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WO1981003034A1 - Systeme de desodorisation a etages - Google Patents

Systeme de desodorisation a etages Download PDF

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Publication number
WO1981003034A1
WO1981003034A1 PCT/US1981/000115 US8100115W WO8103034A1 WO 1981003034 A1 WO1981003034 A1 WO 1981003034A1 US 8100115 W US8100115 W US 8100115W WO 8103034 A1 WO8103034 A1 WO 8103034A1
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WO
WIPO (PCT)
Prior art keywords
scrubbing
air
solution
malodorous
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1981/000115
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English (en)
Inventor
R Rhees
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pacific Eng & Prod Co Nevada
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Pacific Eng & Prod Co Nevada
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pacific Eng & Prod Co Nevada filed Critical Pacific Eng & Prod Co Nevada
Publication of WO1981003034A1 publication Critical patent/WO1981003034A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine

Definitions

  • This invention relates to scrubber systems for the removal and/or destruction of malodorous compounds in gaseous discharges that are to be released to the atmosphere. More particularly, this invention relates to multiple stage wet scrubbers using an oxidant therein to partially remove or destroy malodorous compounds from the air.
  • malodorous substances e.g., reduced inorganic and/or organic sulfur compounds, nitrogen compounds, and other low molecular weight volatile substances
  • malodorous substances are commonly released to the atmosphere from sewage systems, sewage treatment plants, food processing plants, tanneries, pulp mills, etc. It is, of course, desirable, and now frequently required by State or Federal pollution control standards, that some or all of these substances be removed in part or in whole from the air so that the plant is not a nuisance to the population in the vicinity of the plant and does not damage the environment.
  • Aqueous scrubbing systems have long been used to reduce the concentration of malodorous substances in the air that is going to be released into the atmosphere at such a plant.
  • concentration of malodorous substances is rather low, or when the air basically has only one malodorous compound or a few very similar compounds
  • simple one stage scrubbers can be used to effectively reduce the concentration of the malodorous- substance (s) in the to-be-released air.
  • concentration of odorous compounds is relatively high, or, if the to-be-released air contains several different malo ⁇ dorous compounds, then the single stage scrubber is relatively ineffective and inadequate.
  • single stage scrubbers There are several types of single stage scrubbers now in use. The most basic of these is the single stage scrubber which comprises a simple configuration designed to bring odor- free water into intimate contact with the malodorous air that is being released. This may be done in a variety of ways, for example by sprays, packed towers, etc.
  • this single stage scrubber there are several known variations of this single stage scrubber that are employed in certain situations depending on the makeup of the malodorous substances in the air. For example, if the malodorous compounds are acidic, the addition of caustic to the scrubbing solution of a single stage scrubber will be of great benefit in reducing the malodorous substances in the air.
  • the caustic neutralizes the acidic odorous com ⁇ pounds, usually by converting such compounds into relatively soluble salts taken up by the scrubbing water.
  • a single scrubber system having caustic added thereto,- however, has the disad ⁇ vantage of being useful only when the air-to-be-released has a high relative concentration of acidic odorous substances and a relatively low concentration of alkaline odorous substances.
  • the addition of acid to the scrubbing solution of a single stage scrubber will increase the efficiency of the scrubber.
  • the acid neutralizes the alkaline odorous substances and converts these substances into salts having a relatively high solubility. This higher solubility enables the malodorous compounds to be more readily absorbed and removed from the air by the scrubb ⁇ ing solution.
  • 8.5-9.0 which is nearly the ideal pH for removing common malo ⁇ dorous acidic and basic volatile compounds.
  • a pH of 8.5-9.0 is ideal because it is alkaline to some acidic gases commonly found in discharge gases, such as H-S, while also being “acidic” to such commonly found gases as ammonia and organic amines.
  • the single stage scrubbing system becomes more proficient in remov ⁇ ing malodorous substances.
  • PEPCON system there are a significant number of sewage plants, manufacturing plants, etc., from which gases are emitted that have such a high con ⁇ centration of malodorous substances and/or such a wide variety of malodorous substances that neither the PEPCON system nor any of the single stage scrubber systems or compact multiple stage scrubbers now in use can achieve the desired degree of odor control. In such situations large, expensive and complex multiple stage scrubber systems must be used to adequately control the odors emitted at these sites.
  • this invention fulfills these needs in the art by providing a method of purifying air having there malodorous constituents, the steps comprising: providing a first scrubbing solution comprised of a salt brine containing an oxidant capable of reacting with at least a portion of the malodorous constituents in said air, conducting a first scrubb ing of said air, collecting the first scrubbing solution after said first scrubbing of said air, electrolyzing said first scrubbing solution so collected to thereby provide the desired oxidant content and using said electrolyzed solution to conduc said first scrubbing of said air, conducting a second scrubbin of the air scrubbed in said first scrubbing using an aqueous scrubbing medium, conducting a third scrubbing of the air scrubbed in said second scrubbing using an alkaline scrubbing medium, thereby to remove a substantial portion of all malo ⁇ dorous constituents in said air.
  • This invention combines air-purification processes known in the art in a new configuration and format to
  • This new compact multiple stage scrubber is smaller than existing multiple stage scrubbers built to handle malodorous air of the same composition, yet it efficiently cleanses these malodorous gas discharges. Use of this invention will result in great savings, in both capital and operating costs, to the owner of such a plant.
  • Figure 1 is a schematic flow plan of one embodiment of this invention.
  • Figure 2 is a schematic showing also a prescrubber usable with the system of Fig. 1 in accordance with the practice of this invention.
  • the air to be treated is collected from the site producing malodorous air by suitable ventilation ductwork (not shown) , and is drawn into the multiple stage scrubber by blower 10.
  • Blower 10 draws the air thru duct 74 into the bottom of the first scrubber tower 12 where the first stage of the air purification occurs.
  • scrubber tower 12 which is a conventional packed scrubbing tower in this embodi ⁇ ment having a conventional packing material 80 therein (e.g. , intalox polypropylene saddles, pall rings, or the like)
  • This first scrubbing solution is a salt brine (e.g., NaCl) having a salt concentra ⁇ tion of about 2 wt.% to 20 wt.%.
  • the contaminated brine scrubbing solution is continuously recirculated between first scrubber tower 12 and electrochemic cells 14 by taking the brine from basin 16 of first scrubber tower 12 and pumping it through electrochemical cells 14 using pump 18.
  • the brine passes through pipe 42, pump 18, pipe 44, electrochemical cells 14 and pipe 46 to the top of first scrub tower 12.
  • the brine enters the top of scrubber tower 12 throu pipe 48 to spray nozzle 50 which sprays the brine down first scrubber tower 12.
  • the solution then collects in basin 16 whereupon the solution is recycled as described above.
  • part of the scrubbing solution can be pumped directly from basin 16 into the top of first scrubber tower 12, bypassing electrochemical cells 14.
  • Electrochemical cells 14 are powered by rectifier 20.
  • Figure 1 shows two electrochemical cells but it will be under ⁇ stood that any number or size of cells may be used and a wide variety of cell configurations may be used. It is essential only that the cells be capable of generating enough oxidant to satisfy the oxidant demand of the contaminants in the malo ⁇ dorous gases to the system.
  • the brine passes through cells 14.
  • a part of the salt in the brine scrubbing solution converts into sodium hypo ⁇ chlorite when it passes through electrochemical cells 14 in accordance with the following reaction: ⁇
  • the hypo ⁇ chlorite solution emerging from the cells will have a concen ⁇ tration of about 0.02 wt.% to 0.7 wt.%.
  • concentration can be varied, of course, depending on the composition and concentration of the malodorous substances being removed.
  • the first scrubbing solution, containing the sodium hypochlorite flows downwardly through the packed scrubbing tower contacting, oxidizing and removing malodorous substances that are in the air that is being treated.
  • Second stage 23 is comprised of two principal ' sections, scrubbing chamber 26 and second scrubber tower 24.
  • Duct 22 connects the top of first scrubber tower 12 to the top of scrubber chamber 26.
  • the air in second stage 23 first passes downward through scrubbing section 26.
  • Scrubbing section 26 has baffle 28 therein under which the air must pass.
  • Scrubbing section 26 has therein spray nozzle 34 spraying a second scrubbing solution into contact with the air as the air passes through scrubbing section 26.
  • Scrubber chamber 26 may or may not contain conventional packing material under spray nozzle 34.
  • the second scrubbing solution is comprised of either fresh water or final effluent (from a waste water treatment plant) which enters the system through pipe 78. If final treated effluent is used its quality must approach that specified by the appropriate governmental environmental agencies and must not contain high concentrations of malodorous volatile sub ⁇ stances. This water, further removes malodorous, substances from the air.
  • final treated effluent is used its quality must approach that specified by the appropriate governmental environmental agencies and must not contain high concentrations of malodorous volatile sub ⁇ stances. This water, further removes malodorous, substances from the air.
  • end duct 30 whic connects the bottom of scrubbing chamber 26 to the bottom of second scrubbing tower 24, so that the air flows upwardly throu second scrubber tower 24.
  • second scrubber tower 24 which has conventional packing material 82 therein (e.g. intalox polypropylene saddles) . It is brought into contact with the second scrubbing solution being sprayed into second scrubber tower 24 from the top of second scrubber tower 24 by spray nozzle 32.
  • the second scrubbing solution is circulated within the system as follows. First,' the second scrubbing solution is collected in end duct 30 after being used in scrubbing chamber 26. It is then drawn from end duct 30 by pump 36 and . passed through pipe 58, pump 36, pipe 60, pipe intersection 38, and pipe 62 to the top of second scrubbing tower 24. The second scrubbing solution then passes through pipe 62 within second scrubber tower 24 to spray nozzle 32.
  • Caustic is added to the second scrubbing solution through pipe 76 at pipe
  • the caustic e.g., NaOH, Na ⁇ CO., or the like
  • the caustic is added either con ⁇ tinuously or intermittently, as required, to neutralize the acidic substances in the air which enters second stage 23.
  • the pH of the system can be adjusted to optimum value.
  • the optimum value is the pH level which will best remove the malodorous substances from the air. This will, of course, vary depending on the composition of the air being treated. Generally speaking, the caustic is added in an amount suf ⁇ ficient to bring the pH of the spray to about 8.0-9.0.
  • Sight glasses 70 and 72 are attached to end duct 30 and basin 16, respectively, in order for the plant operator to be able to determine the level of liquids therein.
  • the -volume of scrubbing solution in second scrubbing tower 24 and tower basin 30 is maintained by allowing the used scrubb ⁇ ing solution to overflow and discharge to drain from pipe 56 at the same rate that fresh water is entering scrubbing section 26 through pipe 78 and spray 34.
  • the volume of water entering and leaving the second scrubber tower can be varied as required to maintain the concentration of malodorous substances below an acceptable level in the recycling scrubbing solution.
  • the level of scrubbing solution in the first scrubbing tower 12 is maintained by a level control device, not shown, which adds fresh water when it is needed. Periodically every 4 to 6 weeks the scrubbing solution in the first scrubber towe 12 and basin 16 is removed and replaced by fresh brine solu- tion. This replacement is done to prevent accumulation of - oxidation products (sulfate in the case of H relieS) from exceeding their solubility in the scrubbing brine solution. Additional concentrated NaCl brine solution is added as required to main ⁇ tain the NaCl concentration in the scrubbing solution generall between 40 and 70 g/1 but no lower than 15 g/1. Concentrations greater than 70 g/1 up to 200 g/1 may be used.
  • prescrubber tower 54 is added to the system before scrubber tower 12.
  • This scrubber tower may be designed to cool down the air being treated and can remove some of the malodorous substances.
  • blower 10 for forcing malodorous air through the scrubber system may be located before the prescrubb as shown in Figure 2 or at any appropriate place in the ducts of the multiple scrubber system.
  • the malodorous air from vario process tanks or vessels is forced by blower 10 into basin 52 and then passes upward through the tower packing 60 where it is contacted by waste water treatment plant effluent or fresh water entering the tower through pipe 64, pipe 66, and spray nozzle 68.
  • Duct 92 connects the top of prescrubber tower 54 with the bottom of first scrubber tower 12. Malodorous substances in the air are removed up to the extent of their
  • A, W WII solubility in the scrubbing water and the hot malodorous gases are cooled to near ambient temperatures.
  • the scrubbing solu ⁇ tion is permitted to accumulate in basin 52 of the prescrubber 54 and then to overflow through pipe 86 to drain.
  • Sight glass 94 is attached to basin 52 for the purpose of determining the level of liquids in basin 52.
  • a portion -of the solution in basin 52 may be recycled through pipe 88 to a pump (not shown) and back to the top of the prescrubber 54 - through pipe 90.
  • the oxidative scrubber 12 may be constructed with the same configuration as the post oxidative scrubber (second stage 23) so that the downcomer section of duct 92 is eliminated and duct 92 is connected directly to a section identical to section 26 of stage 23.
  • the air passing out of the top of the prescrubber passes through duct 92 into the oxidative scrubber 12 where it is contacted by the oxidizing sodium hypochlorite brine solution and thence through scrubber section 26 and the post alkaline packed scrubber tower 24 before ' discharge to the atmosphere as previously described (Fig. 1) .
  • the compact multiple stage scrubb ⁇ ing systems disclosed by this invention have many advantages over the prior art single and multiple stage systems.
  • One advantage of this system is that the oxidant (e.g., sodium hypochlorite) concentrations can be higher and the pH lower in the first scrubber tower, if such is necessary to remove the alkaline malodorous substances, than in the known single stage scrubber system.
  • the hypochlorite concentra ⁇ tion and the pH level must be strictly controlled to prevent chlorine or hypochlorous acids from being released into the atmosphere.
  • hypo ⁇ chlorite concentration can be controlled at a relatively high level and the pH level at. a relatively low value, a portion of the oxidant is in the vapor phase, and is carried with the air being treated into the adjoining duct and the second stage. This actually acts as an extension of the first stage since the oxidant, in the vapor phase, continually reacts with the air throughout the system, removing the alkaline and oxidizable
  • a further advantage of this invention is that the fresh or plant water feed rate to the second scrubber tower can be varied between wide limits. When most of the malodorous sub ⁇ stances are destroyed by oxidation or are acidic, the feed rate can be kept low.
  • the feed rate can be increased up to a maximum value [approximately equal to the recycle rate of the pump circulation the scrubb ⁇ ing solution from the basin of the second (post oxidative) stage to the top of that stage] so that the scrubbing solution is well below saturation with malodorous substances and thus is best able to remove- odors by Henry's law effects.
  • a maximum value approximately equal to the recycle rate of the pump circulation the scrubb ⁇ ing solution from the basin of the second (post oxidative) stage to the top of that stage.
  • a further advantage of this invention is that the scrubbing solution will be mixed with the oxidant vapor from the first stage and deodorized by this vapor, it is not neces- sary for the plant operator to go to the expense of supplying sufficiently pure water to the beginning of the second stage.
  • Another advantage of this invention is that the duct top entry feature to the second scrubber stage eliminates much of the external duct work in a multiple stage system.
  • the downward passage of air through the first scrubbing chamber of stage 2 not only utilizes this volume for additional scrubb ⁇ ing but greatly reduces the probability in apparatus built according to this invention, of condensation and corrosion of the duct which connects the two stages.
  • the top entry feature also decreases the amount of ductwork required at groun level, thus providing better utilization of floor space in the plant containing this apparatus.
  • the first and second stages can be connected by a relatively short duct since it does not matter, in this invention, if the reactions of the oxidant in the first stage are completed before the air can enter the second stage.
  • the use of a short duct reduces the total floor area required for this scrubber which in turn reduces the construction and operating costs of the system.
  • Yet another advantage of this invention is the use of the electrochemical cells to produce the oxidant hypochlorite solution. The use of these cells enables the production rate of the oxidant to be easily varied simply by changing the
  • OMPI WIPO rectifier setting.
  • the production rate of the oxidant is pro ⁇ portional to the ammeter reading of the rectifier. This feature enables the oxidant level to be strictly controlled and widely varied. This allows the scrubbers built according to this invention to be used in a wide ⁇ variety of applications in which the malodorous substance_s:. ⁇ _o_be_.treated are different.
  • oxidant hypo ⁇ chlorite may be produced from a salt brine comprised of sodium chloride (NaCl) .
  • NaCl sodium chloride
  • Sodium chloride is rather inexpensive when compared to commercial oxidants, and since it is also the end product of the reaction within the first scrubber tower, it can be reused over and over, further reducing the operation costs of the system.
  • a further advantage of this invention is that it can effec- tively operate with little human operator assistance. Most of the hypochlorite produced accumulates in " he first stage until it is needed to remove oxidizable malodorous substances from the air. Thus, the operator can set the amperage of the rectifier at a slightly higher value than is necessary to re- move the oxidizable substances and the excess will accumulate in the first stage. This excess will be available for periods of use when the oxidant may be in high demand. Also, excesses - from periods of low oxidant demand will build up to provide an oxidant supply for periods of high oxidant demand.
  • Another advantage of this invention is that the volume of relatively pure water necessary to operate the system is significantly reduced relative to the water demanded by the prior art systems due to the extensive recycling of the scrubbe solutions and the small water requirements in the first stage. Also, high quality potable water is not needed. Both of these features greatly reduce the operating costs of the system.
  • a further advantage of this system is described with re ⁇ spect to Figure 2. In severe situations in which the malodoro content of the air to be treated is very high, and/or if the air coming into the system is at a very high temperature, the system of Figure 1 is compatible with the prescrubber of Figure 2 and may be used to cool, condense, and partially remov odorous substances from the air.
  • This prescrubber can be oper ⁇ ated at low cost by using the plant effluent on a once-through basis. If such a prescrubber were used in conjunction with this system, the first stage of the subject invention could be redesigned to have the same configuration as the second stage, that is, a top entry scrubbing chamber beside a bottom entry scrubber tower. Furthermore, if this three-stage system was used, it would be very versatile in times of equipment failure. Even if one of the stages was out of service, the other two stages could operate to adequately remove the malo ⁇ dorous substances. If either of the two stages of this inven ⁇ tion were out of service, the prescrubber could be operated as the oxidant stage.
  • Yet another advantage of this invention is that, due to the fact that the concentrations of the scrubbing solutions can be so varied within wide ranges, odor control can be achiev in many diverse situations by one system.
  • the oxidative first stage packed section consisted of a PVC pipe 17.5 inches i.d. and 60.5 inches high.
  • the internal packing was intalox polypropylene saddles, and the packed section was mounted on a tower basin, 17.5 inches inside diameter and 31 inches high.
  • a Hartzell duct axial fan was connected to the gas inlet of the tower basin to force the foul air through the scrubbing tower. Air flow rates to the tower varied from 400 scfm to 750 scfm depending on the connecting duct work and whether one or both pre- and post- oxidative scrubbers were used during test sequences.
  • the hypochlorite generator consisted of two 100 ampere PEPCON cells in series (or parallel) operated by a 200 ampere, 18 volt rectifier.
  • the scrubbing tower was connected to the electrolytic cells with the necessary pump and associated piping so that salt brine solution could be recirculated from the basin of the tower, through the pump, through the cells and to the top of the packed tower where it was then sprayed with a uniform pattern into the tower over the packed section.
  • the sodium hypochlorite reacting with oxidizable malodorous com ⁇ pounds in the air.
  • the oxidant generating capability of the unit was de on- strated as follows:
  • Hydrogen sulfide was then introduced into the intake air stream at various concentrations during periods of various sodium hypochlorite concentrations with the following results:
  • Example 2 The oxidative test scribber described above was tested at a sewage treatment plant treating domestic and industrial wastes.
  • the odor control unit was connected to a discharge duct carrying a mixture of air and gaseous discharges from a sludge thickener and a heat treat sludge dewatering process. This foul air was then passed through the single stage oxida ⁇ tive scrubber.
  • the foul air was known to contain hydrogen sulfide from the sludge thickener and a combination of low molecular weight volatile organic compounds (organic acids', aldehydes, ketones, esters and mercaptans) in high concentra- tion from the heat treat process.
  • the hypochlorite production efficiency of the electro ⁇ lytic system was checked (no foul air through the unit) and was found to be producing NaOCl at better than 85% current efficiency.
  • Foul process air was then passed through the operat ⁇ ing unit (735 scfm) .
  • the concentration of sulfur containing compounds (H 2 S and mercaptans) in the inlet foul air was 3 ppm.
  • the concentration of sulfur containing compounds in the outlet air was below the limit of detection.
  • the organic con- taminants:,in the foul air were significantly decreased but were not decreased below their net odor threshold.
  • the exit gases from the oxidative scrubber were found to contain (a) 1.7% C0 2 by volume (present in the foul air to the.
  • a post oxidative scrubber was then connected to the oxidative stage so that the foul air passed through the oxi ⁇ dative stage and then through the post oxidative 2nd stage.
  • the pH of the 2nd stage scrubber solution was maintained in the 8.0-8.5 range.
  • An estimation of odor removal by the two stage system was made by collecting samples of treated air from the second stage and subjecting a test panel to the air samples. It was found that odor could not be detected when the samples were diluted with small amounts of odor free air. Less than 50 volumes of odor free air was required to lower the concentration of contaminate in the air below odor thresho Such dilution naturally occurs rapidly on discharging treated air to atmosphere and thus such discharges are considered deodorized.
  • a prescrubber was inserted into the test system of Example 2 so that the foul air was first passed through the prescrubber, then through the oxidative scrubber and the post
  • ⁇ , WIP scrubber Water was used as the scrubbing solution for the prescrubber. It was determined that the prescrubber removed sufficient contaminants from the foul air to (1) decrease the oxidant demand in the oxidative stage by 20%; (2) decrease the aldehyde contaminants to the oxidative stage by about 50%; and (3) lower the sulfur containing compounds to the oxidative stage from 3 to 2 ppm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electrochemistry (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)

Abstract

Systeme d'epuration pour le traitement d'air malodorant comprenant deux ou plusieurs etages. Dans le premier etage, l'air passe au travers d'une premiere tour (12) d'epuration garnie et est epure a contre-courant par un ecoulement d'une solution d'epuration contenant de l'hypochlorite de sodium oxydant (NaOCl). L'hypochlorite de sodium est produit en faisant passer une saumure de sel (NaCl) au travers de cellules electrochimiques (14). Dans le deuxieme etage, l'air passe au travers d'une chambre d'epuration (16) et ensuite au travers d'une deuxieme tour d'epuration (24). Une deuxieme solution d'epuration entre en contact avec l'air dans la chambre d'epuration (26) et est recueillie dans la conduite de fond (30) reliant la chambre d'epuration (26) a la deuxieme tour d'epuration (24). La deuxieme solution d'epuration est ensuite recirculee jusqu'au sommet de la deuxieme tour d'epuration (24). Une substance caustique est ajoutee, en continu ou par intermittences, en fonction de la composition de l'air, a la deuxieme solution d'epuration avant son utilisation dans la deuxieme tour d'epuration (24).
PCT/US1981/000115 1980-04-25 1981-01-26 Systeme de desodorisation a etages Ceased WO1981003034A1 (fr)

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US14340280A 1980-04-25 1980-04-25
US143402 1980-04-25

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014004582A1 (fr) * 2012-06-28 2014-01-03 Steen Research, Llc Procédés et équipements pour traiter les flux gazeux odorants provenant de sites industriels
AT519109B1 (de) * 2016-12-20 2018-04-15 Pro Aqua Diamantelektroden Produktion Gmbh & Co Kg Verfahren zur Durchführung von Gaswäsche mittels einer Elektrolytlösung
US10898852B2 (en) 2016-08-15 2021-01-26 Stephen R. Temple Processes for removing a nitrogen-based compound from a gas or liquid stream to produce a nitrogen-based product
US11389763B2 (en) 2019-08-28 2022-07-19 Stephen R. Temple Methods for absorbing a targeted compound from a gas stream for subsequent processing or use
CN115738658A (zh) * 2022-11-27 2023-03-07 昆明理工大学 一种含磷硫恶臭气体的净化方法及其装置
WO2024033766A1 (fr) * 2022-08-09 2024-02-15 ITALCER S.p.A. Installation et procédé de purification de fumées et de récupération de matières premières secondaires

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US3494099A (en) * 1967-08-30 1970-02-10 Electro Sonic Pollution Contro Method of and apparatus for purifying polluted gases
US3764500A (en) * 1970-10-28 1973-10-09 Pacific Eng & Prod Co Of Nevad Method and apparatus for electrolytic treatment of sewage
US3897540A (en) * 1973-03-07 1975-07-29 American Air Filter Co Method of controlling reaction conditions in a sulfur dioxide scrubber
US3919391A (en) * 1973-10-09 1975-11-11 Ball Corp Electrostatic scrubber-precipitator
US3944401A (en) * 1973-05-08 1976-03-16 Metallgesellschaft Aktiengesellschaft Process for the removal of gaseous impurities from the exhaust gases of a contact-process plant for the production of sulfuric acid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3494099A (en) * 1967-08-30 1970-02-10 Electro Sonic Pollution Contro Method of and apparatus for purifying polluted gases
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WO2014004582A1 (fr) * 2012-06-28 2014-01-03 Steen Research, Llc Procédés et équipements pour traiter les flux gazeux odorants provenant de sites industriels
US10881756B2 (en) 2012-06-28 2021-01-05 Stephen R. Temple Methods and equipment for treatment of odorous gas streams from industrial plants
US10898852B2 (en) 2016-08-15 2021-01-26 Stephen R. Temple Processes for removing a nitrogen-based compound from a gas or liquid stream to produce a nitrogen-based product
AT519109B1 (de) * 2016-12-20 2018-04-15 Pro Aqua Diamantelektroden Produktion Gmbh & Co Kg Verfahren zur Durchführung von Gaswäsche mittels einer Elektrolytlösung
AT519109A4 (de) * 2016-12-20 2018-04-15 Pro Aqua Diamantelektroden Produktion Gmbh & Co Kg Verfahren zur Durchführung von Gaswäsche mittels einer Elektrolytlösung
US11389763B2 (en) 2019-08-28 2022-07-19 Stephen R. Temple Methods for absorbing a targeted compound from a gas stream for subsequent processing or use
WO2024033766A1 (fr) * 2022-08-09 2024-02-15 ITALCER S.p.A. Installation et procédé de purification de fumées et de récupération de matières premières secondaires
CN115738658A (zh) * 2022-11-27 2023-03-07 昆明理工大学 一种含磷硫恶臭气体的净化方法及其装置

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NO814429L (no) 1981-12-23
SE8107718L (sv) 1981-12-22

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