Copyright © IFAC Automatic Systems for BUilding the Infrastructure in Developing Countries, Istanbul, Republic of Turkey, 2003 ELSEVIER IFAC PUBUCATIONS www.elsevier.comIJocalelifac AUTOMATIC SCADA SYSTEMS FOR RELIABLE MONITORING AND CONTROL OF KAYSERI WASTEWATER TREATMENT PLANT M. Cakmakd, I. See, O. OZdemir 3 , C. Kinaci 4 I Istanbul Technical University, Faculty of Civil Engineering Environmental Engineering Department 34469 Maslak-Istanbul, Republic of Turkey E-mail: mehmetcakmakci@hotmail.com;cakmakcim@itu.edu.tr 2Istanbul Water and Sewer Administration (ISKI) General Directorate Aksaray-Istanbul, Republic of Turkey E-mail: ilkersel@hotmail.com J Kayseri Water & Sewerage Administration General Directorate Kayseri, Republic of Turkey E-mail.·ozgurozd@yahoo.com 4jstanbul Technical University, Faculty of Civil Engineering Environmental Engineering Department 34469 Maslak-Istanbul, Republic of Turkey E-mail: ckinaci@srv.ins.itu.edu.tr r Abstract: An automatic control and estimation strategy for wastewater treatment plants, particularly for Kayseri WWTP, will be introduced in this study. The main idea in this study is to develop and evaluate a control mechanism which can be applied practically to improve and protect the performance of the mentioned treatment plant. It has also been discussed for a proper solution for the reliability of the Kayseri WWTP. At this point, on-line automatic control systems seems as an effective method for this aim. Parameters that will be measured are as follows: flow rate, chemical oxygen demand (COD), conductivity, pH, suspended solids (SS) and toxicity. A damage will prevent the plant from operating for days or weeks. With such a system, shock loadings coming to WWTP will be monitored by the automatic control system. Highly polluted wastewater or shock loadings will be collected in a storage tank and then fed to the treatment plant at an optimal time. Copyright © 2003 IFAC Keywords: Wastewater, wastewater treatment plant, trunk sewer, automatic control system 1. INTRODUCTION Wastewater collection systems are designed and operated without taking into consideration the hydraulic or mass loadings received by the WWTPs or the total effects of combined sewer overflows on the recipient environment. On the other hand, WWTP operators have traditionally been complacent and accept without questioning whatever comes down from the pipe or whenever it comes (Hemebring, et. aI., 2002). Wastewater treatment plants often operate at very low loading conditions for most of the 155 operational period. Besides the well known effect on sludge settleability, low loading conditions have also been related to the biological phosphorus removal process failure (Luccarini, et. aI., 2002). Along with the development of automatic instruments and computers, various types of automatic control technology for wastewater treatment have been developed. Many studies have reported significant improvements on the effluent quality and the reduction of operating costs due to the application of automatic control (Lee, et. aI., 1998).