Nitrogen removal in pilot-scale partially saturated vertical wetlands with and without an internal source of carbon

The Science of the Total Environment
Nancy B MartínezFlorentina Zurita

Abstract

The aim was to evaluate and compare total nitrogen (TN) removal in pilot-scale partially saturated vertical wetlands (PSVWs) with and without an internal solid source of organic carbon (corncob) in order to distinguish the role of nitrification-denitrification and ANAMMOX in the removal process. The height of the free-drainage zone (FDZ) was 40 cm and the saturated zone (SZ) was 30 cm in system I (SI) and system II (SII) and 40 cm in system III (SIII) and system IV (SIV). In SII and SIV, approximately 30 kg of dry, 5 cm-length corncob was added. The systems were evaluated during two periods, that is, P1 and P2. Measurements of water quality parameters including BOD5, COD, organic nitrogen (Org-N), ammonium, nitrate and nitrite were taken in the influent and effluents on a weekly basis; nitrate measurements were also taken at the interface. Measurements of pH, dissolved oxygen (DO) and oxidation-reduction potential (ORP) were taken in the SZ. The height of both SZ (40 cm vs. 30 cm in P1) and FDZ (40 vs. 25 and 30 cm in SI/SIII in P2) did not affect the efficiencies (p > 0.05) but the presence or absence of corn cob did (p < 0.05). Thus, SII and SIV were superior when compared to SI and SIII (p < 0.05) with TN average removal eff...Continue Reading

Citations

Dec 5, 2019·International Journal of Environmental Research and Public Health·Carlos NakaseLuis Sandoval
Apr 29, 2019·Environmental Science and Pollution Research International·Lingwei KongYifan Yang
Aug 29, 2020·Journal of Environmental Management·Xi NanAttilio Toscano
Nov 15, 2020·International Journal of Environmental Research and Public Health·Md Ekhlasur RahmanS M Shamsuzzaman

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