Wastewater is any water that has been adversely affected in quality by anthropogenic influence. It comprises liquid waste discharged by domestic residences, commercial properties, industry, and/or agriculture and can encompass a wide range of potential contaminants and concentrations. Industrial site drainage (silt, sand, alkali, oil, chemical residues), industrial cooling waters, industrial process waters, organic or bio-degradable waste, including waste from abattoirs, creameries, and ice cream manufacture, organic or non bio-degradable/difficult-to-treat waste (pharmaceutical or pesticide manufacturing), extreme pH ranges (from acid/alkali manufacturing, metal plating), toxic waste (metal plating, cyanide production, pesticide manufacturing, etc.) solids and emulsions (paper manufacturing, foodstuffs, lubricating and hydraulic oil manufacturing, etc.), agricultural drainage, direct and diffuse.