LE TOUR DE HYDRAULICS ANDLE TOUR DE HYDRAULICS AND CONTROL AT OCSD’S PLANT NO. 1

Rich ten Bosch, PE

April 2007

Overview

Orange County Sanitation District (OCSD)

Secondary Activated Sludge Facility 2 at Plant No. 1 Project (P1-102)

Hydraulic Analysis

Flow Control StrategyFlow Control Strategy

April 2007

Orange County Sanitation District Plant Nos 1 & 2 Vicinity MapPlant Nos. 1 & 2 Vicinity Map

Plant No. 1 –Plant No. 1 Reclamation PlantFountain Valley

Plant No. 2 –Treatment PlantHuntington Beach

April 2007

Huntington Beach

Orange County Sanitation District Key Statistics

Service area includes:

Key Statistics

471 square miles

21 cities

3 special districts

2.5 million residents

625 miles of collection system pipeline

245 MGD average daily flow received

120-inch diameter 5 mile long ocean outfall

301h Waiver

April 2007

Orange County Sanitation District Flow and CapacityFlow and Capacity

Plant No. 1 2006 Capacity

Primary 88 MGD 204 MGD

Secondary 71 MGD 105 MGD

Plant No. 2

Primary 155 MGD 168 MGD

Secondary 90 MGD 90 MGD

66% of the flow receives secondary treatment

April 2007

Secondary Activated Sludge Treatment Facility 2 at Plant No 1 (Project P1 102)at Plant No. 1 (Project P1-102)

Objectivesj

Increase the secondary treatment capacity at Plant No. 1

Current: 105 MGD (30 MGD TF + 75 MGD AS1)

Future: 165 MGD (60 MGD AS2)Future: 165 MGD (60 MGD AS2)

Provide flow to Groundwater Replenishment System (GWRS)(GWRS)

Quantity: Phase 1 – 128 MGD; Phase 3 – 185 MGD

April 2007

Quality: 5 NTU Monthly / 10 NTU Instantaneous

Secondary Activated Sludge Facility 2 atPlant No 1 Site PlanPlant No. 1 – Site Plan

Blower Building

Aeration Basins Secondary Clarifiers

Blower Building

SC GalleryTunnels

April 2007

Secondary Activated Sludge Treatment Facility 2 at Plant No 1 (Project P1 102)at Plant No. 1 (Project P1-102)

Trickling Filter Facility (P1-76)

30 MGDN

Secondary ActivatedSecondary Activated Sludge Facility 1

(P1-82) 75 MGDNew Secondary

P1-102

yActivated Sludge

Facility 2(Project P1-102)

60 MGD

April 2007

60 MGD

Hydraulic AnalysisOverviewOverview

Issues and ConstraintsIssues and Constraints

Hydraulic Analysis Goals

Hydraulic Model

Model DiscoveriesModel Discoveries

Hydraulic Analysis Results

April 2007

Hydraulic Analysis– Issues and ConstraintsPlant Wide HydraulicsPlant Wide Hydraulics

Existing Secondary Activated

Existing Trickling Filters (P1-76)

Existing Secondary Activated Sludge Facility 1 (P1-82)

April 2007

New Secondary Activated Sludge Facility 2 (P1-102)

Hydraulic Analysis – Issues and Constraints 15 Flow Scenarios15 Flow Scenarios

Scenarios divided intoScenarios divided into three main categories

-Average Dry WeatherWeather

-Maximum Hydraulic Capacity

-Storm

Divided into subcategories based upon treated effluent distribution options

-Groundwater Replenishment System

O O tf ll

April 2007

-Ocean Outfall

Hydraulic Analysis – Issues and Constraints Secondary Influent Feed

Primary Effluent

Secondary Influent Feed

Primary Effluent Pump Station 1

Trickling Filter Pump FM

dPrimary Effluent Distribution Box

Pump Station

Primary Effluent Pump Station 2 (Future)

FM

FM

April 2007

Throttling BFVFM

Hydraulic Analysis – Issues and ConstraintsSecondary Effluent DischargeSecondary Effluent Discharge

To Plant No. 2 / Ocean Outfall

Plant Water Pump Station

OCOCWD Pump

Station

Groundwater Recharge System

April 2007

Hydraulic Analysis - Goalsy y

Maximize gravity flow capacityMaximize gravity flow capacity

Establish weir elevations

Avoid flooding of secondary weirs

Ensure flow quantity to GWRS PWPS etcEnsure flow quantity to GWRS, PWPS, etc

Identify required control devices

Minimize active controls

Id tif f t i tIdentify future improvements

Hydraulic Analysis – Hydraulic ModelNodesNodes

April 2007

Hydraulic Analysis – Hydraulic ModelDetailed Hydraulic CalculationsDetailed Hydraulic Calculations

April 2007

Hydraulic Analysis – Hydraulic ModelThe Ultimate Balancing ActThe Ultimate Balancing Act

April 2007

Hydraulic Analysis - DiscoveriesControl Structures

To Plant No. 2 / Ocean Outfall

Control Structures

Plant Water Pump Station

OCWD

SEJB NO.1

OCWD Pump

Station

SEJB NO.2 `

Groundwater Recharge System

PEDB

SEJB NO.6

April 2007

Hydraulic Analysis – ResultsSummarySummary

Validated Plant No. 1 hydraulicsy

Determined maximum gravity capacity of 120 MGD for the P1-102 facilityMGD for the P1-102 facility

Established P1-102 weir elevations

Identified control structure weir elevations

E t bli h l i t & BFV itiEstablish sluice gate & BFV positions

Minimized active controls

April 2007

Identified future improvements

Hydraulic Analysis - ResultsFuture ImprovementsFuture Improvements

Upsize Secondary

Install

p yEffluent Pipeline

Install Adjustable

Weirs at Critical Flow DiversionFlow Diversion

Structures

Lower the GWRS Screenings Weir

Install Parallel

April 2007

Install Parallel Flowmeter

Flow Control StrategyOperational Philosophy

Base Loaded Scenarios

Operational Philosophy

Base Loaded Scenarios

P-82 Base Load Scenario

P1-102 Base Load Scenario

P1 76 Base Load ScenarioP1-76 Base Load Scenario

Free Floating Scenario

Recycle Flows

April 2007

Flow Control StrategyGoalsGoals

Maintain Quantity and Quality of Flow to GWRSMaintain Quantity and Quality of Flow to GWRS

Maintain Flow to PWPS and OCWD PS

Optimize Treatment

Maintain Simple Control StrategyMaintain Simple Control Strategy

April 2007

Flow Control StrategySetpointsSetpoints

P1-102 Facilityy

40 MGD Side

Minimum Flowrate 1 MGD

Average Design Flowrate

Maximum Hydraulic Flowrate

40 MGD

80 MGD

20 MGD Side

Minimum Flowrate

Average Design Flowrate

1 MGD

20 MGDAverage Design Flowrate

Maximum Hydraulic Flowrate

20 MGD

40 MGD

April 2007

Flow Control StrategyP1 82 Base Loaded Low FlowP1-82 Base Loaded – Low Flow

P1-82D = 75 mgdH = 110 mgdA = < 75 mgd PWPS

P1-76D = 30 mgd

H = 75 mgd

A 0 dP1-102

OCWD

A = 0 mgd (40 mgd)D = 40 mgdH = 80 mgdA = 0 mgd

GWRS

P1-102 (20 mgd)

D = 20 mgd

Recycle

April 2007

D = 20 mgdH = 40 mgdA = 0 mgd

Flow Control StrategyP1 82 Base Loaded 75 mgdP1-82 Base Loaded – 75 mgd

P1-82D = 75 mgdH = 110 mgdA = 75 mgd PWPS

P1-76D = 30 mgd

H = 75 mgd

A 0 dP1-102

(40 d)

OCWD

A = 0 mgd (40 mgd)D = 40 mgdH = 80 mgdA = < 40 mgd

GWRS

P1-102(20 mgd)

D = 20 mgd

Recycle

April 2007

D 20 mgdH = 40 mgdA = 0 mgd

Flow Control StrategyP1 82 Base Loaded 115 mgdP1-82 Base Loaded – 115 mgd

P1-82D = 75 mgdH = 110 mgdA = 75 mgd PWPS

P1-76D = 30 mgd

H = 75 mgd

A < 30 dP1-102

(40 d)

OCWD

A = < 30mgd (40 mgd)D = 40 mgdH = 80 mgdA = 40 mgd

GWRS

P1-102(20 mgd)

D = 20 mgd

Recycle

April 2007

D 20 mgdH = 40 mgdA = < 20 mgd

Flow Control StrategyP1 82 Base Loaded 165 mgdP1-82 Base Loaded – 165 mgd

P1-82D = 75 mgdH = 110 mgdA = 75 mgd PWPS

P1-76D = 30 mgd

H = 75 mgd

A 30 dP1-102

(40 d)

OCWD

A = 30 mgd (40 mgd)D = 40 mgdH = 80 mgdA = 40 mgd

GWRS

P1-102(20 mgd)

D = 20 mgd

Recycle

April 2007

D 20 mgdH = 40 mgdA = 20 mgd

Flow Control StrategyP1 82 Base Loaded 210 mgdP1-82 Base Loaded – 210 mgd

P1-82D = 75 mgdH = 110 mgdA = 75 mgd PWPS

P1-76D = 30 mgd

H = 75 mgd

A 75 dP1-102

(40 d)

OCWD

A = 75 mgd (40 mgd)D = 40 mgdH = 80 mgdA = 40 mgd

GWRS

P1-102(20 mgd)

D = 20 mgd

Recycle

April 2007

D 20 mgdH = 40 mgdA = 20 mgd

Flow Control StrategyP1 82 Base Loaded 230 mgdP1-82 Base Loaded – 230 mgd

P1-82D = 75 mgdH = 110 mgdA = 75 mgd PWPS

P1-76D = 30 mgd

H = 75 mgd

A 75 dP1-102

(40 d)

OCWD

A = 75 mgd (40 mgd)D = 40 mgdH = 80 mgdA = 40 mgd

GWRS

P1-102(20 mgd)

D = 20 mgd

Recycle

April 2007

D 20 mgdH = 40 mgdA = 40 mgd

Flow Control StrategyP1 82 Base Loaded 270 mgdP1-82 Base Loaded – 270 mgd

P1-82D = 75 mgdH = 110 mgdA = 75 mgd PWPS

P1-76D = 30 mgd

H = 75 mgd

A 75 dP1-102

(40 d)

OCWD

A = 75 mgd (40 mgd)D = 40 mgdH = 80 mgdA = 80 mgd

GWRS

P1-102(20 mgd)

D = 20 mgd

Recycle

April 2007

D 20 mgdH = 40 mgdA = 40 mgd

Flow Control StrategyP1 82 Base Loaded 305 mgdP1-82 Base Loaded – 305 mgd

P1-82D = 75 mgdH = 110 mgdA = 110 mgd PWPS

P1-76D = 30 mgd

H = 75 mgd

A 75 dP1-102

(40 d)

OCWD

A = 75 mgd (40 mgd)D = 40 mgdH = 80 mgdA = 80 mgd

GWRS

P1-102(20 mgd)

D = 20 mgd

Recycle

April 2007

D 20 mgdH = 40 mgdA = 40 mgd

Flow Control StrategyP1 82 Base Loaded 444 mgdP1-82 Base Loaded – 444 mgd

P1-82Blending

D = 75 mgdH = 110 mgdA = 110 mgd PWPS

P1-76D = 30 mgd

H = 75 mgd

A 75 dP1-102

(40 d)

OCWDBlending

A = 75 mgd (40 mgd)D = 40 mgdH = 80 mgdA = 80 mgd

GWRS

P1-102(20 mgd)

D = 20 mgd

Recycle

April 2007

D 20 mgdH = 40 mgdA = 40 mgd

Flow Control StrategyFree Floating ScenarioFree Floating Scenario

P1-82D = 75 mgdH = 110 mgd

PWPS

P1-76D = 30 mgd

H = 75 mgdP1-102

OCWD

(40 mgd)D = 40 mgdH = 80 mgd

GWRS

P1-102 (20 mgd)

D = 20 mgd

April 2007

D = 20 mgdH = 40 mgd

QUESTIONSQUESTIONS

April 2007