Lake, Craig
http://hdl.handle.net/10222/39724
2024-03-29T15:35:25ZBiodegradation kinetics of individual and mixture non-steroidal anti-inflammatory drugs in an agricultural soil receiving alkaline treated biosolids
http://hdl.handle.net/10222/81982
Biodegradation kinetics of individual and mixture non-steroidal anti-inflammatory drugs in an agricultural soil receiving alkaline treated biosolids
Shu, W; Price, G; Jamieson, R; Lake, C.B
Land application of biosolids is one potential source of pharmaceuticals and personal care products (PPCPs) into agricultural soils. Degradation is an important natural attenuation pathway that affects the fate and transport of PPCPs in soil system and could be altered upon biosolids application. The present study was performed to assess the degradation kinetics of three commonly used non-steroidal anti-inflammatory drugs (NSAIDs), including naproxen (NPX), ibuprofen (IBU), and ketoprofen (KTF), in a sandy loam soil amended with alkaline treated biosolids (ATB) introduced either as individual compounds or as a multi-compound mixture. Results of this study indicated the disappearance of studied NSAIDs in all treatments were mainly attributed to biodegradation and followed the first-order exponential decay response. In soil receiving ATB amendment, degradation of NPX and IBF in all treatments, as well as KTF in individual treatment was inhibited over the 14 day incubation study. Inhibition effect from ATB amendment was also observed in sterilized treatment. The presence of NSAIDs in mixture treatment reduced the degradation rate of NPX and KTF in soil, while the opposite results were observed in ATB amended soil. Ibuprofen exhibited the inhibition of degradation in both soil and ATB amended soil. Inversely, mixture compound environment stimulated the disappearance of all studied NSAIDs in sterilized treatment, except NPX in soil. Results of this study demonstrated the complex degradation behavior of NSAIDs in the presence of ATB and chemical mixtures, which warrants future investigation that incorporates a broader range of biosolids, soil type, and pharmaceutical mixtures to better understand the fate of pharmaceuticals in the environment.
2021-01-01T00:00:00ZCharacterizaing sediment physical property variability for bench scale dewatering purposes
http://hdl.handle.net/10222/81976
Characterizaing sediment physical property variability for bench scale dewatering purposes
Alimohammadi, M
A field sampling program was undertaken to assess the variability of physical characteristics of contaminated sediments in a large (160 ha) effluent stabilization lagoon. The objective of this paper is to use this “field lab” as a basis for comparing different sampling techniques (i.e. discrete and composite) for remediation-based evaluations (i.e. sediment volume estimates and bench scale dewatering studies). The distribution of sediment thickness measured throughout the lagoon by gravity core sampling is presented for context. Selected gravity core sediment samples are evaluated with respect to physical property (water/solids content, bulk density, and particle size) variability in both the vertical (i.e. within a single gravity core) and spatial directions (between among gravity cores). Composite samples created via homogenization of a single entire gravity core is performed to compare to the discrete and average physical properties of a nearby gravity core. Vacuum-based samples are also compared to gravity core samples in terms of particle size. It is demonstrated that by understanding sediment variability, composite samples can be shown to be an efficient method of obtaining representative samples. When large samples for dewatering trials are required, vacuum sampling can produce samples with similar mean particles size to discrete and composite samples.
2020-01-01T00:00:00ZParticle Size Effects on Breakage of ACT Aggregates Under Physical and Environmental Loadings
http://hdl.handle.net/10222/81975
Particle Size Effects on Breakage of ACT Aggregates Under Physical and Environmental Loadings
Choi, H.; Lake, C.B.; Hills, C.D.
Aggregates manufactured from fine-grained thermal waste residues using accelerated carbonation technology (ACT) represent a potential sustainable alternative to natural aggregates. However, for these manufactured products to compete with virgin stone in geotechnical applications, their durability under mechanical and environmental loadings must be assessed. This paper describes particle breakage that occurs for different grain sizes (entire sample, 5mm-2.5mm, and 2.5mm-1.25 mm) of a cement kiln dust accelerated carbonated manufactured aggregate after undergoing triaxial compression, triaxial shear and freeze/thaw (f/t) testing. It is shown that the particle breakage of the aggregate is dominated by the larger (5mm-2.5mm) size fraction of the sample under all loading conditions. Particle breakage results from f/t testing showed that the 5mm-2.5mm size corresponded to similar or slightly less particle breakage than that under triaxial shear, while the particle breakage of the 2.5mm-1.25mm aggregate
after 20 cycles of freeze-thaw was relatively small. The performance of the carbonated aggregate in terms of relative breakage was similar or slightly better than natural calcareous sand results in the literature.
2020-01-01T00:00:00ZDevelopment of a leaching procedure to asses the risk of uranium leaching due to construction and demolition waste
http://hdl.handle.net/10222/81740
Development of a leaching procedure to asses the risk of uranium leaching due to construction and demolition waste
Letman, M.M.; Drage, J.; Ryan, A.M.; Lake, C.B.; Jamieson, R.
Naturally-occurring uranium can be found at elevated concentrations in groundwater throughout the
world, with the potential to cause kidney damage in chronically exposed individuals. Empirical evidence
shows that uranium mobilization can be enhanced in the presence of ions that are associated with leachate
from construction and demolition (C&D) disposal sites. There is need for a simple and effective procedure
to evaluate soil and rock formations for uranium mobility prior to the permitting of waste disposal
facilities which could alter groundwater chemistry. A series of leachate extractions were performed to
represent the impact of C&D leachate on uranium-bearing rocks, focusing on the impact of calcium,
sodium, chloride, sulphate, and bicarbonate concentrations on uranium mobilization. Based on these
observations a uranium leaching procedure (ULP) was developed and compared to the synthetic precipitation
leaching procedure (SPLP). The ULP was capable of mobilizing an order of magnitude more uranium
than the SPLP from six rock samples and shows promise as a tool for assessing the risk of
groundwater contamination by C&D waste through uranium mobilization.
2018-01-01T00:00:00Z