CN101898827A - Be used for activated sludge process and facility that biological municipal sewage is handled - Google Patents
Be used for activated sludge process and facility that biological municipal sewage is handled Download PDFInfo
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- CN101898827A CN101898827A CN2010101474897A CN201010147489A CN101898827A CN 101898827 A CN101898827 A CN 101898827A CN 2010101474897 A CN2010101474897 A CN 2010101474897A CN 201010147489 A CN201010147489 A CN 201010147489A CN 101898827 A CN101898827 A CN 101898827A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a kind of activated sludge process that biological municipal sewage is handled that is used for, processing by three phases and second pond, make the sewage after the processing reach emission standard, its principal feature is in the fs sewage of inflow and the returned sluge of second pond to be stirred and mixing, subordinate phase flatly circulate the water outlet that promotes the fs and the 3rd rank phegma and mix, the water outlet that flatly promotes and stir subordinate phase in the phase III, and second pond with triphasic water outlet be separated into clear water and the precipitation active sludge.The present invention simultaneously also provides a kind of facility that is used in above-mentioned sewage technology, and the round pond by concentric setting and two annular pools are as the three phases pond.Technology of the present invention is reliable, controls flexibly and economical, and sludge settling is good, can reach the effect of removing organic pollutant and denitrogenation dephosphorizing in the municipal wastewater efficiently.The facility low cost that is equipped with, operation energy consumption is low, and maintenance is little, is convenient to install and control.
Description
Technical field
The present invention relates to a kind of sewage treatment process and facility.
Background technology
Be used for the activated sludge process that biological municipal sewage is handled at present, such as in ATV handbook (ATV association once, present DWA association) the existing introduction in 1997 the 4th edition " biology of sewage and advanced treatment " 257 to 445 pages is that the sewage that becomes a mandarin that will isolate large particulate matter and sand mixes also oxygenation with returned sluge from second pond in the aeration tank.Main solvability and the non-solubility organic pollutant that contains in the mud degradable sewage of forming by living microorganism (bacterium, yeast, fungi).In main aerobic degradation process, produce carbonic acid gas, water, heat and new mud (excess sludge).Suspension flows into second pond after handle the aeration tank, and active sludge flocculates and is deposited at the bottom of the pond there.Sewage after the purification will be continued to handle or be discharged into natural water.The active sludge of post precipitation will be concentrated and turn back to the aeration tank again as returned sluge.
The multiple modification technology of activated sludge process also comprises and divides the aeration volume is promptly divided the aeration tank by the zone technology by known to the people.The parameter of this class technology such as BOD
5Volumetric loading and mixed liquor suspended solid, MLSS concentration roughly the same with the present invention in the parameter that relates to.Owing to do not have anaerobic pond and an anoxic pond, enter runway shape or circular aeration tank through the sewage of mechanical treatment.In the pond, because the local oxygen supply of aerator, effluent cycle is flow through near the aerobic section of aerator with away from the anoxic section of aerator, remove BOD, the effect of nitrification and denitrification thereby reach.Perhaps realize that by regulating aeration time thereby aerobic and anoxic alternative envrionment conditions reaches the effect of nitrification and denitrification.
In addition, must establish anaerobic pond in addition or add chemical agent and just can reach phosphor-removing effect.Suspension flows into second pond after handle the aeration tank, and active sludge flocculates and is deposited at the bottom of the pond there.Sewage after the purification will be continued to handle or be discharged into natural water.The active sludge of post precipitation will be concentrated and turn back to the aeration tank again as returned sluge.
In interim 504-508 of journal " Korrespondenz Abwasser " the 5/87th and 511-513 page or leaf, describe oxidation ditch and most important modification technology (oxidation ditch of sequence batch (oxidation ditch, the two oxidation ditches of alternative expression and band second pond) thereof in detail.The depth of water of these oxidation ditches almost in 1.1 to 1.5 meters scope, thereby caused floor space excessive.The brush aeration machine provides necessary oxygen and sewage to stir.These brush aeration machines cost an arm and a leg and maintenance relatively large.In order to produce enough horizontal cyclic stream, the unit power of agitator is at least 15W/m
3Carry out the intermittent type denitrification if desired, then aeration time must shorten at 12 o'clock/sky.So the aeration power of An Zhuaning must be the twice under the continuous aeration situation.
The pattern that further develops of oxidation ditch is the Carrousel technology that the inversed umbrella type aerator is housed.This pond fabrication cost height, and the inversed umbrella type aerator costs an arm and a leg, maintenance is relatively large.In order to produce enough horizontal cyclic stream, the unit power of agitator is at least 15W/m in addition
3Because the current length between the inversed umbrella type aerator is long, be difficult to control oxygenation capacity and denitrification effect.
The integrated oxidation ditch of CD and circular aeration tank low cost.But in order to produce enough horizontal cyclic stream, the unit power of agitator is at least 10W/m
3The expense of brush aeration machine costliness and maintenance thereof also are its weak points in addition.Carry out the intermittent type denitrification if desired, then aeration time must shorten at 12 o'clock/sky.So the aeration power of An Zhuaning must be the twice under the continuous oxygenation situation.
The modification technology commonly used that the technical intelligence of preceding Stengelin company has been showed the cycling stream aeration.In these technologies, transverse axis slow speed of revolution agitator can produce the cycling stream of expectation.In order to reach oxidation effect, pressurized air must be near at the bottom of the pond with the form diffusion of microbubble.Integrated oxidation ditch and circular aeration tank low cost.Yet the equipment that exposes to the sun at the bottom of slow speed of revolution agitator and the microbubble is then very expensive, and maintenance is also big in addition.Carry out the intermittent type denitrification if desired, then aeration time must shorten at 12 o'clock/sky.So the aeration power of An Zhuaning must be the twice under the continuous oxygenation situation.
Oval aeration tank cost height and equipment are expensive.In order to reach the intermittent type denitrification, aeration time must shorten to 12 hours/day in addition.For all cycling stream aeration systems, the monitoring of oxygenation capacity and denitrification effect and control are complicated and expensive.These existing systems are often built and the installation costs height, and operation costliness and effect are also unsatisfactory.
Summary of the invention
Purpose of the present invention is exactly at the construction of prior art and installation costs height, operation costliness and the not good deficiency of treatment effect, carbon based pollutants and nitrogenous compound in a kind of processing efficiency height, economical operation, the energy fast deep degradation of sewage are provided, and the activated sludge process and the facility that are used for the biological municipal sewage processing that dissolved phosphorus is absorbed by active sludge.
The technical solution used in the present invention is as follows:
A kind of activated sludge process that is used for the biological municipal sewage processing, its processing step is as follows:
A) in the fs sewage of inflow and the returned sluge of second pond are stirred and mixing, mixed solution enters into subordinate phase afterwards;
B) flatly circulate in subordinate phase and promote the phegma that the mixed solution of coming from the fs and phase III come, their are mixed, the subordinate phase mixed solution flows into the phase III afterwards;
C) utilize jet aerator flatly to circulate in the phase III and promote and stir the subordinate phase mixed solution, the second pond of a part of inflow of phase III mixed solution afterwards, another partly is back to subordinate phase;
D) be separated into clear water and precipitate active sludge in the water outlet of second pond with the phase III, its sedimentary active sludge major part is back to the fs, and small portion is discharged as residuum mud.
The useful volume of described fs accounts for 5～15% of three phases useful volume.
The useful volume of described subordinate phase accounts for 15～35% of three phases useful volume.
The useful volume of described phase III accounts for 50～80% of three phases useful volume.
The average volume load range in all stages is at 0.15～0.4kg BOD
5/ (m
3D) between.
The mixed liquor suspended solid, MLSS concentration range in all stages is at 2.5～6kg MLSS/m
3Between.
The described phase III quantity of reflux that enters into subordinate phase is 1～4 times of average sewage flooding quantity.
The described phase III quantity of reflux that enters subordinate phase is 2～3 times of average sewage flooding quantity.
Unit air demand in the subordinate phase is lower than 0.2m
3/ (m
3H).
The present invention also provides a kind of facility that is used to realize above-mentioned technology, and its scheme is as follows:
A kind of activated sludge process facility that is used for the biological municipal sewage processing, it is characterized in that it is made up of a round pond, two annular pools and second pond, the circle pond is positioned at two annular pool centers, their threes are concentric, be respectively fs pond, subordinate phase pond and phase III pond from inside to outside, circle is established a middle vertical stirrer in the pond, tilts in the subordinate phase pond near the outside, circle pond or is horizontally installed with propeller stirrer, is provided with the jet aerator in outermost phase III pond.
Beneficial effect of the present invention has:
This technology is reliable, controls flexibly and economical, and sludge settling is good, can reach the effect of removing organic pollutant and denitrogenation dephosphorizing in the municipal wastewater efficiently.The facility low cost that is equipped with, operation energy consumption is low, and maintenance is little, is convenient to install and control.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Fig. 2 is the structural representation of facility among the present invention.
Embodiment
Below in conjunction with specific embodiment the present invention is further described:
Embodiment 1:
Treatment scale is 3.000m
3The Sewage Plant of/d, sewage quantity
Be 125m
3/ h, carbon in the sewage, nitrogen, phosphor contaminant concentration are moderate, and the mean value of its water quality is:
COD：400mg/l，
BOD5：220mg/l，
SS：200mg/l，
TN：40mg/l，
NH4-N：25mg/l，
TP：8mg/l
As shown in Figure 2, treatment facility is made up of a round pond, two annular pools and second pond, the circle pond is positioned at two annular pool centers, their threes are concentric, be respectively fs pond 1, subordinate phase pond 2 and phase III pond 3 from inside to outside, the circle pond is to be provided with a middle vertical stirrer in the fs pond 1, and inclination or be horizontally installed with propeller stirrer near the subordinate phase pond 2 in the circle pond outside is provided with the jet aerator in outermost phase III pond 3.
As shown in Figure 1, behind the large particulate matter and inorganic silt particle in the removal sewage, sewage
Enter into the fs pond, enter the second pond returned sluge in addition of fs treating pond simultaneously
(125m
3/ h), they mix stirring in the pond, and nitrate that contains in the degradable returned sluge in the fs pond and active sludge will absorb dissolved phosphorus.In order to create anaerobic condition, do not import oxygen in the fs as far as possible.Promptly avoid air input and liquid splash.
At the moderate characteristic of phosphorous Pollutant levels in the water inlet, the available depth of fs treating pond 1 can be designed to 3.0m, and effective diameter is 10.3m, useful volume V
1Be 250m
3, account for the total useful volume of three phases (not comprising second pond) 10%.
The water outlet of fs and the backflow of phase III enter into the subordinate phase pond, in the pond by the horizontal cyclic plug-flow.Subordinate phase pond 2 is the annular pool of concentric ring around fs pond 1.Propeller stirrer in the subordinate phase pond 2 can provide horizontal cyclic stream, the horizontal cyclic stream that it produces can reach minimum head loss, very economical, and flow by horizontal cyclic, the backflow in the water outlet in fs pond 1 and phase III pond 3 is promoted by horizontal cyclic in subordinate phase pond 2 and mix, degraded is from the nitrate of phase III.Flow to fs pond 1 aquifer yield in subordinate phase pond 2
It is the sewage flooding quantity
Twice (250m
3/ h).Because ammonia-nitrogen content is moderate in the sewage, the quantity of reflux in phase III pond 3
Should be the sewage flooding quantity
2 times of (250m
3/ h).
In order to guarantee anoxia condition, promptly to dissolve oxygen level and be lower than 0.5mg/l, the air demand of subordinate phase should not surpass 0.2m
3/ (m
3H).
At the moderate characteristic of nitrogen-containing pollutant concentration in the water inlet, the available depth h in subordinate phase pond 2
2Can be designed to 3.0m, effectively width of corridor B
2Be 4.05m, useful volume V
2Be 563m
3, account for 22% of the total useful volume of three phases.
The Fuchs OXYSTAR aerator (every 15kW) that the water outlet in subordinate phase pond 2 will be OS20.0 by 6 models in phase III pond 3 provides oxygen and horizontal plug-flow, with degradable organic pollutant with transform the new active sludge and the nitrogenous compound of redox state.The water surface in water flow process, keep stable and pond type hydraulic performance good, therefore also be adapted at producing under the situation of smaller power density the cycling stream of expectation.Such as in the night underload, open 1 generation of having satisfied horizontal cyclic stream wherein.Can open or close 5 remaining Fuchs aerators step by step according to the dissolved oxygen concentration in oxygen requirement or the pond.Conveying is housed in phase III pond 3 contains the water pump of nitrate suspension, so that suspension degrade nitrate in subordinate phase pond 2 to subordinate phase pond 2.The subordinate phase aquifer yield that flows into the phase III pond should be the summation of sewage flooding quantity, sludge back flow quantity and phase III quantity of reflux, is 4
(500m
3/ h).
At the moderate characteristic of carbon based pollutants concentration in the water inlet, the available depth h in phase III pond 3
3Can be designed to 3.0m, effectively width of corridor B
3Be 7.0m, useful volume V
3Be 1728m
3, account for 68% of total useful volume of stage.Required minimum unit power of agitator only is 8.7W/m in this pond
3, the minimum unit power of agitator more required than existing technology reduces by 13～42%.
BOD
5Volumetric loading and mixed liquor suspended solid, MLSS concentration are one of the most basic parameters of design in the sewage active sludge treatment process, operation, and both have very high engineering using value and economic implications in conjunction with utilization.
Characteristic and the water outlet up to standard requirement moderate according to influent quality carbon containing organic pollutant, average BOD
5Volumetric loading is 0.25kg BOD
5/ (m
3D) (this value is mean value, if the organic pollutant load is excessive in the sewage, selects 0.4kg BOD
5/ (m
3D), on the contrary select 0.15kg BOD
5/ (m
3D)).This value is guaranteeing that organism is effectively degraded really surely, and effluent quality reaches under the prerequisite of pre-provisioning request and reduces the three phases cubic capacity, saves fabrication cost.
Characteristic and the water outlet up to standard requirement moderate according to the influent quality nitrogen and phosphorus pollutants, mixed liquor suspended solid, MLSS concentration is 4.0kg MLSS/m
3(this value is mean value, if trade effluent proportion is excessive in the sewage, biodegradability is poor, selects 2.5kg MLSS/m
3Otherwise, select 6.0kg MLSS/m
3).This value is effectively controlled the degradation speed and the active sludge rate of growth of organic pollutant really surely, avoids the generation of bulking sludge, reduces the fabrication cost of second pond and guarantees that effluent quality reaches pre-provisioning request.
The water outlet in phase III pond 3
Flow into second pond 4, active sludge produces flocculation and precipitation in the pond.Sewage after the processing will be continued to handle or be discharged into natural water.The mud of post precipitation will be concentrated and as returned sluge, be transported to again in the fs pond 1 by water pump.The excess sludge that produces in biological sewage treatment will be taken away and basis is disposed accordingly.
Flow into the phase III water outlet of second pond
Should be the sewage flooding quantity
And returned sluge
Summation (250m
3/ h).The sewage flooding quantity
, returned sluge
With the water yield of handling back discharge second pond
Answer difference little.Surplus sludge volume is a returned sluge
5%.The available depth h4 of second pond is 3.05m, and effective surface area A4 is 284m
2
Sewage after the processing can satisfy " urban wastewater treatment firm pollutant emission standard " one-level A standard in (GB18918-2002).
COD：50mg/l，
BOD
5：10mg/l，
SS：10mg/l，
TN：15mg/l，
NH
4-N：5(8)mg/l，
TP：0.5mg/l
Embodiment 2:
Treatment scale is 3.000m
3The Sewage Plant of/d, sewage quantity
Be 125m
3/ h, carbon based pollutants concentration is moderate in the sewage, and nitrogen and phosphorus concentration are low excessively, the mean value of its water quality is:
COD：400mg/l，
BOD5：220mg/l，
SS：200mg/l，
TN：20mg/l，
NH4-N：12mg/l，
TP：4mg/l
As shown in Figure 2, treatment facility is made up of a round pond, two annular pools and second pond, the circle pond is positioned at two annular pool centers, their threes are concentric, be respectively fs pond 1, subordinate phase pond 2 and phase III pond 3 from inside to outside, the circle pond is to be provided with a middle vertical stirrer in the fs pond 1, and inclination or be horizontally installed with propeller stirrer near the subordinate phase pond 2 in the circle pond outside is provided with the jet aerator in outermost phase III pond 3.
As shown in Figure 1, behind the large particulate matter and inorganic silt particle in the removal sewage, sewage
Enter into the fs pond, enter the second pond returned sluge in addition of fs treating pond simultaneously
(125m
3/ h), they mix stirring in the pond, and nitrate that contains in the degradable returned sluge in the fs pond and active sludge will absorb dissolved phosphorus.In order to create anaerobic condition, do not import oxygen in the fs as far as possible.Promptly avoid air input and liquid splash.
At the low excessively characteristic of phosphorous Pollutant levels in the water inlet, the available depth of fs treating pond 1 can be designed to 3.0m, and effective diameter is 7.3m, useful volume V
1Be 125m
3, total useful volume of the stage that accounts for (not comprising second pond) 5%.
The water outlet of fs and the backflow of phase III enter into the subordinate phase pond, in the pond by the horizontal cyclic plug-flow.Subordinate phase pond 2 is the annular pool of concentric ring around fs pond 1.Propeller stirrer in the subordinate phase pond 2 can provide horizontal cyclic stream, the horizontal cyclic stream that it produces can reach minimum head loss, very economical, and flow by horizontal cyclic, the backflow in the water outlet in fs pond 1 and phase III pond 3 is promoted by horizontal cyclic in subordinate phase pond 2 and mix, degraded is from the nitrate of phase III.Flow to fs pond 1 aquifer yield in subordinate phase pond 2
It is the sewage flooding quantity
Twice (250m
3/ h).Because ammonia-nitrogen content is low excessively in the sewage, the quantity of reflux in phase III pond 3
Should with the sewage flooding quantity
Quite.(125m
3/h)。
In order to guarantee anoxia condition, promptly to dissolve oxygen level and be lower than 0.5mg/l, the air demand of subordinate phase should not surpass 0.2m
3/ (m
3H).
At the low excessively characteristic of nitrogen-containing pollutant concentration in the water inlet, the available depth h in subordinate phase pond 2
2Can be designed to 3.0m, effectively width of corridor B
2Be 3.50m, useful volume V
2Be 370m
3, account for 15% of total useful volume of stage.
The Fuchs OXYSTAR aerator (every 15kW) that the water outlet in subordinate phase pond 2 will be 0S20.0 by 6 models in phase III pond 3 provides oxygen and horizontal plug-flow, with degradable organic pollutant with transform the new active sludge and the nitrogenous compound of redox state.The water surface in water flow process, keep stable and pond type hydraulic performance good, therefore also be adapted at producing under the situation of smaller power density the cycling stream of expectation.Such as in the night underload, open 1 generation of having satisfied horizontal cyclic stream wherein.Can open or close 5 remaining Fuchs aerators step by step according to the dissolved oxygen concentration in oxygen requirement or the pond.Conveying is housed in phase III pond 3 contains the water pump of nitrate suspension, so that suspension degrade nitrate in subordinate phase pond 2 to subordinate phase pond 2.The subordinate phase aquifer yield that flows into the phase III pond should be the summation of sewage flooding quantity, sludge back flow quantity and phase III quantity of reflux, is 3
(375m
3/ h).
At the moderate characteristic of carbon based pollutants concentration in the water inlet, the available depth h in phase III pond 3
3Can be designed to 3.0m, effectively width of corridor B
3Be 9.0m, useful volume V
3Be 2,043m
3, account for 80% of total useful volume of stage.Required minimum unit power of agitator only is 7.3W/m in this pond
3, the minimum unit power of agitator more required than existing technology reduces by 27～51%.
BOD
5Volumetric loading and mixed liquor suspended solid, MLSS concentration are one of the most basic parameters of design in the sewage active sludge treatment process, operation, and both have very high engineering using value and economic implications in conjunction with utilization.
Characteristic and the water outlet up to standard requirement moderate according to influent quality carbon containing organic pollutant, average BOD
5Volumetric loading is 0.25kg BOD
5/ (m
3D) (this value is mean value, if the organic pollutant load is excessive in the sewage, selects 0.4kg BOD
5/ (m
3D), on the contrary select 0.15kgBOD
5/ (m
3D)).This value is guaranteeing that organism is effectively degraded really surely, and effluent quality reaches under the prerequisite of pre-provisioning request and reduces the three phases cubic capacity, saves fabrication cost.
Characteristic and the water outlet up to standard requirement low excessively according to the influent quality nitrogen and phosphorus pollutants, mixed liquor suspended solid, MLSS concentration is 3.5kgMLSS/m
3(this value is mean value, if trade effluent proportion is excessive in the sewage, biodegradability is poor, selects 2.5kg MLSS/m
3Otherwise, select 6.0kg MLSS/m
3).This value is effectively controlled the degradation speed and the active sludge rate of growth of organic pollutant really surely, avoids the generation of bulking sludge, reduces the fabrication cost of second pond and guarantees that effluent quality reaches pre-provisioning request.
The water outlet in phase III pond 3
Flow into second pond 4, active sludge produces flocculation and precipitation in the pond.Sewage after the processing will be continued to handle or be discharged into natural water.The mud of post precipitation will be concentrated and as returned sluge, be transported to again in the fs pond 1 by water pump.The excess sludge that produces in biological sewage treatment will be taken away and basis is disposed accordingly.
Flow into the phase III water outlet of second pond
Should be the sewage flooding quantity
And returned sluge
Summation (250m
3/ h).The sewage flooding quantity
Returned sluge
With the water yield of handling back discharge second pond
Answer difference little.Surplus sludge volume is a returned sluge
5%.The available depth h4 of second pond is 3.05m, and effective surface area A4 is 284m
2
Sewage after the processing can satisfy " urban wastewater treatment firm pollutant emission standard " one-level A standard in (GB18918-2002).
COD：50mg/l，
BOD
5：10mg/l，
SS：10mg/l，
TN：15mg/l，
NH
4-N：5(8)mg/l，
TP：0.5mg/l
Embodiment 3:
Treatment scale is 3.000m
3The Sewage Plant of/d, sewage quantity
Be 125m
3/ h, carbon based pollutants concentration is moderate in the sewage, and nitrogen and phosphorus concentration are too high, the mean value of its water quality is:
COD：400mg/l，
BOD5：220mg/l，
SS：200mg/l，
TN：60mg/l，
NH4-N：36mg/l，
TP：16mg/l
As shown in Figure 2, treatment facility is made up of a round pond, two annular pools and second pond, the circle pond is positioned at two annular pool centers, their threes are concentric, be respectively fs pond 1, subordinate phase pond 2 and phase III pond 3 from inside to outside, the circle pond is to be provided with a middle vertical stirrer in the fs pond 1, and inclination or be horizontally installed with propeller stirrer near the subordinate phase pond 2 in the circle pond outside is provided with the jet aerator in outermost phase III pond 3.
As shown in Figure 1, behind the large particulate matter and inorganic silt particle in the removal sewage, sewage
Enter into the fs pond, enter the second pond returned sluge in addition of fs treating pond simultaneously
(125m
3/ h), they mix stirring in the pond, and nitrate that contains in the degradable returned sluge in the fs pond and active sludge will absorb dissolved phosphorus.In order to create anaerobic condition, do not import oxygen in the fs as far as possible.Promptly avoid air input and liquid splash.
At the too high characteristic of phosphorous Pollutant levels in the water inlet, the available depth of fs treating pond 1 can be designed to 3.0m, and effective diameter is 12.6m, useful volume V
1Be 375m
3, total useful volume of the stage that accounts for (not comprising second pond) 15%.
The water outlet of fs and the backflow of phase III enter into the subordinate phase pond, in the pond by the horizontal cyclic plug-flow.Subordinate phase pond 2 is the annular pool of concentric ring around fs pond 1.Propeller stirrer in the subordinate phase pond 2 can provide horizontal cyclic stream, the horizontal cyclic stream that it produces can reach minimum head loss, very economical, and flow by horizontal cyclic, the backflow in the water outlet in fs pond 1 and phase III pond 3 is promoted by horizontal cyclic in subordinate phase pond 2 and mix, degraded is from the nitrate of phase III.Flow to fs pond 1 aquifer yield in subordinate phase pond 2
It is the sewage flooding quantity
Twice (250m
3/ h).Because ammonia-nitrogen content is too high in the sewage, the quantity of reflux in phase III pond 3
Should be the sewage flooding quantity
4 times of (500m
3/ h).
In order to guarantee anoxia condition, promptly to dissolve oxygen level and be lower than 0.5mg/l, the air demand of subordinate phase should not surpass 0.2m
3/ (m
3H).
At the characteristic of nitrogen-containing pollutant excessive concentration in the water inlet, the available depth h in subordinate phase pond 2
2Can be designed to 3.0m, effectively width of corridor B
2Be 5.1m, useful volume V
2Be 870m
3, account for 35% of total useful volume of stage.
The Fuchs OXYSTAR aerator (every 15kW) that the water outlet in subordinate phase pond 2 will be 0S20.0 by 6 models in phase III pond 3 provides oxygen and horizontal plug-flow, with degradable organic pollutant with transform the new active sludge and the nitrogenous compound of redox state.The water surface in water flow process, keep stable and pond type hydraulic performance good, therefore also be adapted at producing under the situation of smaller power density the cycling stream of expectation.Such as in the night underload, open 1 generation of having satisfied horizontal cyclic stream wherein.Can open or close 5 remaining Fuchs aerators step by step according to the dissolved oxygen concentration in oxygen requirement or the pond.Conveying is housed in phase III pond 3 contains the water pump of nitrate suspension, so that suspension degrade nitrate in subordinate phase pond 2 to subordinate phase pond 2.The subordinate phase aquifer yield that flows into the phase III pond should be the summation of sewage flooding quantity, sludge back flow quantity and phase III quantity of reflux, is 6
(750m
3/ h).
At the moderate characteristic of carbon based pollutants concentration in the water inlet, the available depth h in phase III pond 3
3Can be designed to 3.0m, effectively width of corridor B
3Be 4.6m, useful volume V
3Be 1,266m
3, account for 50% of total useful volume of stage.Required minimum unit power of agitator is 11.8W/m in this pond
3, the average unit power of agitator more required than existing technology reduces by 21%.
BOD
5Volumetric loading and mixed liquor suspended solid, MLSS concentration are one of the most basic parameters of design in the sewage active sludge treatment process, operation, and both have very high engineering using value and economic implications in conjunction with utilization.
Characteristic and the water outlet up to standard requirement moderate according to influent quality carbon containing organic pollutant, average BOD
5Volumetric loading is 0.25kg BOD
5/ (m
3D) (this value is mean value, if the organic pollutant load is excessive in the sewage, selects 0.4kg BOD
5/ (m
3D), on the contrary select 0.15kg BOD
5/ (m
3D)).This value is guaranteeing that organism is effectively degraded really surely, and effluent quality reaches under the prerequisite of pre-provisioning request and reduces the three phases cubic capacity, saves fabrication cost.
According to influent quality nitrogen and phosphorus pollutants too high characteristic and water outlet requirement up to standard, mixed liquor suspended solid, MLSS concentration is 4.5kg MLSS/m
3(this value is mean value, if trade effluent proportion is excessive in the sewage, biodegradability is poor, selects 2.5kg MLSS/m
3Otherwise, select 6.0kg MLSS/m
3).This value is effectively controlled the degradation speed and the active sludge rate of growth of organic pollutant really surely, avoids the generation of bulking sludge, reduces the fabrication cost of second pond and guarantees that effluent quality reaches pre-provisioning request.
The water outlet in phase III pond 3
Flow into second pond 4, active sludge produces flocculation and precipitation in the pond.Sewage after the processing will be continued to handle or be discharged into natural water.The mud of post precipitation will be concentrated and as returned sluge, be transported to again in the fs pond 1 by water pump.The excess sludge that produces in biological sewage treatment will be taken away and basis is disposed accordingly.
Flow into the phase III water outlet of second pond
Should be the sewage flooding quantity
And returned sluge
Summation (250m
3/ h).The sewage flooding quantity
, returned sluge
With the water yield of handling back discharge second pond
Answer difference little.Surplus sludge volume is a returned sluge
5%.The available depth h4 of second pond is 3.05m, and effective surface area A4 is 284m
2
Sewage after the processing can satisfy " urban wastewater treatment firm pollutant emission standard " one-level A standard in (GB18918-2002).
COD：50mg/l，
BOD
5：10mg/l，
SS：10mg/l，
TN：15mg/l，
NH
4-N：5(8)mg/l，
TP：0.5mg/l
Other undeclared part of the present invention is same as the prior art.
Claims (10)
1. one kind is used for the activated sludge process that biological municipal sewage is handled, and its processing step is as follows:
A) in the fs sewage of inflow and the returned sluge of second pond are stirred and mixing, mixed solution enters into subordinate phase afterwards;
B) flatly circulate in subordinate phase and promote the mixed solution of coming from the fs and the phegma of coming of phase III, their are mixed, the subordinate phase mixed solution flows into the phase III afterwards;
C) utilize jet aerator flatly to circulate in the phase III and promote and stir the subordinate phase mixed solution, the second pond of a part of inflow of phase III mixed solution afterwards, another partly is back to subordinate phase;
D) be separated into clear water and precipitate active sludge in the water outlet of second pond with the phase III, its sedimentary active sludge major part is back to the fs, and small portion is discharged as residuum mud.
2. the activated sludge process that is used for the biological municipal sewage processing according to claim 1 is characterized in that the useful volume of described fs accounts for 5～15% of three phases useful volume.
3. the activated sludge process that is used for the biological municipal sewage processing according to claim 1 is characterized in that the useful volume of described subordinate phase accounts for 15～35% of three phases useful volume.
4. the activated sludge process that is used for the biological municipal sewage processing according to claim 1 is characterized in that the useful volume of described phase III accounts for 50～80% of three phases useful volume.
5. the activated sludge process that is used for the biological municipal sewage processing according to claim 1, the average volume load that it is characterized in that all stages is at 0.15～0.4kg BOD
5/ (m
3D).
6. the activated sludge process that is used for the biological municipal sewage processing according to claim 1, the mixed liquor suspended solid, MLSS concentration that it is characterized in that the phase III is at 2.5～6kg MLSS/m
3
7. the activated sludge process that is used for the biological municipal sewage processing according to claim 1 is characterized in that the described phase III quantity of reflux that enters into subordinate phase is 1～4 times of average sewage flooding quantity.
8. the activated sludge process that is used for the biological municipal sewage processing according to claim 7 is characterized in that the described phase III quantity of reflux that enters subordinate phase is 2～3 times of average sewage flooding quantity.
9. the activated sludge process that is used for the biological municipal sewage processing according to claim 1 is characterized in that the unit air demand in the subordinate phase is lower than 0.2m
3/ (m
3H).
10. one kind is used for the activated sludge process facility that biological municipal sewage is handled, it is characterized in that it is made up of a round pond, two annular pools and second pond, the circle pond is positioned at two annular pool centers, their threes are concentric, be respectively fs pond, subordinate phase pond and phase III pond from inside to outside, circle is established a middle vertical stirrer in the pond, in near the subordinate phase pond in the circle pond outside, tilt or be horizontally installed with propeller stirrer, in outermost phase III pond, be provided with the jet aerator.
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| CN2010101474897A CN101898827A (en) | 2010-03-16 | 2010-03-16 | Be used for activated sludge process and facility that biological municipal sewage is handled |
Applications Claiming Priority (1)
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| CN2010101474897A CN101898827A (en) | 2010-03-16 | 2010-03-16 | Be used for activated sludge process and facility that biological municipal sewage is handled |
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ID=43224810
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105174633A (en) * | 2015-09-28 | 2015-12-23 | 罗依依 | Comprehensive standard increase method for increasing standard of discharged water of municipal wastewater treatment plant from first grade B to first grade A |
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