H2S generation in a reclaimed urban wastewater pipe. Case study: Tenerife (Spain)

The present work is part of an experimental study carried out in a complete ly filled gravity pipe, 61 km long, which transports reclaimed urban wastew ater (RUWW), for crop irrigation with an average water residence time of 42 h, in the island of Tenerife (Spain). Field studies were conducted from No vember 1994 to June 1995. H2S generation has been observed in the pipe when anaerobic conditions appear. A direct relation between sulfide generation and the organic matter measured as COD has been seen. S(II) build-up in thi s pipe is compared with the predicted S(II) according to equations proposed by Boon and Lister (1975), Hvitved-Jacobsen er al. (1988) and Boon (1995) for sewers [Boon, A. G. and Lister, A. R. (1975) Formation of sulphide in r ising main sewers and its prevention by injection of oxygen. Prog. Water, T echnol. 7(2), 289-300; Hvitved-Jacobsen, T., Juette, P. H., Nielsen, P. H. and Jensen, N.Aa. (1988) Hydrogen sulphide control in municipal sewers. In Pretreat. in Chem. Wat. and Wast. Treat., Proceedings of rite 3rd Internati onal Gothenburg Symposium, eds. H. H. Hahn and R. Klute, pp. 239-247. Sprin ger Verlag, Gothenburg, Sweden; Boon, A. G. (1995) Septicity in sewers: cau ses, consequences and containment. Water Sci. Technol. 31(7), 237-253.]. Ch anges in oxidation-reduction potential (ORP) during transportation are pres ented and an empirical equation which relates S(II) concentration in wastew ater with the oxidation-reduction potential (ORP) and sulfate has been deve loped. (C) 1998 Elsevier Science Ltd. All rights reserved.