Fate of lime-based amendments applied for improving freshwater and seawater aquatic environments

Abstract

The fate and chemical forms of lime after application in an aquatic environment were studied for the duration of 12 weeks. In freshwater, critical compounds were CaCO3 and Ca(OH)2; relative composition of CaCO3 in precipitants was increasing between weeks 2 and 8, and then reached approximately 60%. In seawater, CaCO3, CaSO4 · 2H2O and Mg(OH)2 were recognized as critical constituents; composition of CaCO3 showed maximum between weeks 2 and 6, and CaSO4 · 2H2O began to increase from week 8. Final compositions of three compounds were 66.7% for Mg(OH)2, 19.7% for CaSO4 · 2H2O and 13.6% for CaCO3.