GB2067092A - Process for maintaining the biological activity and adaptation of the biocoenosis of a biological waste-air wet-purification unit - Google Patents

Process for maintaining the biological activity and adaptation of the biocoenosis of a biological waste-air wet-purification unit Download PDF

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Publication number
GB2067092A
GB2067092A GB8100145A GB8100145A GB2067092A GB 2067092 A GB2067092 A GB 2067092A GB 8100145 A GB8100145 A GB 8100145A GB 8100145 A GB8100145 A GB 8100145A GB 2067092 A GB2067092 A GB 2067092A
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United Kingdom
Prior art keywords
biocoenosis
preliminary washing
biological
waste
air
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Granted
Application number
GB8100145A
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GB2067092B (en
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Daimler Benz AG
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Daimler Benz AG
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Publication of GB2067092A publication Critical patent/GB2067092A/en
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Publication of GB2067092B publication Critical patent/GB2067092B/en
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/04—Aerobic processes using trickle filters
    • 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
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Microbiology (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Molecular Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)

Abstract

In a process for maintaining, during standstill periods, the biological activity and adaptation of the biocoenosis of a biological wet purification unit used to degrade by biological oxidation harmful substances absorbed by washing water in the purification of waste air by washing, the waste air is subjected to preliminary washing and the resultant preliminary washing liquid enriched with materials contained in the air is supplied to the biocoenosis during standstill periods. Dust particles may be separated from the liquid before it is supplied to the biocoenosis. Other nutrients may additionally be supplied to the biocoenosis as well as the said liquid.

Description

SPECIFICATION Process for maintaining the biological activity and adaptation of the biocoenosis of a biological wetpurification unit The purification of waste air by washing with water, for example in scrubbers or spray towers, and subjecting harmful substances absorbed to degradation by biological oxidation is generally known and often employed. The dissolved or colloidal organic cbmpounds obtained, and in some cases also inorganic compounds, are utilised as a source of nutrients by the micro-organisms (bacteria, fungi, Protozoa) present on the scrubber packing or in the effluent, and are oxidised (see United Kingdom Patent Specification 1,544,072, German Offenlegungschriften 2,547,675 and 2,020,207, U.S. Patent Specification 2,200,581, French Specification 2,175,929 and Dutch Specification 7,102,133).
It is known that the microorganism population (biocoenosis) in such a purification unit adapts itself to the nutrients presented, so that, after a certain adaptation period, even compounds which are difficultto degrade can be successfully degraded.
During standstill periods of the purification unit, for example overnight or at the weekend, the biocoenosis must be kept artificially alive by supplying nutrients and oxygen. It is therefore advantageous if the nutrient solution also contains substances which are to be degraded during the operating periods of the unit in order to avoid any deadaptation phenomena in the biocoenosis which could lead to a reduction in the efficiency of the biological degradation (see, for example, German Offenlegungsschrift 2,656,689, page 15, and German Offenlegungsschrift 2,020,207, page 4). However, it is difficult to prepare such nutrient solutions because the nature and concentration of the waste-air composition is, on the one hand, often unknown and, on the other hand, is subject to continuous variations arising from minor or major production changes.
The nutrient solution would therfore generally likewise require to have a continuously changing composition, which may prove impracticable.
The present invention therefore seeks to provide a process for maintaining the biological activity and adaptation of a bicoenosis during standstill periods of a purification unit for waste air by supplying a nutrient solution whose composition always sub stantially corresponds to the actual state of the waste gas composition.
According to the invention, in a process for main tdining the biological activity and adaptation of the biocoenosis of a biological waste-air wet purification unit during standstill periods by supplying a nutrient solution, the waste air is subjected to preliminary washing and the resultant preliminary washing liquid enriched with the materials contained in the air is supplied to the biocoenosis during standstill periods.
If a biological wet purification unit for waste air is preceded by a preliminary washing with water, gaseous and vapourous contents of the waste air are dissolved in the wash water of the preliminary washing stage until this water becomes saturated. The rate at which saturation is achieved differs, depending on the substances contained in the waste air and their concentration. However, it usually takes only a few hours. The preliminary washing may be effected in a manner which is known per se, for example by passing the gases through a spray tower or scrubber in which the preliminary washing liquid is pumpcirculated or by bubbling the gases through the preliminary washing liquid. The preliminary washing may take place in a separate part of the unit, or may be integrated in the absorber of the biological stage.
Suitably, the amount of preliminary washing liquid is made such that the amount of waste-air contents dissolved therein is sufficient to support the biocoenosis during the standstill periods. However, it is possible to supply in addition other nutrients, known per se, to the biocoenosis, such as sugar, milk powder, phosphates and the like, these nutrients advantageously being supplied together with the preliminary washing liquid. In this case, the contents of the waste air are no longerthe sole source of nutrients, but serve only to suppress any deadaptation phenomena of the biocoenosis. The amount of preliminary washing liquid in the preliminary washing stage can then be kept at a lower level.
If the waste air also contains dust, in addition to highly odorous gaseous or vaporous contents, a dust-removal step may be included in the preliminary washing stage. The dust-removal step frequently necessary before entry of the waste air into the purification unit may then be dispensed with. As a result of the preliminary washing stage, the waste air entering the purification unit is at the same time saturated with water vapour. Precipitation of lime and the build-up of salt in the washing water can be kept away from the biological purification stage. In the case of high dust contents in the waste air, mechanical, and in some cases also chemical, preclarification (settling, flocculation) of the preliminary washing water from the preliminary washing stage may be necessary before this water is used as nutrient solution.If larger amounts of washing liquid are obtained in the preliminary washing stage than can be degraded during the standstill periods of the main washing stage, the excess of preliminary washing liquid can also be passed into the main washing stage and degraded there during its operation.
Contents of harmful substances, in the waste air, varying widely during operation are largely compensated for by desorption and absorption processes in the preliminary washing stage, which means that peak loads for the biological system can be intercepted. A more uniform loading of the biological stage, with improved efficiency, can thereby be achieved.
1. A process for maintaining the biological activity and adaptation of the biocoenosis of a biological waste-air wet purification unit during standstill periods by supplying a nutrient solution, wherein the waste air is subjected to preliminary washing and the resultant preliminary washing liquid enriched with the materials contained in the air is supplied to the biocoenosis during standstill periods.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Process for maintaining the biological activity and adaptation of the biocoenosis of a biological wetpurification unit The purification of waste air by washing with water, for example in scrubbers or spray towers, and subjecting harmful substances absorbed to degradation by biological oxidation is generally known and often employed. The dissolved or colloidal organic cbmpounds obtained, and in some cases also inorganic compounds, are utilised as a source of nutrients by the micro-organisms (bacteria, fungi, Protozoa) present on the scrubber packing or in the effluent, and are oxidised (see United Kingdom Patent Specification 1,544,072, German Offenlegungschriften 2,547,675 and 2,020,207, U.S. Patent Specification 2,200,581, French Specification 2,175,929 and Dutch Specification 7,102,133). It is known that the microorganism population (biocoenosis) in such a purification unit adapts itself to the nutrients presented, so that, after a certain adaptation period, even compounds which are difficultto degrade can be successfully degraded. During standstill periods of the purification unit, for example overnight or at the weekend, the biocoenosis must be kept artificially alive by supplying nutrients and oxygen. It is therefore advantageous if the nutrient solution also contains substances which are to be degraded during the operating periods of the unit in order to avoid any deadaptation phenomena in the biocoenosis which could lead to a reduction in the efficiency of the biological degradation (see, for example, German Offenlegungsschrift 2,656,689, page 15, and German Offenlegungsschrift 2,020,207, page 4). However, it is difficult to prepare such nutrient solutions because the nature and concentration of the waste-air composition is, on the one hand, often unknown and, on the other hand, is subject to continuous variations arising from minor or major production changes. The nutrient solution would therfore generally likewise require to have a continuously changing composition, which may prove impracticable. The present invention therefore seeks to provide a process for maintaining the biological activity and adaptation of a bicoenosis during standstill periods of a purification unit for waste air by supplying a nutrient solution whose composition always sub stantially corresponds to the actual state of the waste gas composition. According to the invention, in a process for main tdining the biological activity and adaptation of the biocoenosis of a biological waste-air wet purification unit during standstill periods by supplying a nutrient solution, the waste air is subjected to preliminary washing and the resultant preliminary washing liquid enriched with the materials contained in the air is supplied to the biocoenosis during standstill periods. If a biological wet purification unit for waste air is preceded by a preliminary washing with water, gaseous and vapourous contents of the waste air are dissolved in the wash water of the preliminary washing stage until this water becomes saturated. The rate at which saturation is achieved differs, depending on the substances contained in the waste air and their concentration. However, it usually takes only a few hours. The preliminary washing may be effected in a manner which is known per se, for example by passing the gases through a spray tower or scrubber in which the preliminary washing liquid is pumpcirculated or by bubbling the gases through the preliminary washing liquid. The preliminary washing may take place in a separate part of the unit, or may be integrated in the absorber of the biological stage. Suitably, the amount of preliminary washing liquid is made such that the amount of waste-air contents dissolved therein is sufficient to support the biocoenosis during the standstill periods. However, it is possible to supply in addition other nutrients, known per se, to the biocoenosis, such as sugar, milk powder, phosphates and the like, these nutrients advantageously being supplied together with the preliminary washing liquid. In this case, the contents of the waste air are no longerthe sole source of nutrients, but serve only to suppress any deadaptation phenomena of the biocoenosis. The amount of preliminary washing liquid in the preliminary washing stage can then be kept at a lower level. If the waste air also contains dust, in addition to highly odorous gaseous or vaporous contents, a dust-removal step may be included in the preliminary washing stage. The dust-removal step frequently necessary before entry of the waste air into the purification unit may then be dispensed with. As a result of the preliminary washing stage, the waste air entering the purification unit is at the same time saturated with water vapour. Precipitation of lime and the build-up of salt in the washing water can be kept away from the biological purification stage. In the case of high dust contents in the waste air, mechanical, and in some cases also chemical, preclarification (settling, flocculation) of the preliminary washing water from the preliminary washing stage may be necessary before this water is used as nutrient solution.If larger amounts of washing liquid are obtained in the preliminary washing stage than can be degraded during the standstill periods of the main washing stage, the excess of preliminary washing liquid can also be passed into the main washing stage and degraded there during its operation. Contents of harmful substances, in the waste air, varying widely during operation are largely compensated for by desorption and absorption processes in the preliminary washing stage, which means that peak loads for the biological system can be intercepted. A more uniform loading of the biological stage, with improved efficiency, can thereby be achieved. CLAIMS
1. A process for maintaining the biological activity and adaptation of the biocoenosis of a biological waste-air wet purification unit during standstill periods by supplying a nutrient solution, wherein the waste air is subjected to preliminary washing and the resultant preliminary washing liquid enriched with the materials contained in the air is supplied to the biocoenosis during standstill periods.
2. A process according to Claim 1, wherein the preliminary washing liquid is supplied to the biocoenosis after separation of dispersed dust particles from the liquid.
3. A process according to Claim 1 or 2, wherein the preliminary washing liquid is supplied to the biocoenosis after the addition of per so known nut rients to the said liquid.
4. A process for maintaining the biological activity and adaptation of the biocoenosis of a biological waste-air wet purification unit during standstill periods according to Claim 1 and substantially as hereinbefore described.
GB8100145A 1980-01-10 1981-01-05 Process for maintaining the biological activity and adaptation of the biocoenosis of a biological waste-air wet-purification unit Expired GB2067092B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3000705A DE3000705C2 (en) 1980-01-10 1980-01-10 Process for maintaining the biological activity and adapting the biocenosis of a biological waste air wet cleaning system during downtimes

Publications (2)

Publication Number Publication Date
GB2067092A true GB2067092A (en) 1981-07-22
GB2067092B GB2067092B (en) 1983-06-02

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GB8100145A Expired GB2067092B (en) 1980-01-10 1981-01-05 Process for maintaining the biological activity and adaptation of the biocoenosis of a biological waste-air wet-purification unit

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BE (1) BE886868A (en)
DE (1) DE3000705C2 (en)
FR (1) FR2473548B1 (en)
GB (1) GB2067092B (en)
NL (1) NL8100031A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274986A1 (en) * 1986-12-05 1988-07-20 Ciba-Geigy Ag Waste gas purification process
EP0447862A1 (en) * 1990-03-21 1991-09-25 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Method for the biological purification of gases which are contaminated with halogenated ethenes and/or with halogenated butadienes
US5064763A (en) * 1988-04-07 1991-11-12 Ciba-Geigy Corporation Biological process for purifying waste air

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2200581A (en) * 1934-12-24 1940-05-14 Pruss Max Purification of gases by biological means
DE2020207B2 (en) * 1970-04-25 1976-07-08 Wieferig, Theodor, Dipl.-Ing., 2848 Vechta METHOD AND DEVICE FOR CLEANING ROOM EXHAUST AIR, PREFERABLY STABILITY EXHAUST
DE2547675B2 (en) * 1975-10-24 1978-06-01 Daimler-Benz Ag, 7000 Stuttgart Process for the wet cleaning of polluted exhaust air
DE2656689C2 (en) * 1976-12-15 1982-11-04 Daimler-Benz Ag, 7000 Stuttgart Process for the wet cleaning of exhaust air containing organic carbon compounds with biological liquid regeneration

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274986A1 (en) * 1986-12-05 1988-07-20 Ciba-Geigy Ag Waste gas purification process
US5082475A (en) * 1986-12-05 1992-01-21 Ciba-Geigy Corporation Waste air purification process
US5064763A (en) * 1988-04-07 1991-11-12 Ciba-Geigy Corporation Biological process for purifying waste air
EP0447862A1 (en) * 1990-03-21 1991-09-25 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Method for the biological purification of gases which are contaminated with halogenated ethenes and/or with halogenated butadienes

Also Published As

Publication number Publication date
DE3000705C2 (en) 1982-07-22
DE3000705A1 (en) 1981-07-16
GB2067092B (en) 1983-06-02
FR2473548A1 (en) 1981-07-17
BE886868A (en) 1981-04-16
FR2473548B1 (en) 1985-07-12
NL8100031A (en) 1981-08-03

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Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee