The Topeka Water Treatment Plant (WTP) has been directly discharging plant residuals into the
Kansas River. The Kansas Department of Health will no longer allow discharge of lime
softening residuals and a National Pollution Discharge Elimination System (NPDES) permit will
not be issued for this discharge. CDM studied alternatives to conventional residuals processing.
The purpose of the evaluation was to provide technical analysis and evaluation of the feasibility
and cost effectiveness of processing Topeka WTP lime residuals at the North Topeka Wastewater
Treatment Plant (WWTP). The North Topeka WWTP is located on the opposite side of the
Kansas River within a mile of the Topeka WTP and has solids handling facilities with excess
capacity. Two processing alternatives were evaluated for the North Topeka WWTP. A third
alternative addressed consolidating wastewater plant sludge at a second Topeka WWTP freeing up
the North Topeka WWTP to solely process lime residuals from the Topeka WTP. The first alternative maintains separate and discreet water
treatment plant lime residuals and wastewater treatment plant sludge systems, handling and
processing each material separately at the North Topeka WWTP. These two waste streams
would be handled and processed separately using common equipment, buildings, and facilities.
Solids processing at the North Topeka WWTP would then produce two cake products:
wastewater sludge and lime residuals. Two disposal options are presented in this report for these
separate waste streams. One option is to landfill the dewatered lime residuals and the other
option is to use the lime residuals as an agricultural product in a land application process. Both
disposal options maintain the City's current practice of land filling wastewater sludges with no
beneficial reuse.
The second alternative, combines and processes water treatment
plant lime residuals and wastewater sludges for dewatering with disposal or beneficial reuse as
one product. Solids processed at North Topeka would then produce one cake product consisting
of combined wastewater sludges and lime residuals. Two disposal options are presented in this
report for the combined waste streams. One option is to landfill the dewatered cake and the
second option involves using the dewatered cake as an agricultural product in a land application
process.
The third alternative proposes consolidating wastewater sludge
processing at the Oakland Wastewater Treatment Plant and establishing lime residuals processing
at North Topeka. This scenario provides for the processing of lime residuals at North Topeka as
a discrete waste stream. Lime residuals and wastewater sludge disposal options remain the same
as mentioned above. Includes tables.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 320 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 06/16/2002 |
