Int. J. Environment and Waste Management, Vol. x, No. x, xxxx 1 Copyright © 200x Inderscience Enterprises Ltd. Biohydrogen production by anaerobic co-digestion of press mud and domestic sewage B. Radjaram Mechanical Engineering Division Manakula Vinayagar Institute of Technology Pondicherry -605107, India E-mail: radjaram@sify.com R. Saravanane* Environmental Engineering Laboratory, Department of Civil Engineering, Pondicherry Engineering College, Puducherry – 605 014, India Fax: 91-413-2655101 E-mail: rsaravanane@pec.edu E-mail: saravananae@gmail.com *Corresponding author Abstract: Anaerobic fermentation of press mud and sewage for biohydrogen production was conducted in six batch reactors for various total solid concentrations between 5 – 8.5%. Chemical oxygen demand, pH, total solid % for biohydrogen produced were monitored regularly. The experiments were conducted for 40 days to optimize the total solid content of the feed for maximum biohydrogen production. Effect of fermentation with and without seed was assessed. Viability of biohydrogen production from press mud as renewable energy to supplement energy crisis was explored. Keywords: press mud; sewage; biohydrogen; COD; chemical oxygen demand; anaerobic digestion; pH; batch. Reference to this paper should be made as follows: Radjaram, B. and Saravanane, R. (xxxx) ‘Biohydrogen production by anaerobic co-digestion of press mud and domestic sewage’, Int. J. Environment and Waste Management, Vol. x, No. x, pp.xxx–xxx. Biographical notes: B. Radjaram is currently Professor in Mechanical Engg & Head, Manakula Vinayagar Institute of Technology, Pondicherry. He received his B.E in Mechanical Engg in 1989 from University of Madras, M.Tech. in Energy Technology in 1997 and Ph.D in 2011 from Pondicherry Engineering College under Pondicherry University. His research interest is in energy and environment. He has about 20 years of experience in teaching, research & industry R. Saravanane received his PhD in Environmental Engineering from IIT, Chennai in 2003, ME in Environmental Engineering (Distinction) from Anna University, Chennai in 1993 and BE in Civil Engineering (Distinction) from University of Madras, Chennai in 1989. His research areas of interest include environmental engineering, biological fluidisation for wastewater treatment,