Self-driven phosphate enrichment by hydrogel beads for nutrient recovery  

作　　者：Zeou Dou Yixuan Huang Xing Xie 

机构地区：[1]School of Civil and Environmental Engineering,Georgia Institute of Technology,Atlanta,GA 30332,USA

出　　处：《Frontiers of Environmental Science & Engineering》2025年第1期87-96,共10页环境科学与工程前沿(英文)

基　　金：Mourin Jarin for polishing the English writing of this paper.Yixuan Huang is grateful for the financial support provided by the China Scholarship Council(No.202308010002).

摘　　要：The enrichment of phosphate is necessary for high-efficiency nutrient recovery from wastewater through struvite precipitation.However,the majority of current nutrient enrichment processes focus on membrane-based technologies driven by external energy input.Here,the phosphate enrichment by negatively charged Poly(sodium acrylate)hydrogel beads as the self-driven dewatering agent under different conditions was investigated.The phosphate rejection decreased as its concentration increased but retained 56.9%even in 10 mmol/L PO_(4)^(3−)solution,which is well beyond the phosphate concentration in typical wastewater concentrates.Phosphate was concentrated 3.6 folds with a recovery of 70%using~1 wt%of hydrogel beads in 0.5 mmol/L phosphate solution.The effects of the pH,ionic strength of the nutrient stream,and the swelling ratio of hydrogels on the rejection of phosphate were investigated.In addition,the hydrogel beads removed 100%of nickel ions during the dewatering of the phosphate solution(0.5 mmol/L Ni2+and 0.5 mmol/L PO_(4)^(3−)),presenting an opportunity for simultaneous phosphate enrichment and purification during the pretreatment for nutrient recovery from wastewater.This study demonstrated that the spontaneous dewatering process utilizing ion-selective hydrogels is promising for nutrient enrichment to promote recovery efficiency.

关 键 词：Nutrient recovery HYDROGEL Ion selectivity PHOSPHATE SEPARATION 

分 类 号：O63[理学—高分子化学]