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1. Straight lime softening A groundwater was analyzed and found to have the following composition (all concentrations are as CaCO3 ). Estimate the lime dose

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1. Straight lime softening A groundwater was analyzed and found to have the following composition (all concentrations are as CaCO3 ). Estimate the lime dose (in mg/L ) required to soften the water. H2CO3=155mg/lCa2+=210mg/lMg2+=15mg/lAlk.=260mg/lTemp=10C 2. Excess lime softening A groundwater was analyzed and found to have the following composition (all concentrations are as CaCO3 ). Estimate the lime dose (in mg/L ) required to soften the water. H2CO3=155mg/lCa2+=180mg/lMg2+=60mg/lAlk.=260mg/lTemp=10C

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