Hachicha Rihab, Elleuch Jihen, Dubessay Pascal, Hachicha Ridha, Abdelkafi Slim, Michaud Philippe, Fendri Imen
Clermont Auvergne University, Clermont Auvergne INP, CNRS, Institut Pascal, 63000, Clermont-Ferrand, France.
Laboratory of Plant Biotechnologies Applied to Crop Improvement, Faculty of Sciences of Sfax, University of Sfax, 3038, Sfax, Tunisia.
Int Microbiol. 2024 Oct 2. doi: 10.1007/s10123-024-00600-z.
The olive oil industry generates 30 million cubic meters of olive mill wastewaters (OMWWs) annually. OMWWs are a major environmental concern in the Mediterranean region due to their high organic matter content, suspended solids, unpleasant odor, and dark color. The application of primary treatments such as coagulation-flocculation, adsorption, and hybrid systems combining coagulation-flocculation with adsorption has enabled to remove part of the organic matter, color, turbidity, and growth-inhibiting compounds from OMWWs. Among these methods, the hybrid system combining activated carbon and chitosan has proven to be the best removal efficiency. Subsequently, secondary treatment involving the cultivation of Chlorella sp. on OMWWs pretreated with chitosan achieved the highest maximal specific growth rate (0.513 ± 0.022 day⁻) and biomass productivity (0.621 ± 0.021 g/L/day). Notably, the fatty acids (FA) profile produced by Chlorella sp. cells grown under these conditions differed, underscoring the potential of OMWWs as a microalgal growth medium. This innovative approach not only addresses environmental issues but also opens new avenues for sustainable bioproducts.
橄榄油产业每年产生3000万立方米的橄榄油厂废水（OMWWs）。由于其高有机物含量、悬浮固体、难闻气味和深色，OMWWs是地中海地区主要的环境问题。采用诸如混凝-絮凝、吸附以及混凝-絮凝与吸附相结合的混合系统等初级处理方法，能够去除OMWWs中的部分有机物、颜色、浊度和生长抑制化合物。在这些方法中，活性炭与壳聚糖相结合的混合系统已被证明具有最佳的去除效率。随后，二级处理是在经壳聚糖预处理的OMWWs上培养小球藻，其达到了最高的最大比生长速率（0.513±0.022天⁻¹）和生物量生产力（0.621±0.021克/升/天）。值得注意的是，在这些条件下生长的小球藻细胞产生的脂肪酸（FA）谱有所不同，这突出了OMWWs作为微藻生长培养基的潜力。这种创新方法不仅解决了环境问题，还为可持续生物产品开辟了新途径。
