Field application of a planted fixed bed reactor (PFR) for support media and rhizosphere investigation using undisturbed samples from full-scale constructed wetlands

被引:7
作者
Barreto, A. B. [1 ]
Vasconcellos, G. R. [1 ]
von Sperling, M. [1 ]
Kuschk, P. [2 ]
Kappelmeyer, U. [2 ]
Vasel, J. L. [3 ]
机构
[1] Univ Fed Minas Gerais, Dept Sanit & Environm Engn, BR-31270901 Belo Horizonte, MG, Brazil
[2] UFZ Helmholtz Ctr Environm Res, Environm Biotechnol UBT, D-04318 Leipzig, Germany
[3] Univ Liege, Dept Sci & Environm Management, Unit Environm & Sanitat, B-4000 Liege, Belgium
关键词
horizontal subsurface-flow constructed wetlands; planted fixed bed reactor; rhizosphere; redox potential; WASTE-WATER TREATMENT; FLOW; PERFORMANCE; BACTERIA; DYNAMICS; REMOVAL; MODEL;
D O I
10.2166/wst.2015.238
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study presents a novel method for investigations on undisturbed samples from full-scale horizontal subsurface-flow constructed wetlands (HSSFCW). The planted fixed bed reactor (PFR), developed at the Helmholtz Center for Environmental Research (UFZ), is a universal test unit for planted soil filters that reproduces the operational conditions of a constructed wetland (CW) system in laboratory scale. The present research proposes modifications on the PFR original configuration in order to allow its operation in field conditions. A mobile device to obtain undisturbed samples from real-scale HSSFCW was also developed. The experimental setting is presented with two possible operational configurations. The first allows the removal and replacement of undisturbed samples in the CW bed for laboratory investigations, guaranteeing sample integrity with a mobile device. The second allows the continuous operation of the PFR and undisturbed samples as a fraction of the support media, reproducing the same environmental conditions outside the real-scale system. Investigations on the hydrodynamics of the adapted PFR were carried out with saline tracer tests, validating the proposed adaptation. Six adapted PFR units were installed next to full-scale HSSFCW beds and fed with interstitial liquid pumped from two regions of planted and unplanted support media. Fourteen points were monitored along the system, covering carbon fractions, nitrogen and sulfate. The results indicate the method as a promising tool for investigations on CW support media, rhizosphere and open space for studies on CW modeling, respirometry, kinetic parameters, microbial communities, redox potential and plant influence on HSSFCW.
引用
收藏
页码:553 / 560
页数:8
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