Levapor / Biological processes

  • Biological processes with suspended and/or immobilised special organisms
  • Anaerobic pre- and after-treatment of effluent with minimal generation of sludge. High-performance nitrification and denitrification - with suspended and robust carrier-bound organisms, - for the main stream or partial streams.
  • Biofiltration of effluent as after treatment, via adsorbing, porous carrier surfaces to achieve higher stability of nitrification, removal of residual COD, hazardous and suspended substances.
  • Biological waste-gas treatment – for "lightening speed” treatment of contaminated gas emissions from treatment plants, composting plants and warehouses for waste in compact trickle bed reactors with LEVAPOR for the protection of staff and local residents.

 

Biological waste-gas treatment – for "lightening speed” treatment of polluted waste-gas emissions from treatment plants, composting plants and waste warehouses compact trickle-bed reactors with LEVAPOR for the protection of staff and local residents.

Among our successful, tried and tested “special tools" are

  • Highly active special organisms (biocatalysts - patented), adapted to tackle the specific problem which operate far more efficiently and quickly than conventional biosludges.
  • Porous, absorbing LEVAPOR carriers for the IMMOBILISATION of special organisms.
  • Many years’ experience in the development and optimisation of bioprocesses

Our innovative, compact and cost-effective solutions can be configured for the

  • Improvement and expansion of existing plants and · Construction of new plants.
 

Levapor - Carriers

 

LEVAPOR: adsorbing, porous carriers for the immobilisation of biomass

 

The biological treatment of some types of effluent, particularly from industry, can often be problematical, because

  • The biodegradation of contaminants is the result of ”microbial team work“ by special organisms, whereby
  • Such “specialists” tend not to form fast settling flakes, which
  • Often leads to their being washed out of the reactor, which
  • Substantially diminishes the degradation performance and stability of the bioprocess

An efficient retention of organisms in the bioreactor avoids such undesirable effects. Among the most efficient methods for the maintenance and improvement of the reactor performance is e.g. the IMMOBILISATION of the BIOMASS.

  • This involves the “retention” of microbial cells on firm surfaces, together with the formation of biofilms.
  • This leads to an increase in
    • the degradation performance and process stability, through
    • enhanced stability of the organisms despite the impact of fluctuating temperatures, pH-values and inhibitors, as well as
    • Lower sludge production. The success of the IMMOBILISATION of microorganisms essentially depends upon the characteristics of the so-called carrier material.

 

“Ideal” Carrier Properties Responsible for
1. Rapid wettability Homogenous medium
2. Effective water-binding Maintenance of bioactivity
3. Fast colonisation Immediate application
4. Binding of inhibitors Avoidance of degradation inhibitors
5. Internal porosity Enhanced protection of the biofilm
6. Good mass transfer Higher reaction velocity
7. Good fluidisation properties Lower energy consumption,
  higher mass transfer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

All these requirements are met by LEVAPOR, - An adsorbing (contains up to 50 wt.% activated carbon) and - porous carrier material, a synthetic foam coated with activated carbon

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Fig 1. LEVAPOR, porous, adsorbing carrier material (REM photo)
 

The advantage of deploying LEVAPOR lies in its ideal characteristics, which ensure that

  • The surfaces of the carrier material are colonised by the key microorganisms within one of two hours,
  • Enabling them to better resist adverse external influences,
  • The degradation-inhibiting substances are bound and rendered harmless,
  • Bioprocesses attain their maximum efficiency more rapidly and can remain stable.
 

Areas of application

 

The biological treatment of

  • Municipal effluent,
  • Industrial effluent and
  • Contaminated groundwater (in fluidised bed reactors, Fig. 2), as well as contaminated soils and
  • Waste gases

with carrier-bound microorganisms.

 

The carrier is also deployed – among other applications – in the following biological degradation processes: for example, in the case of:

  • Nitrification
  • Poorly degradable substances
  • Inhibitory pollutants
  • Unfavourable sludge properties

LEVAPOR can be applied in

  • Fluidised bed reactors, with 10 to 15 vol.% loading
  • Fixed bed, as well as “expanded bed“ - reactors with 20 to 70 vol.% loading
 

Technical data of LEVAPOR

 

Form: Cuboids Würfel
Standard dimensions (mm ): 14x14x7 bis
20x22x8
14 x 14 x 14
Block density (kg/m³): ca.50 75 - 100
Bulk weight (kg/m³) ca. 20 40 - 50
Material density (g/cm³ ) 1,04-1,1 -
Loading 10-15 vol. % > 50 %
Ideal reactor type Fluidised bed Fixed bed
Excess sludge removal Aeration sufficient Aeration
     
Settling velocity   -
a) Without biomass colonisation, 
W50 (m/h)
ca. 50 -
b) With biomass colonisation, 
W50 (m/h)
ca. 70 -
     
 
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Cultivated special cultures for biodegradation

 

The biodegradation of pollutants, which among other things, also contains substituted organic compounds, takes place - analogously with chemical synthesis - in several stages and involves the “cooperation” of several different types of microorganisms (mixed culture). At the same time, each strain is responsible for the conversion of specific molecules and substitutes. The absence of key strains can leads to only partial degradation or even to an interruption in the degradation process, particularly when degradation products are created during such a multistage reaction, which can inhibit the other strains. If the strains responsible for the individual degradation stages and their properties are known, it is possible to deliberately create, cultivate and to feed either continually or in batches, into the bioreactor a defined mixed culture for the biodegradation of a specific compound and its derivatives.

 

This method is based on the

  • Cultivation and permanent availability of
  • Mixed cultures, containing important, and
  • known organisms in the microbial, flocculent sludge or bioreactor.

Using this process, “problematic” chemicals and products were successfully degraded in various technical and pilot plants designed by us.

 
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Fig. 4: Treatment plant with the cultivation and feeding of microorganisms.