A promising approach of reject water treatment using a tidal flow constructed wetland system employing alum sludge as main substrate

Files in This Item:
File Description SizeFormat 
4-WST-2011.pdf298.27 kBAdobe PDFDownload
Title: A promising approach of reject water treatment using a tidal flow constructed wetland system employing alum sludge as main substrate
Authors: Yang, Y.
Zhao, Y.Q.
Wang, S.P.
Guo, X.C.
Ren, Y.X.
Wang, L.
Wang, X.C.
Permanent link: http://hdl.handle.net/10197/3207
Date: Jun-2011
Online since: 2011-10-06T16:11:17Z
Abstract: This study examined a novel reuse of the alum sludge, an inescapable by-product of the production of drinking water when aluminium salt is added as a coagulant, as the main medium in a laboratory-scale multi-stage constructed wetland (CW) system for reject water treatment. Such reject water is a main concern in municipal wastewater treatment plant (MWWTP) for increasing the organic and nutrient loading. A “tidal flow” strategy was employed to enhance the wetland aeration to stimulate organic pollutants and N oxidation while the “step feed” operation was adopted to supply the necessary amount of carbon source for denitrification. The results reveal that alum sludge acted as P adsorbent can secure the P removal. Meanwhile, high removals of ammoniacal-nitrogen and organic matters can also be obtained due to the active bacteria attached growth on the alum sludge surface. The results show that average removal efficiencies of 65.4 ± 12.3% for COD, 67.8 ± 9.2% for BOD5, 33.6 ± 17.0% for N and 99.5 ± 0.49% for P can be achieved over a period of 190 days. This indicates that novel reuse of alum sludge as medium in CW system can provide a promising approach for reject water treatment. Therefore, it will significantly reduce the amount of pollutants feedback through reject water recycling in a MWWTP.
Funding Details: Not applicable
Type of material: Journal Article
Publisher: IWA Publishing
Journal: Water Science & Technology
Volume: 63
Issue: 10
Start page: 2367
End page: 2373
Copyright (published version): IWA Publishing 2011
Keywords: Alum sludgeConstructed wetlandNutrient controlReject waterReuseWastewater treatment plant
Subject LCSH: Water treatment plant residuals
Constructed wetlands
Sewage--Purification--Nutrient removal
Water treatment plants
DOI: 10.2166/wst.2011.575
Other versions: http://dx.doi.org/10.2166/wst.2011.575
Language: en
Status of Item: Peer reviewed
Appears in Collections:Centre for Water Resources Research Collection
Urban Institute Ireland Research Collection
Civil Engineering Research Collection

Show full item record

Citations 20

Last Week
Last month
checked on Feb 11, 2019

Page view(s) 10

checked on May 25, 2018

Download(s) 5

checked on May 25, 2018

Google ScholarTM



This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.