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HUBER Active Carbon Filter CONTIFLOW® GAK Quaternary treatment for the removal of micropollutants

  • Simple process for the removal of trace substances (fourth treatment stage)
  • No shutdowns necessary for cleaning
  • Reuse of the activated carbon

Especially municipal sewage plant effluents are among the most critical paths of entry for micropollutants into surface waters. Many of these so-called trace substances are hazardous to the environment and health, are not readily biodegradable and can accumulate in the environment.

With the HUBER Active Carbon Filter CONTIFLOW® GAK, HUBER has developed a versatile and reliable key component for the removal of trace substances (fourth treatment stage), which, cleverly combined with the HUBER Pile Cloth Media Filter Rotafilt® or the HUBER Sandfilter CONTIFLOW®, represents an ideally matched process solution.

However, also in industrial wastewater treatment, the HUBER activated carbon filter CONTIFLOW® GAK finds a steadily growing field of application. Especially when it comes to removing dissolved organic COD compounds and pollutants to meet stricter discharge criteria, adsorptive treatment stages with the HUBER Active Carbon Filter CONTIFLOW® GAK are the technology of choice.

HUBER Active Carbon Filter CONTIFLOW® GAK
HUBER Active Carbon Filter CONTIFLOW® GAK
HUBER Active Carbon Filter CONTIFLOW® GAK
HUBER Active Carbon Filter CONTIFLOW® GAK
HUBER Active Carbon Filter CONTIFLOW® GAK (tank design)
HUBER Active Carbon Filter CONTIFLOW® GAK (tank design)
Design sketch/Variant 1: Combination of ozonisation with subsequent activated carbon filtration (GAK), upstream cloth filtration (police filter) and downstream UV disinfection
Design sketch/Variant 1: Combination of ozonisation with subsequent activated carbon filtration (GAC), upstream cloth filtration (police filter) and downstream UV disinfection
Design sketch/Variant 2: Flocculation filtration for phosphorus elimination with subsequent activated carbon filtration (GAK) and downstream UV disinfection
Design sketch/Variant 2: Flocculation filtration for phosphorus elimination with subsequent activated carbon filtration (GAK) and downstream UV disinfection
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Design sketch: HUBER Active Carbon Filter CONTIFLOW® GAK
Design sketch: HUBER Active Carbon Filter CONTIFLOW® GAK

Design and Function

Design sketch: HUBER Active Carbon Filter CONTIFLOW® GAK
Design sketch: HUBER Active Carbon Filter CONTIFLOW® GAK

The HUBER Active Carbon Filter CONTIFLOW® GAK is an upflow active carbon adsorber with granulated activated carbon (GAC) as filling. It has a modular design and is available as a stainless steel tank or optionally as concrete construction.

The HUBER Active Carbon Filter CONTIFLOW® GAK is designed for continuous operation. This means that no feed interruptions are necessary for cleaning the activated carbon.

As the inflow slowly streams through the activated carbon bed from bottom to top, dissolved organic particles such as trace substances are adsorbed on the large inner surface of the activated carbon. The purified water flows off via a weir in the upper part of the filter.

As the pressure loss increases, the activated carbon is gently conveyed from the bottom of the hopper into the scrubber located at the top, where it is cleaned from particulate residues. The particles are separated with a small partial flow, the so-called wash water.

The activated carbon, which has been cleaned of solids but is still partially loaded with micropollutants, then falls back down onto the filter bed, creating an internal activated carbon circuit. As operation progresses, the loading on the internal surface of the carbon slowly increases.

Applications

  • Adsorption of trace substances in advanced wastewater treatment (fourth treatment stage)
  • Biological secondary filtration for the removal of trace substances following ozonisation (BAC filtration)
  • Removal of dissolved COD compounds in industrial wastewater treatment (process wastewater, recirculation water)

The benefits of the HUBER Active Carbon Filter CONTIFLOW® GAK

  • Easy to retrofit on existing sewage treatment plants due to modular design
  • No complex carbon dosing technology as with PAC processes
  • No dirt and dust loads as with PAC processes
  • No precautions for explosion protection as with PAC processes
  • No secondary filtration required as with PAC processes
  • No shutdowns necessary for cleaning the activated carbon bed
  • Activated carbon can be regenerated and largely reused

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Customer Information and Documents

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Case Studies

HUBER Solutions in Operation

img-casestudy-23-10-4th-treatment-stage-uhldingen-01
2023-09-04 Uhldingen-Mühlhofen, Germany

Germany’s largest combined method for the removal of trace substances: fourth treatment stage in operation in Uhldingen-Mühlhofen

In August 2023, after more than two years of construction, one of the most cutting-edge systems for the removal of trace...

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img-casestudy-22-11-4reinigungsstufe-update-02-bickenbach
2022-11-29 Bickenbach and Uhldingen, Germany

Fourth treatment stage lighthouse projects: micropollutant removal plants Bickenbach and Uhldingen progressing rapidly

How can a fourth treatment stage be optimally integrated or retrofitted, taking into account all individual requirements...

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img-casestudy-22-05-seefelden-24gak-01
2022-05-19 Seefelden, Germany
img-casestudy-22-02-bickenbach-spurenstoffe
2022-02-10 Bickenbach, Germany

Bickenbach Wastewater Treatment Plant: HUBER supplies technologies for Hesse’s first plant for elimination of trace substances

The Bickenbach Wastewater treatment plant (WWTP) will be the first WWTP in Hesse (Germany) to receive advanced...

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img-casestudy-21-07-stufe4-01-gak-filtration
2021-07-01 Berching, Germany

HUBER offers convincing key components for a tailor-made 4th treatment stage

In recent years, hardly any other topic has been discussed more intensively than the introduction of the 4th treatment...

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img-casestudy-17-09-contiflow-spurenstoff-01
2017-09-23 Ingelheim, Germany

Research project: removal of micropollutants with the use of ozone and granulated active carbon

Boehringer Ingelheim Pharma confirmed HUBER Active Carbon Filter CONTIFLOW® GAC  increased efficiency for the...

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