4.7 Article

Can microalgae grown in wastewater reduce the use of inorganic fertilizers?

期刊

JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 323, 期 -, 页码 -

出版社

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2022.116224

关键词

Water; Biofertilizer; Algal biomass; Circular bioeconomy; Agronomic tests; Resource recovery

资金

  1. European Commission [FER- TILWASTES-EFA307/19]
  2. Spanish Ministry of Science and Innovation [CYRCLE-PID2020-113866RA-I00]
  3. Spanish Ministry of Industry and Economy [RYC2018-025514, IJC2019- 042069-I]

向作者/读者索取更多资源

This study evaluated the use of microalgal biomass produced during domestic wastewater treatment as a biofertilizer in basil crops. The results showed that combining microalgae with inorganic fertilizer can provide comparable plant growth to conventional fertilizers, with higher leaf dry weight.
Alternatives to conventional inorganic fertilizers are needed to cope with the growing global population and contamination due to the production and use of those inorganic compounds. The recovery of nutrients from wastewater and organic wastes is a promising option to provide fertilization in a circular economy approach. In this context, microalgae-based systems are an alternative to conventional wastewater treatment systems, reducing the treatment costs and improving the sustainability of the process, while producing nutrient-rich microalgal biomass. The aim of the present study is to evaluate the use of microalgal biomass produced during domestic wastewater treatment in high rate algal ponds as a biofertilizer in basil crops (Ocimum basilicum L.). Wastewater was successfully treated, with removal efficiencies in the secondary treatment of 69, 91 and 81% in terms of chemical oxygen demand (COD), total inorganic nitrogen (TIN) and phosphates (PO43-P), respectively. The microalgal biomass, composed mainly by Scenedesmus, presented the following composition: 12% of dry weight and nutrients concentration of 7.6% nitrogen (N), 1.6% phosphorus (P) and 0.9% potassium (K). The study compared the performance of 3 different fertilizers: 1) microalgae fertilizer (MF), 2) inorganic fertilizer (IF) as positive control and 3) the combination of both microalgae and inorganic fertilizer (MF + IF). Comparable plant growth (i.e., number of leaves, shoot fresh and dry weight and leaf fresh weight) was observed among treatments, except for leaf dry weight, which was significantly higher in the IF + MF and MF treatments (28 and 27%, respectively) in comparison with the control. However, the microalgae treatment provided the lowest chlorophyll, N and K leaf content. In conclusion, this study suggests that combining microalgae grown in wastewater with an inorganic fertilizer is a promising nutrients source for basil crops, enhancing the circular bioeconomy.

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