ponds, oxidation ditch pond, the top of operating stick 14 and service platform 17 are flexibly connected, (the second overcoat bearing can reduce the wearing and tearing of operating stick and service platform contact part operating stick preferably to be provided with the second overcoat bearing 16 in the position that operating stick is connected with service platform, reduce swinging moment), the top of operating stick 14 is provided with connecting key 15, to connect electrically operated device (commercially available) or the manual operation rotating disk (commercially available) with angle of rotation telltale and auto-lock function (preventing that operating stick from rotating voluntarily in the off-duty situation of operating gear).
Step 2: raw waste water is flowed into anaerobic pond from water inlet pipe, the returned sluge in autoprecipitation pond pumps into anaerobic pond through sludge reflux pump in the future simultaneously, raw waste water and returned sluge mix under the effect of the first agitator and react, the muddy water mixed solution that forms flows into the oxidation ditch pond, open micro-hole aerator, the second agitator and the 3rd agitator, the muddy water mixed solution in the oxidation ditch pond circulates in oxygen-starved area and aerobic interval; The angle θ that opens two rotary recycle ratio adjusting devices and keep rotating sluice to open is consistent, described 0 °≤θ≤90 ° of flow section areas that are used for the circulation gallery in change oxidation ditch pond, thereby the recycle ratio in change oxidation ditch pond; Muddy water mixed solution flows into settling tank through pipeline; The settling tank supernatant liquid is discharged through rising pipe, and a settling tank bottom mud part pumps into anaerobic pond through sludge reflux pump, and another part is by the three excess sludge discharge tube drainages that stimulate the menstrual flow.
The upper edge of rotating sluice is concordant with the highest design water level in the oxidation ditch pond, leave passage between the upper surface at the bottom of the lower edge of rotating sluice and the pond in oxidation ditch pond, its distance is the available depth in the 1/30(oxidation ditch pond of oxidation ditch pond available depth, be at the bottom of the oxidation ditch pond upper surface to the oxidation ditch pond distance of high design water level), the rotating sluice width is wide consistent with the place gallery.The working method of rotary recycle ratio adjusting device is: rotate along vertical line by electrically operated device or manual operation rotating disk red-tape operati bar, the rotation driven rotary flashboard of operating stick rotates.
Adopt the adjustable oxidation ditch device of rotary recycle ratio shown in Figure 1, dissolved oxygen concentration is that the aerobic zone initiating terminal at 0.5mg/L place and oxygen-starved area initiating terminal that dissolved oxygen concentration is the 0.5mg/L place arrange respectively two rotary recycle ratio adjusting devices in oxidation ditch pond circulation gallery.Experimental stage, with rotating sluice opening angle θ be opened into 0 ° (rotating sluice is closed fully, muddy water mixed solution only from the flashboard foot passage by), rotating sluice opening angle θ is opened is 90 ° (flashboard is opened fully).
Embodiment 1
Flooding quantity 50L/h, hydraulic detention time HRT=12h, return sludge ratio R
S=100%, sludge age SRT=12d, mixed solution sludge concentration MLSS=4000mg/L, device water inlet and effluent quality of sedimentation tank and removal effect see Table 2.
The different open degree scrubbing of oxidation ditch device effect that the rotary recycle ratio of table 2 is adjustable
Embodiment 2:
Flooding quantity 50L/h, hydraulic detention time HRT=12h, return sludge ratio R
S=100%, sludge age SRT=12d, mixed solution sludge concentration MLSS=4000mg/L, device water inlet and effluent quality of sedimentation tank and removal effect see Table 3.
The different open degree scrubbing of oxidation ditch device effect that the rotary recycle ratio of table 3 is adjustable
Embodiment 3:
Flooding quantity 60L/h, hydraulic detention time HRT=10h, return sludge ratio R
S=100%, sludge age SRT=12d, mixed solution sludge concentration MLSS=4000mg/L, device water inlet and effluent quality of sedimentation tank and removal effect see Table 4.
The different open degree scrubbing of oxidation ditch device effect that the rotary recycle ratio of table 4 is adjustable
Experimental results show that, when the upper edge of rotating sluice concordant with the highest design water level in the oxidation ditch pond, distance between the upper surface at the bottom of the lower edge of rotating sluice and the pond in oxidation ditch pond is 1/30 of oxidation ditch pond available depth, the rotating sluice width is wide consistent with the place gallery, the angle θ that rotating sluice is opened is in 25 °≤θ≤65 °, effluent quality of sedimentation tank can reach the one-level B standard in " urban wastewater treatment firm pollutant emission standard (GB18918-2002) ", find best opening angle θ=45 ° by test in the best setting scope, this moment, the settling tank water outlet can reach the one-level A standard in " urban wastewater treatment firm pollutant emission standard (GB18918-2002) ".
If the height on edge on the reduction rotating sluice, or change distance between the upper surface at the bottom of the pond in the lower edge of rotating sluice and oxidation ditch pond, or reduce the rotating sluice width, the scope of opening angle θ that then obviously improves the rotating sluice for the treatment of effect can change to some extent.
Claims (2)
1. adjustable oxidation ditch device of rotary recycle ratio, anaerobic pond (2) is connected with the feed-water end of oxidation ditch pond (3), settling tank (4), sludge reflux pump (5) successively by pipeline, and the water side of sludge reflux pump (5) is connected with anaerobic pond (2) by pipeline; Be provided with water inlet pipe (1) on the sidewall of anaerobic pond (2); Be provided with threeway (6) on the pipeline of the feed-water end of connection settling tank (4) and sludge reflux pump (5), the 3rd outlet of threeway (6) is connected with excess sludge discharge pipe (7); The top of settling tank (4) is provided with rising pipe (8); Be provided with the first agitator (9) in anaerobic pond (2) inside; Be respectively arranged with the second agitator (10) and the 3rd agitator (11) at the two ends of oxidation ditch pond (3); Oxidation ditch pond (3) is divided into aerobic zone and oxygen-starved area, in described aerobic zone, be provided with micro-hole aerator (13), be respectively arranged with rotary recycle ratio adjusting device (12) at aerobic zone initiating terminal and oxygen-starved area initiating terminal, described rotary recycle ratio adjusting device (12) comprises operating stick (14), the middle part of operating stick (14) is fixedly connected with the middle part of rotating sluice (18), the bottom of operating stick (14) is flexibly connected by overcoat bearing (20) and operating stick Connection Block (21), leave passage between the upper surface at the bottom of the lower edge of rotating sluice (18) and the pond, oxidation ditch pond (3), the top of operating stick (14) and service platform (17) are flexibly connected, and the top of operating stick (14) is connected with electrically operated device or manual operation rotating disk.
2. the working method of the adjustable oxidation ditch device of rotary recycle ratio is characterized in that comprising the steps:
Step 1: prepare the adjustable oxidation ditch device of a kind of rotary recycle ratio, anaerobic pond (2) is connected with the feed-water end of oxidation ditch pond (3), settling tank (4), sludge reflux pump (5) successively by pipeline, and the water side of sludge reflux pump (5) is connected with anaerobic pond (2) by pipeline; Be provided with water inlet pipe (1) on the sidewall of anaerobic pond (2); Be provided with threeway (6) on the pipeline of the feed-water end of connection settling tank (4) and sludge reflux pump (5), the 3rd outlet of threeway (6) is connected with excess sludge discharge pipe (7); The top of settling tank (4) is provided with rising pipe (8); Be provided with the first agitator (9) in anaerobic pond (2) inside; Be respectively arranged with the second agitator (10) and the 3rd agitator (11) at the two ends of oxidation ditch pond (3); Oxidation ditch pond (3) is divided into aerobic zone and oxygen-starved area, in described aerobic zone, be provided with micro-hole aerator (13), be respectively arranged with rotary recycle ratio adjusting device (12) at aerobic zone initiating terminal and oxygen-starved area initiating terminal, described rotary recycle ratio adjusting device (12) comprises operating stick (14), the middle part of operating stick (14) is fixedly connected with the middle part of rotating sluice (18), the bottom of operating stick (14) is flexibly connected by overcoat bearing (20) and operating stick Connection Block (21), leave passage between the upper surface at the bottom of the lower edge of rotating sluice (18) and the pond, oxidation ditch pond (3), the top of operating stick (14) and service platform (17) are flexibly connected, and the top of operating stick (14) is connected with electrically operated device or manual operation rotating disk;
Step 2: raw waste water is flowed into anaerobic pond (2) from water inlet pipe (1), the returned sluge of autoprecipitation pond (4) pumps into anaerobic pond (2) through sludge reflux pump (5) in the future simultaneously, raw waste water and returned sluge mix under the effect of the first agitator (9) and react, the muddy water mixed solution that forms flows into oxidation ditch pond (3), open micro-hole aerator (13), the second agitator (10) and the 3rd agitator (11), the muddy water mixed solution in oxidation ditch pond (3) circulates in oxygen-starved area and aerobic interval; The angle θ that opens two rotary recycle ratio adjusting devices (12) and keep rotating sluice (18) to open is consistent, is used for the flow section area of the circulation gallery in change oxidation ditch pond (3), thereby changes the recycle ratio in oxidation ditch pond (3); Muddy water mixed solution flows into settling tank (4) through pipeline; Settling tank (4) supernatant liquid is discharged through rising pipe (8), and settling tank (a 4) bottom mud part pumps into anaerobic pond (2) through sludge reflux pump (5), and another part discharges through excess sludge discharge pipe (7) by threeway (6); The working method of rotary recycle ratio adjusting device is: rotate along vertical line by electrically operated device or manual operation rotating disk red-tape operati bar (14), the rotation driven rotary flashboard (18) of operating stick (14) rotates.
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| CN103204585B (en) * | 2012-10-17 | 2017-06-20 | 华鸿水务集团有限公司 | Sewage disposal process by activated sludge process |
| CN105060469A (en) * | 2015-07-30 | 2015-11-18 | 天津霍普环保科技有限公司 | Sewage treatment reactor |
| CN106745741A (en) * | 2016-12-26 | 2017-05-31 | 天津城建大学 | The anaerobic oxidation ditch and its operating method of intensified anti-nitrated denitrogenation dephosphorizing |
| CN106630498B (en) * | 2017-02-21 | 2023-07-25 | 云南水务投资股份有限公司 | Integrated village and town sewage treatment equipment |
| CN110746037A (en) * | 2019-09-29 | 2020-02-04 | 广西皖维生物质科技有限公司 | Pretreatment method of high-concentration organic wastewater |
| CN117585743B (en) * | 2024-01-18 | 2024-04-16 | 浙江浙达水业有限公司 | Sewage treatment regulating tank and regulating method |
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| CN200981836Y (en) * | 2006-11-07 | 2007-11-28 | 张新春 | Concentric nesting active oxidation channel |
| CN101041509B (en) * | 2007-04-24 | 2010-05-19 | 上海亚同环保实业有限公司 | Circulation flow ring-shaped biological denitrification phosphorous removal technique |
| CN101844829A (en) * | 2009-11-17 | 2010-09-29 | 天津城市建设学院 | High-efficiency biological nitrogen and phosphorus removal oxidation ditch |
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