CN206447641U - A kind of biological treatment system suitable for domestic sewage of villages and small towns - Google Patents
A kind of biological treatment system suitable for domestic sewage of villages and small towns Download PDFInfo
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- CN206447641U CN206447641U CN201621438832.2U CN201621438832U CN206447641U CN 206447641 U CN206447641 U CN 206447641U CN 201621438832 U CN201621438832 U CN 201621438832U CN 206447641 U CN206447641 U CN 206447641U
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Abstract
The utility model discloses a kind of biological treatment system suitable for domestic sewage of villages and small towns, including the water inlet regulating reservoir by separator lined, aerobic Ith area and aerobic IIth area, anaerobic selection area and the functional areas of anoxic zone five, the water inlet regulating reservoir is adjacent with aerobic Ith area, aerobic IIth area and anaerobic selection area, and anoxic zone is located at aerobic Ith area, aerobic IIth area and anaerobic selection area avris；Five functional areas are interconnected, wherein, water inlet regulating reservoir is sequentially communicated by pipeline with anaerobic selection area, aerobic IIth area, provided with the top outlet pipe for leading to biological treatment system above aerobic IIth area；Aerobic Ith area, aerobic IIth area, anaerobic selection area and anoxic zone are connected by overflow or perforate.The system footprint area is few, operation energy consumption is low, equipment is few, operation is simple to operate, by the way of intermittent water inflow is run, and can adapt to the domestic sewage of villages and small towns processing requirement under various water quality and quantity changes, treatment effeciency is high, high treating effect, adjustable range is wide, it is easy to promote the use of.
Description
Technical field
The utility model belongs to water-treatment technology field, and in particular to a kind of biological treatment system of domestic sewage of villages and small towns.
Background technology
China's rural environment comprehensive improvement is just promoted and come in China, and the collection for village sanitary sewage is handled
Project is in full flourish, but the rural domestic sewage treatment project having been carried out at present has the method for indiscriminately imitating urban wastewater treatment,
From substantial amounts of processing equipment, the occupation of land of sewage disposal system is too big, it is difficult to operational management, builds and running cost is too high.And deposit
In rural area, land used is compact, and technical staff is seriously equipped with deficiency, and village economy level is low to produce great contradiction.
Therefore, it is badly in need of a kind of disposal ability height, operational outfit at present few, operation maintenance ease of Use dirty suitable for rural area
The brand-new sewage disposal system of water water quality, water change and rural area Technological Economy present situation improves this situation.
Utility model content
In order to solve the problems caused by existing rural sewage treatment technological deficiency, the utility model provides a kind of special
Not Shi He domestic sewage of villages and small towns processing biological treatment system occupation of land province, few operating cost, reduced investment, small accommodation area, place
The strong villages and small towns sewage treatment technique system of reason ability.
The purpose of this utility model is achieved by the following technical solution.
The one embodiment provided according to the utility model, the utility model provides a kind of suitable for domestic sewage of villages and small towns
Biological treatment system, including water inlet regulating reservoir, aerobic Ith area and aerobic IIth area by separator lined, anaerobic selection area and
The functional areas of anoxic zone five, the water inlet regulating reservoir is adjacent with aerobic Ith area, aerobic IIth area and anaerobic selection area, anoxic position
In aerobic Ith area, aerobic IIth area and anaerobic selection area avris；Five functional areas are interconnected, wherein, water inlet regulating reservoir passes through pipe
Road is sequentially communicated with anaerobic selection area, aerobic IIth area, provided with the water outlet led at the top of biological treatment system above aerobic IIth area
Pipe；Aerobic Ith area, aerobic IIth area, anaerobic selection area and anoxic zone are connected by overflow or perforate.
Further, sewage pump is provided with the water inlet regulating reservoir, sewage pump is communicated to anaerobism by connecting tube
Selection area is connected with negative pressure proportioner, and negative pressure proportioner returns mud pipeline by bottom of pond and is communicated to aerobic IIth area.
Further, aerobic Ith area is L-type, and aerobic IIth area is trapped among in its frame, and aerobic IIth area is inverted pyramidal structures,
Bottom of pond returns mud pipeline and is communicated to aerobic IIth area bottom of pond.
Further, mixed liquor stripping tube is distributed with the aerobic IIth area top.
Further, the exposure in array distribution is equipped with aerobic Ith area, aerobic IIth area, anaerobic selection area and anoxic zone
Gas device.
Further, the anaerobic selection area is provided with denitrification stripping tube with anoxic zone sides adjacent.
Further, Liquid level flap valve is provided between the anoxic zone and anaerobic selection area.
Further, connected between aerobic Ith area and aerobic IIth area by water hole；Anaerobic selection area → anoxic zone → good
The area's divider height of oxygen I is reduced successively.
Further, adding in aerobic Ith area and aerobic IIth area, anaerobic selection area and anoxic zone has biologic packing material.
Further, the water inlet regulating reservoir is furnished with liquid level regulator；The aerator passage time relay is adjusted with liquid level
Save the start and stop of device coordinated signals blower fan；Provided with the dissolved oxygen on-line computing model for measuring water-soluble oxygen in aerobic IIth area.
The characteristics of the utility model, is：
1) low (ton water process energy consumption converts into power consumption for the system footprint area few (ton water take up an area be less than 0.5 flat), operation energy consumption
Less than 0.5 degree electricity), equipment is few, operation is (staffing is simpler, can further reduce operation and maintenance expenses use) simple to operate, between
Have a rest into the mode of water running, can adapt to the domestic sewage of villages and small towns processing requirement under various water quality and quantity changes, treatment effeciency is high,
High treating effect, adjustable range is wide, it is easy to promote the use of.
The utility model biological treatment system is a kind of using water inlet replacement water outlet, without volume adjustment, without water decanter
CASS modified form techniques, be particularly suitable for domestic sewage of villages and small towns water quality, water with the time, geographical position change greatly the characteristics of,
Organic wastewater of the utility model system by parameter adjustment simultaneously suitable for other easy biochemical treatments, size can be adjusted, spirit
Active high, engineering construction cost is low, the simple cost saving of operation maintenance, and the adaptability to medium and small treatment scale is extremely strong.
2) the utility model system investments are only same treatment scale, the 50%~70% of Water quality processing system, take up an area face
Product reduces more than 40%, and energy consumption reduces more than 50%, and operational outfit quantity reduces half, therefore operation maintenance difficulty
Obtain great simplification, cost of labor can reduce by more than 40%, the sewage treating efficiency of simultaneity factor, impact resistance, TN,
The TP more conventional biochemical process of removal ability is greatly improved.
3) principle that the utility model improves TN, TP removal ability is：Sludge is carried out during water inlet by being back to selection area,
PolyP bacteria is set to release phosphorus completely, while the design of biochemical reactor pond body fluidised form makes sludge reflux and water inlet；During aerated reaction, storage
High carbon source raw water in anaerobic selection area provides denitrification electron donor, and two stripping reflux systems link with aerated reaction waterpower
The characteristics of ensure that the low energy consumption that the safety automation based on hydraulic principle and low device configuration of system are brought.
The system uses the pattern that intermittent water inflow reacts, and is carried from the much bigger sewage of flow of inlet water is reacted compared with continuum micromeehanics
Pump is risen, is conducive to the type selecting and energy-conservation of sewage lifting device.
4) the utility model utilizes the rich air quantity of aerator to raw water carbon source needed for mixed liquor, denitrification using air stripper
Stripping reflux is carried out, Air Valve Control capacity of returns is passed through according to system process requirement.
5) fill phase sludge reflux of the present utility model is by the bottom of pond pressure pipe end installation negative pressure in selection area
Proportioner, realizes that sewage simultaneously, is determined than mixing with sludge.When system water is smaller or when having other particular/special requirements, no
Beneficial to negative pressure proportioner is used, consider further that and carry out forcing power backflow using Driving-mud Pump.
6) the utility model is suitable for the water quality requirement of a variety of influent concentrations, when influent concentration is middle and high concentration, uses
Conventional activated sludge process pattern, need to be in aerobic zone, anaerobic selection area and anoxic zone reactor when influent density is relatively low
The interior biologic packing material for installing certain volume, makes system keep the food of average weighing apparatus micro- than (F/M), it is ensured that food web and ecological chain it is flat
Weighing apparatus.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the technical scheme in the utility model embodiment or technology
There is the accompanying drawing that uses required in technology description to be briefly described, it should be apparent that, under in the de-scription attached be only this practicality
Some new embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structure function area schematic diagram that the utility model is applied to villages and small towns rural domestic sewage treatment system；
Fig. 2 is the Ith stage (water inlet bleeding stage) water flow field and handling principle schematic diagram；
Fig. 3 is the IIth stage (aerated reaction stage) water flow field and handling principle schematic diagram；
Fig. 4 is the IIIth stage (quiet heavy mud-water separation stage) water flow field and handling principle schematic diagram；
Fig. 5 is fill phase, negative pressure proportioner sludge reflux schematic diagram.
In figure：1st, water inlet regulating reservoir；2nd, sewage pump；3rd, aerobic Ith area；4th, aerobic IIth area；5th, bottom of pond returns mud pipeline；6、
Aerator；7th, negative pressure proportioner；8th, anaerobic selection area；9th, mixed-liquor return pipe；10th, Liquid level flap valve；11st, denitrification
Carbon source tracheae；12nd, anoxic zone；13rd, outlet pipe；14th, water hole.
Embodiment
The utility model is described in detail with reference to the accompanying drawings and detailed description.
It will be understood to those of skill in the art that the following example is merely to illustrate the utility model, and it should not be regarded as limiting
Scope of the present utility model.In the examples where no specific technique or condition is specified, according to the skill described by document in the art
Art or condition are carried out according to product description.The unreceipted production firm person of device therefor, tubing, pipe fitting, is to lead to
Cross the conventional products that purchase is wherein selected.
As shown in figure 1, a kind of biological treatment system suitable for domestic sewage of villages and small towns, including the water inlet for passing through separator lined
Regulating reservoir 1, aerobic Ith area 3 and aerobic IIth area 4, anaerobic selection area 8 and the functional areas of anoxic zone 12 5.Wherein, water inlet regulating reservoir 1
Adjacent with aerobic Ith area 3, aerobic IIth area 4 and anaerobic selection area 8, anoxic zone 12 is located at aerobic Ith area 3, aerobic IIth area 4 and detested
Oxygen selects the avris of area 8.Five functional areas are interconnected, wherein, water inlet regulating reservoir 1 returns mud pipeline 5 and anaerobic selection by bottom of pond
Area 8, aerobic IIth area 4 are sequentially communicated, wherein, sewage pump 2 is provided with water inlet regulating reservoir 1, sewage pump 2 passes through connecting tube
It is communicated to anaerobic selection area 8 with negative pressure proportioner 7 to be connected, negative pressure proportioner 7 returns mud pipeline 5 by bottom of pond and connected
To the aerobic bottom of pond of IIth area 4.The aerobic top of IIth area 4 is provided with the outlet pipe 13 led at the top of biological treatment system；Anaerobic selection area 8
→ anoxic zone 12 → aerobic Ith area 3 divider height is reduced successively, is connected between aerobic Ith area 3 and aerobic IIth area 4 by water hole 14；
Or aerobic Ith area 3, aerobic IIth area 4, anaerobic selection area 8 and anoxic zone 12 are connected by overflow or perforate.
Aerobic Ith area 3 is L-type, and aerobic IIth area 4 is trapped among in its frame, and aerobic IIth area 4 is inverted pyramidal structures, and bottom of pond returns mud
Pipeline 5 is communicated to the aerobic bottom of pond of IIth area 4.The aerator 6 in array distribution is equipped with aerobic Ith area 3, aerobic IIth area 4.Aerobic II
Mixed liquor stripping tube 9 is distributed with the top of area 4, and mixed-liquor return gas is carried to anoxic zone 12 by aerobic IIth area 4；Anaerobic selection area 8
Denitrification stripping tube 11 is provided with the sides adjacent of anoxic zone 12, denitrifying carbon source gas is carried to anoxic zone 12 by anaerobic selection area 8.
The aerator 6 in array distribution is provided with anaerobic selection area 8, in the side anaerobic selection area 8 close to anoxic zone 12
In be provided with denitrifying carbon source tracheae 11.The aerator 6 in array distribution is provided with anoxic zone 12, between anaerobic selection area 8
Provided with Liquid level flap valve 10.Water hole 14 is provided between aerobic Ith area 3 and aerobic IIth area 4.
The system regulation lifting pond, new and improved type CASS biochemical reaction tanks, sludge recirculation system, interior return-flow system,
From drainage system, each cell compartment of biochemical reaction tank realizes anaerobism, anoxic, aerobic subregion, and each reaction zone is real by high-order linker
The plug-flow recurrent state of existing mixed liquor, realizes decarburization, dephosphorization, the function of nitration denitrification, realizes the purified treatment of sewage, entirely
Processing system only has lifting water pump and the main sewage disposal device of Aeration fan two, therefore operation control is simple, operating cost
It is very low, under equal disposal ability, it can reach less than the 1/3 of existing rural sewage treatment facility operation expense.
The system is CASS improved process, and intermittent water inflow draining, the delivery port of water inlet regulating reservoir connects a negative pressure ratio
Blender, sludge reflux when realizing water inlet；When condition does not allow, sludge reflux pump returned sludge, inlet pipeline end are considered further that
End must have the measure for preventing that siphon from flowing backwards.
When system uses blast aeration, three functional areas (aerobic Ith area+aerobic IIth area, anaerobic selection area, anoxic zone) bottoms
Aerator is respectively mounted, aeration quantity increases successively, the aerobic more aerobic Ith area aeration quantity in IIth area reduces.Wherein selection area and anoxic zone exposes
Airway dysfunction is agitating function, and aeration intensity is minimum, 2~4m3/ (m2*h), wherein anoxic zone aeration intensity gets the small value, and anoxic pond exposes
Gas intensity takes large values；Aerobic zone aeration intensity selects suitable aeration intensity according to pollutant burden and functional areas segmentation, it is ensured that
It is preferably minimized in the state of micro- ratio is eaten when section there is provided enough oxygen-supplying amounts, end aeration quantity, dissolved oxygen concentration is not higher than 4mg/
L。
Waste water pulling flow type is allowed to flow through three functional areas, interconnected forming material is followed again in the stage of reaction for three functional areas
Ring.Necessary mixed effect had both been realized in guarantee, it is often more important that the redox environment formed needed for each functional areas, beneficial to de-
Nitrogen dephosphorization and the removal of organic matter.
According to the concentration and the design removal ability of each cell compartment for entering water pollutant, it is considered to whether increase life in each reaction zone
Thing filler, is conducive to the disposal ability and impact resistance and treatment effect of raising system.
System determines whether to need after operation a period of time according to the MLSS concentration (or SV) of the yield of sludge and mixed liquor
Spoil disposal is carried out, acclimatization thickened sludge is excluded using sludge pump is set in aerobic IIth area, or select other feasible patterns regular
Excess sludge is excluded, to ensure mixed liquor sludge concentration in rational scope.
If water outlet requires that water quality one-level A is below the mark, subsequently into artificial wet land system, biochemistry pool intermittent duty draining
The characteristics of, wetland is in continuously alternation of wetting and drying cyclic process, be conducive to preferably playing artificial wetland treatment system
The disposal ability and raising treatment effeciency of system.
The utility model sewage disposal system in order to ensure the stage of reaction realize between anoxic and anaerobism backflow balance,
The Liquid level flap valve of one one-way flow of partition wall bottom design between anaerobic selection area and the cell compartment of anoxic zone two is (or unidirectional
Valve), only allow mixed liquor to be stayed because of liquid level difference from bottom into anaerobic pond, balance liquid level, form local small backflow.Between each area of system
Divider height can also be equally high, but water intercommunicating pore or communicating pipe were stayed, bottom hole absolute altitude is reduced successively, beneficial to current from the beginning
Hold terminad.
Another feature of the present utility model is, in order to ensure the Effec-tive Function of system and improve automatically controlling for system
Level, less on-line automatic control node is with feeding back, it is necessary to realize preferable system conditions and effluent quality, and water inlet is adjusted
Wear the liquid level regulator of feedback in section pond；The start and stop of aerator passage time relay and liquid level regulator coordinated signals blower fan；
Provided with the dissolved oxygen on-line computing model for measuring water-soluble oxygen in aerobic IIth area.It is online using time controller, automatic control feedback process, dissolved oxygen
Monitoring etc. high standard automatic control and on-line monitoring system, it is ensured that system more effectively realize it is unattended, while ensure system
Operate under preferably operating mode.
Each stage running mode can be performed as follows：
A. water inlet bleeding stage (as shown in Figure 2)：Wherein arrow direction is band "+" table before water (flow) direction, curved arrow
Show that band "-" represents middle part or bottom connection water outlet before its upper top water outlet, curved arrow；Circle represents the arrangement of aerator in figure,
Different arrangement density represents the curved gas intensity of different exposures.
Shown in Fig. 5, give and fill phase is shown in the structural representation of negative pressure proportioner 7, figure, the mixing of negative pressure ratio
Device sludge reflux situation.
When adjusting pit level arrival highest liquid level, water pump automatic start, sludge is synchronously back to anaerobic selection pond, carries out
Anaerobic phosphorus release process, while under many cell compartments and the design of special communicating pipe, the supernatant after precipitation changes gear out reactor, system
It is synchronous.Flooding time is controlled in 1~2h.
B. aerated reaction stage (as shown in Figure 3)：Robot control system(RCS) blower fan automatic start after water inlet end, it is anti-into aeration
Should, anaerobism, anoxic, aerobic reaction cell compartment are formed, C, N, P is removed.Recharge system using air lift, Aerobic Pond end nitrification liquid with
Selection area's sewage raw water is back to anoxic pond leading portion according to design discharge and carries out anti-nitration reaction and poly- phosphorus reaction simultaneously.System exists
The big backflow and local small backflow of the full pond body of reactor are realized under two backflow effects, is conducive to dephosphorization, nitration denitrification, takes off
Efficient, the high-level progress of carbon, while decreasing the oxygen demand demand of system.This phases-time is controlled in 2~3h, gas-water ratio
5~7 (water presses elevator pump flowmeter).
C. the heavy mud stage (as shown in Figure 4) is stood：After the completion of the stage of reaction, the aerated reaction under the control of time controller
Stage terminates, and sludge flco starts to sink, mud-water separation.This phases-time is controlled in 1~1.5h.
D. leave unused the stage：This period before water inlet starts next time is completed in the heavy mud stage, is standby time, and it is not busy
The time of putting should be that the operation reserve of system is adjusted flexibly there is provided may not less than the time for standing the heavy mud stage.
General principle of the present utility model, principal character and advantage of the present utility model has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the utility model is not restricted to the described embodiments, and described in above-listed and specification is
Illustrate principle of the present utility model, on the premise of the utility model spirit and scope are not departed from, the utility model also has respectively
Changes and improvements are planted, these changes and improvements are both fallen within the range of claimed the utility model.The utility model is claimed
Scope is by appended claims and its equivalent thereof.
Claims (10)
1. a kind of biological treatment system suitable for domestic sewage of villages and small towns, it is characterised in that：Including the water inlet by separator lined
Regulating reservoir (1), aerobic Ith area (3) and aerobic IIth area (4), anaerobic selection area (8) and the functional areas of anoxic zone (12) five, it is described
Intake regulating reservoir (1) and aerobic Ith area (3), aerobic IIth area (4) and anaerobic selection area (8) it is adjacent, anoxic zone (12) are positioned at aerobic
Ith area (3), aerobic IIth area (4) and anaerobic selection area (8) avris；Five functional areas are interconnected, wherein, water inlet regulating reservoir (1)
It is sequentially communicated by pipeline with anaerobic selection area (8), aerobic IIth area (4), is provided with above aerobic IIth area (4) and leads to biological treatment
The outlet pipe (13) of system head；Aerobic Ith area (3), aerobic IIth area (4), anaerobic selection area (8) and anoxic zone (12), which pass through, overflows
Stream or perforate connection.
2. a kind of biological treatment system suitable for domestic sewage of villages and small towns according to claim 1, it is characterised in that：It is described
Intake and sewage pump (2) be provided with regulating reservoir (1), sewage pump (2) by connecting tube be communicated to anaerobic selection area (8) with
Negative pressure proportioner (7) is connected, and negative pressure proportioner (7) returns mud pipeline (5) by bottom of pond and is communicated to aerobic IIth area
(4)。
3. a kind of biological treatment system suitable for domestic sewage of villages and small towns according to claim 2, it is characterised in that：It is described
Aerobic Ith area (3) is L-type, and aerobic IIth area (4) is trapped among in its frame；Aerobic IIth area (4) is inverted pyramidal structures, and bottom of pond returns mud pipe
Line (5) is communicated to aerobic IIth area (4) bottom of pond.
4. a kind of biological treatment system suitable for domestic sewage of villages and small towns according to claim 3, it is characterised in that：It is described
Mixed liquor stripping tube (9) is distributed with aerobic IIth area (4) top.
5. a kind of biological treatment system suitable for domestic sewage of villages and small towns according to claim 1, it is characterised in that：It is described
Aerobic Ith area (3), aerobic IIth area (4), anaerobic selection area (8) and anoxic zone (12) interior aerator being equipped with array distribution
(6)。
6. a kind of biological treatment system suitable for domestic sewage of villages and small towns according to claim 1, it is characterised in that：It is described
Anaerobic selection area (8) is provided with denitrification stripping tube (11) with anoxic zone (12) sides adjacent.
7. a kind of biological treatment system suitable for domestic sewage of villages and small towns according to claim 1, it is characterised in that：It is described
Liquid level flap valve (10) is provided between anoxic zone (12) and anaerobic selection area (8).
8. a kind of biological treatment system suitable for domestic sewage of villages and small towns according to claim 1, it is characterised in that：Institute
State and connected between aerobic Ith area (3) and aerobic IIth area (4) by water hole (14)；Anaerobic selection area (8) → anoxic zone (12) → good
The area of oxygen I (3) divider height is reduced successively.
9. a kind of biological treatment system suitable for domestic sewage of villages and small towns according to claim 1, it is characterised in that：It is described
Adding in aerobic Ith area (3) and aerobic IIth area (4), anaerobic selection area (8) and anoxic zone (12) has biologic packing material.
10. a kind of biological treatment system suitable for domestic sewage of villages and small towns according to claim 5, it is characterised in that：Institute
State into water regulating reservoir (1) and be furnished with liquid level regulator；Aerator (6) the passage time relay and liquid level regulator coordinated signals
The start and stop of blower fan；Provided with the dissolved oxygen on-line computing model for measuring water-soluble oxygen in aerobic IIth area (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621438832.2U CN206447641U (en) | 2016-12-26 | 2016-12-26 | A kind of biological treatment system suitable for domestic sewage of villages and small towns |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621438832.2U CN206447641U (en) | 2016-12-26 | 2016-12-26 | A kind of biological treatment system suitable for domestic sewage of villages and small towns |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109095714A (en) * | 2018-08-29 | 2018-12-28 | 李磊 | A kind of good anaerobism alternative expression sewage purifier and purification process |
| CN109231708A (en) * | 2018-11-06 | 2019-01-18 | 北京城市排水集团有限责任公司 | A kind of distributing residents integrated sewage treating apparatus and its application method |
| CN110240365A (en) * | 2019-07-18 | 2019-09-17 | 四川恒泰环境技术有限责任公司 | A kind of coal chemical industry high concentration wastewater treatment system and its method |
| CN114804333A (en) * | 2022-03-15 | 2022-07-29 | 中国环境科学研究院 | Biological rotating disc device and sewage treatment system and method comprising same |
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2016
- 2016-12-26 CN CN201621438832.2U patent/CN206447641U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109095714A (en) * | 2018-08-29 | 2018-12-28 | 李磊 | A kind of good anaerobism alternative expression sewage purifier and purification process |
| CN109231708A (en) * | 2018-11-06 | 2019-01-18 | 北京城市排水集团有限责任公司 | A kind of distributing residents integrated sewage treating apparatus and its application method |
| CN110240365A (en) * | 2019-07-18 | 2019-09-17 | 四川恒泰环境技术有限责任公司 | A kind of coal chemical industry high concentration wastewater treatment system and its method |
| CN114804333A (en) * | 2022-03-15 | 2022-07-29 | 中国环境科学研究院 | Biological rotating disc device and sewage treatment system and method comprising same |
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