Technologies and Costs for Removal of Arsenic From Drinking Water

3.2.3.2 Water Model1. The Water model output for a 0.27 mgd (270,000 gpd) package conventional treatment(coagulation/flocculation/filtration) plant is $692,066 (escalated to 1998 dollars).2. Using the capital cost breakdown in Table 3-4, the total process cost is:$692,066 x (0.4136 + 0.0132 + 0.0752 + 0.0415) = $376,1383. The modified capital cost can then be calculated using the total cost factor presented inTable 3-1.$376,138 x 2.5 = $940,3454. This approach must be applied to each unit process (e.g., backwash pumping) separately,then totaled for the entire treatment process to estimate the modified capital cost.5. When housing costs are included for a unit process, they are added after multiplication ofthe process cost by the TDP total cost factor (2.5 in this example). Table 3-4 showshousing is 16.3 percent of the construction cost. The total capital cost is:($692,066 x 0.1630) + $940,345 = $1,053,1523.2.3.3 W/W Cost Model1. The W/W Cost model output for a 1 mgd (1250 ft 2 ) rectangular sedimentation basin is$416,574 (escalated to 1998 dollars).2. Using the capital cost breakdown in Table 3-6, the total process cost is:$416,574 x (0.2311 + 0.0855 + 0.2190 + 0.1066 + 0.0201) = $275,8973. The modified capital cost can then be calculated using the total cost factor presented inTable 3-1.$275,897 x 3.33 = $918,737.4. This approach must be applied to each unit process separately (e.g., acid feed), thentotaled for the entire treatment process to estimate the modified capital cost.3.2.4 Cost Indices and Unit CostsBoth the Water Model and the W/W Cost Model require a number of standard indices andvarious unit costs from the Bureau of Labor Statistics, the Engineering News Record, and other3-8