NDLI: Assessment of long-term phosphorus retention in an integrated constructed wetland treating domestic wastewater

Content Provider	Springer Nature Link
Author	Dzakpasu, Mawuli Scholz, Miklas McCarthy, Valerie Jordan, Siobhán N.
Copyright Year	2014
Abstract	Due to the nature of the phosphorus (P) removal mechanisms associated with constructed wetlands, the sustainability of P treatment is usually of high interest. As a result, a 4-year dataset from a typical multi-celled integrated constructed wetland (ICW) located at Glaslough in Co. Monaghan, Ireland was evaluated to determine the effects of long-term P loadings and hydrological inputs on P treatment. The ICW was intensively monitored year-round from February 2008 through March 2012 for total P and molybdate reactive phosphate (MRP). Domestic wastewater was loaded at 16.4 ± 0.96 g m$^{2}$ year$^{−1}$ for total P and 11.2 ± 0.74 g m$^{2}$ year$^{−1}$ for MRP. Average mass reductions over the monitoring period were 91.4 and 90.1 %, respectively. The area-based kinetic coefficients (K $_{(20)}$) of 11.8 for total P and 15.6 m year$^{−1}$ for MRP indicated a high area-specific retention rate. The ICW appeared to have a sustained capacity for P adsorption and retention, but the treatment was influenced mainly by external hydrological inputs and fluctuations in wastewater loadings. Linear regression analyses showed a reduction in mass retention of both total P and MRP with increased effluent flow volumes. Monthly mass reductions exceeded 90 % when the effluent flow volumes were less than 200 m$^{3}$ day$^{−1}$. When monthly effluent flow volumes exceeded 200 m$^{3}$ day$^{−1}$, nonetheless, mass reductions became highly variable. Designs and management of ICW systems should adopt measures to limit external hydrological loadings in order to maintain sufficient P treatment.
Starting Page	305
Ending Page	313
Page Count	9
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	22
Issue Number	1
e-ISSN	16147499
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-07-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Constructed wetland Domestic wastewater Kinetic constant Long-term performance Phosphorus Retention Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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