Avoiding clogging in constructed wetlands by using anaerobic digesters as pre-treatment

Varga, D. de la; Díaz, Mario; Ruíz, I.; Soto, M.

doi:10.1016/j.ecoleng.2012.11.005

Cited by 85 publications

(22 citation statements)

References 18 publications

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“…Low energy requirements, easy operation and maintenance, modest installation and maintenance costs, minor sludge production, and the creation of a visually pleasing landscape are some advantages of this technology [5,13,14]. The clogging of granular media is one of the main operation problems in subsurface flow constructed wetlands [15]. It is linked to media type and it, in turn, is linked to hydraulic retention time since the hydraulic conductivity of porous media is very sensitive to media size and is influenced by particle size distribution and particle shape [16].…”

Section: Introductionmentioning

confidence: 99%

“…However, they need a large land area [18] and therefore, it is sometimes necessary to add a previous treatment stage to the natural treatment system [18,19]. Anaerobic processes are a treatment technology that can be effectively integrated with constructed wetlands because they require a very small input of energy, minimum investment and operational costs, generate less biosolids when compared to conventional aerobic systems, and they can prevent clogging [15,18,20,21]. The up-flow anaerobic filter (UAF), as part of this technology, is able to treat wastewater with different pollutant loadings and it is successfully used, specifically for small communities in warm climates, to achieve the desired water quality.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of the Hydraulic Retention Time on the Performance of an Ecological Wastewater Treatment System: An Anaerobic Filter with a Constructed Wetland

Merino-Solís

Villegas

Anda

et al. 2015

Water

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This work assesses the performance of a municipal pilot wastewater treatment system employing an up-flow anaerobic filter (UAF) followed by a horizontal subsurface constructed wetland (HSSCW). This pilot scale demonstration project was implemented in a zone with subtropical climate in order to protect Lake Chapala from wastewater loads that are discharged by small communities in the Lake's vicinity. The filters were filled with tezontle as the media for biofilm support and the HSSCW was planted with two ornamental plants species, Canna hybrids and Strelitzia reginae. The experiment evaluated three hydraulic retention times (HRT) of 18, 28 and 38 h in the UAF, which corresponds to two, three and four days in HSSCW over 66 weeks. The mean efficiencies found for the complete system were 80% and 90% of BOD, 80% and 86% of COD, 30% and 33% of Ntot and between 24% and 44% of Ptot. It was possible to remove almost 80% of organic matter in 18 h in the UAF while the HSSCW reached 30% of removal for Ntot in a HRT of three days. As expected, the UAF was responsible for removing most of the organic matter and the HSSCW removed most of the nitrogen. OPEN ACCESSWater 2015, 7 1150

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of the Hydraulic Retention Time on the Performance of an Ecological Wastewater Treatment System: An Anaerobic Filter with a Constructed Wetland

Merino-Solís

Villegas

Anda

et al. 2015

Water

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“…En los HC, la incorporación de sólidos hacia el lecho puede conducir a su colmatación, siendo muy importante que se dé un tiempo de interacción entre estos y el sistema. Otros aspectos como los malos diseños, las altas cargas orgánicas y los errores en la metodología de operación, también se asocian con la colmatación de los HC (CasellesOsorio et al 2007;Zhao et al 2009;De la Varga et al 2013). …”

Section: Eficiencia De Los Humedales Construidosunclassified

Remoción de cipermetrina presente en el baño de ganado utilizando humedales construidos

Marrugo‐Negrete

Ortega-Ruíz

Frómeta

et al. 2016

CTA

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<p>Ectoparasite control in the livestock sector involves the use of chemicals to prevent production losses. In small farms that produce milk in the Córdoba department, the use of the pumping system for the cattle bath is common between farmers. In this work, cypermethrin degradation efficiency was evaluated in three lab-scale subsurface flow constructed wetland planted with Limnocharis flava, Cyperus papyrus and Alpinia purpurata sp., and one unplanted system, all of the beds were gravel based; then, total suspended solids and total phosphorus retention, and elimination of chemical oxygen demand were measured as water quality parameters. The wastewater was pretreated in a descending-ascending slow sand filter, and then was conducted to a wetland continuous flow fed at 7 ml/min. Limnocharis flava bed was higher for the degradation of organic compounds, with 97.9 ± 2.5 % and 69.1 ± 3.7 % for cypermethrin and chemical oxygen demand respectively, with statistically significant differences (p < 0,05) respect to unplanted bed. The higher SST removal were found in the Cyperus papyrus wetland, with 62,0 %, however, no differences were observed with the other evaluated planted systems, as opposed these were significantly higher than unplanted wetlands.</p>

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“…Nowadays, this is usually done with Imhoff and septic tanks and more recently with UASB reactors (de la Varga et al 2013), but these anaerobic systems require large volumes and generate methane, a greenhouse gas that reduces their environmental sustainability. In consequence, the selected system should be aerobic or at least minimize anaerobic conditions, perform well under high organic loadings without clogging and offer similar or better efficiencies to the already existing Imhoff and septic tanks.…”

Section: Performance Of the Ovfmentioning

confidence: 99%

Clogging reduction and removal of hormone residues with laboratory-scale vertical flow organic-based filter and hybrid wetland

Melián

Torres-Padrón

Betancor-Abreu

et al. 2014

Int. J. Environ. Sci. Technol.

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A laboratory-scale, intermittently fed, organicbased vertical flow filter was tested as a pre-treatment of high-strength urban wastewater to reduce the risk of clogging in treatment wetlands. At an average hydraulic loading rate of 815 L/m 2 day and average surface loading rates of biological oxygen demand of 458 g/m 2 day, chemical oxygen demand of 594 g/m 2 day and suspended solids of 310 g/m 2 day, the organic-based vertical flow filter achieved removal efficiencies of 48 % of biological oxygen demand, 45 % of chemical oxygen demand, 69 % of suspended solids and 51 % of turbidity. For this unit, removals were significantly correlated with organic surface loading rates but not with hydraulic loading rate. Additionally, the organic-based vertical flow filter removed almost completely the hormone residues studied: estrone, 17b-estradiol, 17b-ethynyl estradiol, diethylstilbestrol, estriol, norethisterone and testosterone, most probably by the combination of adsorption onto the organic substrate and biodegradation. The efficiency of the combined system was remarkable for biological oxygen demand (97 %), chemical oxygen demand (89 %), suspended solids and turbidity (99 %), fecal coliforms and E. coli (99.9 %) and fecal enterococci (99 %).

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Avoiding clogging in constructed wetlands by using anaerobic digesters as pre-treatment

Cited by 85 publications

References 18 publications

The Effect of the Hydraulic Retention Time on the Performance of an Ecological Wastewater Treatment System: An Anaerobic Filter with a Constructed Wetland

The Effect of the Hydraulic Retention Time on the Performance of an Ecological Wastewater Treatment System: An Anaerobic Filter with a Constructed Wetland

Remoción de cipermetrina presente en el baño de ganado utilizando humedales construidos

Clogging reduction and removal of hormone residues with laboratory-scale vertical flow organic-based filter and hybrid wetland

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