Arsenic removal by iron based co-precipitation : Mechanisms in groundwater treatment

Abstract

Research objectives 1.7 Thesis outline References 2. Arsenite removal in groundwater treatment plants by permanganate and ferric treatment Abstract 2.1 Introduction 2.2 Materials and methods 2.2.1 Treatment layout and water quality of WTP Dorst 2.2.2 Optimizing MnO 4-Fe(III) doses to achieve <1 µg/L As 2.2.3 Influence of MnO 4-Fe(III) dosing on removal of As, Fe, Mn and NH 4 + 2.2.4 Influence of MnO 4-Fe(III) dosage on filter backwash solids characteristics 2.2.5 Settling characteristics of filter backwash solids 2.2.6 Solid phase characterization 2.2.7 Analysis of water samples 2.3 Results and discussion 2.3.1 Optimizing MnO 4-Fe(III) doses to achieve <1 µg/L As 2.3.2 Influence of MnO 4-Fe(III) dose on As, Fe, Mn and NH 4 + removal profiles 2.3.3 Influence of MnO 4-Fe(III) dosing on filter backwash solids 2.4 Conclusions Acknowledgements References 3. Characteristics of Fe and Mn bearing precipitates generated by Fe(II) and Mn(II) co-oxidation with O 2 , MnO and HOCl in the presence of groundwater ions Abstract 58 3.1 Introduction 59 3.