Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers
作者： Qingnan Chu , Tao Lyu , Lihong Xue , Linzhang Yang , Yanfang Feng
DOI: 10.1016/J.JCLEPRO.2020.124627
关键词:
摘要: Abstract Due to the finite stocks of phosphate rock and low phosphorus (P) use efficiency (PUE) traditional mineral P fertilizers, more sustainable alternatives are desirable. One possibility is culture microalgae in wastewater recover then convert biomass into slow-release fertilizers through hydrothermal carbonization (HTC). Therefore, this study aimed recycle from agricultural field using HTC technology. Chlorella vulgaris (CV) Microcystis sp. (MS) were cultured poultry farm with an initial concentration 41.3 mg P kg−1. MS removed 88.4% wastewater, which was superior CV. CV- MS-derived hydrochars produced at 200 or 260 °C, solutions deionized water 1 wt% citric acid. The hydrochar acid solution 260 °C (MSHCA260) recovered highest amount (91.5%) after HTC. charring promoted transformation soluble exchangeable moderately available (Fe/Al-bound P), as feedwater increased recovery rate formation Fe/Al-bound P. With abundant pool, amendment released slowly enhanced soil availability persistently than chemical fertilizer did, helped improve PUE. In a wheat-cultivation pot experiment, MSHCA260 treatment improved wheat PUE by 34.4% yield 21.6% did. These results provide novel strategy for recycling crop-soil systems, substituting fertilizer, improving plant
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