Biomedical Engineering Reference
In-Depth Information
Table 11.7. (continued)
Cost Element
EISB Cost ($)
Annual Monitoring Costs (6-30 years)
Labor
2,500
Analytical, groundwater
5,000
Reports
5,000
Total monitoring (per year)
12,500
Table 11.8. EISB Cost Summary for Case 3
Cost Element
EISB Cost
Total design costs
$80,000
Total capital costs without bioaugmentation
$142,000
Design and capital cost for bioaugmentation
$18,000
NPV of total O&M costs (assumed for 5 years)
$431,000
NPV of total monitoring costs (assumed 10 years)
$302,000
NPV of total cost (5 year O&M and 10 year
monitoring)
$970,000
Bioaugmentation costs as a percentage of NPV
total cost
1.9%
bacteria.Monitoring costs constitute only about 30%of the total cost for this remedy (versus about
45% for Case 2) since the costs to implement and operate the remedy increase more than the extra
cost to monitor a larger system. As with the biobarrier in Case 2, the cost to include bioaugmenta-
tion as part of the implementation is relatively small, about 1.9% of the total cost of the remedy.
11.6 SUMMARY
The key potential economic benefits of bioaugmentation are: (1) reduction in the time
required to achieve complete dechlorination of chlorinated solvents (or complete degradation
of other target compounds), thereby reducing the overall costs for injection of electron donor
and reducing groundwater monitoring costs; (2) reduction in regulatory oversight by achieving
treatment objectives sooner; (3) reduction in the time required to return the groundwater to
beneficial use by achieving treatment goals in a shorter period of time; and (4) ability to apply
EISB at sites where this approach would otherwise not be effective and where other more
expensive approaches would be required. These benefits will be realized at sites where suitable
microorganisms are not present or are present at low initial concentrations. If the remediation
objectives for a site dictate that biodegradation needs to be initiated in a short timeframe,
bioaugmentation can provide a significantly greater assurance that the objectives will be
achieved.
A rough planning level cost estimate for bioaugmentation has been developed based on the
information presented in this chapter. Assuming that 1 L of culture is used to bioaugment
35,000 L of groundwater, the culture costs $200/L to purchase and $100/L to inject, and the
porosity is 30%, the cost to bioaugment this site would be $2.60/m
3
of aquifer. These costs are
Search WWH ::
Custom Search