title: Stormwater biofilter treatment model (MPiRe) for selected micro-pollutants.
abstract: Biofiltration systems, also known as bioretentions or rain-gardens, are widely used for treatment of stormwater. In order to design them well, it is important to improve models that can predict their performance. This paper presents a rare model that can simulate removal of a wide range of micro-pollutants from stormwater by biofilters. The model is based on (1) a bucket approach for water flow simulation, and (2) advection/dispersion transport equations for pollutant transport and fate. The latter includes chemical non-equilibrium two-site model of sorption, first-order decay, and volatilization, thus is a compromise between the limited availability of data (on stormwater micro-pollutants) and the required complexity to accurately describe the nature of the phenomenon. The model was calibrated and independently validated on two field data series collected for different organic micro-pollutants at two biofilters of different design. This included data on triazines (atrazine, prometryn, and simazine), glyphosate, and chloroform during six simulated stormwater events. The data included variable and challenging biofilter operational conditions; e.g. variable inflow volumes, dry and wet period dynamics, and inflow pollutant concentrations. The model was able to simulate water flow well, with slight discrepancies being observed only during long dry periods when, presumably, soil cracking occurred. In general, the agreement between simulated and measured pollutographs was good. As with flows, the long dry periods posed a problem for water quality simulation (e.g. simazine and prometryn were difficult to model in low inflow events that followed prolonged dry periods). However, it was encouraging that pollutant transport and fate parameters estimated by the model calibration were in agreement with available literature data. This suggests that the model could probably be adopted for assessment of biofilter performance of other stormwater micro-pollutants (PAHs, phenols, phthalates, etc.). The model, therefore, could be applied in practice for sizing of biofilter systems and their validation monitoring, when used for stormwater harvesting.
authors.affiliation: Faculty of Civil Engineering, University of Belgrade, Belgrade, 11000, Serbia. Electronic address: anja.randelovic@gmail.com.
authors.forename: Anja
authors.initials: A
authors.lastname: Randelovic
authors.affiliation: Monash Water for Liveability, Department of Civil Engineering, Monash University, Wellington Rd, Clayton, VIC, 3800, Australia; CRC for Water Sensitive Cities, Melbourne, VIC, 3800, Australia.
authors.forename: Kefeng
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Faculty of Civil Engineering, University of Belgrade, Belgrade, 11000, Serbia.
authors.forename: Nenad
authors.initials: N
authors.lastname: Jacimovic
authors.affiliation: Monash Water for Liveability, Department of Civil Engineering, Monash University, Wellington Rd, Clayton, VIC, 3800, Australia; CRC for Water Sensitive Cities, Melbourne, VIC, 3800, Australia.
authors.forename: David
authors.initials: D
authors.lastname: McCarthy
authors.affiliation: Monash Water for Liveability, Department of Civil Engineering, Monash University, Wellington Rd, Clayton, VIC, 3800, Australia; CRC for Water Sensitive Cities, Melbourne, VIC, 3800, Australia.
authors.forename: Ana
authors.initials: A
authors.lastname: Deletic
mesh_terms: D001673:Biodegradation, Environmental; D002725:Chloroform / Q000737:chemistry; D005374:Filtration / Q000295:instrumentation / Q000379:methods*; D005998:Glycine / Q000031:analogs & derivatives / Q000737:chemistry; D008962:Models, Theoretical; D011891:Rain; D014227:Triazines / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D000097797:Glyphosate
chemical_list: D002725:Chloroform; D005998:Glycine; D014227:Triazines; D014874:Water Pollutants, Chemical; D000097797:Glyphosate
keywords: Chloroform; Glyphosate; Micro-pollutant modelling; Stormwater biofilter; Triazines