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Aromatic hydrocarbons (BTX) are very often found in municipal sewage in the range from 0 to 933 µg/dm3. The concentration of toluene in the digested sludge liquor from primary settling tanks could increase to 42 000 µg/dm3. Other aromatic hydrocarbons are observed in lower concentrations of about 30 µg/dm3. Aromatic hydrocarbons have a more or less negative effect on the treatment. The effects were...
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