Pollution Prevention and Control Technologies for Plating
Section 3 - Chemical Recovery
3.2 ATMOSPHERIC EVAPORATORS
220.127.116.11 Capital Costs
The basic equipment cost for atmospheric evaporators is relatively
low. However, all installations will experience some installation
costs and most installations will require auxiliary equipment.
The most common and significant installation cost is for exhausting
the air exiting the evaporator. Ductwork must be run to either
to an existing ventilation duct or, more frequently, through a
roof penetration. Other installation work includes connecting
power and water to the evaporator, rearranging of other equipment
or tanks, installation of controls and installation of a transfer
tank. Auxiliary equipment may include, for example, a transfer
tank, additional recovery rinse tanks, an additional heat exchanger
or a DI water system.
Capital cost estimates for atmospheric evaporators are shown in
Exhibit 3-7. These costs are presented as a function of evaporative
capacity (gph) over a range of process solution temperatures (either
the process tank or transfer tank, whichever is fed to the evaporator).
Exhibit 3-7 shows the basic equipment costs, which were derived
by taking the median costs from the three vendor survey respondents
(where a single evaporator is unable to provide the desired evaporation
capacity, multiple units were assumed). The installed capital
costs are approximately 180% of the basic equipment costs (based
on Users Survey data).
Exhibit 3-7. Equipment Costs for Atmospheric Evaporators as
a Function of
18.104.22.168 Operating Costs
The major operating costs for atmospheric evaporators include
O&M labor and energy. Estimates of these operating cost components
are shown in Exhibit 3-8. From the Users Survey, the average O&M
labor is 157 hrs/yr. In constructing the operating cost graph,
it was assumed that this level of labor is adequate for a unit
evaporating 15 gph, 24 hrs/day for 260 day/yr. The energy cost
shown in Exhibit 3-8 is for replacement heat in the process tank
and for operating a pump. The energy cost does not account for
energy loss due to ventilation of shop air during winter months.
Exhibit 3-8. Operating and Maintenance Costs for Atmospheric
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