Flow-through electrochemical organophosphorus degradation and phosphorus recovery: The essential role of chlorine radical

Tian，Fengguo1; Qiao，Jianzhi1; Zheng，Wentian1; Lei，Yang2; Jiang，Shengtao3; Liu，Yanbiao1

2023-11-01

10.1016/j.envres.2023.116867

Environmental Research   Impact Factor & Quartile

0013-9351

1096-0953

Phosphorus scarcity and the deleterious ecological impact of the release of organophosphorus pesticides have emerged as critical global issues. Previous research has shown the ability of electrochemistry to induce the precipitation of calcium phosphate from phosphorus-laden wastewater to recover the phosphorus. The current study presents a flow-through electrochemical system consisting of a column-shaped electrochemical reactor, a tubular stainless-steel (SS) cathode, and a titanium suboxides (TiSO) anode. This system simultaneously oxidizes tetrakis (hydroxymethyl) phosphonium sulfate (THPS) and recycles phosphates. The influence of current density, flow rate, and initial calcium ions concentration were examined under continuous flow operation. To enhance the electrochemical reactor's performance, we elevated the current density from 5 to 30 mA cm, which caused the phosphorus recovery efficiency to increase from 37% to 72% within 120 min, accompanied by an enhancement of the THPS mineralization efficiency from 57% to 90%. These improvements were likely due to the higher yield of reactive species chloride species (Cl) formed at the TiSO anode and the higher local pH at the cathode. By investigating the formation of Cl at the TiSO anode, we found that THPS mineralization exceeded 75% in the presence of NaCl at a current density of 20 mA cm. The demonstrated performance of the flow-through electrochemical system should enable the utilization of anodic oxidation-cathodic precipitation for the recovery of phosphorus from organophosphorus-contaminated wastewater.

Calcium phosphate Electrochemical oxidation Magnéli-phase titanium suboxides electrode Organophosphorus pesticide

SCI

English

Others

Fundamental Research Funds for the Central Universities["2232023A-08","2232022G-11"] ; Natural Science Foundation of Shanghai[23ZR1401300] ; National Nat- ural Science Foundation of China["52170068","U21A20161"]

Environmental Sciences & Ecology ; Public, Environmental & Occupational Health

Environmental Sciences ; Public, Environmental & Occupational Health

WOS:001069593400001

ACADEMIC PRESS INC ELSEVIER SCIENCE

ENVIRONMENT/ECOLOGY

2-s2.0-85167625320

Scopus

1.College of Environmental Science and Engineering,Donghua University,Shanghai,2999 North Renmin Road,201620,China
2.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.College of Life Science,Taizhou University,Taizhou,318000,China

Tian，Fengguo,Qiao，Jianzhi,Zheng，Wentian,et al. Flow-through electrochemical organophosphorus degradation and phosphorus recovery: The essential role of chlorine radical[J]. Environmental Research,2023,236.

Tian，Fengguo,Qiao，Jianzhi,Zheng，Wentian,Lei，Yang,Jiang，Shengtao,&Liu，Yanbiao.(2023).Flow-through electrochemical organophosphorus degradation and phosphorus recovery: The essential role of chlorine radical.Environmental Research,236.

Tian，Fengguo,et al."Flow-through electrochemical organophosphorus degradation and phosphorus recovery: The essential role of chlorine radical".Environmental Research 236(2023).