CN115304161A - A/O biological denitrification process method for sectional effluent - Google Patents
A/O biological denitrification process method for sectional effluent Download PDFInfo
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- CN115304161A CN115304161A CN202210672913.2A CN202210672913A CN115304161A CN 115304161 A CN115304161 A CN 115304161A CN 202210672913 A CN202210672913 A CN 202210672913A CN 115304161 A CN115304161 A CN 115304161A
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/343—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the pharmaceutical industry, e.g. containing antibiotics
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2301/046—Recirculation with an external loop
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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
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
Abstract
The invention discloses an A/O biological denitrification process method for sectional effluent, which comprises the following steps: the wastewater, the return sludge and the return mixed liquid enter an anoxic tank for treatment according to the conventional 'A/O biological denitrification' process requirement, the effluent enters a plug flow gallery aeration tank averagely segmented along the way, each segment of the plug flow gallery aeration tank is provided with an aeration system, a blower, a mixed liquid discharge pipeline and a valve which are independently controlled, the aeration system and the valve are determined to be opened according to the pollutant along-the-way concentration of the plug flow gallery aeration tank, and all aeration systems behind the mixed liquid discharge pipeline are closed; and returning one part of the obtained mixed liquor to the anoxic tank through the reflux pump, and treating the other part of the obtained mixed liquor in a secondary sedimentation tank for subsequent treatment. When the method is used for treating the low-concentration wastewater, the blower is not easy to have mechanical failure and has low energy consumption, no exogenous organic carbon source is added, and the low operation cost and the long-term stable operation of a wastewater treatment plant are ensured.
Description
Technical Field
The invention relates to the technical field of biological wastewater treatment, in particular to an A/O biological denitrification process method for sectional effluent.
Background
The A/O biological denitrification process comprises the following steps: in an activated sludge suspension growth system, an anoxic tank, an aerobic tank and a secondary sedimentation tank are connected in series, and the wastewater is subjected to full-flow biochemical reaction to remove organic carbon in the wastewater and simultaneously realize biological denitrification (including nitrification and denitrification) effects; the anoxic tank realizes sludge-water mixing by mechanical stirring, and the aerobic tank realizes sludge-water mixing by aeration; wastewater, return sludge of the secondary sedimentation tank and mixed liquor at the tail end part of the aerobic tank enter the head end of the anoxic tank, residual mixed liquor at the tail end of the aerobic tank enters the secondary sedimentation tank to realize sludge-water separation, and residual sludge and treated water are discharged out of the system.
The wastewater treatment plant adopting the 'A/O biological denitrification' process has the inlet water concentration (such as BOD) in the actual operation process 5 、NH 3 -N, TN, etc.) is often much lower than the design concentration, i.e. the wastewater treatment plant is in a low-load operation state for a long time, which is common in China, thus causing a large amount of idle treatment capacity and waste of investment, and also bringing a challenge to the long-term daily operation management of the wastewater treatment plant. In particular, wastewater treatment plants have a relatively low influent concentration, such as the actual influent BOD 5 The value is far lower than the design value, the oxygen demand of the aeration tank of the push-flow gallery will be reduced, the DO concentration is higher, the culture and domestication of the microorganisms in the activated sludge are not facilitated, and meanwhile, the endogenous respiration of the microorganisms in the activated sludge is self-oxidationThe speed is accelerated, the activated sludge has a loose structure and smaller flocs, the concentration of the activated sludge is in a gradually descending trend, and the quality of the effluent water reaches the standard and is difficult to ensure.
For the above challenge, although the variable frequency operation can control the air volume of the blower in terms of the control of the blower, the blower operates at a low frequency for a long time, and the self heat dissipation performance is greatly reduced, which easily causes the damage of the blower. In some wastewater treatment plants, there is no significant drop in DO concentration in the aeration tank of the plug flow gallery even if the frequency of the blowers is adjusted to a minimum. The control of the air blower is correspondingly adjusted by the waste water treatment plant, the normally open type air blower is adjusted to be operated intermittently, and the air blower is easily damaged by starting and stopping for many times in one day.
For the above challenges, in terms of adding the organic carbon source, external nutrients such as sodium acetate, glucose, methanol and starch can be added to maintain the growth and propagation of microorganisms in the activated sludge, so as to keep the concentration of the activated sludge stable. However, the larger the water inflow of the wastewater treatment plant, the larger the total demand of the organic carbon source, and thus the operating cost is hard to bear by enterprises. Meanwhile, the added organic carbon source is finally converted into activated sludge and carbon dioxide (both carbon in nature) through biochemical reaction, which does not meet the strategic target of national 'double-carbon' emission reduction.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problem of how to stably keep the effluent quality up to the standard for a long time with low operation cost when the low-concentration wastewater is treated by the 'A/O biological denitrification' process. The solution proposed by the invention is: the improved A/O biological denitrification process has the advantages that the improved A/O biological denitrification process improves the flow pushing gallery aeration tank of the A/O biological denitrification process, and accordingly, the effluent quality can be stably kept to reach the standard for a long time at low operation cost.
The invention provides an A/O biological denitrification process method for sectional effluent, which comprises the following steps:
1) The wastewater, the return sludge and the return mixed liquid enter an anoxic tank for treatment according to the conventional 'A/O biological denitrification' process requirement;
2) The method comprises the following steps that (1) water discharged from an anoxic tank enters a push flow gallery aeration tank, the push flow gallery aeration tank is averagely segmented along the way, mixed liquid discharged from the tail end of the push flow gallery aeration tank is the mixed liquid discharged averagely segmented along the way, each segment is provided with an aeration system, a blower, a mixed liquid discharge pipeline and a valve which are independently controlled, and only one group of the mixed liquid discharge pipeline and the valve under the load of each type of waste water can be selected; according to the on-way concentration of the pollutants in the aeration tank of the plug flow gallery, determining that a mixed liquid discharge pipeline closest to the concentration position needs to be opened and closing all aeration systems behind the mixed liquid discharge pipeline by taking the condition that the concentration meets the water quality requirement of the effluent of the aeration tank for the first time;
3) All the sectional mixed liquor discharge pipeline valves are connected in parallel and then are converged to a mixed liquor main pipeline, one part of the mixed liquor flows back to the anoxic tank through the reflux pump, and the other part of the mixed liquor enters the secondary sedimentation tank for subsequent treatment.
The invention relates to an A/O biological denitrification process method for segmented effluent, wherein the number of the segmented segments is preferably 4-6.
The mixed liquid discharge pipeline inlets are arranged at the end of each section, the number of the pipeline inlets at the end of each section is 1-3, the pipeline inlets are evenly distributed along the width of the pool, and the plane of the pipeline inlets is 1-2 meters away from the bottom of the push flow corridor aeration pool.
In the A/O biological denitrification process method for the segmented water outlet, the aeration system which is not put into use is preferably opened and closed once every fixed time period so as to avoid the blockage of the pore passage of an air diffuser in the aeration system.
In the A/O biological denitrification process method of the sectional effluent, the DO of each sectional flow pushing gallery aeration tank is preferably controlled to be 1-2mg/L.
Compared with the prior technical measures (adjusting the air volume of a blower and adding an organic carbon source), the 'A/O biological denitrification' process method for the sectional effluent has the following remarkable advantages:
1) The number of the blast blowers is reduced, and the electric energy is saved; the mechanical damage to the blower is small, and the mechanical failure is not easy to occur first;
2) An exogenous organic carbon source is not added, so that the operation cost of a wastewater treatment plant is greatly reduced, and the strategic goal of national 'double-carbon' emission reduction is met;
3) In the push-flow gallery aeration tank, partition walls are not required to be built, and only a plurality of pipelines and valves are added, so that the process is simple.
Drawings
FIG. 1 is a schematic diagram of the process of "A/O biological denitrification" of the sectional effluent.
In fig. 1, 1 is an anoxic tank a,2 is a push flow gallery aeration tank O1,3 is a push flow gallery aeration tank O2,4 is a secondary sedimentation tank, 5 is a mixed liquid reflux pump, 6 is a sludge reflux pump, 7, 9, 11 and 13 are mixed liquid discharge ports distributed along the way, 8, 10, 12 and 14 are valves of mixed liquid discharge pipes distributed along the way, and 15 is a mixed liquid main pipe.
Detailed Description
The technical solution of the present invention is further described by the following specific embodiments and the drawings of the specification.
Example 1
The test device comprises: the total length of the biochemical pond is 3.6m (the length of the anoxic pond A is 1.2m, the length of the plug flow gallery aeration tank O1 is 1.2m, and the length of the plug flow gallery aeration tank O2 is 1.2 m), the width is 0.4m, and the height is 2.5m (the effective water depth is 2.2 m). The inflow rate of the wastewater is 0.1m 3 The flow rate of the mixed liquid is 150 percent, the sludge reflux ratio is 40 percent, the total HRT is 32h (the HRT of A, O1 and O2 is 8h, 12h and 12h respectively), the DO of the anoxic pond A is controlled below 0.5mg/L, and the DO of the plug flow gallery aeration ponds O1 and O2 is controlled at 1-2mg/L. The mixed liquor discharge ports are 7, 9, 11 and 13 in the drawing, respectively.
The wastewater is obtained from a pharmaceutical factory, and the water quality condition is shown in table 1:
table 1 design and actual values of wastewater quality in units: mg/L
| Item | COD | BOD 5 | NH 3 -N | TN |
| Design value | 900 | 310 | 35 | 40 |
| Actual value | 320 | 110 | 19.5 | 25.2 |
The operation mode is as follows: firstly, starting a system according to the conventional 'A/O biological denitrification' process requirement; the wastewater enters an anoxic tank A1 for treatment according to the conventional 'A/O biological denitrification' process requirement, the effluent of the anoxic tank enters a push flow gallery aeration tank, the push flow gallery aeration tank is averagely segmented according to the path, namely a push flow gallery aeration tank O12 and a push flow gallery aeration tank O23, and each segment is provided with an aeration system, a blower, a mixed liquid discharge pipeline and a valve which are independently controlled. Then determining the on-way concentration of the pollutants in the aeration tank of the push flow gallery, and selecting a mixed liquid discharge pipeline closest to the concentration position by taking the concentration as a criterion that the concentration meets the requirement of the effluent quality of the aeration tank for the first time; then opening a valve of the mixed liquid discharge pipeline, closing the valve of the mixed liquid discharge pipeline at the tail end of the aeration tank of the plug flow gallery, and closing all aeration systems behind the mixed liquid discharge pipeline; and finally, opening and closing the aeration system after the mixed liquid is discharged from the pipeline once every day in a fixed time period, namely opening the aeration system for 15-30 minutes and then closing the aeration system to prevent the pore passage of an air diffuser in the aeration system from being blocked. The quality of the effluent from the different mixed liquor outlets is shown in Table 2.
Table 2 effluent quality units corresponding to different mixed liquid discharge ports: mg/L
| Item | COD | BOD 5 | NH 3 -N | TN |
| Actual value of waste water | 320 | 110 | 19.5 | 25.2 |
| Mixed liquid discharge port 7 | 70 | 13 | 10.5 | 17 |
| Mixed liquid outlet 9 | 45 | 7 | 4.3 | 10 |
| Mixed |
45 | 6.8 | 3.8 | 10 |
| Mixed liquid discharge port 13 | 43 | 7 | 3.9 | 9 |
In this embodiment, as can be seen from table 2, when the actual value of the influent water concentration is lower than the design value, i.e. the "a/O biological denitrification" process is used to treat low-concentration wastewater, the mixed liquid outlet 9 can be selected as the liquid outlet, and the water quality therein reaches the standard. The quality of the mixed liquor at the mixed liquor discharge ports 11 and 13 is also up to standard, but the mixed liquor does not need to be treated in the two stages.
The above detailed description is provided for the "a/O biological denitrification" process of the sectional effluent, and the specific embodiments are only used to help understand the core idea of the present invention, and for those skilled in the art, the specific embodiments can be changed according to the core idea of the present invention. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (5)
1. An A/O biological denitrification process method for sectional effluent, which is characterized by comprising the following steps:
1) The wastewater, the return sludge and the return mixed liquid enter an anoxic tank for treatment according to the conventional 'A/O biological denitrification' process requirement;
2) The method comprises the following steps that the effluent of an anoxic tank enters a plug flow gallery aeration tank, the plug flow gallery aeration tank is averagely segmented along the way, so that the mixed liquid discharged from the tail end of the plug flow gallery aeration tank is the mixed liquid discharged averagely segmented along the way, each segment is provided with an aeration system, a blower, a mixed liquid discharge pipeline and a valve which are independently controlled, according to the pollutant along-the-way concentration of the plug flow gallery aeration tank, the mixed liquid discharge pipeline closest to the concentration position is determined to be opened by taking the concentration as a criterion that the concentration meets the effluent quality requirement of the aeration tank for the first time, and all aeration systems behind the mixed liquid discharge pipeline are closed;
3) All the segmented mixed liquid discharge pipeline valves are connected in parallel and then are converged into a mixed liquid main pipeline, one part of the mixed liquid flows back to the anoxic tank through the reflux pump, and the other part of the mixed liquid enters the secondary sedimentation tank for subsequent treatment.
2. The process of claim 1, wherein the average number of stages is 4-6.
3. The A/O biological denitrification process for sectional effluent of claim 1, wherein: the mixed liquid discharge pipe inlets are arranged at the end of each section, the number of the pipe inlets at the end of each section is 1-3, the pipe inlets are evenly distributed along the width of the aeration tank, and the distance between the plane of the pipe inlets and the bottom of the aeration tank is 1-2 meters.
4. The A/O biological denitrification process for sectional effluent of claim 1, wherein: the aeration system which is not put into use is opened and closed once every day in a fixed time period so as to avoid the blockage of the air diffuser pore passages in the aeration system.
5. The A/O biological denitrification process for sectional effluent of claim 1, wherein: the DO of each segmented push-flow corridor aeration tank is controlled to be 1-2mg/L.
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| CN101759333A (en) * | 2010-02-10 | 2010-06-30 | 彭永臻 | Apparatus for stably maintaining sludge micro-bulking for saving energy in biological denitrification technology and method thereof |
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| CN113620443A (en) * | 2021-08-27 | 2021-11-09 | 金锣水务有限公司 | Sewage treatment regulating tank and method for regulating sewage |
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