Paste, or thickened tailings, have become an increasingly important method to address many of the environmental problems facing the mining industry. The term “paste” as used in this discussion applies to the full range of non-settling tailings that exhibit a yield stress such as “thickened tailings” and “mine paste backfill.”
Photo courtesy of Yukon News and CMS Photos
Acid mine/rock drainage is a rampant problem in the world today. The above photo depicts acid drainage at an abandoned mine in the Yukon Territory of northwest Canada. This mine shares a similar history to thousands of other mines throughout the world. It was in operation for six short years in the 1950’s, producing gold ore. Its profitability eventually failed and it was abandoned. In the years following, the mine changed ownership several times, making it very difficult for the government to enforce treatment for the acid rock drainage that the mine created.
Category: Acid Mine Drainage Treatment
Clarifiers are expensive, to buy or repair, and their downtime can be costly in fines imposed by regulatory agencies and in community ill will. Regular maintenance, an annual inspection of the mechanism and an occasional touchup of the paint or coating system are simple and inexpensive proactive steps that will usually prevent most problems. Three components of all clarifiers require maintenance: the effluent system, the sludge removal system and the drive. The effluent and sludge removal systems require maintenance only occasionally, whereas the drive requires regular maintenance.
Category: Clarifier Maintenance
Landfills are categorized by regulations in three types: industrial, municipal, and hazardous. Individual landfills may be further differentiated by the types of waste which they accept.
All landfills are required to be capped, usually occurring at the end of each day. The cap is typically 6-8” of soil. The cap reduces odor and loss due to wind. At the closing of the landfill, a permanent cap consisting of a membrane and more soil is added.
Before the landfilling operation begins, an “impermeable” base is required. This usually consists of two layers of membranes separated by at least 12” of sand. A network of drain pipes is buried in the sand. These pipes transport the wastewater that must be treated.
Category: Landfill Leachate Treatment
Reclamation and reuse of unconventional wastewater sources for plant raw water, cooling water and process pre-treatment has increased substantially due to increases in the cost of drinking water, recurring water shortages that can impact business operations, and tightening government regulation.
Category: Industrial Water Reuse
Centralized treatment of wastewater is emerging as a viable solution for long-term efficiency in managing water sourcing and wastewater treatment in hydraulic fracturing.
Category: Hydraulic Fracturing