Sediment

Abstract In this study equilibrium isotherms, kinetics and thermodynamics of ciprofloxacin on seven sediments in a batch sorption process were examined. The effects of contact time, initial ciprofloxacin concentration, temperature and ionic strength on the sorption process were studied. The Kd parameter from Linear sorption model was determined by linear regression analysis, while the Freundlich and Dubinin–Radushkevich (D–R) sorption models were applied to describe the equilibrium isotherms by…

Bioturbation effects on sediment properties also impact nitrogen cycling processes. In general, bioturbation increases nitrification activity by increasing the proportion of oxic sediment in which nitrification can occur (Fig.2) (Sayama and Kurihara, 1983, Tuominen et al., 1999, Welsh, 2003, Nielsen et al., 2004). Rates of denitrification also tend to be higher (Gilbert et al., 1995, Ieno et al., 2006) as bioturbation promotes coupled nitrification-denitrification (Kristensen and Blackburn, 1987…

costal erosion Boiol242 Week 3 Sandy beaches are a dynamic system that naturally experiences phases of erosion and accretion. Storm systems producing high energy waves that can rapidly erode sediments, particularly when infrequent or intense. During calmer periods, average swell waves deliver sediment back to the shoreline (beach accretion). Beach accretion is a much slower process than erosion whereby it’d take severl years for a beach to return to its pre – storm condition after a major…

The Atchafalaya Basin The Atchafalaya Basin, or Atchafalaya Swamp, is the largest wetland and swamp in the United States. Located in south central Louisiana, it is a combination of wetlands and river delta area where the Atchafalaya River and the Gulf of Mexico converge. The river stretches from near Simmesport in the north through parts of eight parishes to the Morgan City area in the south. The Atchafalaya is unique among Louisiana basins because it has a growing delta system with nearly…

Sediment-hosted copper deposits are formed by fluid mixing in permeable sedimentary and (more rarely) volcanic rocks. Two fluids are thought to be involved: an oxidized brine carrying copper as a chloride complex, and a reduced fluid that commonly formed in the presence of anaerobic sulfatereducing bacteria. For a sediment-hosted copper deposit to form, four conditions are required: (1) an oxidized source rock, (2) a brine to mobilize copper, (3) a reduced fluid to precipitate copper, and (4)…

(Bradley, 2015) Data collection and calibration Geological sediments Geological evidence is the most widely distributed and commonly used approach to reconstruct the past climate. One of the essential way is the isotopic test. For example, the proportion of O18 in relation to O16 is temperature dependent in the organic…

Did you know that only 10% of the world is covered by glaciers? The Laurentide ice sheet was 13 million square miles. And it shaped Canada and Minnesota. In this paper, I will explain the effects of the Laurentide ice sheet on Minnesota's landscape. Glaciers may seem irrelevant to how we live now because in Minnesota there hasn't been a glacier for a long time but, they formed our state. The last glacial advance start of the Des Moines lobe was about 75,000 years ago. The last glacial…

mudboils are where pressurized groundwater flows up through a restricting layer of silt, clay and fine sand. Mudboils usually take place in subduction zones of the Earth. The mudboil causes the land surface to slowly decline and the erosion of suspended sediment which creates a sequence of concentric ring fractures around the discharging mudboil. Mudboils are driven by pressurized groundwater, geothermic heat, and gases. As a consequence, the mudboils continuously discharging turbid water nearby…

Beginning with Lithogenous sediments, they are the major sediments found on the ocean floor, they are created through the process of both chemical and mechanical weathering of rocks, mostly quartz. These Lithogenous particles make up beaches, rivers and even glaciers. Biogenous sediments are primarily derived from the parts of a once living sediment. This sediment is generally made up from dissolving shells, teeth and bones from decaying organisms. Biogenous sediments are formed and lay on…

The video “ANTARCTICA SECRETS: Beneath the Ice” by Gary Hochman is about the polar researching teams researching and experiment on the Antarctica where is coldest and driest place. They believe that Antarctica has surprised climate history. They all focused on the same matter of climate change. At the beginning, they mentioned that the carbon dioxide from green house and fossil fuel can cause the global warming. Also, they addressed the matter of the climate change that can effect on the earth…