CN110372155A - A kind of sewage plant - Google Patents
A kind of sewage plant Download PDFInfo
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- CN110372155A CN110372155A CN201910723267.6A CN201910723267A CN110372155A CN 110372155 A CN110372155 A CN 110372155A CN 201910723267 A CN201910723267 A CN 201910723267A CN 110372155 A CN110372155 A CN 110372155A
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- Prior art keywords
- flow
- sludge
- sewage plant
- secondary settling
- sewage
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- 239000010865 sewage Substances 0.000 title claims abstract description 95
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 102
- 239000010802 sludge Substances 0.000 claims description 83
- 238000010992 reflux Methods 0.000 claims description 47
- 239000007788 liquid Substances 0.000 claims description 45
- 238000011068 loading method Methods 0.000 claims description 16
- 238000005273 aeration Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 238000012806 monitoring device Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 241000196324 Embryophyta Species 0.000 description 40
- 238000005086 pumping Methods 0.000 description 6
- 241000209094 Oryza Species 0.000 description 4
- 235000007164 Oryza sativa Nutrition 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 235000009566 rice Nutrition 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention discloses a kind of sewage plants.The sewage plant includes the pretreatment unit (1) and biological processing unit set gradually, the biological processing unit includes: the anaerobic pond (21) being sequentially communicated, anoxic pond (22), aerobic tank (23) and secondary settling tank (7), through the pretreatment unit (1) treated pretreating sewage, by multipoint water feeding channel (5), it is passed through anaerobic pond (21) in a controlled manner, anoxic pond (22) and aerobic tank (23), the sewage plant has dry season operational mode and rainy season operational mode, under dry season operational mode, through the pretreatment unit (1) treated pretreating sewage, anaerobic pond is only passed through by multipoint water feeding channel；Under rainy season operational mode, through the pretreatment unit treated pretreating sewage, it is passed through anaerobic pond, anoxic pond and aerobic tank simultaneously by multipoint water feeding channel.
Description
Technical field
The present invention relates to technical field of sewage, more particularly to a kind of sewage plant.
Background technique
In recent years, the wastewater treatment rate in many cities in China greatly improves, but urban water environmental quality does not have on the whole
It is obviously improved.For example, Beijing city wastewater treatment rate from the 20% of the nineties be increased to 2009 94%, but from " Beijing
Water resource bulletin " water quality data announced sees that the pollution problem of urban rivers and lakes water body is not solved, water quality compared with
The water body proportion of difference even has raised trend.
Referring to Fig. 1, in the prior art, sewage plant only has a kind of operational mode, for rainy season (usually summer,
Such as annual 5-10 month) and the same operational mode of dry season (such as winter) use.That is, when designing sewage plant,
Only consider dry-weather discharge peak value.And a large amount of rainfalls in rainy season are not accounted for.In rainfall, sewage plant is directly logical
Overflow manner is crossed to solve the water more than dry-weather discharge peak value.
To which initial rainwater becomes the important pollution sources of water body.The Initial Runoff that initial rainwater is formed washes away river, pipe network
And a large amount of pollutants are carried, concentration is similar to the influent quality of municipal wastewater treatment plant, and certain index concentration are even more than dry season
Influent quality.The water more than dry-weather discharge peak value is solved in an overflow manner or is abandoned the processing to initial rainwater and is directly arranged
Enter water body (river, lake etc.), can water pollution be aggravated.In addition, if the rainy season peak flow of big flow directly impacts
Sludge in biological processing unit (such as anaerobic pond, aerobic tank, secondary settling tank etc.) meeting serious disturbance biological processing unit, influences to give birth to
The treatment effect of object processing system.
Summary of the invention
The purpose of the present invention is to provide a kind of sewage plants to overcome or at least mitigate in the drawbacks described above of the prior art
At least one.
To achieve the above object, the present invention provides a kind of sewage plant (also referred to as sewage treatment plant), and the sewage plant includes
It is sequentially communicated the pretreatment unit, biological processing unit and secondary settling tank of setting, the biological processing unit includes: to be sequentially communicated
Anaerobic pond, anoxic pond, aerobic tank, through the pretreatment unit treated pretreating sewage, by multipoint water feeding channel, with by
Prosecutor formula is passed through anaerobic pond, anoxic pond and/or aerobic tank,
The sewage plant further includes mixed liquor return flow line, the mixed liquor return flow line connection aerobic tank and anoxic pond,
For the mixed liquor in aerobic tank to be back to anoxic pond, the mixed liquor return flow line is provided with mixed liquor reflux pump, described
Mixed liquor reflux pump be controllable adjustment pump, controllable adjustment pump refer to flow can controlled adjustment pump.The mixed liquor reflux pump energy
Pumping force is enough provided, the pumping of mixed liquor is realized or promote.
The sewage plant further includes sludge reflux channel, and the sludge reflux channel connection secondary settling tank and anaerobic pond are used for
By the sludge reflux in secondary settling tank to anaerobic pond, the sludge reflux channel is provided with sludge reflux pump, the sludge reflux pump
For controllable adjustment pump.The sludge reflux pump is capable of providing pumping force, realizes or promote the pumping of sludge.
The sewage plant has dry season operational mode and rainy season operational mode, the dry season peak value stream under dry season operational mode
Measuring V1=K1*V0, the rainy season peak flow V2=K2*V0 under rainy season operational mode, wherein V0 is annual flow of inlet water,
K1 and K2 is setting coefficient, and K2 > K1,
Maximum pumpability P1 >=max of the mixed liquor reflux pump, wherein max is maximizing function, and m1 is drought
Season return current ratio of the mixed liquid, m2 be rainy season return current ratio of the mixed liquid,
Maximum pumpability P2 >=max of the sludge reflux pump, wherein n1 is dry season return sludge ratio, and n2 is rainy season
Return sludge ratio, n1 > n2,
Under dry season operational mode, through the pretreatment unit treated pretreating sewage, by multipoint water feeding channel
Only it is passed through anaerobic pond；
Under rainy season operational mode, through the pretreatment unit treated pretreating sewage, by multipoint water feeding channel
It is passed through anaerobic pond, anoxic pond and aerobic tank simultaneously.
Preferably, dry season return current ratio of the mixed liquid m1 value in the range of 250-400%；
Rainy season return current ratio of the mixed liquid m2 value in the range of 100-250%, in flow of inlet water >=85%*V2, mixing
Liquid reflux ratio n2 reflux ratio is arranged in the range of 100%-150%；
Dry season return sludge ratio n1 value in the range of 100-200%；
Rainy season return sludge ratio n2 value in the range of 50-100%, in flow of inlet water >=85%*V2, sludge is returned
Stream is arranged in the range of 55%-65% than n2.For example, return sludge ratio n2 is set as in flow of inlet water >=85%*V2
60%.
Preferably, in the real-time flow of inlet water of the sewage plant >=80%*V2, or in the real-time of the sewage plant
When flow of inlet water >=V1, through the pretreatment unit treated pretreating sewage, it is passed through and detests simultaneously by multipoint water feeding channel
Oxygen pond, anoxic pond and aerobic tank, wherein the water accounting into anaerobic pond is 10-30%, into the water accounting of anoxic pond
30-50%, the water accounting into aerobic tank are 40%.
Preferably, the upstream of the pretreatment unit is provided with liquid level or flow monitoring device, when the liquid level or stream
When the liquid level or flow rising that amount monitoring device monitors meet or exceed given threshold, pass through sewage plant alarm and control system
Return current ratio of the mixed liquid, the return sludge ratio of automatic or manual change sewage plant.
Preferably, aerating system supplies aerobic tank in such a way that air mass flow is adjustable, is more than drought in flow of inlet water
After reaching setting duration season peak flow V1, the air demand to aerobic tank is reduced.
Preferably, under dry season operational mode, the mixed liquid concentration MLSS of aerobic tank2Using 3-4g/L；
Under rainy season operational mode, the mixed liquid concentration MLSS of aerobic tank1Using 2-3g/L；
Flow of inlet water be more than dry season peak flow V1 reach setting duration after, the mixed liquor under dry season operational mode is dense
Spend MLSS2Adopt the mixed liquid concentration switched under rainy season operational mode.
Preferably, secondary settling tank surface loading is designed using dry-weather discharge surface loading, using wet-weather flow surface loading school
Core.
Preferably, the surface area S of secondary settling tank is calculated with following methods:
S=max (S1, S2)
Max is to be maximized function
S1=V1/Q1, V1 is winter peak flow, Q1Hydraulic surface loading when for winter operation,
S2=V2/Q2, V2 is summer peak flow, Q2Hydraulic surface loading when for summer operation,
Q1=C*H*SQRT (SS)/(MLSS1*SVI1*(1+R1))
Q2=C*H*SQRT (SS)/(MLSS2*SVI2*(1+R2))
Wherein,
C is the constant of setting, and the value of C is arranged in the range of 51.5-61.5,
H is to preset the secondary settling tank depth of water, H > 3.5 meter,
MLSS1Aeration tank sludge concentration when for winter operation,
SQRT indicates extraction of square root function,
SS is the concentration of suspended particles requirement of the water outlet to secondary settling tank,
SVI1Sludge volume index when for winter operation,
R1Return sludge ratio when for winter operation, R1In the range of 100%-200%,
MLSS2Aeration tank sludge concentration when for summer operation, wherein MLSS2<MLSS1
SVI2Sludge volume index when for summer operation,
R2Return sludge ratio when for summer operation, R2In the range of 50%-100%,
Preferably, SVI1=a-b*T1；SVI2=a-b*T2。
A and b be preset constant, a in the range of 210 to 230, b in the range of 5.5 to 5.6,
T1For secondary settling tank winter design and operation minimum temperature；
T2For secondary settling tank summer design and operation minimum temperature.
Preferably, under rainy season operational mode, the rainwater stage (such as refers to, flow of inlet water reaches 80%* for the first time in the early stage
V2), if effluent characteristics are exceeded more than 15%, setting auxiliary secondary settling tank, the auxiliary secondary settling tank is run parallel with secondary settling tank.
Sewage plant of the invention have multipoint water feeding channel, the multipoint water feeding channel be passed through in a controlled manner anaerobic pond,
Anoxic pond and aerobic tank, so as to which water inlet is selectively imported anaerobic pond, anoxic pond and aerobic tank；Also, it is of the invention
Sludge reflux pump and mixed liquor reflux pump in sewage plant are controllable adjustment pump, can be arranged according to concrete conditions such as inflows and be pumped
Flow.To which different operating modes can be arranged for dry season and rainy season in sewage plant of the invention, to the initial stage rain in rainy season
Water is effectively handled.
Detailed description of the invention
Fig. 1 is the schematic diagram of the sewage plant of the prior art.
Fig. 2 is the schematic diagram of sewage plant according to an embodiment of the invention.
Appended drawing reference:
| 1 | Pretreatment unit | 21 | Anaerobic pond |
| 3 | Mixed liquor return flow line | 22 | Anoxic pond |
| 4 | Sludge reflux channel | 23 | Aerobic tank |
| 5 | Multipoint water feeding channel | 31 | Mixed liquor reflux pump |
| 6 | Aerating system | 41 | Sludge reflux pump |
| 7 | Secondary settling tank | 61 | Air valve |
Specific embodiment
In the accompanying drawings, same or similar element is indicated using same or similar label or there is same or like function
Element.The embodiment of the present invention is described in detail with reference to the accompanying drawing.
In the description of the present invention, term " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" "inner", "outside" is that orientation based on the figure or position are closed
System, is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have
Specific orientation is constructed and operated in a specific orientation, therefore should not be understood as limiting the scope of the invention.
Referring to fig. 2, the sewage plant of the embodiment of the present invention includes the pretreatment unit 1 for being sequentially communicated setting, biological treatment list
Member and secondary settling tank 7.That is, the upstream of biological processing unit, the biology that secondary settling tank 7 is arranged in is arranged in pretreatment unit 1
Processing unit downstream.
The biological processing unit includes the anaerobic pond 21 being sequentially communicated, anoxic pond 22 and aerobic tank 23.To from pre-
The sewage of processing unit 1 can be followed by anaerobic pond 21, anoxic pond 22, aerobic tank 23.The water outlet downstream of secondary settling tank can be into
Advanced treatment unit is arranged in one step, carries out advanced treating so as to the water outlet to secondary settling tank, further increases the place of sewage plant
Rationality energy.
Pretreatment unit 1 is for example including coarse rack, Boosting pumping station, fine fack, setting pot, the primary sedimentation tank etc. set gradually.
It is passed through in a controlled manner through the pretreatment unit 1 treated pretreating sewage by multipoint water feeding channel 5
Anaerobic pond 21, anoxic pond 22 and/or aerobic tank 23.For example, controlled according to the situation of change of inflow multipoint water feeding channel 5 to
The water supply of anaerobic pond 21, anoxic pond 22, aerobic tank 23.In dry season, multipoint water feeding channel 5 is usually arranged as only supplying to anaerobic pond 2
Water.
The entrance in multipoint water feeding channel 5 is connect with the outlet of pretreatment unit 1.There are three outlets for the tool of multipoint water feeding channel 5
Channel, three exit passageways are respectively communicated with anaerobic pond 21, anoxic pond 22, aerobic tank 23.In one embodiment, it is exported at three
Controllable channel valve is both provided on channel.To by multipoint water feeding channel 5, in a controlled manner to anaerobic pond 21, anoxic pond
22 and aerobic tank 23 be selectively passed through sewage.
Biological processing unit uses A2/ O technology.Each section can be set in anaerobic pond, anoxic pond and aerobic tank
Count into the formula of being thoroughly mixed, pulling flow type or combined type.Nitrification mixed liquor is back to anoxic pond from aerobic tank end and carries out denitrification, mixes
Liquid reflux ratio is closed to be set as needed.Returned sludge enters anaerobic pond, and return sludge ratio is set as needed.
Tertiary treatment can be set in the downstream of secondary settling tank, tertiary treatment is advanced treating, for example, by using coagulation, filtering etc.
Technique.
Pretreatment unit 1, biochemical treatment unit, secondary settling tank and/or subsequent advanced treatment unit are according to dry season peak value
Flow and the setting of rainy season peak flow, while meeting the requirement of dry season peak flow and rainy season peak flow.Rather than as right
More such than technology, pretreatment unit 1 and/or subsequent advanced treatment unit are arranged according to dry season peak flow；Biochemical treatment
Unit, secondary settling tank are designed using mean annual discharge.To substantially increase the entirety ability of entire sewage plant.It eliminates
Biochemical treatment unit, secondary settling tank bring handle bottleneck.
The sewage plant further includes mixed liquor return flow line 3, and the mixed liquor return flow line 3 is connected to aerobic tank 23 and anoxic
Pond 22, for the mixed liquor in aerobic tank 23 to be back to anoxic pond 22, the mixed liquor return flow line 3 is provided with mixed liquor and returns
Stream pump 31, the mixed liquor reflux pump 31 are controllable adjustment pump.Controllable adjustment pump refer to flow can controlled adjustment pump.For example,
The flow or pumping power of the controllable adjustment pump can be adjusted according to instructing or controlling signal.Mixed liquor channel 4 can adopt
With any structure type appropriate, but its through-current capability needs to meet the requirement of mixed liquor maximum reflux capability.
The sewage plant further includes sludge reflux channel 4, and the sludge reflux channel 4 is connected to secondary settling tank 7 and anaerobic pond 21,
For by the sludge reflux in secondary settling tank 7 to anaerobic pond 21, the sludge reflux channel 4 to be provided with sludge reflux pump 41, described
Sludge reflux pump 41 is controllable adjustment pump.Sludge reflux channel 4 can use any structure type appropriate, but its through-flow energy
Power needs to meet the requirement of sludge maximum reflux capability.
The sewage plant has dry season (such as winter) operational mode and rainy season (such as summer) operational mode.It is transported in dry season
Dry season peak flow V1=K1*V0 under row mode, the rainy season peak flow V2=K2*V0 under rainy season operational mode, wherein
V0 is annual flow of inlet water, and K1 and K2 are setting coefficient, and K2 > K1.Dry season peak flow V1 predominantly passes through sewage network
The peak flow of sanitary sewage, medical sewage, the production waste of discharge etc..Rainy season peak flow V2 is in addition to including artificially generated
It further include the sewage (rainwater for flowing into sewage network) that rainfall generates except sewage.K1 and K2 is according to sewage plant region
Sewage situation and rain fall and sewage treatment capacity requirement etc. determine.For example, K1 is 1.5；K2 is 3.
Annual flow of inlet water is, for example, the design year processing capacity of sewage plant, and unit is, for example, ton/year.Dry season peak value stream
Amount refers to 80% quantile of all flows, and unit is, for example, m3/h.Rainy season peak flow refers to 95% quartile of all flows
Number, unit is, for example, m3/h。
It is understood that each workshop section's processing water and pipe diameter etc. are adapted to rainy season peak flow V2.
The maximum pumpability P1 of the mixed liquor reflux pump 31 >=max (m1*V1, m2*V2), wherein max is to ask most
Big value function, m1 are dry season return current ratio of the mixed liquid, and m2 is rainy season return current ratio of the mixed liquid, usual dry season return current ratio of the mixed liquid and rainy season
Return current ratio of the mixed liquid is set as different values.Usual m1 > m2.
The maximum pumpability P2 of the sludge reflux pump 41 >=max (n1*V1, n2*V2), wherein n1 is dry season sludge
Reflux ratio, n2 are rainy season return sludge ratio, n1 > n2.
Under dry season operational mode, through the pretreatment unit 1 treated pretreating sewage, by multipoint water feeding channel
5 are only passed through anaerobic pond 21；
Under rainy season operational mode, through the pretreatment unit 1 treated pretreating sewage, by multipoint water feeding channel
5 are passed through anaerobic pond 21, anoxic pond 22 and aerobic tank 23 simultaneously.
Sewage plant of the invention have multipoint water feeding channel, the multipoint water feeding channel be passed through in a controlled manner anaerobic pond,
Anoxic pond and aerobic tank, so as to which water inlet is selectively imported anaerobic pond, anoxic pond and aerobic tank；Also, it is of the invention
Sludge reflux pump and mixed liquor reflux pump in sewage plant are controllable adjustment pump, can be arranged according to concrete conditions such as inflows and be pumped
Flow.To which different operating modes can be arranged for dry season and rainy season in sewage plant of the invention, to the initial stage rain in rainy season
Water is effectively handled.
Inventors have seen that: as the rainy season in annual 5-10 month arrives, the water into sewage plant is obvious
Increase, various pollutants concentration is generally diluted.In several weeks that rainfall starts, concentration of wastewater starts to be increased (to being deposited on
Pollutant in sewage pipe washes away), subsequent several months pollutant concentration has different degrees of reduction (to reduce amplitude in 30-50%
Left and right).Previous sewage plant do not account for this part impact water and cause that a large amount of rain sewage are measured and handled without sewage plant and
Direct outlet causes environmental pollution.
Sewage plant of the invention after rainwater, switches to rainy season operational mode in the early stage, to adapt to rainy season big flow, pollution
The characteristics of object concentration is diluted.
The value of dry season return current ratio of the mixed liquid m1 and rainy season return current ratio of the mixed liquid m2 can according to need setting.Implement at one
In example, dry season return current ratio of the mixed liquid m1 value in the range of 250-400%.Rainy season, return current ratio of the mixed liquid m2 was in 100-250%
In the range of value, in flow of inlet water >=85%*V2, the model of 100%-150% is arranged in return current ratio of the mixed liquid n2 reflux ratio
In enclosing.
The value of dry season return sludge ratio n1 and rainy season return sludge ratio n2 can according to need setting.In one embodiment
In, dry season return sludge ratio n1 value in the range of 100-200%；Rainy season, return sludge ratio n2 was in the range of 50-100%
Value, in flow of inlet water >=85%*V2, return sludge ratio n2 is arranged in the range of 55%-65%.For example, in feed water flow
When amount >=85%*V2, return sludge ratio n2 is set as 60%.
In one embodiment, in the real-time flow of inlet water of the sewage plant >=80%*V2, or in the sewage
When the real-time flow of inlet water of factory >=V1, through the pretreatment unit 1 treated pretreating sewage, by multipoint water feeding channel 5
It is passed through anaerobic pond 21, anoxic pond 22 and aerobic tank 23 simultaneously, wherein the water accounting into anaerobic pond 21 is 10-30%, is entered
The water accounting 30-50% of anoxic pond 22, the water accounting into aerobic tank 23 are 40%.To which suitably distribution enters life
The sewage of object processing unit reduces the disturbance to sludge in anaerobic pond 21, anoxic pond 22 and aerobic tank 23.Improve biological treatment list
The process performance of member.
In order to carry out flow monitoring or rainfall monitoring preferably, the upstream of the pretreatment unit 1 be provided with liquid level or
Flow monitoring device.Liquid level or the flow rising monitored when the liquid level or flow monitoring device meets or exceeds given threshold
When, change return current ratio of the mixed liquid, the return sludge ratio of sewage plant by sewage plant alarm and control system automatic or manual.Sewage
Factory's alarm and control system can be a component part of the general control system of entire sewage plant, or be integrated in entire sewage
In the general control system of factory.
Aerating system 6 supplies aerobic tank 23 in such a way that air mass flow is adjustable, is more than dry season peak in flow of inlet water
Value flow V1 reaches setting duration (such as 3 hours, 6 hours；Perhaps had reached in 3 days 12 hours or
24 hours) after, the air demand to aerobic tank 23 is reduced, decrement blowing model is switched to.In the illustrated embodiment, aeration system
System 8 supplies aerobic tank 23 by three supply air lines with air valve 61.In the normal mode of operation, three supply air lines
It opens simultaneously, aerobic tank 23 is supplied.In the case where being reduced blowing model, two or a supply air line are only opened, to aerobic tank
23 gas supply.Advantageously, the air valve 61 on three supply air lines is solenoid valve.In an alternative embodiment, three electricity
Two in magnet valve are simple switch valve, and the switch valve only has standard-sized sheet and fully closed two states.In three solenoid valves
Another is proportioning valve, and the opening degree of the proportioning valve is controllable.Thus, it is possible to according to flow of inlet water, water inlet ingredient,
Temperature etc. is because usually adjusting aerating system 8 to the practical air demand of aerobic tank 23.
The mixed liquid concentration of aerobic tank 23 can according to need setting.Advantageously, being transported in rainy season operational mode and dry season
Different mixed liquid concentrations is set under row mode.Under rainy season operational mode, using lower mixed liquid concentration.Implement at one
In example, under rainy season operational mode, the mixed liquid concentration MLSS of aerobic tank 231Using 2-3g/L；It is good under dry season operational mode
The mixed liquid concentration MLSS in oxygen pond 232Using 3-4g/L.It in one embodiment, is more than dry season peak flow V1 in flow of inlet water
After reaching setting duration, by the mixed liquid concentration MLSS under dry season operational mode2Adopt the mixing switched under rainy season operational mode
Liquid concentration.
In order to cope with rainy season peak flow, the secondary settling tank of sewage plant needs to have suitable processing capacity.Implement at one
In example, secondary settling tank surface loading is designed using dry-weather discharge surface loading, is checked using wet-weather flow surface loading.
Specifically, the surface area S of secondary settling tank is calculated with following methods:
S=max (S1, S2)
Max is to be maximized function
S1=V1/Q1, V1 is winter peak flow, Q1Hydraulic surface loading when for winter operation,
S2=V2/Q2, V2 is summer peak flow, Q2Hydraulic surface loading when for summer operation,
Q1=C*H*SQRT (SS)/(MLSS1*SVI1*(1+R1))
Q2=C*H*SQRT (SS)/(MLSS2*SVI2*(1+R2))。
Wherein,
C is the constant of setting, and the value of C is arranged in the range of 51.5-61.5,
H is to preset the secondary settling tank depth of water, H >=3.5 meters, for example, 4.0 meters are preset as,
MLSS1Aeration tank sludge concentration when for winter operation,
SQRT indicates extraction of square root function,
SS is the concentration of suspended particles requirement of the water outlet to secondary settling tank,
SVI1Sludge volume index when for winter operation,
R1Return sludge ratio when for winter operation, R1In the range of 100%-200%.
MLSS2Aeration tank sludge concentration when for summer operation, wherein MLSS2<MLSS1, aeration tank when summer operation
Sludge concentration is lower than the aeration tank sludge concentration in winter, thus, more sludge are provided in winter, so that it is lower to be adapted to winter
Sludge activity.In addition, being conducive to mitigate the influence of transient peak flow attack.By make secondary settling tank be discharged sludge, or
Reduce return sludge ratio, aeration tank sludge concentration can be reduced.Sludge is discharged by reducing secondary settling tank, or increases sludge reflux
Than aeration tank sludge concentration can be improved.
SVI2Sludge volume index when for summer operation.
R2Return sludge ratio when for summer operation, R2In the range of 50%-100%.
Preferably, SVI1=a-b*T1；SVI2=a-b*T2。
A and b be preset constant, a in the range of 210 to 230, b in the range of 5.5 to 5.6,
T1For secondary settling tank winter design and operation minimum temperature；
T2For secondary settling tank summer design and operation minimum temperature.
Preferably, under rainy season operational mode, in the early stage the rainwater stage (for example, flow of inlet water reaches 80%*V2 for the first time,
Or more than V1), if effluent characteristics are exceeded more than 15%, setting auxiliary secondary settling tank, the auxiliary secondary settling tank and secondary settling tank are simultaneously
Row operation.
Default secondary settling tank depth of water H can rule of thumb data be determined.The present invention also provides quantizations to determine default secondary settling tank water
The method of deep H.
Specifically, the secondary settling tank design method further comprises determining the initialization step S0 of default secondary settling tank depth of water H.
The initialization step S0 includes:
Step S01: average of the whole year inflow V is determined0(for example, 15000m3/ d=625m3/h)；
Step S02: it is chosen and average of the whole year inflow in the range of 0.60m/h-1.5m/h or 0.60m/h-0.7m/h
The corresponding average surface hydraulic loading Q of V00；(for example, Q0=0.65m/h)
Step S03: it calculates secondary settling tank and estimates surface area S0With diameter D0, for non-circular secondary settling tank, diameter D herein0
For equivalent diameter, also the same calculating,
S0=V0/Q0；(S0=625/0.65=961.5m2)
D0=2*SQRT (S0/π)(D0=35m).
For example, diameter is equivalent diameter for the secondary settling tank of square or rectangle, and calculated using identical method.
Step S04: it is based on following table, chooses and estimate diameter D0It is corresponding to estimate depth of water H0(D0=4.5m), the depth of water will be estimated
H0As default secondary settling tank depth of water H, the calculating of the surface area S for aforementioned secondary settling tank,
| Secondary settling tank diameter | The depth of water |
| 10-19 meters | 3.5 rice |
| 20-30 meters | 4 meters |
| 30-40 meters | 4.5 rice |
| 40 meters or more | 5 meters |
In order to improve the accuracy of calculating, the secondary settling tank design method further comprises the water for checking secondary settling tank depth of water H
Deep to check step step S6, the depth of water checks step S6 and includes:
Step S61: secondary settling tank diameter D is calculated based on surface area design value S, diameter herein also includes equivalent diameter；
Step S62: whether the corresponding relationship for checking secondary settling tank diameter D and the default depth of water H meets following table,
| Secondary settling tank diameter | The depth of water |
| 10-19 meters | 3.5 rice |
| 20-30 meters | 4 meters |
| 30-40 meters | 4.5 rice |
| 40 meters or more | 5 meters |
Step S63: if conditions are not met, default depth of water H is adjusted to corresponding with secondary settling tank diameter D, and it is based on aforementioned side
Method recalculates secondary settling tank surface area S.
Finally it is noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.This
The those of ordinary skill in field is it is understood that be possible to modify the technical solutions described in the foregoing embodiments or right
Part of technical characteristic is equivalently replaced；These are modified or replaceed, and it does not separate the essence of the corresponding technical solution originally
Invent the spirit and scope of each embodiment technical solution.
Claims (10)
1. a kind of sewage plant, which is characterized in that at the sewage plant includes the pretreatment unit (1) for being sequentially communicated setting, is biological
Manage unit and secondary settling tank (7), the biological processing unit includes: the anaerobic pond (21) being sequentially communicated, anoxic pond (22) and aerobic
Pond (23) leads to through the pretreatment unit (1) treated pretreating sewage by multipoint water feeding channel (5) in a controlled manner
Enter anaerobic pond (21), anoxic pond (22) and/or aerobic tank (23),
The sewage plant further includes mixed liquor return flow line (3), and the mixed liquor return flow line (3) is connected to aerobic tank (23) and lacks
Oxygen pond (22), for the mixed liquor in aerobic tank (23) to be back to anoxic pond (22), mixed liquor return flow line (3) setting
Having mixed liquor reflux pump (31), the mixed liquor reflux pump (31) is controllable adjustment pump,
The sewage plant further includes sludge reflux channel (4), sludge reflux channel (4) connection secondary settling tank (7) and anaerobic pond
(21), for by the sludge reflux in secondary settling tank (7) to anaerobic pond (21), the sludge reflux channel (4) to be provided with sludge and returns
Stream pump (41), the sludge reflux pump (41) are controllable adjustment pump,
The sewage plant has dry season operational mode and rainy season operational mode, the dry season peak flow V1 under dry season operational mode
=K1*V0, the rainy season peak flow V2=K2*V0 under rainy season operational mode, wherein V0 be annual flow of inlet water, K1 and
K2 is setting coefficient, and K2 > K1,
The maximum pumpability P1 of the mixed liquor reflux pump (31) >=max (m1*V1, m2*V2), wherein max is to ask maximum
Value function, m1 are dry season return current ratio of the mixed liquid, and m2 is rainy season return current ratio of the mixed liquid,
The maximum pumpability P2 of the sludge reflux pump (41) >=max (n1*V1, n2*V2), wherein n1 returns for dry season sludge
Flow ratio, n2 be rainy season return sludge ratio, n1 > n2,
Under dry season operational mode, through the pretreatment unit (1) treated pretreating sewage, by multipoint water feeding channel
(5) anaerobic pond (21) are only passed through；
Under rainy season operational mode, through the pretreatment unit (1) treated pretreating sewage, by multipoint water feeding channel
(5) it is passed through anaerobic pond (21), anoxic pond (22) and aerobic tank (23) simultaneously.
2. sewage plant as described in claim 1, which is characterized in that
Dry season return current ratio of the mixed liquid m1 value in the range of 250-400%；
Rainy season return current ratio of the mixed liquid m2 value in the range of 100-250%, in flow of inlet water >=85%*V2, mixed liquor is returned
Stream is arranged in the range of 100%-150% than n2 reflux ratio；
Dry season return sludge ratio n1 value in the range of 100-200%；
Rainy season return sludge ratio n2 value in the range of 50-100%, in flow of inlet water >=85%*V2, return sludge ratio
N2 is arranged in the range of 55%-65%.
3. sewage plant as described in claim 1, which is characterized in that
In real-time flow of inlet water >=80%*V2 of the sewage plant, or the sewage plant real-time flow of inlet water >=
When V1, through the pretreatment unit (1) treated pretreating sewage, it is passed through anaerobic pond simultaneously by multipoint water feeding channel (5)
(21), anoxic pond (22) and aerobic tank (23), wherein the water accounting for entering anaerobic pond (21) is 10-30%, into anoxic pond
(22) water accounting 30-50%, the water accounting into aerobic tank (23) are 40%.
4. sewage plant as described in claim 1, which is characterized in that the upstream of the pretreatment unit (1) is provided with liquid level
Or flow monitoring device, the liquid level or flow rising monitored when the liquid level or flow monitoring device meet or exceed setting threshold
When value, change return current ratio of the mixed liquid, the return sludge ratio of sewage plant by sewage plant alarm and control system automatic or manual.
5. sewage plant as described in claim 1, which is characterized in that
Aerating system (6) supplies aerobic tank (23) in such a way that air mass flow is adjustable, is more than dry season peak in flow of inlet water
After value flow V1 reaches setting duration, the air demand to aerobic tank (23) is reduced.
6. sewage plant as claimed in claim 5, which is characterized in that
Under dry season operational mode, the mixed liquid concentration MLSS of aerobic tank (23)2Using 3-4g/L；
Under rainy season operational mode, the mixed liquid concentration MLSS of aerobic tank (23)1Using 2-3g/L；
It is more than after dry season peak flow V1 reaches setting duration, by the mixed liquid concentration under dry season operational mode in flow of inlet water
MLSS2Adopt the mixed liquid concentration switched under rainy season operational mode.
7. sewage plant as described in claim 1, which is characterized in that
Secondary settling tank surface loading is designed using dry-weather discharge surface loading, is checked using wet-weather flow surface loading.
8. such as sewage plant of any of claims 1-7, which is characterized in that
The surface area S of secondary settling tank is calculated with following methods:
S=max (S1, S2)
Max is to be maximized function
S1=V1/Q1, V1 is winter peak flow, Q1Hydraulic surface loading when for winter operation,
S2=V2/Q2, V2 is summer peak flow, Q2Hydraulic surface loading when for summer operation,
Q1=C*H*SQRT (SS)/(MLSS1*SVI1*(1+R1))
Q2=C*H*SQRT (SS)/(MLSS2*SVI2*(1+R2))
Wherein,
C is the constant of setting, and the value of C is arranged in the range of 51.5-61.5,
H is to preset the secondary settling tank depth of water, H > 3.5 meter,
MLSS1Aeration tank sludge concentration when for winter operation,
SQRT indicates extraction of square root function,
SS is the concentration of suspended particles requirement of the water outlet to secondary settling tank,
SVI1Sludge volume index when for winter operation,
R1Return sludge ratio when for winter operation, R1In the range of 100%-200%,
MLSS2Aeration tank sludge concentration when for summer operation, wherein MLSS2<MLSS1
SVI2Sludge volume index when for summer operation,
R2Return sludge ratio when for summer operation, R2In the range of 50%-100%.
9. sewage plant as claimed in claim 8, which is characterized in that
SVI1=a-b*T1
SVI2=a-b*T2
A and b be preset constant, a in the range of 210 to 230, b in the range of 5.5 to 5.6,
T1For secondary settling tank winter design and operation minimum temperature；
T2For secondary settling tank summer design and operation minimum temperature.
10. such as sewage plant of any of claims 1-7, which is characterized in that
Under rainy season operational mode, in the early stage the rainwater stage, if effluent characteristics are exceeded more than 15%, setting assists secondary settling tank,
The auxiliary secondary settling tank is run parallel with secondary settling tank.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117303583A (en) * | 2023-08-28 | 2023-12-29 | 可事托环保设备（上海）有限公司 | Biological denitrification and dephosphorization system with reinforced hydraulic impact resistance and dephosphorization functions |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001000537A1 (en) * | 1999-06-24 | 2001-01-04 | Linfeng Shi | Process and apparatus for treating waste water |
| KR20030047009A (en) * | 2001-12-07 | 2003-06-18 | (주)수엔지니어링 & 컨설팅 | Step-feed intermittent aeration system for carbon, nitrogen, phosphorus removal |
| CN1769213A (en) * | 2005-09-14 | 2006-05-10 | 哈尔滨工业大学 | Water influent allocation optimization method in segmental influent and biological denitrification process |
| KR20080080077A (en) * | 2007-12-28 | 2008-09-02 | 한상관 | Method to purify polluted water or polluted natural objects naturally and method to separate floating matter from that water and method to generate energy using that floating matter |
| CN101570382A (en) * | 2009-06-10 | 2009-11-04 | 北京工业大学 | Device for improving advanced nitrogen and phosphorus removal by step feed and method |
| CN201842731U (en) * | 2010-10-14 | 2011-05-25 | 北京华利嘉环境工程技术有限公司 | Enhanced nitrogen and phosphorus removal sewage treatment system |
| CN102765857A (en) * | 2012-08-06 | 2012-11-07 | 上海电力学院 | Sewage treatment system and application thereof |
| CN103936148A (en) * | 2012-12-28 | 2014-07-23 | 上海中信水务产业有限公司 | Constant-effluent variable-load SVBR sewage processing technology |
| CN104030439A (en) * | 2014-06-05 | 2014-09-10 | 天津市市政工程设计研究院 | Multi-mode operating AAO biological reaction tank |
| CN107585951A (en) * | 2017-09-07 | 2018-01-16 | 上海同济普兰德生物质能股份有限公司 | A kind of method of heavy mud recovery intensified denitrification and dephosphorization |
| CN108996814A (en) * | 2018-07-19 | 2018-12-14 | 江苏澳洋生态园林股份有限公司 | A kind of municipal sewage and rainwater combined treatment process |
| CN109231459A (en) * | 2018-10-29 | 2019-01-18 | 中国市政工程华北设计研究总院有限公司 | It is a kind of for handling the biochemistry pool and its treatment process of rain dirt mixing water |
| CN110368719A (en) * | 2019-08-06 | 2019-10-25 | 詹卫东 | A kind of secondary settling tank design method and corresponding secondary settling tank |
| CN210457859U (en) * | 2019-08-06 | 2020-05-05 | 詹卫东 | Sewage plant |
-
2019
- 2019-08-06 CN CN201910723267.6A patent/CN110372155B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001000537A1 (en) * | 1999-06-24 | 2001-01-04 | Linfeng Shi | Process and apparatus for treating waste water |
| KR20030047009A (en) * | 2001-12-07 | 2003-06-18 | (주)수엔지니어링 & 컨설팅 | Step-feed intermittent aeration system for carbon, nitrogen, phosphorus removal |
| CN1769213A (en) * | 2005-09-14 | 2006-05-10 | 哈尔滨工业大学 | Water influent allocation optimization method in segmental influent and biological denitrification process |
| KR20080080077A (en) * | 2007-12-28 | 2008-09-02 | 한상관 | Method to purify polluted water or polluted natural objects naturally and method to separate floating matter from that water and method to generate energy using that floating matter |
| CN101570382A (en) * | 2009-06-10 | 2009-11-04 | 北京工业大学 | Device for improving advanced nitrogen and phosphorus removal by step feed and method |
| CN201842731U (en) * | 2010-10-14 | 2011-05-25 | 北京华利嘉环境工程技术有限公司 | Enhanced nitrogen and phosphorus removal sewage treatment system |
| CN102765857A (en) * | 2012-08-06 | 2012-11-07 | 上海电力学院 | Sewage treatment system and application thereof |
| CN103936148A (en) * | 2012-12-28 | 2014-07-23 | 上海中信水务产业有限公司 | Constant-effluent variable-load SVBR sewage processing technology |
| CN104030439A (en) * | 2014-06-05 | 2014-09-10 | 天津市市政工程设计研究院 | Multi-mode operating AAO biological reaction tank |
| CN107585951A (en) * | 2017-09-07 | 2018-01-16 | 上海同济普兰德生物质能股份有限公司 | A kind of method of heavy mud recovery intensified denitrification and dephosphorization |
| CN108996814A (en) * | 2018-07-19 | 2018-12-14 | 江苏澳洋生态园林股份有限公司 | A kind of municipal sewage and rainwater combined treatment process |
| CN109231459A (en) * | 2018-10-29 | 2019-01-18 | 中国市政工程华北设计研究总院有限公司 | It is a kind of for handling the biochemistry pool and its treatment process of rain dirt mixing water |
| CN110368719A (en) * | 2019-08-06 | 2019-10-25 | 詹卫东 | A kind of secondary settling tank design method and corresponding secondary settling tank |
| CN210457859U (en) * | 2019-08-06 | 2020-05-05 | 詹卫东 | Sewage plant |
Non-Patent Citations (2)
| Title |
|---|
| DAIGGER, GT等: "Marrying Step Feed with Secondary Clarifier Improvements to Significantly Increase Peak Wet Weather Treatment Capacity: An Integrated Methodology", WATER ENVIRONMENT RESEARCH, vol. 89, no. 8, pages 724 - 731 * |
| 邹玲: "改良型A2/O工艺在雨季运行脱氮的小试研究和模拟分析", 中国优秀硕士学位论文全文数据库工程科技Ⅰ辑, vol. 2015, no. 01, pages 6 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117303583A (en) * | 2023-08-28 | 2023-12-29 | 可事托环保设备（上海）有限公司 | Biological denitrification and dephosphorization system with reinforced hydraulic impact resistance and dephosphorization functions |
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