Tags

Type your tag names separated by a space and hit enter

A simple treatment method for phenylarsenic compounds: Oxidation by ferrate (VI) and simultaneous removal of the arsenate released with in situ formed Fe(III) oxide-hydroxide.
Environ Int. 2019 06; 127:730-741.EI

Abstract

p-Arsanilic acid (p-ASA) and roxarsone (ROX) are two major phenylarsenic feed additives that are still widely used in many countries, and the land application of animal waste containing these compounds could introduce large quantities of arsenic into the environment. In this study, we proposed a treatment scheme for animal waste that involves leaching of p-ASA/ROX out of the manure first by water, then oxidation by ferrate (Fe(VI)) and removal of the arsenate released by in situ formed Fe(III) oxide-hydroxide. The effects of solution pH, dosage of Fe(VI), solution ionic strength, and matrix species on the treatment performance were systematically evaluated. Initial solution pH values of 4.1 and 2.0 were chosen for the oxidation of p-ASA and ROX, respectively, while efficient arsenate removal could be achieved with relatively small adjustment of the final solution pH (to 4.0). The pH-dependent second-order rate constants for the reactions between ferrate and p-ASA and ROX over the pH range of 2.0-12.0 were estimated to be 7.13 × 105-2.01 × 10-1 and 8.91 × 103-1.65 × 10-1 M-1 s-1, respectively. The degradation pathways of p-ASA/ROX during ferrate oxidation were proposed based on the inorganic and organic intermediates identified. Depending on the levels of p-ASA/ROX, effective treatment could be achieved through flexible adjustment of the Fe(VI) dosage. p-ASA/ROX (10 mg-As/L) in swine manure leachate could be efficiently treated by ferrate oxidation within 5 min, with the overall arsenic removal efficiency higher than 99.2%. The treatment performance was barely affected by the presence of common ions (K+, Ca2+, Na+, Mg2+, SO42-, NO3-, and Cl-), while humic acid, Mn2+, Ni2+, Fe3+, and Co2+ inhibited p-ASA/ROX oxidation. The presence of PO43- and NH4+ could accelerate the oxidation of p-ASA/ROX, but PO43- and humic acid compromised sorptive removal of the released arsenate due to their competitive sorption on the Fe(III) oxide-hydroxide precipitate. Ferrate oxidation is green and fast, and the operation is simple, thus it could serve as a promising and environment-friendly option for mitigating the risk of phenylarsenic feed additives in animal waste.

Authors+Show Affiliations

MOE Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.MOE Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China. Electronic address: hefac@umich.edu.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

31003056

Citation

Xie, Xiande, and Hefa Cheng. "A Simple Treatment Method for Phenylarsenic Compounds: Oxidation By Ferrate (VI) and Simultaneous Removal of the Arsenate Released With in Situ Formed Fe(III) Oxide-hydroxide." Environment International, vol. 127, 2019, pp. 730-741.
Xie X, Cheng H. A simple treatment method for phenylarsenic compounds: Oxidation by ferrate (VI) and simultaneous removal of the arsenate released with in situ formed Fe(III) oxide-hydroxide. Environ Int. 2019;127:730-741.
Xie, X., & Cheng, H. (2019). A simple treatment method for phenylarsenic compounds: Oxidation by ferrate (VI) and simultaneous removal of the arsenate released with in situ formed Fe(III) oxide-hydroxide. Environment International, 127, 730-741. https://doi.org/10.1016/j.envint.2019.03.059
Xie X, Cheng H. A Simple Treatment Method for Phenylarsenic Compounds: Oxidation By Ferrate (VI) and Simultaneous Removal of the Arsenate Released With in Situ Formed Fe(III) Oxide-hydroxide. Environ Int. 2019;127:730-741. PubMed PMID: 31003056.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A simple treatment method for phenylarsenic compounds: Oxidation by ferrate (VI) and simultaneous removal of the arsenate released with in situ formed Fe(III) oxide-hydroxide. AU - Xie,Xiande, AU - Cheng,Hefa, Y1 - 2019/04/16/ PY - 2018/11/30/received PY - 2019/03/22/revised PY - 2019/03/25/accepted PY - 2019/4/20/pubmed PY - 2019/11/19/medline PY - 2019/4/20/entrez KW - Arsenate KW - Fe(III) oxide-hydroxide KW - Ferrate oxidation KW - Manure leachate treatment KW - Phenylarsenic compounds KW - Sorption SP - 730 EP - 741 JF - Environment international JO - Environ Int VL - 127 N2 - p-Arsanilic acid (p-ASA) and roxarsone (ROX) are two major phenylarsenic feed additives that are still widely used in many countries, and the land application of animal waste containing these compounds could introduce large quantities of arsenic into the environment. In this study, we proposed a treatment scheme for animal waste that involves leaching of p-ASA/ROX out of the manure first by water, then oxidation by ferrate (Fe(VI)) and removal of the arsenate released by in situ formed Fe(III) oxide-hydroxide. The effects of solution pH, dosage of Fe(VI), solution ionic strength, and matrix species on the treatment performance were systematically evaluated. Initial solution pH values of 4.1 and 2.0 were chosen for the oxidation of p-ASA and ROX, respectively, while efficient arsenate removal could be achieved with relatively small adjustment of the final solution pH (to 4.0). The pH-dependent second-order rate constants for the reactions between ferrate and p-ASA and ROX over the pH range of 2.0-12.0 were estimated to be 7.13 × 105-2.01 × 10-1 and 8.91 × 103-1.65 × 10-1 M-1 s-1, respectively. The degradation pathways of p-ASA/ROX during ferrate oxidation were proposed based on the inorganic and organic intermediates identified. Depending on the levels of p-ASA/ROX, effective treatment could be achieved through flexible adjustment of the Fe(VI) dosage. p-ASA/ROX (10 mg-As/L) in swine manure leachate could be efficiently treated by ferrate oxidation within 5 min, with the overall arsenic removal efficiency higher than 99.2%. The treatment performance was barely affected by the presence of common ions (K+, Ca2+, Na+, Mg2+, SO42-, NO3-, and Cl-), while humic acid, Mn2+, Ni2+, Fe3+, and Co2+ inhibited p-ASA/ROX oxidation. The presence of PO43- and NH4+ could accelerate the oxidation of p-ASA/ROX, but PO43- and humic acid compromised sorptive removal of the released arsenate due to their competitive sorption on the Fe(III) oxide-hydroxide precipitate. Ferrate oxidation is green and fast, and the operation is simple, thus it could serve as a promising and environment-friendly option for mitigating the risk of phenylarsenic feed additives in animal waste. SN - 1873-6750 UR - https://www.unboundmedicine.com/medline/citation/31003056/A_simple_treatment_method_for_phenylarsenic_compounds:_Oxidation_by_ferrate__VI__and_simultaneous_removal_of_the_arsenate_released_with_in_situ_formed_Fe_III__oxide_hydroxide_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0160-4120(18)32929-5 DB - PRIME DP - Unbound Medicine ER -