Anaerobic-aerobic treatment of toxic pulp effluents with biomass, immobilised on LEVAPOR carrier

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Courtesy of LEVAPOR GmbH, Biofilm Technologies

1. The problem

Effluents of pulp mills using chlorine for pulp bleaching do contain several, under aerobic conditions only weakly degradable (35-45%) toxic chloroorganic pollutants.

2. The solution

Preliminary biotretment tests under anaerobic conditions, using specially adapted microorganisms, immobilised on adsorbing, porous LEVAPOR carrier showed a remarkably increased degradation. Results obtained in continuous tests in pilot scale have confirmed the previous results and served as basis for conception and design of a full scale plant, comprising of microaerobic pre-treatment, anaerobic step and aerobic post-treatment.

Anaerobic-aerobic treatment of toxic pulp effluents with biomass, immobilised on LEVAPOR carrier
Anaerobic-aerobic treatment of toxic pulp effluents with biomass, immobilised on LEVAPOR carrier
3. The plant has been started 1990
Anaerobic-aerobic treatment of toxic pulp effluents with biomass, immobilised on LEVAPOR carrier
Anaerobic-aerobic treatment of toxic pulp effluents with biomass, immobilised on LEVAPOR carrier
Anaerobic-aerobic treatment of toxic pulp effluents with biomass, immobilised on LEVAPOR carrier

4. The effect of LEVAPOR

In order to confirm the contribution and efficiency of LEVAPOR, initially only two of three anaerobic reactors had been filled with LEVAPOR, the third one had been started with suspended anaerobic sludge. The activity of suspended biomass has never reached the activity and removal rates of immobilised biomass and crashed down after a toxic shock in May 90(Fig 5), followed by filling with LEVAPOR and by a new startup.

Anaerobic-aerobic treatment of toxic pulp effluents with biomass, immobilised on LEVAPOR carrier

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