DE3919124A1 - METHOD FOR SEPARATING POLYCYLCIC HYDROCARBONS AND HEAVY METALS FROM EXHAUST GASES - Google Patents

METHOD FOR SEPARATING POLYCYLCIC HYDROCARBONS AND HEAVY METALS FROM EXHAUST GASES

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Publication number
DE3919124A1
DE3919124A1 DE19893919124 DE3919124A DE3919124A1 DE 3919124 A1 DE3919124 A1 DE 3919124A1 DE 19893919124 DE19893919124 DE 19893919124 DE 3919124 A DE3919124 A DE 3919124A DE 3919124 A1 DE3919124 A1 DE 3919124A1
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Prior art keywords
heavy metals
exhaust gases
gases
adsorbent
filter
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DE19893919124
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German (de)
Inventor
Mehdi Dr Ing Haji-Javad
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HAJI JAVAD MEHDI DR ING
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HAJI JAVAD MEHDI DR ING
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Priority to DE19893919124 priority Critical patent/DE3919124A1/en
Publication of DE3919124A1 publication Critical patent/DE3919124A1/en
Priority to AU58597/90A priority patent/AU5859790A/en
Priority to PCT/EP1990/000921 priority patent/WO1990015657A1/en
Withdrawn legal-status Critical Current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
    • B01D53/02—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 adsorption, e.g. preparative gas chromatography
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/30—Halogen; Compounds thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00—Treatment devices
    • F23J2219/30—Sorption devices using carbon, e.g. coke

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention concerns a process for the removal of traces of pollutants from the exhaust gases from waste incineration plants. The invention calls for the gases, pre-cleaned in a gas purification plant to remove dust, acid gases (HCl, HF, SOx), heavy metals and NOx, to be freed of the remaining polycyclic hydrocarbons (e.g. dioxins and furanes) and heavy metals (e.g. Hg, Cd) by means of a combined adsorption/filtration process. To this end, the gases, at a temperature of about 70 to 160 DEG C, are mixed in a reactor (C4) with suitable adsorption agents (e.g. activated charcoal, molecular sieves or slaked lime) and subsequently passed through a fibrous filter (F2). The pollutants are bound to the adsorption agent in the reactor and subsequently in the filter cake on the fibrous filter.

Description

Die polyzyklischen Kohlenwasserstoffe, z. B. halogenierte Dibenzodioxine und Dibenzofurane (PCDD und PCDF) oder polychlorierte Benzole und Phenole, sowie Schwermetalle (z. B. Hg, Cd) können mit den Abgasen der Feuerungsanlagen, besonders von Müll- und Sondermüllverbrennungsanlagen, emittieren.The polycyclic hydrocarbons, e.g. B. halogenated Dibenzodioxins and dibenzofurans (PCDD and PCDF) or polychlorinated benzenes and phenols, as well as heavy metals (e.g. Hg, Cd) can be used with the exhaust gases from the combustion plants, especially of waste and special waste incineration plants, emit.

Die polyzyklischen Kohlenwasserstoffe, die stark gesundheitsschädigend wirken (krebserregend), können bei der Verbrennung durch komplexe Rekombinationsreaktionen aus organischen und anorganischen Verbindungen entstehen. Diese Verbindungen können nur begrenzt in nachgeschalteten Reinigungsanlagen (mit dem Flugstaub in Elektrofilter oder in der Abgaswaschanlage) abgeschieden werden. Auch einige Schwermetalle (Hg, Cd), die ebenfalls gesundheitsschädigend sind, können bei den vorliegenden Abgastemperaturen zum Teil im gasförmigen Zustand oder als Feinstäube und Aerosole aus der Abgasreinigungsanlage emittieren.The polycyclic hydrocarbons that are extremely harmful to health can have a carcinogenic effect when burned through complex recombination reactions from organic and inorganic compounds arise. These connections can only be used to a limited extent in downstream cleaning systems (with the dust in the electrostatic precipitator or in the exhaust gas washing system) be deposited. Also some heavy metals (Hg, Cd), which are also harmful to health can be found in the existing exhaust gas temperatures in part in the gaseous state or as fine dust and aerosols from the exhaust gas cleaning system emit.

Durch diese Erfindung können alle konventionell anwendbaren Abgasreinigungsverfahren hinsichtlich der Abscheidung von gesundheitsschädigenden organischen Verbindungen und Schwermetallen optimiert werden.This invention allows all of them to be used conventionally Exhaust gas purification process with regard to the separation of harmful organic compounds and Heavy metals can be optimized.

In den Bildern 1 und 2 sind beispielhaft das erfundene Verfahren in Verbindung mit einer konventionellen Abgasreinigungsanlage hinter einer Müllverbrennung, bestehend aus einem Elektrofilter zur Staubabscheidung, einer zweistufigen Wäsche zur Abscheidung von sauren Gasen (HCl, HF, SOx) und einer SCR-Anlage zur NOx-Reduzierung, dargestellt. Die aus der Verbrennungsanlage kommenden Abgase werden mit ca. 200-350°C zwecks Staubabscheidung zuerst zu einem Elektrofilter geführt. Abhängig von der Auslegung des E-Filters und der Eigenschaften des Abgases und des Staubs können hohe Staubabscheidegrade bzw. sehr niedrige Staubkonzentrationen (ca. 50-30 mg/m³, i. N.) erreicht werden. Hierbei kann gleichzeitig ein hoher Anteil der polyzyklischen Kohlenwasserstoffe und Schwermetalle mit der Flugasche abgeschieden werden. Da diese Stoffe sich aber zum Teil an Feinstäube und Aerosolen, die den E-Filter verlassen, anlagern oder zum Teil in gasförmigem Zustand befinden, ist ihre weitgehende Entfernung im E-Filter nicht möglich. Figures 1 and 2 are examples of the invented process in connection with a conventional exhaust gas cleaning system behind a waste incineration system, consisting of an electrostatic filter for dust separation, a two-stage scrubber for the separation of acidic gases (HCl, HF, SOx) and an SCR system for NOx Reduction shown. The exhaust gases coming from the incinerator are first led to an electrostatic precipitator at approx. 200-350 ° C for the purpose of dust separation. Depending on the design of the e-filter and the properties of the exhaust gas and dust, high degrees of dust separation or very low dust concentrations (approx. 50-30 mg / m³, in general) can be achieved. At the same time, a high proportion of the polycyclic hydrocarbons and heavy metals can be separated with the fly ash. However, since some of these substances accumulate on fine dust and aerosols that leave the E-filter or are partly in a gaseous state, their extensive removal in the E-filter is not possible.

Nach der Entstaubung werden die Abgase über einen Wärmetauscher zu einem zweistufigen Wäscher geführt, wo durch die Abkühlung auf ca. 60-70°C und den Einsatz von Absorptionsmitteln (NaOH, Ca(OH)2) die sauren Abgasbestandteile (HCl, HF, SOx) und weitere Schwermetallanteile abgeschieden werden. Die verbleibenden Kohlenwasserstoffe und Schwermetalle verlassen die Waschanlage als Feinstäbe, Aerosole oder Gase und werden, wenn keine zusätzlichen Maßnahmen vorgesehen, mit den Abgasen aus dem Schornstein emittieren.After dedusting, the exhaust gases are passed through a heat exchanger led to a two stage scrubber where by cooling to about 60-70 ° C and the use of absorbents  (NaOH, Ca (OH) 2) the acidic exhaust gas components (HCl, HF, SOx) and further heavy metal fractions are deposited. The remaining hydrocarbons and heavy metals the washing system as fine rods, aerosols or gases and if no additional measures are provided, with the exhaust gases emit from the chimney.

Erfindungsgemäß sollen die Emissionen dieser Schadstoffe durch ein kombiniertes Adsorptions-Filtrations-Verfahren verhindert werden. Für diesen Zweck wird das Abgas nach der Wäsche in einem Wärmetauscher auf ca. 70 bis 150°C aufgeheizt und in einem Reaktor mit feinverteilten pulverförmigen Adsorptionsmittel intensiv vermischt. Der Reaktor kann z. B. aus einer zirkulierenden Wirbelschicht bestehen, durch die eine große Berührungsfläche zwischen Abgas und Adsorptionsmittel realisiert werden kann. Hier erfolgt bereits eine Teilanlagerung der polyzyklischen Kohlenwasserstoffe und der Schwermetalle an das Adsorptionsmittel. Das Abgas aus dem Reaktor wird zu einem nachgeschalteten Gewebefilter geführt, wo sich das Adsorptionsmittel unter Bildung eines Filterkuchens an den Filterschläuchen abscheidet. Da das Abgas zwangsweise durch den Filterkuchen strömen muß, findet hier gleichzeitig mit der Entstaubung eine weitgehende adsorptive Abscheidung der restlichen polyzyklischen Kohlenwasserstoffe und der Schwermetalle statt.According to the emissions of these pollutants through a combined adsorption-filtration process be prevented. For this purpose, the exhaust gas is after the laundry is heated to approx. 70 to 150 ° C in a heat exchanger and in a reactor with finely divided powder Adsorbent mixed intensively. The reactor can e.g. B. consist of a circulating fluidized bed through which a large contact area between exhaust gas and adsorbent can be realized. A partial addition is already taking place here polycyclic hydrocarbons and heavy metals to the adsorbent. The exhaust gas from the reactor is led to a downstream fabric filter, where the adsorbent to form a filter cake separates the filter bags. Because the exhaust gas is forced must flow through the filter cake here a largely adsorptive at the same time as the dedusting Separation of the remaining polycyclic hydrocarbons and the heavy metals instead.

Als Adsorptionsmittel können alle selektiv wirkenden Stoffe, z. B. Aktivkohle, Kalkhydrat, Molekularsiebe und Natriumsulfit, mit einer hohen spezifischen Oberfläche zum Einsatz kommen.All selectively acting substances, e.g. B. activated carbon, hydrated lime, molecular sieves and sodium sulfite, with a high specific surface.

Durch die Rückführung des im Gewebefilter abgeschiedenen Adsorptionsmittels zum Reaktor wird eine hohe Staubkonzentration (ca. 5000 bis 50 000 mg/m³, i. N.) und folglich ein hoher Kontakt zwischen Adsorptionsmittel und Abgas hergestellt. Je nach betrieblichen Erfordernissen wird zur Ausschleusung von adsorbierten Schadstoffen ein kleiner Anteil der rückgeführten Menge durch frisches Additiv ersetzt. Die abgezweigte Teilmenge kann für die Entsorgung zur Verbrennungsanlage geführt werden, wo die gebundenen organischen Verbindungen thermisch zersetzt und die Schwermetalle wieder freigesetzt und letztlich in den nachgeschalteten Anlagen (E-Filter und Abgaswäsche) abgeschieden werden.By returning the one separated in the fabric filter Adsorbent to the reactor becomes a high dust concentration (approx. 5000 to 50 000 mg / m³, i.N.) and consequently a high contact between adsorbent and exhaust gas produced. Depending on the operational requirements Removal of adsorbed pollutants a little Proportion of the returned quantity due to fresh additive replaced. The branched portion can be used for disposal be led to the incinerator where the bound organic compounds thermally decomposed and the heavy metals released again and ultimately in the downstream Systems (e-filter and exhaust gas scrubbing) separated will.

Wie aus den Bildern 1 und 2 hervorgeht, kann das Verfahren entweder nach der Abgaswäsche oder nach der SCR-Anlage (katalytische NOx-Reduktion mittels Ammoniak) direkt vor dem Schornstein zur Anwendung kommen. Für letztgenannten Fall können aus der SCR-Anlage stammende Ammoniakreste und mögliche Ammoniumsalze (NH4HSO4, (NH4)2SO4) ebenfalls mit abgeschieden werden. As is apparent from Figures 1 and 2, the method may be in front of the chimney for use either according to the exhaust gas scrubbing or after the SCR system (catalytic NOx reduction using ammonia). In the latter case, ammonia residues and possible ammonium salts (NH4HSO4, (NH4) 2SO4) from the SCR system can also be separated.

Das erfundene Verfahren zeichnet sich durch eine hohe Flexibilität und Anpassungsfähigkeit an die jeweiligen Betriebsverhältnisse aus. Je nach Anwendungsfall und vorliegenden Randbedingungen können Adsorptionsvorgang und Anlagenbetrieb durch folgende Maßnahmen optimiert werden:The invented process is characterized by a high degree of flexibility and adaptability to the respective operating conditions out. Depending on the application and the present Boundary conditions can include the adsorption process and plant operation can be optimized by the following measures:

  • - Optimierung durch den Einsatz von verschiedenen selektiv wirkenden Adsorptionsmitteln in beliebigen Mengenverhältnissen (z. B. 20% Aktivkohle und 80% Kalkhydrat),- Optimization through the use of different selective acting adsorbents in any proportions (e.g. 20% activated carbon and 80% hydrated lime),
  • - Optimierung durch die Anpassung des Abgas/Adsorptionsmittel- Kontakts durch die Regelung der vom Gewebefilter zurückgeführten Feststoffmengen,- Optimization by adapting the exhaust gas / adsorbent Contact by regulating the return of the fabric filter Amounts of solids,
  • - Optimierung durch die Anpassung des Verhältnisses von frischem zurückgeführtem Adsorptionsmittel,- Optimization by adjusting the ratio of fresh recycled adsorbent,
  • - Optimierung durch die Anpassung der Dicke des Filterkuchens durch entsprechende Regelung der Abreinigungszeiten des Gewebefilters,- Optimization by adjusting the thickness of the filter cake through appropriate regulation of cleaning times the fabric filter,
  • - Optimierung durch die Einstellung der Betriebstemperatur in einem relativ weiten Bereich von ca. 70 bis 160°C.- Optimization by setting the operating temperature in a relatively wide range from approx. 70 to 160 ° C.

Claims (4)

1. Verfahren zur Abscheidung von gesundheitsschädigenden polyzyklischen Kohlenwasserstoffen (z. B. Dioxine und Furane) und Schwermetallen aus den Abgasen von Abfallverbrennungsanlagen (z. B. Müll- und Sondermüllverbrennung), dadurch gekennzeichnet, daß die von Staub, HCl, HF, SOx, NOx und Schwermetallen vorgereinigten Abgase durch Adsorption/Filtration im Temperaturbereich von 70-160°C von den restlichen polyzyklischen Kohlenwasserstoffen und Schwermetallen befreit werden.1. Process for the separation of health-damaging polycyclic hydrocarbons (e.g. dioxins and furans) and heavy metals from the waste gases from waste incineration plants (e.g. waste and hazardous waste incineration), characterized in that the dust, HCl, HF, SOx, NOx and heavy metals pre-cleaned exhaust gases are freed from the remaining polycyclic hydrocarbons and heavy metals by adsorption / filtration in the temperature range of 70-160 ° C. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet,
daß die vorgereinigten Abgase zuerst in einem Reaktor (C 4) mit feinverteilten Adsorptionsmitteln vermischt werden und anschließend zu einem filternden Abscheider (F 2) geführt werden, wo auf dem Filtergewebe ein Adsorptionsmittelkuchen erzeugt wird, den die Abgase durchströmen müssen,
daß bei der Durchströmung des Filterkuchens eine weitgehende adsorptive Abscheidung von polyzyklischen Kohlenwasserstoffen und Schwermetallen stattfindet.2. The method according to claim 1, characterized in that
that the pre-cleaned exhaust gases are first mixed in a reactor (C 4 ) with finely divided adsorbents and then passed to a filtering separator (F 2 ), where an adsorbent cake is generated on the filter fabric, which the exhaust gases have to flow through,
that a large adsorptive separation of polycyclic hydrocarbons and heavy metals takes place when flowing through the filter cake. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß in Abhängigkeit von den örtlichen Randbedingungen die Abscheideleistung des Verfahrens durch Art, Menge und Zusammensetzung des Adsorptionsmittels, Abgas/Additiv- Mengenverhältnis, Dicke des Filterkuchens und Reaktionstemperatur optimiert wird. 3. The method according to claim 2, characterized, that depending on the local boundary conditions the separation performance of the process by type, quantity and composition of the adsorbent, exhaust gas / additive Quantity ratio, thickness of the filter cake and Reaction temperature is optimized.   4. Verfahren nach Anspruch 1, 2 und 3, dadurch gekennzeichnet,
daß als Adsorptionsmittel Stoffe mit einer hohen Selektivität (z. B. Aktivkohle, Molekularsiebe, Natriumsulfid, Kalkhydrat) in unterschiedlichen Mengenverhältnissen eingesetzt werden können,
daß zur Minimierung des Adsorptionsmittelverbrauchs und der anfallenden Reststoffmengen, das im Filter abgeschiedene Adsorptionsmittelgemisch im Kreislauf geführt und nur wegen der Ausschleusung der adsorbierten Schadstoffe geringfügig durch frisches Additiv ersetzt wird,
daß die vom Rezirkulationskreislauf ausgeschleuste Teilmenge zur thermischen Zersetzung von polyzyklischen Kohlenwasserstoffen zu der Verbrennungsanlage geführt wird.4. The method according to claim 1, 2 and 3, characterized in
that substances with a high selectivity (e.g. activated carbon, molecular sieves, sodium sulfide, hydrated lime) can be used as adsorbents in different proportions,
that in order to minimize the adsorbent consumption and the accumulated residues, the adsorbent mixture separated in the filter is circulated and only slightly replaced by fresh additive only because of the removal of the adsorbed pollutants,
that the portion discharged from the recirculation circuit is led to the thermal decomposition of polycyclic hydrocarbons to the incinerator.
DE19893919124 1989-06-12 1989-06-12 METHOD FOR SEPARATING POLYCYLCIC HYDROCARBONS AND HEAVY METALS FROM EXHAUST GASES Withdrawn DE3919124A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19893919124 DE3919124A1 (en) 1989-06-12 1989-06-12 METHOD FOR SEPARATING POLYCYLCIC HYDROCARBONS AND HEAVY METALS FROM EXHAUST GASES
AU58597/90A AU5859790A (en) 1989-06-12 1990-06-12 Process for the separation of polycyclic hydrocarbons and heavy metals from waste gases
PCT/EP1990/000921 WO1990015657A1 (en) 1989-06-12 1990-06-12 Process for the separation of polycyclic hydrocarbons and heavy metals from waste gases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893919124 DE3919124A1 (en) 1989-06-12 1989-06-12 METHOD FOR SEPARATING POLYCYLCIC HYDROCARBONS AND HEAVY METALS FROM EXHAUST GASES

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DE3919124A1 true DE3919124A1 (en) 1990-01-18

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AU (1) AU5859790A (en)
DE (1) DE3919124A1 (en)
WO (1) WO1990015657A1 (en)

Cited By (20)

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DE3935904A1 (en) * 1988-10-28 1990-05-03 Ftu Gmbh Modified calcium hydroxide powder for heavy metal removal from gas
DE4113597A1 (en) * 1990-04-28 1991-10-31 Babcock Anlagen Ag Purification of waste gas contg. prods. of incomplete combustion - by adsorption on zeolite
DE4012982A1 (en) * 1990-04-24 1991-10-31 Ftu Gmbh Removing harmful (in)organic substance from gases - by addn. of finely divided substance with active surface and filtration
DE4012887A1 (en) * 1990-04-23 1991-10-31 Nymic Anstalt METHOD FOR PURIFYING EXHAUST GAS, ESPECIALLY FROM WASTE INCINERATION PLANTS
DE4034498A1 (en) * 1990-09-06 1992-03-12 Metallgesellschaft Ag METHOD FOR SEPARATING HEAVY METALS AND DIOXINES FROM COMBUSTION EXHAUST GASES
DE4100179A1 (en) * 1991-01-05 1992-07-09 Kroeber Heinz Joachim Removal of low concns. of air impurities near public highway - comprises mixing fine grained adsorbents with air, then passing air adsorbent-impurity mixt. through suspension filter
DE4124844A1 (en) * 1991-07-26 1993-01-28 Krc Umwelttechnik Gmbh METHOD FOR CLEANING STRONG SMOKE GASES WITH MERCURY
DE4212071A1 (en) * 1992-04-10 1993-10-14 Berlin Consult Gmbh Purifier for gas, esp. pyrolysis gas, contg. easily volatile heavy metals
DE4233303C1 (en) * 1992-10-03 1994-01-20 Metallgesellschaft Ag Process for the separation of dioxins and furans from waste gases from incineration plants
US5352647A (en) * 1990-05-02 1994-10-04 Ftu Gmbh Composition for separating out noxious substances from gases and exhaust gases
DE4317756A1 (en) * 1993-05-28 1995-01-12 Krc Umwelttechnik Gmbh Process for purifying mercury-polluted flue gases in particular from sewage sludge incineration plants
EP0484954B1 (en) * 1990-11-08 1995-06-21 MARTIN GmbH für Umwelt- und Energietechnik Process for separating ammonia from gases, in particular exhaust gases from combustion processes
DE4415025A1 (en) * 1994-04-29 1995-07-06 Abb Management Ag Removal dioxin and mercury@ from waste gas produced by an incinerator
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Cited By (24)

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Publication number Priority date Publication date Assignee Title
DE3935904A1 (en) * 1988-10-28 1990-05-03 Ftu Gmbh Modified calcium hydroxide powder for heavy metal removal from gas
DE4012887A1 (en) * 1990-04-23 1991-10-31 Nymic Anstalt METHOD FOR PURIFYING EXHAUST GAS, ESPECIALLY FROM WASTE INCINERATION PLANTS
DE4012982A1 (en) * 1990-04-24 1991-10-31 Ftu Gmbh Removing harmful (in)organic substance from gases - by addn. of finely divided substance with active surface and filtration
DE4113597A1 (en) * 1990-04-28 1991-10-31 Babcock Anlagen Ag Purification of waste gas contg. prods. of incomplete combustion - by adsorption on zeolite
EP0455152A1 (en) * 1990-04-28 1991-11-06 Deutsche Babcock Anlagen Gmbh Process for the purification of exhaust gases
US5352647A (en) * 1990-05-02 1994-10-04 Ftu Gmbh Composition for separating out noxious substances from gases and exhaust gases
DE4034498A1 (en) * 1990-09-06 1992-03-12 Metallgesellschaft Ag METHOD FOR SEPARATING HEAVY METALS AND DIOXINES FROM COMBUSTION EXHAUST GASES
EP0484954B1 (en) * 1990-11-08 1995-06-21 MARTIN GmbH für Umwelt- und Energietechnik Process for separating ammonia from gases, in particular exhaust gases from combustion processes
DE4100179A1 (en) * 1991-01-05 1992-07-09 Kroeber Heinz Joachim Removal of low concns. of air impurities near public highway - comprises mixing fine grained adsorbents with air, then passing air adsorbent-impurity mixt. through suspension filter
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