Thesis
Impact of interfering compounds on the ferric chloride arsenic removal treatment process
Washington State University
Master of Science (MS), Washington State University
2013
Handle:
https://hdl.handle.net/2376/102258
Abstract
Since implementation of the 0.010 mg/L maximum contamination level drinking water standard for arsenic, many small public water suppliers have been struggling to remain in compliance. A popular treatment strategy is coagulation/flocculation using ferric chloride followed by filtration. The presence of phosphate and/or silicate in the source water, however, has been shown to decrease arsenic removal. The objective of this research was to evaluate arsenic removal and floc formation as a function of ferric chloride dose, silicate concentration and phosphate concentration. A synthetic groundwater, developed based on the average composition of major constituents found in Island County, WA groundwater was used in all experiments. Field treatment conditions were replicated using standard jar testing equipment to evaluate the impact of a range of silicate and phosphate concentrations on arsenic removal. Arsenic concentrations were determined by Inductively Coupled Plasma-Mass Spectrometry. In synthetic groundwater that contained no phosphate or silicate, arsenic concentrations in filtrate ranged from 0.004 to 0.002 mg/L (95 to 97 % removal) over the range of iron concentrations evaluated. Both phosphate and silicate decreased arsenic removal at low iron dosages, resulting in arsenic concentrations greater than 0.010 mg/L. However, higher iron dosages overcame the v interfering compounds effects, reducing arsenic concentrations to levels that were below the maximum contamination level.
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Details
- Title
- Impact of interfering compounds on the ferric chloride arsenic removal treatment process
- Creators
- Benjamin Henry Ware
- Contributors
- David R. Yonge (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525091001842
- Language
- English
- Resource Type
- Thesis