waste management treatment online classes

Sedimentation tank is used for removal of suspended solids and some organic matters.Some common technique applied for primary treatment of sewage are:.The main objective of primary treatment is to reduce strength of sewage by removing suspended materials.After removal of gross solids, grits and fats, next step in treatment is removal of remaining suspended solids as much as possible.In this method, sewage is placed in skimming tank and it is aerated from bottom so that fats and oils are collected at top of the liquid which are then removed by skimming.Skimming is the process of removal of fatty and oily material from sewage.Grits are removed by carefully regulating the flow velocity of sewage in grit removal tank.Grits are small, non-biodegradable particles which are heavier than suspended organic matters.The removes gross solids are disposed by burning or composting.For this purpose waste water is passed through a metal screen which consists of vertical or inclined steel bars usually set 5 cm apart.

Screening is used to remove gross solid waste like plastics, cloths, dead animals from waste water.Some of the treatment technique applied for preliminary treatment purpose are.The main objective of preliminary treatment is to remove gross solids (such as plastics, cloths, cans, dead body of animals etc), grits and fats from waste water.To prevent public health from toxic effect of pollutant.Other purpose of waste water treatment includes.Biological treatment methods utilizes biological characteristics of pollutants such as bacteria, viruses by purification.Chemical treatment methods utilizes chemical characteristics of pollutant for purification.Physical treatment methods utilizes physical separation of pollutant such as by filtration etc.Treatment process are broadly classified as physical, chemical and biological treatments. Methods of waste water treatment depends on composition of waste water and required quality for treated water.The quality standard usually depends whether the water will be reused or discharged into river. The purpose of waste water treatment is to remove contaminant from water so that the treated water can meet the acceptable quality standard.

Waste management treatment online classes