Blackburn Wastewater Treatment Plant Upgrade Study

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Section 4.0 - Blackbum <strong>Treatment</strong> Options Nitrifying RBCs The above aerated lagoon system will be unable to produce a nitrified effluent. Therefore, if ammonia removal is required, a mechanical process such as a rotating biological contactor (RBC) must be added to treat the lagoon effluent to reduce the levels of ammonia. The process would be smaller than one needed to treat raw wastewater, as the organic loads in the lagoon emuent are significantly reduced. An RBC consists of a series of discs on which a fixed film of biological material is grown and maintained. The discs are mounted on a driveshaft, which rotates the discs through the wastewater. Oxygen is transferred to the biomass from the atmosphere during the time that the disc is out of the wastewater. An RBC can be hydraulically loaded at 0.03 - 0.08 m3/m2/d for combined BOD removal and nitrification. For separate nitrification, the hydraulic loading can be increased slightly to 0.04 - 0.10 m3/m2/d. To treat the anticipated ADWF of 1,750 m3/d, approximately 16,700 m2 of media is required. At wastewater temperatures below 12S°C, the size of the RBC must be adjusted to achieve the same levels of performance. If the wastewater temperature is as low as 4OC (lagoon effluent could conceivably be lower in this climate), the area of the media must be increased by a factor of at least 2.5. Therefore a total area required to achieve nitrification at 4OC is in the order of 42,000 m2. As the wastewater spends upwards of 20 days in a relatively shallow lagoon, the temperature of the effluent entering the RBC during the coldest periods is likely to approach 0°C. The surface area correction curves for media, below 4OC are quite steep, and it appears impractical to size an R3C in this temperature range. Nitrifying RBC Hydraulic loading rate, m3/m2/d Temperature correction factor Surface area, m2 Without temperature correction With temperature correction Number Disc diameter, m
Section 4.0 - Blackbum <strong>Treatment</strong> Options 4.6.3 Cost Estimate Lagoon System Without RBCYs Sitework Excavationberm construction, LS Manholes/chambers/pipes, LS Equipment Headworks, lagoons, chambers, LS Mechanical Headworks, lagoons, chambers, LS ElectricallInstrumeotation Headworks, lagoons, chambers, LS MisceUaneous Pumpstation Mackus Road PS, LS Subtotal Contingencies (15 percent) Engineering/Administration (20 percent) GST (3 percent) Total (without RBC) Lagoon System with RBC's for Nitrification The following listing of costs is the extra capital cost requird to include a nitrifiying R8C process at lagoon effluent temperature of 4OC. Structural TanklFRP covers, LS Equipment RBC's Mechanical Interconnecting pipework, etc. ElectricallInstrumeotation RBC motors and controls Miscellaneous Subtotal @BC) Subtotal (Lagoons) Contingencies (15 percent) Engineering/Administration (20 percent) GST (3 percent) Total (with RBC)
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BLACKBURN WASTEWATER TREATMENT PLAN
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Table of Contents SECTION TITLE PAG
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SECTION 1 STUDY BACKGROUND AND OBJE
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Section 1.0 -Project Background and
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Section 1.0 - Project Background an
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City of Prince George - Decision Wo
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City of Prince George - Decision Wo
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MINUTES OF MEETING PR~ECT NAME: Bla
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Blackburn WWTP Treatment Options Op
Page 29 and 30: Nores. Annual O&M cost for Blackbum
Page 31: Blackbum WWTP Treatment Options Opt
Page 35 and 36: APPENDIX A STANTEC CONSULTING LTD.
Page 37 and 38: 5.0 CONCLUSIONS I '\ -. 5.1 RESULTS
Page 39 and 40: CITY OF PRINCE GEORGE Forcemain fro
Page 41 and 42: Section 6.0 -Recommended Option Key
Page 43 and 44: Section 6.0 -Recommended Option Com
Page 45 and 46: SECTION 6.0 RECOMMENDED OPTION 6.1
Page 47 and 48: SECTION 5.0 EVALUATION OF OPTIONS 5
Page 49 and 50: Section 5.0 -Evaluation of Options
Page 55 and 56: Section 5.0 - Evahation of Options
Page 57 and 58: Section 3.0 - Evaluation of Options
Page 59 and 60: SECTION 4.0 BLACKBURN TREATMENT OPT
Page 61 and 62: Section 4.0 - Blackbum Treatment Op
Page 65 and 66: Section 4.0 - Blackburn Treatment O
Page 67 and 68: Initiate llt reduction program and
Page 71 and 72: Section 4.0 - Blackbm Treatment Opt
Page 77 and 78: CITY OF PRINCE GEORGE Scale= $:I00
Page 79: Section 4.0 - Blackbum Treatment Op
Page 83 and 84: :ITY Of PRINCE GEORGE Existing Chlo
Page 93 and 94: SECTION 4.0 BLACKBURN TREATMENT OPT
Page 101 and 102: Initiate Ill reduction program and
Page 105 and 106: SECTION 3.0 AUDIT OF EXISTING FACIL
Page 107 and 108: Section 3.0 -Audit of exist in^ Fac
Page 109 and 110: Section 3.0 -Audit of Existing Faci
Page 111 and 112: SECTION 2.0 III MITIGATION MEASURES
Page 113 and 114: Section 2.0 - UI Mitigation Measure
Page 115 and 116: APPENDIX E FLOW CALCULATIONS FOR SE
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Blackburn Wastewater Treatment Plant Upgrade Study

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