Nutrient and dissolved organic carbon removal from natural waters using industrial by-products

Wendling, Laura A., Douglas, Grant B., Coleman, Shandel and Yuan, Zheng (2013) Nutrient and dissolved organic carbon removal from natural waters using industrial by-products. Science of The Total Environment, 442 63-72. doi:10.1016/j.scitotenv.2012.10.008


Author Wendling, Laura A.
Douglas, Grant B.
Coleman, Shandel
Yuan, Zheng
Title Nutrient and dissolved organic carbon removal from natural waters using industrial by-products
Journal name Science of The Total Environment   Check publisher's open access policy
ISSN 0048-9697
1879-1026
Publication date 2013-01-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.scitotenv.2012.10.008
Open Access Status
Volume 442
Start page 63
End page 72
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Highlights
► The CaO-based WTR effectively removed DOC and P in column trials and had a high P sorption capacity.
► Granular activated carbon attenuated organic contaminants but was unsuitable for P attenuation.
► Fly ash removed a suite of both inorganic and organic nutrients and DOC from water but released Se.
► By-products may mitigate eutrophication through targeted use in nutrient intervention schemes.

Attenuation of excess nutrients in wastewater and stormwater is required to safeguard aquatic ecosystems. The use of low-cost, mineral-based industrial by-products with high Ca, Mg, Fe or Al content as a solid phase in constructed wetlands potentially offers a cost-effective wastewater treatment option in areas without centralised water treatment facilities. Our objective was to investigate use of water treatment residuals (WTRs), coal fly ash (CFA), and granular activated carbon (GAC) from biomass combustion in in-situ water treatment schemes to manage dissolved organic carbon (DOC) and nutrients. Both CaO- and CaCO3-based WTRs effectively attenuated inorganic N species but exhibited little capacity for organic N removal. The CaO-based WTR demonstrated effective attenuation of DOC and P in column trials, and a high capacity for P sorption in batch experiments. Granular activated carbon proved effective for DOC and dissolved organic nitrogen (DON) removal in column trials, but was ineffective for P attenuation. Only CFA demonstrated effective removal of a broad suite of inorganic and organic nutrients and DOC; however, Se concentrations in column effluents exceeded Australian and New Zealand water quality guideline values. Water treated by filtering through the CaO-based WTR exhibited nutrient ratios characteristic of potential P-limitation with no potential N- or Si-limitation respective to growth of aquatic biota, indicating that treatment of nutrient-rich water using the CaO-based WTR may result in conditions less favourable for cyanobacterial growth and more favourable for growth of diatoms. Results show that selected industrial by-products may mitigate eutrophication through targeted use in nutrient intervention schemes.
Keyword Water treatment residuals
Eutrophication
Dissolved organic carbon
Water treatment
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Available online 21 November 2012

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Agriculture and Food Sciences
 
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Created: Sat, 01 Feb 2014, 02:07:38 EST by Laura Wendling on behalf of School of Agriculture and Food Sciences