Water pollution Crossword

Any physical or chemical change in water that adversely affect the health of humans and other organisms
wastewater from drains or sewers; includes human waste,soaps, etc.
The amount of oxygen needed by microorganisms to decompose biological wastes into carbon dioxide,water, and minerals
Overnourishment of an aquatic ecosystem by nutrients such as nitrates and phosphates; due to human activities such as agriculture and discharge from sewage treatment plants
Water quality test for the presence of fecal bacteria, which indicates a chance That pathogenic organisms may be present as well
Water pollution that can be traced to a specific origin
Pollutants that enter bodies of water over large areas rather than being concentrated a single point of entry
Treating wastewater by moving suspended and floating particles by mechanical processes
Treating wastewater biologically to decompose suspended Organic material
The solids remaining after sewage treatment has been completed
Advanced wastewater treatment methods that are sometimes employed after primary and secondary treatments
The upper limit for the concentration of a particular water pollutant in water intended for human consumption
The maximum permissible amount of a water pollutant that can be discharged from a sewage treatment plan, factory, or other point source