Produced water management and disposal challenges are growing, along with the increased production of oil and gas wells. It is estimated that for every 1 barrel of oil produced there is 8 to 10 barrels of produced water recovered. To decrease costs associated with produced water management, water reuse and recycle technologies are implemented.
Selecting the right water treatment can be difficult as the physical and chemical characteristics of produce water change from location to location. Water treatment options differ according to the intended final use. Collected produced water can have various contaminants of concern, including high levels of iron and sulfur containing compounds such as hydrogen sulfide (H2S). These compounds can cause difficulties in water treatment, site safety issues due to odors, and corrosion problems within the treatment system.
Chemical oxidation via permanganate can be an effective option for produced water treatment, especially if lab tests point to issues with iron or sulfur. Permanganate effectively oxidizes soluble iron and manganese to insoluble precipitates which can then be removed from the water via clarification and filtration. Permanganate can also oxidize (destroy) odorous and corrosive sulfur containing compounds such as hydrogen sulfide and mercaptans.