Sökning: "ZVI"

Visar resultat 1 - 5 av 7 uppsatser innehållade ordet ZVI.

1. 1. Fastläggning av arsenik med nollvärt järn i mikrostorlek : Uppföljning av ett pilotskaleförsök

   Uppsats för yrkesexamina på avancerad nivå,

   Författare :Frida Aronsson; [2023]
   Nyckelord :contaminated soil; arsenic; zero-value iron; mZVI; pilot test; pilot study; förorenad mark; arsenik; nollvärt järn; mZVI; pilotförsök; pilotstudie;

   Sammanfattning : Land contaminated with arsenic is a major problem as arsenic is toxic and poses a major health risk to both humans and animals. There are several remediation methods, both in-situ and ex-situ, to prevent and deal with pollution problems in different ways. LÄS MER

3. 2. Solubility of arsenic in untreated and ZVI-treated contaminated aquifer material

   Master-uppsats, SLU/Dept. of Soil and Environment

   Författare :Oscar R. Davies; [2022]
   Nyckelord :Hjältevad; zerovalent iron; phosphate extraction; Oxalate extraction; Visual MINTEQ; geochemical modelling;

   Sammanfattning : Arsenic (As) is a toxic element to all life and exists in nature both naturally and anthropogenically. Naturally As contaminated soils are formed due to high geogenic background As concentrations which is released when bedrock is eroded. Asia is a continent with a high amount of naturally As contaminated soils and groundwater. LÄS MER

4. 3. Long-term Effect of Metallic Iron Sorbents on Arsenic Mobility in an Anoxic Aquifer : An assessment based on long-term column experiments

   Master-uppsats, SLU/Dept. of Soil and Environment

   Författare :Stéphanie Nyström; [2022]
   Nyckelord :Zero valent iron; ZVI; Remediation; Anoxic; Column tests; ICP-MS;

   Sammanfattning : Zero valent iron (ZVI) sorbents have successfully remediated soils burdened with different groups of contaminants. When working to alleviate arsenic (As) contamination, the location-specific subsurface chemistry greatly affects the efficiency of the sorbents as it controls the speciation of As and the transformation of the ZVI, as well as the interaction between these (remediating mechanisms). LÄS MER

5. 4. Remediation of an arsenic-contaminated anoxic aquifer in hjältevad with zerovalent iron : assessment and modelling of sorption strength and solubility of arsenic

   Master-uppsats, SLU/Dept. of Soil and Environment

   Författare :Kathrin Leicht; [2021]
   Nyckelord :arsenic remediation; zerovalent iron; anoxic aquifer;

   Sammanfattning : In-situ injection of zerovalent Iron (ZVI) particles to remediate contaminated groundwater is a widely applied approach. However, studies assessing the remediation and immobilisation mechanisms of Arsenic (As) under anoxic field conditions with zerovalent iron particles are lacking, especially for nanosized sulphidated ZVI (S-nZVI) and oxidic shell free ZVI (OSF-nZVI). LÄS MER

7. 5. Remediation of Contaminated Groundwater Using a SpinChem® Rotating Bed Reactor : Competitive Sorption of Metal(loid)s in Complex Solutions under Varying Geochemical Conditions

   Master-uppsats, Luleå tekniska universitet/Geovetenskap och miljöteknik

   Författare :Pär Alapää; [2018]
   Nyckelord :Groundwater Remediation; Competitive Sorption; SpinChem;

   Sammanfattning : The potential of utilizing a new form of chemical processing technology called SpinChem® Rotating Bed Reactor (RBR), in combination with different reactive materials, for the purpose of remediating multi-contaminated aquifers under changing environmental conditions, was investigated using laboratory studies and geochemical models. Four different reactive materials, or combinations thereof, were tested: heat-treated peat powder combined with zero-valent iron (ZVI); IronPeat, which consists of peat powder coated with a ferriferous hydrosol (FFH); and a powdered steel waste product. LÄS MER