CN111453917A - Device and process applied to sewage treatment - Google Patents
Device and process applied to sewage treatment Download PDFInfo
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- CN111453917A CN111453917A CN202010091441.2A CN202010091441A CN111453917A CN 111453917 A CN111453917 A CN 111453917A CN 202010091441 A CN202010091441 A CN 202010091441A CN 111453917 A CN111453917 A CN 111453917A
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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
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F3/10—Packings; Fillings; Grids
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/38—Gas flow rate
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- 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)
- Separation Using Semi-Permeable Membranes (AREA)
- Activated Sludge Processes (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention belongs to the technical field of sewage treatment, and discloses a device and a process applied to sewage treatment, which comprise a sewage treatment body and a dissolved air tank, wherein an air flotation region, an aerobic biochemical filler region and an MBR membrane treatment region are sequentially arranged in the sewage treatment body, and the air flotation region, the aerobic biochemical filler region and the upper end of the MBR membrane treatment region are sequentially communicated; the water outlet end of the MBR membrane treatment area and an externally connected compressed air pipeline are respectively connected with the inlet end of the dissolved air tank; the outlet end of the dissolved air tank is connected with the bottom end of the air floating area. And part of effluent of the MBR membrane treatment area is used as a source of dissolved air water in the air floatation area, so that the condition that a releaser of air floatation is blocked because the effluent of air floatation is directly used as the dissolved air water of air floatation can be avoided.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a device and a process applied to sewage treatment.
Background
At present, the domestic sewage and industrial wastewater treatment process adopts mature primary physicochemical treatment, secondary biochemical treatment and tertiary advanced treatment modes. The first-stage physicochemical treatment mainly comprises modes of physical and chemical precipitation, oil separation, filtration, air flotation and the like; the secondary biochemical treatment comprises anaerobic biochemical treatment, aerobic biochemical treatment and various combined processes, such as UASB, IC, AO, oxidation ditch, AAO, CASS and the like; the three-stage advanced treatment comprises membrane filtration methods such as MBR, UF, NF, RO and the like, and advanced filtration adsorption methods such as: various filter tanks, activated carbon adsorption filtration, ion exchange and the like, and an advanced oxidation method: ozone oxidation, fenton, plasma oxidation, electrolysis, and the like. In practical application, different combinations are adopted according to different types of sewage and the treated discharge standard.
Most domestic sewage is sewage containing oil or other pollutants capable of being separated by flotation, and air flotation is mostly used as a pretreatment process, and the pretreated domestic sewage enters a biochemical and subsequent advanced treatment process. The air flotation mainly adopts dissolved air flotation, cavitation air flotation or shallow layer air flotation and the like. The effluent of the air floatation enters an anaerobic or aerobic biochemical system, is mixed with activated sludge to reduce pollution indexes such as COD (chemical oxygen demand), BOD (biochemical oxygen demand) and the like, and finally enters a secondary sedimentation tank or MBR (membrane bioreactor) for carrying out sludge-water separation and then is discharged or further subjected to advanced treatment.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention aims to provide a combined device and process for sewage treatment.
The technical scheme adopted by the invention is as follows:
a device applied to sewage treatment comprises a sewage treatment body and a dissolved air tank, wherein an air flotation region, an aerobic biochemical filler region and an MBR membrane treatment region are sequentially arranged in the sewage treatment body, and the air flotation region, the aerobic biochemical filler region and the upper end of the MBR membrane treatment region are sequentially communicated;
the water outlet end of the MBR membrane treatment area and an externally connected compressed air pipeline are respectively connected with the inlet end of the dissolved air tank;
the outlet end of the dissolved air tank is connected with the bottom end of the air floating area.
Furthermore, the MBR membrane treatment device also comprises a water storage tank, and the water outlet end of the MBR membrane treatment area is communicated with the water storage tank through a water outlet pump.
Furthermore, the water outlet end of the water storage tank is connected with the inlet end of the dissolved air tank through an air dissolved water pump.
Furthermore, a first dissolved air releaser is arranged at the lower end of the air floatation zone, and the formed dissolved air water is released from bottom to top in the air floatation zone through the first dissolved air releaser, so that the dissolved oxygen content in the aerobic zone is more than or equal to 2 mg/L.
Furthermore, a second dissolved air releaser is arranged at the lower end of the aerobic biochemical filler area, and the formed dissolved air water is released from bottom to top in the aerobic biochemical filler area through the second dissolved air releaser.
Further, the aerobic biochemical filter also comprises a first clapboard, and the air flotation area and the aerobic biochemical filler area are separated by the first clapboard.
Further, the device also comprises a second clapboard, and the aerobic biochemical filler area and the MBR membrane treatment area are separated by the second clapboard.
The invention also discloses a process for treating sewage by using the device applied to sewage treatment, which comprises the following steps:
(1) sewage enters the sewage treatment body and is treated by the air flotation zone, the aerobic biochemical filler zone and the MBR membrane treatment zone in sequence;
(2) and part of the effluent of the MBR membrane treatment area is conveyed to the dissolved air tank, and forms dissolved air water with the compressed air conveyed to the dissolved air tank, and the formed dissolved air water is released from bottom to top in the air flotation area to float the floatable pollutants in the sewage.
Furthermore, the water amount of the dissolved air water entering the air flotation area is 50-60% of the water inlet flow of the sewage inlet of the sewage treatment body.
The invention has the beneficial effects that:
the process of the invention is a combined process combining air flotation, aerobic biochemistry and MBR process, sewage enters an air flotation area after being collected, dissolved air water in the air flotation area is released from the bottom to the top, and is mixed with the sewage to float and select suspended matters, grease and the like in the sewage, formed scum can be scraped by a scum scraper and is discharged from a scum collecting tank, part of effluent water of an MBR membrane treatment area is used as a source of the dissolved air water in the air flotation area, and the condition that a releaser of the air flotation is blocked because the effluent water of the air flotation is directly used as the dissolved air water of the air flotation is avoided; in addition, because the dissolved oxygen in the sewage is increased in the air floatation process, the aeration quantity required by the aerobic biochemical filler area is saved, and the energy consumption in the sewage treatment process is also saved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 10-sewage treatment body; 11-an air flotation zone; 12-aerobic biochemical filler area; 121-biofilm filler layer; 13-MBR membrane treatment area; 20-a water storage tank; 21-water outlet pipe; 30-dissolved air tank; 41-water outlet pump; 42-dissolved air water pump; 51-a first releaser; 52-a second releaser; 61-a first separator; 62-a second separator; 63-a third separator; 71-a slag scraper; 72-a scum collection tank; 81-a first flow control valve; 82-a second flow control valve; 83-third flow control valve; 84-a fourth flow control valve; 85-a fifth flow control valve; 86-a sixth flow control valve; 91-compressed air pipes; 92-a fan.
Detailed Description
The invention is further explained below with reference to the drawings and the specific embodiments.
Example 1:
the embodiment provides a be applied to sewage treatment's device includes sewage treatment body 10 and dissolves gas pitcher 30, this internal air supporting district 11, good oxygen biochemical filler district 12 and MBR membrane treatment zone 13 of being equipped with in proper order of sewage treatment, the air supporting district good oxygen biochemical filler district with the upper end in MBR membrane treatment zone communicates in proper order, and air supporting district 11, good oxygen biochemical filler district 12 and MBR membrane treatment zone 13 each distinguish independently but communicate in proper order, and sewage gets into sewage treatment this internal, handles via air supporting district, good oxygen biochemical filler district and MBR membrane treatment zone in proper order.
The air flotation zone 11 and the aerobic biochemical filler zone 12 are separated by the first partition board 61, the lower end of the first partition board 61 is integrally connected with the inner wall of the sewage treatment body 10, and the upper end of the first partition board 61 is separated from the upper end of the sewage treatment body by a certain distance, so that only the upper ends of the air flotation zone 11 and the aerobic biochemical filler zone 12 are communicated. The aerobic biochemical filler zone 12 and the MBR membrane treatment zone 13 are separated by the second partition plate 62, and similarly, the aerobic biochemical filler zone 12 and the MBR membrane treatment zone 13 are only communicated at the upper ends by the separation of the second partition plate 62. The left side of the second clapboard is also provided with a third clapboard 63, the upper end of the third clapboard 63 is integrally connected with the inner wall of the sewage treatment body 10, and the lower end of the third clapboard is not contacted with the lower end of the sewage treatment body 10, so that the retention time of sewage flowing from the aerobic biochemical filler zone 12 to the MBR membrane treatment zone 13 is prolonged, and the sewage treatment effect is improved.
The water outlet end of the MBR membrane treatment area and an externally connected compressed air pipeline are respectively connected with the inlet end of the dissolved air tank; the outlet end of the dissolved air tank is connected with the bottom end of the air floating area. And part of effluent of the MBR membrane treatment area can be conveyed to the dissolved air tank, and forms dissolved air water together with compressed air conveyed into the dissolved air tank, and the formed dissolved air water is released from bottom to top in the air flotation area. A first dissolved air releaser 51 (model TJ or TV type dissolved air releaser) may be provided at the lower end of the air flotation zone, and the formed dissolved air water is released from the bottom to the top in the air flotation zone through the first dissolved air releaser 51. Sewage enters an air floatation area after being collected, dissolved air water is released from bottom to top in the air floatation area through a first dissolved air releaser, the released dissolved air water is mixed with the sewage in the air floatation area to float and select floatable pollutants such as suspended matters, grease and the like in the sewage, the floatable pollutants are floated and selected to form scum, the scum is scraped through a scum scraper 71 (the model is TJ or TV type dissolved air releaser), and the scum is discharged from a scum collecting tank 72 (the scum collecting tank 72 is positioned below the outlet end of the scum scraper).
A second dissolved air releaser 52 (the model is TJ or TV type dissolved air releaser) can be arranged at the lower end of the aerobic biochemical filler zone, and the formed dissolved air water is released from bottom to top in the aerobic biochemical filler zone through the second dissolved air releaser 52. The dissolved air water provides dissolved oxygen required by decomposition reaction for the aerobic biochemical filler zone at the rear end of the air floatation through the second dissolved air releaser 52. The aerobic biochemical filler area adopts a contact oxidation method, a biomembrane filler layer 121 is arranged in the aerobic biochemical filler area, the second dissolved air releaser 52 is arranged below the biomembrane filler layer 121, and the second dissolved air releaser 52 is used for providing dissolved oxygen for the biomembrane filler layer 121 so as to adjust the dissolved oxygen in the area.
An MBR membrane treatment area 13 is arranged behind the aerobic biochemical filler area 12, the MBR membrane treatment area 13 adopts an immersed MBR ultrafiltration membrane, and is matched with an independent air washing, backwashing and chemical cleaning system. The MBR membrane treatment zone 13 employs a separate aeration system, and a blower 92 or compressed air is used to aerate the lower end of the MBR membrane treatment zone 13. The effluent (clean water) treated by the MBR membrane treatment zone is pumped to the water storage tank 20 by the effluent pump 41 (because the water outlet end of the MBR membrane treatment zone is communicated with the water storage tank by the effluent pump), and the clean water in the water storage tank 20 is pumped into the dissolved air tank 30 by the dissolved air pump 42 according to the requirement of the emission standard (because the water outlet end of the water storage tank is connected with the inlet end of the dissolved air tank by the dissolved air pump 42), and the other part is discharged or further deeply treated by the water outlet pipe 21. Part of effluent of the MBR membrane treatment area is conveyed to the dissolved air tank, and forms dissolved air water with compressed air conveyed to the dissolved air tank, and the formed dissolved air water can be released from bottom to top in the air flotation area through the first dissolved air releaser to float floatable pollutants in sewage; dissolved oxygen may also be provided to the biofilm filler layer 121.
The invention also discloses a process for treating sewage by using the device applied to sewage treatment, which comprises the following steps:
(1) sewage enters the sewage treatment body and is treated by the air flotation zone, the aerobic biochemical filler zone and the MBR membrane treatment zone in sequence;
(2) and part of the effluent of the MBR membrane treatment area is conveyed to the dissolved air tank, and forms dissolved air water with the compressed air conveyed to the dissolved air tank, and the formed dissolved air water is released from bottom to top in the air flotation area to float the floatable pollutants in the sewage.
In the above scheme, sewage enters the sewage treatment body from the sewage inlet 101, and is firstly mixed with dissolved air water in the air flotation area, and floatable pollutants such as suspended matters, hydrophobic groups and the like in the sewage are floated out through micro bubbles in the dissolved air water released by the first dissolved air releaser to form scum. In the process, a first flow control valve 81 is arranged between the dissolved air tank 30 and the first dissolved air releaser 51, and the water yield of the dissolved air water entering the air flotation zone is controlled by controlling the water yield of the first flow control valve, so that the water yield of the dissolved air water entering the air flotation zone is ensured to be 50-60% of the water inlet flow of the sewage inlet of the sewage treatment body.
A second flow control valve 82 is arranged between the dissolved air tank 30 and the second dissolved air releaser 52, the content of Dissolved Oxygen (DO) in the aerobic biochemical filler zone 12 is controlled to be more than or equal to 2 mg/L by controlling the water output of the second flow control valve, when the dissolved oxygen in the aerobic biochemical filler zone 12 is insufficient, the second dissolved air releaser at the lower end of the aerobic biochemical filler zone 12 is opened, and simultaneously the water output supplied to the dissolved air tank by the dissolved air pump can be increased (a third flow control valve 83 is arranged on a pipeline between the dissolved air pump 42 and the dissolved air tank 30, the water output supplied to the dissolved air tank by the dissolved air pump can be increased by adjusting the third flow control valve 83) and the air input of the compressed air (as shown in fig. 1, the dissolved air tank 30 is externally connected with a compressed air pipeline 91, a fourth flow control valve 84 is arranged on the compressed air pipeline 91, and the air input of the compressed air can be adjusted by adjusting the fourth flow control valve 84.
In the above solution, a fifth flow control valve 85 is disposed between the water outlet pump and the water storage tank 20, and the water outlet flow of the water outlet pump 41 is controlled by the fifth flow control valve, so as to control the liquid level height of the air flotation region, thereby achieving the effect of adjusting the height of scum scraping.
The sewage inlet 101 is adjusted to have the same sewage inlet amount as the MBR membrane treatment area (the sixth flow control valve 86 is arranged on the water outlet pipe of the MBR membrane treatment area, and the water outlet amount of the MBR membrane treatment area is adjusted through the sixth flow control valve 86), so that the liquid level height of the sewage treatment body 10 is kept unchanged. And a liquid level switch is arranged in the air flotation zone, under the condition of low liquid level, the water outlet pump 41 is not started, the water outlet pump is started after the liquid level height is controlled, and the sixth flow control valve 86 is controlled to control the water yield of the MBR membrane treatment zone, so that the water flow rate is balanced.
In the scheme, the total dissolved air water amount is 50-60% of the water inlet flow of the sewage inlet, wherein the dissolved air water amount distributed to the first dissolved air releaser is 50-75% of the total dissolved air water amount, and the dissolved air water amount distributed to the second dissolved air releaser is 25-50% of the total dissolved air water amount.
The effective water depth in the air flotation zone is 2.0-3.0m, the included angle between the first partition plate 61 and the horizontal direction is 60-75 degrees, the maximum distance between the top of the first partition plate 61 and the liquid level in the sewage treatment body 10 is 30-50cm, and the total retention time HRT (hydraulic retention time) of the mixing zone is more than or equal to 3 min.
After the contact oxidation debugging is finished, the concentration of the activated sludge in the aerobic biochemical filler zone 12 is 2.0-3.5 g/L, and the volume load of the aerobic biochemical filler zone 12 is 3-5KgBOD5/m3d。
In the scheme, the water yield of the MBR membrane treatment area is 160-180% of the sewage inflow of the sewage inlet 101, and the matched fan, the water outlet pump and the like are correspondingly configured according to 160-180% of the sewage inflow of the sewage inlet 101. The benefit of this configuration here is: ensuring 50% of reflux.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (9)
1. The utility model provides a be applied to sewage treatment's device which characterized in that: the sewage treatment device comprises a sewage treatment body and a dissolved air tank, wherein an air flotation region, an aerobic biochemical filler region and an MBR membrane treatment region are sequentially arranged in the sewage treatment body, and the air flotation region, the aerobic biochemical filler region and the upper end of the MBR membrane treatment region are sequentially communicated;
the water outlet end of the MBR membrane treatment area and an externally connected compressed air pipeline are respectively connected with the inlet end of the dissolved air tank;
the outlet end of the dissolved air tank is connected with the bottom end of the air floating area.
2. The apparatus for wastewater treatment according to claim 1, wherein: the MBR membrane treatment device is characterized by further comprising a water storage tank, wherein the water outlet end of the MBR membrane treatment area is communicated with the water storage tank through a water outlet pump.
3. The apparatus for wastewater treatment according to claim 2, wherein: the water outlet end of the water storage tank is connected with the inlet end of the dissolved air tank through an air dissolving water pump.
4. The apparatus for wastewater treatment according to claim 3, wherein: the lower extreme in air supporting district is equipped with first dissolved air releaser, and the dissolved air water that forms passes through first dissolved air releaser is in from lower to upper release in the air supporting district.
5. The device for sewage treatment according to claim 4, wherein the lower end of the aerobic biochemical filler zone is provided with a second dissolved air releaser, and the formed dissolved air water is released from bottom to top in the aerobic biochemical filler zone through the second dissolved air releaser, so that the dissolved oxygen content in the aerobic zone is more than or equal to 2 mg/L.
6. The apparatus for wastewater treatment according to any of claims 1-5, wherein: the aerobic biochemical filler zone is arranged in the aerobic biochemical filler zone, and the aerobic biochemical filler zone is arranged in the aerobic biochemical filler zone.
7. The apparatus for wastewater treatment according to claim 6, wherein: the aerobic biochemical filler area and the MBR membrane treatment area are separated by the second clapboard.
8. A process for sewage treatment using the apparatus for sewage treatment according to claim 7, comprising the steps of:
(1) sewage enters the sewage treatment body and is treated by the air flotation zone, the aerobic biochemical filler zone and the MBR membrane treatment zone in sequence;
(2) and part of the effluent of the MBR membrane treatment area is conveyed to the dissolved air tank, and forms dissolved air water with the compressed air conveyed to the dissolved air tank, and the formed dissolved air water is released from bottom to top in the air flotation area to float the floatable pollutants in the sewage.
9. The process of claim 8, wherein: the water amount of the dissolved air water entering the air flotation area is 50-60% of the water inlet flow of the sewage inlet of the sewage treatment body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010091441.2A CN111453917A (en) | 2020-02-13 | 2020-02-13 | Device and process applied to sewage treatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010091441.2A CN111453917A (en) | 2020-02-13 | 2020-02-13 | Device and process applied to sewage treatment |
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| CN111453917A true CN111453917A (en) | 2020-07-28 |
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| CN202010091441.2A Pending CN111453917A (en) | 2020-02-13 | 2020-02-13 | Device and process applied to sewage treatment |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2780741Y (en) * | 2005-03-04 | 2006-05-17 | 邵英倚 | Integral sewage treatment equipment |
| CN103043853A (en) * | 2012-12-14 | 2013-04-17 | 蓝星环境工程有限公司 | Advanced treatment process and device for sewage |
| CN206736023U (en) * | 2017-04-20 | 2017-12-12 | 成都孚华环保科技有限公司 | L-type flow-guiding type SSMBBR integrated sewage treating apparatus |
| CN207713585U (en) * | 2017-11-23 | 2018-08-10 | 沈阳工业大学 | A kind of small-sized integrated processing equipment of northern country sanitary sewage |
| CN208980542U (en) * | 2018-10-10 | 2019-06-14 | 江苏华达环境工程有限公司 | Coating wastewater integrated equipment for wastewater treatment |
-
2020
- 2020-02-13 CN CN202010091441.2A patent/CN111453917A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2780741Y (en) * | 2005-03-04 | 2006-05-17 | 邵英倚 | Integral sewage treatment equipment |
| CN103043853A (en) * | 2012-12-14 | 2013-04-17 | 蓝星环境工程有限公司 | Advanced treatment process and device for sewage |
| CN206736023U (en) * | 2017-04-20 | 2017-12-12 | 成都孚华环保科技有限公司 | L-type flow-guiding type SSMBBR integrated sewage treating apparatus |
| CN207713585U (en) * | 2017-11-23 | 2018-08-10 | 沈阳工业大学 | A kind of small-sized integrated processing equipment of northern country sanitary sewage |
| CN208980542U (en) * | 2018-10-10 | 2019-06-14 | 江苏华达环境工程有限公司 | Coating wastewater integrated equipment for wastewater treatment |
Non-Patent Citations (1)
| Title |
|---|
| 陈群玉，高红主编: "《水污染控制工程》", 30 June 2018, 中央民族大学出版社 * |
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