Abstract
Abstract Experimental investigation of nitrogen compound (nitrates and ammonium ions) removal from water using natural zeolite was carried out in the laboratory of Water Management Department in VGTU. Shallow‐well water samples were taken from a few place situated in Vilnius city and Vilnius district, nitrate concentration was enhanced adding Na NO3 into the samples. Nitrate removal from water solutions was carried out under static conditions: solutions with nitrate concentration of 74–288 mg/l were mixed during one hour with 5 g of 0.315 mm particle‐sized zeolite in an automatic mixer when mixing intensity was 100 min.−1; after 30 min. sedimentation nitrate concentration was measured in all the samples. Ammonium ion removal from water solutions (made of shallow‐well and tap water with NH4Cl) was carried out under static and dynamic conditions (water solutions with 10–15 mg/l of ammonium ion concentration were filtered through 0.315–0.63 mm particle‐sized filter medium). Experimental results show that sha...
Highlights
Nowadays approximately one third of Lithuania’s population uses water sources from shallow wells where the water quality has become a crucial issue
This work shows the pollution of shallow-well water according to nitrates and organic matter, and to a lesser degree other substances (Rutkovienė et al 2001; Aškinis, Strusevičius 1997; Klimas 2005; Juodkazis, Kučingis 1999)
An artificially-polluted with NaNO3 solution, shallow wells water was enriched by nitrate concentration
Summary
Nowadays approximately one third of Lithuania’s population (usually in rural areas) uses water sources from shallow wells where the water quality has become a crucial issue. The Public Health Center data show that during 1986–1989 more than 40 % of analysed shallow wells were polluted by nitrates and microorganisms. During 1991–1996 LR Health Protection Ministry Survey provided research data show that near 50 % of samples are inadequate to requirements. Following existing data approximately half million of people in Lithuania use water with inadequate hygiene norm requirement quality (HN 24:2003). The biggest part of polluted shallow wells is in the Eastern–Eastern/Southern part of Lithuania (Giedraitienė, Juodkazis 1999; Mičiudienė et al 1995)
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