The Brightwater Influent System
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1 Something Old, Something New: Redirecting an Existing, Operating Influent System to Serve a New Treatment Plant The Brightwater Influent System William Cranston MWH-Jacobs Assoc. Joint Venture Department of Natural Resources and Parks Wastewater Treatment Division
2 The Problem How to modify the existing Brightwater influent conveyance system to serve the new treatment plant when the existing system Is designed to transport flows in the opposite direction cost effectively; maximizing used of existing facilities; maintaining all current flexibility; while keeping all facilities operating?
3 Outline Background Existing Influent System Constraints/Criteria The Influent System Modifications Control Strategy Development Emergency Operations Control System Overview Project Status Results
4 Existing King Co. Wastewater Service Area 34 customer agencies 1.5 million people served 420 square mile service area 206 MGD average annual system flow 4 existing WW treatment plants and 4 CSO plants 353 miles of conveyance pipe with 42 pump stations and 19 regulator stations
5 Brightwater Treatment System Flows from Redmond, Bellevue, Woodinville, Bothell, and Kenmore directed to Brightwater Est. 320,000 people served 4 pump stations affected 7 major interceptors rerouted
6 Brightwater Treatment Plant N Wetlands/ Forested Admin/Operations Liquids Odor Control Solids
7 Brightwater Effluent System PLAN PROFILE
8 Existing Influent System County GIS graphic?
9 Existing Flow Routing Dry Weather: Wet Weather:
10 Stakeholder Requirements Staffing limitations require maximum automation All flows must remain within Brightwater system for treatment (permit requirement) Phased operation: existing flow routing until 2011, then switch to final routing Integrated with existing control system Compatible with new Ovation control system Strong public sensitivity to overflow risks based upon past occurrences
11 Guiding Principles Flows treated/stored in Brightwater System until capacity reached All secondary treatment options must be exhausted before primary discharge is allowed Storage is preprogrammed and automatic unless operator intervenes Diversion to other treatment system automated upon specific emergency events
12 Critical Design Issues No emergency bypass overflow; storage sequence and use critical to preventing spills Continuous operation during construction, with switchover up to 3 years after completion Influent Pump Station design by others, requiring close coordination Storage dispersed in the system, requires programming based on flow rates to maximize storage
13 Design Criteria Low Flow: ½ ADWF = 7.7 MGD Average Wet Weather Flow: 36 MGD 20-year peak hour design flow: 55 MDG Swamp Creek Diversion 115 MGD North Creek Diversion Keep all flows within Brightwater System up to peak 1-hour flow from 20-year storm (pumping and storage)
14 Brightwater Influent System Design Tunnel backbone Pump station modifications New Conveyance elements
15 Brightwater Influent System
16 Pump Station Modifications Hot/cold standby Pump modifications Control system changes Reclaimed water system
17 New Conveyance Elements New Diversion Connector Portal Structure Influent /Storage Tunnel Connector Odor Control New Diversion Structure Exist. Diversion Mods York and Hollywood Diversion changes Odor and Corrosion Control
18 Key Features Hot/cold standby and ventilation modifications reduce energy consumption Early activation based on storage level and/or rates of fill provides margin of safety Operator transition to cold standby to allow washdown Operator override allowed at all times Maintains flow routing flexibility
19 Control Strategies Phase 1 for operation prior to Brightwater system online Phase 2 for operation with Brightwater system online Automatic normal operation up to 170 MGD with IPS and Treatment Plant operating Emergency operation for excess flows or in case of IPS/Treatment Plant problems
20 Phase 1 Operations Control strategies for new diversion structures and modifications to existing Revised flow routing New gates Replacement gates New level sensors New Bioxide injection system and generator at Hollywood Pump Station New odor control system at North Creek Pump Station
21 Final Influent System Operations Normal Operation: Flows to Brightwater WWTP Storage for excess flows Emergency Operation: All possible flows to Brightwater WWTP Storage for excess flows Routing to other treatment systems when capacities exceeded
22 Emergency Operations Operator initiated Automatic control if Operator doesn t act Sequential activation of storage based on storage levels or time-to-fill tunnel storage
23 Emergency Operations Tunnel Storage INFLUENT/STORAGE TUNNEL WET WELL Storage Chamber Emergency Elevation Influent Line Normal Elevation
24 Emergency Operations Storage/Diversion North Creek Storage Logboom Storage Force Mains Interceptor Storage
25 Emergency Operations Time Remaining to Fill Tunnel (hours) Setpoints Matrix 2 - Storage and Diversion Control Strategy Sequence Based on Predicted Time to Fill Tunnel Brightwater System Storage Pump Station Transition Shortcut Diversion Long Way Diversion CS CS CS CS CS CS CS CS CS Start Storing in North Creek Storage Facility Start Emergency Storage in Sammamish Interceptor North Creek Pump Station to Hot Standby York Pump Station to Hot Standby Divert Swamp Creek Trunk to Logboom Storage Divert North Lake Sammamish Interceptor to Eastside Interceptor via Pump Station Divert to Eastside Interceptor via North Creek and York Pump Stations Divert to Eastside Interceptor via North Creek and York Pump Stations Divert to Kenmore Interceptor Section 5 1 forcemain 2 forcemains Annunciate operator message Dispatch North Creek Pump Station spool piece installation crew
26 System Architecture PLC based for compatibility with existing elements Fiber optic communications, with some radio/telephone where FO not available Local HMI provided at all sites All controls duplicated at Brightwater Supervisory Control Center Virtually all control strategies automated but operator intervention allowed
27 Construction Status
28 Looking Forward Startup planning: Initiated in 2007 Component and operational testing by each contract All Conveyance control system programming by IPS contract Startup and Commissioning IPS/Plant System testing with fresh water in 2010 Wastewater introduced in mid day commissioning period Full System in operation: After tunnel and Odor Control Facility completion in early 2012
29 Looking Forward Operations training requirements System configuration and normal operation Emerson controls Periodic (annual?) training for emergency operations Predicted more than 20-year recurrence Impact of failure is great Refresher needed to avoid control paralysis Desktop scenarios to maintain capabilities
30 What Has Been Our Experience? No handbook for such planning Extensive planning by many players Operations input and cooperation was essential Need to review and account for as many flow scenarios as possible Guiding principles helped greatly in communicating design/operating intent to users and agency Written plan was key to success Has needed close attention through construction
31 Results to Date Hollywood Pump Station mods functioning as designed Completed facilities at North Creek Pump Station operating as planned for Phase 1 Close cooperation between Conveyance team and System Integrator (IPS contract) through startup planning and execution Initial startup has gone according to plan Experience gained will facilitate next phases of startup
32 Acknowledgements Ron Kohler, King County Bob Peterson, King County Spencer Gladwell, MWH (UK) Bob Bower, HDR Randy Geist, HDR
33 Contact Information Bill Cranston MWH Americas, Inc th Ave. NE, Suite 200 Bellevue, WA Phone:
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