Define DO,BOD, Threshold limit value,COD

DO, BOD, Threshold Limit Value, COD:

• Dissolved Oxygen (DO) is the amount of oxygen that is dissolved in water.
• Biochemical Oxygen Demand (BOD) is a measure of the amount of oxygen consumed by microorganisms that decompose organic matter in water.
• Threshold Limit Value (TLV) is the maximum concentration of a pollutant that a person can be exposed to without suffering harm.
• Chemical Oxygen Demand (COD) is a measure of the amount of oxygen needed to oxidize all organic and inorganic substances in water.