CaO2/UV Process for One-Step Phosphorus Removal and Recovery from Hypophosphite: Simultaneous Oxidation and Precipitation

Zhang, Shaopeng1; Song, Bingnan1; Wang, Runhua1; Zhan, Zhengshuo1; Saakes, Michel2; Weijden, Renata D. van der; Buisman, Cees J. N.2,3; Lei, Yang1

2023-02-01

10.1021/acsestwater.2c00610

ACS ES&T WATER   影响因子和分区

2690-0637

Hypophosphite (P(I)) is ubiquitous in some waste streams. It may contribute to the eutrophication of water bodies, yet conventional methods are ineffective in treating P(I)-laden wastewater. Here, we propose a novel CaO2/ ultraviolet (UV) system that can simultaneously remove P(I) and recover Ca-phosphate. This system lies in the simultaneous release of OH-, Ca2+, and H2O2, with the last being activated and producing reactive oxygen species (ROS) under UV irradiation. Subsequently, the generated ROS converts P(I) to phosphite and phosphate, forming Ca-phosphate with the released Ca2+ at pH 11.0. Beyond activating H2O2, UV light also promotes the dissolution of CaO2 powders. The system removes 97.0% of 1.0 mM P(I) in 6 h with dosing 2.0 mM CaO2. The presence of 5.0 mM HCO3- drops P(I) removal from 97.0 to 14.1% by competing with P(V) toward Ca2+. Nitrate and humic acid show similar effects by adsorbing UV light or quenching ROS. However, we may overcome the adverse effects with an enhanced CaO2 dose. For example, with 10 mM CaO2, the CaO2/UV system removed more than 78% of non-ortho P from actual electroless rinse water. These results confirmed that CaO2/UV is an exciting all-in-one system for treating P(I)-laden wastewater and recovering valuable P products.

calcium peroxide calcium phosphate phosphorus removal and recovery electroless plating wastewater advanced oxidation process

ESCI

英语

第一 ; 通讯

Stable Support Plan Program of Shenzhen Natural Science Foundation[20220815101937003] ; SUSTech start-up funding[Y01296128]

Environmental Sciences & Ecology ; Water Resources

Environmental Sciences ; Water Resources

WOS:000934687000001

AMER CHEMICAL SOC

Web of Science

1.Southern Univ Sci & Technol SUSTech, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
2.Ctr Excellence Sustainable Water Technol, Wetsus, NL-8900CC Leeuwarden, Netherlands
3.Wageningen Univ & Res, Dept Environm Technol, NL-6700AA Wageningen, Netherlands

Zhang, Shaopeng,Song, Bingnan,Wang, Runhua,et al. CaO2/UV Process for One-Step Phosphorus Removal and Recovery from Hypophosphite: Simultaneous Oxidation and Precipitation[J]. ACS ES&T WATER,2023.

Zhang, Shaopeng.,Song, Bingnan.,Wang, Runhua.,Zhan, Zhengshuo.,Saakes, Michel.,...&Lei, Yang.(2023).CaO2/UV Process for One-Step Phosphorus Removal and Recovery from Hypophosphite: Simultaneous Oxidation and Precipitation.ACS ES&T WATER.

Zhang, Shaopeng,et al."CaO2/UV Process for One-Step Phosphorus Removal and Recovery from Hypophosphite: Simultaneous Oxidation and Precipitation".ACS ES&T WATER (2023).