AWWA ACE56166

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.

Product Details

Edition:

Vol. - No.

Published:

06/16/2002

Number of Pages:

10

File Size:

1 file , 320 KB