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Re: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Draft Final BRES No. 35 Del Monte Reclamation Improvement Sites Field Sampling (FSP) (dated August 14, 2025)
No full textDraft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 50 – Zelia Site Evaluation Summary Report
No full textFinal Butte Treatment Lagoons (BTL) Groundwater Treatment System Routine Operations, Maintenance, and Monitoring (OM&M) Plan
No full textRe: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Insufficiently Reclaimed Sites Sampling: BRES No. 38 – Sister Dump Site Evaluation Summary Report (dated September 30, 2025)
No full textRe: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-20 Site Evaluation Summary Report (dated October 24, 2025)
No full textRe: Approval letter for the Butte Priority Soils Operable Unit (BPSOU) Revised Draft Final 2022 Unreclaimed Sites Sampling: UR-13 Site Evaluation Summary Report (dated October 22, 2025)
No full textDrinking Water Treatment Using Microbial Cellulose Membranes
No full textAccess to clean drinking water is a global concern. Existing water filtration technologies require high energy and chemical inputs. They generate a large volume of waste and are not always readily available. This limitation has given rise to the development of sustainable water filtration technologies. This study focused on developing a biodegradable Microbial Cellulose Membrane (MCM) made of bacterial cellulose that is capable of treating a wide variety of pollutants present in environmental water sources. To improve MCM properties for high flux and contaminants removal, they were pre-treated with NaOH (0.25 M). The effect of transmembrane pressure and membrane thickness on flux and contaminants removal was investigated. The water was collected from three different sources from Silver Bow County, Montana including Silver Bow Creek, Basin Creek, and simulated Butte groundwater samples. The MCMs were operated at a pressure range of 69-276 kPa (10-40 psi), which is comparable with industrial ultrafiltration membrane systems that require a typical pressure of 200 to 500 kPa. MCMs of different thicknesses, ranging from 1.25-2.25 mm, were tested. A maximum flux of 950 L/m2/h was achieved at 276 kPa using an MCM with a thickness of 1.5 mm. MCMs demonstrated a microbial removal efficiency of between 96% - 100%. MCMs were not able to remove metals and anions present in the water. Flux test results showed the MCM flux rates (350-950 L/m2/h) exceeded that of commercial UF membranes (85-340 L/m2/h) while operating at lower pressures. Future work will focus on improving MCM surface properties to retain salts and metals
Butte Reclamation Evaluation System Corrective Action Plans for Reclaimed Sites - 2024 BRES Site Specific Corrective Action Plans for Quadrant 1
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