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    In this study, the performance and mechanism of P release from Al-waste activated sludge (WAS) via wet-chemical treatment at different reaction times were investigated. The maximum P release (46% of TP) was achieved at 20 min when the pH was maintained at 2 during acidic treatment. During alkali treatment, the maximum P concentration (363.96 mg/L, 46.07%) was achieved at 10 min when pH was initially adjusted to 12. Acidic treatment took twice as long to achieve the same efficiency of released P as the alkali treatment. Furthermore, P release mainly originated from Al-P and Ca-P during acidic treatment and Al-P dissolution during alkali treatment. The cost of chemical consumption was 483.96 USD/ton TS sludge with acidic treatment, which was 8.49 times higher than that of alkali treatment without pH control. Thus, short reaction times (ca. 10 min) coupled with alkalization provide an effective approach for improving P release from Al-WAS. Copyright © 2021 Elsevier Ltd. All rights reserved.


    Wang Yan, Jiayi Wu, Yun Chen, Nan Shen, Guoxiang Wang, Xiankun Liu. Short reaction times coupled with alkalization improves the release of phosphorus from Al-waste activated sludge. Bioresource technology. 2021 Aug;333:125168

    PMID: 33892426

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