Decentralized wastewater treatment systems in large settlements

Abstract

Up to the considering of wastewater treatment, compared to the size of settlements, we can select a process type of wastewater treatment. Group of large settlements include settlements with over 20 000 inhabitants. Many of them are not covered by the centralized systems of water treatment, so the wastewater treatment of these settlements uses a special type of waste water processing. This paper provides an overview of this process through the pre-treatment, primary, secondary and tertiary treatment, with special attention to each of these procedures. Today, these ways of wastewater treatment are dominant in world practice.