期刊
ACS ES&T ENGINEERING
卷 1, 期 11, 页码 1553-1564出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsestengg.1c00204
关键词
Hydrogel; Calcium Phosphate; Calcium Silicate Hydrate; Calcium Alginate; Mineral Growth
资金
- United States Environmental Protection Agency [84008401]
- National Science Foundation Graduate Research Fellowship Program [DGE-1745038]
- DOE Office of Science [DEAC02-06CH11357]
Developing novel mineral-hydrogel composites for effectively recovering phosphate from wastewater has shown promising results in increasing phosphate removal rate, reducing the required initial amounts of Ca and P materials for synthesis, and demonstrating the potential to remove phosphate even under CaP undersaturated conditions. This method presents itself as a widely applicable and environmentally sustainable treatment and recovery method for nutrient-rich wastewater.
Effectively recovering phosphate from wastewater streams and reutilizing it as a nutrient will critically support sustainability. Here, to capture aqueous phosphate, we developed novel mineral-hydrogel composites composed of calcium alginate, calcium phosphate (CaP), and calcium silicate hydrate (CSH) (CaP + CSH/Ca-Alg). The CaP + CSH/Ca-Alg composites were synthesized by dripping a sodium alginate (Na-Alg) solution with ionic precursors into a calcium chloride bath. To change the mineral seed's properties, we varied the calcium bath concentrations and the ionic precursor (sodium dibasic phosphate (NaH2PO4) and/or sodium silicate (Na2SiO3)) amounts and their ratios. The added CSH in the mineral-hydrogel composites resulted in the release of calcium and silicate ions in phosphate-rich solutions, increasing the saturation ratio with respect to calcium phosphate within the mineral-hydrogel composites. The CSH addition to the mineral-hydrogel composites doubled the phosphate removal rate while requiring lesser initial amounts of Ca and P materials for synthesis. By incorporating both CSH and CaP mineral seeds in composites, we achieved a final concentration of 0.25 mg-P/L from an initial 6.20 mg-P/L. Moreover, the mineral-hydrogel composites can remove phosphate even under CaP undersaturated conditions. This suggests their potential to be a widely applicable and environmentally sustainable treatment and recovery method for nutrient-rich wastewater.
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