WATEREUSE LA CHAPTER MEETING ber 2013 INITIAL EXPANSION OF OCWD GWRS - - PowerPoint PPT Presentation

▶
watereuse la chapter meeting
SMART_READER_LITE
LIVE PREVIEW

WATEREUSE LA CHAPTER MEETING ber 2013 INITIAL EXPANSION OF OCWD GWRS - - PowerPoint PPT Presentation

Sep 19, 2023 551 likes •707 views

WATEREUSE LA CHAPTER MEETING ber 2013 INITIAL EXPANSION OF OCWD GWRS 8 Octob ANDREW LAZENBY, SUNNY WANG, AND MEHUL PATEL INITIAL EXPANSION OF ORANGE COUNTY WATER DISTRICT'S ORANGE COUNTY WATER DISTRICT S GROUNDWATER REPLENISHMENT SYSTEM 2 OCWD

slide-1
SLIDE 1

ber 2013

WATEREUSE LA CHAPTER MEETING ‐ INITIAL EXPANSION OF OCWD GWRS

8 Octob

ANDREW LAZENBY, SUNNY WANG, AND MEHUL PATEL

slide-2
SLIDE 2

INITIAL EXPANSION OF ORANGE COUNTY WATER DISTRICT'S ORANGE COUNTY WATER DISTRICT S GROUNDWATER REPLENISHMENT SYSTEM

2

slide-3
SLIDE 3

OCWD GWRS PROJECT OBJECTIVES

  • Protect groundwater
  • Protect groundwater

basins from seawater intrusion

  • Replenish local

groundwater supplies

  • Provide multi‐barrier

treatment system to t d i ki t meet drinking water requirements

3

Schematics and Photos Courtesy of OCWD

slide-4
SLIDE 4

OCWD GWRS PROCESS FLOW DIAGRAM

Sodium Hypochlorite MF Cleaning System Compressed Air MF Backwash

OCSD Plant No. 1 Secondary Secondary Effluent OCSD Plant No. 1 Filter Screens Microfiltration MF Break Tank RO Transfer Pump Station

Sulfuric Acid and RO Flush System Hydrogen Peroxide

OCSD Ellis Ave. Interplant Sewer To Barrier Reverse Osmosis Decarbonator

Sulfuric Acid and Anti-Scalant Addition RO Cleaning System Air S di

Injection Wells To Kraemer/Miller Spreading Basins ncentrate RO Feed Pump Cartridge Filters Ultraviolet Irradiation System

Sodium Bisulfite RO Flush Lime Sodium Bisulfite To Santa Ana River

To OCSD Ellis Ave. Interplant Sewer To OCSD Ocean Outfall RO Con RO Bypass (SAR only) Peak Flow and Emergency Bypass RO Flush Tank FPWB

4

  • r

OCSD Ocean Outfall

yp ( y) g y yp

slide-5
SLIDE 5

MULTI BARRIER TREATMENT SYSTEM

  • MF Pretreatment

MF Pretreatment

  • Hollow fiber PVDF membranes, 0.2 um pore size
  • Removes bacteria, protozoa, and suspended solids
  • RO Membranes
  • Removes dissolved solids, viruses, organic compounds

(including pharmaceuticals), etc. (including pharmaceuticals), etc.

  • Concentrate blended with WWTP effluent and

discharged to ocean

  • Advanced Oxidation – UV/H O
  • Advanced Oxidation – UV/H2O2
  • Low pressure, high output system
  • Destroys trace organics
  • Removes NDMA and 1,4 Dioxane
  • Post‐Treatment Stabilization

5

  • Decarbonation to raise pH
  • Lime addition to stabilize RO permeate
slide-6
SLIDE 6

EXPANSION PROVIDED AN OPPORTUNITY TO ENHANCE OPERATIONS AND RELIABILITY

  • Secondary effluent flow

equalization provided to

ENHANCE OPERATIONS AND RELIABILITY

minimize diurnal flow variations and maximize production

  • Incorporated energy

recovery devices (ERD) to new RO units to reduce energy consumption and energy consumption and prolong membrane life

  • New RO building layout to

improve accessibility to improve accessibility to basement and pipe gallery

  • Pilot tested and

implemented new lime slurry implemented new lime slurry system to enhance post‐ treatment reliability

6

slide-7
SLIDE 7

Permeate (12 psi)

INCORPORATE ENERGY RECOVERY DEVICES TO REDUCE ENERGY CONSUMPTION

Permeate (12 psi)

1.58 mgd 5 mgd 112 psi 95 psi 3.76 mgd 1.16 mgd 0 11 mgd 3.23 mgd 5.88 mgd 2.16 mgd 1 mgd 140 psi 112 psi 95 psi 0.11 mgd 124 psi 2.7 mgd 1.12 mgd 0.23 mgd 149 psi 102 psi

Feed

g 0.88 mgd 73 psi g g

Concentrate Energy recovery device w/motor

82 psi

gy y /

17.2 gfd 8.7 gfd 1.7 gfd 14.4 gfd 12.2 gfd 3.8 gfd

Fluxes

7

  • Annual energy savings of approximately $17k per RO unit
  • Payback period of ERDs is approximately 5 years
slide-8
SLIDE 8

IMPROVED OPERATION ACCESS IN NEW RO BUILDING

8

slide-9
SLIDE 9

ALTERNATIVE POST‐TREATMENT TARGET TO IMPROVE STABILITY AND RELIABILITY IN IMPROVE STABILITY AND RELIABILITY IN WATER QUALITY

  • Alternative target mimics rain water quality

for groundwater replenishment

  • Increased buffer intensity improves reliability
  • Increased calcium content better protects

cement mortar lined pipes

  • Alternative target minimizes transport of

metals within groundwater supply

9

slide-10
SLIDE 10

LIME SYSTEM IMPROVEMENTS

Existing Lime Slurry System

  • Existing system is a flow paced system

that is ramped up and down based on flow conditions (inconsistent reaction

Existing Lime Slurry System

flow conditions (inconsistent reaction times in slurry make‐up tank)

  • Dry lime transfer system is susceptible

to plugging and is controlled by screw d conveyer speed

  • Unable to keep up with peak lime

demands

  • Lime slurry make‐up is controlled by

weight, providing a greater level of

New Lime Slurry System (RDP Lime Slaker System)

accuracy over the existing flow paced system

  • Temperature controlled system to

maintain optimum reaction conditions maintain optimum reaction conditions

  • Dry lime transfer system is not

susceptible to plugging

10

slide-11
SLIDE 11

PHOTOS OF RDP SLAKING SYSTEM PILOT TEST

Lime Slurry Aging Tank y g g Lime Slaker Tank

11

Slurry Transfer and Feed Pump Lime Slurry Feed Assembly

slide-12
SLIDE 12

CONSTRUCTION PHOTOS

12

slide-13
SLIDE 13

CONSTRUCTION PHOTOS

13

slide-14
SLIDE 14

www.bv.com