CN113636646A - Combined treatment method and device for waste water and waste gas - Google Patents
Combined treatment method and device for waste water and waste gas Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- 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
- B01D53/38—Removing components of undefined structure
- B01D53/44—Organic components
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/00—Components to be removed
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses a combined treatment method and a device for waste water and waste gas, comprising the following steps: collecting waste gas and waste water and feeding the waste gas and waste water into a biological treatment tower; collecting the wastewater into an anoxic reaction zone in the biological treatment tower, mixing nitrifying liquid and the wastewater which flow back from the aerobic reaction zone at the top of the anoxic reaction zone to form a mixed liquid, and improving the denitrification efficiency under the synergistic action of anoxic hydrolytic acidification and denitrification; the mixed liquor and the waste gas are lifted to an aerobic reaction zone, aerobic bacteria carry out aerobic biological purification reaction on the mixed liquor to form nitrified liquor, one part of nitrified liquor flows back to an anoxic reaction zone and is mixed with the waste water for the second time, the other part of nitrified liquor flows out of a biological treatment tower and is detected for the content of pollutants, and if the content of the pollutants in the nitrified liquor does not reach the standard, the nitrified liquor is treated by a multi-stage biological treatment tower; the invention has the advantages of low equipment investment, small equipment floor area, low equipment operation cost, good treatment effect, simultaneous standard discharge of waste water and waste gas after treatment and the like.
Description
Technical Field
The invention relates to the technical field of biological treatment of wastewater and waste gas, in particular to a combined treatment method and a combined treatment device for wastewater and waste gas.
Background
At present, the biological method is widely used at home and abroad for treating industrial, urban and rural organic wastewater, and because the anoxic and aerobic procedures of the existing treatment process treatment system are all water immersion type biological treatment systems and aerobic procedures for biological bacteriostasis, air or oxygen needs to be conveyed to the bottom of a tank for oxygen supply by a booster fan. On the one hand because the air feeder invests in, the energy consumption is high, lead to can not carry the bottom of the pool oxygen suppliment and handle the pollutant with the waste gas of the oxygen that contains of big tolerance and volatile organic pollutant, on the other hand because waste gas solubility in aqueous is very low, pollutant in the waste gas and aerobic microorganism bacteriostasis contact efficiency are very low, lead to the pollutant treatment effeciency very low, gaseous input bottom of the pool needs high energy consumption, oxygen in the gas and the pollutant that treats to get rid of are low in the solubility of aquatic, need dissolve can only with aerobic microorganism contact after the water, contact efficiency is low, so current waste water treatment technical method can not effectively handle waste gas simultaneously.
At present, the technology for treating volatile organic waste gases (VOCs) by a biological method widely adopted at home and abroad is characterized in that a built-in suspended biological filler is used, aerobic microorganisms are applied for spraying and circulating in the tank, and waste gases containing oxygen and pollutants are used as oxygen sources. A technique for degrading pollutants in exhaust gas. The prior art has the following defects:
1) because the circulation tank in the device does not possess the condition of degradation pollutant function, including the volume is little, along with increasing, the time extension of the aerobic microbe bacteriostasis liquid inner loop number of times, dissolve and go into the pollutant concentration that the microbe bacteriostasis liquid was mated gradually and increase. The contamination, particularly the toxic contamination, when applied to a certain concentration, results in the inhibition of activity or death of the applied microbe, applied to the applied microbe;
2) the method comprises the steps of dissolving and entering a microbe bacteriostasis solution, gradually increasing the concentration of pollutants, gradually reducing the difference between the concentration of the pollutants in waste gas and the concentration of the pollutants in the microbe bacteriostasis solution according to a chemical mass transfer principle, gradually reducing the removal effect if the pollutants dissolved in the bacteriostasis solution cannot be timely removed, and only periodically replacing or continuously entering fresh water and continuously discharging and absorbing saturated polluted water in the original method to keep enough absorption efficiency;
3) the applied microbe bacteriostasis quantity after the microbe bacteriostasis is applied to the microbe bacteriostasis to absorb the pollutants as the nutrients to propagate and metabolize is gradually increased, so that the surplus microbe sludge is generated, the applied microbe bacteriostasis activity is not timely eliminated in view of the reasons of the system configuration, the operation management and the like of the treatment device, and the applied microbe bacteriostasis activity is reduced, so that the waste gas treatment effect is reduced. In severe cases, the system can not operate normally;
4) according to the existing technical device for treating Volatile Organic Compounds (VOCs) by using a biological method, a circulating microbe bacteriostasis solution usually only contains pollutants in waste gas, the nutrients are single, easily-degradable nutrients (such as organic matters, nitrogen, phosphorus and other trace components in domestic sewage) required by the bacteriostasis are not added during operation, and the pollutant removal efficiency is low;
5) in view of the above, the existing technical devices for treating Volatile Organic Compounds (VOCs) by biological methods cannot be provided with an inlet and an outlet for simultaneously treating wastewater and internal functions, so that it is impossible to effectively treat organic wastewater and volatile organic compounds (voc) simultaneously.
Disclosure of Invention
The invention aims to provide a combined treatment method and a combined treatment device for waste water and waste gas, which are used for solving the problems in the prior art.
In order to achieve the above object, the present invention provides a combined treatment method for wastewater and waste gas, comprising: collecting waste gas and waste water and feeding the waste gas and waste water into a biological treatment tower;
collecting the wastewater into an anoxic reaction zone in the biological treatment tower, mixing nitrifying liquid refluxed by the aerobic reaction zone at the top of the anoxic reaction zone with the wastewater to form a mixed solution, wherein oxygen is not supplied to the anoxic reaction zone, so that aerobic bacteria are converted into anoxic bacteria, and the denitrification efficiency is improved under the synergistic action of anoxic hydrolysis acidification and denitrification;
the mixed liquid and the waste gas are lifted to an aerobic reaction zone, the waste gas provides oxygen for aerobic bacteria in the aerobic reaction zone, meanwhile, a gas phase with high concentration of volatile organic compounds in the waste gas continuously transfers mass to a water phase with low concentration for dissolution, the aerobic bacteria carry out aerobic biological purification reaction on the mixed liquid to form nitrified liquid, one part of the nitrified liquid flows back to an anoxic reaction zone and is secondarily mixed with the waste water, the other part of the nitrified liquid flows out of a biological treatment tower and the pollutant content is detected, and if the pollutant content in the nitrified liquid does not reach the standard, the nitrified liquid is treated by a multi-stage biological treatment tower;
and (3) carrying out oil-water-sludge separation treatment on the nitrified liquid with the pollutant content reaching the standard, and refluxing a part of separated sludge to the anoxic reaction area.
Preferably, the concentration of dissolved oxygen in the mixed solution is 0.1 to 0.5 mg/l.
Preferably, the gas generated in the anoxic hydrolysis acidification process is mixed with the waste gas and flows upwards to the aerobic reaction zone.
Preferably, the dissolved amount of the volatile organic compounds in the exhaust gas is proportional to the concentration difference and solubility of the solute in the gas phase and the liquid phase.
Preferably, in the oil-cement separation treatment process, the nitrified liquid is separated into floating oil sludge, clear water and sludge.
A combined treatment device for wastewater and waste gas comprises a solid-liquid separator, wherein the liquid inlet end of the solid-liquid separator is communicated with at least one stage of biological treatment tower;
an aerobic reaction zone and an anoxic reaction zone are sequentially arranged in the biological treatment tower from top to bottom, an air distribution chamber is arranged between the aerobic reaction zone and the anoxic reaction zone, the air inlet end of the air distribution chamber is communicated with a waste gas pollution source, and the water inlet end of the anoxic reaction zone is communicated with a waste water pollution source.
Preferably, the anoxic reaction zone comprises an anoxic tank, a stirrer is arranged in the anoxic tank, a nitrification liquid receiving tank is arranged between the anoxic tank and the gas distribution chamber, the nitrification liquid receiving tank is an annular groove, an overflow plate is arranged at the top opening of the nitrification liquid receiving tank, and the nitrification liquid receiving tank is communicated with the water discharge end of the biological treatment tower;
the aerobic reaction zone comprises an aerobic reactor, the top of the aerobic reactor is provided with a plurality of spray water distribution pipes, the spray water distribution pipes are communicated with the anoxic tank through pipelines, and the exhaust end of the biological treatment tower is arranged at the top of the spray water distribution pipes.
Preferably, a mud bucket is arranged in the solid-liquid separator, a central guide cylinder is arranged at the top of the mud bucket, a conical water baffle is arranged between the mud bucket and the central guide cylinder, the central guide cylinder is communicated with the water outlet end of the biological treatment tower, an annular oil overflow groove and an annular overflow weir are sequentially arranged on the outer side of the central guide cylinder from top to bottom, the annular oil overflow groove and the annular overflow weir are both positioned at the top of the bottom opening of the central guide cylinder, an oil-water separation annular guide baffle is arranged between the annular oil overflow groove and the annular overflow weir, and the oil-water separation annular guide baffle is used for preventing oil sludge floating upwards from entering the annular overflow weir;
the annular oil overflow groove is communicated with the oil discharge end of the solid-liquid separator, the oil discharge end of the solid-liquid separator is communicated with the sludge drying treatment system, and the annular overflow weir is communicated with the water discharge end of the solid-liquid separator.
Preferably, the bottom opening of the mud bucket is communicated with the mud discharging end of the solid-liquid separator, and the mud discharging end of the solid-liquid separator is respectively communicated with the anoxic tank and the sludge drying treatment system.
Preferably, the biological treatment towers are connected in series.
The invention discloses the following technical effects: the invention aims at the defects of the prior art and provides a method and a device for simultaneously treating organic wastewater and volatile organic waste gases (VOCs), and the method and the device have the advantages of low equipment investment, small equipment floor area, low equipment operation cost, good treatment effect, simultaneous standard reaching of wastewater and waste gas after treatment and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view showing the construction of an integrated exhaust gas treatment apparatus according to embodiment 1;
FIG. 2 is a schematic flow chart of a combined treatment method of exhaust gas according to example 1;
FIG. 3 is a schematic view showing the flow of combined treatment of wastewater and waste gas from amino acid production in example 2;
FIG. 4 is a schematic view of the solid-liquid separator of the present invention;
wherein, 1 is a waste gas suction hood, 2 is a fan, 3 is a waste water collecting tank, 4 is a sewage pump, 5 is a waste gas final discharge cylinder, 6 is a biological treatment tower, 6.1 is a mixed liquid lifting pump, 6.2 is a spraying water distribution pipe, 6.3 is an anoxic tank, 6.4 is a stirrer, 6.5 is a nitrifying liquid receiving tank, 6.6 is a gas distribution chamber, 6.7 is an overflow plate, 6.8 is an aerobic reactor, 8 is a solid-liquid separator, 8.1 is a mud bucket, 8.2 is a central guide cylinder, 8.3 is a conical water baffle, 8.4 is an annular oil overflow groove, 8.5 is an annular overflow weir, 8.6 is an oil-water separation annular guide baffle, 11 is an excess sludge discharge valve, 12 is a pre-pump control valve, 13 is a sludge reflux pump, 14 is a reflux control valve, 15 is a gas distribution pipe and 16 is a regulating valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a combined treatment method of wastewater and waste gas, which comprises the following steps: waste gas and waste water are collected and enter a biological treatment tower 6;
the collected wastewater is input into an anoxic reaction zone in the biological treatment tower 6 and is mixed with nitrifying liquid flowing back from an aerobic reaction zone at the upper part of the anoxic reaction zone to form mixed liquid, oxygen is not supplied in the anoxic reaction zone, aerobic bacteria in the refluxing nitrifying liquid are converted into anoxic bacteria, the denitrification efficiency is improved under the synergistic action of anoxic hydrolysis acidification and denitrifying bacteria, and the treatment in the anoxic reaction zone is a first biological purification process;
the mixed liquid degraded by the first procedure is lifted to the uniform spraying water distribution pipe 6.2 positioned at the upper part of the anoxic reaction zone, the mixed liquid enters the aerobic biological reaction zone from top to bottom uniformly through the water distribution pipe, the collected organic waste gas (VOCs) is input at the lower part of the aerobic reaction zone and flows through the aerobic reaction zone from bottom to top, the oxygen in the waste gas can provide oxygen for aerobic bacteria in the aerobic reaction zone, meanwhile, a gas phase with high concentration of volatile organic compounds in the waste gas continuously transfers mass and dissolves to a water phase (mixed liquid) with low concentration, the aerobic bacteria perform aerobic biological purification reaction on the mixed liquid dissolved with the volatile organic compounds to form nitrified liquid, if the oxygen content in the volatile organic compounds is insufficient, the air distribution pipe 15 and the regulating valve 16 are arranged at the air inlet, and the oxygen content of the mixed gas is controlled by controlling the air regulating valve. Collecting part of nitrified liquid from a nitrified liquid receiving tank 6.5 at the bottom of the aerobic biological purification area, refluxing to the anoxic reaction area, mixing with wastewater for the second time, allowing the other part of nitrified liquid to flow out of the biological treatment tower 6, detecting the content of pollutants, and treating the nitrified liquid by using the multistage biological treatment tower 6 if the content of pollutants in the nitrified liquid does not reach the standard; the treatment in the aerobic reaction zone is a second working procedure of biological purification,
and (3) separating oil, water and sludge from the nitrified liquid with the pollutant content reaching the standard, and refluxing a part of separated sludge to the anoxic reaction zone.
In a further optimization scheme, the concentration of dissolved oxygen in the mixed solution is 0.1-0.5 mg/l.
In the further optimization scheme, gas generated in the anoxic hydrolysis acidification process is mixed with waste gas and flows up to the aerobic reaction zone.
The oxygen content of the organic waste gas or the mixed gas of the organic waste gas and the air entering the aerobic reaction zone is more than 3 percent.
According to the further optimization scheme, the dissolving amount of volatile organic compounds in the waste gas is in direct proportion to the concentration difference and the solubility of solute in gas and liquid phases.
Further optimizing the scheme, separating the nitrifying liquid into floating oil sludge, clear water and sludge in the oil-water-sludge separation treatment process.
A combined treatment device for waste water and waste gas comprises a plurality of units, such as a waste water and waste gas collecting unit, a one-stage or multi-stage biological treatment tower 6, a solid-liquid separator 8 and the like;
the liquid inlet end of the solid-liquid separator 8 is communicated with at least one stage of biological treatment tower 6, an aerobic reaction zone and an anoxic reaction zone are sequentially arranged in the biological treatment tower 6 from top to bottom, an air distribution chamber 6.6 is arranged between the aerobic reaction zone and the anoxic reaction zone, the gas inlet end of the air distribution chamber 6.6 is communicated with a waste gas pollution source, a waste gas suction hood 1, an air distribution pipe 15, an adjusting valve 16 and a fan 2 are arranged on a connecting pipeline of the waste gas pollution source and the air distribution chamber 6.6, and the water inlet end of the anoxic reaction zone is communicated with a waste water pollution source.
According to a further optimization scheme, the anoxic reaction zone comprises an anoxic pond 6.3, specifically an anoxic microorganism acidification hydrolysis pond, a wastewater pollution source is a wastewater collecting pond 3, a sewage pump 4 is arranged on a pipeline between the wastewater collecting pond 3 and the anoxic pond 6.3, a stirrer 6.4 is arranged in the anoxic pond 6.3, a nitrifying liquid receiving tank 6.5 is arranged between the anoxic pond 6.3 and the gas distribution chamber 6.6, the nitrifying liquid receiving tank 6.5 is an annular groove, an overflow plate 6.7 is arranged at the top of the nitrifying liquid receiving tank 6.5, the nitrifying liquid receiving tank 6.5 is a facility arranged at the bottom of the aerobic reaction zone and positioned at the upper part of the anoxic pond 6.3, the overflow plate 6.7 with the height of 10-50cm is arranged at the center of the nitrifying liquid receiving tank 6.5, a liquid discharge port is arranged at the bottom of the nitrifying liquid receiving tank and communicated with the water discharge end of the biological treatment tower 6, and a mixed liquid lifting pump 6.1 is arranged on a pipeline communicated with the water discharge end of the nitrifying liquid receiving tank 6.5 and the biological treatment tower 6;
the aerobic reaction zone comprises an aerobic reactor 6.8, a large amount of fillers with high specific surface are suspended in the aerobic reactor 6.8, aerobic microorganisms are attached to the surfaces of the indicated fillers or are in a small droplet state, oxygen in continuously input mixed waste gas is oxygen required by the respiration of the microorganisms, pollutants in waste water and the mixed waste gas are nutrients of the microorganisms for aerobic biological purification, a plurality of spray water distribution pipes 6.2 are arranged at the top of the aerobic reactor 6.8, the spray water distribution pipes 6.2 are spray mechanisms with equal water distribution in a set time period according to unit area, the spray water distribution pipes 6.2 are communicated with the anoxic tank 6.3 through pipelines, and the exhaust end of the biological treatment tower 6 is arranged at the top of the spray water distribution pipes 6.2.
The exhaust end of the biological treatment tower 6 is the exhaust end of the waste gas containing air and pollutants at the top of the tower after being treated by one-stage or multi-stage biological treatment tower, if one-stage biological treatment is adopted, the exhaust end is directly connected with the waste gas final discharge cylinder 5, if multi-stage biological treatment is adopted, the exhaust end is connected with the air inlet end of the next-stage biological treatment tower 6, and the exhaust end at the top of the last-stage biological treatment tower 6 is provided with the waste gas final discharge cylinder 5.
According to a further optimization scheme, a mud bucket 8.1 is arranged in the solid-liquid separator 8, a central guide cylinder 8.2 is arranged at the top of the mud bucket 8.1, a conical water baffle 8.3 is arranged between the mud bucket 8.1 and the central guide cylinder 8.2, the central guide cylinder 8.2 is communicated with the water outlet end of the biological treatment tower 6, an annular oil overflow groove 8.4 and an annular overflow weir 8.5 are sequentially arranged on the outer side of the central guide cylinder 8.2 from top to bottom, the annular oil overflow groove 8.4 and the annular overflow weir 8.5 are both positioned at the top of the bottom of the central guide cylinder 8.2, an oil-water separation annular guide baffle 8.6 is arranged between the annular oil overflow groove 8.4 and the annular overflow weir 8.5, and the oil-water separation annular guide baffle 8.6 is used for preventing floating oil sludge from entering the annular overflow weir 8.5;
annular oil overflow groove 8.5 and solid-liquid separator 8's oil extraction end intercommunication, solid-liquid separator 8's oil extraction end intercommunication has sludge drying processing system, annular overflow weir 8.5 and solid-liquid separator 8's drainage end intercommunication, the end opening of mud fill 8.1 and solid-liquid separator 8's row mud end intercommunication, solid-liquid separator 8's row mud end communicates oxygen deficiency pond 6.3 and sludge drying processing system respectively, divide stream through solid-liquid separator 8 to mud, mud divides and relates to the part and includes mud backwash pump 13, control valve 12 before the pump, return flow control valve 14, unnecessary sludge discharge valve 11.
In a further optimized scheme, the one-stage or multi-stage biological treatment towers 6 are combined in series. The multistage biological treatment tower 6 is a two-stage or more than two-stage biological treatment tower 6 which is connected in series with the first-stage biological treatment tower 6 and has the same functional principle as the first-stage biological treatment tower 6, and the concentration of pollutants in wastewater and waste gas is reduced after the wastewater and the waste gas are treated by the first-stage biological treatment tower 6, but the second-stage or more than two-stage biological treatment tower 6 is arranged when the wastewater and the waste gas fail to reach the standard. The basic principle is as follows: the first-stage biological treatment tower 6 is used for treating waste water and waste gas, the concentration of pollutants is gradually reduced along with the gradual increase of the operation time, the concentration of pollutants in circulating spray liquid in the tower is gradually increased, the concentration difference of the pollutants in gas phase and liquid phase is gradually reduced, the mass transfer speed of the pollutants in the gas phase to the liquid phase is gradually reduced, the efficiency is gradually reduced, and the discharged waste gas and waste water can not be ensured to reach the standard. The biological treatment tower 6 with two or more stages reduces the concentration of the pollutants in the circulating spray liquid in the tower systematically, can ensure that the concentration difference of the pollutants in gas phase and liquid phase keeps relatively stable, the mass transfer speed of the pollutants remained in the gas phase to the liquid phase is basically stable, and the efficiency is basically stable, thereby leading the pollutants in the waste gas and the waste water to be continuously and stably reduced in a stepped manner until the pollutants reach the standard.
Example 1
Referring to fig. 1-2, the process flow and technical principle of the device are described in detail by taking a two-stage series biological tower as an example:
1) an oxygen-deficient process: the wastewater is introduced into a first-stage anoxic tank 6.3, nitrified liquid overflowing from the top of a nitrified liquid spraying receiving tank 6.5 at the bottom of an aerobic reactor 6.8 is fully stored in the anoxic tank 6.3, the nitrified liquid and wastewater raw water are mixed, the nitrified liquid and the wastewater raw water are stirred by a stirrer 6.4 and do not supply oxygen, the concentration of dissolved oxygen is controlled to be 0.1-0.5mg/l, aerobic bacteria are transformed into anoxic bacteria, C, N, P components which are easy to grow are contained in the organic wastewater under the action of anoxic biological bacteria, the hydrolytic acidification of pollutants which are difficult to degrade (such as benzene series and high molecular compounds) in the water and are dissolved in the wastewater can be promoted, the pollutants are transformed into low molecular compounds which are easy to degrade, the total nitrogen in the wastewater is transformed into nitrogen through the action of anoxic denitrification, and meanwhile, hydrogen sulfide, carbon dioxide and other malodorous gases are generated in the anoxic hydrolytic acidification process. The raw waste water and the return nitrification liquid are lifted to the spray water distribution pipe 6.2 by the mixed liquid lifting pump 6.1 after being treated by the anoxic procedure, and the generated malodorous gases such as nitrogen, hydrogen sulfide, carbon dioxide and the like flow up to the aerobic reactor 6.8 from the central hole of the nitrification liquid receiving tank 6.5 at the upper part.
2) An aerobic process: the mixed solution is sprayed through a group of spraying water distribution pipes 6.2 consisting of a plurality of spraying pipes or spraying heads, the mixed solution is uniformly sprayed into an aerobic reactor 6.8 full of biological fillers from top to bottom, meanwhile, waste gas containing oxygen and Volatile Organic Compounds (VOCs) (the oxygen concentration in the waste gas is more than 3%) to be treated enters an air distribution chamber 6.6 through an air inlet positioned at the bottom of the aerobic reactor 6.8, gases containing the oxygen, the Volatile Organic Compounds (VOCs), oily pollutants and nitrogen, hydrogen sulfide, carbon dioxide and the like generated in an anoxic process are mixed and homogenized in the air distribution chamber 6.6, the mixed gases uniformly flow through the aerobic reactor 6.8 from bottom to top, and microorganisms attached to the fillers and microorganisms in spraying liquid drop-shaped sludge are converted into aerobic microorganisms under the condition of sufficient oxygen and organic oxygen; volatile Organic Compounds (VOCs) in the waste gas are continuously mass-transferred and dissolved to a low-concentration water phase according to a gas-water mass transfer principle and a gas phase with high concentration of the Volatile Organic Compounds (VOCs), and the dissolved amount is in direct proportion to the concentration difference and the solubility of a solute in a gas phase and a liquid phase; aerobic microorganisms are subjected to aerobic biological purification through the processes of absorption, adsorption, degradation and the like, and COD, VOCs and the like in the wastewater and waste gas generated in the aerobic biological reaction are converted into carbon dioxide, water and ammonia nitrogen to be converted into nitrate nitrogen. The sprayed nitrified liquid drops to a nitrified liquid receiving tank 6.5 at the bottom, part of the nitrified liquid overflows from the upper opening of the nitrified liquid receiving tank 6.5 through an annular overflow plate 6.7 and flows back to an anoxic tank 6.3 at the bottom, the other part of the nitrified liquid is discharged into the anoxic tank 6.3 of a secondary biological treatment tower 6 through a liquid discharge pipe positioned at the bottom of the nitrified liquid receiving tank 6.5, and the nitrified liquid enters a solid-liquid separator 8 without the secondary biological treatment tower 6. The tail gas after treatment is discharged from the tower top waste gas final discharge cylinder 5, the waste gas which does not reach the standard is connected to the air inlet of the next-stage biological treatment tower 6, and the waste gas which reaches the standard is connected to the waste gas final discharge cylinder 5 and is discharged into the environment.
3) Oil, water and mud separation: the oil of the solid-liquid separator 8 is animal and vegetable oil, mineral oil and the decayed and floated density of the aged dead bacteriostat seed in the biological treatment tower is lower than that of water (oil)<1.0g/cm3) The floating materials are called as a whole; "Water" has a density of about 1.0g/cm3Clean water in the middle layer of the separator; the mud is sludge-shaped sludge applied to anoxic and aerobic organisms with a large amount of biological activity, and the density>1.0g/cm3。
Nitrified liquid is a mud-water mixture and can contain a small amount of floating oil matters with density being lighter than that of water in raw water and waste gas, the nitrified liquid enters a central guide cylinder 8.2, flows downwards and is dispersed and flows upwards to the periphery by a conical water baffle 8.3 to form a mud-water separation zone, sludge is respectively sunk to a bottom mud bucket 8.1 and then is discharged by a sludge discharge port in the mud-water separation zone according to different densities of mud, water and oil, clear water enters an annular overflow weir 8.5 in the middle layer and then is discharged from a clear water discharge port, oil sludge floats upwards, and an oil-water separation annular guide baffle 8.6 is arranged at the bottom of the overflow weir, so that the floating oil sludge is far away from the overflow weir in the mud-water separation process, and the floating oil sludge is prevented from being discharged from the overflow weir.
4) Sludge diversion: sludge split stream is for according to the mud-water mixed liquid of the discharged nitration liquid of biological treatment tower 6, contain a large amount of microbes to steep kind, need to steep the kind to the backward flow of partial microbes, could ensure that the kind of microbe is smoked in biological treatment tower 6 and keeps reasonable concentration range, the total phosphorus of biological treatment tower 6 is got rid of and is mainly relied on the phosphorus accumulation of anaerobic state to steep and purify, the mud that solid-liquid separation ware 8 produced is deposited the phosphorus accumulation condition that the anaerobic state accords with. The sludge discharged by the solid-liquid separator 8 is returned to the anoxic tank 6.3 of the biological treatment tower 6 by adjusting the amount of returned sludge through a sludge return pump 13 and a control valve of the sludge diversion system, and the floating sludge discharged by the solid-liquid separator 8 is introduced into the sludge return pump 13 and then mixed with excess sludge and discharged into a sludge drying treatment system.
Example 2
Referring to fig. 3, the difference from the above example 1 is that this example belongs to the specific application of the above example 1, and takes the combined treatment of the wastewater and waste gas in the amino acid production as an example, and adopts the secondary biological treatment as a whole.
The characteristics of the waste water and the waste gas generated in the production of the amino acid are as follows:
1) the sources of the wastewater comprise amino acid workshop cleaning liquid, ground washing water and factory domestic sewage;
2) the waste gas sources comprise ammonia water preparation and storage in an amino acid production workshop, product concentration waste gas, workshop unorganized emission waste gas, waste gas of a sewage treatment system and the like.
The main technical parameters of the processing technical device are as follows:
TABLE 1 Main technical parameter Table
The treatment effect of the treatment technology device is as follows:
TABLE 2 treatment Effect table
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. A combined treatment method for waste water and waste gas is characterized by comprising the following steps:
waste gas and waste water are collected and enter a biological treatment tower (6);
collecting the wastewater into an anoxic reaction zone in the biological treatment tower (6), mixing nitrifying liquid refluxed by an aerobic reaction zone at the upper part of the anoxic reaction zone with the wastewater to form mixed liquid, and not supplying oxygen in the anoxic reaction zone to convert aerobic bacteria into anoxic bacteria, and improving the denitrification efficiency under the synergistic action of anoxic hydrolysis acidification and denitrification;
the mixed liquid and the waste gas are lifted to an aerobic reaction zone, the waste gas provides oxygen for aerobic bacteria in the aerobic reaction zone, meanwhile, a gas phase with high concentration of volatile organic compounds in the waste gas continuously transfers mass to a water phase with low concentration for dissolution, the aerobic bacteria carry out aerobic biological purification reaction on the mixed liquid to form nitrified liquid, one part of the nitrified liquid flows back to an anoxic reaction zone and is secondarily mixed with the waste water, the other part of the nitrified liquid flows out of a biological treatment tower (6) and the pollutant content is detected, and if the pollutant content in the nitrified liquid does not reach the standard, the nitrified liquid is treated by a multi-stage biological treatment tower (6);
and (3) carrying out oil-water-sludge separation treatment on the nitrified liquid with the pollutant content reaching the standard, and refluxing a part of separated sludge to the anoxic reaction area.
2. The combined wastewater and exhaust gas treatment method according to claim 1, wherein: the concentration of dissolved oxygen in the mixed solution is 0.1-0.5 mg/l.
3. The combined wastewater and exhaust gas treatment method according to claim 1, wherein: and gas generated in the anoxic hydrolysis acidification process is mixed with waste gas and flows upwards to the aerobic reaction zone.
4. The combined wastewater and exhaust gas treatment method according to claim 1, wherein: the dissolved amount of volatile organic compounds in the waste gas is in direct proportion to the concentration difference and the solubility of solute in gas phase and liquid phase.
5. The combined wastewater and exhaust gas treatment method according to claim 1, wherein: in the oil cement separation treatment process, the nitrified liquid is separated into floating oil sludge, clear water and sludge.
6. A combined waste water and exhaust gas treatment apparatus based on the combined waste water and exhaust gas treatment method according to any one of claims 1 to 5, characterized in that: comprises a solid-liquid separator (8), and the liquid inlet end of the solid-liquid separator (8) is communicated with at least one stage of biological treatment tower (6);
an aerobic reaction zone and an anoxic reaction zone are sequentially arranged in the biological treatment tower (6) from top to bottom, an air distribution chamber (6.6) is arranged between the aerobic reaction zone and the anoxic reaction zone, the air inlet end of the air distribution chamber (6.6) is communicated with a waste gas pollution source, and the water inlet end of the anoxic reaction zone is communicated with a waste water pollution source.
7. The combined wastewater and exhaust gas treatment apparatus according to claim 6, wherein: the anoxic reaction zone comprises an anoxic tank (6.3), a stirrer (6.4) is arranged in the anoxic tank (6.3), a nitrifying liquid receiving tank (6.5) is arranged between the anoxic tank (6.3) and the gas distribution chamber (6.6), the nitrifying liquid receiving tank (6.5) is an annular groove, an overflow plate (6.7) is arranged at the top opening of the nitrifying liquid receiving tank (6.5), and the nitrifying liquid receiving tank (6.5) is communicated with a water discharge end of the biological treatment tower (6);
the aerobic reaction zone comprises an aerobic reactor (6.8), the top of the aerobic reactor (6.8) is provided with a plurality of spray water distribution pipes (6.2), the spray water distribution pipes (6.2) are communicated with the anoxic tank (6.3) through pipelines, and the exhaust end of the biological treatment tower (6) is arranged at the top of the spray water distribution pipes (6.2).
8. The combined wastewater and exhaust gas treatment apparatus according to claim 7, wherein: a mud bucket (8.1) is arranged in the solid-liquid separator (8), a central guide cylinder (8.2) is arranged at the top of the mud bucket (8.1), a conical water baffle (8.3) is arranged between the mud bucket (8.1) and the central guide cylinder (8.2), the central guide cylinder (8.2) is communicated with the water outlet end of the biological treatment tower (6), an annular oil overflow groove (8.4) and an annular overflow weir (8.5) are sequentially arranged on the outer side of the central guide cylinder (8.2) from top to bottom, the annular oil overflow groove (8.4) and the annular overflow weir (8.5) are both positioned at the top of the bottom of the central guide cylinder (8.2), an oil-water separation annular guide baffle (8.6) is arranged between the annular oil overflow groove (8.4) and the annular overflow weir (8.5), and the oil-water separation annular guide baffle (8.6) is used for preventing oil sludge from floating to enter the annular overflow weir (8.5);
the annular oil overflow groove (8.4) is communicated with the oil discharge end of the solid-liquid separator (8), the oil discharge end of the solid-liquid separator (8) is communicated with a sludge drying treatment system, and the annular overflow weir (8.5) is communicated with the water discharge end of the solid-liquid separator (8).
9. The combined wastewater and exhaust gas treatment apparatus according to claim 8, wherein: the bottom opening of the mud bucket (8.1) is communicated with the mud discharging end of the solid-liquid separator (8), and the mud discharging end of the solid-liquid separator (8) is respectively communicated with the anoxic tank (6.3) and the sludge drying treatment system.
10. The combined wastewater and exhaust gas treatment apparatus according to claim 6, wherein: the multiple stages of biological treatment towers (6) are connected in series.
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| CN117865321B (en) * | 2024-01-30 | 2024-08-30 | 湖北展鹏电子材料有限公司 | Equipment and method for treating wastewater and dust-containing waste gas |
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| CN111825285A (en) * | 2020-08-18 | 2020-10-27 | 浙江海河环境科技有限公司 | Integrated device and method for biological treatment of organic sewage containing COD and nitrogen by A/O tower |
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| US5651892A (en) * | 1996-03-14 | 1997-07-29 | Deep Shaft Technology Inc. | Biodegradeable effluent nutrient removal |
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| CN112221343A (en) * | 2020-09-28 | 2021-01-15 | 成都达源环保工程有限公司 | Pharmaceutical chemical wastewater and organic waste gas desorption and cooling combined biological purification treatment method |
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| CN103253823A (en) * | 2013-05-02 | 2013-08-21 | 中国农业大学 | Method and system for realizing efficient wastewater treatment and waste methane gas oxidation together via artificial wetland |
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