Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Afrique du Sud → 2019 → The water balance of vermiculite covers on mining wastes in a semi-arid environment

University of KwaZulu-Natal (2019)

The water balance of vermiculite covers on mining wastes in a semi-arid environment

McDonald, Johann.

Titre : The water balance of vermiculite covers on mining wastes in a semi-arid environment

Auteur : McDonald, Johann.

Université de soutenance  : University of KwaZulu-Natal

Grade : MSc School of Agriculture, Earth and Environmental Sciences 2019

Résumé partiel
Deposition of large quantities of mining waste is an activity that can have a negative impact on surface and ground water resources. These impacts necessitate reclamation and amelioration of the wastes through various measures to reduce these impacts. Specific reclamation measures are therefore needed for mine closure and legal requirements. These requirements include covering the waste with a sustainable cover material which is then vegetated. Covers are mostly designed to restrict the ingress of water into the mine waste, from where water might move pollutants into the environment. Cover designs could also allow for natural attenuation/degradation of pollutants within the waste and often contribute to design stability. To act effectively, the covers need to be constructed of materials matched to the design and task. The primary task of the cover soil is to hold water for vegetation and and subsequently release it into atmosphere and so contribute to the integrity of the cover. Ideal materials are not always readily available and so some understanding of cover material characteristics are required before effectiveness of the cover’s contribution to the site water balance can be evaluated. The interaction of the waste cover with the waste material should also be evaluated for its contribution to sustainability and to the cover’s water balance. Knowledge of these interactions will always be beneficial, as the availability of water for the vegetation in the cover stays important for the stability of the cover. This benefit, though, is dependant on the pollution potential of the waste in relation to the cover material.

Présentation

Version intégrale (4,4 Mb)

Page publiée le 3 juin 2021