MODERN APPROACH TO MANAGEMENT OF COMBINED SEWER OWERFLOWS

Abstract

Combined  Sewer  Overflows  (CSOs),  which  are  build  on  combined  sewerage  network  to diminish amount of wastewater carried to wastewater treatment plant (WWTP), loud receiving waters with  considerable  amount  of  mixture  of  sewage  and  storm  water  and  pollution  which  they  carry. Receiving  waters  are  polluted  and  their  ecological  status  is  affected.  The  aim  of  stormwater management  in  the  combined  sewerage  network  during  rain  event  is  to  keep  CSOs  overflows  in sustainable limits. It is generally necessary to minimize the total emissions from CSOs and WWTP´s. The  paper  presents  basic  results of  a  critical  state-of-the-art  review  on  impacts  of  combined  sewer overflows on receiving waters. Paper also describes the potential of technologies for CSOs treatment.
Today  the  conventional  measures  for  reducing  CSO pollutant  load  are  well  known,  however  the stochastic behavior of  rainfall  and  the uncertainties  in  land  use development  as well  as the limited knowledge  on  efficiency  of  CSO  treatment  yield  the  most  difficult  conditions  for  design.  Therefore, special attention should be paid to efficiency and cost-effectiveness of applied measures. Paper bring the  integrated  view  of  present  knowledge  on  CSO  treatment  measures  especially  considering  the current demands outgoing from the implementation of EU Framework Directive (WFD).