Expanding Capacity and Treatment at an 80 MGD Surface Water Treatment - PowerPoint PPT Presentation

Dublin Road Water Plant Treatment Capacity Increase Project Expanding Capacity and Treatment at an 80 MGD Surface Water Treatment Plant Mark Eppich, P.E. Enoch Nicholson, P.E. City of Columbus S. Dean Ramsey, P.E. Division of Water CH2M HILL

Presentation Topics  System Overview  Project Background  Process Selection and Pilot Testing  Project Phasing and Construction Contracts  Current Project Status

SYSTEM OVERVIEW

City of Columbus, Ohio Water System

PROJECT BACKGROUND

Existing Treatment Plant  Conventional Lime Softening Plant  65 MGD Capacity Turbidity Softening Rapid Mix Flocculator Rapid Mix Flocculator Re-carbonation Filters Clearwell Settling Settling POTASSIUM PERMANGANATE SODIUM HYPOCHLORITE SODIUM HYDROXIDE ZN ORTHO-PHOSPHATE SODA ASH FLUORIDE Dual Media Recarbonation Softening Filters R3 ALUM Basin Basins Turbidity LIME CO2 PAC 4 2 & 3 Basins 1 & 2 West East Residual Residual R2 R1 Residual Residual R7 R3 Scioto River Residual R2

Plant Treatment Goals  Total Hardness: 120 mg/L to 125 mg/L as CaCO3  Alkalinity: >35 mg/L as CaCO3  Total Organic Carbon (TOC): <2.0 mg/L  Stage 2 DBP Compliance: – Target 80% of Location Running Annual Average (LRAA) and Operational Evaluation Level  Nitrate: < 10 mg/L as N (MCL)  Atrazine: <2.5 ppb (MCL= 3.0 ppb)  Comply with all primary drinking water regulations  Taste and Odor 7

PROCESS SELECTION AND PILOT TESTING

“Blue Ribbon” Panel Process Evaluation Water Quality Finances Operations

Treatment Processes Selected for Pilot  Organics Removal  Ozone with Biological Active Carbon (BAC) Filtration  GAC Post Filter Contactors  GAC in Existing Filters  Seasonal Nitrate Removal  Nitrate Selective Strong Base Anion Exchange

Pilot Testing 11

DRWP Ozone Pilot System 12

DRWP Filter Pilot System 13

DRWP Pilot Filter System 14

DRWP Pilot Ozone and GAC Contactor Systems 15

DRWP Pilot TOC Reduction 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Recarbonated Water Ozonated Water BAC Filter Antracite Filter (Pilot Influent) (With Ozone) (No Ozone) 16

DRWP Pilot System 3 Day TTHMs 80 70 60 3 ‐ day TTHM Formation (ug/L) Filter 6 Average 3 ‐ day TTHM = 48 ug/L 50 40 Filter 2 Average 3 ‐ day TTHM = 32 ug/L ** 30 20 10 0 6/22/2011* 9/9/2011 12/8/2011 3/8/2012 Pilot DBP Sample Date Filter 6 Anth/Sand 3 ‐ day TTHM (ug/L) Filter 2 BAC/Sand 3 ‐ day TTHM (ug/L) Notes: *First DBP samples was collected late June 2011, no early June sample was available. Only Filters 4 and 6 were operational in June 2011. **No filter 2 DBP data available for June 2011, June 2011 Sample result predicted based on other sample results in order to calculated average. 17

DRWP Pilot Filter Performance 25000 0.300 0.250 20000 0.200 15000 Turbidity (NTU) UFRV (gal/sf) 0.150 10000 0.100 5000 0.050 0 0.000 Filter 1 Filter 2 Filter 3 Filter 4 Filter 6 Ozonated Ozonated Ozonated No Ozone No Ozone GAC/Sand BAC/Sand Anthracite/Sand GAC/Sand Anthracite/Sand Average UFRV Average Turb IX 18

DRWP Pilot Atrazine Removal Effluent Influent Percent Sample Atrazine(ug/L) Removal Atrazine (ug/L) Low Ozone 22 15 32% without Peroxide Low Ozone with 22 12 45% Peroxide 21 7.7 63% High Ozone without Peroxide 22 6.9 68% High Ozone with 22 0.4 98% Peroxide 19

Anion Exchange Pilot System Schematic

Anion Exchange Pilot System

Anion Exchange Pilot Testing Data DRWP IX Pilot Effluent Nitrate DRWP IX Pilot Effluent Alkalinity 10 73 Alkalinity Samples in 10 Runs 80 139 Nitrate Samples in 13 Runs 9 70 Alkalinity Concentration (mg/L as CaCO3) 8 Nitrate Concentration (mg/L as N) 60 7 50 6 5 40 4 30 3 20 2 10 1 0 0 Minimum Average Maximum Minimum Average Maximum DRWP IX Pilot Effluent Sulfate DRWP IX Pilot Effluent Chloride 69 Sulfate Samples in 10 Runs 350 200 69 Chloride Samples in 10 Runs 180 300 160 Chloride Concentration (mg/L) Sulfate Concentration (mg/L) 250 140 120 200 100 150 80 60 100 40 50 20 0 0 Minimum Average Maximum Minimum Average Maximum

Evaluation of IX Loading Rate Impacts Bed Volumes to start of Average Effluent Nitrate Nitrate Breakthrough 10 300 263.7 262.6 9 250 8 Nitrate as N (mg/L) 7 200 Bed Volumes 6 150 5 4 100 3 2.29 2.22 2 50 1 0 0 10.7 gpm/sq ft (2 min EBCT) 4.6 gpm/sq ft (5 min EBCT) Data Includes 7 runs with 4.6 gpm/sq ft and 6 runs with 10.7 gpm/sq ft. These runs incorporated 93 and 46 samples, respectively.

CONSTRUCTION CONTRACTS PROJECT PHASING AND

DRWP Proposed Process Flow Diagram Clearwells Scioto River Low Service Flocculator Flocculator Softening Re-carbonation Ozonation Filtration Ion Exchange Intake Pumps Turbidity Settling High Service Rapid Mix Rapid Mix Settling Pumps POTASSIUM PERMANGANATE OZONE QUENCH SODIUM HYPOCHLORITE SODIUM HYDROXIDE ZN ORTHO-PHOSPHATE Turbidity Basins 1 & 2 GAC FILTER AID H2O2 SODA ASH Filters Softening FLUORIDE R4 Rehab ALUM Basins CO2 LIME Existing PAC 3 & 4 Residual R1 West East New O 3 Recarbonation New Ozone Residual R2 Residual Residual R3 R7 Scioto Residual R1 River Residual R2 Residual R5 Refit Basin 4 for Softening Residual R6 New Ion Exchange Backwash Handling Facility R1 R3 Residual R4 Quarry R2 R5 New Facilities Sludge R6 Pump NORMAL CHEMICAL ADDITION POINT Station New Facilities 5/15/2013

DRWP Contract # 1 CONTRACT # 1  Contract # 1  Site Improvements  New Sludge PS  New Electrical Substation

DRWP Contract # 2 CONTRACT # 2  Contract #2  SCADA Backbone  Filter Rebuild

DRWP Contract # 3 CONTRACT # 3  Contract #3  Basin #4 Modifications  Recarbonation  Ozonation

DRWP Contract # 4 CONTRACT # 4 CONTRACT # 4  Contract #4  Ion Exchange  Backwash Equalization  Chemical System Upgrades  Electrical System Upgrades  Control System Upgrades

DRWP Contract # 5 CONTRACT # 5  Contract #5  McKinley Quarry Sludge Pipeline

CURRENT PROJECT STATUS

Contract 1 – Site Improvements

Contract 1 – Sludge PS

Contract 1- Electrical Substation

Contract 2 – Filter Retrofit

Contract 3 – Ozone/Recarbonation Basin

Dublin Road Water Plant Treatment Capacity Increase Project Questions? Enoch Nicholson, P.E. enoch.Nicholson@ch2m.com