CN104761054A - Improvement and upgrading method of AO sewage treatment technology - Google Patents
Improvement and upgrading method of AO sewage treatment technology Download PDFInfo
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- CN104761054A CN104761054A CN201510120465.5A CN201510120465A CN104761054A CN 104761054 A CN104761054 A CN 104761054A CN 201510120465 A CN201510120465 A CN 201510120465A CN 104761054 A CN104761054 A CN 104761054A
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Abstract
The invention provides an improvement and upgrading method of an AO sewage treatment technology. A system includes: a first anaerobic tank, a second anaerobic tank, a first anoxic tank, a second anoxic tank, an aerobiotic tank, a secondary sedimentation tank, a first backflow sludge line, a second backflow sludge line, a first backflow nitrification line and a second nitrification line. The whole AO sewage treatment technology includes following steps: (1) successively feeding sewage into the first anaerobic tank, the second anaerobic tank, the first anoxic tank and the second anoxic tank; (2) enabling the sewage to flow into the aerobiotic tank through the first anaerobic tank, the second anaerobic tank, the first anoxic tank and the second anoxic tank; (3) enabling the sewage to flow into the first anoxic tank through the first backflow nitrification line, and enabling the sewage to flow into the second anoxic tank through the second backflow nitrification line; (4) enabling the sewage to flow into the secondary sedimentation tank through the aerobiotic tank, and finally enable a part of the sewage to back-flow to the first anaerobic tank through the first backflow sludge line and the other part of the sewage to back flow to the second anaerobic tank through the second backflow sludge line; and (5) discharging excess sludge from the system to obtain pure water. The system being improved and upgraded through the method is improved in both sewage treatment capability and pollutant removal efficiency.
Description
Technical field
The present invention relates to, mark method is put forward in the transformation being specifically related to a kind of AO sewage treatment process.
Background technology
The treatment process of municipal wastewater is a lot.For now, AO is the sewage treatment process applied comparatively widely, have relatively high COD removal and denitrogenation dephosphorizing effect.But according to operation practical situation for many years, its water outlet is still difficult to reach one-level A mark completely.For reaching one-level A mark, namely its effective way is take suitable measures to make upgrading to existing sewage work.According to data, existing modification measures increases by 30% ~ 50% by making the priming cost of sewage work on original basis.As can be seen here, the transformation of existing sewage work is carried mark and is faced great financial pressure.Adopt if can utilize the existing structures of AO process spent water treatment plant do simple transformation and make its effluent quality reach one-level A mark, then greatly can improve the feasibility of these type of process spent water treatment plant transformation and upgrade.This is the key issue place that quasi-solution of the present invention is determined.
In the urban wastewater treatment firm of current China operation, the sewage work more than 30% built up and puts into effect before 2006.In runed urban wastewater treatment firm, it is lower that effluent quality can reach one-level A target ratio.According to investigations, emission standard reaches sewage work's quantity about 12% of one-level A, reaches sewage work's quantity about 54% of one-level B, and 34% remaining sewage work's discharge standard is at below one-level B.From sewage treatment capacity angle, the whole sewage works processing power accounting reaching one-level emission standard A is less than 7%.Therefore, adopt appropriate technology to make upgrading to existing sewage work, and the space significantly improving effluent quality is very large.The transformation of existing sewage work is proposed target measure and is mainly contained two: 1) improve effluent quality by increase successive depths processing unit or other sewage treatment structures; 2) adopt the measures such as additional chemical dephosphorization+sterilization+additional carbon and strengthen effluent quality.But no matter adopt above-mentioned any measure, the upgrading of sewage work must bring the increase of input, and namely net result adds the investment running cost of sewage work.According to data, adopting above-mentioned measure to make sewage disposal plant effluent reach one-level A mark, increasing by 30% ~ 50% by making the priming cost of sewage disposal.As can be seen here, the transformation of existing sewage work is carried mark and is faced great financial pressure.If can under the constraint condition increasing a small amount of investment (priming cost 7% ~ 15% within), the existing structures of sewage work are utilized to do simply to transform and after optimizing its technical process, make its effluent quality reach one-level A mark completely, then greatly can improve the feasibility of existing sewage work transformation and upgrade.
For now, AO is the sewage treatment process applied comparatively extensively, have higher COD removal and denitrogenation dephosphorizing effect.But with regard to this technique operation practical situation for many years, its water outlet is still difficult to reach one-level A mark completely.
Summary of the invention
With regard to the defect of above prior art, mark method is put forward in the transformation that the object of this invention is to provide a kind of AO sewage treatment process, significantly improves sewage treatment capacity and contaminant removal efficiency.
For solving the problems of the technologies described above, mark method is put forward in the transformation that the present invention proposes a kind of AO sewage treatment process, comprise the first anaerobic pond, the second anaerobic pond, the first anoxic pond, the second anoxic pond, Aerobic Pond, second pond, the first returned sluge line, the second returned sluge line, the first nitrated line of backflow and the nitrated line of the second backflow, wherein the step of whole sewage disposal is as follows:
Sewage enters the first anaerobic pond, the second anaerobic pond, the first anoxic pond and the second anoxic pond, then flow in Aerobic Pond by the first anaerobic pond, the second anaerobic pond, the first anoxic pond, the second anoxic pond, enter in the first anoxic pond by the nitrated linear flow of the first backflow, enter in the second anoxic pond by the nitrated linear flow of the second backflow, then second pond is flowed into by Aerobic Pond, finally be back in the first anaerobic pond by the first returned sluge line, part is back in the second anaerobic pond by the second returned sluge line, excess sludge removal system, obtains pure water.
Preferably, separated by dividing plate between described first anaerobic pond and the second anaerobic pond, separated by dividing plate between described first anoxic pond and the second anoxic pond.
Preferably, when described first returned sluge line is shut down and run, the second returned sluge line works on; When described second returned sluge line quits work, the first sludge reflux line works on.
Preferably, when the nitrated line of described first backflow quits work, the nitrated line of the second backflow works on; When the nitrated line of described second backflow quits work, the nitrated line of the first backflow works on
In the present invention, only on the basis of existing AO technique, division board need be set up and be transformed into two groups of anaerobic/anoxic structures in the middle of anaerobic unit, and increasing a set of nitrification liquid return-flow system, sludge recirculation system, the structure of modification of AO technique can be realized.When wherein a set of nitrification liquid return-flow system, sludge recirculation system and corresponding water inlet system are in running status, another set of nitrification liquid return-flow system, sludge recirculation system and corresponding water inlet system are then in quiet state of having a rest.When transforming AO technique, capital cost only increases by 7% ~ 15%, but can exchange COD for and remove and the significantly improving of denitrogenation dephosphorizing effect.Compared with traditional AO and other activated sludge process, under same boundary conditions AO sewage treatment process through transformation carry mark after sewage treatment capacity and contaminant removal efficiency all significantly improved.
Accompanying drawing explanation
Fig. 1 is the schema that mark method is put forward in the transformation of a kind of AO sewage treatment process that the present invention proposes.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
As shown in Figure 1, mark method is put forward in a kind of transformation of AO sewage treatment process, comprise the first anaerobic pond, the second anaerobic pond, the first anoxic pond, the second anoxic pond, Aerobic Pond, second pond, the first returned sluge line, the second returned sluge line, the first nitrated line of backflow and the nitrated line of the second backflow, wherein the step of whole sewage disposal is as follows:
Sewage enters the first anaerobic pond, the second anaerobic pond, the first anoxic pond and the second anoxic pond, then flow in Aerobic Pond by the first anaerobic pond, the second anaerobic pond, the first anoxic pond, the second anoxic pond, enter in the first anoxic pond by the nitrated linear flow of the first backflow, enter in the second anoxic pond by the nitrated linear flow of the second backflow, then second pond is flowed into by Aerobic Pond, finally be back in the first anaerobic pond by the first returned sluge line, part is back in the second anaerobic pond by the second returned sluge line, excess sludge removal system, obtains pure water.
In a specific embodiment, separated by dividing plate between the first anaerobic pond and the second anaerobic pond, separated by dividing plate between the first anoxic pond and the second anoxic pond.
In a specific embodiment, when operation shut down by the first returned sluge line, the second returned sluge line works on.When described second returned sluge line quits work, the first sludge reflux line works on.
In a specific embodiment, when the nitrated line of the first backflow quits work, the nitrated line of the second backflow works on.When the nitrated line of the second backflow quits work, the nitrated line of the first backflow works on.
Improved AO sewage treatment process constructional feature is to define independent two cover sludge recirculation system and nitrification liquid return-flow systems, and the operation scheme of two cover return-flow system uniquenesses largely solves the effect being affected denitrification denitrogenation by the DO brought in nitrification liquid in anoxic pond, thus in guarantee system, efficient denitrification usefulness is key factor compared with the reflux ratio R of large discharge.Its result must guarantee system wherein a set of anaerobic/anoxic system normally intake and while keeping releasing phosphorus and denitrogenation, be in quiet a set of anaerobic/anoxic system of having a rest and carry out the phosphorus effect of releasing of excess and sufficient denitrogenation because of excessive anoxic.The phosphorus effect of releasing of anaerobism section polyP bacteria excess must cause polyP bacteria to inhale phosphorus in the excess of aerobic section, finally to discharge the form of excess sludge and the more significant dephosphorization effect of the system that realizes.This should be the key factor of the rear AO sewage treatment process high-efficient denitrification and dephosphorization of transformation.
A set of AO pilot reactor is had in the present embodiment, investigate water temperature and be in 16-24 DEG C, hydraulic detention time is HRT=12h, return current ratio of the mixed liquid R=200%(Aerobic Pond sludge concentration MLSS=3500-4500mg/L), return sludge ratio r=100% (returned sluge concentration MLSS=4000-6800mg/L), the COD of system remove and denitrogenation dephosphorizing effect as shown in table 1.
The traditional AO technique COD of table 1 removes and denitrogenation dephosphorizing effect
As shown in Table 1, AO sewage disposal pilot reactor effluent quality is one-level B mark.Put forward the object of mark for realizing transformation, AO pilot reactor is transformed by this seminar as stated above, and improved AO sewage treatment process carries out the pilot scale research of sanitary sewage.Control water temperature=15-22 DEG C, hydraulic detention time is HRT=8 ~ 9h, return current ratio of the mixed liquid R=200% (Aerobic Pond sludge concentration MLSS=3500-4500mg/L), return sludge ratio r=100% (returned sluge concentration MLSS=4000-6800mg/L), under the conditions such as two-phase alternate run time T=1h, COD remove and denitrogenation dephosphorizing effect as shown in table 2.
The improved AO technique of table 2 put forward mark effect
As shown in Table 2, the COD removal of improved AO sewage treatment process and denitrogenation dephosphorizing effect are very remarkable, and its effluent quality is much better than one-level A mark.Compared with traditional AO and other activated sludge process, under same boundary conditions, AO sewage treatment process is after mark is carried in transformation, its sewage load improves about 10%, COD clearance and improves about 5%, TN clearance raising about 10%, ammonia nitrogen removal frank improves about 10%, TP clearance and improves about 13%.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technology people of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (4)
1. mark method is put forward in the transformation of an AO sewage treatment process, it is characterized in that, comprise the first anaerobic pond, the second anaerobic pond, the first anoxic pond, the second anoxic pond, Aerobic Pond, second pond, the first returned sluge line, the second returned sluge line, the first nitrated line of backflow and the nitrated line of the second backflow, wherein the step of whole sewage disposal is as follows:
Sewage enters the first anaerobic pond, the second anaerobic pond, the first anoxic pond and the second anoxic pond, then flow in Aerobic Pond by the first anaerobic pond, the second anaerobic pond, the first anoxic pond, the second anoxic pond, enter in the first anoxic pond by the nitrated linear flow of the first backflow, enter in the second anoxic pond by the nitrated linear flow of the second backflow, then second pond is flowed into by Aerobic Pond, finally be back in the first anaerobic pond by the first returned sluge line, part is back in the second anaerobic pond by the second returned sluge line, excess sludge removal system, obtains pure water.
2. mark method is put forward in the transformation of a kind of AO sewage treatment process according to claim 1, it is characterized in that, is separated between described first anaerobic pond and the second anaerobic pond by dividing plate, separated between described first anoxic pond and the second anoxic pond by dividing plate.
3. mark method is put forward in the transformation of a kind of AO sewage treatment process according to claim 1, it is characterized in that, when described first returned sluge line is shut down and run, the second returned sluge line works on; When described second returned sluge line quits work, the first sludge reflux line works on.
4. mark method is put forward in the transformation of a kind of AO sewage treatment process according to claim 1, it is characterized in that, when the nitrated line of described first backflow quits work, the nitrated line of the second backflow works on; When the nitrated line of described second backflow quits work, the nitrated line of the first backflow works on.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106927644A (en) * | 2017-04-28 | 2017-07-07 | 中信环境技术（天津）有限公司 | A kind of sewage disposal system carries the remodeling method of mark dilatation |
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