Slow pyrolysis enhances the recovery and reuse of phosphorus and reduces metal leaching from biosolids

Roberts, David A., Cole, Andrew J., Whelan, Anna, de Nys, Rocky, and Paul, Nicholas A. (2017) Slow pyrolysis enhances the recovery and reuse of phosphorus and reduces metal leaching from biosolids. Waste Management, 64. pp. 133-139.

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In this study, biochar is produced from biosolids with and without alum at a range of temperatures and simulated oxidative aging of the biochars is conducted to quantify the long-term leaching of P and metals. While biosolids containing alum had negligible amounts of plant-available P, after pyrolysis >90% of the P became immediately available for plant growth. When biosolids with no alum were converted into biochar there was a small increase in the availability of P but a larger pool was available after oxidation. Both of the biosolids leached significant amounts of metals after oxidation. In contrast, the biochars had a very low available metal content and this did not increase with oxidation, demonstrating a stable metal content. Pyrolysis is an effective waste management strategy for biosolids that can simultaneously reduce the leaching of metals and increase the efficiency of recycling of P for beneficial re-use.

Item ID: 49185
Item Type: Article (Research - C1)
ISSN: 1879-2456
Keywords: biosolids; biochar; phosphorus; metals; pyrolysis
Funders: MBD Research and Development
Date Deposited: 13 Jun 2017 03:31
FoR Codes: 34 CHEMICAL SCIENCES > 3405 Organic chemistry > 340502 Natural products and bioactive compounds @ 80%
40 ENGINEERING > 4004 Chemical engineering > 400410 Wastewater treatment processes @ 20%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 50%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
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