Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers
Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers
复制标题
微藻的水热碳化，将废水中的磷回收到作物-土壤系统中作为缓释肥料
DOI：
10.1016/j.jclepro.2020.124627
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发表时间：
2021-01-04
影响因子：
11.1
通讯作者：
Pan, Gang
中科院分区：
文献类型：
--
作者：
Chu, Qingnan;Lyu, Tao;Pan, Gang
由于磷矿储量有限，传统矿质磷肥的磷利用率较低，需要更可持续的替代方案。一种可能是在废水中培养微藻回收磷，然后通过水热碳化（HTC）将微藻生物质转化为缓释肥料。因此，本研究旨在利用微藻和HTC技术将废水中的磷回收到农田中。在家禽养殖场废水中培养普通小球藻（CV）和微囊藻（MS），初始浓度为41.3 mg P kg（-1）。MS对废水中磷的去除率为88.4%，优于CV。CV-和ms衍生的碳氢化合物在200或260摄氏度下，在使用去离子水或1wt %柠檬酸的溶液中生产。在260℃下使用1wt %柠檬酸溶液（MSHCA260）的质谱衍生碳氢化合物（MSHCA260）在HTC后的P回收率最高（91.5%）。炭化促进了可溶性和交换性磷向中等有效磷（Fe/Albound P）的转化，柠檬酸溶液作为给水提高了磷的回收率和Fe/Al-bound P的形成。由于中等有效磷库丰富，与化肥相比，氢炭改进剂释放磷的速度更慢，土壤磷有效度的提高更持久，有助于提高PUE。在小麦盆栽试验中，MSHCA260处理小麦PUE比化肥处理提高34.4%，产量提高21.6%。这些结果为从废水中回收磷到作物-土壤系统，替代矿质磷肥和提高植物PUE提供了一种新的可持续策略。(C) 2020 Elsevier Ltd.版权所有。
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.