Langham is a community of approximately 1,400 people located northwest of Saskatoon. Over the past 10 years, the Town has been developing a strategy to replace their existing 40-year old wells, and upgrade the local treatment plant. The Town secured the necessary funding to design a new water treatment plant to better serve the community’s needs. Langham’s old plant targeted the iron and manganese removal; however, high levels of hardness and sulfate remained in the water distributed to the community.
The treatment process is an integrated system consisting of forced draft aeration, chemical addition, detention, pressure filtration, and nanofiltration. Tonka Water supplied the three major pieces: the forced draft aerator, VertaCell™ pressure filters, and a Flux RO/NF™ nanofiltration unit, along with a treatment process guarantee. By having a single supplier, Langham operators were confident of their new treatment plant.
The treatment process begins by pumping well water to the forced draft aerator where the water is atomized through spray-cone nozzles, facilitating air/water contact to oxidize the iron. Following aeration, potassium permanganate is added oxidizing the manganese present in the raw water, then flowing to the detention basin where the oxidation reactions complete, forming the iron and manganese into filterable particles. The water is then pumped through VertaCell™ filters to remove the iron and manganese particles before flowing to the Flux RO/NF™ membrane unit. A portion of the full flow rate bypasses the Flux RO/NF™ membrane unit, and instead blends with the water treated by the unit. The proportion of water bypassed around the membrane can be adjusted to achieve the desired hardness concentration in the finished water.
The treatment process has been highly effective in delivering quality water in compliance with Saskatchewan Environment guidelines.
|Iron (Fe)||2.1 mg/L||<0.3 mg/L|
|Manganese (Mn)||0.77 mg/L||<0.5 mg/L|
|Hardness (CaCO3)||756 mg/L||blended to 100 mg/L|
|Sulfate (SO4)||394 mg/L||blended to 58 mg/L|