2024-03-28T14:34:34Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1500912018-07-20T07:10:56Zcom_10261_88com_10261_8col_10261_341
2017-05-22T10:49:02Z
urn:hdl:10261/150091
Enhancement of carbon and nitrogen removal by helophytes along subsurface water flowpaths receiving treated wastewater
Ribot, Miquel
Bernal, Susana
Nikolakopoulou, Myrto
Vaessen, Timothy N.
Cochero, Joaquín
Gacia, Esperança
Sorolla, Albert
Argerich, A.
Sabater, Francesc
Isnard, Manel
Martí, Eugènia
Este artículo contiene10 páginas, 2 tablas, 6 figuras.
Wastewater treatment plant (WWTP) effluents are sources of dissolved organic carbon (DOC) and inorganic nitrogen
(DIN) to receiving streams, which can eventually become saturated by excess of DIN. Aquatic plants
(i.e., helophytes) can modify subsurface water flowpaths as well as assimilate nutrients and enhance microbial
activity in the rhizosphere, yet their ability to increase DIN transformation and removal in WWTP-influenced
streams is poorly understood. We examined the influence of helophytes on DIN removal along subsurface
water flowpaths and how this was associated with DOC removal and labile C availability. To do so, we used a
set of 12 flow-through flumes fed with water from aWWTP effluent. The flumes contained solely sediments or
sediments with helophytes. Presence of helophytes in the flumes enhanced both DIN and DOC removal. Experimental
addition of a labile C source into the flumes resulted in a high removal of the added C within the first
meter of the flumes. Yet, no concomitant increases in DIN removal were observed. Moreover, results from laboratory
assays showed significant increases in the potential denitrifying enzymeactivity of sediment biofilms from
the flumes when labile C was added; suggesting denitrification was limited by C quality. Together these results
suggest that lack of DIN removal response to the labile C addition in flumeswas likely because potential increases
in denitrification by biofilms from sediments were counterbalanced by high rates of mineralization of dissolved organic matter. Our results highlight that helophytes can enhance DIN removal in streams receiving inputs from
WWTP effluents; and thus, they can become a relevant bioremediation tool inWWTP-influenced streams. However,
results also suggest that the quality of DOC fromtheWWTP effluent can influence theN removal capacity of
these systems
2017-05-22T10:49:02Z
2017-05-22T10:49:02Z
2017
artículo
Science of the Total Environment 599-600 : 1667-1676 (2017)
0048-9697
http://hdl.handle.net/10261/150091
10.1016/j.scitotenv.2017.05.114
eng
http://dx.doi.org/10.1016/j.scitotenv.2017.05.114
Sí
closedAccess
Elsevier