22
Chemical Pretreatment of Sewage
a CostBenefit Method for Upgrading Existing and
Constructing New Wastewater Treatment Plants
I. Licsko, Z. Melicz, and A. Szabo
Department of Sanitary and Environmental Engineering, Budapest University of
Technology and Economics, Miiegyetem rkp. 3. UV Building, 1111 Budapest,
Hungary e-mail: licsko@vcst.bme.hu.melicz@vcst.bme.hu.anita@vcst.bme.hu.
Tel: +36-1-463-2142. Fax: +36-1-463-3753
Abstract
Different pollutant (organic matters and phosphorus) removal efficiencies of
chemical pretreatment were investigated in lab-scale experiments. The results
demonstrated that 55-80% of organic content and 85-95% of phosphorus removal
have been reached, while the residual organic matter concentration did not exceed
200 mgr 1 as CODer and 120 mgr 1 as BODs; furthermore the phosphorus content
decreased below 1.0 mgr 1 in the chemically treated sewage. The results of lab
experiments and calculations proved that the introduction of chemical
pretreatment provides appropriate quality and quantity (volume) improvement of
WWTP at low cost. The cost saving appears in the nitrification - initiated by
organic matter load reduction - in activated sludge processes, originally designed
as high load systems.
1 Introduction
In Hungary, near to 95% of the total population is connected to the drinking water
supply network systems operated by different waterworks. Although the drinking
water service in Hungary is close to the European Union level, there is a large gap
concerning sewerage and wastewater treatment. Approximately 55-58% of the
total population is connected to the existing sewerage systems (but 65-67% have
this possibility). Near to 50% of the collected sewage is discharged into a surface
recipient without appropriate treatment. The lack of sewage treatment plants
characterizes the sewerage systems that had been built before the 1990s and the
low level of connection to them, mainly to those established after the socialpolitical change.
H. Rubin / P. Nachtnebel / J. Fuerst / U. Shamir
Preserving the Quality of Our Water Resources
© Springer-Verlag Berlin Heidelberg 2002
Chemical Pretreatment of Sewage
a CostBenefit Method for Upgrading Existing and
Constructing New Wastewater Treatment Plants
I. Licsko, Z. Melicz, and A. Szabo
Department of Sanitary and Environmental Engineering, Budapest University of
Technology and Economics, Miiegyetem rkp. 3. UV Building, 1111 Budapest,
Hungary e-mail: licsko@vcst.bme.hu.melicz@vcst.bme.hu.anita@vcst.bme.hu.
Tel: +36-1-463-2142. Fax: +36-1-463-3753
Abstract
Different pollutant (organic matters and phosphorus) removal efficiencies of
chemical pretreatment were investigated in lab-scale experiments. The results
demonstrated that 55-80% of organic content and 85-95% of phosphorus removal
have been reached, while the residual organic matter concentration did not exceed
200 mgr 1 as CODer and 120 mgr 1 as BODs; furthermore the phosphorus content
decreased below 1.0 mgr 1 in the chemically treated sewage. The results of lab
experiments and calculations proved that the introduction of chemical
pretreatment provides appropriate quality and quantity (volume) improvement of
WWTP at low cost. The cost saving appears in the nitrification - initiated by
organic matter load reduction - in activated sludge processes, originally designed
as high load systems.
1 Introduction
In Hungary, near to 95% of the total population is connected to the drinking water
supply network systems operated by different waterworks. Although the drinking
water service in Hungary is close to the European Union level, there is a large gap
concerning sewerage and wastewater treatment. Approximately 55-58% of the
total population is connected to the existing sewerage systems (but 65-67% have
this possibility). Near to 50% of the collected sewage is discharged into a surface
recipient without appropriate treatment. The lack of sewage treatment plants
characterizes the sewerage systems that had been built before the 1990s and the
low level of connection to them, mainly to those established after the socialpolitical change.
H. Rubin / P. Nachtnebel / J. Fuerst / U. Shamir
Preserving the Quality of Our Water Resources
© Springer-Verlag Berlin Heidelberg 2002