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

JOURNAL OF CLEANER PRODUCTION

卷:283

Article

Chu, Qingnan^1,2  Lyu, Tao^2,3  Xue, Lihong^1,4  Yang, Linzhang¹  Feng, Yanfang^1,4  Sha, Zhimin⁵  Yue, Bin⁶  Mortimer, Robert J. G.²  Cooper, Mick²  Pan, Gang² 

[1] Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agroenvironm Downstream Yangtze Plain, Minist Agr & Rural Affairs, Nanjing 210014, Peoples R China

[2] Nottingham Trent Univ, Sch Anim Rural & Environm Sci, Brackenhurst Campus, Brackenhurst NG25 0QF, Notts, England

[3] Cranfield Univ, Cranfield Water Sci Inst, Coll Rd, Cranfield MK43 0AL, Beds, England

[4] Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212001, Jiangsu, Peoples R China

[5] Shanghai Jiao Tong Univ, Grad Sch Agr & Biol, Shanghai 200240, Peoples R China

[6] Lanzhou City Univ, Coll Geog & Environm Engn, Lanzhou 730070, Gansu, Peoples R China

关键词: Hydrochar;    Microalgae technology;    Phosphorus fractionation;    Phosphorus use efficiency;    Sustainable development;    Wheat;   

DOI  :  10.1016/j.jclepro.2020.124627

来源: Elsevier

【 摘 要 】

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 degrees C, in solutions using deionized water or 1 wt% citric acid. The MS-derived hydrochar using 1 wt% citric acid solution at 260 degrees 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/Albound 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. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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