CN106731774A - A kind of waste gas, sewage coprocessing system and method - Google Patents

A kind of waste gas, sewage coprocessing system and method Download PDF

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Publication number
CN106731774A
CN106731774A CN201710052101.7A CN201710052101A CN106731774A CN 106731774 A CN106731774 A CN 106731774A CN 201710052101 A CN201710052101 A CN 201710052101A CN 106731774 A CN106731774 A CN 106731774A
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China
Prior art keywords
mixture
activated sludge
purified water
waste gas
sewage
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李伟波
韩洪波
马晋
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Shenzhen Weichuang Rio Tinto Industrial Development Co ltd
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Shenzhen Huayun Environmental Protection Technology Development Co Ltd
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Priority to CN201710052101.7A priority Critical patent/CN106731774A/en
Publication of CN106731774A publication Critical patent/CN106731774A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84Biological processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D47/00Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/12Washers with plural different washing sections
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/95Specific microorganisms
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/004Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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

Abstract

A kind of waste gas, sewage coprocessing system and method the invention discloses environmental protection technical field:Cause that the mixture of sewage and activated sludge, the first waste gas are fully contacted by the way of bubble aeration, obtain the mixture of the first purified water and activated sludge;Mixture with first purified water and activated sludge is spray liquid and the second exhaust gas contact, the second purified water and activated sludge mixture, the part in second purified water and the mixture of activated sludge reclaims the component in the mixture as the sewage and activated sludge;The second purified water described in another part is set to be fully contacted with the 3rd waste gas with the mixture of activated sludge by the way of bubble aeration, the 3rd purified water and activated sludge mixture, the component in the mixture of Water Sproading in the 3rd purified water and the mixture of activated sludge as the second purified water and activated sludge;The system includes 3 coprocessing systems.The investment of sewage exhaust-gas treatment facilities and operating cost are reduced, carbon emission is reduced.

Description

Waste gas and sewage cooperative treatment system and method
Technical Field
The invention relates to the technical field of environmental protection, in particular to a system and a method for cooperatively treating waste gas and sewage.
Background
The exhaust gas often contains pollutants such as odor (such as mercaptan, ammonia, hydrogen sulfide, volatile organic acids, benzenes, etc.), sulfur oxides, nitrogen oxides, hydrophobic fine particulate matters, etc., as well as oxygen and carbon dioxide.
The sewage often contains pollutants such as carbohydrates, ammonia nitrogen, nitrate nitrogen, hydrogen sulfide, suspended matters, various alkaline substances, phosphorus compounds and the like.
Common methods for purifying exhaust gases and sewage include chemical, physical, biological, etc. methods, which remove or convert pollutants into harmless substances, water and carbon dioxide.
The waste water and the sewage contain various pollutants, and the waste gas and the sewage are respectively treated in the prior art, so that the treatment equipment investment is large and the operation cost is high due to headache and foot pain.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a system and a method for co-processing waste gas and sewage.
The above purpose of the invention is realized by the following technical scheme:
in a first aspect, the invention provides a method for co-processing waste gas and sewage, comprising the following steps:
fully contacting the mixture of the sewage and the activated sludge and the first waste gas by adopting a bubble aeration mode to obtain a mixture of first purified water and the activated sludge and first purified gas, and directly discharging the first purified gas;
taking the mixture of the first purified water and the activated sludge as a spraying liquid, and fully contacting with reversely input second waste gas to obtain a second purified gas, a mixture of the second purified water and the activated sludge, wherein the second purified gas is directly discharged, and a part of the mixture of the second purified water and the activated sludge is recovered and then is continuously used as a component in the mixture of the sewage and the activated sludge;
and fully contacting the other part of the mixture of the second purified water and the activated sludge with third waste gas in a bubble aeration mode to obtain third purified gas, the mixture of the third purified water and the activated sludge, directly discharging the third purified gas, and recovering water in the mixture of the third purified water and the activated sludge to be continuously used as a component in the mixture of the second purified water and the activated sludge.
As an implementation form of the embodiment of the present invention, the first waste gas, the second waste gas, and the third waste gas are waste gases including odor, particulate pollutants, oxygen, and carbon dioxide; wherein the odor comprises mercaptan, ammonia, hydrogen sulfide, volatile organic acids and benzene.
As an implementation form of the embodiment of the invention, the dominant microbial strains in the activated sludge comprise nitrite bacteria, nitrate bacteria and denitrifying bacteria.
As a realization form of the embodiment of the present invention, the sufficient contact between the mixture of the first purified water and the activated sludge as the spray liquid and the reversely input second waste gas is specifically performed in the packed spray washing tower.
As an implementation form of the embodiment of the present invention, the recycling specifically includes: and carrying out filter pressing on the mixture of the third purified water and the activated sludge to obtain water and sludge cakes, and recovering a turbid liquid part in the water.
In a second aspect, the invention provides a waste gas and sewage co-processing system, which comprises a first co-processing system, a second co-processing system and a third co-processing system; wherein,
the first cooperative treatment system is used for mixing the mixture of the sewage and the activated sludge and the first waste gas in a bubble aeration mode to obtain a mixture of first purified water and the activated sludge and first purified gas which are subjected to cooperative treatment;
the second co-processing system is connected with the first co-processing system and is used for receiving the mixture of the first purified water and the activated sludge, taking the mixture as a spraying liquid, and fully contacting with a second waste gas which is reversely input to obtain a mixture of the second purified water and the activated sludge and a second purified gas which are subjected to co-processing; a part of the mixture of the second purified water and the activated sludge is input into the first co-treatment system;
and the third co-processing system is connected with the second co-processing system and is used for receiving another part of the mixture of the second purified water and the activated sludge and fully contacting the other part with third waste gas in a bubble aeration mode to obtain a co-processed third purified gas, a mixture of the third purified water and the activated sludge, and recovering and processing a liquid part in the mixture of the third purified water and the activated sludge.
As an implementation form of the embodiment of the invention, the first co-processing system comprises a first aeration tank for containing a mixture of sewage and activated sludge, and a first aeration system for inputting a first waste gas into the mixture of sewage and activated sludge by adopting a bubble aeration mode.
As an implementation form of the embodiment of the present invention, the second co-processing system includes a first slurry pump connected to the first co-processing system and configured to introduce a mixture of the first purified water and the activated sludge obtained by the first co-processing system into the second co-processing system, and a filler spray scrubber configured to take the mixture of the first purified water and the activated sludge as a spray liquid to sufficiently contact a second waste gas introduced into the second co-processing system; the bottom of the side surface of the filler spraying washing tower is provided with a second waste gas inlet, the top surface of the filler spraying washing tower is provided with a second purified gas outlet, and the bottom surface of the filler spraying washing tower is provided with a mixture outlet of second purified water and activated sludge; and the outlet of the mixture of the second purified water and the activated sludge is connected with the first synergistic treatment system and the third synergistic treatment system, and is used for recycling one part of the mixture of the second purified water and the activated sludge to the first synergistic treatment system and inputting the other part of the mixture of the second purified water and the activated sludge to the third synergistic treatment system.
As an implementation form of the embodiment of the present invention, the third co-processing system includes a second aeration tank for receiving another part of the mixture of the second purified water and the activated sludge output by the second co-processing system, a second aeration system for inputting a third waste gas into the mixture of the second purified water and the activated sludge by using a bubble aeration method, and a recovery processing system for recovering and reprocessing a liquid part in the mixture of the third purified water and the activated sludge.
As an implementation form of the embodiment of the present invention, the recycling processing system includes:
the second slurry pump is arranged at the bottom of the second aeration tank and is used for outputting the mixture of the third purified water and the activated sludge in the second aeration tank;
a filter-pressing dehydrator for performing filter-pressing on a mixture of third purified water and activated sludge output by the second slurry pump to obtain filter-pressing liquid and sludge cakes; the filter-pressing dehydrator is provided with a mud cake outlet for discharging mud cakes and a filter-pressing liquid outlet for discharging filter-pressing liquid, and the filter-pressing liquid outlet is branched into a turbid liquid pipeline for recycling turbid parts in the filter-pressing liquid into the second aeration tank and a clear liquid pipeline for discharging clear parts in the filter-pressing liquid out of the system.
Compared with the prior art, the invention has the following beneficial effects:
the invention carries out purification treatment of waste gas and sewage in a synergic manner, belongs to a technology for treating waste by waste, reduces the construction investment and the operation cost of sewage and waste gas treatment facilities, and greatly reduces carbon emission.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a block diagram of a system provided in an embodiment of the present application;
wherein, 10-a first cooperative treatment system, 11-a first aeration, 111-a first mixture inlet, 112-a bottom surface of a first aeration tank, 113-a first bottom tank, 12-the first aeration system, 121-a first waste gas horizontal pipeline, 122-a first aeration pipe, 13-a first suspended porous filler, 20-a second cooperative treatment system, 21-a first slurry pump, 22-a filler spray washing tower, 221-a second waste gas inlet, 222-a second purified gas outlet, 223-a mixture outlet of second purified water and activated sludge, 224-a first recovery pipeline, 225-a second recovery pipeline, 226-a first valve, 227-a second valve, 23-an induced draft fan, 30-a third cooperative treatment system, 31-a second aeration tank, 311-the bottom surface of a second aeration tank, 312-a second bottom tank, 32-a second aeration system, 321-a second waste gas horizontal pipeline, 322-a second aeration pipe, 33-a recovery treatment system, 331-a second slurry pump, 332-a filter-pressing dehydrator, 3321-a mud cake outlet, 3322-a pressure filtrate outlet, 3323-a turbid liquid pipeline, 3324-a clear liquid pipeline, 3325-a switching valve and 34-a second suspended porous filler.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
The embodiment of the invention provides a waste gas and sewage synergistic treatment method, which comprises the following steps:
fully contacting the mixture of the sewage and the activated sludge and the first waste gas by adopting a bubble aeration mode to obtain a mixture of first purified water and the activated sludge and first purified gas, and directly discharging the first purified gas;
taking the mixture of the first purified water and the activated sludge as a spraying liquid, and fully contacting with reversely input second waste gas to obtain a second purified gas, a mixture of the second purified water and the activated sludge, wherein the second purified gas is directly discharged, and a part of the mixture of the second purified water and the activated sludge is recovered and then is continuously used as a component in the mixture of the sewage and the activated sludge;
and fully contacting the other part of the mixture of the second purified water and the activated sludge with third waste gas in a bubble aeration mode to obtain third purified gas, the mixture of the third purified water and the activated sludge, directly discharging the third purified gas, and recovering water in the mixture of the third purified water and the activated sludge to be continuously used as a component in the mixture of the second purified water and the activated sludge.
In the method, the mixture of the sewage and the activated sludge and the first waste gas are fully contacted by adopting a bubble aeration mode to obtain a mixture of first purified water and the activated sludge and first purified gas, and the first purified gas is directly discharged;
the method comprises the following steps: the first waste gas is converted into fine bubbles under the action of the aeration device, the fine bubbles and the mixture of the sewage and the activated sludge are in full contact, oxygen and carbon dioxide contained in the first waste gas are absorbed by the activated sludge, so that microorganisms in the activated sludge are proliferated, acidic components and alkaline components in the sewage and the first waste gas are neutralized, and meanwhile, the microorganisms in the activated sludge remove organic pollutants by adsorbing, absorbing and converting the organic pollutants and the like in the waste water and the first waste gas.
In this step of some embodiments, the predominant microbial species in the activated sludge includes nitrite bacteria, nitrate bacteria, and denitrification bacteria. Under aerobic conditions, ammonia nitrogen is oxidized into nitrite and nitrate by nitrifying bacteria, and the method comprises two basic reaction steps: nitrite bacteria participate in the reaction of converting ammonia nitrogen into nitrite; the reaction of converting nitrite into nitrate with the participation of the nitrate bacteria; nitrite bacteria and nitrate bacteria are chemoautotrophic bacteria, and they utilize CO2、CO3 2-、HCO3-Etc. as a carbon source via NH3、NH4+Or NO2-By oxidation-reduction ofThe reaction obtains energy. In addition, denitrifying bacteria undergo a denitrification reaction: under the anoxic condition, nitrite and nitrate generated by the nitration reaction are reduced into nitrogen and escaped from the sewage, thereby achieving the aim of removing nitrogen; in the denitrification process, denitrifying bacteria need organic carbon sources (such as carbohydrate, alcohol and organic acid) as electron donors and utilize NO2-、NO3-The oxygen in (b) performs hypoxic respiration.
In the method, the mixture of the first purified water and the activated sludge is used as a spray liquid and is fully contacted with reversely input second waste gas to obtain a second purified gas, a mixture of the second purified water and the activated sludge, the second purified gas is directly discharged, and a part of the mixture of the second purified water and the activated sludge is recovered and then is continuously used as a component in the mixture of the sewage and the activated sludge;
the method comprises the following steps: the mixture of the first purified water and the activated sludge is input into the spraying device and is sprayed from top to bottom as spraying liquid, the second waste gas is input from bottom to top from the bottom of the spraying device, the mixture of the first purified water and the activated sludge which are input reversely fully contacts with the second waste gas, pollutant components in the first purified water and the activated sludge have acid-base neutralization effect, meanwhile, microorganisms in the mixture of the first purified water and the activated sludge remove organic pollutants by adsorbing, absorbing and converting the organic pollutants and the like in the second waste gas, and oxygen and carbon dioxide are absorbed for proliferation.
In some embodiments, this step occurs in a packed spray scrubber tower having 2-3 layers of packing with spray headers above each layer of packing.
In some embodiments, the type of packing in the packing spray scrubber includes, but is not limited to, pall rings.
In some embodiments, the material of the packing in the packing spray washing tower is stainless steel, plastic, ceramic, and the like.
In the method, another part of the mixture of the second purified water and the activated sludge is fully contacted with the third waste gas in a bubble aeration mode to obtain a third purified gas, a mixture of the third purified water and the activated sludge, the third purified gas is directly discharged, and water in the mixture of the third purified water and the activated sludge is recovered and then is continuously used as a component in the mixture of the second purified water and the activated sludge.
In some embodiments, the recovering is specifically a filter pressing of the mixture of the third purified water and the activated sludge to obtain a water, sludge cake.
In some embodiments, the water content of the mud cake is less than 40%.
In some embodiments, the filter press employed for said press filtration is a batch-operated filter press with filter cloth; the filter press is limited in types, mainly aiming at ensuring that the water content of the mud cake is low, the filter cloth and the formed mud film have good filtering effect on the filtrate, the pollutant concentration in the filter cloth is reduced as much as possible, and the subsequent sewage treatment cost of the filtrate is reduced.
In some embodiments, the recovering is specifically recovering a turbid liquid part in the filter-press obtained water.
In some embodiments, the turbid liquid is evaluated by: the concentration of suspended matters in the water is more than or equal to 20 mg/L.
In the above method, the exhaust gas comprises odor, particulate pollutants, oxygen, carbon dioxide; such as mercaptans, ammonia, hydrogen sulfide, volatile organic acids, aromatic compounds, and the like.
To facilitate an understanding of the above method, the inventors further detailed the following:
firstly, pumping pollutants containing odor (such as mercaptan, ammonia, hydrogen sulfide, volatile organic acid, aromatic compounds and the like), sulfur oxides, nitrogen oxides, hydrophobic fine particles and the like, and oxygen and carbon dioxide into a filler spray washing tower by using a draught fan, wherein a spray liquid is sewage which contains pollutants such as carbohydrate, ammonia nitrogen, nitrate nitrogen, hydrogen sulfide, phosphorus compounds, suspended matters, activated sludge and the like and is strong in alkalinity; in the filler spraying washing tower, the waste gas is fully contacted with the sewage, the activated sludge absorbs oxygen and carbon dioxide to adsorb, absorb and convert various pollutants for removal, so that the activated sludge is proliferated, and the strong alkalinity of the sewage is also neutralized by acidic substances in the waste gas;
step two, the sewage after reaction flows out of a filler spray washing tower and enters an aerobic aeration tank, an aeration device is arranged at the bottom of the aeration tank, the used gas is waste gas containing pollutants such as odor (such as mercaptan, ammonia, hydrogen sulfide, volatile organic acid, benzene and the like), oxygen and carbon dioxide, the waste gas is converted into fine bubbles by the aeration device and enters the sewage to be fully contacted with the sewage, the activated sludge absorbs the oxygen and the carbon dioxide to adsorb, absorb and convert various pollutants to remove, so that the activated sludge is proliferated, and the strong alkalinity of the sewage is also neutralized by acidic substances in the waste gas; the aerobic aeration tank is also provided with a suspended porous filler, microorganisms can be adhered to the suspended porous filler to form a biological membrane, so that various pollutants in waste gas and sewage can be better adsorbed, absorbed and converted, and the treatment efficiency is greatly improved;
step three, arranging a sewage circulating pump at the bottom of the aerobic aeration tank, and conveying the sewage in the tank into a filler spraying washing tower for reaction; the aerobic aeration tank is provided with a filter press feeding pump at the bottom, sewage is sent to a plate-and-frame filter press dehydrator (the filtering effect is greatly increased after a mud film is formed on filter cloth of the aerobic aeration tank, which is equivalent to a film of a film bioreactor (MBR). The filter press dehydrating device has the advantages of being capable of continuously updating along with the removal of the mud cake, not easy to block, and low in water content of the formed mud cake, and capable of greatly reducing subsequent treatment cost), filter-press dehydrating is carried out, residual activated sludge and suspended matters are formed into the mud cake (the film of the film bioreactor can only concentrate sludge, but can not form the mud cake, and still needs sludge dehydration equipment) to be removed, backflow treatment is carried out before the appearance of filter-press liquid is in a clear and transparent state, and the filter-press liquid is switched to discharge after being in the.
Referring to fig. 1, an embodiment of the present invention further provides a co-processing system 100 for waste gas and sewage, which includes a first co-processing system 10, a second co-processing system 20, and a third co-processing system 30; wherein,
the first co-processing system 10 is used for mixing the mixture of the sewage and the activated sludge and the first waste gas in a bubble aeration mode to obtain a mixture of first purified water and activated sludge and first purified gas which are co-processed;
the second co-processing system 20 is connected with the first co-processing system 10 and is used for receiving the mixture of the first purified water and the activated sludge, taking the mixture as a spraying liquid, and fully contacting the mixture with a second waste gas which is reversely input to obtain a mixture of the second purified water and the activated sludge and a second purified gas which are co-processed; a part of the mixture of the second purified water and the activated sludge is inputted into the first co-processing system 10;
and the third co-processing system 30 is connected with the second co-processing system 20 and is used for receiving another part of the mixture of the second purified water and the activated sludge and fully contacting the other part with a third waste gas in a bubble aeration mode to obtain a co-processed third purified gas, a mixture of the third purified water and the activated sludge, and recovering and processing a liquid part in the mixture of the third purified water and the activated sludge.
The first co-processing system 10 comprises a first aeration tank 11 for accommodating a mixture of sewage and activated sludge, and a first aeration system 12 for inputting a first waste gas into the mixture of sewage and activated sludge in a bubble aeration mode;
in some embodiments, the first aeration tank 11 is provided with a first mixture inlet 111 to which a mixture of sewage and activated sludge is input; the first aeration system 12 includes a plurality of first exhaust gas horizontal pipes 121 and a plurality of first aeration pipes 122 disposed on each of the first exhaust gas horizontal pipes 121.
In some embodiments, the first horizontal exhaust conduit 121 is perpendicular to the first aeration pipe 122.
In some embodiments, the aeration direction of the first aeration pipe 122 is opposite to the direction of the first mixture inlet 111.
In some embodiments, the bottom surface 112 of the first aeration tank 11 is inclined, one side is higher than the other side, and the lower side is recessed to form a first bottom groove 113.
In some embodiments, the first suspension porous filler 13 is further added to the first aeration tank 11, and a biological film is gradually formed on the first suspension porous filler 13, so that the biochemical reaction efficiency can be improved; the presence of biofilm on the first suspended porous packing 13 ensures a higher biological capacity in the system when higher activated sludge concentrations cannot be maintained.
The second co-processing system 20 comprises a first slurry pump 21 connected to the first co-processing system 10 for feeding the mixture of the first purified water and the activated sludge obtained by the first co-processing system 10 into the second co-processing system 20, and a filler spray scrubber 22 for fully contacting the second waste gas fed into the second co-processing system 20 by using the mixture of the first purified water and the activated sludge as a spray liquid; the bottom of the side surface of the filler spray washing tower 22 is provided with a second waste gas inlet 221, the top surface is provided with a second purified gas outlet 222, and the bottom surface is provided with a mixture outlet 223 of second purified water and activated sludge; the outlet 223 of the mixture of the second purified water and the activated sludge is connected to the first and the third cooperative processing systems 10 and 30, and is used for recycling a part of the mixture of the second purified water and the activated sludge to the first and the third cooperative processing systems 10 and 30.
In some embodiments, the first mud pump 21 is disposed at the bottom of the first aeration tank 11 of the first co-processing system 10.
In some embodiments, the first mud pump 21 is disposed in the first bottom tank 113.
In some embodiments, the second purge gas outlet 222 is connected to an induced draft fan 23 that facilitates the input of the second exhaust gas from the second exhaust gas inlet 221 into the packing spray scrubber 22 and the output of the second purge gas from the second purge gas outlet 222 out of the packing spray scrubber 22.
In some embodiments, the type of packing in the packing spray scrubber 22 includes, but is not limited to, pall rings.
In some embodiments, the packing material in the packed spray scrubber 22 is stainless steel, plastic, ceramic, or the like.
In some embodiments, the outlet 223 of the mixture of the second purified water and the activated sludge is terminated into two branch pipes, i.e., a first recycling pipe 224 and a second recycling pipe 225, the first recycling pipe 224 is connected to the first co-processing system 10, and the second recycling pipe 225 is connected to the third co-processing system 30.
In some embodiments, the first recovery conduit 224 is provided with a first valve 226, the second recovery conduit 225 is provided with a second valve 227; the first valve 226 is used to control the input of the mixture of the second purified water and the activated sludge into the first co-processing system 10, and the second valve 227 is used to control the input of the mixture of the second purified water and the activated sludge into the third co-processing system 30.
The third co-processing system 30 includes a second aeration tank 31 for receiving another part of the mixture of the second purified water and the activated sludge output from the second co-processing system 20, a second aeration system 32 for supplying a third exhaust gas to the mixture of the second purified water and the activated sludge by means of bubble aeration, and a recovery processing system 33 for recovering a liquid part of the mixture of the third purified water and the activated sludge.
In some embodiments, the second aeration tank 31 is connected to the second recovery pipe 225.
In some embodiments, the bottom 311 of the second aeration tank 31 is inclined, one side is higher than the other side, and the lower side is recessed to form a second bottom groove 312.
In some embodiments, the second aeration system 32 includes a plurality of second exhaust gas horizontal pipes 321 and a plurality of second aeration pipes 322 disposed on the second exhaust gas horizontal pipes 321.
In some embodiments, the second horizontal exhaust conduit 321 is perpendicular to the second aeration pipe 322.
In some embodiments, the aeration direction of the second aeration pipe 322 is opposite to the direction in which the second recovery pipe 225 inputs the mixture of the second purified water and the activated sludge.
In some embodiments, the second aeration system 32 is coupled to the first aeration system 12, see fig. 1.
In some embodiments, the recycling processing system 33 includes:
a second mud pump 331 provided at the bottom of the second aeration tank 31 for outputting a mixture of the third purified water and the activated sludge in the second aeration tank 31;
a filter press dehydrator 332 for performing filter pressing on a mixture of the third purified water and the activated sludge output from the second mud pump 331 to obtain a filter press liquid and a mud cake; the filter-press dehydrator 332 is provided with a mud cake outlet 3321 for discharging mud cakes and a pressure filtrate outlet 3322 for discharging pressure filtrate, and the pressure filtrate outlet 3322 is branched into a turbid liquid pipeline 3323 for recovering turbid parts in the pressure filtrate into the second aeration tank 31 and a clear liquid pipeline 3324 for discharging clear parts in the pressure filtrate out of the system.
In some embodiments, the turbid liquid conduit 3323 and the clarified liquid conduit 3324 are connected to the filtrate outlet 3322 by a switching valve 3325.
In some embodiments, the second mud pump 331 is disposed in the second bottom tank 312 of the second aeration tank 31.
In some embodiments, the filter press dehydrator 332 is a batch filter press with filter cloth (the filter cloth is of a standard conventionally used for filter pressing of sewage treatment activated sludge, and is mainly filtered by a formed sludge film, and the clear outlet water indicates that the thickness of the sludge film meets the requirement); the type of the filter press is limited mainly for ensuring that the water content of the produced mud cake is low, and the low water content of the mud cake means that the volume of the filter press is greatly reduced and the energy consumption during incineration is greatly reduced.
In some embodiments, a second suspension porous filler 34 is further added to the second aeration tank 31, and a biofilm is gradually formed on the second suspension porous filler 34, so that the biochemical reaction efficiency can be improved; the presence of biofilm on the second suspended porous packing 34 ensures a higher biological capacity in the system when higher activated sludge concentrations cannot be maintained.
In the above embodiments, the first waste gas, the second waste gas, and the third waste gas specifically refer to waste gases containing pollutants including odor, oxygen, and carbon dioxide, which enter through different inlets; such as mercaptans, ammonia, hydrogen sulfide, volatile organic acids, benzene, and the like.
In the above embodiment, the first suspended porous packing 13 and the second suspended porous packing 34 are the packing applied in the wastewater treatment which is common at present.
The invention belongs to a technology for treating waste by waste, can greatly reduce the construction investment and the operation cost of sewage and waste gas treatment facilities, and greatly reduce the carbon emission.
The principle of the cooperative processing of the invention is as follows: the growth of microorganisms in activated sludge requires various nutrients including carbohydrates, nitrogen, phosphorus, and sulfur, which are often pollutants in waste gases and sewage; some microorganisms need to absorb oxygen to release carbon dioxide during growth, some microorganisms need to absorb carbon dioxide (such as nitrifying bacteria) during growth without oxygen, and carbon dioxide in the waste gas belongs to acid gas and can neutralize the alkalinity of the sewage, so that the addition of a neutralizing agent is saved, the oxygen and the carbon dioxide in the waste gas can be fully utilized, and the energy consumption and the carbon emission are reduced. The biofilm can be gradually formed on the filler of the filler spraying washing tower, and the biochemical reaction efficiency can be improved. Activated sludge and biological membrane contain zoogloea, can secrete mucus (extracellular polymeric substance of microorganism, and its component is mainly polysaccharide), and can adsorb and remove hydrophobic fine particulate matter which is difficult to wash down from waste gas.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The cooperative treatment method for the waste gas and the sewage is characterized by comprising the following steps:
fully contacting the mixture of the sewage and the activated sludge and the first waste gas by adopting a bubble aeration mode to obtain a mixture of first purified water and the activated sludge and first purified gas, and directly discharging the first purified gas;
taking the mixture of the first purified water and the activated sludge as a spraying liquid, and fully contacting with reversely input second waste gas to obtain a second purified gas, a mixture of the second purified water and the activated sludge, wherein the second purified gas is directly discharged, and a part of the mixture of the second purified water and the activated sludge is recovered and then is continuously used as a component in the mixture of the sewage and the activated sludge;
and fully contacting the other part of the mixture of the second purified water and the activated sludge with third waste gas in a bubble aeration mode to obtain third purified gas, the mixture of the third purified water and the activated sludge, directly discharging the third purified gas, and recovering water in the mixture of the third purified water and the activated sludge to be continuously used as a component in the mixture of the second purified water and the activated sludge.
2. The cooperative waste gas and water treatment method according to claim 1, wherein the first waste gas, the second waste gas and the third waste gas are waste gases comprising odor, particulate pollutants, oxygen and carbon dioxide; wherein the odor comprises mercaptan, ammonia, hydrogen sulfide, volatile organic acids, and aromatic compounds.
3. The cooperative waste gas and sewage treatment method as claimed in claim 1, wherein dominant microbial species in the activated sludge include nitrite bacteria, nitrate bacteria, and denitrifying bacteria.
4. The cooperative waste gas and sewage treatment method according to claim 1, wherein the sufficient contact between the mixture of the first purified water and the activated sludge as the spray liquid and the second waste gas reversely input is performed in a packed spray washing tower.
5. The cooperative waste gas and sewage treatment method according to claim 1, wherein the recycling is specifically: and carrying out filter pressing on the mixture of the third purified water and the activated sludge to obtain water and sludge cakes, and recovering a turbid liquid part in the water.
6. An exhaust gas and sewage co-processing system (100) is characterized by comprising a first co-processing system (10), a second co-processing system (20) and a third co-processing system (30); wherein,
the first co-processing system (10) is used for mixing the mixture of the sewage and the activated sludge and the first waste gas in a bubble aeration mode to obtain a mixture of co-processed first purified water and the activated sludge and first purified gas;
the second co-processing system (20) is connected with the first co-processing system (10) and is used for receiving the mixture of the first purified water and the activated sludge as a spraying liquid, and fully contacting the mixture with a second waste gas which is reversely input to obtain a mixture of the second purified water and the activated sludge and a second purified gas which are co-processed; a portion of the mixture of second purified water and activated sludge is fed into the first co-treatment system (10);
and the third co-processing system (30) is connected with the second co-processing system (20) and is used for receiving another part of the mixture of the second purified water and the activated sludge and fully contacting the other part with third waste gas in a bubble aeration mode to obtain a co-processed third purified gas, a mixture of the third purified water and the activated sludge, and recovering and processing a liquid part in the mixture of the third purified water and the activated sludge.
7. The exhaust gas and sewage cooperative treatment system (100) according to claim 6, wherein the first cooperative treatment system (10) comprises a first aeration tank (11) for containing a mixture of sewage and activated sludge, and a first aeration system (12) for introducing a first exhaust gas into the mixture of sewage and activated sludge by means of bubble aeration.
8. The cooperative waste gas and sewage treatment system (100) as claimed in claim 6, wherein the second cooperative treatment system (20) comprises a first slurry pump (21) connected to the first cooperative treatment system (10) for feeding a mixture of the first purified water and the activated sludge obtained by the first cooperative treatment system (10) into the second cooperative treatment system (20), and a filler spray washing tower (22) for fully contacting the second waste gas fed into the second cooperative treatment system (20) with the mixture of the first purified water and the activated sludge as a spray liquid; the bottom of the side surface of the filler spray washing tower (22) is provided with a second waste gas inlet (221), the top surface of the filler spray washing tower is provided with a second purified gas outlet (222), and the bottom surface of the filler spray washing tower is provided with a mixture outlet (223) of second purified water and activated sludge; the outlet (223) of the mixture of the second purified water and the activated sludge is connected with the first cooperative treatment system (10) and the third cooperative treatment system (30) and is used for recycling one part of the mixture of the second purified water and the activated sludge to the first cooperative treatment system (10) and inputting the other part of the mixture of the second purified water and the activated sludge to the third cooperative treatment system (30).
9. The cooperative exhaust gas and sewage treatment system (100) as recited in claim 6, wherein said third cooperative treatment system (30) comprises a second aeration tank (31) for receiving another portion of the mixture of the second purified water and the activated sludge outputted from the second cooperative treatment system (20), a second aeration system (32) for introducing a third exhaust gas into the mixture of the second purified water and the activated sludge by means of bubble aeration, and a recovery treatment system (33) for recovering and treating a liquid portion of the mixture of the third purified water and the activated sludge.
10. The exhaust gas-sewage co-treatment system (100) according to claim 9, wherein the recovery treatment system (33) comprises:
a second mud pump (331) disposed at the bottom of the second aeration tank (31) for outputting a mixture of the third purified water and the activated sludge in the second aeration tank (31);
a filter-press dehydrator (332) for performing filter-press on the mixture of the third purified water and the activated sludge output by the second mud pump (331) to obtain a filter-press liquid and a mud cake; the filter-pressing dehydrator (332) is provided with a mud cake outlet (3321) for discharging mud cakes and a pressure filtrate outlet (3322) for discharging pressure filtrate, and the pressure filtrate outlet (3322) is branched into a turbid liquid pipeline (3323) for recovering turbid parts in the pressure filtrate into the second aeration tank (31) and a clear liquid pipeline (3324) for discharging clear parts in the pressure filtrate out of the system.
CN201710052101.7A 2017-01-20 2017-01-20 A kind of waste gas, sewage coprocessing system and method Pending CN106731774A (en)

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