Selecting informative indicators while performing ecological risk evaluation around the functioning water purification plant
Results are presented of the physico-chemical and biological investigation of the waste water. A hydrobiological eval uation is performed of the condition of the Protva river, into which cleared drains are dumped. Criteria are formulated for ecological risk evaluation and a conclusion is made about the likely toxic influence of certain predominant pollutants (nickel, zinc and copper ions) on the river aquifer.