Viorel Patroescu, Cosmin Jinescu, Cristiana Cosma, Ionut Cristea, Valeriu Badescu, Claudia Simona Stefan<br>Influence of Ammonium Ions on the Treatment Process Selection of Groundwater Supplies Intended to Human Consumption

Viorel Patroescu, Cosmin Jinescu, Cristiana Cosma, Ionut Cristea, Valeriu Badescu, Claudia Simona Stefan
Influence of Ammonium Ions on the Treatment Process Selection of Groundwater Supplies Intended to Human Consumption

Abstract:

In Romania, drinking water is produced from surface water (60%) and groundwater (40%). The presence of inorganic compounds containing oxidizable nitrogen within groundwater sources (NH4+-N, NO2--N) at variable concentration levels in association with other pollutants/micropollutants from natural/anthropogenic origin asks for previous treatability studies before the setting-up of final treatment technology. The ones currently applied for NH4+-N oxidation involve use of chlorine for oxidation of specific pollutants (N-NH4+, S2- a.s.o.) and water disinfection. The high doses of chlorine required by NH4+-N “break point” chlorination process (Cl2: NH4+-N weight ratio = 7.6÷15:1) are able to generate undesirable chlorinated by-products from which trihalomethanes are the only regulated for drinking water (MACTHM = 100 mg/L). The experimental results of treatability studies using chlorine as oxidant reagent for three groundwater sources located in Bucharest proximity containing among oxidizable pollutants: NH4+-N (³1 mg/L), natural organic matter (DOC £ 3.5 mg/L), Mn(II) ions are presented. The noncompliance aspects related to the quality of treated water (THMs concentration, residual chlorine, free and bound chlorine ratio a.s.o.) from groundwater sources containing high concentration NH4+-N impose replacement of classic treatment process based on chlorine chemical oxidation with other process (biological nitrification). Keywords: groundwater, ammonium ions, natural organic matter (NOM), break point chlorination, chlorinated by-products

Issue: 2015, Volume 66, Issue 4

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This article is published under the Creative Commons Attribution 4.0 International License

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