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Reliability of nitrogen removal processes in multistage treatment wetlands receiving high-strength wastewater

Abstract

reatment wetlands have been proved to be more effective than conventional treatment processes in case of high-strength wastewater containing high concentrations of ammonium nitrogen and recalcitrant organic matter. In this study nitrogen removal processes and reliability of nitrogen removal at two identical pilot-scale multistage treatment wetlands (MTWs) receiving real, non-synthetic wastewater were discussed. The wastewater discharged to pilot-scale subsurface flow MTWs contained high ammonium nitrogen concentrations and limited biodegradable organic matter (OM) concentrations. One of the pilot MTWs was fed with landfill leachate (LL) and another one with reject water from sewage sludge centrifugation (RW). In the first season of operation both MTWs reached very high (95–99%) efficiency of total nitrogen (TN) removal, which was explained by adsorption to the substrate. In the later period, TN was removed in a sequence of nitrification and denitrication processes with lower efficiency (40–86%). The denitrification process was the limiting one at the LL treating site because of too low carbon supply. Still, during the whole investigation period TN outflow concentrations were at the level that allows for co-treatment of the effluent in municipal wastewater treatment plants without risk for biological treatment processes. In 90% of samples TN concentration was below 200 mg/l and in 60% of samples it was below 145 mg/l.

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
ECOLOGICAL ENGINEERING no. 98, pages 365 - 371,
ISSN: 0925-8574
Language:
English
Publication year:
2017
Bibliographic description:
Wojciechowska E., Gajewska M., Ostojski A.: Reliability of nitrogen removal processes in multistage treatment wetlands receiving high-strength wastewater// ECOLOGICAL ENGINEERING. -Vol. 98, (2017), s.365-371
DOI:
Digital Object Identifier (open in new tab) 10.1016/j.ecoleng.2016.07.006
Verified by:
Gdańsk University of Technology

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