Warm lime softening

Warm lime softening is conducted at 120 - 140°F, where the solubilities of calcium and magnesium are reduced. Temperature control is critical. A change of as little as 4°F can cause carryover of softener precipitates. Conventional cold lime softening equipment is used for warm lime softening. 

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Warm Lime Softening. The warm lime softening process operates in the temperature range of 49—60°C. The solubiHties of calcium, magnesium, and siHca are reduced by increased temperature. Therefore, they are more effectively removed by warm lime softening than by cold lime softening. 

Table 8.10 Effluent from cold, warm, and hot lime softeners.

Lime softening can be conducted cold (ambient), at warmer temperatures, or hot, where steam is used to heat the process. The differences among the three options are in the removal of hardness, alkalinity, and silica. Table 8.10 lists approximate effluent from cold, warm, and hot lime softeners.16... 

CUP WARM WATER. ADD /i PACKAGE YEAST THAT HAS BEEN SOFTENED IN LUKEWARM WATER. PLACE BOTTLE IN A WARM SPOT. SHORTLY THE LIQUID BEGINS TO BUBBLE. LEAD THE GAS INTO LIME WATER. GAS IS CO,. IN A FEW DAYS, GAS DEVELOPMENT SLOWS DOWN. 

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