CN111547946A - Degassing tank, activated sludge sewage treatment system comprising degassing tank and treatment method - Google Patents
Degassing tank, activated sludge sewage treatment system comprising degassing tank and treatment method Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 145
- 238000007872 degassing Methods 0.000 title claims abstract description 128
- 239000010802 sludge Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 158
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000007667 floating Methods 0.000 claims abstract description 11
- 238000013019 agitation Methods 0.000 claims description 155
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 114
- 238000005192 partition Methods 0.000 claims description 35
- 230000000630 rising effect Effects 0.000 claims description 31
- 238000005273 aeration Methods 0.000 claims description 30
- 238000011010 flushing procedure Methods 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 239000011148 porous material Substances 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 3
- 238000005188 flotation Methods 0.000 claims description 2
- 210000002105 tongue Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 description 18
- 239000000470 constituent Substances 0.000 description 17
- 230000003311 flocculating effect Effects 0.000 description 16
- 239000002351 wastewater Substances 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000004062 sedimentation Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 244000144992 flock Species 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
-
- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
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Abstract
The invention provides a degassing tank, an activated sludge sewage treatment system comprising the degassing tank and a sewage treatment method. The degassing tank is used for releasing gas dissolved in the sewage and bubbles adhered to floccules in the sewage. In the degasification tank, set gradually along the flow direction of sewage: a drop zone, which is arranged in such a way that the liquid level at the downstream is lower than the liquid level of the upstream sewage treatment tank, so that the sewage falls from the upstream sewage treatment tank in the drop zone; a first stirring zone configured to perform a first stirring of the sewage, the first stirring including a drop stirring caused by the sewage from the drop zone and a first air stirring; the bubble floating area is used for guiding the sewage to flow upwards; and a second stirring section configured to perform a second stirring of the sewage, which is weaker than the first stirring strength and includes only a second air stirring, and to cause the treated sewage to flow out of the degassing tank.
Description
Technical Field
The invention relates to a degassing tank, in particular to an activated sludge sewage treatment system comprising the degassing tank and a sewage treatment method.
Background
The sewage contains a large amount of organic and inorganic pollutants containing carbon, nitrogen and phosphorus, and the pollutants are discharged into the environment to cause eutrophication of the water body and cause great damage to the ecological environment of the water body. In the current field of sewage treatment, biological treatment technology is a common technology for removing biodegradable organic matters and nitrogen in wastewater, and has been widely adopted in urban domestic sewage treatment. As a biological treatment technology, the activated sludge sewage treatment process is one of the most widely applied technologies in the field of sewage treatment. The activated sludge sewage treatment process is a sewage biological treatment technology taking activated sludge as a main body. Air is injected into the sewage for aeration, and microorganisms such as bacteria in the sewage decompose organic pollutants in the sewage by oxygen blown by the aeration. Thus, after a certain period of time, a yellowish brown floc is formed in the wastewater. The flocculating constituent is mainly composed of mass-propagated microbial population, and is easy to precipitate and separate water, and can purify and clarify sewage. This floc is a biological sludge known as "activated sludge".
In the prior art, a sewage treatment system using an activated sludge sewage treatment process generally includes an activated sludge tank and a sedimentation tank. In order to clarify the water and also to retain the activated sludge flocks, a sedimentation basin is arranged downstream of the activated sludge basin. The activated sludge flocculating constituent is settled down in the sedimentation tank and flows back to the activated sludge tank through a pump, and the clarified water flows out of the sewage treatment system. When designing above-mentioned system, in order to reduce area to and improve the active sludge pond aeration oxygen transmissivity, thereby reduce power consumption, can be usually with the depth of water design in active sludge pond 7 ~ 8 m. At this high water depth (which also means high pressure), the air is more soluble in the water, thus achieving a higher air dissolution rate. However, high water depths also present a number of problems, as discussed below. Only oxygen, which is necessary for sewage treatment, is consumed during operation of the sewage treatment system, and most other dissolved gases (such as nitrogen) are not consumed. When the water depth of the subsequent process becomes shallow (i.e. the pressure is reduced), a large amount of dissolved nitrogen is changed from a dissolved state to a gaseous state in the subsequent pipelines and structures and exists in the form of bubbles. These bubbles may block the pipeline and may also make it difficult for the activated sludge that should have settled originally to settle, thereby affecting the subsequent settling process. Meanwhile, small bubbles are adhered to the activated sludge flocs due to aeration, so that the activated sludge flocs are difficult to precipitate.
Therefore, in practice, a degassing tank is usually provided between the activated sludge tank and the sedimentation tank, as shown in fig. 1. Through the stirring in the degassing tank, the gas dissolved in the water and the bubbles adhered to the flocculating constituent can be released, and the gas can not wait for the subsequent pipeline or the structure to be released. Thus, the normal operation of the subsequent process can be ensured.
Existing sewage treatment systems employ only one deaeration tank, and most of these systems employ mechanical agitation, and a few employ air agitation using the same aeration head as the activated sludge tank. However, these systems have some problems. The system with only one degassing pool has simple design and poor degassing effect. Furthermore, existing systems do not consider quantitative specifications for the geometry of the degassing tank. For example, the water depth in the degasification tank is usually the same as the water depth in the activated sludge tank, resulting in inefficient release of dissolved gases; the tank capacity of the degassing tank has no design standard, sometimes too large and sometimes too small, so that the degassing effect is poor; the length, width and depth of the degassing pool are unreasonable, so that the stirring and degassing effects are poor. Further, the stirring manner in the existing system is not appropriate. For example, in a system using mechanical stirring, the linear velocity around the impeller of the stirrer is very high, which can break up activated sludge flocs, and the fine flocs have poor settling property in a secondary sedimentation tank and are easily carried out by water flow, thereby affecting the quality of effluent. In a system using an aeration head for air stirring, in order to achieve sufficient stirring energy, a large amount of air needs to be blown in, and additional dissolved gas is introduced into the bubbles blown in a large amount and is adhered to an activated sludge flocculating constituent, so that the flocculating constituent is difficult to precipitate in a subsequent secondary sedimentation tank, and then the effluent of the secondary sedimentation tank contains a large amount of flocculating constituents, and the water quality is poor. In addition, if the aeration apparatus similar to the activated sludge tank is used, the oxygen transfer efficiency is high, but the stirring and degassing effects are not good. Furthermore, the prior art systems do not employ any scum removal means, and therefore scum generated during the activated sludge process can accumulate on the water surface, which can affect the degassing effect.
Therefore, there is a need for a sewage treatment system and method that can solve the above problems.
Disclosure of Invention
Therefore, an object of the present invention is to provide a degassing tank, an activated sludge sewage treatment system including the degassing tank, and a sewage treatment method, which have high degassing efficiency, stable and flexible degassing effect, simple design, and low cost.
The invention relates to a degassing tank for releasing gas dissolved in sewage and bubbles adhered to flocs in the sewage. In the degasification tank, set gradually along the flow direction of sewage: a drop zone, which is arranged in such a way that the liquid level at the downstream is lower than the liquid level of the upstream sewage treatment tank, so that the sewage falls from the upstream sewage treatment tank in the drop zone; a first stirring zone configured to perform a first stirring of the sewage, the first stirring including a drop stirring caused by the sewage from the drop zone and a first air stirring; the bubble floating area is used for guiding the sewage to flow upwards; and a second stirring section configured to perform a second stirring of the sewage, which is weaker than the first stirring strength and includes only a second air stirring, and to cause the treated sewage to flow out of the degassing tank.
In one embodiment, a water drop weir for forming a water drop zone is arranged in the degassing tank, and sewage from an upstream sewage treatment tank falls from the water drop weir into the first stirring zone under the action of gravity.
In one embodiment, the amount of the first air agitation is 8 to 10Nm3/m2/h。
In one embodiment, the stirring air amount of the second air stirring is 6-8 Nm3/m2/h。
In one embodiment, the degassing tank is disposed immediately adjacent to the upstream sewage treatment tank, and includes a first partition wall for partitioning the upstream sewage treatment tank from the first agitation zone, and the drop weir is disposed at a top of the first partition wall.
In one embodiment, the degassing tank further comprises a second partition wall for separating the first stirring zone from the bubble rising zone, and the bottom of the second partition wall is provided with a first opening which communicates the first stirring zone with the bubble rising zone.
In one embodiment, the degassing tank further comprises a third partition wall for separating the bubble rising zone from the second stirring zone, and a second opening is provided at the top of the third partition wall, and the second opening communicates the bubble rising zone with the second stirring zone.
In one embodiment, the degassing tank further comprises a water outlet end wall, the bottom of the water outlet end wall is provided with a water outlet, and treated sewage in the second stirring area flows out of the water outlet.
In one embodiment, the degassing tank further comprises a first air agitation device disposed within the first agitation zone, the first air agitation device releasing air into the wastewater to effect a first air agitation of the wastewater within the first agitation zone.
In one embodiment, the degassing tank further comprises a first valve provided for the first air agitation device for adjusting the amount of gas released from the first air agitation device.
In one embodiment, the first air agitation device is a large pore aeration device or a medium pore aeration device that forms air bubbles having a diameter of 3mm or more.
In one embodiment, the degassing tank further comprises a second air agitation device disposed within the second agitation zone, the second air agitation device releasing air into the wastewater to effect a second air agitation of the wastewater within the second agitation zone.
In one embodiment, the degassing tank further comprises a second valve provided for the second air agitation device for adjusting the amount of air released from the second air agitation device.
In one embodiment, the second air stirring device is a large-pore aeration device or a medium-pore aeration device that forms air bubbles having a diameter of 3mm or more.
In one embodiment, the second air agitation device is positioned 0.15m to 0.3m from the bottom of the degasser tank.
In one embodiment, a set of second air stirring devices is provided every 3m to 4m along the length of the second stirring zone, the set of second air stirring devices comprising one or more second air stirring devices.
In one embodiment, the bubble uplift zone is a separate zone disposed separately from the first agitation zone and is in communication via a conduit.
In one embodiment, the first agitation zone is in communication with the bubble flotation zone via a conduit.
In one embodiment, the degassing pool has a water depth in the range of 3m to 4 m.
In one embodiment, the water is 500m per meter of waterfall weir water3/h。
In one embodiment, the difference in liquid level between the liquid level in the wastewater treatment tank upstream of the water drop weir and the liquid level in the first agitation zone downstream of the water drop weir is from 0.3m to 1.2 m.
In one embodiment, the residence time of the contaminated water in the first agitation zone is in the range of 2 to 5 minutes.
In one embodiment, the length of the first agitation zone in the direction of flow of the wastewater is close to the depth of the water in the degassing tank.
In one embodiment, the distance between the top of the third partition wall and the surface of the sewage water is 10 to 30 cm.
In one embodiment, the bubble uplift region is a vertical channel composed of concrete.
In one embodiment, the bubble uplift region is a pipe having an inlet in communication with the first agitation region and an outlet in communication with and at the top of the second agitation region, the outlet being at a distance of 10 to 30cm from the surface of the wastewater.
In one embodiment, the ascending flow velocity of wastewater in the bubble uplift region is in the range of 0.4 to 1.2 m/s.
In one embodiment, the area of the first opening is equal to or greater than the projected area of the bubble uplift region.
In one embodiment, the residence time of the contaminated water in the second agitation zone is in the range of 10 to 15 minutes.
In one embodiment, the length of the second agitated zone in the direction of flow of the wastewater is about an integer multiple of the depth of water in the second agitated zone.
In one embodiment, the dissolved oxygen provided by the first air agitation of the first agitation zone and/or the dissolved oxygen provided by the second air agitation of the second agitation zone is a fraction of the total dissolved oxygen required for activated sludge treatment.
In one embodiment, the air required for the first air agitation and the second air agitation is provided by an aerated air manifold of the upstream sewage treatment tank.
In one embodiment, a first dross flushing device is disposed in the first stirring area, and is positioned in the first stirring area and used for dispersing dross brought about by the circulation flow generated by the first air stirring.
In one embodiment, the first dross flushing device is located directly above the position where the drop tongue from the drop zone contacts the water surface in the first stirring zone.
In one embodiment, a second dross flushing device is arranged in the second stirring zone, and is positioned above the water level in the second stirring zone and used for dispersing dross brought about by the circulation generated by the second air stirring.
In one embodiment, the second dross flushing device is near the inside of the effluent end wall of the degassing vessel.
In one embodiment, the upstream sewage treatment tank is an activated sludge tank.
The invention also relates to an activated sludge sewage treatment system comprising a degassing tank as described above.
The present invention also relates to a sewage treatment method using an activated sludge sewage treatment system including an activated sludge tank as a sewage treatment tank and a degassing tank located downstream thereof, the method including the steps of: dropping sewage from the activated sludge tank into a first stirring zone of the degassing tank in a water dropping zone of the degassing tank; stirring the sewage for the first time in a first stirring area; guiding the sewage to flow upwards in a bubble floating area of the degassing tank; carrying out secondary stirring on the sewage in a second stirring area of the degassing pool; and flowing the sewage in the second stirring zone out of a water outlet of the degassing tank, wherein the first stirring comprises drop stirring caused by the sewage from the drop zone and first air stirring, and wherein the second stirring is weaker than the first stirring and only comprises second air stirring.
In one embodiment, the degassing tank is a degassing tank as described above.
Drawings
Advantages and objects of the present invention will be better understood from the following detailed description of preferred embodiments of the invention, taken in conjunction with the accompanying drawings. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the relationship of the various components. In the drawings:
FIG. 1 shows a schematic diagram of a prior art sewage treatment system; and
FIG. 2 shows a schematic diagram of a degasser tank of an activated sludge wastewater treatment system according to one embodiment of the present invention.
Detailed Description
Various embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Here, it is to be noted that, in the drawings, the same reference numerals are given to constituent parts having substantially the same or similar structures and functions, and repeated description thereof will be omitted. The descriptions of "first", "second", and variations thereof herein are merely for distinguishing between various components and do not limit the scope of the present invention, and "first" may be written as "second" or the like without departing from the scope of the present invention, if not specifically stated. The term "sequentially comprising A, B, C, etc" merely indicates the order of the included elements A, B, C, etc. and does not exclude the possibility of including other elements between a and B and/or between B and C.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships.
Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to fig. 2.
As shown in fig. 2, the activated sludge sewage treatment system includes an activated sludge tank and a degassing tank. The degassing tank is used for releasing gas dissolved in sewage and bubbles adhered to activated sludge flocs, and is located downstream of the activated sludge tank. In other embodiments, the degasser tank may be used in a system for treating wastewater in other ways, the system comprising an upstream wastewater treatment tank and a downstream degasser tank. In the degassing tank, a water falling area 1, a first stirring area 2, a bubble floating area 3 and a second stirring area 4 are sequentially arranged along the flowing direction of sewage.
The degassing tank comprises a water inlet end wall and a water outlet end wall which are positioned at two ends of the degassing tank. As shown in fig. 2, the deaeration tank is arranged next to the activated sludge tank, for example, both share a first partition wall w1 and are separated by a first partition wall w 1. That is, the degassing tank in fig. 2 includes a first partition wall w1 as an inlet end wall and an outlet end wall w 4. In other embodiments, the degasser tank may be provided separately from the activated sludge tank. For example, the inlet end wall of the degasser tank is separated from one end wall of the activated sludge tank. In addition, the degassing tank further comprises a second partition wall W2 separating the first agitation zone 2 from the bubble rising zone 3, and a third partition wall W3 separating the bubble rising zone 3 from the second agitation zone 4. The bottom of the second partition wall W2 is provided with a first opening 5, and the first opening 5 communicates the first agitating zone 2 with the bubble rising zone 3. The top of the third partition wall W3 is provided with a second opening 6, and the second opening 6 communicates the bubble rising zone 3 with the second agitation zone 4. For example, the first opening 5 may be one wide opening extending in the direction of the width of the second partition wall W2 (the width direction of the deaeration tank), or a plurality of openings distributed in the direction of the width of the second partition wall W2. The second opening 6 may be arranged in a similar manner to the first opening 5. In addition, the bottom of the water outlet end wall W4 is provided with a water outlet 7 through which the treated sewage in the second agitating zone 4 flows out. The arrangement of the four regions of the present invention is not limited to the above-described manner. For example, the four regions may be independent regions separated from each other, and connected by a pipe.
By arranging the water dropping zone 1, the liquid level Y2 at the downstream is lower than the liquid level Y1 of the activated sludge pool, so that the sewage falls from the activated sludge pool in the water dropping zone. As shown in fig. 2, the first partition wall w1 is used to separate the activated sludge pond from the first agitation zone 2, and the drop zone 1 is located at the top of the first partition wall w 1. To form the water drop zone, the top of the first partition wall w1 is provided with a water drop weir, so that the sewage falls from the water drop weir into the first stirring zone 2 under the action of its own gravity. The drop zone of the present invention is not limited to the above form. For example, in the case of a degassing tank separate from an activated sludge tank, the drop zone may have the form of a pipe, channel.
Through the liquid level difference, the sewage in the activated sludge pond converts potential energy into mechanical energy in the falling process, so that supersaturated gas dissolved in the sewage in the first stirring area 2 is converted into bubbles, and the bubbles can be released from the sewage. In addition, the mechanical energy drives off small bubbles adhering to the activated sludge flocs. That is, the sewage falling from the drop zone causes drop agitation to the downstream sewage.
The sewage is subjected to a first agitation in the first agitation zone 2, which includes drop agitation and first air agitation. A first air agitation device a1 is provided in the first agitation zone 2, and the first air agitation device a1 releases air into the sewage to perform first air agitation of the sewage in the first agitation zone 2. The volume of the first stirring zone 2 is small and therefore the first stirring is a stirring with a high energy density. Drop agitation provides the primary energy for the first agitation, releasing dissolved gas and desorbing micro bubbles adhered to the activated sludge flocs without introducing additional dissolved gas and adhered bubbles. The first air agitation provided by the first air agitation device a1 is used as a supplement to the first agitation, and plays roles of supplementing agitation energy and preventing precipitation. The amount of air and the intensity of agitation of the first air agitation device a1 may be adjusted according to the operating conditions. Under the synergistic action of drop stirring and first air stirring, supersaturated gas dissolved in sewage can be separated out and changed into gas again, and the micro-bubbles attached to the activated sludge flocculating constituent can be desorbed, and the micro-bubbles generated in the above-mentioned process collide with each other, are gathered and changed into bigger bubbles, and then float out of the water surface and are removed. The two stirring modes adopted in the first stirring area 2 are milder than mechanical stirring, and the completeness of the activated sludge flocculating constituents can be kept to the maximum extent through reasonable collocation, and a better degassing effect is achieved.
In the bubble rising zone 3, the sewage is guided to flow upward, and bubbles in the sewage are also given upward momentum, so that the bubbles are more likely to float out of the water surface and are removed. The upward flow of the sewage is guided, for example, through the first opening 5 at the bottom of the second partition wall W2.
After passing through the first stirring area 2 and the bubble floating area 3, gas may still exist in the sewage, and most of the dissolved gas is released to be small bubbles due to the first stirring, and the small bubbles adhered to the flocculating constituent are slowly gathered to form large bubbles, so that the second stirring area 4 is arranged at the downstream of the bubble floating area 3 to continue mild stirring, so that the bubbles float upwards and are removed, and the activated sludge flocculating constituent is not affected.
In the second stirring zone 4, the sewage is subjected to second stirring which is weaker than the first stirring strength and includes only second air stirring, and the treated sewage is caused to flow out of the degassing tank. A second air agitation device a2 is provided within the second agitation zone 4. Similar to the first air agitation device a1, the second air agitation device a2 releases air into the sewage to perform the second air agitation of the sewage in the second agitation zone 4, so that air bubbles in the sewage float out of the water surface. Thus, the second stirring zone is also referred to as a bubble elimination zone. The second air agitation is gentle agitation, for example, air agitation in which bubbles having a diameter of 3mm or more are formed, as compared with mechanical agitation. Consequently, the second air stirring can let the bubble in the sewage continue to collide, gather into bigger bubble, then the come-up is got rid of to guaranteed that the activated sludge flocculating constituent is in the suspended state all the time, avoided the sediment to take place. Further, the secondary air agitation minimizes re-dissolution of gas into the water and adherence of micro-bubbles to the activated sludge flocs. In addition, the activated sludge flocculating constituents can be collided and adhered with each other by the second air stirring to grow into larger flocculating constituents, and the settleability of the flocculating constituents is improved, so that the flocculating constituents are easier to settle in the subsequent process.
The sewage subjected to the second agitation in the second agitating zone 4 flows out through the water outlet 7 at the bottom of the water outlet end wall W4, so that short flow and dead space can be avoided.
By arranging the four areas and providing an optimized stirring mode according to different stages of sewage treatment, the degassing tank disclosed by the invention has a better degassing effect and higher degassing efficiency.
Preferred embodiments of the degassing tank of the present invention are further described below in terms of design parameters.
The depth of the degassing tank is shallow compared with that of the activated sludge tank. The water depth in the degassing tank ranges, for example, from 3m to 4 m.
The length of the drop weir is determined according to the water quantity, for example, according to the water flow of 500m per meter of drop weir3The length of the drop weir is determined by/h. In order to obtain a drop agitation of sufficient strength, the difference in level between the liquid level Y1 in the activated sludge basin upstream of the drop weir and the liquid level Y2 in the first agitation zone 2 downstream of the drop weir is 0.3m to 1.2 m. In addition, the top surface of the water falling weir may be wedge-shaped, i.e., gradually lowered in height in the length direction of the dewatering tank (in the horizontal right direction in fig. 2) for ease of manufacture.
For example, the first air-stirring device a1 is disposed above the first opening 5 at the bottom of the second partition wall w 2. In this way, the bubbles generated by the first air agitation are not carried into the downstream bubble uplift region 3 by the water flow. In addition, the rising water flow driven by the bubbles generated by the first air stirring and the downward water flow driven by the falling water positioned at the opposite side can form a circular flow (as shown by two arrows connected end to end in the first stirring area 2 in fig. 2), which is more beneficial to uniform stirring in the first stirring area 2 and achieves a better degassing effect. Moreover, the scum can be pushed to the position below the water tongue in the water drop area by the circulation, so that the scum is broken by the water tongue, and the scum accumulation is avoided. The first air agitation device a1 may also be disposed at other positions according to the shape of the first agitation zone, the water inlet position, and the water outlet position.
In order to provide gentle stirring, the first air stirring device a1 is, for example, a large hole having bubbles with a diameter of 3mm or moreAeration means or a central hole aeration means, either perforated tubes or tubes with a hole. The activated sludge pond usually adopts a blast aeration mode to send air into sewage, the blast aeration is an air diffusion device which sends pressurized air to the bottom of the aeration pond through a pipeline, and the air diffusion device enables the air to escape into mixed liquid in the form of micro bubbles. For example, the air required for the first air agitation may be supplied from the aeration air main of the activated sludge tank, but the present invention is not limited thereto, and in other embodiments, the air required for the first air agitation may be supplied from an air supply device separate from the aeration air main. For example, the first air agitation device a1 can be a pipe leading from an aeration air main in the activated sludge basin to the first agitation zone, thus reducing additional equipment investment (e.g., aeration fan investment, etc.), and because there are no underwater electromechanical components, the system maintenance is small, reducing the post-maintenance pressure. For example, the dissolved oxygen amount provided by the first air agitation a1 of the first agitation zone 2 may be a fraction of the total dissolved oxygen amount required for activated sludge treatment, and thus the total aeration amount is not increased. In addition, a first valve (not shown in fig. 2 for simplicity of illustration) may be provided for the first air agitation device a1 for adjusting the amount of air released from the first air agitation device a 1. For example, a common first valve may be provided for one or more of the first air-stirring devices a 1. The amount of stirring air used for the first air stirring in the first stirring zone 2 is, for example, 8 to 10Nm3/m2And h, namely, each square meter of the tank body needs 8-10 cubic meters of air under the standard condition every hour.
In order to avoid affecting the amount of air required for the formation of the circulation flow in the first agitation zone 2, as shown in fig. 2, the length of the first agitation zone 2 in the flow direction of the contaminated water is, for example, close to the depth of the contaminated water in the first agitation zone 2.
In order to obtain a sufficient degassing effect without affecting the activated sludge flocks, the residence time of the sewage in the first stirring zone 2 is, for example, in the range of 2 to 5 minutes.
As shown in fig. 2, a first dross flushing device b1 is further provided in the first stirring zone 2, and is located above the water level in the first stirring zone 2 for scattering rings generated by the first air stirringThe scum from the flow, thereby avoiding their accumulation on the water surface. For example, the first dross flushing device b1 is located directly above the position where the fall tongue from the fall area contacts the water surface in the first stirring section 2, so that dross due to the circulation flow caused by the first air stirring device a1 located near the second partition wall W2 can be broken up. In order to effectively remove dross, the position of the first dross flushing device b1 is generally related to the position of the first air stirring device a 1. For example, the first dross flushing apparatus b1 is located 0.5m directly above the position where the drop tongue contacts the water surface. The first dross flushing apparatus b1 can be a shower apparatus. In order to achieve a good dross removing effect, the amount of the spray water of the first dross washing apparatus b1 is, for example, 1m3I.e. 1 cubic meter of shower water per meter length per hour is required. In addition, the first dross washout apparatus b1 may be a perforated pipe with high resistance water distribution, and the water flow rate at the opening is 3 m/s.
The bubble rising zone 3 in fig. 2 is adjacent to the first agitation zone 2 through the first opening 5 at the bottom of the second partition wall W2, but the bubble rising zone 3 may be a separate area separately provided from the first agitation zone 2 in other embodiments, thereby allowing more flexible applications. For example, the bubble rising zone 3 and the first stirring zone 2 are connected to each other by a pipe. The bubble uplift zone 3 is, for example, a vertical channel made of concrete. For example, the bubble uplift zone is a section of a pipe having an inlet in communication with the first agitation zone 2 and an outlet at the top thereof in communication with the second agitation zone 4. In a degassing tank similar to that of fig. 2, the inlet may communicate with the first opening 5 at the bottom of the first partition wall W2, and the outlet may be provided in the second agitation zone 4. The present invention does not limit the form of the bubble rising zone 3. Since the bubble floating zone 3 and the first stirring zone 2 in fig. 2 are communicated tank bodies, the water depth of the bubble floating zone 3 is generally consistent with that of the first stirring zone 2 and is 3-4 m. In order to ensure the efficiency of sewage treatment, the ascending flow velocity of the sewage in the bubble rising zone is, for example, in the range of 0.4 to 1.2 m/s. The opening area of the first opening 5 of the first agitation zone 2 communicating with the bubble rising zone 3 is equal to or larger than the projected area of the bubble rising zone 3, which is determined by the amount of water and the rising flow rate (amount of water/rising flow rate).
For example, the sewage in the bubble rising zone 3 passes through the second opening 6 in the third partition wall W3 to enter the second agitation zone 4. The distance between the top of the third partition wall W3 and the surface of the sewage water is 10 to 30 cm. When the bubble rising area 3 is formed by a pipeline, the distance between the outlet at the top of the pipeline and the sewage water surface is 10 to 30 cm. As the second stirring area 4 and the bubble floating area 3 in the figure 2 are communicated tank bodies, the water depth of the second stirring area 4 is generally consistent with that of the first stirring area 2 and is 3-4 m.
For example, the second air agitation device a2 is disposed at the bottom of the third partition wall W3, for example, at a distance of 0.15m to 0.3m from the bottom of the degassing tank, to prevent sludge from being accumulated at the bottom of the tank to the maximum. The rising water flow driven by the bubbles generated by the second air stirring and the water flow from the top of the third partition wall W3 can form a circular flow (as shown by two end-to-end arrows in the second stirring area 4 in fig. 2), which is more beneficial to uniform stirring in the second stirring area 4, and achieves better degassing effect. The second air agitation device a2 may also be provided at other locations depending on the shape of the second agitation zone, the water inlet location, and the water outlet location.
The second air stirring device a2 is, for example, a large-pore aeration device or a medium-pore aeration device which forms air bubbles having a diameter of 3mm or more, or a perforated pipe, or a pipe having one hole, in order to provide gentle stirring. The air required for the second air agitation is supplied from, for example, an aeration air main of the activated sludge tank similarly to the first air agitation device a1, but the present invention is not limited thereto, and in other embodiments, the air required for the second air agitation may be supplied from an air supply device separate from the aeration air main. For example, the second air agitation device a2 can be a pipe leading from an aerated air main in the activated sludge basin to the second agitation zone 4, thus reducing additional equipment investment, and because there are no underwater electromechanical components, the system maintenance is small, reducing post-maintenance operating pressures. The amount of dissolved oxygen provided by the second air agitation in the second agitation zone 4 may be a fraction of the total dissolved oxygen required for activated sludge treatment and therefore does not increase the total aeration. Since the second stirring zone 4 is long, a set of second air stirring devices is usually arranged every 3m to 4m along the length of the second stirring zone 4a2, the set of second air stirring devices comprising one or more second air stirring devices a 2. In addition, a second valve (not shown in fig. 2 for simplicity of illustration) may be provided for the second air agitation device a2 for adjusting the amount of air released from the second air agitation device a 2. For example, a common second valve may be provided for a group of second air stirring devices. The amount of stirring air used for the second air stirring in the second stirring zone 4 is, for example, 6 to 8Nm3/m2And h, namely 6-8 cubic meters of air is needed in each square meter of the tank body per hour under the standard condition.
In order to obtain a sufficient degassing effect without affecting the activated sludge flocs, the residence time of the sewage in the second stirring zone 4 ranges, for example, from 10 to 15 minutes; the length of the second agitating zone 4 in the flow direction of the sewage is about an integral multiple of the depth of the sewage in the second agitating zone, for example, one, two, three times, etc. the depth of the sewage in the second agitating zone.
As shown in fig. 2, similarly to the first stirring section 2, a second dross flushing means b2 is provided in the second stirring section 4, which is located above the water surface in the second stirring section 4 and serves to break up dross caused by the circulation flow generated by the stirring of the second air, thereby preventing them from accumulating on the water surface. For example, the second dross flushing apparatus b2 is arranged near the inside of the outlet end wall W4 of the deaeration tank. The position of the second dross flushing apparatus b2 is generally related to the position of the second air stirring apparatus a2 for effective dross removal. For example, the second dross flushing apparatus b2 is located 0.5m above the water level in the second stirring zone 4. The second dross flushing apparatus b2 can be a shower apparatus. In order to achieve a good scum removing effect, the amount of spray water of the second scum flushing device b2 is, for example, 1m3I.e. 1 cubic meter of shower water per meter length per hour is required. In addition, the second scum flushing device b2 can also be a perforated pipe with high resistance water distribution, and the water flow rate at the opening of the perforated pipe is 3 m/s.
The embodiment of the invention standardizes the geometric size design of the degassing pool according to the degassing principle of the activated sludge process, and can realize good degassing effect.
The sewage treatment method using the activated sludge sewage treatment system may include the steps of: dropping sewage from the activated sludge tank into a first stirring zone of the degassing tank in a water dropping zone of the degassing tank; stirring the sewage for the first time in a first stirring area; guiding the sewage to flow upwards in a bubble floating area of the degassing tank; carrying out secondary stirring on the sewage in a second stirring area of the degassing pool; and enabling the sewage in the second stirring area to flow out of a water outlet of the degassing tank. The first agitation includes drop agitation and first air agitation caused by the sewage from the drop zone, and the second agitation is weaker than the first agitation and includes only second air agitation.
The degassing tank, the activated sludge sewage treatment system and the activated sludge sewage treatment method do not damage activated sludge flocculating constituents, provide stable and flexible degassing effect, avoid heavy maintenance of underwater electromechanical parts, and can be perfectly compatible with an activated sludge process blower system, thereby reducing the construction cost. In addition, the invention adopts the scum flushing device to solve the scum problem in the sewage treatment system.
Moreover, the technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention, so as to achieve the purpose of the invention.
Claims (40)
1. A degassing tank for releasing gas dissolved in sewage and bubbles adhered to flocs in the sewage,
its characterized in that, in the degasification pond, set gradually along the flow direction of sewage:
a drop zone (1) arranged such that the liquid level downstream thereof is lower than the liquid level of the upstream sewage treatment tank, whereby sewage is dropped from the upstream sewage treatment tank in the drop zone;
a first agitation zone (2) arranged to provide a first agitation of the effluent, the first agitation comprising a first air agitation and a drop agitation caused by the effluent from the drop zone;
a bubble rising zone (3) arranged to guide the sewage to flow upward; and
and a second stirring zone (4) configured to perform a second stirring of the sewage, which is weaker than the first stirring strength and includes only a second air stirring, and to cause the treated sewage to flow out of the degassing tank.
2. A degassing tank according to claim 1, characterized in that a drop weir is provided in the degassing tank for forming the drop zone (1), from which the effluent from the upstream effluent treatment tank falls under the influence of gravity into the first agitation zone (2).
3. The degassing tank according to claim 1, wherein the stirring air amount of the first air stirring is 8-10 Nm3/m2/h。
4. The degassing tank according to claim 1, wherein the stirring air volume of the second air stirring is 6-8 Nm3/m2/h。
5. The degassing tank according to claim 2, wherein the degassing tank is disposed immediately adjacent to the upstream sewage treatment tank and comprises a first partition wall (W1) for separating the upstream sewage treatment tank from the first agitation zone (2), and the drop weir is disposed on top of the first partition wall (W1).
6. The degassing tank according to claim 1, characterized in that it further comprises a second partition wall (W2) for separating the first agitation zone (2) from the bubble rising zone (3), said second partition wall being provided at its bottom with a first opening (5), said first opening (5) communicating the first agitation zone (2) with the bubble rising zone (3).
7. The degassing tank according to claim 1, further comprising a third partition wall (W3) for separating the bubble rising zone (3) from the second agitation zone (4), wherein a second opening (6) is provided at the top of the third partition wall, and the second opening (6) communicates the bubble rising zone (3) with the second agitation zone (4).
8. A degassing tank according to claim 1, characterized in that the degassing tank also comprises a water outlet end wall (W4), the bottom of which is provided with a water outlet (7) from which the treated effluent in the second agitation zone (4) flows.
9. The degassing tank according to claim 1, characterized in that the degassing tank further comprises a first air agitation device (a1) provided in the first agitation zone (2) and releasing air into the sewage to perform a first air agitation of the sewage in the first agitation zone (2).
10. The degassing tank according to claim 9, characterized in that it further comprises a first valve for the first air stirring device (a1) for adjusting the amount of air released from the first air stirring device (a 1).
11. The degassing tank according to claim 9, wherein the first air stirring means (a1) is a large-pore aeration apparatus or a medium-pore aeration apparatus that forms bubbles having a diameter of 3mm or more.
12. The degassing tank according to claim 1, characterized in that the degassing tank further comprises a second air agitation device (a2) provided in the second agitation zone (4) and releasing air into the sewage to perform a second air agitation of the sewage in the second agitation zone (4).
13. The degassing tank according to claim 12, further comprising a second valve provided for the second air agitation device (a2) for adjusting the amount of air released from the second air agitation device (a 2).
14. The degassing tank according to claim 12, wherein the second air stirring means (a2) is a large-pore aeration apparatus or a medium-pore aeration apparatus that forms bubbles having a diameter of 3mm or more.
15. The degassing tank according to claim 12, wherein the second air agitation means (a2) is provided at a distance of 0.15m to 0.3m from the bottom of the degassing tank.
16. A degassing tank according to claim 12, characterized in that a set of second air stirring devices (a2) is provided every 3m to 4m along the length of the second stirring zone (4), a set of second air stirring devices comprising one or more second air stirring devices (a 2).
17. A degassing tank according to claim 1, characterized in that the bubble rising zone (3) is a separate zone provided separately from the first agitation zone (2).
18. A degassing tank according to claim 17, characterized in that the first agitation zone (2) is in communication with the bubble rising zone (3) by means of a pipe.
19. The degasser tank as claimed in claim 1, wherein the degasser tank has a water depth ranging from 3m to 4 m.
20. The degasser tank of claim 2, wherein the weir water is 500m per meter of drop3/h。
21. A degassing tank according to claim 2, characterized in that the difference between the liquid level (Y1) in the sewage treatment tank upstream of the water falling weir and the liquid level (Y2) in the first stirring zone (2) downstream of the water falling weir is between 0.3m and 1.2 m.
22. A degassing tank according to claim 1, characterized in that the residence time of the contaminated water in the first stirring zone (2) is in the range of 2 to 5 minutes.
23. A degassing tank according to claim 1, characterized in that the length of the first agitation zone (2) in the flow direction of the contaminated water is close to the depth of the water in the degassing tank.
24. The deaeration tank according to claim 7, wherein the distance between the top of the third partition wall (W3) and the surface of the sewage water is 10 to 30 cm.
25. The degassing tank according to claim 1, characterized in that the bubble uplift zone (3) is a vertical channel made of concrete.
26. A degassing tank according to claim 1, characterized in that the bubble rising zone (3) is a pipe having an inlet communicating with the first agitation zone (2) and an outlet communicating with the second agitation zone (4) and located at the top thereof, the distance between the outlet and the surface of the contaminated water being 10 to 30 cm.
27. The degassing tank according to claim 1, characterized in that the rising flow rate of the effluent in the bubble uplift zone (3) ranges from 0.4 to 1.2 m/s.
28. The degassing tank according to claim 6, characterized in that the area of the first opening (5) is equal to or greater than the projected area of the upper bubble flotation zone (3).
29. A degassing tank according to claim 1, characterized in that the residence time of the contaminated water in the second stirring zone (4) is in the range of 10 to 15 minutes.
30. A degassing tank according to claim 1, characterized in that the length of the second agitation zone (4) in the flow direction of the contaminated water is an integer multiple of the depth of the water in the second agitation zone (4).
31. The degassing tank according to claim 1, wherein the dissolved oxygen provided by the first air agitation of the first agitation zone (2) and/or the dissolved oxygen provided by the second air agitation of the second agitation zone (4) is a fraction of the total dissolved oxygen required for activated sludge treatment.
32. The degasser tank as claimed in claim 1, wherein the air required for the first air agitation and the second air agitation is provided by an aeration air manifold of the upstream sewage treatment tank.
33. A degasser tank as claimed in claim 1, characterised in that a first dross flushing means (b1) is arranged in the first agitation zone, above the water level in the first agitation zone (2) and arranged to break up dross due to the circulation created by the first air agitation.
34. A degasser tank according to claim 33, characterized in that the first dross flushing means (b1) is located directly above the position where the drop tongues from the drop zone contact the water surface in the first agitation zone (2).
35. A degassing tank according to claim 1, characterized in that in the second stirring zone (4) there is arranged a second dross flushing means (b2) located above the water level in the second stirring zone (4) and arranged to break up dross caused by the circulation created by the stirring with the second air.
36. A degasser as claimed in claim 35 wherein the second dross flushing means (b2) is located adjacent the inside of the effluent end wall (W4) of the degasser.
37. The degasser tank of claim 1, wherein the upstream sewage treatment tank is an activated sludge tank.
38. An activated sludge sewage treatment system comprising a degasification tank as claimed in any one of claims 1 to 37.
39. A sewage treatment method using an activated sludge sewage treatment system including an activated sludge tank as a sewage treatment tank and a degassing tank located downstream thereof, characterized by comprising the steps of:
dropping sewage from the activated sludge tank into a first stirring zone of the degassing tank in a water dropping zone of the degassing tank;
stirring the sewage for the first time in a first stirring area;
guiding the sewage to flow upwards in a bubble floating area of the degassing tank;
carrying out secondary stirring on the sewage in a second stirring area of the degassing pool; and
so that the sewage in the second stirring area flows out from a water outlet of the degassing tank,
wherein the first agitation includes drop agitation and first air agitation caused by the sewage from the drop zone, and
wherein the second agitation is less intense than the first agitation and includes only a second air agitation.
40. The method of claim 39, wherein the degasser tank is as claimed in any one of claims 1 to 37.
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| CN202010410170.2A CN111547946A (en) | 2020-05-14 | 2020-05-14 | Degassing tank, activated sludge sewage treatment system comprising degassing tank and treatment method |
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| CN202010410170.2A CN111547946A (en) | 2020-05-14 | 2020-05-14 | Degassing tank, activated sludge sewage treatment system comprising degassing tank and treatment method |
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Application publication date: 20200818 |