Disinfection By-Products

Reduction and SCADA Evaluation

and

WTP Sludge Removal System and

Dewatering Facility

Presentation to the SGWASA Board

August 8, 2017 S

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Introduction to Hazen and Sawyer

Hazen – Drinking Water Expertise

Disinfection By-Products

Reduction and SCADA

Evaluation

Our Project Team Disinfection By-Products Reduction and SCADA Evaluation

DBP Expertise

Guidance on

Compliance with the

Stage 2 D/DBP

Regulation

Hazen

developed tools

for the Water

Research

Foundation to

help assess

Risk and

survey DBP

Compliance

Options

The Decision Support Tool

DBPs Experience

Hazen’s Process Optimization and Chemical

Feed Experience

Gary Iversen, PE

• 44 years experience

• Former Operator and WTP Superintendent

• Expert in water chemistry, process optimization,

and operator training

Project Approach

Bench-Scale Testing

• Develop bench-scale testing protocol that simulates WTP

performance “plant match”

• Evaluate alternate coagulant types, doses, and pH

• Evaluate need for, type, and required dosage of coagulant

aid polymers, pre-oxidants, and PAC

• Goal is to assess optimal strategies for DBP precursor

removal

• Holistic approach – need to ensure that any strategy does

not compromise other treatment goals

Mobile Laboratory

Hazen’s mobile process laboratory will be deployed to SGWASA WTP beginning Aug. 21

Gary Iversen will lead the Process Optimization efforts and will mobilize Hazen’s Mobile Laboratory

Project Approach

Chemical Feed Evaluation

• Site visit to assess existing facilities.

• Determine required storage and feed

equipment capacities.

• Confirm compatibility of proposed

changes.

Operations Support and Training

• On-site support during planned

conversion to ferric sulfate

• On-site support during any future

process changes

• Operator Training sessions

Online THM Analyzer

Project Approach

SCADA and Automation Evaluation

• Determine automation and SCADA

system needs.

• Review SCADA system architecture at

WWTP

• Coordinate with any recommended

process changes

Regulatory Agency Coordination

• Communicate and coordinate with

PWS regarding project progress,

findings, and recommendations.

Example HMI Workstation

Schedule

Aug 8 Notice to proceed

Aug 21 Begin bench-scale testing

Oct 10 Present bench-scale testing preliminary results

Nov 28 Submit draft report

Dec 12 Present draft DBP and SCADA evaluation

recommendations

Engineering Fee

Contracts setup on time and materials

reimbursement not to exceed basis

$97,300 • DBP Reduction and

• SCADA Evaluation

Questions and Discussion

WTP Sludge Removal

System and

Dewatering Facility

Our Project Team WTP Sludge Removal System and Dewatering Facility

Residuals Experience

Comprehensive Project Approach

Project Approach

Residuals Collection

System Assessment

• Evaluate existing equipment and

coordinate with manufacturers

• Recommend improvements to

enhance reliability

• Concept-level capital costs

Residuals Production

Estimates

• Critical to coordinate with DBP

project

A switch to an iron-based

coagulant and additional PAC

and potassium permanganate

results in greater solids

production.

Project Approach

Dewatering Alternatives

• New Dewatering Facility

• Thickening + Dewatering

• Relocate existing rotary

drum thickener +

dewatering

• Residuals lagoon

2-M Belt Filter Press

Schedule

Aug 8 Notice to proceed

Nov 1 Preliminary DBP strategy informs possible range

of residuals production

Jan 15 Submit draft report

Engineering Fee

Contracts setup on time and materials

reimbursement not to exceed basis

$91,900 • Sludge Collection and

• Dewatering Facility

Questions and Discussion