Use of dewatered alum sludge as main substrate in treatment reed bed receiving agricultural wastewater: Long-term trial

Zhao, Y. Q., Zhao, X. H. and Babatunde, Akintunde 2009. Use of dewatered alum sludge as main substrate in treatment reed bed receiving agricultural wastewater: Long-term trial. Bioresource Technology 100 (2) , pp. 644-648. 10.1016/j.biortech.2008.07.040

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Abstract

This study aims to explore a novel application of dewatered alum sludge cakes (DASC) as the main medium in a single model reed bed to treat phosphorus-rich animal farm wastewater under “tidal flow” operation on a long-term basis. It is expected that the cakes act as the carrier for developing biofilm and also serve as adsorbent to enhance phosphorus (P) immobilization. Results have demonstrated that average removal efficiencies of 73.3 ± 15.9% for COD, 82.9 ± 12.3% for BOD5, 86.4 ± 6.0% for RP (reactive P), 88.6 ± 7.2% for soluble reactive P (SRP) and 77.6 ± 17.5% for SS can be achieved during the two year’s operation. More significantly, the “P-adsorption proportion” by DASC in the reed bed is 42% of the overall P removal. The remaining removal of P may be contributed by the trapping and filtration process of DASC. Therefore, the lifetime of the DASC in reed bed is reasonably longer than that determined from the batch isotherm test.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TD Environmental technology. Sanitary engineering
Uncontrolled Keywords:	Dewatered alum sludge; Phosphorus; Reed bed; Tidal flow strategy; Wastewater treatment
Publisher:	Elsevier
ISSN:	0960-8524
Last Modified:	04 Jun 2017 04:10
URI:	https://orca.cardiff.ac.uk/id/eprint/33994

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