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Title: Phosphorus dissolution from dewatered anaerobic sludge: Effect of pHs, microorganisms, and sequential extraction
Authors: Vardanyan, Arevik 
Kafa, Nasia 
Konstantinidis, Viktoras 
Shin, Seung Gu 
Vyrides, Ioannis 
Keywords: Dewatered anaerobic sludge;Dewatered anaerobic sludge treatment;P fractionation;P mass balance;Phosphorus (P) dissolution
Category: Environmental Engineering
Field: Engineering and Technology
Issue Date: Feb-2018
Publisher: Elsevier Ltd
Source: Bioresource Technology, 2018, Volume 249, Pages 464-472
Abstract: Phosphorus (P) and iron mass balance from Limassol Wastewater Treatment Plant showed that the major removal and accumulation occurred at the aerobic secondary stage and at Dewatered Anaerobic Sludge (DWAS), respectively. The purpose of this study was to examine various parameters that effect the P dissolution under low pH from DWAS. The parameters that significantly contribute to P extraction were the exposure to pH 2.5, the anaerobic conditions and the sequential extraction. The addition of chemolithotrophic acidophilic bacteria has negatively influenced P dissolution, whereas the addition of acidophilic Heterotrophic Iron Reducing (HIR) bacteria has slightly increased P dissolution but they contributed to pH maintenance at lower levels compared to no addition of HIR. P fractionation of the residual sludge after sequential extraction pointed out that the organically bound P was hardly dissoluted from DWAS. The residual DWAS after acid treatment generated around 45% less methane compared to the initial DWAS.
ISSN: 09608524
DOI: 10.1016/j.biortech.2017.09.188
Rights: © 2017 Elsevier Ltd
Type: Article
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