Groundwater pollution containing ammonium, iron and manganese in a riverbank filtration system: Effects of dynamic geochemical conditions and microbial responses

Abstract

Bench-scale experiments were conducted to investigate the effect of hydraulic loadings and influent concentration on the migration and biotransformation behaviour of three groundwater pollutants: ammonium (NH 4 +), iron (Fe 2+) and manganese (Mn 2+). Columns packed with aquifer media collected from a riverbank filtration (RBF) site in Harbin City, NE China were introduced synthetic groundwater (SGW) or real groundwater (RGW) were at two different constant flow rates and initial contaminant concentrations to determine the impact of system conditions on the fate of the target pollutants biotransformation. The results showed that the biotransformation rate of Fe 2+ Mn 2+ and NH 4 + decreased by 8%, 39% and 15% under high flow rate (50 L d −1) compared to low flow rate (25 L d −1), which was consistent with the residence-time

Heavy Metal Removal from the Water of the River Nile Using Riverbank Filtration

“…The quantity of water, geological conditions, and pollution on the surface bank are important factors that may hinder the success of the riverbank filtration process [23]. Also, the seasonal variations may cause a decrease in RBF efficiency due to the change in microbial diversity during wet and dry seasons [24]. Clogging in the riverbed is an important factor that affects the quantity and quality of water during the RBF process [25].…”

The removal of ammonia, arsenic, iron and manganese by biological treatment from a small Iowa drinking water system

“…Alternatively, in the presence of oxygen, iron, manganese and arsenic can be oxidized by bacteria and co-removed with biologically oxidized ammonia. 9,11,[25][26][27][28] Given the negative issues associated with high ammonia, iron and manganese concentrations in drinking water, and the health risks directly associated with arsenic and nitrite, there was a clear need to identify an effective treatment approach to remove these contaminants from Gilbert's drinking water; while simultaneously considering practical constraints on the small water system. Therefore, the objective of this work was to evaluate the effectiveness of an innovative aerobic biological treatment approach to simultaneously reduce ammonia, iron, manganese and arsenic below their respective primary and secondary MCLs.…”