Assessment of a wastewater stabilization pond system for removal of arsenic, iron, and ammonia from reverse osmosis water treatment plant residual wastewater

Autor:	Mohsen Asadi, Harrison Bull, Ali Ekhlasi Nia, Kerry N. McPhedran
Rok vydání:	2022
Předmět:	Stabilization pond chemistry.chemical_element Contamination Ammonia chemistry.chemical_compound chemistry Wastewater Environmental chemistry Environmental science Water treatment Metalloid Reverse osmosis Arsenic General Environmental Science Civil and Structural Engineering
Zdroj:	Canadian Journal of Civil Engineering. 49:1026-1039
ISSN:	1208-6029 0315-1468
Popis:	Drinking water treatment plants (DWTPs) produce wastewaters with elevated concentrations of heavy metals, metalloids, ammonia, and other contaminants. These wastewaters require treatment via processes including wastewater stabilization ponds (WSPs). This study assessed the arsenic (As), iron (Fe), and ammonia (NH3) concentrations in a Saskatchewan DWTP WSP system of five sequential ponds. Drone imaging combined with flow and depth data was used to estimate retention times which increased from 7–9 to 8–10 days after the DWTP upgrade. Concentration trends showed Fe decreased from Pond 1 to 3 and increased in Ponds 3 and 5, while As decreased from Pond 1 to 5. Average effluent As concentrations of 10.6 µg/L were above the 5.0 µg/L guideline, while concentration guidelines for both Fe and NH3 were easily met post-upgrade in 2020. Several actions are recommended to ensure adequate WSP operation including dredging, aeration, and installing macrophytes capable of As uptake.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5c2ab884a61f54b0d3abb94d30ba1a4d https://doi.org/10.1139/cjce-2021-0306 Zobrazit plný text záznamu Plný text ve formátu PDF