Sodium softening operating costs

Table 15.1 Operating costs considerations for sodium softeners and antisealant feed systems.

Operating Cost Issue Sodium Softeners Antisealant Feed System... 

Table 15.1 lists operating cost issues for sodium softeners and antisealant feed systems. The three largest expenditures listed in Table 15.1 are the salt and resin amortization for the sodium softener options and the antisealant itself for that option. To provide examples of these costs in greater detail, consider the following cases. 

The sodium softener selected to treat this water is a duplex, 150-gpm system with 54-inch diameter by 72-inch side sheet vessels. Each vessel contains 50ft3 of resin. Since the duplex system operates with one vessel on line and one vessel in stand-by, the total system regenerates 2.4 times per day. At a salt dosage of 15 pounds per cubic foot, the system uses about 1,800 pounds (820 kg) of salt per day or 27.4 tons per month, assuming a 100% operating factor. At a salt cost of 80 per ton, the total month cost for salt is about 2,200.3... 

The softener is a 48-inch diameter unit with 35ft3 of resin. The softener will regenerate once per day with 151b/ft3 of salt. At a salt cost of 80 per ton, the sodium softener would require about 638 per month to operate. 

Table 15.3 Projected operating costs for an RO pretreatment system with and without sodium softener. 

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