@article{c0faa298d5584dacb34b4c858246b4f6,
title = "Efficient removal of nitrate and arsenic using a two-stage biotic-abiotic treatment system",
abstract = "Nitrate and arsenic often co-exist in groundwater sources. Reverse osmosis, electrodialysis, and ion exchange are the commonly implemented technologies for nitrate removal. Compared to these technologies that generate high-strength waste streams, biological treatment converts nitrate to innocuous nitrogen gas without producing a concentrated waste. When nitrate and arsenic co-exist in a water source, combining a biotic process for nitrate removal with an abiotic process (i.e., chemical–physical process such as coagulation/flocculation) for arsenic removal may provide an effective approach for simultaneous removal of these contaminants. A 12-month pilot study was conducted with a two-stage, fixed-bed biotreatment system, originally developed for nitrate removal, for simultaneous removal of nitrate and arsenic. With an empty bed contact time as low as 10 min in the bioreactor, nitrate was consistently lowered from ~35 mg/L N to <0.1 mg/L N (treatment target was <1 mg/L N), whereas arsenic was effectively lowered from ~14 μg/L to <5 μg/L. Overall, the results demonstrated efficient and resilient simultaneous removal of nitrate and arsenic using a two-stage biotic-abiotic treatment system.",
keywords = "biofilter, bioreactor, biotreatment, simultaneous nitrate and arsenic removal, two-stage biotic/abiotic system",
author = "Giridhar Upadhyaya and Will Raymond and Tatiana Guarin and Wu, {Pei Shin} and John Witter and Jess Brown",
note = "Funding Information: The authors would like to thank The Nevada Center of Excellence in Water (WaterStart) for funding this project. We would also like to thank TMWA for their assistance with the pilot system establishment, troubleshooting, and analytical support. We extend our gratitude to AdEdge Water Technologies for the data review and conceptual design of a potential full‐scale system based on the pilot results and AMS for providing the in‐line analyzer‐associated analytical support. Funding Information: The authors would like to thank The Nevada Center of Excellence in Water (WaterStart) for funding this project. We would also like to thank TMWA for their assistance with the pilot system establishment, troubleshooting, and analytical support. We extend our gratitude to AdEdge Water Technologies for the data review and conceptual design of a potential full-scale system based on the pilot results and AMS for providing the in-line analyzer-associated analytical support. Publisher Copyright: {\textcopyright} 2022 The Authors. AWWA Water Science published by Wiley Periodicals LLC on behalf of American Water Works Association.",
year = "2022",
month = may,
day = "1",
doi = "10.1002/aws2.1292",
language = "Ingl{\'e}s",
volume = "4",
journal = "AWWA Water Science",
issn = "2577-8161",
publisher = "John Wiley and Sons Inc",
number = "3",
}