CN112138508A - Purification system and purification method for sulfur-containing organic waste gas - Google Patents
Purification system and purification method for sulfur-containing organic waste gas Download PDFInfo
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- CN112138508A CN112138508A CN202010936928.6A CN202010936928A CN112138508A CN 112138508 A CN112138508 A CN 112138508A CN 202010936928 A CN202010936928 A CN 202010936928A CN 112138508 A CN112138508 A CN 112138508A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/14—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 by absorption
- B01D53/1487—Removing organic compounds
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- C02F2303/02—Odour removal or prevention of malodour
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Abstract
The invention provides a purification system and a purification method for sulfur-containing organic waste gas. The purification system comprises an absorption tower and a membrane-carried biological deodorization reactor which are communicated; the membrane-carried biological deodorization reactor comprises a reactor body, a plurality of membrane components, a plurality of back-washing aeration heads, a first air supply unit and a second air supply unit; the first air supply unit is communicated with the membrane module, and the second air supply unit is communicated with the backwashing aeration head; the back washing aeration head is arranged towards the membrane component. The purification method comprises the following steps: 1) absorbing sulfur-containing organic waste gas to be treated by spray liquid; 2) introducing the waste liquid and sludge to be treated obtained in the step 1) into a membrane-carried biological deodorization reactor for active sludge domestication under the condition of oxygen supply pressure; 3) after the acclimation of the activated sludge is finished, continuously introducing the waste liquid to be treated, and performing membrane-carried biological deodorization under the conditions of oxygen supply pressure and aeration. The invention can realize that the removal efficiency of the sulfur-containing malodorous organic pollutants is more than or equal to 99.9 percent and the utilization efficiency of oxygen is more than or equal to 99 percent.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a purification system and a purification method for sulfur-containing organic waste gas.
Background
Along with the development of industrial production, the odor pollution is gradually intensified, the living environment of surrounding residents is seriously influenced, and a great deal of complaints of the residents are caused. In the human industrial production process, such as petroleum smelting plants, pesticide plants, rubber plants, paper mills, chemical plants and the like, a large amount of sulfur-containing malodorous organic pollutants are released, some urban public facilities such as refuse landfills and sewage treatment plants also generate sulfur-containing malodorous organic pollutants, and investigation shows that a certain refuse landfill gas collecting well contains high-concentration methyl sulfide (36847-3) Methyl mercaptan (15136-3) Carbon disulfide (8757-9009. mu.g/m)3) And dimethyl disulfide (2945-4561. mu.g/m)3). The sulfur-containing malodorous organic pollutants have the properties of low odor threshold, high toxicity and high corrosion, contain acidic components, have strong corrosivity and reducibility, can corrode metals and poison petroleum products. Its existence is more direct to make people produce discomfort, endangers human health: the respiratory system is influenced, and the existence of the malodor causes unpleasant feeling and strongly stimulates the sense organ to hinder the normal breathing; the circulation system is obstructed, and along with the breathing process, part of malodorous substances can enter the circulation system, for example, hydrogen sulfide has strong toxicity, and can obstruct the transportation of oxygen after entering blood in the circulation process, thereby influencing the normal physiological function of a human body; the digestive system is damaged, and the nausea, vomiting, anorexia and other symptoms can be caused by frequent contact with malodorous substances, so that the digestive deterioration, the endocrine disturbance and the like are caused; affecting the nervous system and causing poisoning of nerves by prolonged exposure to malodour, e.g. CS2Has neurotoxicity and damage to the brain; the organic acid-base compound liquid can damage human organs, and can corrode organs such as eyes and skin of a human body after being contacted with acidic malodorous substances for a long time, so that the eyes are damaged, and the normal vision of the human is influenced; part of the organic malodorous substances can also cause poisoning,Cancerous and even dead. Therefore, in order to enable residents to have healthier production and life, the treatment of sulfur-containing malodorous organic pollutants needs to be solved urgently.
The traditional stink removing method mainly comprises three aspects of physics, biology and chemistry, the physical process mainly comprises water absorption, physical adsorption, cooling and condensation, masking, dilution and the like, the stink gas is removed by adopting the physical method, the gas is not really removed, and only is transferred or masked, so that the stink can be removed by further subsequent treatment. The chemical process mainly comprises wet chemical absorption, chemical adsorption, chemical oxidation, catalytic oxidation and the like, and the problems of secondary pollution, high operation cost and the like exist when malodorous gas is removed by a chemical method. Biological deodorization has attracted extensive attention due to its advantages of high purification efficiency, low investment cost, no secondary pollution, etc. At present, research on removing sulfur-containing malodor by a biological method is mainly focused on a biological trickling filter, and the problems of easy blockage and low gas-liquid mass transfer efficiency exist.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention provides a system and a method for purifying sulfur-containing organic waste gas, which can achieve an efficiency of removing sulfur-containing malodorous organic pollutants of not less than 99.9%, and an efficiency of utilizing oxygen of not less than 99%. In order to achieve the above and other related objects, a first aspect of the present invention provides a system for purifying sulfur-containing organic waste gas, comprising an absorption tower and a membrane-supported biological deodorization reactor which are communicated with each other; the membrane-carried biological deodorization reactor comprises a reactor body, a plurality of membrane components, a plurality of backwashing aeration heads, a first air supply unit and a second air supply unit;
the membrane module and the back washing aeration head are arranged in the reactor body;
the first air supply unit is communicated with the membrane module, and the second air supply unit is communicated with the backwashing aeration head; the back washing aeration head is arranged towards the membrane module.
The second aspect of the present invention provides a method for purifying sulfur-containing organic waste gas, comprising the steps of:
1) absorbing sulfur-containing organic waste gas to be treated by spray liquid;
2) introducing the waste liquid and sludge to be treated obtained in the step 1) into a membrane-carried biological deodorization reactor for active sludge domestication under the condition of oxygen supply pressure;
3) after the acclimation of the activated sludge is finished, continuously introducing the waste liquid to be treated, and performing membrane-carried biological deodorization under the conditions of oxygen supply pressure and aeration.
Preferably, the spray liquid is selected from at least one of ammonium chloride, dipotassium hydrogen phosphate, magnesium sulfate, calcium chloride and ferrous sulfate.
Preferably, the pH value of the spraying liquid is 9-10.
Preferably, in the step 2), VSS of the sludge is 10-20 g/L, such as 10-15 g/L or 15-20 g/L.
Preferably, in the step 2), the concentration of the sulfur-containing pollutants in the waste liquid to be treated is 2-5 mmol/L.
Preferably, in the step 2), the hydraulic retention time is 12-24 h.
Preferably, in the step 2), the oxygen gas supply pressure is 6-8 psi.
Preferably, in the step 2), the acclimation time is 3-4 days.
Preferably, in the step 3), the concentration of the sulfur-containing pollutants in the waste liquid to be treated is 0.1-100 mmol/L.
Preferably, in step 3), the supply pressure of the oxygen is 1 to 20psi, such as 1 to 10psi or 10 to 20 psi.
Preferably, in step 3), the oxygen supply pressure is dynamically adjusted according to the concentration of the sulfur-containing contaminants in the feed water. The dynamic adjustment can be performed according to the following method: setting the gas supply pressure of initial oxygen to be 5-10 psi, when the concentration of the sulfur-containing pollutants in the inlet water is 0.1-5 mmol/L, controlling the corresponding valve by the control unit to adjust the gas supply pressure of the oxygen to be 3-5 psi, and if the concentration of the sulfur-containing pollutants rises and is 5mmol/L higher per liter, controlling the corresponding valve by the control unit to increase the gas supply pressure of the oxygen by one psi and to 20psi at most.
Preferably, in the step 3), the oxygen supply pressure is dynamically fed back and adjusted by monitoring the concentration of the sulfur-containing pollutants in the effluent of the membrane-borne biological deodorization reactor. The dynamic feedback can be performed as followsAdjusting: the concentration of sulfur-containing pollutants in the effluent is 10-4-10-3At mmol/L, the supply pressure of oxygen is not changed, and the concentration of sulfur-containing pollutants in the effluent is 10-3-10-2At mmol/L, the supply pressure of oxygen is increased by 2psi, and the concentration of sulfur-containing pollutants in the effluent is 10-2-10-1At mmol/L, the supply pressure of oxygen is increased by 4psi, and the concentration of sulfur-containing pollutants in the effluent is 10-1At-1 mmol/L, the oxygen feed pressure increased by 10 psi.
Preferably, in step 3), the membrane thickness is adjusted by periodic aeration.
Preferably, in the step 3), the hydraulic retention time is 30-240 min, such as 30-60 min or 60-240 min.
Preferably, in the step 3), the aeration scouring strength is 10-20L/(s.m)2)。
Preferably, in the step 3), the aeration flushing time is 2-5 min.
The technical scheme has the following beneficial effects:
(1) the invention has the advantages of compact device, small occupied area, simple and convenient operation, high automation degree, easy popularization and the like.
(2) The invention can realize the regulation of the thickness of the biomembrane and has high metabolic activity for efficiently degrading microorganisms.
(3) The invention can realize the cyclic utilization of the spray liquid, reduce the oxygen supply amount and has low operation cost.
(4) The method can dynamically adjust the oxygen supply amount according to the water inlet concentration and the water outlet concentration of the sulfur-containing pollutants, improves the oxygen utilization efficiency while efficiently purifying, and can realize the removal efficiency of the sulfur-containing malodorous organic pollutants of more than or equal to 99.9 percent and the oxygen utilization efficiency of more than or equal to 99 percent at the highest.
Drawings
FIG. 1 shows a diagram of a system for purifying sulfur-containing organic waste gas according to the present invention: the figure shows a main view structure schematic diagram of the membrane-carried biological deodorization reactor.
FIG. 2 is a schematic top view of the membrane-supported biological deodorization reactor in the purification system according to the present invention.
Reference numerals
1 absorption tower
11 spray liquid inlet
12 waste gas inlet
13 waste liquid outlet
14 gas phase outlet
2 membrane carried biological deodorization reactor
21 reactor body
22 membrane module
23 back flush aeration head
24 first air supply unit
241 oxygen storage tank
242 first conduit
243 second conduit
244 first valve
245 second valve
25 second air supply unit
251 blower
252 third conduit
253 third valve
26 water inlet
261 water inlet valve
262 first contaminant detection unit
27 water inlet well
28 water inlet channel
29 water distribution hole
210 water outlet
211 water outlet well
212 gas phase exhaust port
213 Water-retaining skirt board
214 baffle
215 mud well
2151 mud discharging hole
216 sludge discharge pipe
217 control unit
3 spray liquid unit
4 pH detection unit
5 first blower
Detailed Description
The technical solution of the present invention is illustrated by specific examples below. It is to be understood that one or more method steps mentioned in the present invention do not exclude the presence of other method steps before or after the combination step or that other method steps may be inserted between the explicitly mentioned steps; it should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
A purification system of sulfur-containing organic waste gas is shown in figure 1 and comprises an absorption tower 1 and a membrane-carried biological deodorization reactor 2 which are communicated; the membrane-carried biological deodorization reactor 2 comprises a reactor body 21, a plurality of membrane modules 22, a plurality of back-washing aeration heads 23, a first air supply unit 24 and a second air supply unit 25;
the membrane module 22 and the back-washing aeration head 23 are arranged in the reactor body 21;
the first air supply unit 24 is communicated with the membrane module 22, and the second air supply unit 25 is communicated with the backwashing aeration head 23; the backwash aeration head 23 is disposed toward the membrane module 22.
In a preferred embodiment, the absorption tower 1 is provided with a spray liquid inlet 11, an exhaust gas inlet 12, a waste liquid outlet 13 and a gas phase outlet 14, the spray liquid inlet 11 and the gas phase outlet 14 are positioned above the exhaust gas inlet 12, and the waste liquid outlet 13 is communicated with the membrane-supported biological deodorization reactor 2.
In a preferred embodiment, the purification system further comprises a spray liquid unit 3, and the spray liquid unit 3 is communicated with the absorption tower 1.
In a preferred embodiment, the device further comprises a pH detection unit 4, and the pH detection unit 4 is arranged in the spray liquid unit 3.
In a preferred embodiment, the purification system further comprises a first blower 5 for introducing the sulfur-containing organic waste gas into the absorption tower 1, wherein the first blower 5 is communicated with the absorption tower 1.
In a preferred embodiment, as shown in fig. 1 and 2, the reactor body 21 is cylindrical, the membrane-supported biological deodorization reactor further includes a water inlet 26, a water inlet well 27, a water inlet channel 28 and a plurality of water distribution holes 29, the water inlet 26 is disposed on the reactor body 21, the water inlet 26 is communicated with the water inlet well 27, the water inlet channel 28 is disposed around the inner wall of the reactor body, and the water distribution holes 29 are disposed on the water inlet channel 28.
In a preferred embodiment, a horizontally arranged water retaining skirt 213 and a vertically arranged baffle 214 are arranged below the water inlet channel 28, one end of the water retaining skirt 213 is connected with the inner side wall of the reactor body, and a gap is arranged between the other end of the water retaining skirt 213 and the baffle 214 so as to form a water flowing channel. This design does benefit to the water and evenly gets into the reactor body in, does benefit to the subsidence of suspended solid.
In a preferred embodiment, the water inlet 26 is further provided with a water inlet valve 261 and/or a first contaminant detection unit 262.
In a preferred embodiment, the water distribution holes 29 are arranged from sparse to dense in the water flow direction, which is favorable for uniform water distribution.
In a preferred embodiment, the membrane-supported biological deodorization reactor further includes a water outlet 210 and a water outlet well 211, the water outlet well 211 is disposed in the reactor body 21, the water outlet 210 is disposed on the reactor body 21, and the water outlet 210 is communicated with the water outlet well 211.
In a preferred embodiment, the membrane-mounted biological deodorization reactor further comprises a mud outlet well 215 and a mud discharge pipe 216, wherein the mud outlet well 215 is arranged below the water outlet well 211, a mud discharge hole 2151 is formed in the mud outlet well 215, and the mud outlet well 215 is communicated with the mud discharge pipe 216.
In a preferred embodiment, a second pollutant detection unit is further disposed on the water outlet 210.
In a preferred embodiment, the reactor body 21 is cylindrical, and the plurality of membrane modules 22 are disposed in the reactor body 21 in an annular array.
In a preferred embodiment, the membrane modules 22 are arranged from dense to sparse in the radial direction from the periphery of the inlet water to the center of the outlet water, which facilitates efficient degradation of contaminants.
In a preferred embodiment, the first gas supply unit 24 includes an oxygen storage tank 241, a first pipeline 242 and a plurality of second pipelines 243, each second pipeline 243 is communicated with each membrane module 22, and the oxygen storage tank 241 is communicated with the plurality of second pipelines 243 through the first pipeline 242.
In a preferred embodiment, the first air supply unit 24 further includes a first valve 244, and the first valve 244 is disposed on the first pipe 242.
In a preferred embodiment, the first air supply unit 24 further comprises a plurality of second valves 245, and each second valve 245 is disposed on each second pipe 243.
In a preferred embodiment, the second air supply unit 25 comprises a blower 251 and a third pipeline 252, wherein the blower 251 is communicated with the plurality of backwash aeration heads 23 through the third pipeline 252.
In a preferred embodiment, the second air supply unit 25 further includes a third valve 253, and the third valve 253 is disposed on the third pipeline 252.
In a preferred embodiment, the membrane-supported biological deodorization reactor further comprises a gas phase discharge port 212, and the gas phase discharge port 212 is disposed at the top of the reactor body 21.
In a preferred embodiment, the carrier membrane in the membrane module 22 is a non-porous hollow fiber membrane.
In a preferred embodiment, the membrane-borne bio-deodorization reactor 2 further comprises a control unit 217, wherein the control unit 217 is in signal connection with at least one selected from the group consisting of the pH detection unit 4, the water inlet valve 261, the first contaminant detection unit 262, the first valve 244, the third valve 253, and the second contaminant detection unit.
Example 1
The purification system of sulfur-containing organic waste gas used in the examples is shown in fig. 1 and fig. 2, and specifically comprises the following steps:
(1) introducing sulfur-containing organic waste gas into an absorption tower through a blower, and absorbing pollutants by using a spraying liquid to realize the transfer of the pollutants from a gas phase to a liquid phase;
(2) adjusting the concentration of pollutants in the effluent waste liquid of the absorption tower to 5mmol/L (sulfydryl), pumping the pollutants and sludge of a secondary sedimentation tank of a sewage treatment plant with 15g/L of VSS into a membrane-carried biological deodorization reactor for membrane hanging, wherein the hydraulic retention time is 24 hours, the oxygen aeration partial pressure is 8psi, and the domestication is completed after 4 days;
(3) pumping the effluent waste liquid of the absorption tower into a membrane-borne biological deodorization reactor, controlling the oxygen pressure to be 10psi, dynamically adjusting the oxygen supply amount according to the concentration of the influent pollutants, increasing the oxygen pressure, wherein the oxygen pressure is 5mmol/L higher per liter, and the control unit controls a corresponding valve to adjust the oxygen supply pressure to be increased by one psi to be maximally 20 psi;
(4) adjusting the hydraulic retention time to 60 min;
(5) monitoring the concentration of pollutants in the effluent water of the membrane reactor, and feeding back and adjusting the oxygen supply: the concentration of sulfur-containing pollutants in the effluent is 10-4-10-3At mmol/L, the supply pressure of oxygen is not changed, and the concentration of sulfur-containing pollutants in the effluent is 10-3-10-2At mmol/L, the supply pressure of oxygen is increased by 2psi, and the concentration of sulfur-containing pollutants in the effluent is 10-2-10-1At mmol/L, the supply pressure of oxygen is increased by 4psi, and the concentration of sulfur-containing pollutants in the effluent is 10-1At-1 mmol/L, the oxygen feed pressure increased by 10 psi.
(6) The flushing intensity of the air flow is controlled to be 20L/(s.m 2), the flushing time is 5min, and the frequency is 1 time per month. The amount of pollutants treated by the device reaches 150mol S.m-3·d-1The removal efficiency of sulfur-containing malodorous organic pollutants reaches 98 percent, and the utilization efficiency of oxygen reaches 99 percent.
Example 2
The purification system of sulfur-containing organic waste gas used in the examples is shown in fig. 1 and fig. 2, and specifically comprises the following steps:
(1) introducing sulfur-containing organic waste gas into an absorption tower through a blower, and absorbing pollutants by using a spray liquid to realize the conversion of the pollutants from a gas phase to a liquid phase;
(2) adjusting the concentration of pollutants in the effluent waste liquid of the absorption tower to 5mmol/L (sulfydryl), pumping the pollutants and sludge of a secondary sedimentation tank of a sewage treatment plant with 15g/L of VSS into a membrane-carried biological deodorization reactor for membrane hanging, wherein the hydraulic retention time is 24 hours, the oxygen aeration partial pressure is 8psi, and the domestication is completed after 4 days;
(3) pumping the effluent waste liquid of the absorption tower into a membrane-borne biological deodorization reactor, controlling the oxygen pressure to be 1psi, adjusting the oxygen aeration amount according to the concentration of the influent pollutants, increasing the oxygen pressure, wherein each liter is 5mmol/L, and controlling a corresponding valve to adjust the oxygen supply pressure to increase by one psi to 20psi at most by a control unit;
(4) the hydraulic retention time is adjusted to be 60min,
(5) monitoring the concentration of pollutants in the effluent water of the membrane reactor, and feeding back and adjusting the oxygen aeration rate: the concentration of sulfur-containing pollutants in the effluent is 10-4-10-3At mmol/L, the supply pressure of oxygen is not changed, and the concentration of sulfur-containing pollutants in the effluent is 10-3-10-2At mmol/L, the supply pressure of oxygen is increased by 2psi, and the concentration of sulfur-containing pollutants in the effluent is 10-2-10-1At mmol/L, the supply pressure of oxygen is increased by 4psi, and the concentration of sulfur-containing pollutants in the effluent is 10-1At-1 mmol/L, the oxygen feed pressure increased by 10 psi.
(6) Control gasThe flushing intensity is 20L/(s.m 2), the flushing time is 5min, and the frequency is 1 time per month. The amount of pollutants treated by the device reaches 130mol S.m-3·d-1The removal efficiency of sulfur-containing malodorous organic pollutants is 97 percent, and the utilization efficiency of oxygen is 99.9 percent.
Example 3
The purification system of sulfur-containing organic waste gas used in the examples is shown in fig. 1 and fig. 2, and specifically comprises the following steps:
(1) introducing sulfur-containing organic waste gas into an absorption tower through a blower, and absorbing pollutants by using a spray liquid to realize the conversion of the pollutants from a gas phase to a liquid phase;
(2) adjusting the concentration of pollutants in the effluent waste liquid of the absorption tower to 5mmol/L (sulfydryl), pumping the pollutants and sludge of a secondary sedimentation tank of a sewage treatment plant with 15g/L of VSS into a membrane-carried biological deodorization reactor for membrane hanging, wherein the hydraulic retention time is 24 hours, the oxygen aeration partial pressure is 8psi, and the domestication is completed after 4 days;
(3) pumping the effluent waste liquid of the absorption tower into a membrane-borne biological deodorization reactor, controlling the oxygen pressure to be 10psi, adjusting the oxygen aeration amount according to the concentration of the influent pollutants, increasing the oxygen pressure, wherein each liter is 5mmol/L, and controlling a corresponding valve to adjust the oxygen supply pressure to increase by one psi to 20psi at most by a control unit;
(4) adjusting the hydraulic retention time to be 30 min;
(5) monitoring the concentration of pollutants in the effluent water of the membrane reactor, and feeding back and adjusting the oxygen aeration rate: the concentration of sulfur-containing pollutants in the effluent is 10-4-10-3At mmol/L, the supply pressure of oxygen is not changed, and the concentration of sulfur-containing pollutants in the effluent is 10-3-10-2At mmol/L, the supply pressure of oxygen is increased by 2psi, and the concentration of sulfur-containing pollutants in the effluent is 10-2-10-1At mmol/L, the supply pressure of oxygen is increased by 4psi, and the concentration of sulfur-containing pollutants in the effluent is 10-1At-1 mmol/L, the oxygen feed pressure increased by 10 psi.
(6) The flushing intensity of the air flow is controlled to be 20L/(s.m 2), the flushing time is 5min, and the frequency is 1 time per month. The pollutant amount treated by the device reaches 180mol S.m-3·d-1The removal efficiency of the sulfur-containing malodorous organic pollutants is95 percent and the oxygen utilization efficiency is 99.5 percent.
Example 4
The purification system of sulfur-containing organic waste gas used in the examples is shown in fig. 1 and fig. 2, and specifically comprises the following steps:
(1) introducing sulfur-containing organic waste gas into an absorption tower through a blower, and absorbing pollutants by using a spray liquid to realize the conversion of the pollutants from a gas phase to a liquid phase;
(2) adjusting the concentration of pollutants in the effluent waste liquid of the absorption tower to 5mmol/L (sulfydryl), pumping the pollutants and sludge of a secondary sedimentation tank of a sewage treatment plant with 15g/L of VSS into a membrane-carried biological deodorization reactor for membrane hanging, wherein the hydraulic retention time is 24 hours, the oxygen aeration partial pressure is 8psi, and the domestication is completed after 4 days;
(3) pumping the effluent waste liquid of the absorption tower into a membrane-borne biological deodorization reactor, controlling the oxygen pressure to be 10psi, adjusting the oxygen aeration amount according to the concentration of the influent pollutants, increasing the oxygen pressure, wherein each liter is 5mmol/L, and controlling a corresponding valve to adjust the oxygen supply pressure to increase by one psi to 20psi at most by a control unit;
(4) adjusting the hydraulic retention time to 240 min;
(5) monitoring the concentration of pollutants in the effluent water of the membrane reactor, and feeding back and adjusting the oxygen aeration rate: the concentration of sulfur-containing pollutants in the effluent is 10-4-10-3At mmol/L, the supply pressure of oxygen is not changed, and the concentration of sulfur-containing pollutants in the effluent is 10-3-10-2At mmol/L, the supply pressure of oxygen is increased by 2psi, and the concentration of sulfur-containing pollutants in the effluent is 10-2-10-1At mmol/L, the supply pressure of oxygen is increased by 4psi, and the concentration of sulfur-containing pollutants in the effluent is 10-1At-1 mmol/L, the oxygen feed pressure increased by 10 psi.
(6) The flushing pressure of the air flow is controlled to be 20L/(s.m 2), the flushing time is 5min, and the frequency is 1 time per month. The device can treat pollutants up to 100mol S.m-3·d-1The removal efficiency of sulfur-containing malodorous organic pollutants is 99 percent, and the utilization efficiency of oxygen is 99.5 percent.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A purification system of sulfur-containing organic waste gas is characterized by comprising an absorption tower (1) and a membrane-carried biological deodorization reactor (2) which are communicated; the membrane-carried biological deodorization reactor (2) comprises a reactor body (21), a plurality of membrane modules (22), a plurality of back flush aeration heads (23), a first air supply unit (24) and a second air supply unit (25);
the membrane module (22) and the back washing aeration head (23) are arranged in the reactor body (21);
the first air supply unit (24) is communicated with the membrane module (22), and the second air supply unit (25) is communicated with the backwashing aeration head (23); the back washing aeration head (23) is arranged towards the membrane module (22).
2. The system for purifying a sulfur-containing organic waste gas according to claim 1, further comprising at least one of the following technical features:
1) the absorption tower (1) is provided with a spraying liquid inlet (11), a waste gas inlet (12), a waste liquid outlet (13) and a gas phase outlet (14), the spraying liquid inlet (11) and the gas phase outlet (14) are positioned above the waste gas inlet (12), and the waste liquid outlet (13) is communicated with the membrane-borne biological deodorization reactor (2);
2) the purification system also comprises a spray liquid unit (3), and the spray liquid unit (3) is communicated with the absorption tower (1);
3) the purification system also comprises a first air blower (5) used for introducing sulfur-containing organic waste gas into the absorption tower (1), wherein the first air blower (5) is communicated with the absorption tower (1);
4) the reactor body (21) is cylindrical, the membrane-supported biological deodorization reactor further comprises a water inlet (26), a water inlet well (27), a water inlet channel (28) and a plurality of water distribution holes (29), the water inlet (26) is arranged on the reactor body (21), the water inlet (26) is communicated with the water inlet well (27), the water inlet channel (28) is arranged on the inner wall of the reactor body in a surrounding mode, and the water distribution holes (29) are arranged on the water inlet channel (28);
5) the membrane-carried biological deodorization reactor further comprises a water outlet (210) and a water outlet well (211), wherein the water outlet well (211) is arranged in the reactor body (21), the water outlet (210) is arranged on the reactor body (21), and the water outlet (210) is communicated with the water outlet well (211);
6) the reactor body (21) is cylindrical, and the membrane modules (22) are arranged in the reactor body (21) in an annular array;
7) the first gas supply unit (24) comprises an oxygen storage tank (241), a first pipeline (242) and a plurality of second pipelines (243), each second pipeline (243) is communicated with each membrane module (22), and the oxygen storage tank (241) is communicated with the plurality of second pipelines (243) through the first pipeline (242);
8) the second air supply unit (25) comprises an air blower (251) and a third pipeline (252), wherein the air blower (251) is communicated with the plurality of backwashing aeration heads (23) through the third pipeline (252);
9) the membrane-carried biological deodorization reactor also comprises a gas phase discharge port (212), and the gas phase discharge port (212) is arranged at the top of the reactor body (21);
10) the carrier membrane in the membrane module (22) is a non-porous hollow fiber membrane.
3. The system for purifying sulfur-containing organic waste gas according to claim 2, characterized in that 2) further comprises a pH detection unit (4), wherein the pH detection unit (4) is disposed in the spray liquid unit (3).
4. The system for purifying a sulfur-containing organic waste gas according to claim 2, wherein the characteristic 4) further comprises at least one of the following technical characteristics:
41) a horizontally arranged water retaining skirt board (213) and a vertically arranged baffle board (214) are arranged below the water inlet channel (28), one end of the water retaining skirt board (213) is connected with the inner side wall of the reactor body, and a gap is arranged between the other end of the water retaining skirt board and the baffle board (214) so as to form a water flowing channel;
42) a water inlet valve (261) and/or a first pollutant detection unit (262) are/is further arranged on the water inlet (26);
43) the water distribution holes (29) are arranged in a dense mode from sparse to dense along the water flow direction.
5. The system for purifying a sulfur-containing organic waste gas according to claim 2, wherein the characteristic 5) further comprises at least one of the following technical characteristics:
51) the membrane-carried biological deodorization reactor further comprises a mud outlet well (215) and a mud discharge pipe (216), wherein the mud outlet well (215) is arranged below the water outlet well (211), a mud discharge hole (2151) is formed in the mud outlet well (215), and the mud outlet well (215) is communicated with the mud discharge pipe (216);
52) and a second pollutant detection unit is also arranged on the water outlet (210).
6. The system for purifying a sulfur-containing organic waste gas according to claim 2, further comprising at least one of the following technical features:
61) in the characteristic 6), the membrane modules (22) are arranged from dense to sparse along the radial direction from the periphery of the inlet water to the center of the outlet water;
71) in feature 7), the first air supply unit (24) further includes a first valve (244), and the first valve (244) is disposed on the first pipe (242);
72) in the characteristic 7), the first gas supply unit (24) further includes a plurality of second valves (245), and each second valve (245) is provided on each second pipe (243).
7. The system for purifying a sulfur-containing organic waste gas as claimed in claim 2, wherein in the feature 8), said second gas supply unit (25) further comprises a third valve (253), and said third valve (253) is provided on said third pipe (252).
8. The system for purifying sulfur-containing organic waste gas according to any one of claims 1 to 7, wherein said membrane-borne biological deodorization reactor (2) further comprises a control unit (217), and said control unit (217) is in signal connection with at least one selected from the group consisting of said pH detection unit (4), said water inlet valve (261), said first contaminant detection unit (262), said first valve (244), said third valve (253), and a second contaminant detection unit.
9. A method for purifying sulfur-containing organic waste gas is characterized by comprising the following steps:
1) absorbing sulfur-containing organic waste gas to be treated by spray liquid;
2) introducing the waste liquid and sludge to be treated obtained in the step 1) into a membrane-carried biological deodorization reactor for active sludge domestication under the condition of oxygen supply pressure;
3) after the acclimation of the activated sludge is finished, continuously introducing the waste liquid to be treated, and performing membrane-carried biological deodorization under the conditions of oxygen supply pressure and aeration.
10. The method according to claim 9, further comprising at least one of the following technical features:
1) the spraying liquid is selected from at least one of ammonium chloride, dipotassium hydrogen phosphate, magnesium sulfate, calcium chloride and ferrous sulfate;
2) the pH value of the spraying liquid is 9-10;
3) in the step 2), VSS of the sludge is 10-20 g/L;
4) in the step 2), the concentration of sulfur-containing pollutants in the waste liquid to be treated is 2-5 mmol/L;
5) in the step 2), the hydraulic retention time is 12-24 h;
6) in the step 2), the oxygen supply pressure is 6-8 psi;
7) in the step 2), the domestication time is 3-4 days;
8) in the step 3), the concentration of sulfur-containing pollutants in the waste liquid to be treated is 0.1-100 mmol/L;
9) in the step 3), the supply pressure of the oxygen is 1-20 psi;
10) in the step 3), dynamically adjusting the oxygen supply pressure according to the concentration of the sulfur-containing pollutants in the inlet water;
11) in the step 3), the oxygen supply pressure is dynamically fed back and adjusted by monitoring the concentration of sulfur-containing pollutants in the effluent of the membrane-borne biological deodorization reactor;
12) in the step 3), the film thickness is adjusted by regular aeration;
13) in the step 3), the hydraulic retention time is 30-240 min;
14) in the step 3), the aeration scouring strength is 10-20L/(s.m)2)；
15) In the step 3), the aeration and washing time is 2-5 min.
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| CN115028318A (en) * | 2022-05-26 | 2022-09-09 | 同济大学 | System and method for completely mineralizing halogenated organic pollutants in sewage |
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