ECONOMICS

Detailed explanation-1: -There are three main stages of the wastewater treatment process, aptly known as primary, secondary and tertiary water treatment. In some applications, more advanced treatment is required, known as quaternary water treatment.

Detailed explanation-2: -Which of the following waste water treatment plant may or may not need the screens? Explanation: Industrial waste water treatment plants may or may not need the screens. Screens must be provided even for industrial waste water treatment plants to separate labels, stopper, cardboard, and other packing materials.

Detailed explanation-3: -(a) Pumping. Pumping facilities may be employed to gain sufficient head for the wastewater to flow through the treatment works to the point of final disposal. Pumping is also generally required for recirculation of all or part of the flow around certain units within the plant.