Benefits of Lime Softening for Municipal Waterworks Sourcing Groundwater

Municipal waterworks generally choose water softening treatment methods as a function of cost, water quality, infrastructural capacity, and the degree of hardness the customers demand. As a rule, lime softening water treatment works best in systems that source groundwater with low to undetectable non-carbonate hardness levels. Softening water with high non-carbonate hardness may necessitate the combination of lime and soda ash. In either case, lime softening is ordinarily more economical than the alternative method of water treatment with caustic soda.

M.W. Watermark - Filter Presses for Lime Softening Water Treatment Application
Two M.W. Watermark 1500mm Filter Presses

Benefits of Lime Softening

Lime softening water treatment not only effectively reduces the dissolved mineral quotient in municipal and industrial water supplies but it also directly and positively impacts municipal, commercial, and consumer budgets. Because softened water tends to form less scale, consumers use fewer household cleaners, which in turn reduces the toxic chemical content of municipal greywater. As a result, filter presses at greywater treatment plants, and industrial efforts like laundry wastewater recycling, operate more efficiently and cost-effectively.

Other potential plusses of lime softening water treatment include the removal of heavy metals, radioactive elements, and other toxins such as radium 226 & 228, uranium, and arsenic. Lime softening eliminates iron, manganese, silica and fluoride, as well as certain organic compounds and possibly even Giardia lamblia cysts. Lime softening water treatment reduces total organic carbon (TOC) content and surface water turbidity. Simultaneously, it increases the Langelier Saturation Index (LSI), which in some cases can aid in pipe corrosion control.

Innovative, Eco-Sustainable Cake Disposal

Proper disposal of the filter press cake produced by lime softening is strictly regulated and often costly. One uniquely beneficial disposal solution is the recycling of the filter cake as agricultural fertilizer. This calcium-rich product can then be distributed or monetized either to restore the pH balance in poor or depleted soil to promote plant growth or as a liming material for farmers.

In states where abandoned strip mines leach acid water into the watershed, pumping a solution containing filter cake from lime softening water treatment into the mines can help abate environmental pollution downstream—by neutralizing the acid water at the source of contamination. In this way, governments can reclaim blighted land to provide economical discharge storage to save on material treatment costs, while at the same time helping to conserve local water resources by reducing pollution—all long-term, cost-saving benefits.

Contact M.W. Watermark to learn more about lime softening water treatment.

About M.W. Watermark

M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.

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Benefits of Lime Softening for Municipal Waterworks Sourcing Groundwater