DE3224350A1 - Process for wet purification of contaminated exhaust air - Google Patents

Process for wet purification of contaminated exhaust air

Info

Publication number
DE3224350A1
DE3224350A1 DE3224350A DE3224350A DE3224350A1 DE 3224350 A1 DE3224350 A1 DE 3224350A1 DE 3224350 A DE3224350 A DE 3224350A DE 3224350 A DE3224350 A DE 3224350A DE 3224350 A1 DE3224350 A1 DE 3224350A1
Authority
DE
Germany
Prior art keywords
exhaust air
activated carbon
washing water
washing
scrubbing
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.)
Withdrawn
Application number
DE3224350A
Other languages
German (de)
Inventor
Herbert 7014 Kornwestheim Kohler
Ulrich 7321 Albershausen Lachenmayer
Egbert Dr. 7310 Plochingen Paul
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
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 Daimler Benz AG filed Critical Daimler Benz AG
Priority to DE3224350A priority Critical patent/DE3224350A1/en
Publication of DE3224350A1 publication Critical patent/DE3224350A1/en
Withdrawn legal-status Critical Current

Links

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
    • B01D53/46—Removing components of defined structure
    • B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
    • 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
    • B01D53/14—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
    • 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
    • B01D53/14—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
    • B01D53/1425—Regeneration of liquid absorbents
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84—Biological processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Treating Waste Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The application describes an improved process for the wet purification of exhaust air contaminated by organic solvents, the exhaust air being scrubbed with scrubbing water in a manner known per se and the scrubbing water then being regenerated in a biological manner and reused for scrubbing. It has been found that the scrubbing efficiency of the scrubbing water can be considerably increased if the scrubbing water contains suspended activated charcoal, preferably 2 to 4 kg per m<3> having a grain size of at most 0.045 mm.

Description

Daimler-Benz Aktiengesellschaft Daim 13 781/^ Daimler-Benz Aktiengesellschaft Daim 13 781 / ^

Stuttgart EPT Dr.WpfaStuttgart EPT Dr.Wpfa

28.6.1982June 28, 1982

"Verfahren zur Naßreinigung von verunreinigter Abluft»"Process for wet cleaning of contaminated exhaust air"

Die Reinigung von Abluft durch Auswaschen mit Wasser z.B. in Riesel- oder Sprühtürmen und Abbau der aufgenommenen Schadstoffe durch biologische Oxidation ist allgemein bekannt und kommt vielfach zur Anwendung. Die gelösten oder kolloidalen organischen Verbindungen und teilweise auch anorganische Verbindungen werden von auf den Rieselkörpern oder im Abwasser befindlichen Mikroorganismen (Bakterien, Pilzen, Protozoen) als Nahrungsquelle benutzt und oxidiert (vgl. DE-AS 25 k7 675, DE-OS'n 26 56 689, 20 20 207, US-PS 22 00 58I, FR-OS 21 75 92« NL-OS 71 02 133).The purification of exhaust air by washing it out with water, for example in trickle or spray towers, and breaking down the pollutants absorbed by biological oxidation is well known and is widely used. The dissolved or colloidal organic compounds and in some cases also inorganic compounds are used and oxidized by microorganisms (bacteria, fungi, protozoa) found on the trickle bodies or in the wastewater (see DE-AS 25 k7 675, DE-OS'n 26 56 689, 20 20 207, US-PS 22 00 58I, FR-OS 21 75 92, NL-OS 71 02 133).

Eine Behandlung von Abluftströmen mit hohen AnteiLen an schied wasserlöslichen gasförmigen Bestandteilen ist in derartigen biologischen Abluftreinigungsanlagen nur mit unverhältnismäßij hohem Aufwand möglich. Bereits relativ geringe Konzentrationei an diesen schwer löslichen Verbindungen im Abwasser haben bereits einen negativen Einfluß auf die Auswaschleistung des Absorbers. Um eine ausreichende Reinigung der Abluft zu ermög-A treatment of exhaust air streams with high proportions made a difference water-soluble gaseous components is in such biological exhaust air purification systems only with disproportionate high effort possible. Already relatively low concentration egg these poorly soluble compounds in the wastewater already have a negative impact on the leaching performance of the Absorbers. In order to enable sufficient cleaning of the exhaust air

31J liehen, müßten daher enorme Mengen an Waschwasser im Kreis geführt werden, um die für eine genügende Absorption erforder-3 1 J borrowed, enormous amounts of washing water would therefore have to be circulated in order to achieve the

— 3 —- 3 -

ta nta n

- 3 - Daim 13 - 3 - daim 13

liehe geringe Konzentration dieser Schadstoffe im Abwasser sicherzustellen. Im Gegensatz dazu steht jedoch, daß die Ab baugeschwindigkeit bei der biologischen Oxidation, d.h. bei der biologischen Regeneration des Waschwassers, eine Funktion der Konzentration dieser Substanzen im Waschwasser dar stellt. Bei geringen Konzentrationen ist eine unverhältnismäßig lange Verweilzeit des Waschwassers in der biologische! Oxidationsstufe erforderlich, da nur oberhalb einer gewiajex Schadstoffkonzentration eine ausreichend schnelle Oxidation stattfindet. Da die Verwendung einer großen Waschwassermenge verbunden mit einer langen Verweilzeit dieser großen Menge in der biologischen Oxidationsstufe einen enormen Aufwand darstellen, wird mitunter auf eine vollständige Abluftreinigung verzichtet.borrowed low concentration of these pollutants in wastewater to ensure. In contrast to this, however, is that the rate of degradation in the biological oxidation, i.e. at the biological regeneration of the wash water, a function of the concentration of these substances in the wash water represents. At low concentrations there is a disproportionately long retention time of the washing water in the biological! Oxidation level required, since oxidation is only sufficiently rapid above a certain concentration of pollutants takes place. Because the use of a large amount of washing water combined with a long residence time of this large amount in the biological oxidation stage, an enormous effort represent, a complete exhaust air purification is sometimes dispensed with.

Die Aufgabe der Erfindung besteht daher darin, ein Verfahret zu finden, das eine gute Abluftreinigung erlaubt und das die Verwendung einer geringeren Menge an Waschflüssigkeit sowie eine schnellere biologische Oxidation der Waschflüssigkeit ermöglicht.The object of the invention is therefore to find a Verfahret which allows good exhaust air purification and which Use of a smaller amount of washing liquid and faster biological oxidation of the washing liquid enables.

Diese Aufgabe wird durch das in den Patentansprüchen beschri bene Verfahren gelöst.This object is achieved by the method described in the claims.

Durch die in dem Waschwasser suspendierte Aktivkohle läßt sich die Auswaschleistung erheblich erhöhen. Es wird eine Pufferkapazität für die schlecht wasserlöslichen gasförmigen Abluftbestandteile geschaffen, so daß eine wesentliche Verbesserung der Reinigungsleistung des Absorbers erzielt wird.The active charcoal suspended in the washing water enables the washing performance to be increased considerably. It will be a Buffer capacity created for the poorly water-soluble gaseous exhaust air components, so that a substantial improvement the cleaning performance of the absorber is achieved.

Diese Verbesserung wird bereits bei Zugabe geringer Mengen Aktivkohle deutlich. Für den praktischen Betrieb wird manThis improvement is already evident when adding small amounts of activated carbon. For practical operation one will

Daim 13 781ADaim 13 781A

_ 3_ 3

Aktivkohlekonzenti"? t-j onen von 2 bis 4: kg· m . Die Verwendung größerer Mengen Aktivkohle ist im allgemeinen nicht erforderlich, kann aber in Ausnahmefällen bei der Entfernung besonders schwer löslicher Schadstoffe von Nutzen sein.
10Activated charcoal concentrations from 2 to 4: kg · m. The use of larger amounts of activated charcoal is generally not necessary, but in exceptional cases it can be useful in removing pollutants that are particularly difficult to dissolve.
10

Die Aktivkohle muß während der Reinigung in dem Waschwasser suspendiert sein, d.h., die Aktivkohle liegt in Pulverform vor. Mit Vorteil kann so bei diesem Verfahren Aktivkohleabrieb eingesetzt werden. Um eine gleichmäßige Verteilung der Aktivkohle in dem Waschwasser zu ermöglichen, sollte die Korngröße der Aktivkohle 0,0^5 mm nicht überschreiben. Liegt die Korngröße oberhalb dieses Wertes, ist eine zu große mechanische Arbeit für die Aufrechterhaltung der Suspension erforderlich. Bevorzugt wird Aktivkohle einer Korngröße von weniger als 0,045 mm, da sie sich besonders leicht in Suspension halten läßt. Möglichst fein verteilte Aktivkohle wird ferner auch deshalb bevorzugt, weil mit sinkender Korngröße die Absorptionsfähigkeit des Waschwassers steigt.The activated carbon must be suspended in the washing water during cleaning, i.e. the activated carbon is in powder form before. In this way, activated carbon abrasion can advantageously be used in this process. To be even To enable distribution of the activated carbon in the washing water, the grain size of the activated carbon should not be 0.0 ^ 5 mm overwrite. If the grain size is above this value, the mechanical work is too great for maintenance of the suspension required. Activated carbon with a grain size of less than 0.045 mm is preferred, because it is particularly easy to keep in suspension. Activated carbon that is as finely distributed as possible is also used for this reason preferred because the absorption capacity decreases with decreasing grain size of the wash water increases.

Für eine gute Absorption sollte die Aktivkohle ferner eine große Oberfläche besitzen. Aktivkohlepulver mit einer Oberfläche nacl
den bevorzugt.For good absorption, the activated carbon should also have a large surface. Activated carbon powder with a surface nacl
preferred.

2 Oberfläche nach BET von mindestens 9^0 m pro Gramm wer-2 BET surface area of at least 9 ^ 0 m per gram

Die an die Aktivkohle adsorbierten Schadstoffe werden ebenso wie die im Wasser gelösten Schadstoffe biologisch abgebaut, so daß die Aktivkohle stets regeneriert wird und nicht aus dem Waschwasser entfernt zu werden braucht.The pollutants adsorbed on the activated carbon, like the pollutants dissolved in the water, become biological degraded, so that the activated carbon is always regenerated and does not need to be removed from the washing water.

Es entstehen somit keine zusätzlichen Kosten für die Regenerierung der Aktivkohle»There are therefore no additional costs for regeneration the activated carbon »

- 5 - Daiin 13 781/4 - 5 - Daiin 13 781/4

Beispielexample

Zur Reinigung einer Abluft, die mit Xylolen bis zu Κόπο
zentrationen von 250 mg/m belastet war, wurden parallel zwei Versuchsanlagen eingesetzt. Die Untersuchungsbedingungen waren für beide Systeme konstant: Luftmengenstrom 300 l/h, Waschflüssigkeit 1 1.For cleaning exhaust air that contains xylenes up to Κόπο
Concentrations of 250 mg / m were exposed, two test systems were used in parallel. The test conditions were constant for both systems: air flow rate 300 l / h, washing liquid 1 l.

In einer der Anlagen erfolgte die Abluftreinigung nach
dem Verfahren, wie es in DE-AS 25 47 675 beschrieben ist. Es konnte eine mittlere Auswaschleistung von 20% erzielt werden. Die Parallelanlage, deren Waschmedium zusätzlich suspendierte Aktivkohle (2 g/l) enthielt, erbrachte Auswaschleistungen, die im Mittel bei k5% lagen.
20The exhaust air was subsequently cleaned in one of the systems
the method as described in DE-AS 25 47 675. An average washout rate of 20% could be achieved. The parallel system, the washing medium of which also contained suspended activated charcoal (2 g / l), achieved washing out rates that averaged k5% .
20th

Claims (4)

Daimler-Benz Aktiengesellschaft Daitn 13 78l/4 Stuttgart EPT Dr Am/pfa 0 28.6.1982 Pat ent ansprüch e 10Daimler-Benz Aktiengesellschaft Daitn 13 78l / 4 Stuttgart EPT Dr Am / pfa 0 June 28, 1982 Patents claims 10 1. Verfahren zur Naßreinigung von verunreinigter Abluft mit -m Kreislauf geführtem Waschwasser, wobei der Waschprozeß mit die Verunreinigungen absorbierendem Waschwasser durchgeführt wird und das Waschwasser auf biologischem Wege regeneriert und anschließend zum Waschen wiederverwendet wird, dadurch gekennzeichnet, daß man ein suspendierte Aktivkohle enthaltendes Waschwasser verwendet. 1. A method for wet cleaning of contaminated exhaust air with -m circuit-led washing water, wherein the washing process is carried out with the impurities absorbing washing water and the washing water is regenerated biologically and then reused for washing, characterized in that a suspended activated carbon containing washing water is used . 2. Verfahren nach Anspruch 1,2. The method according to claim 1, da.durch gekennzeichnet,characterized, daß das Waschwasser 2 . bis 4 kg Aktivkohle pro that the washing water 2. up to 4 kg of activated carbon per vor before suspendiert enthält.contains suspended. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die suspendierte Aktivkohle eine Korngröße von höchstens 0,045 nun besitzt. 3. The method according to claim 1 or 2, characterized in that the suspended activated carbon now has a grain size of at most 0.045. 4. Verfahren nach den Ansprüchen 1 bis 3» dadurch gekennzeichnet, daß die suspendierte Aktivkohle eine Oberfläche nach BET von 4. Process according to claims 1 to 3 »characterized in that the suspended activated carbon has a BET surface area of 2
mindestens 900 m pro Gramm besitzt.2
has at least 900 m per gram. - 2- 2 - COPY J- COPY J
DE3224350A 1982-06-30 1982-06-30 Process for wet purification of contaminated exhaust air Withdrawn DE3224350A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE3224350A DE3224350A1 (en) 1982-06-30 1982-06-30 Process for wet purification of contaminated exhaust air

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3224350A DE3224350A1 (en) 1982-06-30 1982-06-30 Process for wet purification of contaminated exhaust air

Publications (1)

Publication Number Publication Date
DE3224350A1 true DE3224350A1 (en) 1984-01-05

Family

ID=6167189

Family Applications (1)

Application Number Title Priority Date Filing Date
DE3224350A Withdrawn DE3224350A1 (en) 1982-06-30 1982-06-30 Process for wet purification of contaminated exhaust air

Country Status (1)

Country Link
DE (1) DE3224350A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0357960A1 (en) * 1988-09-09 1990-03-14 Reinhard Dipl.-Ing. Glass Process and device for purifying waste gases by washing with a suspension of adsorbents
EP0377811A2 (en) * 1989-01-12 1990-07-18 Reinhard Dipl.-Ing. Glass Process and apparatus for cleaning exhaust gases
EP0490202A1 (en) * 1990-12-14 1992-06-17 MAN Gutehoffnungshütte Aktiengesellschaft Activated carbon filter for separating noxious gases, such as dioxins and furans, from flue gases before entering the chimney
WO1992019364A1 (en) * 1991-05-07 1992-11-12 Lab S.A. Method of cleaning gases containing condensable organic pollutants
US6843835B2 (en) 2001-03-27 2005-01-18 The Procter & Gamble Company Air cleaning apparatus and method for cleaning air

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE838592C (en) * 1940-07-20 1952-05-12 Aktivkohle Union Verwaltungs G Process for the purification of exhaust air containing hydrogen sulphide
DE2839173A1 (en) * 1977-09-15 1979-03-29 Sterling Drug Inc METHOD OF CLEANING UP AN ODOR-EMITING GAS

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE838592C (en) * 1940-07-20 1952-05-12 Aktivkohle Union Verwaltungs G Process for the purification of exhaust air containing hydrogen sulphide
DE2839173A1 (en) * 1977-09-15 1979-03-29 Sterling Drug Inc METHOD OF CLEANING UP AN ODOR-EMITING GAS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
McGuire, Michael J. - Suffet, I.H.: Activated carbon adsorption of organics from the aqueous phase, Vol. 2, 1981, Section II, S. 273-302 = Lit. (1) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0357960A1 (en) * 1988-09-09 1990-03-14 Reinhard Dipl.-Ing. Glass Process and device for purifying waste gases by washing with a suspension of adsorbents
EP0377811A2 (en) * 1989-01-12 1990-07-18 Reinhard Dipl.-Ing. Glass Process and apparatus for cleaning exhaust gases
EP0377811A3 (en) * 1989-01-12 1990-10-24 Reinhard Dipl.-Ing. Glass Process and apparatus for cleaning exhaust gases
EP0490202A1 (en) * 1990-12-14 1992-06-17 MAN Gutehoffnungshütte Aktiengesellschaft Activated carbon filter for separating noxious gases, such as dioxins and furans, from flue gases before entering the chimney
WO1992019364A1 (en) * 1991-05-07 1992-11-12 Lab S.A. Method of cleaning gases containing condensable organic pollutants
FR2676180A1 (en) * 1991-05-07 1992-11-13 Lab Sa PROCESS FOR PURIFYING FUMES CONTAINING CONDENSABLE ORGANIC POLLUTANTS.
US5567402A (en) * 1991-05-07 1996-10-22 Vicard; Jean-Fran+525 Ois Method of cleaning gases containing organic pollutants
US6843835B2 (en) 2001-03-27 2005-01-18 The Procter & Gamble Company Air cleaning apparatus and method for cleaning air
US7147692B2 (en) 2001-03-27 2006-12-12 The Procter & Gamble Company Air cleaning apparatus and method for cleaning air

Similar Documents

Publication Publication Date Title
DE2218180B2 (en)
DE3242819A1 (en) WASTEWATER TREATMENT METHOD FOR REDUCING THE REMAINING METAL CONCENTRATION IN HEAVY METAL COMPLEX CONTAINERS
DE3641442C2 (en) Exhaust air purification process
DE3224350A1 (en) Process for wet purification of contaminated exhaust air
DE2242702A1 (en) GAS PURIFICATION PROCESS
DE2323312C3 (en) Method and device for processing absorber material loaded during the treatment of liquids
DE3520474A1 (en) Process for removing from water and recovering undissolved organic substances and any dissolved organic substances present
DE2335213C3 (en) Process for the treatment of industrial wastewater by means of a cation exchanger
DE102012214065A1 (en) Method of removing mercury from flue gas in a wet scrubber
DE3744544C2 (en)
DE2411828A1 (en) PROCESS FOR ADSORING FOREIGN MATERIALS CONTAINED IN AN Aqueous LIQUID ON GRAINY ACTIVATED CARBON
DE2813125C2 (en) Process for removing sulfur oxides from exhaust gas containing oxygen
DE19523007C2 (en) Process for cleaning bulk goods, in particular river and harbor sediments and soil
EP0005262A2 (en) Process for separating mercury from aqueous solutions
CH682639A5 (en) Fine purification of water and treatment of condensates in an ion exchange unit.
DE3424064C2 (en)
DE590170C (en) Process for cleaning drinking water of all kinds, especially those waters that contain iron, manganese and aggressive carbonic acid
DE3731920A1 (en) Process for removing heavy metal traces from waste waters by absorption to chemically modified charcoal
DE1919663C3 (en) Process for the purification of dilute aqueous urea solutions contaminated with oily substances
DE3839144A1 (en) METHOD FOR TREATING OIL-BASED WATERS
DE10158899A1 (en) Removal of (in)organic pollutants from waste water comprises passing the water through a deep horizontal bed of a low-ash, high-porosity filter aid in the form of inert polydisperse particles
DD244327A1 (en) PROCESS FOR CLEANING CLEANED WASTE WATER
DE2308629A1 (en) METHOD FOR PURIFYING WASTE WATER
DE1517656A1 (en) Process for cleaning waste water from oil-containing, hydrophobic impurities
DE3733081A1 (en) Process for the biological purification of waste water

Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8130 Withdrawal