An alternative approach for nitrate and arsenic removal from wastewater via a nitrate-dependent ferrous oxidation process

Journal of Environmental Management
Meilin ZhangZihao He

Abstract

Owing to the high efficiency of converting nitrate to nitrogen gas with ferrous iron as the electron donor, the process of nitrate-dependent ferrous oxidation (NDFeO) has been considered suitable to treat wastewater that contains nitrate but lacks organic matter. Meanwhile, arsenic immobilization often has been found during the NDFeO reaction. Thus, it was strongly expected that nitrate and arsenic could be removed simultaneously in co-contaminated wastewater through the NDFeO process. However, in the current work, arsenic was not removed during the NDFeO process when the pH was high (above 8), though the nitrate reduction rate was over 90%. Meanwhile, the biosolid particles from the NDFeO process demonstrated strong adsorption ability for arsenic when the pH was below 6. Yet, the adsorption became weak when the pH was above 7. Fourier transform infrared (FTIR) spectroscopy analysis revealed that the main activated component for arsenic adsorption was iron oxide in these particles, which was easily crippled under high pH conditions. These results implied that co-removal of nitrate and arsenic in wastewater treatment using NDFeO was difficult to carry out under high pH conditions. Thus, a two-step approach in which nitrate was r...Continue Reading

Citations

Dec 14, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Donglei WuAqiang Ding
Jul 22, 2019·Environment International·Chenchen QuQiaoyun Huang
Nov 6, 2021·Environmental Science and Pollution Research International·Mohammad Zounemat-KermaniReinhard Hinkelmann

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