Treatment of Industrial Wastewater Mar20

Treatment of Industrial Wastewater...

Treatment of Industrial Wastewater Water is used in the industry for process needs, for cooling, for steam generation, for dust suppression and many other uses. Industrial wastewater is the aqueous discard that results after the water is used for the above purposes. Industrial wastewater is the result of substances other than water having being dissolved or suspended in water. Treatment of industrial wastewater covers the mechanisms and processes used to treat waters that have been contaminated in some way or other due to use of the water in the above activities. The objective of treatment is to remove the dissolved and suspended substances of the wastewater so that treated water can be safely discharged into the environment or can be recycled back in the same process or can be used in a different process. Constituents of wastewater Industrial wastewater contains the following constituents that need proper treatment. Suspended solids – These are the contaminants that are visible to the naked eye and can generally be filtered out of the water using common filter paper. Although there is no hard and fast definition, suspended solids tend to be larger than 1 – 2 microns in size. If the water is left to stand without disturbing it, the suspended solids will settle to the bottom of the container over time. Dissolved solids – These are contaminants that are not visible to the naked eye and cannot be removed from the water by filtration. The dissolved solids are defined as the materials that are generally smaller than 0.45 microns in size. The dissolved solids are either normally soluble substances or inversely soluble substances. The normally soluble substances are those materials that become more soluble with increasing temperature. The inversely soluble substances normally referred to as ‘hardness’ ions and...