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 ...

A permeable reactive barrier, consisting of a mixture of compost and calcite gravel, was built in Aznalcóllar (SW Spain) to treat acidic groundwater containing zinc, aluminium and copper. Monitoring results show that practically no dissolved sulphate is reduced as water flows through the barrier, which has a residence time of about 1 to 2 days. Despite this lack of bacterial activity significan...

In this work we demonstrate the potential of permanent magnet based magnetic resonance sensors to monitor and assess the extent of pore clogging in water filtration systems. The performance of the sensor was tested on artificially clogged gravel substrates and on gravel bed samples from constructed wetlands used to treat wastewater. Data indicate that the spin lattice relaxation time is linearl...

This paper presents the study of the metals removal mechanisms in microcosm upflow constructed wetlands used for polishing of synthetic electroplating wastewater. Four types of columns were used: with and without plants and with different bed media (peat or gravel). The main design goal of the columns with peat was to promote precipitation of metals with biogenic sulfides produced by sulfate-re...

Sand Intermittent Filtration (SIF) is an established technology of wastewater treatment and in recent years it gains renewed interest due to its simplicity less energy requirement. The aim the present study was evaluate modified filter-bed Reactor using Sand-intermittent-filtration for removal physicochemical parameters viz dissolved oxygen (DO), biochemical demand (BOD), chemical (COD), total ...

This study evaluates the effect of hydraulic loading rate (HLR), aspect ratio, granular medium size and water depth on the removal of selected contaminants during the start up of horizontal subsurface flow reed beds (HFRBs). Experiments were carried out in a pilot-scale HFRB system comprising four pairs of lined beds of almost equal surface area (54-56 m(2) each bed), with the following aspect ...

Water is one of the most important resources, and its availability for drinking, irrigation, and ecosystem’s habitat is still subject to anthropogenic disturbance. During the last decades, understanding aquatic pollution and improvement in water management have developed. One of the most effective achievements concerning water use is surely the establishment of biofilm reactors in common wastew...

The 2008-2009 eruption of Chaitén Volcano (Chile) involved a variety of volcanic and associated hydrologic processes that damaged nearby forests. These processes included coarse (gravel) and fine (silt to sand) tephra fall, a laterally directed blast, fluvial deposition of remobilized tephra, a variety of low-temperature mass-movement processes, and a pyroclastic flow. Each of these geophysical...