Effluent Treatment Plant is a process design for treating the industrial waste water for its reuse or safe disposal to the environment. An ETP is therefore designed to remove the physical chemical and biological materials present in the effluent. Depending on the level of treatment the waste water requires, an ETP is divided into 4 different levels each designed to remove a certain type of material in the effluent.

It is used for the removal of high amount of organic compounds, debris, dirt, pollution toxic, non-toxic materials and polymers etc. From Industrial effluent. CaO (Calcium Oxide or Lime), MgO (Magnesium oxide), Ca(OH)² (Calcium Hydroxide), or Mg(OH)² ( Magnesium Hydroxide) are the most commonly used chemicals become availability low cost and high capacity.