Journal of Water and Wastewater; Ab va Fazilab (in persian)

Journal of Water and Wastewater; Ab va Fazilab (in persian)

Process Optimization of Khoy Wastewater Treatment Plant Aerated Lagoons in Cold Climate Conditions

Document Type : Technical Note

Authors
Yousof Rahimi 1
Amir Hosein Mahvi 2
Ali reza Mesdaghinia 3
1 Faculty of Public Health, Orumieh University of Medical Sciences
2 Associate Professor, School of Public Health, Center for Environmental Research, Tehran University of Medical Sciences
3 Professor, School of Public Health, Center for Environmental Research, Tehran University of Medical Sciences
Abstract
The efficiency of Khoy WWTP located in the cold region in northwest of Iran has been studied from April 2002 to April 2004. The efficiency of WWTP in different seasons has been compared. It was found that facultative aerated lagoons efficiency in warm months was favorable but in cold months the level of pollutants was higher than discharge standards. In order to optimize the existing process, a model which takes into account the variability of air temperature and flow-rate at three types of aerated lagoons: facultative, aerobic and dual-powered has been developed to simulate the performance of various alternatives of aerated lagoons. Results show that both aerobic and dual-powered aerated lagoons can produce the effluent with higher quality than facultative aerated lagoons. Since the dual-powered process costs less and is more compatible with the existing lagoons, this process is proposed for upgrading the existing system to enhance its effluent quality and also WWTP's capacity.
Keywords
Facultative Aerated Lagoons
Temperature
optimization
Dual- powered
1- EPA. (1973). Upgrading lagoons, US Environmental Protection Agency, Technology Transfer, EPA-625/4-73-007b, 1-5.
2- EPA. (1983). Municipal wastewater stabilization ponds, desing manual, US Environmental Protection Agency Office of Research and Development, Cincinnati OH, EPA-625/1-83-015, 16-17, 104-105.
3- APHA, AWWA, WEF. (1992). Standard methods for the examination of water & wastewater, 18th Ed., American Public Health, Washington DC.
4- Metcalf & Eddy, Inc. (2003). Wastewater engineering treatment & reuse, 4th Ed.,
McGraw-Hill, New York.
5- Arcievala, S.J. (1998). Wastewater treatment for pollution control, 2nd Ed., Tata, McGraw-Hill Publishing Company Limited, New Dehli.
Journal of Water and Wastewater; Ab va Fazilab (in persian)
Volume 17, Issue 2 - Serial Number 2
Serial number: 58
May and June 2006
Pages 70-77