Trihalomethane occurrence in ...
Published by Syeda Aniqa Gul, worked in Non Govt organization - Coordinating officer (Hygiene Promotion & office administration)
Trihalomethane occurrence in chlorinated reclaimed water at full-scale wastewater treatment plants in NE Spain
~~Abstract
courtesy: Water Research
Volume 41, Issue 15, August 2007, Pages 3337–3344
Total trihalomethane (TTHM) concentrations were determined in three chlorinated effluents (i.e. secondary and tertiary) from full-scale wastewater treatment plants (WWTP) in NE Spain over a 2-year monitoring period (May 2003–February 2005). Low TTHM concentrations View the MathML source(2–30μgL-1), according to international standards for drinking water View the MathML source(80–150μgL-1), were obtained in all samples analysed. The effects of (a) ammonia nitrogen and bromide concentrations, (b) UV light exposure, (c) tank storage, and (d) water temperature were evaluated. Two chlorination strategies were adopted: low chlorine dosages View the MathML source(2–5mgCl2L-1) and a high-chlorine dosage View the MathML source(16mgCl2L-1). The effects of storing chlorinated reclaimed water and of UV light exposure before chlorination were also evaluated. Samples collected over the 2-year monitoring period offered the possibility to assess the numerous variables affecting THM formation. A statistical evaluation of Platja d’Aro WWTP data set shows a low TTHM formation in the presence of high ammonia nitrogen concentration (p