Evaluation of Sewage Sludge for Incineration (Case study: Arak Wastewater Treatment Plant)

Document Type : Research Article


1 Water and Wastewater Company of Markazi Province, Arak, Iran

2 Water and Wastewater Research Centre, Water Research Institute (WRI), Ministry of Energy, Tehran, Iran

3 Assistant Professor, Environmental Engineering, Department of Civil Engineering, University of Arak, Arak, Iran


Sewage sludge treatment has become a primary subject in wastewater treatment and energy production. This paper aims to study the feasibility of power generation by incineration from sewage sludge enriched with impurities like heavy metals. For this purpose, we chose Arak wastewater treatment plant (AWWTP) and used calorific bomb test for examination. The experimental results showed that the heating values of sewage sludge are much less than the predicted records. This relates to the heavy metal and impurities content of sludge. These totally involved 5 to 18% of dried biomass. Therefore, we modified the predicting equation of heating value with respect to both water and impurities content of excess sludge. Finally, regarding the sludge characteristics of AWWTP, an annealing hierarchy programming (AHP) was used to find optimal technologies for dewatering and sludge minimization. Here, 21 criteria are classified in three main categories to rank the technologies regarding their costs, risks and performance. By all these means, a practical solution is introduced for optimal sludge management.


APHA (2005). Standard Methods for the Examination of Water and Wastewater, 24th Edition, American Public Health Association, Washington D.C.
ASTM D240 (2014). Standard Test Method for Heat of Combustion of Liquid Hydrocarbon Fuels by Bomb Calorimeter, ASTM International, West Conshohocken, PA, DOI: 10.1520/D0240-14
Azizi S., Valipour A., Jamshidi S. and Sithebe T. (2015). Performance evaluation of the electrolysis process for waste sludge stabilization in decentralization practices, Desalination and Water Treatment, 54(3), DOI: 10.1080/19443994.2014.886293
Christodoulou A. and Stamatelatou K. (2016). Overview of legislation on sewage sludge management in developed countries worldwide, Water Science & Technology, 73(3), 453-462.
Ducharme C. (2010), Technical and economic analysis of plasma assisted waste to energy processes, M.Sc Thesis, Columbia University, USA.
Feizi Ashtiani E., Jamshidi S., Niksokhan M.H. and Feizi Ashtiani A. (2015a), Value index, a novel decision making approach for waste load allocation, International Journal of Environmental, Chemical, Ecological, Geological and Geophysical Engineering, 9(6), 624-628.
Feizi Ashtiani E., Niksokhan M.H., Jamshidi S. (2015b), Equitable fund allocation, an economical approach for sustainable waste load allocation, Environmental Monitoring and Assessment, 187(8), 522.
Gezer Gorgec A., Insel G., Yagci N., Dogru M., Erdincler A., Sanin D., Filibeli A. and Keskinler B. (2016). Comparison of energy efficiencies for advanced anaerobic digestion, incineration, and gasification processes in municipal sludge management, Journal of Residuals Science & Technology, 13(1).
Gholikandi G.B., Jamshidi S. and Valipour A. (2013), Application of electrolysis upgrading the operation of anaerobic reactors, Journal of Environmental Studies, 38, 9-16 (in Persian).
Giorgio Bertanza G., Baroni P. and Canato M. (2016), Ranking sewage sludge management strategies by means of Decision Support Systems: A case study, Resources, Conservation and Recycling, 110, 1–15.
Gianico A., Bertanza G., Braguglia C.M., Canato M., Gallipoli A., Laera G., Levantesi C. and Mininni G. (2016), Enhanced Versus Conventional Sludge Anaerobic Processes: Performances and Techno-Economic Assessment, Water Environment Research, 88(5), 468-478(11).
Huan L., Yiying J., Bux Mahar R., Zhiyu W. and Yongfeng N. (2009), Effects of ultrasonic disintegration on sludge microbial activity and dewaterability, Journal of Hazardous Materials, 161, 1421-1426.
IRENA (2012), renewable energy technologies: cost analysis series, Biomass for Power Generation, Volume 1: Power Sector, Issue 1/5.
Jamshidi S., Ardestani M., Niksokhan M.H. (2016a), Upgrading Wastewater Treatment Plants Based on Reuse Demand, Technical and Environmental Policies (A Case Study), Environmental Energy and Economics International Research, 1, 101-112.
Jamshidi S., Ardestani M., Niksokhan M.H. (2016b), A seasonal waste load allocation policy in an integrated discharge permit and reclaimed water market, Water Policy, 18(1), 235-250.
Jamshidi S., Niksokhan M.H., Ardestani M. (2016c), Wastewater Reuse, an Opportunity to Expand Nitrogen Discharge Permit Markets, Journal of Environmental Studies (in Persian).
Jamshidi S., Niksokhan M.H. (2016), Multiple pollutant discharge permit markets, A challenge for wastewater treatment plants, Journal of Environmental Planning and Management, 59(8), 1438-1455.
Jamshidi S., Akbarzadeh A, Woo KS, Valipour A. (2014a), Wastewater treatment using integrated anaerobic baffled reactor and Bio-rack wetland planted with Phragmites sp. and Typha sp. Journal of Environmental Health Science & Engineering 12, 131-142.
Jamshidi S., Niksokhan M.H., Ardestani M. (2014b), Surface water quality management using integrated discharge permit and reclaimed water market, Water Science and Technology, 70(5), 917-924.
Kim D.J. and Lee J. (2012), Ultrasonic sludge disintegration for enhanced methane production in anaerobic digestion: effects of sludge hydrolysis efficiency and hydraulic retention time, Bioprocess Biosystems Engineering, 35, 289-296.
Mahmoud, A., Olivier, J., Vaxelaire, J., Hoadley, A.F.A., (2011), Electro-dewatering of wastewater sludge: Influence of the operating conditions and their interactions effects, Water Research, 45, 2795-2810.
Martins C.L., Velho V.F., Ramos S.R.A., Pires A.S.C.D., Duarte E.C.N.F.A. and Costa R.H.R. (2016), Valuation of OSA process and folic acid addition as excess sludge minimization alternatives applied in the activated sludge process, Water Science & Technology, 73(4), 734-739.
Milieu Ltd, (2010), Environmental, economic and social impacts of the use of sewage sludge on land, final report, Part III, Belgium.
Morrin P., Marcos B., Moresoli C. and Laflamme C.B. (2010), Economic and environmental assessment on the energetic valorization of organic material for a municipality in Quebec, Canada, Applied Energy 87, 275-283.
Murakami T., Suzuki Y., Nagasawa H., Yamamoto T., Koseki T., Hirose H. and Okamoto S. (2009), Combustion characteristics of sewage sludge in an incineration plant for energy recovery, Fuel processing technology, 90, 778-783.
Perez-Elvira S.I., Nieto Diez P. and Fdz-Polanco F. (2006), Sludge minimization technologies, reviews in environmental science and biotechnology, 5, 375-398.
Piao W., Kim Y., Kim H., Kim M. and Kin C., (2016), Life cycle assessment and economic efficiency analysis of integrated management of wastewater treatment plants, Journal of Cleaner Production, 113, 325-337.
Rai C.L. and Rao P.G. (2009), Influence of sludge disintegration by high pressure homogenizer on microbial growth in sewage sludge: an approach for excess sludge reduction, clean technology and environmental policy, 11, 437-446.
Snyman, H.G. and Herselman J.E. (2006), Guidelines for the utilization and disposal of wastewater sludge: Volume 5, Water Research Commission TT 262/06, Pretoria, South Africa.
Zhang Y., Zhang P., Ma B., Wu H., Zhang S. and Xu X. (2012), Sewage sludge disintegration by high pressure homogenization: a sludge disintegration model, Journal of Environmental Sciences, 24(5), 814-820.
Tyagi V.K. and Lo S.L. (2011), Application of physico-chemical pretreatment methods to enhance the sludge disintegration and subsequent aerobic digestion: an up to date review, reviews in environmental science and biotechnology, 10, 215-242.
USEPA, (2011), 40 CFR part 60, Standards of performance for new stationary sources and emission guidelines for existing sources: Sewage sludge incineration units, final rule.
Yuan H.P., Yan X.F., Yang C.F. and Zhu N.W. (2011), Enhancement of waste activated sludge dewaterability by electro-chemical pretreatment, Journal of Hazardous Materials, 187, 82-88.