Is it true that industrial effluents undergo several treatment processes before being released into the environment?

 Industrial effluents are typically much more polluted than domestic sewage, containing higher concentrations of toxic chemicals and heavy metals. 

industrial effluents typically undergo several treatment processes before being released into the environment to ensure that the wastewater meets environmental and health standards and does not harm the ecosystem. The specific treatment processes used will depend on the type and composition of the effluent and the desired end result. Treatment processes are applied to remove the pollutants, but they may not be able to remove all the pollutants.