will anybody tell me the exact procedure of formation of Trihalomethanes (THMs) by chlorination of water or in wastewater?

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3 Answers

  1. 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

  3. Trihalomethane

    When chlorine is added to water with organic material, such as algae, river weeds, and decaying leaves, THMs are formed. Residual chlorine molecules react with this harmless organic material to form a group of chlorinated chemical compounds, THMs. They are tasteless and odorless, but harmful and potentially toxic. The quantity of byproducts formed is determined by several factors, such as the amount and type of organic material present in water, temperature, pH, chlorine dosage, contact time available for chlorine, and bromide concentration in the water. The organic matter in water mainly consists
    of a) humic substance, which is the organic portion of soil that remains after prolonged
    microbial decomposition formed by the decay of leaves, wood, and other vegetable matter; and  fulvic acid, which is a water soluble substance of low molecular weight that is derived from humus. hope this works or tell me what exactly u are looking for, i may be of some help..cheers