文献类型：期刊文献

英文题名：Phytohormone Supplementation for Nutrient Removal from Mariculture Wastewater by Oocystis borgei in Sequential Batch Operation

作者：Liu, Yang[1];Deng, Chengcheng[1];Song, Xinyue[1];Hu, Zhangxi[1];Li, Feng[1];Zhang, Yulei[1];Li, Changling[1];Huang, Xianghu[1];Zhang, Ning[1]

机构：[1]Guangdong Ocean Univ, Fisheries Coll, Lab Algae Resource Dev & Aquaculture Environm Ecol, Zhanjiang 524088, Peoples R China

年份：2024

卷号：16

期号：4

外文期刊名：WATER

收录：SCI-EXPANDED(收录号：WOS:001175894900001)、、EI(收录号：20240915630144)、Scopus(收录号：2-s2.0-85185724578)、WOS

基金：No Statement Available

语种：英文

外文关键词：Oocystis borgei; phytohormone; mariculture wastewater; nitrogen metabolism; antioxidant system

外文摘要：To enhance the nutrient removal efficiency of Oocystis borgei for mariculture wastewater (MW), the effects and processes of three phytohormones on nitrogen and phosphorus removal from synthetic mariculture wastewater (SMW) by O. borgei under sequential batch operation were compared. The findings revealed that the supplementation with 10(-6) M 3-indoleacetic acid (IAA), gibberellic acid (GA3), and zeatin (ZT) resulted in the most effective elimination, while there was no appreciable difference among them. The nitrogen and phosphorus indices of the effluent dramatically reduced (p < 0.01) upon the supplementation of phytohormones, and the removal effects were ranked as NO3--N > PO43--P > NH4+-N > NO2--N. The removal rates for NH4+-N and PO43--P were 0.72-0.74 mgL-1d(-1) and 1.26-1.30 mgL-1d(-1), respectively. According to physiological studies, phytohormones enhanced the levels of photosynthetic pigments and chlorophyll fluorescence parameters (Fv/Fm and phi PSII), thereby improving photosynthetic activity. Additionally, they stimulated Nitrate Reductase (NR) and Glutamine Synthetase (GS) activities to promote nitrogen metabolism and increased Superoxide Dismutase (SOD), Catalase (CAT), and carotenoid contents to mitigate oxidative stress damage caused by abiotic stress. These activities contribute to the proliferation of O. borgei, which in turn resulted in an increase in the assimilation of nitrogen and phosphorus from SMW. In conclusion, phytohormone supplementation significantly increased nutrient removal from SMW by O. borgei in a sequential batch reactor, which has potential application in MW treatment.