CN113104980A - AAO continuous flow activated sludge sewage treatment method and device for enhancing biological phosphorus removal - Google Patents
AAO continuous flow activated sludge sewage treatment method and device for enhancing biological phosphorus removal Download PDFInfo
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- CN113104980A CN113104980A CN202110491998.XA CN202110491998A CN113104980A CN 113104980 A CN113104980 A CN 113104980A CN 202110491998 A CN202110491998 A CN 202110491998A CN 113104980 A CN113104980 A CN 113104980A
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- 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
- C02F3/302—Nitrification and denitrification treatment
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- 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
- C02F2001/007—Processes including a sedimentation step
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- 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
- C02F2301/043—Treatment of partial or bypass streams
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses an AAO continuous flow activated sludge sewage treatment method and device for enhancing biological phosphorus removal, and belongs to the technical field of environmental engineering. After the pretreated sewage is sequentially treated by an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, the effluent enters a subsequent treatment unit; one part of sludge in the sedimentation tank is discharged to a sludge treatment unit, and the other part of sludge flows back to the front end of the anoxic tank; and part of the mixed liquid of the anoxic tank at the tail end of the anoxic tank flows back to the front end of the anaerobic tank. The essence of the method is that only nitrate nitrogen in sludge to be refluxed to the anaerobic tank is removed in the anoxic tank through denitrification so as to eliminate the interference of the nitrate nitrogen on the anaerobic phosphorus release of phosphorus accumulating bacteria in the anaerobic tank. When the invention is used for treating sewage with low carbon-nitrogen ratio, the invention has good phosphorus removal capability which is superior to that of the common sewage treatment processes such as AAO process, UCT process, MUCT process and the like, and provides a better way for distributed sewage treatment, in particular for rural domestic sewage treatment.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to an AAO continuous flow activated sludge sewage treatment method and device for enhancing biological phosphorus removal.
Background
In small-scale sewage treatment projects such as residential domestic sewage, rural domestic sewage and the like, the emission standard executed by a sewage treatment facility is relatively loose in emission limit compared with the pollutant emission standard of a municipal sewage treatment plant executed by the municipal sewage treatment plant. Taking a water pollutant discharge standard released in a certain place as an example, the standard is suitable for the water pollutant discharge management of rural domestic sewage treatment facilities with the design scale of 50 cubic meters per day (including 50 cubic meters per day) to 500 cubic meters per day (including 500 cubic meters per day) and located in areas outside built-up areas of cities and towns. The standard is divided into three stages according to the function of a receiving water body, and for the execution primary standard of the water bodies discharged into surface water II and III, the controlled pollution factors and limit values are respectively pH value (6-9), chemical oxygen demand (80mg/L), suspended matters (20mg/L), total phosphorus (2mg/L), ammonia nitrogen (15mg/L) and animal and vegetable oil (5 mg/L). The emission standard has requirements on COD, ammonia nitrogen, SS and total phosphorus, but has no limit requirement on total nitrogen.
In rural domestic sewage treatment projects, AAO (also called A2O) process or improved process on the basis of AAO process, such as UCT process, is adopted as a biological treatment unit in many projects. The processes have the function of simultaneously removing nitrogen and phosphorus. In the biological treatment of domestic sewage, denitrification and dephosphorization have a mutual restriction relationship, and the biological dephosphorization efficiency can be improved by reducing the requirement on total nitrogen removal. The AAO and other processes adopted in the rural domestic sewage treatment project ignore the problem, so that the treatment equipment cannot exert the optimal efficiency according to the requirements of the discharge standard.
Disclosure of Invention
In order to solve the problems, the invention discloses an AAO continuous flow activated sludge sewage treatment method and device for strengthening biological phosphorus removal, which have better phosphorus removal capability when treating sewage with low carbon-nitrogen ratio.
The invention is realized by the following technical scheme:
the invention discloses an AAO continuous flow activated sludge sewage treatment method for reinforcing biological phosphorus removal, which comprises the following steps: after the pretreated sewage is sequentially treated by an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, the effluent enters a subsequent treatment unit; one part of sludge in the sedimentation tank is discharged to a sludge treatment unit, and the other part of sludge flows back to the front end of the anoxic tank; and part of the mixed liquid of the anoxic tank at the tail end of the anoxic tank flows back to the front end of the anaerobic tank.
Preferably, the hydraulic retention time of the anaerobic pool is 1.5-2 h.
Preferably, the hydraulic retention time of the anoxic pond is 3-4 h.
Preferably, the hydraulic retention time of the aerobic pool is 8-10 h.
Preferably, the reflux ratio of the mixed liquor of the anoxic tank which is refluxed to the front end of the anaerobic tank is larger than the sludge reflux ratio of the sedimentation tank.
Preferably, the sludge reflux ratio of the sedimentation tank is 1.
Preferably, the reflux ratio of the mixed liquid of the anoxic tank which flows back to the front end of the anaerobic tank is 1-2.
Preferably, the concentration of dissolved oxygen in the aerobic pool is 1.0-3.0 mg/L.
Preferably, BOD in the treated wastewater5The ratio to total nitrogen is less than 4.
The invention discloses a device for realizing the AAO continuous flow activated sludge sewage treatment method for enhancing biological phosphorus removal, which comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, wherein the bottom parts of the anaerobic tank and the anoxic tank are provided with hydraulic stirring devices, and the bottom part of the aerobic tank is provided with an aeration device; a sludge outlet of the sedimentation tank is respectively connected with the sludge treatment unit and the front end of the anoxic tank through a sludge discharge pipe and a sludge return pipe, and the tail end of the anoxic tank is connected with the front end of the anaerobic tank through an anoxic tank mixed liquid return pipe; and the sludge discharge pipe, the sludge return pipe and the mixed liquid return pipe of the anoxic tank are respectively provided with a flow measuring device and a valve.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses an AAO continuous flow activated sludge sewage treatment method for enhancing biological phosphorus removal. The essence of the method is that only nitrate nitrogen in sludge to be refluxed to the anaerobic tank is removed in the anoxic tank through denitrification so as to eliminate the interference of the nitrate nitrogen on the anaerobic phosphorus release of phosphorus accumulating bacteria in the anaerobic tank. Compared with the traditional AAO process, the return flow path is different, the sludge in the traditional AAO process flows back to the front end of the anaerobic tank from the sedimentation tank, and the mixed liquor in the aerobic tank flows back to the front end of the anoxic tank from the aerobic tank (also called as internal return flow). The interference of nitrate nitrogen existing in the returned sludge on the phosphorus release reaction of the phosphorus accumulating bacteria in the anaerobic pool cannot be eliminated by a sludge return path adopted by the AAO process, but the interference can be eliminated by the process provided by the invention. Compared with the UCT process, the return flow path adopted is different, the sludge of the UCT process flows back to the front end of the anoxic tank from the sedimentation tank, the mixed liquor of the aerobic tank flows back to the front end of the anoxic tank from the tail end of the aerobic tank, and the mixed liquor of the anoxic tank flows back to the front end of the anaerobic tank from the tail end of the anoxic tank. The denitrification load of the anoxic tank is lower, so that the denitrification efficiency is more thorough, the concentration of nitrate nitrogen in the mixed liquid flowing back to the anaerobic tank is lower, and the influence on anaerobic phosphorus release of the anaerobic tank is less. Meanwhile, compared with the UCT process, the method reduces the backflow of the mixed liquid in the aerobic tank, and saves equipment cost and operation cost of a backflow pump, a backflow pipeline and the like required by internal backflow. When the invention is used for treating sewage with low carbon-nitrogen ratio, the invention has good phosphorus removal capability which is superior to that of the common sewage treatment processes such as AAO process, UCT process, MUCT process and the like, and provides a better way for distributed sewage treatment, in particular for rural domestic sewage treatment.
Furthermore, the hydraulic retention time of the anaerobic pool is 1.5-2h, so as to realize anaerobic phosphorus release.
Further, the hydraulic retention time of the anoxic tank is 3-4h to realize anoxic denitrification.
Furthermore, the hydraulic retention time of the aerobic tank is 8-10h to ensure the complete oxidation of ammonia nitrogen.
Furthermore, the reflux ratio of the mixed liquor of the anoxic tank which flows back to the front end of the anaerobic tank is larger than the sludge reflux ratio of the sedimentation tank, and the content of the anoxic tank required by the invention is smaller under the condition of achieving the same denitrification efficiency.
Furthermore, the concentration of dissolved oxygen in the aerobic tank is 1.0-3.0mg/L, so as to ensure the complete oxidation of ammonia nitrogen.
Further, BOD in the treated wastewater5The ratio of the total nitrogen to the total nitrogen is less than 4, namely the sewage with low carbon nitrogen ratio, and the invention has better dephosphorization capability.
The device for realizing the AAO continuous flow activated sludge sewage treatment method for strengthening biological phosphorus removal, disclosed by the invention, has the advantages of reasonable structural design, high automation degree, low cost of device construction and operation and maintenance, and good application prospect in distributed sewage treatment, especially rural domestic sewage treatment.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention;
FIGS. 2a to 2l are graphs showing experimental results of examples of the present invention.
Detailed Description
The process flow of the present invention is further illustrated in detail in the accompanying drawings and examples, which are meant to be illustrative and not limiting.
Referring to fig. 1, the AAO continuous flow activated sludge sewage treatment process for enhanced biological phosphorus removal of the present invention comprises an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank sludge reflux system, an anoxic tank mixed liquor reflux system and a residual sludge discharge system. The sewage enters the anaerobic tank, namely, the sewage from the pretreatment unit such as a regulating tank is pumped into the anaerobic tank, the effluent of the anaerobic tank automatically flows into the anoxic tank, the effluent of the anoxic tank automatically flows into the aerobic tank, the effluent of the aerobic tank enters the sedimentation tank, one part of sludge in the sedimentation tank reflows to the front end of the anoxic tank, the other part of sludge is discharged to the sludge treatment unit as residual sludge, the mixed liquor in the anoxic tank reflows to the front end of the anaerobic tank from the tail end of the anoxic tank, and the supernatant on the upper part of the sedimentation tank automatically flows into the subsequent treatment unit as treated effluent. The bottom of the anaerobic tank and the bottom of the anoxic tank are provided with hydraulic stirring devices, and the bottom of the aerobic tank is provided with an aeration device.
Preferably, the dissolved oxygen concentration of the aerobic pool is maintained at 1.0-3.0 mg/L.
Preferably, the Hydraulic Retention Time (HRT) of the anaerobic pool is 1.5-2h, the HRT of the anoxic pool is 3-4h, and the HRT of the aerobic pool is 8-10 h.
Preferably, the reflux ratio of the mixed liquor of the anoxic tank which is refluxed to the front end of the anaerobic tank is larger than the sludge reflux ratio of the sedimentation tank. Specifically, the reflux ratio of sludge in the sedimentation tank can be set to be 1, and the reflux ratio of mixed liquid in an anoxic tank which is refluxed to the front end of the anaerobic tank is 1-2.
Examples
The AAO enhanced dephosphorization process is compared with the common AAO process, UCT process, MUCT process and inverted AAO process in a simulation way by adopting commercial software of GPS-X6.4 activated sludge. The sewage treatment amount designed by each comparative process is 10000m3Designing the SRT as 10d, 15d and 20d respectively, and designing the influent water quality according to BOD5the/TN is designed to be low, medium and high carbon-nitrogen ratio, as shown in Table 1; the effective volumes and hydraulic retention times of the anaerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank are shown in tables 2 and 3; the simulation results are shown in FIGS. 2a to 2 l.
Table 1 design of influent water quality for each comparative process
| Main indexes | COD | SS | BOD5 | NH3-N | TN | TP | PH | BOD5/TN | BOD5/COD |
| Unit of | mg/L | mg/L | mg/L | mg/L | mg/L | mg/L | / | / | / |
| Low carbon source | 315 | 215.6 | 157.5 | 34 | 45 | 4.2 | 6～9 | 3.5 | 0.5 |
| Medium carbon source | 380 | 260 | 190 | 34 | 45 | 4.2 | 6～9 | 4.22 | 0.5 |
| High carbon source | 495 | 338.7 | 247.5 | 34 | 45 | 4.2 | 6～9 | 5.5 | 0.5 |
TABLE 2 design volumes of treatment units for each comparative process
| Volume of | AAO | UCT | MUCT | AAO enhanced phosphorus removal process | Inverted AAO |
| Anaerobic tank m3 | 1000 | 1000 | 1000 | 1000 | 1000 |
| No. 1 anoxic pond m3 | 2000 | 2000 | 1000 | 2000 | 2000 |
| 2# anoxic tank m3 | / | / | 1000 | / | / |
| Aerobic tank m3 | 5000 | 5000 | 5000 | 5000 | 5000 |
| Secondary sedimentation tank m2*m | 350*3 | 350*3 | 350*3 | 350*3 | 350*3 |
Table 3 design hydraulic retention time for each comparative process treatment unit
| Volume of | AAO | UCT | MUCT | AAO enhanced phosphorus removal process | Inverted AAO |
| |
2 | 2 | 2 | 2 | 2 |
| No. 1 anoxic tank h | 4 | 4 | 2 | 4 | 4 |
| 2# anoxic tank h | / | / | 2 | / | / |
| |
10 | 10 | 10 | 10 | 10 |
| Secondary sedimentation tank h | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 |
Fig. 2a, fig. 2b and fig. 2c are graphs comparing concentrations of TP of effluent of the five processes when the SRT is 10d, 15d and 20d, respectively, and the five processes treat sewage with three carbon-nitrogen ratios, namely, low, medium and high, and it can be seen from the graphs that the processes of the present invention all show the advantage of the lowest concentration of TP of effluent under 9 operating conditions.
Fig. 2d, fig. 2e and fig. 2f are graphs comparing TN concentrations of effluent of the processes when the SRT is 10d, 15d and 20d respectively, and the five processes treat sewage with three carbon-nitrogen ratios of low, medium and high, and it can be seen from the graphs that the processes of the present invention all show the highest TN concentration of effluent under 9 operating conditions, which is caused by the processes of the present invention fully utilizing carbon sources for phosphorus removal, so that the processes are suitable for the occasions without limitation on TN of effluent.
And the ammonia nitrogen concentration comparison graphs of the effluent of the five processes under the three conditions of 10d, 15d and 20d of SRT respectively in the figure 2g, the figure 2h and the figure 2i are used for processing the sewage with three carbon-nitrogen ratios of low, medium and high.
Fig. 2j, fig. 2k and fig. 2l are graphs comparing the COD concentration of the effluent of the five processes when the SRT is 10d, 15d and 20d, respectively, and the five processes treat the sewage with three carbon-nitrogen ratios, i.e., low, medium and high, and it can be seen from the graphs that the COD concentration of the effluent is close to that of the other processes under 9 operating conditions.
In conclusion, the simulation results show that the AAO enhanced phosphorus removal process of the present invention has the characteristic of the lowest TP concentration of the effluent under three SRT and three water quality conditions in 5 common processes.
It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.
Claims (10)
1. An AAO continuous flow activated sludge sewage treatment method for enhancing biological phosphorus removal is characterized by comprising the following steps: after the pretreated sewage is sequentially treated by an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, the effluent enters a subsequent treatment unit; one part of sludge in the sedimentation tank is discharged to a sludge treatment unit, and the other part of sludge flows back to the front end of the anoxic tank; and part of the mixed liquid of the anoxic tank at the tail end of the anoxic tank flows back to the front end of the anaerobic tank.
2. The AAO continuous flow activated sludge sewage treatment method for enhancing biological phosphorus removal as claimed in claim 1, wherein the hydraulic retention time of the anaerobic tank is 1.5-2 h.
3. The AAO continuous flow activated sludge sewage treatment method for enhanced biological phosphorus removal as claimed in claim 1, wherein the hydraulic retention time of the anoxic tank is 3-4 h.
4. The AAO continuous flow activated sludge sewage treatment method for enhanced biological phosphorus removal as claimed in claim 1, wherein the hydraulic retention time of the aerobic tank is 8-10 h.
5. The AAO continuous flow activated sludge sewage treatment method for enhanced biological phosphorus removal as claimed in claim 1, wherein the reflux ratio of the anoxic tank mixed liquor refluxed to the front end of the anaerobic tank is greater than the sludge reflux ratio of the sedimentation tank.
6. The AAO continuous flow activated sludge sewage treatment method for enhanced biological phosphorus removal of claim 1, wherein the sludge reflux ratio of the sedimentation tank is 1.
7. The AAO continuous flow activated sludge sewage treatment method for enhanced biological phosphorus removal as claimed in claim 1, wherein the reflux ratio of the anoxic tank mixed liquor refluxed to the front end of the anaerobic tank is 1-2.
8. The AAO continuous flow activated sludge sewage treatment method for enhanced biological phosphorus removal as claimed in claim 1, wherein the dissolved oxygen concentration in the aerobic tank is 1.0-3.0 mg/L.
9. The AAO continuous flow activated sludge sewage treatment process with enhanced biological phosphorus removal of claim 1, wherein BOD in the sewage being treated5The ratio to total nitrogen is less than 4.
10. The device for realizing the AAO continuous flow activated sludge sewage treatment method for enhancing biological phosphorus removal according to any one of claims 1 to 9 comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, and is characterized in that the bottoms of the anaerobic tank and the anoxic tank are provided with hydraulic stirring devices, and the bottom of the aerobic tank is provided with an aeration device; a sludge outlet of the sedimentation tank is respectively connected with the sludge treatment unit and the front end of the anoxic tank through a sludge discharge pipe and a sludge return pipe, and the tail end of the anoxic tank is connected with the front end of the anaerobic tank through an anoxic tank mixed liquid return pipe; and the sludge discharge pipe, the sludge return pipe and the mixed liquid return pipe of the anoxic tank are respectively provided with a flow measuring device and a valve.
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| CN106517678A (en) * | 2016-12-29 | 2017-03-22 | 华南理工大学 | Rural domestic wastewater integrated processing device and technology |
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| CN106517678A (en) * | 2016-12-29 | 2017-03-22 | 华南理工大学 | Rural domestic wastewater integrated processing device and technology |
Non-Patent Citations (1)
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|---|
| 吕炳南等: "《污水好氧处理新工艺》", 31 October 2007, 哈尔滨工业大学出版社 * |
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