Efficient Treatment of Phosphonate-Laden Wastewater by CaO₂/UV: Partial Oxidation, Complexation, and Coprecipitation

Zhang, Shaopeng1; Song, Bingnan1; Zhan, Zhengshuo1; Liu, Yanbiao2; Zhao, Xu3; Sheng, Guo-Ping4; Lei, Yang1

2024-03-06

10.1021/acsestwater.3c00699

ACS ES&T WATER   影响因子和分区

2690-0637

Unlike the case for inorganic phosphate (Pi), removing organic phosphorus (P-o) is more challenging. Conventional methods for removing P-o involve a two-step route, where P-o is first converted to Pi by an advanced oxidation process, followed by subsequent chemical precipitation/coagulation. Here, we propose a one-step CaO2/UV method for simultaneous conversion and coprecipitation of phosphonates, a representative type of organic phosphorus compound. We discovered that the total P removal (82.0%) is much higher than the conversion efficiency of P-o to Pi (26.7%) under a dose of 1.5 mM CaO2 and 4 h UV irradiation for nitrilotris-methylene phosphonic acid (NTMP) treatment, providing new directions for treating P-o compounds without completely breaking down the molecular structure. We further found that a CaO2/P-o molar ratio of 1.5 is ideal for inducing the partial breakdown of the NTMP structure, Ca-phosphate formation, and coprecipitation of NTMP and its degradation intermediates. Beyond that, we noted that the presence of Ca2+ enhances the reactivity of NTMP with hydroxyl radicals, as supported by the improved conversion efficiency of P-o to Pi, i.e., 37.4% vs 9.1% under pH i 11. We also demonstrated the preliminary feasibility of the CaO2/UV system in treating the reverse osmosis concentrate. Our study offers a robust one-step approach and sheds new insights on the synergistic role of partial oxidation, complexation, and coprecipitation in dealing with phosphonate-laden wastewater.

organic phosphorus advanced oxidation phosphorusrecovery Ca-phosphate pH

ESCI

英语

第一 ; 通讯

Guangdong Provincial Introduction of Innovative Research and Development Team["JCYJ20230807093405011","20220815101937003"] ; Shenzhen Science and Technology Program[2017ZT07Z479] ; Program for Guangdong Introducing Innovative and Entrepreneurial Teams[ZDSYS20220606100604008]

Environmental Sciences & Ecology ; Water Resources

Environmental Sciences ; Water Resources

WOS:001180780700001

AMER CHEMICAL SOC

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen Key Lab Precis Measurement & Early Warnin, Shenzhen 518055, Peoples R China
2.Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
4.Univ Sci & Technol China, Dept Environm Sci & Engn, CAS Key Lab Urban Pollutant Convers, Hefei 230026, Peoples R China

Zhang, Shaopeng,Song, Bingnan,Zhan, Zhengshuo,et al. Efficient Treatment of Phosphonate-Laden Wastewater by CaO₂/UV: Partial Oxidation, Complexation, and Coprecipitation[J]. ACS ES&T WATER,2024,4(4).

Zhang, Shaopeng.,Song, Bingnan.,Zhan, Zhengshuo.,Liu, Yanbiao.,Zhao, Xu.,...&Lei, Yang.(2024).Efficient Treatment of Phosphonate-Laden Wastewater by CaO₂/UV: Partial Oxidation, Complexation, and Coprecipitation.ACS ES&T WATER,4(4).

Zhang, Shaopeng,et al."Efficient Treatment of Phosphonate-Laden Wastewater by CaO₂/UV: Partial Oxidation, Complexation, and Coprecipitation".ACS ES&T WATER 4.4(2024).