Abstract
The specific pollution load per ton of fibre board at an Austrian factory is in the range of 110 kg COD or 50 kg BOD5. Aerobic treatment would result in unacceptable costs (energy, nutrients, sludge handling). Semitechnical pilot scale investigations showed that anaerobic treatment can lower the BOD5 to about 80 % and the COD to about 75 %. But it was not possible to maintain these efficiencies over longer periods (several months). Labscale experiments resulted in stable and very high removal efficiencies (94 % BOD5, 86 % COD). Reliable neutralization was shown to be necessary for good results.
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