M. Łój-Pilch, A. Zakrzewska, E. Zielewicz
Silesian University of Technology, Institute of Water and Wastewater Engineering, Gliwice, PL

RECOGNITION OF UNFAVOURABLE EVENTS THAT MAY POSE A RISK ON MUNICIPAL SEWAGE TREATMENT PLANT


Wastewater treatment plants are technical facilities designed to remove solids and dissolved solids, colloids and suspensions from wastewater before drainage them to the receiver. For this purpose, mechanical, biological and chemical processes are used. The mechanical section consists of the basic processes used to separate mineral solids and easily settleable organic solids, however the technology of the biological and chemical sections depends on quantity and quality of incoming sewage. Municipal sewage treatment plants can generally be divided into small treatment plants, in which the activated sludge or biological filters are used for the biological section, and large treatment plants, mainly based on the activated sludge processes. Moreover, depending on the type and amount of sewage, chemical sewage treatment can be used. Variety of applied processes at wastewater treatment plants causes the occurrence of unfavourable events that pose a risk to the primary purpose of a treatment plant. Identifying those events is the basis for the risk management process in a technical facility.

Keywords: risk identification, municipal sewage treatment plant, activated sludge