Laboratory of Wastewater Management and Treatment Technologies, Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67132 Xanthi, Greece.
Laboratory of Wastewater Management and Treatment Technologies, Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67132 Xanthi, Greece.
Bioresour Technol. 2021 Apr;325:124694. doi: 10.1016/j.biortech.2021.124694. Epub 2021 Jan 11.
Although caper processing wastewaters (CPW) are characterized by high organic content and salt concentration, no attempt has been made to treat these effluents. In this study, an immobilized cell bioreactor efficiently treated CPW even at hypersaline conditions (100 g/L salinity). Nitrogen was mainly assimilated during biotreatment, as nitrification was inhibited at elevated salinities. The hydrolytic potential was assessed by determining glucanase, xylanase, glucosidase, lipase and protease activities, which were negatively affected above 20 g/L salinity as the consequence of the inhibition of non-halotolerant microbiota. Succession of non-halotolerant taxa by the slightly halotolerant bacteria Defluviimonas, Amaricoccus, Arenibacter, Formosa and Muricauda, and then by the moderately/extremely halotolerant genera Halomonas, Roseovarius and Idiomarina occurred over salinity increase. Diversity indices were reduced during transition from moderately saline to hypersaline conditions. A distinct network was formed at hypersaline conditions, consisting of the halotolerant genera Halomonas, Idiomarina, Saliterribacillus and Gracilibacillus.
尽管刺山柑加工废水中（CPW）具有高有机物含量和盐浓度的特点，但尚未尝试对这些废水进行处理。在这项研究中，固定化细胞生物反应器即使在高盐条件（100g/L 盐度）下也能有效地处理 CPW。氮主要在生物处理过程中被同化，因为硝化作用在高盐度下受到抑制。通过测定葡聚糖酶、木聚糖酶、葡萄糖苷酶、脂肪酶和蛋白酶活性来评估水解潜力，当盐度超过 20g/L 时，由于非耐盐微生物群的抑制，这些酶活性受到负面影响。随着盐度的升高，非耐盐类群被耐盐性略低的细菌 Defluviimonas、Amaricoccus、Arenibacter、Formosa 和 Muricauda 取代，然后是中度/高度耐盐属 Halomonas、Roseovarius 和 Idiomarina。在从中等盐度到高盐度的过渡过程中，多样性指数降低。在高盐度条件下形成了一个独特的网络，其中包含耐盐属 Halomonas、Idiomarina、Saliterribacillus 和 Gracilibacillus。
