Calcite Dissolution Kinetics and Lake Neutralization

摘要

Models for the dissolution of minerals in acidic aqueous solution are discussed, and in particular the dissolution kinetics of calcite. The dissolution kinetics of other minerals such as dolomite tricalciumsilicate, olivine and K-feldspar are included for comparison. The kinetic expressions have been incorporated into a model for lake liming, that will predict the dissolution of a calcite powder when distributed in a lake. A sensitivity analysis of lake neutralization is discussed. A model that describes the reacidification of a limed lake is discussed. The model is based on a mass balance for the lake, and considers the long term dissolution-deactivation of residual calcite on the lake bottom. The model is used to carry out a sensitivity analysis of the reacidification of a limed lake. Based on the dissolution models a neutralization dose calculation routine is suggested, defining a minimum required dose and a maximum dose. Costs of lake liming is discussed and the reacidification model used to carry out a sensitivity analysis of neutralization costs for lakes. (ERA citation 11:020965)