Solids distribution and hydraulic conductivity in multi-cell horizontal subsurface flow constructed wetlands

•Solids loading rate and hydraulic conductivity in constructed wetland were studied.•Total and volatile suspended solids were high in interstitial spaces.•There was an inverse relation between accumulated solids and hydraulic conductivity.•Lower clogging index (Ci) values could represent more proble...

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Bibliographic Details
Published in:Ecological engineering 2017-10, Vol.107, p.49-55
Main Authors: Lancheros, Juan Camilo, Pumarejo, Carlos Alberto, Quintana, Josué Carlos, Caselles-Osorio, Aracelly, Casierra-Martínez, Henry Alberto
Format: Article
Language:English
Subjects:
Artificial wetlands
Clogging
Conductivity
Constructed wetlands
Dimensionless numbers
Distribution
Gravel
Horizontal cells
Hydraulics
Permeability coefficient
Spatial distribution
Storm seepage
Studies
Subsurface-flow
Suspended particulate matter
Total solids
Total suspended solids
Tropical climate
Volatile solids
Washing
Wetlands
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Summary:•Solids loading rate and hydraulic conductivity in constructed wetland were studied.•Total and volatile suspended solids were high in interstitial spaces.•There was an inverse relation between accumulated solids and hydraulic conductivity.•Lower clogging index (Ci) values could represent more problems of clogging. This study evaluated the accumulated solids spatial distribution and their relationship with hydraulic conductivity (K) in a multi-cell horizontal subsurface flow (HSSF) constructed wetland (CW). The system is located near the Caribbean Coast of Colombia where tropical conditions reign. After three years of operation, total suspended solids (TSS) and volatile suspended solids (VSS) accumulated within the interstitial spaces and those that adhered to the surface of the gravel were quantified. Samples were collected at six points and at two depths (0.1 and 0.35m) within each of five cells of the CW. Similar quantifications were made three months after a washing process of the granular bed. The average values for the first samples collected were 3.129kgm−2 TSS and 35.5% VSS. The average values for the second samples collected were 0.224kgm−2 TSS and 42.7% VSS. K values were measured after the gravel washing process using the falling head method. K values registered above 400md−1, which coincided with the low amount of accumulated TSS (
ISSN:0925-8574
1872-6992
DOI:10.1016/j.ecoleng.2017.06.055