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  Efficient phosphorus recycling and heavy metal removal from wastewater sludge by a novel hydrothermal humification-technique

Zhang, S., Du, Q., Cheng, K., Antonietti, M., & Yang, F. (2020). Efficient phosphorus recycling and heavy metal removal from wastewater sludge by a novel hydrothermal humification-technique. Chemical Engineering Journal, 394: 124832. doi:10.1016/j.cej.2020.124832.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-3E64-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-4222-9
Genre: Journal Article

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 Creators:
Zhang, Shuaishuai, Author
Du, Qing, Author
Cheng, Kui, Author
Antonietti, Markus1, Author              
Yang, Fan1, Author
Affiliations:
1Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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Free keywords: Sludges, Hydrothermal humification, Phosphorus recycling, Heavy metal removal, Fertilizer
 Abstract: This publication presents a simple and low-cost hydrothermal humification (HTH) treatment of sewage sludge (SS) together with alkali ash (AA) and biomass for simultaneous implementation of heavy metal removal, nutrient recovery (P) and ash refining. The H/C and O/C atomic ratio plots obtained from elemental analysis demonstrate that dehydration and decarboxylation under hydrothermal conditions are elemental reactions leading to sludge/biomass decomposition and artificial humic matter formation. Introduction of plant biomass into sludge-derived samples and adjustment of KOH or alkali ash (AA) mass effectively improve the recovery of P element, realizing high contents of dissolved phosphorus (DP) (from 7045 to 10075 mg/L) at appropriate pH values (6.5 to 7.7). ICP-AES results indicate the drop of Cr and Cd content below detection limit together with a sharp decrease of the elements Cu (from 0.07 to 0.46 mg/g), Zn (from 0.15 to 0.98 mg/g) and Pb (from 0.067 to 0.142 mg/g) after HTH treatment in sludge-derived liquid products and the heavy metal elements enriched in sludge-derived solids can be recovered into industrial salts by subsequent treatment. Pot planting experiments are conducted to investigate the P-availability in both sludge-derived liquids and solids (after treatment of heavy metal recovery) for promotion of plant growth. A higher proportion of shoot-to-root weight (62.1% versus 46.2%) and preserved moisture contents (84.7% versus 83.7%) when compared to the control groups demonstrate the effect of the presence of more nutrients after addition of sludge-derived liquid products. This work could provide a smart, energy utilization and sustainable fertilization route for planting growth.

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Language(s): eng - English
 Dates: 2020-03-242020
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1016/j.cej.2020.124832
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Title: Chemical Engineering Journal
Source Genre: Journal
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Publ. Info: Lausanne : Elsevier
Pages: - Volume / Issue: 394 Sequence Number: 124832 Start / End Page: - Identifier: ISBN: 1385-8947