Akron Water Pollution Control Station No Feasible Alternative

Table 3-1
1994 Modified NPDES Permit Effluent Discharge Limits
Discharge Limitation
Parameter 7-day 30-day Units
Monitoring Station 602 – Final Settling Tank Effluent
Total Suspended Solids (TSS) 23 15 mg/l
Nitrogen (NH3-N) mg/l
June-September 2.3 1.5 mg/l
March-May, October-November 7.1 4.8 mg/l
December-February 11.3 7.5 mg/l
Phosphorous (P) 1.5 1.0 mg/l
CBOD5 15 10 mg/l
Monitoring Station 603 – Primary Effluent/Secondary Bypass 1
Total Suspended Solids (TSS) --- 157 mg/l
CBOD5 --- 91 mg/l
1 Discharge to Station 603 only when plant peak influent flows exceed
110 MGD and the flow to equalization pumping capacity is being
maximized due to storm-related events and activities.
Table 3-2 summarizes WPCS performance for 2001 through 2005.
The following sections provide detailed technical data on the overall process design, and a
specific review of the secondary treatment system.
3.2. Hydraulic and Process Capabilities
Table 3-3 is a design data summary of the existing facilities including their design loading rates.
Process capacities are primarily based on the Recommended Standards for Sewage Treatment
Works 2 (Ten States Standards) although, in some cases, a process capacity based on
ASCE/WEF Manual of Practice 8 5 (MOP 8) is indicated. Table 3-3 is reprinted and updated from
the City of Akron Facilities Plan 98 6 . A detailed narrative describing each process facility
accompanies the Design Data Summary table in Section 8.5.3 of that document and may be
referenced, as needed.
The focus of this No Feasible Alternative Report is the capabilities of the WPCS secondary
treatment system in conjunction with selective utilization of the secondary bypass conduit. The
capacities of the secondary treatment system are reviewed in more detail in the following
section.
Page 3-2