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Using Oxidation–Reduction Potential as Septicity Control Parameter During Reclaimed Wastewater Transportation
Author(s) -
DelgadoDíaz Sebastián,
Álvarez Manuel,
RodríguezGómez Luis E.,
Aguiar Escolástico
Publication year - 2000
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143000x137996
Subject(s) - anoxic waters , anaerobic exercise , wastewater , environmental science , environmental engineering , hydraulic retention time , anaerobic respiration , chemical oxygen demand , sewage treatment , environmental chemistry , chemistry , biology , physiology
During wastewater transportation, chemical and biological transformations may occur. Aerobic, anoxic, and anaerobic conditions exist depending on the presence or absence of dissolved oxygen and oxidized nitrogen compounds. The occurrence of anaerobic conditions has a negative effect on wastewater transportation because of the usual subsequent sulfide generation process. In Tenerife, Spain, reclaimed wastewater used for agricultural purposes is transported via a completely filled gravity pipe, 0.6 m in diameter and 61 km long. Because of the long residence time (approximately 30 to 40 hours), anaerobic conditions typically occur after 5 to 10 hours of flow. Field studies during transportation were conducted from November 1994 to July 1997. This paper describes a study of the evolution of septic conditions (aerobic, anoxic, and anaerobic) and the relationship between septicity and oxidation–reduction potential (ORP), which can predict the occurrence of anaerobic conditions.