Lime softening

Is limescale harmful in drinking water? Should you drink softened water? What is lime used for in water treatment?

The process is also effective at removing a variety of microorganisms and dissolved organic matter by flocculation. Lime Softening Lime Softening.

Chemical precipitation is one of the more common methods used to soften water. Chemicals normally used are lime (calcium hydroxide, Ca(OH) 2) and soda ash (sodium carbonate, Na 2CO 3). Soda ash is used to remove chemicals that cause non-carbonate hardness. Reduce the amount of calcium and magnesium in your feedwater and minimize scaling with our lime-softening technologies that precipitate out hardness and remove harmful microorganisms, dissolved organic matter, and other materials such as iron, manganese, radium, and arsenic.

The goal of all of these reactions is to change the calcium and magnesium compounds in water into calcium carbonate and magnesium hydroxide, which are the least soluble compounds and thus will settle out of the water at the lowest concentrations. In enhanced softening , the pH is increased further in a second stage, to at least 10. Ecodyne offers a wide variety of custom designed water treatment equipment, and therefore can be the sole source for all your water treatment needs.

We supply lime softeners to the oil sands and we are an exclusive supplier of hot lime softeners for the SAGD process. The solubilities of calcium, magnesium, and silica are reduced by increased temperature. Therefore, they are more effectively removed by warm lime softening than by cold lime softening. Our lime-softening solutions can easily present a win-win scenario for companies looking to significantly lower the amount of total dissolved solids (TDS) in their feed and wastewater while improving production and reducing cost.

Although lime softening isn’t the ideal solution for every hardness and scaling challenge,. In lime softening , there is a substantial reduction in total dissolved solids (TDS). In ion exchange softening (sometimes referred to as zeolite softening ), there is no significant change in the level of TDS.

It has several advantages over the ion-exchange method but is mainly suited to commercial treatment applications. Ion – exchange softening. Could have higher operating costs.

The total solids, alkalinity and silica contents of the raw water are not reduced. A problem encountered with cation exchange on the hydrogen cycle is corrosion from acidity of the effluent. This does not apply for standard sodium exchange softeners.

The two-stage, excess lime softening process provides the most complete softening. It might seem counterintuitive to add calcium to water in order to remove calcium from water, but the process uses chemical reactions in a high-pH environment to form calcium compounds that precipitate into solids, which can then be filtered out. Caustic soda softening is typically used when the treated water has inadequate carbonate hardness to react with lime.

The process decreases the acidity that is associated with the minerals in the hard water. Despite all the benefits of lime softening there are also some adverse effects. Simultaneously, it increases the Langelier Saturation Index (LSI),. At the site, the oil removal filter influent is between 1ppm and 3ppm with an effluent less the ppm oil and solids.

After lime softening water treatment, the softener is then used for solids removal and polishing before ion exchange. The softener effluent is consistently less than ppm TSS. Sketch a drawing of a typical lime softening facility, identifying processes and points of chemical addition in the appropriate order for each of the following: 1. Solids contract unit Differentiate between gravimetric and volumetric dry feeders. Smaller-scale systems and point-of-entry systems often use anion exchange resins or activated alumina.

A water softening experiment was conducted in replicate to observe the changes in parameters such as total hardness, calcium hardness, magnesium hardness, alkalinity and pH with varying dosages of lime.