Controlled field studies on soil aquifer treatment in a constructed coastal sandfill
Data(s) |
01/01/2009
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Resumo |
A controlled artificial recharge experiment was conducted to investigate the effect of soil aquifer treatment during percolation of secondary and tertiary (ultrafiltered) treated wastewater through the shallow vadoze zone of a newly constructed coastal sandfill. The sandfill is a reclaimed land constructed from marine sand dredged from the seabed. To obtain 1-D flow, a stainless steel column was driven to a depth of 2.5 m, penetrating the phreatic surface. Wastewater was percolated through the column under fully-saturated and unsaturated conditions. Infiltration rates, dissolved organic carbon (DOC) and ultra-violet absorption (UVA) were monitored. The wastewaters were recharged at similar infiltration rates of approximately 5.5 m/day and 3.5 m/day under fully-saturated and unsaturated conditions, respectively. In both cases, clogging occurred 40 days after the start of recharge, under saturated conditions. For secondary treated wastewater, DOC concentration (mg/l) reduced by 28% and 13% under unsaturated and saturated conditions, respectively. The corresponding UVA reduction was 19.4% and 14.1%. Similar reductions in DOC were observed for the tertiary treated wastewater; however, the reduction in UVA was higher; 28% and 22% under unsaturated and saturated conditions, respectively. On an mass removal (mg/m(2) DOC) basis, DOC reduction appeared to be more significant under unsaturated conditions. This is attributed to the presence of interstitial oxygen. |
Identificador | |
Idioma(s) |
eng |
Publicador |
IWA Publishing |
Relação |
http://dro.deakin.edu.au/eserv/DU:30063747/chua-controlledfieldstudies-2009.pdf http://dx.doi.org/10.2166/wst.2009.408 |
Direitos |
2009, IWA Publishing |
Palavras-Chave | #silicon dioxide #soil #waste disposal #oceans #seas #filtration #solubility #surface properties #organic chemicals #ultraviolet rays |
Tipo |
Journal Article |