Oxidation of organic contaminants by manganese oxide geomedia for passive urban stormwater treatment systems

Biochar-augmented biofilters to improve pollutant removal from stormwater – can they improve receiving water quality?

“…Biofilter performance may be improved in various ways, such as alteration of the hydraulics of the system and creation of a submerged zone, 43,44 addition of plants or fungi with pollutant-removal capabilities, [45][46][47][48][49] or alteration of geomedia. Though certain types of engineered geomedia have proven effective for targeted contaminant removal (e.g., manganese-oxide, iron-oxide coated sands, 50,51 surfacemodified biochar, 52,53 and functionalized polymer clays 54 ), Fig. 2 Cumulative number of unique SCMs with water quality data in the International Stormwater BMP Database by year, coded by SCM category.…”

Urban Stormwater Characterization, Control, and Treatment

“…Papers in this section span topics related to the development of innovative materials for stormwater filtration, optimization of stormwater treatment trains, quantification of non-structural LID practices, and linkages between social factors and stormwater quality. In addition to papers addressing enhanced media for bioretention systems as reviewed in the Bioretention section, six other papers were identified in which specialized sorbents and other filtration media were assessed for their general applicability to remove metals (Genc-Fuhrman et al, 2016;Huber, Hilbig, et al, 2016;Soleimanifar et al, 2016), nutrients (Rad et al, 2016;Soleimanifar et al, 2016), organic contaminants (Grebel et al, 2016), and bacteria . For example, wood mulch coated with aluminum-based water treatment residuals acted as a filtration media with high affinity for metals and desirable hydraulic characteristics (Soleimanifar et al, 2016).…”

“…Recovery of TiO2 nanoparticles, a concern raised in previous studies, was enhanced through combination with graphene oxide nanosheets to increase the size, and thereby sedimentation rate and recovery potential, of TiO2 particles. Environmental conditions under which pollutants may desorb from various filtration materials were also investigated (Grebel et al, 2016;Huber, Hilbig, et al, 2016;Genç-Fuhrman et al, 2016). Although response varied by material type, these studies suggest that exposure to road salts, particularly combinations of sodium and calcium chlorides, humic acids, and non-neutral pH, any of which can be expected in stormwater runoff, may promote pollutant remobilization from filtration materials.…”

Catalytic Process Optimization of Birnessite‐based Fenton‐like Reaction with Surface Cu2+ Modification

“…Manganese oxides are ubiquitous in natural environments and play a positive role in regulating mobility and environmental fate of contaminants via adsorption, abiotic oxidation, catalytic transformation, or photochemical processes . Manganese oxides, particularly birnessite (δ‐MnO 2 ), are naturally occurring minerals with stacked layered oxide structures of varying composition that are of low crystallinity in a mixed valence (+2/+3/+4) configuration .…”