Energy analysis of wastewater treatment plant in paper and paperboard mill

Water is one of the most important raw materials used in the production of paper and cardboard. For this reason, the production of paper and cardboard is always a process in which high amounts of water should be used. Water contaminates during this operations. For this reason, water used in paper and cardboard production should be treated. This study; It was carried out in a treatment plant located in a factory that produces cardboard in various weights. The treatment plant operates 24 hours with an installed capacity of 4020 m³/day. The aim is; to compare and interpret energy consumption by using the data of this facility. The wastewater treatment plant consists of physical and biological treatment units and the active sludge system has the capacity to handle 4000 kg BOD/day, 4020 m³/day hydraulic load. In this study, energy consumed during the treatment process; electrical, manual, mechanical and chemical energy as kWh/m³. The initial data were collected through field monitoring and supported by interviews with facility operators and recorded data (entering-exiting wastewater values, laboratory analyzes, consumables and chemical consumptions) for the research period. The field monitoring was carried out for 6 months in the 2017- 2018 period. As a result energy; Electrical, mechanical, manual and chemical energy are calculated separately. Total energy expenditure was found to be 1,9587 kWh/m³. It has been concluded that electrical energy has a share of 80,60% and chemical energy 18,05%.