River Pollution: Causes and effects

acid activity algae amount animals appear associated authorities bacteria become biological carbon cause cent changes Chapter chemical chlorine coho salmon compounds concentration considerable considered containing detergents developed discharge disposal dissolved oxygen effect effluents example experiments factors fauna Figure fish flow give given growth half-life Health hydrogen important increased industrial iron lead less limits London materials methods MICHIGAN nature nitrate normal occur organic matter organic pollution oxidation period plants pollution populations present processes produced Public Purif radioactive reactions reduced reference relation removed Report requirements river pollution river water salts sewage sewage effluents showed shown similar sludge sodium solids solution species stations stickleback stream substances sulphide supply surface suspended synthetic Table temperature tion tolerant toxic trade treatment trout usually wastes zone