Please use this identifier to cite or link to this item: https://doi.org/10.1080/10934529.2014.897535
Title: In situ removal of dissolved and suspended contaminants from a eutrophic pond using hybrid sand-filter
Authors: Vijayaraghavan, K. 
Joshi, U.M.
Ping, H. 
Reuben, S.
Burger, D.F.
Keywords: biosorption
eutrophication
filtration
Heavy metals
pollution control
water quality
Issue Date: 24-Aug-2014
Source: Vijayaraghavan, K., Joshi, U.M., Ping, H., Reuben, S., Burger, D.F. (2014-08-24). In situ removal of dissolved and suspended contaminants from a eutrophic pond using hybrid sand-filter. Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering 49 (10) : 1176-1186. ScholarBank@NUS Repository. https://doi.org/10.1080/10934529.2014.897535
Abstract: In this study, in situ hybrid sand filters were designed to remove dissolved and suspended contaminants from eutrophic pond. Currently, there are no attempts made to eradicate dissolved as well as suspended contaminants from eutrophic water system in a single step. Monitoring studies revealed that examined pond contain high chlorophyll-a content (101.8 g L-1), turbidity (39.5 NTU) and total dissolved solids concentration (0.04 g L -1). Samples were further exposed to extensive water quality analysis, which include examining physicochemical parameters (pH, conductivity, total dissolved solids, salinity, turbidity and chlorophyll-a), metals (Na, K, Ca, Mg, Al, Fe, Cu, Cd, Pb, Zn, Cr, and Ni) and anions (NO3, NO 2, PO4, SO4, Cl, F and Br). To tackle pollutants, filtration system was designed to comprise of several components including fine sand, coarse sand/sorbent mix and gravel from top to bottom loaded in fiberglass tanks. All the filters (activated carbon, Sargassum and zeolite) completely removed algal biomass and showed potential to decrease pH during entire operational period of 20 h at 120 L h-1. To examine the efficiency of filters in adverse conditions, the pond water was spiked with heavy metals (Cu, Cd, Pb, Zn, Cr, and Ni). Of the different filter systems, Sargassum-loaded filter performed exceedingly well with concentrations of heavy metals never exceeded the Environmental protection agency regulations for freshwater limits during total operational period. The total uptake capacities at the end of the fifth event were 24.9, 20.5, 0.58, 5.2, 0.091 and 2.8 mg/kg for Cr, Ni, Cu, Zn, Cd and Pb, respectively. Copyright © Taylor & Francis Group, LLC.
Source Title: Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/128681
ISSN: 15324117
DOI: 10.1080/10934529.2014.897535
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