2015
DOI: 10.1016/j.scitotenv.2015.05.131
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Ultrasound coupled with Fenton oxidation pre-treatment of sludge to release organic carbon, nitrogen and phosphorus

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Cited by 64 publications
(12 citation statements)
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“…AOPs include ozonation [10], photocatalysis [11], and the Fenton process [12]. The classic Fenton oxidation showed some features [13], as nonselectivity oxidation derived by hydroxyl radical (·OH) generated from H 2 O 2 with Fe(II) [14], fast reaction rate, low cost, and low toxicity of reagents used. However, the homogeneous Fenton process also showed some significant drawbacks, such as the additional amounts of Fe 2+ increasing the formation of ferric hydroxide sludge [15], and the narrow available range of solution pH values (2)(3)(4) [16].…”
Section: Introductionmentioning
confidence: 99%
“…AOPs include ozonation [10], photocatalysis [11], and the Fenton process [12]. The classic Fenton oxidation showed some features [13], as nonselectivity oxidation derived by hydroxyl radical (·OH) generated from H 2 O 2 with Fe(II) [14], fast reaction rate, low cost, and low toxicity of reagents used. However, the homogeneous Fenton process also showed some significant drawbacks, such as the additional amounts of Fe 2+ increasing the formation of ferric hydroxide sludge [15], and the narrow available range of solution pH values (2)(3)(4) [16].…”
Section: Introductionmentioning
confidence: 99%
“…The ultrasonic cavitation effect can cause macromolecular organic compounds (including OP polymers) to change from being flocculated to being dispersed (Gong et al, 2015 ). Ultrasonic cavitation destabilizes the internal structures of OP macromolecules and weakens some chemical bonds, so free radicals such as •OH and •OOH (decomposition products of H 2 O 2 ) can react with the organic compounds and destroy OP functional groups and therefore decompose OP compounds to IP (Pehkonen and Zhang, 2002 ; Gifford et al, 2015 ).…”
Section: Resultsmentioning
confidence: 99%
“…High Ca and Mg concentrations were found in the samples (Table 1 ), indicating that sparingly soluble P species were responsible for an important proportion of the P released to the liquid phase under acidic conditions. The second step is the ultrasonic cavitation effect causing the OP macromolecules to change from being flocculated to being highly dispersed (Gong et al, 2015 ). The alternating positive and negative ultrasonic pressure applied causes micro-vesicles occurs to rapidly shrink, rupture, and collapse, and the sharply increasing temperatures of the air bubbles produced creates a gas-liquid interface that contributes to the cavitation effect (Jiang et al, 2014a ).…”
Section: Resultsmentioning
confidence: 99%
“…Furthermore, Sinha et al. (2014) and Tyagi and Lo (2013) stated that sludge has substantial amounts of nitrogen (2.4%–5.0% total solid) and phosphorus (0.5%–0.7% total solid; Gong et al., 2015 ). Halfhide et al.…”
Section: Discussionmentioning
confidence: 99%