Project Description

Mine Water Treatment

We have extensive experience in the treatment of mine effected waters and are able to engineer world class solutions combining conventional treatment with UF, RO, and NF, all with in house application using the latest technology. We particularly specialize in high recovery and advanced systems with the ability to deal with all aspects of mine water treatment with bespoke solutions for neutralization and reclamation, waste minimization and conversion to useful end products.

Prentec engineers have intimately involved in the development and commercialization of the High Recovery Precipitating Reverse Osmosis Process (HiPRO). Today this is the worldwide leading process for the recovery of high sulphate acidic mine waters. In addition to this novel mine water treatment technology, Prentec’s team of engineers have led the development of a large-scale Eutectic Freeze Crystallization process for the economic treatment of rejects and brines from RO plants.

Prentec is able to deal with all aspects of mine water treatment with unique solutions for neutralization and reclamation, waste minimization and conversion to useful end products.

Featured Projects

Tweefontein

Client: Glencore
Location: South Africa

Prentec was contracted by Glencore to provide a Zero Liquid Discharge (ZLD) solution for their operation at Tweefontein. With extensive experience in mine water reclamation and ZLD applications, Prentec has constructed a 19,400 m3/day water reclamation plant comprising of a 2-stage RO membrane process with inter-stage softening. The brine stream from the 2 stage RO process is treated in a state-of-the-art eutectic freeze crystallization unit where water is recovered leaving only a solid stream as waste. This process configuration achieves a ZLD status.

A potable water supply of 10,000 m3/day is generated by mineralizing and chlorinating the permeate stream. The product water complies with SANS drinking water standard and is supplied to the local municipality.

The high recovery plant is operated by the Prentec operations team.

Apart from the treatment plant, the project included supporting infrastructure such as water retaining structures, offices, control room, laboratories, change houses, and workshops.

Matla Water Reclamation Plant

Client: Exxaro
Location: South Africa

The project delivered the 10,000 m3/day mine water reclamation plant comprising of a 2-stage membrane process with inter-stage softening to achieve an overall water recovery >96%. The RO permeate is mineralized and chlorinated, complying to the SANS drinking water standard. The plant is operated via an Operations and Maintenance Contract by Prentec.

Early planning and hands on construction management were key to delivering the project in the shortest time possible. The water retaining structures and unit process were prefabricated in our inhouse manufacturing facility and subjected to industry leading quality control procedures and standards before being transported to site. FAT testing of membrane skids and equipment prior to delivery minimized time lost during the construction and commissioning phases.

Process Capabilities