After the coking wastewater was treated with the new activated
carbon, the amount of phenol and its derivatives was greatly
reduced, but phenols and hydrocarbons were still present at
relatively high levels. In addition, the pyridines, indoles, imidazolium
and ketone compounds dropped below the instrument
detection limit. At the same time, some new compounds, such
as esters, were produced in the system.adsorption nature of the activated carbon for polar compounds,
such as phenols