Akron Water Pollution Control Station No Feasible Alternative

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• Contract 84-1 – Primary Tank Renovations, 1986 • Contract 86-3 – Monitoring & Sampling Improvements – Final Effluent Monitoring System, Permanent Sampling, 1987 • Contract 87-1 – Headworks Improvements – Bar Screen Replacement, Demolition of Chlorine Building, Raw Influent Sampling Station, Back Flow Preventor Building, 1988 • Contract 87-2 – New Plant Discharge Structure, Secondary Bypass Modifications, 1987 • Contract 87-3 – Grit Handling Improvements – Grit Collector & Screw Replacement, Grit Loading Building, 1989 • Contract 88-1A – Distributed Control System, 1992 • Contract 88-1B – Process Control Improvements & DCS I/O Installation, 1992 • Contract 109 – Final Clarifier Covers 1C & 2C, 1991 • Contract 111 – Gravity Thickener Improvements, 1992 • Contract 112 – Waste Liquor Treatment Improvements, 1993 • Contract 114 – Disinfection Improvements, 1993 • Contract 116 – Final Tank Effluent Sample Building, 1993 • Contract 118 – Activated Treatment Renovations, 1993 • Contract 120 – Final Clarifier Covers, 1993 • Contract 123 – South Waste Liquor Equalization Tank, 1993 • Contract 131 – Grease Handling Improvements, 1996 • Contract 134 – Waste Activated Sludge Thickening, 1996 • CSO Rack 40 (Cuyahoga Street) Storage Basin Project, 2006 Page 2-4
SECTION 3 EXISTING WPCS CAPABILITIES 3.1. General Presently, the Akron Water Pollution Control Station (WPCS) is considered to have a firm, preliminary treatment capacity of 210 MGD, primary treatment capacity is 150 MGD, and a 110 MGD secondary treatment capacity. It is operated as a single-stage nitrification process. Figure 3-1, following this section, presents a site plan for the Akron WPCS. Figure 3-2, following this section, is a schematic flow diagram illustrating process treatment and sludge flow at the Akron WPCS (Facilities Plan 98 6 .) The WPCS has seen numerous renovations and new processes constructed since it first began operation in 1928. Significant capital improvement projects completed over the past 20 years are listed in Section 2.3. A detailed narrative describing the major projects is provided in Section 8.5.6 of the Facilities Plan 98 6 . Numerous projects have been completed to incorporate new, more effective treatment technology into the WPCS. Examples include fine screening, storm water flow control and storage systems, fine pore aeration and effluent aeration using liquid oxygen. These projects have each contributed to improved treatment. WPCS effluent quality has consistently met National Pollutant Elimination System (NPDES) discharge limitations. Table 3-1 summarizes the current (1994) NPDES permit effluent limitations. As shown, WPCS raw influent flows averaged 78.6 MGD for 2005. The flow receiving full secondary treatment averaged 75.7 MGD. The 2005 average dry day (non-rain day) flow averaged 68.7 MGD. The average of peak, dry day flows is approximately 83.1 MGD. Although, this value includes “wet weather day” flow that is received at the plant in the days immediately following the cessation of rainfall and all snow melt impacts due to infiltration and the collection system time of concentration. (A “true” dry day peak average is likely approximately 72 MGD.) Page 3-1
Page 1 and 2: City of Akron Akron Water Pollution
Page 3 and 4: Akron Water Pollution Control Stati
Page 5 and 6: TABLES Akron Water Pollution Contro
Page 7 and 8: Akron Water Pollution Control No Fe
Page 9 and 10: SECTION 1 EXECUTIVE SUMMARY The pur
Page 11 and 12: SECTION 2 INTRODUCTION 2.1. NFA Rep
Page 13: 150 MGD due to their hydraulics. Th
Page 17 and 18: Month Raw Influent Flow Table 3-2 2
Page 19 and 20: Table 3-3 (con’t) Akron WPCS Exis
Page 21 and 22: 3.3. Secondary Treatment Limitation
Page 23 and 24: The hydraulic evaluation prepared a
Page 25 and 26: • final settling tank influent di
Page 27 and 28: • The simulated 120 MGD test leve
Page 29 and 30: Table 3-4 Secondary Treatment Facil
Page 33 and 34: SECTION 4 EVALUATION OF ALTERNATIVE
Page 35 and 36: 5. Summarize high-rate treatment pi
Page 37 and 38: Table 4-4 Akron WPCS Average Influe
Page 39 and 40: For these reasons the Group 2 Alter
Page 41 and 42: effluent pumping and fine screening
Page 43 and 44: The 3-year solids production rate a
Page 45 and 46: The 120 MGD alternative requires fu
Page 47 and 48: The City of Akron has previously pe
Page 49 and 50: Type of Cost Capital O&M Present Wo
Page 51 and 52: ed), exhaust fans, and associated d
Page 53 and 54: 6. For each Rack, the minimum perfo
Page 55 and 56: Rack # CBOD Present Worth ($) Table
Page 57 and 58: CSO Control Technology Tunnels Tabl
Page 59 and 60: • 20 MG of storage located near p
Page 61 and 62: ecirculated back to the reactor tan
Page 63 and 64: Table 4-13 HRT Design/Operational C
Page 65 and 66:
is its chemical coagulant and polym
Page 67 and 68:
Secondary Treatment Alternative "No
Page 69 and 70:
Final Settling Tanks Qp = 110 MGD 1
Page 71 and 72:
High Rate Treatment Qp = 110 MGD (B
Page 73 and 74:
Membrane Filters Qp = 110 MGD (Bypa
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Modify Aeration Basins with MBR Qp
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10 MG Storage 10 MG Storage 10 MG S
Page 79 and 80:
SECTION 5 ALTERNATIVE SCREENING 5.1
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For the cost and non-cost reasons n
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enefit analysis, it is recommended
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5.3. Summary of Recommended Alterna
Page 87 and 88:
SECTION 7 BIBLIOGRAPHY 1. The Akron
Page 89 and 90:
ATTORNEY/CLIENT PRIVILEGE ATTORNEY
Page 91 and 92:
Akron Water Pollution Control Stati
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cfs cubic feet per second DO dissol
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SECTION 2 INTRODUCTION The Akron Wa
Page 97 and 98:
4. The Stress Test proceeded as fol
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SECTION 4 STRESS TEST TRIALS 4.1. S
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4.2. Simulated 144 MGD Test The pro
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Based on observations and results o
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phosphorus. The apparent ineffectiv
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Concentration (mg/l) 10.0 9.0 8.0 7
Page 109 and 110:
TABLE 4-2 AKRON WPCS STRESS TEST Si
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Page 113 and 114:
Page 115 and 116:
SECTION 5 CONCLUSIONS AND RECOMMEND
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Appendix A City-Provided WPCS Data
Page 119 and 120:
AKRON WPCS 2006 120 MGD STRESS TEST
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20-Nov-06 # 1 ML # 2 ML # 1 RAS # 2
Page 123 and 124:
20-Nov-06 # 1 ML # 2 ML # 1 RAS # 2
Page 125 and 126:
20-Nov-06 # 1 ML # 2 ML # 1 RAS # 2
Page 127 and 128:
AKRON WPC 2006 144 MGD STRESS TEST
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28-Nov-06 # 1 ML # 2 ML # 1 RAS # 2
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28-Nov-06 # 1 ML # 2 ML # 1 RAS # 2
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28-Nov-06 # 1 ML # 2 ML # 1 RAS # 2
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AKRON WPC 2006 120/132 MGD STRESS T
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5-Dec-06 # 1 ML # 2 ML # 1 RAS # 2
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5-Dec-06 # 1 ML # 2 ML # 1 RAS # 2
Page 235 and 236:
Cost Development Guidelines Appendi
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ALTERNATIVE 1C - 10 MGD SINGLE UNIT
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ALTERNATIVE 1E - 100 MGD UNITS PROB
Page 241 and 242:
APPENDIX C Secondary Treatment Pres
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annually. The effort for the 40 MG
Page 245 and 246:
Akron WPCS NFA Alternative 1 -Secon
Page 247 and 248:
Akron WPCS NFA Alternative 1 -Secon
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Akron WPCS NFA Alternative 1A 20 MG
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Akron WPCS NFA Alternative 1A 20 MG
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Akron WPCS NFA Alternative 1B 40 MG
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Akron WPCS NFA Alternative 1B 40 MG
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Akron WPCS NFA Alternative 1C 10 MG
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Akron WPCS NFA Alternative 1C 10 MG
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Akron WPCS NFA Alternative 1D 50 MG
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Akron WPCS NFA Alternative 1D 50 MG
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Akron WPCS NFA Alternative 1E 100 M
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Akron WPCS NFA Alternative 1E 100 M
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Akron WPCS NFA Alternative 1F 150 M
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Akron WPCS NFA Alternative 1F 150 M
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Akron Water Pollution Control Station No Feasible Alternative

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