Kemira Oyj/Kemira M&I ABSTRACT Vesa Kettunen ... - Svenskt Vatten

Abstract for:
13 th Nordic Wastewater Conference
To be considered in all categories
Title:
Laboratory and field investigation of Chemical disinfection of sewer overflow in
Copenhagen Area
Authors:
Henrik R. Andersen, DTU Miljø, hran@env.dtu.dk
Anitha K. Sharma , DTU Miljø
Ravi K. Chhetri , DTU Miljø
Jesper Berner, KEMIRA
Robin Gramstad KEMIRA
Öjstedt Ulrik KEMIRA
Dines Thornberg, Udviklingssamarbejdet.
Kasper Juel-Berg , HOFOR
Annette Kolte-Olsen , Nordvand
Jean De Dieu Otoa , Greve-Solrød forsyning
Abstract
Combined Sewer Overflow (CSO) has been a problem in every large city with old sewers resulting in
deterioration of water quality of receiving waters around the city. . With the anticipated increased rain
intensity due to climate change and increased loads on sewer system due to urbanisation the problem is
expected to be magnified in the future. Copenhagen has many beaches and several public baths in the old
harbour and to maintain the high water quality for bathing it is necessary to reduce the microbial pollution
from the CSOs.
Disinfection of CSOs reduces the load of microorganisms and the most common methods are UV-light or
addition of different forms of chlorine. However, UV-disinfection of CSOs is not attractive due to high
capital cost and non-predictive occurrence of CSOs. Disinfection with chlorine forms toxic by-products. In
recent years, laboratory and full scale investigation of novel organoperoxide disinfectants, peracetic
acid(PAA) and performic acid(PFA) have shown that these chemicals can be attractive disinfectants. We
presents results from laboratory and field investigations on disinfection of CSOs using PFA and PAA.
The laboratory part of the study aims to produce the relevant information in order to find the most suitable
chemical disinfections agents for CSOs in different contexts: Concentration profiles, disinfection efficiency,
byproducts and residual toxicity is investigated. Additionally a literature study is performed to describe the
costs and handling of each chemical. The project, “DesiCSO”, partly funded by Vand-i-Byer and will be
finished in March 2013.
The field investigations will be performed at 3 different sites with the aim to investigate whether it is
possible to obtain bathing water shortly after heavy rainstorms in full-scale. The project named FRODO,