Abstract：
:The aim of this study was to investigate the performance of horizontal subsurface flow constructed wetlands planted with Typha latifolia treating tannery wastewater under long-term operation. Two expanded clay aggregates (Filtralite MR3-8-FMR and Filtralite NR3-8-FNR) and a fine gravel-FG were used as substrate for the constructed wetland units plus one unit with FMR was left as an unvegetated control. The systems were subject to three hydraulic loadings, 18, 8 and 6cmd(-1), and to periods of interruption in the feed. The relationship between the substrate, plant development and removal efficiency, especially of organic matter, was investigated. Organic loadings up to 1800kg BOD(5)ha(-1)d(-1) and 3849kg COD ha(-1)d(-1) were applied leading to mass removals of up to 652kg BOD(5)ha(-1)d(-1) and 1869kg COD ha(-1)d(-1), respectively. The three different substrates were adequate for the establishment of T. latifolia, although the clay aggregates allowed for higher plant propagation levels. The units with FNR and FMR achieved significantly higher COD and BOD5 removal when compared to the FG and to the unplanted units. The systems proved to be tolerant to high organic loadings and to interruptions in feed suggesting this technology as a viable option for the biological treatment of tannery wastewater.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Calheiros CS,Rangel AO,Castro PMdoi
10.1016/j.biortech.2008.01.043subject
Has Abstractpub_date
2008-10-01 00:00:00pages
6866-77issue
15eissn
0960-8524issn
1873-2976pii
S0960-8524(08)00081-3journal_volume
99pub_type
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