Abstract
This study investigates the impact of eggshell particle size and solid-to-water (s/w) ratio on lead (Pb2++) removal from aqueous solution. Collected raw eggshells were washed, crushed, and sieved into two particle sizes (<150 and 150-500 μm). Batch Pb2++ removal experiments were conducted at different s/w ratios with initial Pb2++ concentrations of up to 70 mg/L. The contribution of precipitation to Pb2++ removal was simulated by quantifying removal using eggshell water, whereas sorbed Pb2++ was quantified by acid digestion. Results indicated that eggshell particle sizes did not affect Pb2++ removal. High removal (up to 99%) of Pb2++ was achieved for low initial Pb2++ concentrations (<30 mg/L) across all s/w ratios studied. However, higher removal capacity was observed at lower s/w ratios. In addition, results confirmed that precipitation played a major role in the removal of Pb2++ by eggshells. Yet, this role decreased as the s/w ratio and initial concentration of Pb2++ increased. A predictive relationship that relates the normalized removal capacity of eggshells to the s/w ratio was developed to potentially facilitate the design of the reactor.
Original language | English |
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Article number | 2517 |
Journal | Water (Switzerland) |
Volume | 12 |
Issue number | 9 |
DOIs | |
Publication status | Published - Sept 2020 |
Keywords
- Pb+ removal
- Precipitation
- Removal mechanisms
- Solid-to-water ratio
- Sorption
- Waste recycling
ASJC Scopus subject areas
- Geography, Planning and Development
- Biochemistry
- Aquatic Science
- Water Science and Technology