This powerpoint presentation begins by presenting the project goal:
develop cost curves for residuals management at
water treatment plants.
The experimental process included the following:
determine residuals production based on plant
size, treatment type, and source water quality;
use production to size residual management
facilities;
two engineering firms develop cost estimates for
the facilities that were sized; and,
third engineering firm independently costs facilities
to validate cost estimates. Summary of basis for sizing includes the following:
Population Selection
- selected to cover range considered by U.S. Environmental Protection Agency (USEPA),
three values selected in 10,000 - 100,000 population range,
six values selected above 100,000, with maximum population of
1,000,000 considered;
Flow Estimates
- from analysis of WaterStats database;
average per capita flow found to be 150 gpcd;
design - average flow ratio found to be 2:1;
Residuals Production
- solids production calculated for over 4,300 WTP records in ICR
database,
high solids production defined as 90th percentile of production
from river sources,
low solids production defined as 50th percentile of production
from lake/reservoir sources. Capital Cost Summary includes the following:
the largest driver of capital costs for
residuals management facilities is the
dewatering facility; and,
pound for pound, it is less capital
intensive to treat softening residuals;
however, softening plants generate
significantly more residuals than
coagulation plants. Validation summary:
validation cost estimates generally
within 25% of cost curves;
validation cost estimates generally
higher than points on cost curves -
consistent with the increased level of
detail available in CH2M Hill's costing
tool; and,
validation shows cost curves do not
overestimate cost of constructing
residuals management facilities. Further information:
results of the costing analysis were
presented in March 2008 Journal AWWA
paper "Implementing residuals
management: Cost implications for
coagulation and softening plants" by
Roth et al;
analysis presented to USEPA in report
"Costing Analysis to Support National
Drinking water Treatment Plant
Residuals Management Regulatory
Options". AwwaRF Project #4086:
the cost curves presented here and in
the Journal article can be used to
estimate budget level costs for plants
looking to implement residuals
management: and,
AwwaRF Project #4086 "Minimizing
Water Treatment Residual Discharges to
Surface Waters" will expand on this work
to make it easier for utilities to estimate
costs of residuals management. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.5 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 36 |
| Published : | 11/01/2008 |
