An Innovative Energy Saving Primary Filtration Using Cloth ...An Innovative Energy Saving Primary...

Providing AdaptiveProviding Adaptive Water ManagementWater Management SolutionsSolutions

Jia (Jack) Ma, PhD, PE, D.WREProduct Manager – Filtration

An Innovative Energy Saving Primary Filtration Using Cloth Media Technology

Agenda

• Introduction to Aqua-Aerobic Systems

• OptiFiber® Pile Cloth Media Filtration

• Primary Filtration at Rock River Water Reclamation

District, IL

• Summary

Aqua-Aerobic Systems, Inc.Loves Park, IL

• Founded in 1969, Privately Held Company

• 130 Employees (Office and Manufacturing)

• Applied Engineering Focus

• > 10% of Profits Back to R&D

• Manufacture Key Components

• > 24 Patented Products and Processes

Technology Timeline

Aqua‐Jet® Aerator

1975 1984 1986 1991 1993 1999 2003 2004

AquaDDM® Mixer

AquaABF® Filter

Aqua MixAir®System

AquaSBR® System

Aqua MSBR® System

Cloth Media Filtration

AquaMB Process®

System

AquaDiamond® Filter

Aqua‐Aerobic® MBR System

Technology Timeline

AquaPASS® System

IntelliPro® Process

Management System

ContinuedInnovation

2008 2009 2010 2011 2012

AquaBioMax™

OptiFiber PES‐14

MicroFiber OxyMix® Pure Oxygen Mixer

UltraFiltration™

Flow Characterization

Intellipro®Aqua‐Jet® TTHM Approval

Research Technology Center

Aqua MegaDisk™

Filtration ExperienceOver 3,000 Units Installed

OptiFiber® Pile Cloth Media Filtration

OptiFiber Pile Cloth Media

• Pile Construction

• Polyester Support Backing

Maximize

• Removal of TSS

• Hydraulic throughput

Minimize

• Chemical

• Backwash

Filtration Goals

Filtration Particle Removal Mechanisms

Straining

Sedimentation

Impaction

Interception

Adhesion

Flocculation

Surface Mechanism

Depth Filtration

So, what does all this mean?

Rapid Sand Filter

L/D = 500-1000

PES-14 Microfiber

L/D = 425-715

L/D Ratio

L=300-600 mm

D=d10=0.6 mm D≈0.007 mm

L=3-5 mmWhen wet

Filtration Particle Removal Mechanisms

Surface Mechanism Depth Filtration

AquaDisk® Cloth Media Filter

How AquaDisk® Cloth Media Filter Works

Primary FiltrationRock River Water Reclamation District

April 8 – July 13 2014

Testing Objectives

Hydraulic and solids loading capabilities

Relative cloth performance (PA2-13 vs. Microfiber vs. Clarifier)

Energy savings

BW/SW volume and frequency (% of applied flow)

Research & Technology Center

– Located at Rock River Water Reclamation District

– 80ft by 60 ft x 14 ft (tall)– Inputs: primary influent and

effluent, secondary effluent, RAS

Testing Equipment

Screen (¼ inch

openings) Filtration

Grit removal

Raw Sewage

Primary

Testing Conditions

24/7 operation

Side-by-side testing with primary clarifier

Flux rates 3.25 – 4.0 gpm/sf-day, mostly 3.25 gpm/sf-day

Filter influent TSS averaged 236 mg/L (104 – 526 mg/L)

Solids loading rates approximately 9 – 10 lb/sf-day

No chemical addition

OptiFiber PA2-13®

(April 8 – May 9, 2014)

OptiFiber® Pile Cloth Media Tested

OptiFiber PES-14®

(May 9 – July 13, 2014)

Results:

1Represents the average of daily removals Σ(inf-eff)/∑inf, not removal of overall averages (Σinf –Σeff)/Σinf2Results represent one grab sample per medium

Results – TSS & BOD Removal:

Results – TSS Removal:

Results – TSS Trending

Results – BOD Removal:

Results – BOD Trending

Results – UVT Improvement:

Results – UVT Trending

Summary

Performance

• Consistently high effluent for the variable influent conditions

Filters in lieu of Primary Clarification

• Better removal of TSS and BOD5

• More VSS (~25-38%) to the anaerobic digester

• More energy recovery (gas production)

• Less energy (~30-45%) use in the downstream aeration process

Primary Effluent Disinfection Systems

• Reduced Energy/Improved performance

Implications:

Backwash

• Ranged from 12 to 13% of the applied flow

• Optimization was not an objective of this study

• Improvement can be achieved by BW set-point adjustment and filter basin re-design

Fats, Oils and Grease (FOG)

• Did not affect the operation or removal performance

Implications:

Settling Basin

Aqua MegaDisk Filter

Implications:

• Replacement of primary clarifier for better removals and smallerfootprint

• Carbon reduction to reduce energy in the activated sludge process

• Carbon diversion to improve gas production in anaerobic digestion

• Treatment of combined and sanitary sewer overflows (CSO & SSO) for TSS and BOD reduction

• Stormwater treatment

• Other high solids treatment process

Potential Applications:

An Innovative Energy Saving Primary Filtration Using Cloth ...An Innovative Energy Saving Primary...

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