Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers

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dc.contributor.author Chu, Qingnan
dc.contributor.author Lyu, Tao
dc.contributor.author Xue, Lihong
dc.contributor.author Yang, Linzhang
dc.contributor.author Feng, Yanfang
dc.contributor.author Sha, Zhimin
dc.contributor.author Yue, Bin
dc.contributor.author Mortimer, Robert J.G.
dc.contributor.author Cooper, Mick
dc.contributor.author Pan, Gang
dc.date.accessioned 2020-10-16T14:57:28Z
dc.date.available 2020-10-16T14:57:28Z
dc.date.issued 2020-10-12
dc.identifier.citation Chu Q, Lyu T, Xue L, et al., (2020) Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers. Journal of Cleaner Production, Available online 12 October 2020, Article number 124627. en_UK
dc.identifier.issn 0959-6526
dc.identifier.uri https://doi.org/10.1016/j.jclepro.2020.124627
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/15895
dc.description.abstract Due to the finite stocks of phosphate rock and low phosphorus (P) use efficiency (PUE) of traditional mineral P fertilizers, more sustainable alternatives are desirable. One possibility is to culture microalgae in wastewater to recover the P and then convert the microalgae biomass into slow-release fertilizers through hydrothermal carbonization (HTC). Therefore, this study aimed to recycle P from wastewater to agricultural field using microalgae and HTC technology. Chlorella vulgaris (CV) and Microcystis sp. (MS) were cultured in poultry farm wastewater with an initial concentration of 41.3 mg P kg-1. MS removed 88.4% P from the wastewater, which was superior to CV. CV- and MS-derived hydrochars were produced at 200 or 260°C, in solutions using deionized water or 1wt% citric acid. The MS-derived hydrochar using 1 wt% citric acid solution at 260 °C (MSHCA260) recovered the highest amount of P (91.5%) after HTC. The charring promoted the transformation of soluble and exchangeable P into moderately available P (Fe/Al-bound P), and using citric acid solution as feedwater increased the P recovery rate and formation of Fe/Al-bound P. With the abundant moderately available P pool, hydrochar amendment released P more slowly and enhanced the soil P availability more persistently than chemical fertilizer did, which helped to improve PUE. In a wheat-cultivation pot experiment, MSHCA260 treatment improved wheat PUE by 34.4% and yield by 21.6% more than chemical fertilizer did. These results provide a novel sustainable strategy for recycling P from wastewater to crop-soil systems, substituting the mineral P fertilizer, and improving plant PUE. en_UK
dc.language.iso en en_UK
dc.publisher Elsevier en_UK
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/ *
dc.subject wheat en_UK
dc.subject sustainable development en_UK
dc.subject phosphorus use efficiency en_UK
dc.subject phosphorus fractionation en_UK
dc.subject microalgae technology en_UK
dc.subject hydrochar en_UK
dc.title Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers en_UK
dc.type Article en_UK


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