6.
Prepare technical memorandum summarizing projected growth in residential,
commercial, industrial, and institutional flows. Meet with City staff to review and
finalize memorandum.
D. Analyze WWTF Effluent Quality and Sludge Quantities
12/10/19
1,
Analyze primary treatment removal rates for BOD and TSS and typical effluent
quality both in terms of concentration and mass loading. Summarize available data
on primary sludge quantities and compare to predicted values based on removal
rates.
Analyze available data on primary effluent nitrogen and phosphorus levels. If
necessary, develop a plan for supplemental nitrogen and phosphorus monitoring to
be conducted by the City (WP has budgeted an allowance of $7,500 for outside lab
effort). Develop a preliminary estimate of nitrogen and phosphorus loadings based.
on. best available information.
Analyze the performance of the secondary system in terms of flows treated, BOD
and TSS removal rates and typical effluent quality in terms of concentration and
loading.
For conditions when the secondary bypass is activated, analyze BOD and TSS
concentration and loading in primary effluent, secondary effluent, and combined
effluent.
Assess discharge permit compliance for the main WWTF both on days with no
secondary bypass and with secondary bypass including BOD and TSS
concentration and loading and effluent disinfection parameters.
Develop a summary of secondary sludge quantities.
Analyze sludge thickening operations for primary and secondary sludges including
capture rates and typical thickened sludge concentrations, flow and _ solids
quantities.
Analyze anaerobic digester performance in terms of solids loading rates, solids
destruction, and gas production.
4 Wright-Pierce
