Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Circum-neutral"”.
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Geochemistry and Microbiology of Extremely Alkaline (Ph > 12) Ground Water in the Calumet Slag -Fill Aquifer
… motive force, and with the need to maintain a circum-neutral intracellular pH (Horikoshi and Akiba, 1982). Here I describe a diverse microbial community that inhabits extremely alkaline (pH ≈ 12--13) groundwater from the Lake Calumet region Using microbial culturing, genetic sequencing, and …
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Understanding Formation and Transport of Amorphous Iron Oxyhydroxides in Porous Media using Microfluidic Flow Cells- a Novel Method to Study Freshwater Iron Cycling
… The mixing zone is characterized by a near neutral pH, ambient temperature and a sharp oxygen concentration which in turn has deep impact on the iron cycling and thus the fate of contaminants in the water column. We constructed an experimental micromodel that to observe key processes that …
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Investigation of alternative carbon sources for the biological treatment of synthetic sulphate-laden water and mine impacted water in a linear flow channel reactor
… are not cost-efficient when treating low-volume, circum-neutral wastewater. Biological sulphate reduction (BSR) offers a sustainable alternative for sulphate removal and is applicable to partially treated AMD as well as circum- neutral, mine-impacted water. Coupled with partial sulphide oxidation, …
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Assesment of Water and Sediment Quality in an Abandoned Mine Lands, Tuscaloosa County, Alabama
… June 2022 and May 2024.Stream water pH remained circum-neutral (7–8) throughout the study period, but elevated conductivity (600–1800 µS/cm) and sulfate levels (100–1200 ppm) were observed, except during winter months. In contrast, retention pond (SW8, SW9) and pond outlet (SW10) samples …
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Coupling source term, mineral reactivity and flow in radionuclide transport
… glass in deionised water at 40 and 90 oC and circum-neutral pH. Experiment Part 2 considers the dissolution of the waste glass in simulant groundwaters, with similar compositions to groundwaters of Callovo-Oxfordian clay (lower-strength sedimentary rock (LSSR)) and Borrowdale Volcanic Group …
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Phosphate stabilisation of partly oxidised, polyminerallic mine wastes
… of stagnant pools. Flushing of the streambed by neutral pH waters during heavy rainfall events dissolves the efflorescences resulting in remobilisation and transportation of sulphate and metals (particularly Cd, Zn) downstream. Thus, in areas of seasonal or irregular rainfall, secondary …
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Active neutralisation and amelioration of acid mine drainage with fly ash
… ratios have shown that fly ash is capable of neutralising AMD and increasing the pH beyond neutral values, which optimises the removal of heavy metals and ions. The trend was: the more fly ash added the quicker was the reaction time and higher the pH values achieved. Iron was reduced by as …
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An investigation into the precipitation of Fe(III) oxyhydroxides in lime neutralization processes
… by poor dewatering behaviour and postneutralization instability which increases the risk of the adsorbed or encapsulated dissolved metals to re-leach from the disposal sites, thus lessening the likelihood for metal value recovery, waste material reuse or recycle. These negative …