North Side WRP Master Plan Research and Development Department 2006 Seminar Series October 27, 2006 Metropolitan Water Reclamation District of

Transcription

1 North Side WRP Master Plan Research and Development Department 2006 Seminar Series October 27, 2006 Metropolitan Water Reclamation District of Greater Chicago

2 Today s Goals Discuss project background Provide an overview of evaluation results Outline recommended plan

3 Content of Presentation Objectives and Guiding Principles Current and Future Conditions Liquid Handling Solids Handling Site Planning Recommended Plan

4 Objectives and Guiding Principles

5 Objectives and Guiding Principles Assess future flow and loads Study major needs to year 2040 Consider escalating energy costs and stricter effluent limits

6 Objectives and Guiding Principles (cont.) Establish prioritized capital projects for next 20 years (year 2026) Comment on needs beyond year 2026 Standardize equipment among all WRP s where practical

7 Current and Future Conditions

8 NORTH SIDE Service Area Service Area: Sq. mi. Water Reclamation Plants Chicago City Boundary Waterways Cook County Population Served: 1,349,392 (2000) Service Areas North Side WRP Design Average Flow: 333 MGD

9 Population Trend Line Number of People (in thousands) 1,480 1,460 1,440 1,420 1,400 1,380 1,360 1,340 1,320 1,300 1,280 1,260 1,240 NIPC Population Projected 2040 Population 1,392,000 1,262,000 1,271,000 1,349,392 1,258,745 Approximate trend line (excluding 1970 population) 1,468,000 1,438, Year

10 Population and Flow Projection Year Population Annual Average Flow, MGD Gallons Per Capita ,349, ,468,

11 Land Use Evaluation Obtained land use map from NIPC Extracted acreage for year 2000 Estimated flow based on gallons / acre Estimated land use for year 2040 assuming build-out of developable land

12 Land Use Projections Green area are open space or agricultural Limited undeveloped property

13 Year 2040 Flow Projections Population method: 282 MGD Land Use method: 287 MGD Current permitted rating: 333 MGD Conclusion: Use 333 MGD annual average for master planning evaluations Assume no net change in I/I over planning period Assume no change in raw sewage characteristics over planning period

14 Summary of Data (10% outliers excluded) Parameter Unit Min Day Annual Avg Max Month Max-week Max Day Flow mgd tpd BOD 5 mg/l tpd CBOD 5 mg/l TSS tpd mg/l NH 3 -N tpd mg/l TKN tpd mg/l TP tpd mg/l

15 Year 2040 Projected Influent Flow and Loads Parameter Unit Min Day Annual Avg Max Month Max-week Max Day Flow mgd tpd BOD 5 mg/l tpd CBOD 5 mg/l TSS tpd mg/l NH 3 -N tpd mg/l T K N tpd mg/l T P tpd mg/l

16 Current and Projected Monthly Average Permit Limits Parameter Current Possible Future Year 2040 Total Phosphorus (mg/l) No standard Total Nitrogen (mg/l) No standard 6.0 to Carbonaceous BOD 5 (mg/l) Total Suspended Solids (mg/l) Ammonia-Nitrogen (mg/l) 2.5 (summer); 4.0 (winter) 2.5 (summer); 4.0 (winter) 1.5 (summer); 3.0 (winter) E. coli (cfu/100 ml) No standard 400 cfu/100 ml cfu/100 ml 5 Potential permit limits were considered for space planning only and are not to be interpreted as acceptance by the District.

17 Existing Treatment Capacity Evaluation Results Based on Design Criteria Item Primary Settling SOR (annual avg.) SOR (peak hourly) Aeration Tank HRT (annual avg.) Organic Loading, BOD 5 /1,000 ft 3 /day Final Settling SOR (peak hourly) SLR (peak hourly) Design Guideline Ten-States 1,000 gpd/sf 2,000 gpd/sf IEPA 8 hours 15 annual average IEPA 1,000 gpd/sf 50 ppd/sf Plant Influent Flows at which design guidelines exceeded, MGD

18 Existing Treatment Capacity Evaluation Results - Based on NSWRP Baseline Model (10% Capacity Out of Service) Item Monthly Average CBOD 5 TSS NH 3 -N, winter Weekly Average CBOD 5 TSS Daily Maximum NH 3 -N, winter Current Permit Limit, mg/l Plant Influent Flows at which model predicted permit violations, mgd

19 Liquid Handling

20 Unit Processes Considered Raw Sewage Pumping Screening Grit Removal Primary Tanks Aeration Tanks / Nutrient Removal Aeration Blowers Final Tanks Tertiary Treatment (for space planning only) Disinfection (for space planning only)

21 Raw Sewage Pumps RAW SEWAGE PUMPS

22 Existing Raw Sewage Pumps - Existing 6 Constant Speed Capacity: n MGD n MGD Objective: 450 MGD w/ flexibility

23 Raw Sewage Pumps Recommendation Replace Impellers in Small Pumps w/ New Motors and VFD s Benefits: Improves Reliability Wide Range of Flow VFD enables automatic control Replace Impellers in Pumps No. 3 & 4 w/ new Motors and VFD s Meets 450 mgd w/ one VFD pump and P-5 or P-6 out of service

24 Screening SCREENING

25 Existing Screens Climber Type Coarse Screens 3.5 Clear Spacing Fine Screens 0.5 Clear Spacing

26 Screening Recommendation Replace Coarse Screens w/ 1.5 clear spacing; continue to maintain existing fine screens Benefits: Improves reliability Minimizes solids build-up in grit tanks Replace existing coarse climber screens

27 Grit Removal GRIT BUILDING

28 Grit System - Existing Aerated Grit Tank Dewatering w/concrete wash tank or cyclones & classifiers

29 Grit System Recommendation Continue to maintain aerated grit system; provide redundant wash tank Benefits: Improves reliability Minimizes need for cyclones and classifiers Provides redundancy

30 Primary Tanks PRIMARY TANKS

31 Primary Tanks at 1,000 gpd/sf Conceptual Sketch Considered a range of loading rates from 1,000 to 2,000 gpd/sf

32 Primary Tanks - Existing Square Tanks Circular Tanks Square Tank w/ side feed 8 Square 80 x 80 x 14 center water depth dia w/ center water depth Total Surface Overflow Rate (SOR) 2,270 current average 259 MGD

33 Primary Tanks Recommendation Provide 8 new Primary 100 diameter; maintain existing circular tanks 8 new Primary 100 dia Benefits: Eliminates inefficient square tanks Improves hydraulic flow splitting Provides 2,000 gpd/sf

34 Aeration Tanks / Nutrient Removal D C B A AERATION TANKS

35 Aeration Tanks - Existing D C B A 4 Batteries w/ Total 68 million gallons Hydraulic Retention Time, 259 MGD current annual average flow, 6.3 hours Single stage nitrification, plug flow Silica / Alumina plate type diffusers

36 Aeration Tanks Recommendation Increase HRT for minimum 7.2 hours; continue with alumina / silica plate diffusers; improve D.O. control Benefits: Improves reliability Greater flexibility to meet maximum flow and loads

37 Aeration Blowers - Existing Replace existing with new centrifugal units

38 Future Nutrient Removal Considered for planning future space requirements only Plan for lower TP and TN limits Evaluate impacts on existing system

39 Nutrient Removal Recommendations For effluent TP = 1.0 mg/l, use ferric chloride addition For effluent TP = 0.5 mg/l and TN in the range of 6 to 8 mg/l, use ferric chloride addition with 4-stage Bardenpho BNR process with tertiary filters

40 Nutrient Removal Potential BNR Processes Other BNR processes have similar HRT s Primary Effluent (Q) Internal Recycle (Q IR ) Anoxic Zone Aerobic Zone Anoxic Zone Aerobic Zone FeCl 3 Addition Final Clarifiers Effluent Return Activated Sludge (Q RAS ) Effluent Filters Waste Activated Sludge Four-stage Bardenpho w/ chemical addition and filtration Nutrient removal was considered for planning purposes only and are not to be interpreted as acceptance by the District

41 Final Tanks FINAL TANKS D C B A

42 Final Tanks - Existing 4 Batteries difficult to control flow split proportionally Surface Overflow Rate, 450 MGD peak flow ± 1,240 gpd/sf depending on flow split 40 square 77 x 77 x 14.5 side water depth (SWD) diameter, 15 SWD; diameter, 15 SWD; diameter, 14.5 SWD (Battery D) Battery A, B, & C experience biological bulking on occasion Battery D functions more efficiently than Battery A, B, & C

43 Final Tanks - Recommendations Improve flow splitting to proportion flow equally Upgrade for SOR of 1, MGD peak Use circular 110 diameter minimum

44 Solids Handling

45 Solids Handling Facilities CONCENTRATION TANKS SLUDGE PIPELINE TO STICKNEY WRP

46 Concentration Tanks - Existing Rectangular Tanks Circular Tanks 2 Rectangular x 70 x 14 SWD 1 Circular 70 diameter w/ SWD Solids concentration varies between 1.1 to 1.4 % Tanks function as holding tanks w/ minimal thickening

47 Concentration Tanks Recommendation Provide 2 new 70 diameter concentration tanks Benefits: Improves flexibilty 2 new concentration 70 dia Arrange to thicken primary sludge & blend w/ WAS

48 Recommendation Inspect / test existing pipeline prior to new pipeline Benefits: Enable pressure up 100 psig Reduce pipeline maintenance Approx. 18 miles Provides improved solids handling flexibility

49 Site Planning

50 Available MWRDGC Property Oakton St. Skokie Golf Center (leased) Metra OK Com Ed McCormick Blvd Skokie Park (leased) OK North Shore Channel OK Howard St.

51 Potential Conceptual Site Plan utilize existing south site (including west ball park) Legend: Infrastructure Improvements TP = 1.0 mg/l, E. Coli = 1,030 cfu/100 ml TP = 0.5 mg/l, TN = 6 mg/l, E. Coli = 400 cfu/100 ml TP = 0.5 mg/l, TN = 5 mg/l, E. Coli = 400 cfu/100ml Demolition/Decommission Considered for future space planning only Battery F & H FSTs Battery D & G FSTs Sludge Concentration Tanks Pump Station and Wet Well Battery G Filters Battery E Internal Recycle Pump Station (Typ.) Battery H Battery F PSTs FeCl 3 Grit Chamber Sludge Pipeline Disinfection Pump and Blower House Relocated Service Building

52 Potential Conceptual Site Plan Two-plant operation (south and north) Legend: Infrastructure Improvements TP = 1.0 mg/l, E. Coli = 1,030 cfu/100 ml Battery E TP = 0.5 mg/l, TN = 6 mg/l, E. Coli = 400 cfu/100 ml TP = 0.5 mg/l, TN = 5 mg/l, E. Coli = 400 cfu/100ml PSTs New Headworks and Blowers Demolition/Decommission Internal Recycle Pump Station (Typ.) Pump Station and Wet Well FSTs Filters Battery F FSTs Disinfection FeCl 3 Grit Chamber Pump and Blower House Battery F PSTs Sludge Concentration Tanks Sludge Pipeline

53 Proposed Site Plan to Year 2026 New Battery E New Road Demolition/Decommission New Final Settling 130 Dia. Each (8 Typ.) Phase I Phase II Phase III New Primary Settling 130 Dia. Each (4 Typ.) Sodium Hypochlorite Feed Point Modifications Phase IV North Site base loaded at 105 MGD New Final Settling 110 Dia. Each (24 Typ.) Battery C Battery D New Final Settling 110 Dia. Each (8 Typ.) New Battery F Battery B Battery A Sludge Concentration Tanks Grit Dewatering Existing Primary Settling Tanks to Remain Existing Pump and Blower House New Degritted Primary Effluent Pump Station New Primary Settling 100 Dia. Each (8 Typ.) Coarse Screens New Sludge Pipeline

54 North Side Water Reclamation Plant Master Plan (Tentative) Near-Term Projects: Construction Budget Costs Start Raw Sewage Pump Upgrades Piping to Battery E and Degritted Primary Influent Pump Station Existing Sludge Pipeline Testing and Repair; and New Sludge Pipeline Aeration Blower Upgrades New North Battery E and North Site Primaries Sludge Concentration Tank Improvements Grit Dewatering Modification and Sodium Hypochlorite Feed System/Feed Point Modifications $3,000,000 $64,000,000 $90,000,000 $19,000,000 $315,000,000 $18,000,000 $3,000,

55 North Side Water Reclamation Plant Master Plan (Tentative) Mid-Term Projects: Addition of New South PSTs; Primary Influent Distribution and Plant Drain Improvements New Battery F Budget Costs $44,000,000 $179,000,000 Construction Start

56 North Side Water Reclamation Plant Master Plan (Tentative) Long-Term Projects: Demolition of Square PSTs; Addition of New North PSTs; and Plant Drain Improvements Battery C Improvements: FST Replacement; Diffuser Replacement; Air and Flow Distribution Improvements; Aeration Tank Repairs; Air Lift Pump Replacement; and Plant Drain Improvements Battery B Improvements: FST Replacement; Diffuser Replacement; Air and Flow Distribution Improvements; Aeration Tank Repairs; Air Lift Pump Replacement; and Plant Drain Improvements Construction Costs Start $31,000, $87,000, $87,000,

57 North Side Water Reclamation Plant Master Plan (Tentative) Long-Term Projects: (cont.) Construction Battery A Improvements: FST Replacement; Diffuser Replacement; Air and Flow Distribution Improvements; Aeration Tank Repairs; Air Lift Pump Replacement; and Plant Drain Improvements Battery D Improvements: Diffuser Replacement; Air Distribution Improvements; and Air Lift Pump Replacement Coarse Screen Replacement Submetering and Miscellaneous Electrical Upgrades Budget Costs $87,000,000 $15,000,000 $8,000,000 $2,000,000 Start

58 Questions??