Tuesday 2:50 Bernard Aube M.A.Sc., P.Eng, EnvirAubé
High Density Sludge Production when Treating Mine Waters
For many closed or operating mine sites, active lime treatment is the best alternative to treating acid mine drainage (AMD) resulting from the oxidation of sulphides. This is a relatively inexpensive and very effective means of meeting discharge requirements and has the advantage of being able to treat high acidity and high flowrates. Unfortunately, many types of treatment processes produce a voluminous sludge containing only 1 to 3 % solids, the remainder of the mass being tightly bound water. This presentation describes the factors that influence the production of a high-density sludge (HDS), a product that allows operators to save considerably on sludge disposal costs by reducing the volume of waste. These factors include the raw water chemistry, the process design, the reagents used, the process operating parameters, and equipment used. When the right combination is put together, sludges of more than 25% solids can be formed.
Mr. Aubé completed a Bachelor in Applied Sciences, Chemical
Engineering, from University of Waterloo in 1992. He then worked on various
aspects of mine environment at Noranda Technology Center for 10 years.
During this time, he specialised in treatment of acid mine drainage and
smelter effluents. Bernie obtained a Master’s degree in Environmental
Engineering from École Polytechnique (University of Montreal engineering
School). His Master’s thesis was on the comparison of the Geco
and Conventional High-Density Sludge processes in a pilot scale. Bernie
started his own consulting company in 2001, EnvirAubé, specialising
in the design and optimisation of treatment plants and sludge disposal.
He is currently working on a project to treat zinc in a large pit lake
in Northern Québec and consulting on a molybdenum treatment plant
to be built in Chile.