Investigation of energy costs for sludge management: a case study from dairy industry

Year 2021, , 277 - 283, 30.09.2021

Pelin Yapıcıoğlu , Mehmet İrfan Yeşilnacar

https://doi.org/10.35208/ert.862116

Abstract

Sludge management has been regarded as an environmental challenge to deal with due to high energy costs for wastewater treatment plants. From this perspective, energy costs of sludge management should be defined and calculated in order to obtain an effective energy management in wastewater treatment plants. Energy consumption of sludge management is the major constituent of the operational costs. Especially, dewatering processes have led to high electricity consumption at industrial wastewater treatment plants. This paper aimed to define the role of design and operational parameters on energy costs of sludge treatment process in terms of total organic carbon (TOC) and sludge volume index (SVI) considering water-energy nexus. Dissolved Air Flotation (DAF) sludge and centrifuge decanter were used for sludge dewatering process in a dairy wastewater treatment plant. Lime is used for sludge stabilization. Energy cost index has been figured out using a new derived numerical method. This study proposed a new developed methodology for energy cost assessment of sludge management. This paper revealed that energy costs would be lower if the wastewater treatment plant was operated under design conditions. If the plant was operated at design conditions, nearly 63% of reduction on energy costs of sludge handling process could be ensured. It has been recommended this plant could be operated under design conditions.

Keywords

DAF, Energy costs, Sludge, SVI, TOC

References

• [1]. L Falletti, L. Conte, A. Zaggia, T. Battistini and D. Garosi, “Food industry wastewater treatment plant based on flotation and MBBR,” Modern Environment Science and Engineering, vol. 1, pp. 562-566, 2014.
• [2]. M.S. Pereira, A.C. Borges, F.F Heleno., L.F.A. Squillace and L.R.D., “Faroni Treatment of synthetic milk industry wastewater using batch dissolved air flotation,” Journal of Cleaner Production, vol. 189, pp. 729-737, 2018.
• [3]. J. Behin and S. Bahrami, “Modeling an industrial dissolved air flotation tank used for separating oil from wastewater,” Chemical Engineering and Processing, vol. 59, pp. 1– 8, 2012.
• [4]. P. Yapıcıoğlu and Ö. Demir, “Life cycle assessment of sewage sludge treatment - an overview,” Harran University Journal of Engineering, vol. 2, pp. 78-92, 2017.
• [5]. A. Filibeli, Arıtma çamurlarının işlenmesi, Dokuz Eylül Üniversitesi Mühendislik Fakültesi Yayınları, 255, 6.Baskı,İzmir, 2009.
• [6]. Metcalf & Eddy, Inc., Wastewater Engineering: Treatment and Resource Recovery, 5th ed., McGraw-Hill International Editions, Newyork, 2014.
• [7]. Y. Liu, " Chemically reduced excess sludge production in the activated sludge process," Chemosphere, vol. 50, pp. 1–7, 2003.
• [8]. E Egemen, J. Corpening, N. Nirmalakhandan, "Evaluation of an ozonation system for reduced waste sludge generation," Water Science & Technology, vol. 44 (2–3), pp. 445–452, 2001.
• [9]. G. Erden., The Investigation of Sludge Disintegration Using Oxidation Process, Phd Thesis, Dokuz Eylül University Graduate School of Natural and Applied Sciences, İzmir, 2010.
• [10]. O. Landa-Cansigno, K. Behzadian, D.I. Davila-Cano, L.C. Campos, “Performance assessment of water reuse strategies using integrated framework of urban water metabolism and water-energy-pollution nexus,” Environmental Science and Pollution Research, vol. 27, pp. 4582–4597, 2020.
• [11]. S. Wang, T. Cao, B. Chen, “Urban energy–water nexus based on modified input–output analysis,” Applied Energy, vol. 196, pp. 208–217, 2017.
• [12]. P. Yapıcıoğlu. “Energy cost assessment of an industrial wastewater treatment plant: effect of design flow,” Academic Perspective Procedia, vol. 2(3), pp.532-537, 2019.
• [13]. L. Castellet-Viciano, D. Torregrossa, F. Hernández-Sancho, “The relevance of the design characteristics to the optimal operation of wastewater treatment plants: Energy cost assessment,” Journal of Environmental Management, vol. 222, pp. 275–283,2018.
• [14]. E Uggetti., I. Ferrer,, J. Molist and J. García, “Technical, economic and environmental assessment of sludge treatment wetlands,” Water Research, vol. 45(2), pp. 573-582, 2011.
• [15]. S. Nielsen, “Economic assessment of sludge handling and environmental impact of sludge treatment in a reed bed system,” Water Science and Technology, vol. 71(9), pp. 1286-1292, 2015.
• [16]. S. Sid, A. Volant, G. Lesage and M. Heran, “Cost minimization in a full-scale conventional wastewater treatment plant: associated costs of biological energy consumption versus sludge production,” Water Science and Technology, vol. 76(9), pp. 2473-2481, 2017.
• [17]. APHA. Standard Methods for the Examination of Water and Wastewater (20th ed.). New York: American Public Health Association, 1998.
• [18]. F. Hernandez-Sancho, M. Molinos-Senante, R. Sala-Garrido, “Cost modelling for wastewater treatment processes,” Desalination, vol. 268, pp. 1–5, 2011a.
• [19]. (2020) The MENR website. [Online]. Available: https://www.enerji.gov.tr/tr-TR/Anasayfa.
• [20]. F. Hernández-Sancho, M. Molinos-Senante, R. Sala-Garrido, “Energy efficiency in Spanish wastewater treatment plants: a non-radial DEA approach,” Science of Total Environment, vol. 409, pp. 2693–2699, 2011b.
• [21]. M. Molinos-Senante, F. Hernandez-Sancho, R.Sala-Garrido, “Cost modeling for sludge and waste management from wastewater treatment plants: an empirical approach for Spain,” Desalination and Water Treatment, vol. 51, pp. 5414–5420, 2013.
• [22]. M.H. Plumlee, B.D. Stanford, J Debroux., D.C. Hopkins, S.A. Snyder, “Costs of advanced treatment in water reclamation,” Ozone Science and Engineering, vol. 36, pp. 485–495, 2014.
• [23]. W. Yumin, W. Lei, F. Yanhong, “Cost function for treating wastewater in rural regions,” Desalination and Water Treatment, vol. 57, pp. 17241–17246, 2016.
• [24]. U. Ushani, S. Kavitha, R.Y. Kannah, M. Gunasekaran, G. Kumar, , D. D. Nguyen and J. R. Banu, “Sodium thiosulphate induced immobilized bacterial disintegration of sludge: An energy efficient and cost effective platform for sludge management and biomethanation,” Bioresource technology, vol. 260, pp. 273-282, 2018.
• [25]. P. Yapıcıoğlu and M. I. Yeşilnacar,, “Energy cost assessment of a dairy industry wastewater treatment plant.,” Environmental Monitoring and Assessment, vol. 192(8), pp. 1-17, 2020.