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Type of publication: Straipsnis Clarivate Analytics Web of Science ar/ir Scopus / Article in Clarivate Analytics Web of Science or / and Scopus (S1)
Field of Science: Aplinkos inžinerija / Environmental engineering (T004)
Author(s): Gasiūnas, Valerijus;Strusevičius, Zenonas;Strusevičienė, Sigita Marija
Title: Pollutant removal by horizontal subsurface flow constructed wetlands in Lithuania
Is part of: Journal of environmental science and health part a-toxic/hazardous. Part A, Toxic/hazardous substances and environmental engineering. , Vol. 40, iss. 6-7 (2005)
Extent: p. 1467-1478
Date: 2005
Keywords: Waste-water treatment;Design;Denitrification;Nitrification;Performance;Systems
Abstract: Horizontal subsurface flow constructed wetlands recently have been developed in Lithuania. They ensure the efficient removal of nutrients and organic matter. This article analyses BOD5 and N and P removal efficiency with respect to filter loads. To achieve a normative wastewater treatment level according to BOD5 (25 mg O-2 l(-1)), loads of filters should not exceed 5.8 g m(-2) day(-1), that is, the treatment of wastewater produced by population equivalent requires a filter area of 10.5 m(2). After treatment in filters total N of wastewater contains 55-85% of mineral N. Nitrite-N and nitrate-N make up 0.1% and 3.0% on average; the other part is composed of ammonia-N. Increasing total N concentrations contained in water outflow predetermine higher ammonia-N amounts. If water outflow contains 10 mg l(-1) of total N, ammonia-N makes up 51.5%; if it contains 40 mg l(-1), then ammonia-N makes up 81.0%. The average total nitrogen removal efficiency is 37-44%. P removal is affected by the physico-chemical characteristics of sand and qualitative composition of phosphorus contained in wastewater. P removal up to 2 mg I-1 from domestic and other wastewater of similar composition requires no higher than 0.15 g m(-2)/day(-1) load of filters according to total P
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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