CN103508633A - Oxidation ditch nitrogen and phosphorus removal sewage treatment system and technology thereof - Google Patents
Oxidation ditch nitrogen and phosphorus removal sewage treatment system and technology thereof Download PDFInfo
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- CN103508633A CN103508633A CN201310436503.9A CN201310436503A CN103508633A CN 103508633 A CN103508633 A CN 103508633A CN 201310436503 A CN201310436503 A CN 201310436503A CN 103508633 A CN103508633 A CN 103508633A
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Abstract
The invention provides an oxidation ditch nitrogen and phosphorus removal sewage treatment system and a technology of the treatment system, and relates to the technical field of sewage treatment. The oxidation ditch nitrogen and phosphorus removal sewage treatment system aims to the problems that in the existing treatment system, the sewage treatment capacity in the unit area is limited to cause waste of facilities and equipment, the solid-liquid separation efficiency is low, and the sludge concentration effect is bad, as the gravity precipitation technology is utilized, so that the treatment capacity is low. The system comprises a nitrogen and phosphorus removal reaction unit and a solid-liquid separation unit, which are communicated with each other, wherein the nitrogen and phosphorus removal reaction unit comprises an anaerobic tank and an oxidation ditch, which are sequentially communicated; the solid-liquid separation unit comprises a secondary sedimentation tank; the output end of the oxidation ditch is communicated with the input end of the secondary sedimentation tank; the system further comprises a dissolved gas deep tank and a floatation tank, which are communicated; the output end of the secondary sedimentation tank is communicated with the input end of the dissolved gas deep tank. The technology of the treatment system comprises the following steps: 1. anaerobic phosphorus-releasing reaction, 2. nitrification-denitrification reaction, 3. sludge-water separation, 4. gas dissolving in the deep tank, and 5. solid-liquid separation. The oxidation ditch nitrogen and phosphorus removal sewage treatment system is particularly applicable to modification works of an oxidation ditch sewage treatment plant.
Description
Technical field
Invention relates to technical field of sewage, denitrogenation dephosphorizing Sewage treatment systems and technique thereof that particularly a kind of Jiang Shen pond air supporting combines with oxidation ditch.
Background technology
Oxidation ditch (Oxidation Ditch, OD) is circulation mixed aeration tank or claims circulation mixed activated sludge process, is by professor's APasveer invention of Dutch National Institutes of Health (TND) the earliest.Since 1954 occur, oxidation Ditch Technology has obtained research and development widely at home and abroad.
Yet along with the raising day by day of municipal sewage treatment amount and processing requirements, many oxidation ditches sewage work can not meet the demands because of its water outlet, and faces the awkward situation that needs upgrading.Directly enlarging newly built construction not only needs a large amount of construction investments, but also needs newly-increased construction land, and China is in industrialization, urbanization fast-developing period at present, and it is soaring that Urban Land Price continues, and construction land is very in short supply.Therefore, the take measures potentiality of the existing oxidation ditch sewage treatment facility of deep excavation just seem very necessary.
Long-term Designing Sewage Treatment Plant service experience shows: the usefulness of sewage treatment process and the concentration of active sludge are closely bound up, and the concentration of the active sludge of system is subject to the restriction of mud-water separation effect.But, in actual construction and operational process, existing oxidation ditch sewage work, in its treatment process, adopt second pond to carry out mud-water separation, solid-liquid separation efficiency is low, and mud concentrated effect is poor, and the activated sludge concentration that is back to anaerobic pond can only maintain 2000mg/L～3000mg/L, make the microorganism in anaerobic pond and oxidation ditch be difficult to the concentration that remains higher, cause the processing power of oxidation ditch sewage work all the time in lower level; In addition, existing oxidation channel wastewater treatment system, its unit surface sewage treatment capacity is limited, causes the waste of facilities and equipment.Therefore, designing and developing returned sluge concentration systems and the technique of stability and high efficiency is more technical barrier in the urgent need to address.
Summary of the invention
For existing oxidation channel wastewater treatment system, its unit surface sewage treatment capacity is limited, causes the waste of facilities and equipment; Oxidation ditch sewage treatment technology adopts gravitational settling, solid-liquid separation efficiency is low, mud concentrated effect is poor, make the microorganism in oxidation ditch be difficult to the concentration that remains higher, cause the problem that processing power is low, the object of this invention is to provide a kind of oxidation ditch denitrogenation dephosphorizing Sewage treatment systems and technique thereof, its sewage treatment capacity is high, and good effect of separating solid from liquid, is applicable to new construction, the especially improvement project of oxidation ditch sewage work.
The technical solution adopted for the present invention to solve the technical problems is: it comprises denitrogenation dephosphorizing reaction member and the solid-liquid separation unit being connected, described denitrogenation dephosphorizing reaction member comprises anaerobic pond and the oxidation ditch being communicated with successively, described solid-liquid separation unit comprises second pond, the output terminal of described oxidation ditch is communicated with the input terminus of described second pond, described solid-liquid separation unit also comprises Rong Qishen pond and the air flotation pool being connected, and the output terminal of described second pond is communicated with the input terminus in described Rong Qishen pond.
Further, the degree of depth in described Rong Qishen pond is 30m～100m.
Further, the dark tank depth of described molten gas is 40m～50m.
Described air flotation pool is communicated with the input terminus of described anaerobic pond by pipeline.
In addition, the present invention also provides a kind of sewage treatment process of oxidation ditch denitrogenation dephosphorizing Sewage treatment systems, and its step is as follows:
One, anaerobic phosphorus release reaction: at described anaerobic pond, treatment sewage mixes the reaction of generation anaerobic phosphorus release with the active sludge that described air flotation pool is back to described anaerobic pond;
Two, nitration denitrification reaction: nitration denitrification denitrogenation is passed through in the water outlet of the described anaerobic zone after described step 1 in described oxidation ditch, and removes phosphorus;
Three, mud-water separation: the water outlet of described oxidation ditch enters carries out mud-water separation in described second pond;
The molten gas in Si,Shen pond: the mud after described step 3 mud-water separation enters pressure air-dissolving in described Rong Qishen pond;
Five, solid-liquid separation: the mud after described step 4 pressure air-dissolving enters described air flotation pool and concentrates, the concentrated activity sludge reflux that described air flotation pool surface forms is to described anaerobic pond, and all the other discharge system as excess sludge.
In described step 4, the mud of described second pond is that penetration depth is to carry out pressure air-dissolving in the described Rong Qishen pond of 30m～100m.
The degree of depth in described Rong Qishen pond is 40m～50m.
Further, in described step 5, the described concentrated active mud content that is delivered to described anaerobic pond accounts for 30%～60% of returned sluge total amount.
Further, the described concentrated active mud content of described anaerobic pond accounts for 40% of returned sluge total amount.
Effect of the present invention is: oxidation ditch denitrogenation dephosphorizing Sewage treatment systems of the present invention is provided with Rong Qishen pond and the air flotation pool of series connection, to realize efficient solid-liquid separation after traditional gravity settling basin.Rong Qishen pond utilizes water column static pressure to increase the air dissolves amount in mud mixture, and above-mentioned mud mixture enters air flotation pool again to carry out solid-liquid separation and obtain concentrated active sludge.Compare with existing oxidation channel wastewater treatment system, in the situation that floor space is identical, adopt the pneumatically supported oxidation channel wastewater treatment system in the dark pond of the present invention, its sewage load increases by 20%, has effectively improved the sewage treatment capacity for the treatment of system unit surface.
Oxidation ditch denitrogenation dephosphorizing sewage treatment process of the present invention, the mud mixture of processing through denitrogenation dephosphorizing is carried out to mud-water separation in second pond, be back to again and in Rong Qishen pond, carry out pressure air-dissolving, to improve gas content wherein, finally enter air flotation pool and carry out solid-liquid separation, in air flotation pool, can form concentration is the concentrated active sludge of 20000mg/L～40000mg/L, has increased the concentration of returned sluge.Compare the treatment process that independent employing air flotation pool carries out solid-liquid separation, treatment process of the present invention increases air solubleness in mud mixture, has guaranteed air flotation effect, and hydraulic detention time is short, has reduced energy consumption.The concentrated active sludge that is delivered to anaerobic zone in this treatment process accounts for 30%～60% of second pond returned sluge total amount, concentrated activated sludge concentration in denitrogenation dephosphorizing reaction member makes to enter more than can reach 5000mg/L, greatly improved the concentration of active sludge, can give full play to the processing potentiality of Sewage treatment systems, significantly promote the removal efficiency of pollutent.
Accompanying drawing explanation
Fig. 1 is the structural representation of the oxidation ditch denitrogenation dephosphorizing Sewage treatment systems of embodiments of the invention one.
Embodiment
Oxidation ditch denitrogenation dephosphorizing Sewage treatment systems the present invention being proposed below in conjunction with the drawings and specific embodiments
And technique is described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the object of the aid illustration embodiment of the present invention lucidly.
Sewage denitrification and dephosphorization (AAO) principle is as follows: bio-denitrifying sewage is mainly realized by nitration denitrification process, is divided into two stages of nitrification and denitrification.Under aerobic condition, utilize the nitrobacteria in sewage that nitride is converted into nitrate, then under anoxia condition (dissolved oxygen concentration < 0.5mg/L), utilizes the denitrifying bacterium in sewage that nitrate reduction is become to gaseous nitrogen.
Biological removal of phosphorus in wastewater is mainly taken the photograph phosphorus and mud discharging is realized by polyP bacteria is excessive, and its reaction process is mainly that anaerobic phosphorus release and aerobic (anoxic) are inhaled two processes of phosphorus.That is: under anaerobic, polyphosphate particle (poly-P) generate energy in polyP bacteria degraded body, discharges phosphoric acid salt, absorbs the organism in water simultaneously, and is translated into poly-beta-hydroxy alkanoate (PHA) and is stored in cell; Under aerobic or anoxia condition, the PHA in polyP bacteria oxygenolysis body, glycogen biosynthesis, the Ruminants animal poly-phosphate in excessive absorption water of while, thus reach the object of removing phosphorus in water.
Embodiment mono-: the oxidation ditch denitrogenation dephosphorizing Sewage treatment systems that the present embodiment is described below in conjunction with Fig. 1, it comprises denitrogenation dephosphorizing reaction member 10 and the solid-liquid separation unit 20 being connected, denitrogenation dephosphorizing reaction member 10 comprises anaerobic pond 101 and the oxidation ditch 102 being communicated with successively, solid-liquid separation unit 20 comprises second pond 201 ,Rong Qishen ponds 202 and the air flotation pool 203 being communicated with successively, and the output terminal of oxidation ditch 102 is communicated with the input terminus of second pond 201.
Further, air flotation pool 203 is communicated with the input terminus of anaerobic pond 101 by pipeline.
In denitrogenation dephosphorizing reaction member 10, the input terminus of anaerobic pond 101 is communicated with sewage inlet A, sewage mixes at anaerobic pond 101 with the concentrated active sludge of coming from air flotation pool 203 backflows by pipeline, the reaction of generation anaerobic phosphorus release, polyphosphate particle (poly-P) generate energy in polyP bacteria degraded body in concentrated active sludge, discharge phosphoric acid salt, meanwhile, the short chain fatty acid that polyP bacteria absorbs in sewage forms PHB(
poly-β-hydroxybutyric acidpoly-β-hydroxybutyrate, PHB is a kind of of PHA) and be stored in cell paste.
The output terminal of anaerobic pond 101 is communicated with the input terminus of oxidation ditch 102, oxidation ditch 102 utilizes continuous ring type reaction tank (Cintinuous Loop Reator, abbreviation CLR) make biological reaction tank, the water outlet of anaerobic pond 101 enters in oxidation ditch 102 pond bodies, and rely on the thrust of submersible water impeller to flow in oxidation ditch 102 pond body-internal-circulations, can be for the sewage oxygenation in the body of pond be with microbial consumption in supplying water during rotary aeration disc work, when rotary aeration disc quits work, sewage in the body of pond is just in anoxic condition, sewage in the body of pond is under the plug-flow effect of submersible water impeller, formation aerobic-anaerobic circulates, can effectively remove organism, pass through nitration denitrification denitrogenation simultaneously, and remove phosphorus, finally by the sewage of processing, by the output terminal of oxidation ditch 102, enter second pond 201.
In the oxidation ditch denitrogenation dephosphorizing Sewage treatment systems of the present embodiment, the output terminal of oxidation ditch 102 is communicated with the second pond 201 of solid-liquid separation unit 20, carrying out mud-water separation in the reacted mud mixture input of denitrogenation dephosphorizing second pond 201, the water outlet of second pond 201 is through water outlet B output system and enter subsequent disposal unit, and pressure air-dissolving is carried out in the sludge reflux Zhi Rongqishen pond 202 of second pond 201 bottoms.The diameter in Rong Qishen pond 202 is about 1.0m～6.0m, and the degree of depth is about 30m～100m, and bottom, pond is provided with aerating apparatus, Rong Qishen pond 202 utilizes water column static pressure, gas-liquid two-phase is mixed, and bubble and liquid are long duration of contact, can significantly improve the gas content in mud mixture.Preferably ，Rong Qishen pond 202 degree of depth are 40m～50m, and now ，Rong Qishen pond 202 water colunm pressures are moderate.The main suspended state that relies on blast aeration to maintain active sludge in Rong Qishen pond 202.
The output terminal in Rong Qishen pond 202 is communicated with the input terminus of air flotation pool 203, will complete the mud mixture input air flotation pool 203 of molten gas, and mud mixture discharges microbubble under negative pressure, for air supporting.Air supporting is the micro-bubble that height of formation disperses in water, and micro-bubble sticks on the solid or liquid particle of hydrophobic group in sewage, forms apparent density and is less than the flco of water and floats to the water surface, thereby realize the process of solid-liquid separation.Mud mixture is by the solid-liquid separation of air flotation pool 203, can form concentration is the concentrated active sludge of 20000mg/L～40000mg/L, the concentrated activity sludge reflux on air flotation pool 203 tops is to anaerobic pond 101, the clear liquid on air flotation pool 203 tops is delivered to the end of denitrogenation dephosphorizing reaction member 10, clear liquid enters second pond 201 after mixing with the water outlet of oxidation ditch 102, or flows directly into second pond 201.The excess sludge that contains phosphorus is discharged system by the mud relief outlet C of air flotation pool 203 bottoms, thereby reaches the object of removing phosphorus in water.
In the present embodiment, utilize original second pond 201 in Sewage treatment systems to carry out mud-water separation, mud after separation enters pressure air-dissolving in Rong Qishen pond 202 again, and form high-concentration activated sludge in air flotation pool 203, by refluxing to improve the concentration of active sludge in denitrogenation dephosphorizing reaction member 10, thereby improve the treatment efficiency of whole Sewage treatment systems.Adopt the oxidation ditch denitrogenation dephosphorizing Sewage treatment systems in Rong Qishen pond 202 to compare with conventional processing system, sewage load increases by 20%, has effectively improved the sewage treatment capacity for the treatment of system unit surface.
In above-described embodiment, material used, reagent etc., if no special instructions, all can obtain from commercial channels.
Embodiment bis-: the oxidation ditch denitrogenation dephosphorizing sewage treatment process that the present embodiment is described below in conjunction with Fig. 1, comprises the steps:
One, anaerobic phosphorus release reaction: first sewage enter anaerobic zone 101, and treatment sewage mixes with the thickened sludge that air flotation pool 203 is back to anaerobic zone 101,, there is anaerobic phosphorus release reaction in hydraulic detention time 1.5h; Polyphosphate particle (poly-P) generate energy in polyP bacteria degraded body in active sludge, discharges phosphoric acid salt, and meanwhile, the short chain fatty acid that polyP bacteria absorbs in sewage forms PHB and is stored in cell paste.
Two, nitration denitrification reaction: the water outlet of anaerobic pond 101 enters oxidation ditch 102 oxygen-starved area, denitrifying bacteria utilizes the carbon source in the water inlet of oxidation ditch 102 to carry out anti-nitration reaction and realizes denitrogenation, sewage enters oxidation ditch 102 aerobic zone under angle of rake effect, in aerobic zone, realize the removal of COD, ammonia nitrogen and total phosphorus, the residence time of sewage in oxidation ditch 102 is 10.0h;
Three, mud-water separation: the water outlet of oxidation ditch 102 enters in second pond 201 carries out mud-water separation, and the surface load of second pond 201 is 0.9m
3/ (m
2h), hydraulic detention time is 2.5～4.0h, and the water outlet after mud-water separation is through water outlet B output system and enter subsequent disposal unit, and pressure air-dissolving is carried out in the sludge reflux Zhi Rongqishen pond 202 of second pond 201 bottoms.
The molten gas in Si,Shen pond: the returned sluge of second pond 201 enters Rong Qishen pond 202, the degree of depth in Rong Qishen pond 202 is 50m, the supply position of air compressor is 1～2min apart from hydraulic detention time in liquid level 40m ，Rong Qishen pond 201, and gas-solid ratio is controlled at 0.005～0.006; In Rong Qishen pond 202, utilize water column static pressure to complete the molten gas process of mud.
Five, solid-liquid separation: the mud of process pressure air-dissolving enters air flotation pool 203 and carries out solid-liquid separation, in air flotation pool 203, active sludge is because the buoyancy of bubble forms the thickened sludge that concentration is 20000mg/L～40000mg/L on surface, concentrated active sludge is delivered to anaerobic pond 101 by sludge reflux pump, the conveying ratio of concentrated active sludge accounts for 40% of returned sluge total amount in step 4,4%～10% the excess sludge that contains polyP bacteria is discharged to system by mud relief outlet C simultaneously, when guaranteeing sludge activity, realize biological phosphate-eliminating.The clear liquid on air flotation pool 203 tops is delivered to the end of denitrogenation dephosphorizing reaction member 10, and clear liquid enters second pond 201 after mixing with the water outlet of oxidation ditch 102, or flows directly into second pond 201, to avoid the active sludge in clear liquid dilution oxidation ditch 102.
With C
denitrogenation dephosphorizing reaction memberrepresent to be back to the concentrated sludge concentration of denitrogenation dephosphorizing reaction member, C
air flotation poolexpression concentration of active sludge in air flotation pool after solid-liquid separation, P
backflow ratiothe reflux ratio that represents concentrated active sludge, the concentration of the concentrated active sludge in denitrogenation dephosphorizing reaction member can be calculated by following formula:
In the present embodiment, take air flotation pool activated sludge concentration as 20000mg/L, when reflux ratio is 40%, according to above formula, show that activated sludge concentration concentrated in denitrogenation dephosphorizing reaction member is 5714mg/L.
Embodiment tri-: the oxidation ditch denitrogenation dephosphorizing sewage treatment process of the present embodiment is described in conjunction with Fig. 1, and different from embodiment bis-, in step 4, the degree of depth in ，Rong Qishen pond 202 is 30m, and the supply position of air compressor is apart from liquid level 20m; In step 5, the conveying ratio of concentrated active sludge accounts for 60% of returned sluge total amount in step 4.
Take air flotation pool activated sludge concentration as 20000mg/L, when reflux ratio is 60%, according to above-mentioned formula, show that in denitrogenation dephosphorizing reaction member, thickened sludge concentration is 7500mg/L.
Embodiment tetra-: the oxidation ditch denitrogenation dephosphorizing sewage treatment process of the present embodiment is described in conjunction with Fig. 1, and different from embodiment bis-, in step 4, the degree of depth in ，Rong Qishen pond 202 is 100m, and the supply position of air compressor is apart from liquid level 80m; In step 5, the conveying ratio of concentrated active sludge accounts for 30% of returned sluge total amount.
Take air flotation pool activated sludge concentration as 40000mg/L, when reflux ratio is 30%, according to above-mentioned formula, show that sludge concentration concentrated in denitrogenation dephosphorizing reaction member is 9230mg/L.
In sum, when the conveying ratio of concentrated active sludge account for returned sluge total amount 30%～60% time, concentrated activated sludge concentration in denitrogenation dephosphorizing reaction member 10 enters more than can reach 5000mg/L, the activated sludge concentration of comparing after traditional gravity settling basin solid-liquid separation can only maintain 2000mg/L～3000mg/L, sewage treatment process of the present invention has greatly improved the concentration of active sludge concentrated in denitrogenation dephosphorizing reaction member 10, can give full play to the processing potentiality of Sewage treatment systems, significantly promote the removal efficiency of pollutent.
Foregoing description is only the description to preferred embodiment of the present invention, the not any restriction to the scope of the invention, and any change, modification that the those of ordinary skill in field of the present invention is done according to above-mentioned disclosure, all belong to the protection domain of claims.
Claims (9)
1. oxidation ditch denitrogenation dephosphorizing Sewage treatment systems, comprise the denitrogenation dephosphorizing reaction member and the solid-liquid separation unit that are connected, described denitrogenation dephosphorizing reaction member comprises anaerobic pond and the oxidation ditch being communicated with successively, described solid-liquid separation unit comprises second pond, the output terminal of described oxidation ditch is communicated with the input terminus of described second pond, it is characterized in that: described solid-liquid separation unit also comprises Rong Qishen pond and the air flotation pool being connected, the output terminal of described second pond is communicated with the input terminus in described Rong Qishen pond.
2. oxidation ditch denitrogenation dephosphorizing Sewage treatment systems according to claim 1, is characterized in that: the degree of depth in described Rong Qishen pond is 30m～100m.
3. oxidation ditch denitrogenation dephosphorizing Sewage treatment systems according to claim 2, is characterized in that: the dark tank depth of described molten gas is 40m～50m.
4. oxidation ditch denitrogenation dephosphorizing Sewage treatment systems according to claim 1, is characterized in that: described air flotation pool is communicated with the input terminus of described anaerobic pond by pipeline.
5. a sewage treatment process that adopts the oxidation ditch denitrogenation dephosphorizing Sewage treatment systems described in claim 1 to 4 any one claim, its step is as follows:
One, anaerobic phosphorus release reaction: at described anaerobic pond, treatment sewage mixes the reaction of generation anaerobic phosphorus release with the active sludge that described air flotation pool is back to described anaerobic pond;
Two, nitration denitrification reaction: nitration denitrification denitrogenation is passed through in the water outlet of the described anaerobic zone after described step 1 in described oxidation ditch, and removes phosphorus;
Three, mud-water separation: the water outlet of described oxidation ditch enters carries out mud-water separation in described second pond;
The molten gas in Si,Shen pond: the mud after described step 3 mud-water separation enters pressure air-dissolving in described Rong Qishen pond;
Five, solid-liquid separation: the mud after described step 4 pressure air-dissolving enters described air flotation pool and concentrates, the concentrated activity sludge reflux that described air flotation pool surface forms is to described anaerobic pond, and all the other discharge system as excess sludge.
6. according to the oxidation ditch denitrogenation dephosphorizing sewage treatment process described in right 5, it is characterized in that: in described step 4, the mud of described second pond is that penetration depth is to carry out pressure air-dissolving in the described Rong Qishen pond of 30m～100m.
7. according to the oxidation ditch denitrogenation dephosphorizing sewage treatment process described in right 6, it is characterized in that: the degree of depth in described Rong Qishen pond is 40m～50m.
8. according to the oxidation ditch denitrogenation dephosphorizing sewage treatment process described in right 5, it is characterized in that: in described step 5, the described concentrated active mud content that is delivered to described anaerobic pond accounts for 30%～60% of returned sluge total amount.
9. oxidation ditch denitrogenation dephosphorizing sewage treatment process according to claim 8, is characterized in that: the described concentrated active mud content of described anaerobic pond accounts for 40% of returned sluge total amount.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108585347A (en) * | 2018-03-21 | 2018-09-28 | 北京工业大学 | A kind of device and method that segmental influent oxidation ditch process adjusts low C/N municipal sewages |
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Application publication date: 20140115 |