CN109569265B - Waste gas and waste water treatment device - Google Patents

Waste gas and waste water treatment device Download PDF

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CN109569265B
CN109569265B CN201710898674.1A CN201710898674A CN109569265B CN 109569265 B CN109569265 B CN 109569265B CN 201710898674 A CN201710898674 A CN 201710898674A CN 109569265 B CN109569265 B CN 109569265B
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reactor
waste gas
reaction section
treatment reactor
wastewater
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CN109569265A (en
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高峰
赵锐
马欣
杨宇宁
曹晓磊
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Sinopec Research Institute of Petroleum Processing
China Petroleum and Chemical Corp
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Sinopec Research Institute of Petroleum Processing
China Petroleum and Chemical Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84—Biological processes
    • 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
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
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  • Biodiversity & Conservation Biology (AREA)
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  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention relates to waste gas and wastewater treatment, and discloses a waste gas and wastewater treatment device, which comprises a waste gas treatment reactor (1) and a wastewater treatment reactor (2); the waste gas treatment reactor (1) comprises a first reaction section (I), a second reaction section (II) and a third reaction section (III), wherein the flow area of the first reaction section (I) is larger than that of the third reaction section (III), and the flow area of the second reaction section (II) is gradually reduced from the first reaction section (I) to the third reaction section (III); the waste gas treatment reactor (1) is also provided with a waste gas inlet (10) and a water inlet (11); the treatment plant also comprises a lower filter material pipe (3) for guiding the BAF filter material from the waste water treatment reactor (2) into the waste gas treatment reactor (1), and an upper filter material pipe (4) for circulating the BAF filter material from the waste gas treatment reactor (1) back into the waste water treatment reactor (2). The treatment device provided by the invention can organically combine wastewater treatment and waste gas treatment, and realizes the treatment of wastewater and waste gas on one set of BAF device.

Description

Waste gas and waste water treatment device
Technical Field
The invention relates to the field of waste gas and wastewater treatment, in particular to a waste gas and wastewater treatment device.
Background
A Biological Aerated Filter (BAF) is a novel sewage treatment process by a biofilm method, which is developed in Europe and America at the end of the 80 s. The process has the functions of removing SS, COD, BOD, nitration, denitrification, dephosphorization and removing AOX (harmful substances), and is characterized by integrating biological oxidation and suspended solid interception, saving a subsequent sedimentation tank (secondary sedimentation tank), having large volume load and hydraulic load, short hydraulic retention time, less required capital investment, good effluent quality, low operation energy consumption and low operation cost.
Compared with the common activated sludge method, the biological aerated filter (biologicalatedfilter) has the advantages of high organic load, small occupied area (1/3 of the common activated sludge method), less investment (saving 30%), no sludge expansion, high oxygen transmission efficiency, good effluent quality and the like.
Due to the advantages of the biological aerated filter, extensive research and attention have been paid, such as: CN201358204Y relates to an EM-BAF treatment device for oil refining sewage advanced treatment, which has the advantages of tolerance to the impact of pollutant concentration change, high microorganism load and less sludge production. However, in the practical application process, BAF has the defects of large quantity of backwashing water and large head loss required for treating wastewater with high concentration.
Industrial waste gases often include Volatile Organic Compounds (VOCs) such as hydrocarbons, and malodorous gases such as hydrogen sulfide, organic sulfur, and ammonia. Besides making people feel uncomfortable, malodorous gas has great harm to human bodies. Volatile Organic Compounds (VOCs) are organic compounds having a saturated vapor pressure of greater than about 70Pa at ambient temperature and a boiling point of less than 250 ℃ at ambient pressure. The pollutants including alkane, arene, olefin, alcohol, ether and the like are the most common pollutants discharged by the petrochemical industry and have great destructive effect on the environment.
With the increasing public awareness of environmental protection and the stricter environmental emission standards, the environmental pollution caused by waste gas is more and more paid attention by people. In order to protect the health of personnel and improve the air quality, it is necessary to effectively treat the waste gas of industrial enterprises.
At present, the treatment research on waste gas mostly focuses on biological treatment, adsorption treatment, catalytic combustion treatment and the like, wherein the biological treatment technology mainly adopts a biological filler technology.
Such as: CN1745883A discloses a method for treating foul smell pollution, especially foul smell pollution emitted from petrochemical sewage treatment plant and a method for purifying low-concentration organic waste gas, wherein the method adopts immobilized microbial film filler and 1-3 level microbial treatment, a wet dust removal tower can be used for pretreatment before the microbial treatment, and an adsorbent can be used for advanced treatment after the microbial treatment. Compared with the prior art, the method has the advantages of low operation cost, high purification rate, stable operation, impact resistance, long operation period and the like. However, the method can only treat waste gas and cannot treat waste water.
The prior art can only treat waste water or waste gas alone usually, has the technical defects of long treatment process and large occupied area, and the prior BAF technology has the technical defect of needing timing back flush, so that a comprehensive treatment device for waste water and waste gas with simple operation needs to be developed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a treatment device which can treat waste gas and waste water simultaneously and does not need backwashing.
In order to achieve the above object, the present invention provides an exhaust gas and wastewater treatment apparatus, wherein the treatment apparatus comprises an exhaust gas treatment reactor and a wastewater treatment reactor;
the waste gas treatment reactor comprises from top to bottom: the flow area of the first reaction section is larger than that of the third reaction section, the second reaction section is a transition reaction section between the first reaction section and the third reaction section, and the flow area of the second reaction section is gradually reduced from the first reaction section to the third reaction section; the waste gas treatment reactor is also provided with a waste gas inlet and a water inlet which are respectively communicated with the third reaction section;
the wastewater treatment reactor is a BAF reactor;
the treatment device also comprises a lower filter material pipe used for guiding the BAF filter material from the waste water treatment reactor into the waste gas treatment reactor for waste gas treatment, and an upper filter material pipe used for circulating the BAF filter material from the waste gas treatment reactor back to the waste water treatment reactor after waste gas treatment.
The treatment device provided by the invention can organically combine wastewater treatment and waste gas treatment, and realizes the treatment of wastewater and waste gas on one set of BAF device. The BAF filter material can circularly flow in the treatment process, so that hardening is avoided. The aged microbial membrane on the filter material can fall off under the scouring of gas and water flow at the lower part of the waste gas treatment reactor, thereby avoiding the timing back washing of BAF and being beneficial to the continuous operation of the device and the improvement of the treatment effect.
Drawings
FIG. 1 is a schematic view of an apparatus for treating exhaust gas and wastewater according to an embodiment of the present invention.
Description of the reference numerals
1 waste gas processor 2 waste gas processor
3 lower filter tube and 4 upper filter tube
5 waste water inlet 6 air inlet
7 second aeration device 8 second water outlet
9 second air outlet 10 waste gas inlet
11 water inlet 12 first air outlet
13 first water outlet 14 first aeration device
15 BAF filter material
I a first reaction section and II a second reaction section
III third reaction stage
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In the present invention, the terms of orientation such as "upper and lower" are used to mean generally upper and lower along the height direction of the reactor, unless otherwise specified.
According to the present invention, as shown in fig. 1, the exhaust gas and wastewater treatment apparatus includes an exhaust gas treatment reactor 1 and a wastewater treatment reactor 2;
wherein, the waste gas treatment reactor 1 comprises from top to bottom: the flow area of the first reaction section I is larger than that of the third reaction section III, the second reaction section II is a transition reaction section between the first reaction section I and the third reaction section III, and the flow area of the second reaction section II is gradually reduced from the first reaction section I to the third reaction section III; the waste gas treatment reactor 1 is also provided with a waste gas inlet 10 and a water inlet 11 which are respectively communicated with the third reaction section III;
the wastewater treatment reactor 2 is a BAF reactor;
the treatment device also comprises a lower filter material pipe 3 used for leading the BAF filter material from the waste water treatment reactor 2 into the waste gas treatment reactor 1 for waste gas treatment, and an upper filter material pipe 4 used for circulating the BAF filter material from the waste gas treatment reactor 1 back to the waste water treatment reactor 2 after waste gas treatment.
According to a specific embodiment of the present invention, the discharge end of the lower filter material pipe 3 is located higher than the feed end thereof from the viewpoint of facilitating introduction of BAF filter material from the wastewater treatment reactor 2 into the exhaust gas treatment reactor 1 for exhaust gas treatment. It is further preferable that the discharge end of the lower filter material pipe 3 is located at the lower portion of the waste water treatment reactor 2, and more preferably, at a vertical distance of 2-200mm from the bottom of the waste water treatment reactor 2, in order to ensure that the BAF filter material can be smoothly introduced into the waste gas treatment reactor 1 under a certain pressure, and that the feed end of the lower filter material pipe 3 is located at the lower portion of the third reaction section iii of the waste gas treatment reactor 1, and more preferably, at a vertical distance of 2-200mm from the bottom of the waste gas treatment reactor 1, in order to ensure that the BAF filter material can be easily removed from the aged microbial membrane on the BAF filter material by the air and water rushing in the waste gas treatment reactor 1.
According to an embodiment of the invention, the discharge end of the upper filter material pipe 4 is located higher than the feed end thereof, from the viewpoint of facilitating the circulation of BAF filter material from the exhaust gas treatment reactor 1 back to the wastewater treatment reactor 2 after the exhaust gas treatment. Preferably, in order to easily return the BAF filter material to the wastewater treatment reactor 2, the discharge end of the upper filter material pipe 4 is located at the second reaction section ii and/or the third reaction section iii of the exhaust gas treatment reactor 1, more preferably at the third reaction section iii of the exhaust gas treatment reactor 1, and the height of the filter material layer located above the discharge end of the upper filter material pipe 4 is at least 5mm, preferably 5-100mm, and in order to ensure that the filter material layer in the wastewater treatment reactor 2 has a certain height, the feed end of the upper filter material pipe 4 is located at the upper part of the wastewater treatment reactor 2, more preferably 10-500mm, perpendicular to the top of the wastewater treatment reactor 2.
Further, in order to ensure that the BAF filter material can circulate in the wastewater treatment reactor 2 and the waste gas treatment reactor 1, it is preferable that the bottom of the wastewater treatment reactor 2 is higher than the bottom of the waste gas treatment reactor 1, and the top of the wastewater treatment reactor 2 is lower than the top of the waste gas treatment reactor 1 in the present invention.
According to the present invention, preferably, in order to better achieve the object of the present invention, the first reaction section i of the waste gas treatment reactor 1 is cylindrical, the ratio of the diameter to the height of the first reaction section i is 0.1-5:1, and the height of the first reaction section i is 3-30% of the vertical distance from the top of the waste gas treatment reactor 1 to the bottom of the reactor;
the second reaction section II is in an inverted truncated cone shape, the cross sectional area of the upper end of the second reaction section II is equal to that of the first reaction section I, the cross sectional area of the lower end of the second reaction section II is equal to that of the third reaction section III, and the height of the second reaction section II is 3-30% of the vertical distance from the top of the waste gas treatment reactor 1 to the bottom of the reactor;
the third reaction section III is cylindrical, the diameter-height ratio of the third reaction section III is 0.02-0.5:1, and the height of the third reaction section III is 40-94% of the vertical distance from the top of the waste gas treatment reactor 1 to the bottom of the reactor.
In the third reaction section III of the waste gas treatment reactor 1, the BAF filter material flows upwards under the action of waste gas and waste water to form a suspended bed state, and the aged microbial membrane on the filter material can fall off under the washing of gas and water flow, so that the BAF filter material is prevented from regularly backflushing, continuously flows to the second reaction section II and the first reaction section I, and gradually increases the flow area (preferably the diameter of the reaction section gradually increases), the water flow and the gas speed are reduced, the BAF filter material is gradually in a fixed bed state, and part of the BAF filter material returns to the upper part of the waste water treatment reactor 2 from the upper filter material pipe 4. Therefore, the flow area of the third reaction section III is smaller than that of the first reaction section I, and the flow area of the second reaction section II is gradually reduced from the first reaction section I to the third reaction section III, so that the BAF filter material is ensured to be gradually transited from a suspended bed state to a fixed bed state.
Further preferably, the ratio of the third reaction section III to the first reaction section I is 1:1.5-100, and more preferably 1:3-10, so as to further ensure the sufficient flushing and waste gas treatment effects of the BAF filter material in the third reaction section III and ensure that the BAF filter material gradually forms a fixed bed state in the first reaction section I and/or the second reaction section II.
According to a specific embodiment of the invention, from the perspective of facilitating conveying of BAF filter materials, the lower filter material pipe 3 and the upper filter material pipe 4 are both circular pipes, the wastewater treatment reactor 2 is a cylindrical BAF reactor, the body of the wastewater treatment reactor is a cylinder, preferably, a proper amount of BAF filter materials are guided into the exhaust gas treatment reactor 1 from the wastewater treatment reactor 2, so that not only can effective treatment of wastewater in the wastewater treatment reactor 2 be ensured, but also a part of BAF filler is conveyed into the exhaust gas reactor 1 for effective treatment of exhaust gas, and washing of the filter materials is completed at the same time, and the diameter ratio of the diameter of the lower filter material pipe 3 to the diameter of the wastewater treatment reactor 2 is 0.01-0.5: 1; the diameter ratio of the diameter of the upper filter pipe 4 to the wastewater treatment reactor 2 is 0.01-0.5: 1.
Preferably, in order to ensure that the incoming exhaust gas and the incoming water can sufficiently stir the BAF filter material in the exhaust gas treatment reactor 1 to flush the filter material, the water inlet 11 is arranged at a vertical distance of 5-50mm from the bottom of the exhaust gas treatment reactor 1. Further, the waste gas treatment reactor 1 is further provided with a first gas outlet 12 and a first water outlet 13 which are located in the first reaction section i, preferably, in order to facilitate discharging the treated gas and the treated effluent, the first gas outlet 12 is arranged at the upper part and/or the top of the reactor, and the first water outlet 13 is arranged at the upper part and/or the top of the first reaction section i of the reactor. The waste gas treatment reactor 1 is further provided with a first aeration device 14 which is used for uniformly distributing waste gas to be treated and then entering the treatment reactor, the first aeration device 14 is arranged at the bottom of the reactor, and the waste gas inlet 10 is communicated with the waste gas treatment reactor 1 through the first aeration device 14.
According to the invention, the wastewater treatment reactor 2 is a BAF cylindrical reactor. Other conventional structures and functions of the BAF reactor, in addition to the filter media piping and other related structures associated with the BAF filter media recycling of the present invention, are known to those skilled in the art.
According to the present invention, further, the wastewater treatment reactor 2 is further provided with a wastewater inlet 5, a second aeration device 7 and an air inlet 6, the wastewater inlet 5 is arranged at the lower part of the reactor, the second aeration device 7 and the air inlet 6 are arranged at the bottom of the reactor, and the air inlet 6 is communicated with the wastewater treatment reactor 2 through the second aeration device 7 so as to uniformly distribute air contacting with wastewater and then enter the treatment reactor. The wastewater treatment reactor 2 is further provided with a second water outlet 8 and a second gas outlet 9, in order to facilitate discharging of treated wastewater and generated gas, the second water outlet 8 is arranged at the upper part and/or the top of the reactor, and the second gas outlet 9 is arranged at the upper part and/or the top of the reactor.
According to an embodiment of the present invention, it is preferable that after the waste gas treatment, a part of waste water may be generated, and in order to further ensure the treatment effect and the environment-friendly requirement, the first water outlet 13 of the waste gas treatment reactor 1 is communicated with the waste water inlet 5 of the waste water treatment reactor 2, so as to send the waste water generated by the waste gas treatment reactor 1 into the waste water treatment reactor 2 for recycling treatment. In order to further ensure the recycling of water, the second water outlet 8 of the wastewater treatment reactor 2 is communicated with the water inlet 11 of the waste gas treatment reactor 1, so that the water after wastewater treatment is introduced into the waste gas treatment reactor 1 for recycling.
According to an embodiment of the present invention, after the wastewater treatment, a part of the waste gas may be generated, and in order to further ensure the treatment effect, the second outlet 9 of the wastewater treatment reactor 2 is preferably communicated with the waste gas inlet 10 of the waste gas treatment reactor 1, so that the waste gas generated by the wastewater treatment reactor 2 is sent to the waste gas treatment reactor 1 for recycling treatment.
According to an embodiment of the present invention, the first outlet 12 of the waste gas treatment reactor 1 is communicated with the second outlet 9 of the waste water treatment reactor 2 in order to facilitate the exhaust gases generated by the two reactors to be led out together or to be reprocessed.
It is further preferable that both the exhaust gas treatment reactor 1 and the wastewater treatment reactor 2 are filled with BAF filter material 15 to better ensure the flow circulation state of the filter material.
The following describes in further detail an embodiment of the present invention with reference to fig. 1.
Wastewater to be treated enters the wastewater treatment reactor 2 from the wastewater inlet 5, air is introduced into the wastewater treatment reactor 2 from the air inlet 6 through the aeration device 7, the wastewater and air and a biological membrane on a fixed BAF filter material 15 in the wastewater treatment reactor 2 are subjected to aerobic reaction, COD, ammonia nitrogen and other pollutants in the water are removed, and then the wastewater is discharged from the second water outlet 8. Part of the BAF filter material 15 at the bottom of the wastewater treatment reactor 2 enters the bottom of the exhaust gas reactor 1 through the lower filter material pipe 3. Preferably, the second water outlet 8 of the wastewater treatment reactor 2 is communicated with the water inlet 11 of the waste gas treatment reactor 1; the second air outlet 9 of the wastewater treatment reactor 2 is communicated with the waste gas inlet of the waste gas treatment reactor 1; the water outlet 13 of the waste gas treatment reactor 1 is communicated with the waste water inlet 5 of the waste water treatment reactor 2.
Waste gas to be treated and waste gas discharged from a second gas outlet 9 at the top of the waste water treatment reactor 2 are distributed through a waste gas inlet 10 through a first aeration device 14 and then enter the waste gas treatment reactor 1, and effluent discharged from the waste water treatment reactor 2 enters the waste gas treatment reactor 1 from a water inlet 11. In the third reaction section III at the lower part of the waste gas treatment reactor 1, the BAF filter material flows upwards under the action of waste gas and waste water to form a suspended bed state, in the upper part of the reactor, from the second reaction section II to the first reaction section I, along with the increase of the diameter of the reactor, the water flow and the gas velocity are slowed down, the BAF filter material is in a fixed bed state, and part of the BAF filter material returns to the upper part of the waste water reactor 2 from the upper filter material pipe 4. After harmful substances in the waste gas are decomposed by the biological membrane on the BAF filter material, the waste gas is led out from a first gas outlet 12 of the waste gas treatment reactor 1. The wastewater discharged from the waste gas treatment reactor 1 is discharged from the first water outlet 13 to be mixed with the wastewater to be treated, and then enters the wastewater treatment reactor 2 through the wastewater inlet 5.
The invention organically combines the wastewater treatment and the waste gas treatment, and can realize the treatment of the wastewater and the waste gas on a set of BAF device. The BAF filter material can circularly flow in the treatment process, hardening is avoided, the aged microbial membrane on the filter material can fall off under the scouring of gas and water flow at the lower part of the waste gas treatment reactor 1, the regular backwashing of the BAF is avoided, and the continuous operation of the device and the improvement of the treatment effect are facilitated.
The present invention will be described in detail below by way of examples.
In the following embodiments, COD of the waste water from a petrochemical plant is 120-250mg/L, and the content of hydrogen sulfide in the waste gas from a petrochemical plant is 5-28mg/m3The ammonia content is 15-95mg/m3The benzene content is 8-45mg/m3The toluene content is 23-91mg/m3The non-methane total hydrocarbon content is 187-478mg/m3。
In the following examples, the BAF filter material used was a spherical activated carbon filter material having a diameter of 3-5mm (available from korotkoff environment).
Example 1
As shown in FIG. 1, the waste water and waste gas treatment apparatus is used to treat waste water and waste gas of a petrochemical plant.
The diameter of the third reaction section III at the middle lower part of the waste gas treatment reactor 1 is 100mm, the height is 1.5m, the height of the second reaction section II in transition is 300mm, the diameter of the first reaction section I is 500mm, the height is 200mm, and the volume space velocity of waste gas is 200h-1The ratio of gas to water is 100: 1. The vertical distance between the position of the water inlet 11 and the bottom of the waste gas treatment reactor 1 is 5 mm.
The wastewater treatment reactor 2 was a BAF cylindrical reactor having a diameter of 300mm and a height of 1 m. In the wastewater treatment reactor 2, the retention time of wastewater is 20 hours, and the gas-water ratio is 3: 1.
The waste gas and wastewater treatment device also comprises an upper filter material pipe 4 and a lower filter material pipe 3.
The upper filter tube 4 is a round tube with the diameter of 10 mm. The position of the discharge end of the upper filter material pipe 4 is higher than that of the feed end thereof. The discharge end of the upper filter tube 4 is positioned at the third reaction section III of the waste gas treatment reactor 1 (and ensures that the height of a filter material layer positioned above the discharge end of the upper filter tube 4 after the circulation work is started is 100mm), the feed end of the upper filter tube 4 is positioned at the upper part of the waste water treatment reactor 2, and the vertical distance between the feed end of the upper filter tube 4 and the top of the waste water treatment reactor 2 is 150 mm.
The lower filter material pipe 3 is a round pipe with the diameter of 10 mm. The position of the discharge end of the lower filter material pipe 3 is higher than that of the feed end thereof. The discharge end of lower filter material pipe 3 is located the lower part of waste water treatment reactor 2, and is 50mm with the vertical distance of waste water treatment reactor 2 bottom, the feed end of lower filter material pipe 3 is located the lower part of waste gas treatment reactor 1's third reaction section III is 50mm with the vertical distance of waste gas treatment reactor 1 bottom, and waste water treatment reactor 2's bottom is higher than the bottom of waste gas treatment reactor 1, and waste water treatment reactor 2's top is less than the top of waste gas treatment reactor 1.
The filling height of the BAF filter material in the wastewater treatment reactor 2 is 845 mm.
Wastewater to be treated enters the wastewater treatment reactor 2 from the wastewater inlet 5, air is introduced into the wastewater treatment reactor 2 from the air inlet 6 through the aeration device 7, the wastewater and air and a biological membrane on a fixed BAF filter material 15 in the wastewater treatment reactor 2 are subjected to aerobic reaction, COD, ammonia nitrogen and other pollutants in the water are removed, and then the wastewater is discharged from the second water outlet 8. Part of the BAF filter material 15 at the bottom of the wastewater treatment reactor 2 enters the bottom of the exhaust gas reactor 1 through the lower filter material pipe 3. The second water outlet 8 of the wastewater treatment reactor 2 is communicated with the water inlet 11 of the waste gas treatment reactor 1; the second air outlet 9 of the wastewater treatment reactor 2 is communicated with the waste gas inlet of the waste gas treatment reactor 1; the first water outlet 13 of the waste gas treatment reactor 1 is communicated with the waste water inlet 5 of the waste water treatment reactor 2.
Waste gas to be treated and waste gas discharged from a second gas outlet 9 at the top of the waste water treatment reactor 2 are distributed through a waste gas inlet 10 through a first aeration device 14 and then enter the waste gas treatment reactor 1, and effluent discharged from the waste water treatment reactor 2 enters the waste gas treatment reactor 1 from a water inlet 11. In the third reaction section III at the lower part of the waste gas treatment reactor 1, the BAF filter material flows upwards under the action of waste gas and waste water to form a suspended bed state, in the upper part of the reactor, from the second reaction section II to the first reaction section I, along with the increase of the diameter of the reactor, the water flow and the gas velocity are slowed down, the BAF filter material is in a fixed bed state, and part of the BAF filter material returns to the upper part of the waste water reactor 2 from the upper filter material pipe 4. After harmful substances in the waste gas are decomposed by the biological membrane on the BAF filter material, the waste gas is led out from a first gas outlet 12 of the waste gas treatment reactor 1. The wastewater discharged from the waste gas treatment reactor 1 is discharged from the first water outlet 13 to be mixed with the wastewater to be treated, and then enters the wastewater treatment reactor 2 through the wastewater inlet 5.
The COD removal rate of the treated wastewater reaches 65 percent; the removal rate of ammonia in the treated waste gas reaches 98%, and the removal rate of hydrogen sulfide reaches 95%.
Example 2
Wastewater and waste gases were treated in the same manner as in example 1, except that the volume space velocity of the waste gases was 500h-1The removal rate of ammonia in the treated waste gas reaches 92%, and the removal rate of hydrogen sulfide reaches 90%.
Example 3
Wastewater and exhaust gas were treated in the same manner as in example 1, except that the retention time of wastewater was 15 hours, and the COD removal rate of the treated wastewater reached 60%.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims (17)

1. An exhaust gas and wastewater treatment plant, characterized in that the treatment plant comprises an exhaust gas treatment reactor (1) and a wastewater treatment reactor (2);
the waste gas treatment reactor (1) comprises from top to bottom: the flow area of the first reaction section (I) is larger than that of the third reaction section (III), the second reaction section (II) is a transition reaction section between the first reaction section (I) and the third reaction section (III), and the flow area of the second reaction section (II) is gradually reduced from the first reaction section (I) to the third reaction section (III); the waste gas treatment reactor (1) is also provided with a waste gas inlet (10) and a water inlet (11) which are respectively communicated with the third reaction section (III);
the wastewater treatment reactor (2) is a BAF reactor;
the treatment device also comprises a lower filter material pipe (3) used for leading the BAF filter material from the waste water treatment reactor (2) into the waste gas treatment reactor (1) for waste gas treatment, and an upper filter material pipe (4) used for circulating the BAF filter material from the waste gas treatment reactor (1) back to the waste water treatment reactor (2) after the waste gas treatment.
2. The exhaust gas and wastewater treatment apparatus according to claim 1,
the first reaction section (I) is cylindrical, the diameter-height ratio of the first reaction section (I) is 0.1-5:1, and the height of the first reaction section (I) is 3-30% of the vertical distance from the top of the waste gas treatment reactor (1) to the bottom of the reactor;
the second reaction section (II) is in an inverted frustum shape, the cross sectional area of the upper end of the second reaction section (II) is equal to that of the first reaction section (I), the cross sectional area of the lower end of the second reaction section (II) is equal to that of the third reaction section (III), and the height of the second reaction section (II) is 3-30% of the vertical distance from the top of the waste gas treatment reactor (1) to the bottom of the reactor;
the third reaction section (III) is cylindrical, the diameter-height ratio of the third reaction section (III) is 0.02-0.5:1, and the height of the third reaction section (III) is 40-94% of the vertical distance from the top of the waste gas treatment reactor (1) to the bottom of the reactor.
3. The waste gas and water treatment plant as claimed in claim 2, wherein the ratio of the diameter of the third reaction stage (iii) to the first reaction stage (i) is 1: 1.5-100.
4. An apparatus for the treatment of waste gases and water according to claim 3, wherein the ratio of the diameter of the third reaction stage (III) to the first reaction stage (I) is 1: 3-10.
5. The exhaust gas and wastewater treatment apparatus according to claim 1,
the position of the discharge end of the lower filter material pipe (3) is higher than that of the feed end thereof;
the position of the discharge end of the upper filter material pipe (4) is higher than that of the feed end thereof.
6. The waste gas and water treatment plant according to claim 5, characterized in that the discharge end of the lower filter tube (3) is located in the lower part of the waste water treatment reactor (2), and the feed end of the lower filter tube (3) is located in the lower part of the third reaction section (III) of the waste gas treatment reactor (1);
the discharge end of the upper filter tube (4) is positioned at the second reaction section (II) and/or the third reaction section (III) of the waste gas treatment reactor (1), and the feed end of the upper filter tube (4) is positioned at the upper part of the waste water treatment reactor (2).
7. The waste gas and water treatment apparatus according to claim 6, wherein the vertical distance between the discharge end of the lower filter tube (3) and the bottom of the waste water treatment reactor (2) is 20-200mm, and the vertical distance between the feed end of the lower filter tube (3) and the bottom of the waste gas treatment reactor (1) is 20-200 mm;
the discharge end of the upper filter tube (4) is positioned at the third reaction section (III) of the waste gas treatment reactor (1), the height of a filter material layer positioned above the discharge end of the upper filter tube (4) is at least 5mm, and the vertical distance between the feed end of the upper filter tube (4) and the top of the waste water treatment reactor (2) is 10-500 mm.
8. The waste gas and water treatment plant according to claim 7, characterized in that the discharge end of the upper filter tube (4) is located in the third reaction section (III) of the waste gas treatment reactor (1) and the height of the filter bed above the discharge end of the upper filter tube (4) is 5-100 mm.
9. The exhaust gas and wastewater treatment apparatus according to claim 6 or 8, characterized in that the bottom of the wastewater treatment reactor (2) is higher than the bottom of the exhaust gas treatment reactor (1), and the top of the wastewater treatment reactor (2) is lower than the top of the exhaust gas treatment reactor 1.
10. The waste gas and wastewater treatment plant according to claim 1 or 5, characterized in that the lower filter tube (3) and the upper filter tube (4) are both round tubes, the wastewater treatment reactor (2) is cylindrical, and the diameter ratio of the lower filter tube (3) to the wastewater treatment reactor (2) is 0.01-0.5: 1; the diameter ratio of the diameter of the upper filter material pipe (4) to the diameter of the wastewater treatment reactor (2) is 0.01-0.5: 1.
11. The waste gas and water treatment plant according to claim 1, characterized in that the waste gas treatment reactor (1) is further provided with a first gas outlet (12) and a first water outlet (13) located in the first reaction section (i);
the waste gas treatment reactor (1) is also provided with a first aeration device (14), the first aeration device (14) is arranged at the bottom of the reactor, and the waste gas inlet (10) is communicated with the waste gas treatment reactor (1) through the first aeration device (14).
12. The waste gas and water treatment plant according to claim 11, characterized in that the first gas outlet (12) is arranged at the upper part and/or top of the reactor and the first water outlet (13) is arranged at the upper part and/or top of the first reaction section (i) of the reactor.
13. The exhaust gas and wastewater treatment apparatus according to claim 1,
the wastewater treatment reactor (2) is also provided with a wastewater inlet (5), a second aeration device (7) and an air inlet (6), the wastewater inlet (5) is arranged at the lower part of the reactor, the second aeration device (7) and the air inlet (6) are arranged at the bottom of the reactor, and the air inlet (6) is communicated with the wastewater treatment reactor (2) through the second aeration device (7);
the wastewater treatment reactor (2) is also provided with a second water outlet (8) and a second air outlet (9), the second water outlet (8) is arranged at the upper part and/or the top of the reactor, and the second air outlet (9) is arranged at the upper part and/or the top of the reactor.
14. The exhaust gas and wastewater treatment apparatus according to claim 11 or 12, characterized in that the first water outlet (13) of the exhaust gas treatment reactor (1) communicates with the wastewater inlet (5) of the wastewater treatment reactor (2).
15. The waste gas and water treatment plant as claimed in claim 13, characterized in that the second water outlet (8) of the waste water treatment reactor (2) communicates with the water inlet (11) of the waste gas treatment reactor (1).
16. The exhaust gas and wastewater treatment plant according to claim 13, characterized in that the second outlet (9) of the wastewater treatment reactor (2) is in communication with the exhaust gas inlet (10) of the exhaust gas treatment reactor (1).
17. An exhaust and wastewater treatment plant according to claim 1, characterized in that both the exhaust gas treatment reactor (1) and the wastewater treatment reactor (2) are filled with BAF filter material (15).
CN201710898674.1A 2017-09-28 2017-09-28 Waste gas and waste water treatment device Active CN109569265B (en)

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CN102849844A (en) * 2012-10-10 2013-01-02 南京大学 Coupling bioreactor and method for simultaneously purifying malodorous gas and waste water by using same
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