Highly efficient and selective removal of phosphate from wastewater of sea cucumber aquaculture for microalgae culture using a new adsorption-membrane separation-coordinated strategy

作     者：Aihua Zhang Shihao Fang Huan Xi Jianke Huang Yongfu Li Guangyuan Ma Jianfeng Zhang Aihua Zhang;Shihao Fang;Huan Xi;Jianke Huang;Yongfu Li;Guangyuan Ma;Jianfeng Zhang

作者机构：Jiangsu Province Engineering Research Center for Marine Bio-resources Sustainable UtilizationCollege of OceanographyHohai UniversityNanjing 210098China College of Mechanics and MaterialsHohai UniversityNanjing 211100China Jiangsu Innovation Center of Marine BioresourcesJiangsu Coast Development Group Co.Ltd.Nanjing 210019China 

出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)

年 卷 期：2023年第17卷第10期

页      面：27-39页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：This work was successively financed by the Jiangsu Innovation Center of Marine Bioresources(China)(No.822153216) 

主　　题：Adsorption-membrane Low-concentration phosphate Zr-modified-bentonite Recycle Microalgal culture 

摘      要：Enhanced phosphorus treatment and recovery has been continuously pursued due to the stringent wastewater discharge regulations and a phosphate supply shortage. Here, a new adsorption-membrane separation strategy was developed for rational reutilization of phosphate from sea cucumber aquaculture wastewater using a Zr-modified-bentonite filled polyvinyl chloride membrane. The as-obtained polyvinyl chloride/Zr-modified-bentonite membrane was highly permeability (940 L/(m2·h)), 1–2 times higher than those reported in other studies, and its adsorption capacity was high (20.6 mg/g) when the phosphate concentration in water was low (5 mg/L). It remained stable under various conditions, such as different pH, initial phosphate concentrations, and the presence of different ions after 24 h of adsorption in a cross-flow filtration system. The total phosphorus and phosphate removal rate reached 91.5% and 95.9%, respectively, after the membrane was used to treat sea cucumber aquaculture wastewater for 24 h and no other water quality parameters had been changed. After the purification process, the utilization of the membrane as a new source of phosphorus in the phosphorus-free f/2 medium experiments indicated the high cultivability of economic microalgae Phaeodactylum tricornutum FACHB-863 and 1.2 times more chlorophyll a was present than in f/2 medium. The biomass and lipid content of the microalgae in the two different media were similar. The innovative polyvinyl chloride/Zr-modified-bentonite membrane used for phosphorus removal and recovery is an important instrument to establish the groundwork for both the treatment of low concentration phosphate from wastewater as well as the reuse of enriched phosphorus in required fields.