Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers
| Autor: | Linzhang Yang, Tao Lyu, Gang Pan, Mick Cooper, Yanfang Feng, Bin Yue, Qingnan Chu, Lihong Xue, Robert J.G. Mortimer, Zhimin Sha |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
020209 energy
Strategy and Management phosphorus use efficiency Amendment chemistry.chemical_element Biomass 02 engineering and technology engineering.material phosphorus fractionation Industrial and Manufacturing Engineering Hydrothermal carbonization chemistry.chemical_compound wheat 0202 electrical engineering electronic engineering information engineering 0505 law General Environmental Science sustainable development Renewable Energy Sustainability and the Environment Chemistry Phosphorus 05 social sciences Building and Construction Pulp and paper industry hydrochar Wastewater Phosphorite microalgae technology 050501 criminology engineering Fertilizer Citric acid |
| ISSN: | 0959-6526 |
| Popis: | 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 1 wt% 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect