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  5. Investigation of phosphorus desorption from P-saturated alum sludge used as a substrate in constructed wetland
 
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Investigation of phosphorus desorption from P-saturated alum sludge used as a substrate in constructed wetland

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Author(s)
Zhao, X.H. 
Zhao, Y.Q. 
Uri
http://hdl.handle.net/10197/3134
Date Issued
07 April 2009
Date Available
30T15:45:04Z August 2011
Abstract
Phosphorus (P) desorption from P-saturated alum sludge, which was used as main substrate in a novel constructed wetland for wastewater treatment, was studied. Groups of batch experiments were designed and conducted to explore the efficiencies of P extraction using different acids (HCl, HNO3, H2SO4) and bases (NaOH, KOH). The results showed that either acid or base is efficient for P-extraction and the efficiency relied mainly on the concentrations of H+/OH-, not the type of acid or base. Considering the efficiency, price and safety of the acids and bases tested, H2SO4 was chosen as most suitable reagent for P-extraction. A Box-Behnken experimental design based on the response surface methodology (RSM) was applied to evaluate the optimum of H2SO4 extraction. The optimal condition for the mass of sludge, H2SO4 concentration and volume was 0.8 g, 0.063 M and 142 ml, respectively. At such optimal condition, the maximum P-extraction efficiency of 98.2 % was achieved. Additionally, most of the main components of the saturated sludge, such as metals (Al, Ca, Mg, Fe), TOC (total organic carbon) and nitrogen can also be extracted. Overall, the results supported that H2SO4 seems to be an efficient and cost-effective reagent among all the reagents tested for P-saturated alum sludge treatment.
Sponsorship
Other funder
Other Sponsorship
Environmental Protection Agency
Type of Material
Journal Article
Publisher
Elsevier
Journal
Separation and Purification Technology
Volume
66
Issue
1
Start Page
71
End Page
75
Copyright (Published Version)
2008 Elsevier B.V.
Keywords
  • Phosphorus

  • Desorption

  • Acid

  • Base

  • Alum sludge

  • RSM

  • Constructed wetland

Subject – LCSH
Phosphorus
Water treatment plant residuals
Response surfaces (Statistics)
Constructed wetlands
Chemical tests and reagents
DOI
10.1016/j.seppur.2008.11.020
Web versions
http://dx.doi.org/10.1016/j.seppur.2008.11.020
Language
English
Status of Item
Peer reviewed
ISSN
1383-5866
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-sa/1.0/
Owning collection
Civil Engineering Research Collection
Scopus© citations
36
Acquisition Date
Feb 2, 2023
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