Nature of toxic effects caused by sewage from pulp and paper industry on aquatic ecosystems

摘要

The toxicity of sewage from pulp and paper mills was analyzed. It was demonstrated that bioassay methods can detect the most environmentally hazardous steps of the manufacturing cycle of these mills and evaluate the efficiency of wastewater treatment processes. It was found that reducing substances play a key role in the formation of the toxic properties of wastewater; presumably, these are the uncontrollable water-soluble compounds of reduced sulfur, which effectively interact with hydrogen peroxide; they are resistant to oxidation by oxygen and cannot be entrapped by sewage treatment facilities.