Case studies

ANGLO COAL NEW VAAL COLLIERY, SOUTH AFRICA

THE CHALLENGE

New Vaal Colliery urgently needed to access coal reserves and prevent spillage from a containment dam.

OUR SOLUTION

PROXA installed an emergency mobile water treatment plant to address the client’s time-sensitive needs.

HOW PROXA ADDED VALUE

  • After reviewing the required water treatment capacity onsite, the plant capacity was increased from 4 MLD to 6 MLD. The plant was further expanded to a Zero Liquid Discharge (ZLD) plant via a phased approach.
  • The final brine treatment, comprising a combination of thermal evaporation as well as cooling crystallisation, produces 40 tons of salt per day and high quality product water for reuse at Letabo power station.
  • We are also responsible for the operations and maintenance supervision of the water treatment plant, including technical support and optimisation of the lifecycle costs associated with the operations of the plant.

FEED WATER

Contaminated underground mine water.

PRODUCT WATER

For reuse at Letabo Power Station.

PROCESS

  • Drum filtration
  • Dissolved air flotation
  • Ultra filtration
  • Reverse osmosis
  • Thermal evaporation
  • Cooling crystallisation
  • Polishing Reverse Osmosis

PROCESS RELIABILITY

In dealing with variable feed streams such as contaminated mine water, process robustness and operational flexibility is of critical importance in continuously meeting environmental discharge requirements.

PROXA is a leader in the field of process innovation. Through our in-house process development laboratory, PROLAB®, and the support of PROSERV® – which optimises life cycle costs for chemicals, consumables and spares – we are able to assist with the rapidly changing requirements of mining clients.

ENVIRONMENTAL PROTECTION

PROXA has a proven track record in delivering and operating systems capable of treating variable effluent mine water, working with all stakeholders to ensure protection of the environment and implementation of Long Term Zero Liquid Discharge Solutions.

PLANT COMMISSIONED

2009

 

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