Sulphate Removal From Water

Sulphate is widely distributed in nature and may be present in natural waters at a range of concentrations. High sulphate concentrations can be present in groundwater, and is common in mining/industrial wastewaters where sulphuric acid is used. Sulphate can cause:

  • Taste and health issues when present above 250 mg/L in drinking water
  • Scaling or corrosion issues which can damage equipment in water treatment, mining, or industrial processes
  • Environmental issues when discharged to rivers or lakes, or when injecting into an aquifer

Sulphate discharge limits vary between countries, when being discharged to the environment, with most countries opting for a limit in the range of 250-1000 mg/L.

Our Solutions

Clean TeQ Water’s sulphate removal technologies provide affordable treatment for groundwater, mining/industrial water and the oil & gas industry. We provide customised flowsheets with a range of technology options for sulphate removal. The moving beds used by our ion exchange technologies such as DESALX® often allow us to create gypsum based solids as the only waste product when removing sulphate, providing customers an affordable zero liquid discharge solution.

In some cases, a combination of our CIF® (continuous ionic filtration) technology with either nanofiltration or reverse osmosis is a more suitable option to meet the client’s water treatment targets. In these flowsheets a HIROX® configuration is typically used, and the brine from the membranes is used for chemical free regeneration of the ion exchange pre-treatment step.

Oman clean 1 2
Clean TeQ Water’s sulphate removal plant in Oman

Our Benefits

Our sulphate removal flowsheets offer a range of benefits:

  • High water recovery (typically >90%) and selective sulphate removal
  • Low capital and operating costs
  • Minimum waste volumes and zero liquid discharge capability
  • Highly robust systems with no scaling/fouling issues
  • Easy operation and maintenance

Case Study

Gold Mine, Australia

gold mine

Clean TeQ Water installed an 80m3/h (2MLD) water treatment plant that uses arsenic/antimony precipitation, followed by our DESALX® technology to achieve a water quality suitable for managed aquifer recharge (MAR). DESALX® reduces the hardness and sulphate concentrations of the water to meet the quality required. When additional process water is required, the softened water is treated by RO, which achieves much higher water recovery, time between cleans, and longer membrane life as a result of the DESALX® treatment. Water recovery for the DESALX® plant is in excess of 90% and the system provides consistent water quality across a range of flowrates.

SpeciesUnitFeed WaterProduct Water
pH4.56.0-9.0
Total Dissolved Solidsppm7,4005,848
Calciumppm30085
Magnesiumppm32196
Sulphateppm1515700
Iron (soluble)ppm50.1

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