Product/Service

Acidic Wastes Neutralized Economically with Lime

Source: Engineering Resource, Inc.

Lime (calcium hydroxide) is an economical alternative for neutralization of acids in wastewater streams
Lime (calcium hydroxide) is an economical alternative for neutralization of acids in wastewater streams. It is available as a powder or slurried in water.

This table lists the approximate cost of using lime relative to that for other popular alkaline neutralizing agents:

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Alkaline                                          relative cost 

Reagent                      

Calcium hydroxide (lime)                            1

Magnesium hydroxide (magnesia)               4

Sodium carbonate (soda ash)                     5

Sodium hydroxide (caustic soda)                7

Potassium Hydroxide                                15

Despite its low cost, the use of lime is often avoided because its successful application presents greater engineering challenges.

ERI offers a bulletin discussing the engineering considerations when using lime to neutralize wastewater.

Engineering Resource, Inc., 19 Edgehill Road, Winchester, MA 01890. Tel: 781-938-1074; Fax: 781-938-1075.