utilising the latest innovations in hydraulic grit capture ... · decreasing economic investment...
TRANSCRIPT
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Utilising the Latest Innovations in
Hydraulic Grit Capture Technology
for Increased Efficiencies and
Decreasing Economic Investment
Aqua Enviro Events Suite
Wakefield
30th April 2015
Presented by:
Chuck Miller, S&L Inc. Exec. VP of International Div.
Andy Hornabrook, S&L Ltd. UK Sales Engineer
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Smith & Loveless
• Founded 1946 in Kansas, USA
• Pioneered Factory-Built Sewage Pump
Stations and Treatment Plants
• Developed The PISTA® --World’s Leading
Vortex Grit Removal System in 1973
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Smith & Loveless Inc.
• 35,000+ Separate Global Installations
(All 7 Continents)
• Sales and Manufacturing Facilities in
Kansas City, Los Angeles, Auckland,
London & Hyderabad, India
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• Fundamentals
• True Vortex Operation
• Handling Wide Variations in Flow
• Grit Removal Efficiencies & Testing
• Types of Grit Removal Systems
• Grit Pumping
• Grit Dewatering Classifiers & Washers
• Off-Site Built Inletworks
Outline
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Grit Removal
What is “Grit”?
Grit is heavy mineral matter consisting of a
variety of particles including sand, gravel,
cinder, and other heavy, discrete inorganic
materials found in domestic sewage.
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Grit Removal
Effects Upon Treatment Plant
– Accumulation in Channels Results in
Slugs of Grit During High Flow Events
– Accumulation Within Basins Reduces
Process Basin Volumes and Retards
Efficiency
– Abrasion Wears Equipment Prematurely
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True Hydraulic Vortex
Grit Removal
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PISTA® Grit Removal System
• PISTA® Provides Latest Technology in Grit
Removal for Municipal and Industrial
Applications
• World Leader in Vortex Grit Removal since
1973
• 95% Grit Removal Down to 105 Micron
Particle Size
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PISTA® Grit Removal System
• 2,500+ Systems Installed Globally
• Complete Grit Handling & Washing System
• Significantly Smaller Footprint than Aerated
Grit Chambers, Detritors and Horizontal
Grit Chambers
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PISTA® Grit Removal System
• Up to 10 Times Lower Energy Costs
• Exclusive Flat Floor Grit Chamber Creates
True Hydraulic Vortex
• Superior Removal of Fine Grit with Less
Organics Versus Other Technologies
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SINGLE UNITS FROM
1,900 TO 378,500 M3/DAY
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Reprinted with the permission of Smith & Loveless, Inc. © 2007-2010.
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PISTA® 360™ with V-FORCE BAFFLE™
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Reprinted with the permission of Smith & Loveless, Inc. © 2007-2010.
Forced Hydraulic Movement
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Ideal Flow Velocities
• Range between 0.5 to 1.1 m/sec.
• Causes grit suspension in the flow,
traveling like a moving bed.
• Higher velocities (> 1.1 m/sec), the flow
becomes turbulent dispersing the grit bed.
• Lower velocities (< 0.5 m/sec.), grit will
settle & have limited movement.
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Handling Wide Variations in Flow
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PISTA® 270™ Layout
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V-FORCE FLOW FLOW
BAFFLE at 0.49 M/SEC at 0.49 M/SEC
360-DEGREE (L/S) 270-DEGREE (L/S)
1.0B 8.76 1.0 4.38
2.5B 13.14 2.5 26.29
4.0B 17.53 4.0 43.81
7.0B 30.67 7.0 78.86
12.0B 48.19 12.0 175.25
20.0B 83.24 20.0 306.69
30.0B 127.06 30.0 438.13
50.0B 219.06 50.0 788.63
70.0B 306.69 70.0 963.88
100.0B 438.13 100.0 1621.074381
3067
2191
1314
876
526
307
175
110
44
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At 3067 lps, H1* = 152 cm, Vel = 1.1 m/sec
At 1533 lps, H1 = 105 cm, Vel = 0.8 m/sec
At 800 lps, H1 = 90 cm, Vel = 0.49 m/sec
At 307 lps, H1 = 76 cm, Vel = 0.22 m/sec
H1 = inlet channel water elevation
PISTA 360 WITH Submerged Weir
Reprinted with the permission of Smith & Loveless, Inc. © 2007-2013.
H1
Based on 61 cm weir height
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At 3067 lps, H1 = 152 cm, Vel = 1.07 m/sec
At 1270 lps, H1 = 85 cm, Vel = 0.8 m/sec
At 570 lps, H1 = 49 cm, Vel = 0.6 m/sec
At 307 lps, H1 = 34 cm, Vel = 0.5 m/sec
H1 = inlet channel water elevation
PISTA 360 WITH V-FORCE BAFFLETM
Reprinted with the permission of Smith & Loveless, Inc. © 2007-2013.
H1
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Grit Removal Efficiency
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- 95% of 300 micron grit and larger
- 85% of 210 micron grit but less than 300 micron
- 65% of 150 micron grit but less than 210 micron
PISTA® 360™ with V-FORCE BAFFLE™,
PISTA® 270™ or PISTA® 360™ with Submerged Weir
- 95% of 105 micron and larger
Grit Removal Efficiency
Aerated, Velocity Channels, Sloped Floor & Detritors
- 85% to 90% of 200 micron and larger
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Grit Testing Methodologies
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Cross Channel Testing Method
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Vertical Integrated Sampler
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Actual Field Test - Comparison
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30 minute
sample time
306 minute
sample time
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True Hydraulic Vortex Grit Removal
Versus
Gravity Grit Removal Systems
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Forced Vortex
Gravity Based
Reprinted with the permission of Smith & Loveless, Inc. © 2007-2010.
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Particle Size Analysis of Sand
Mechanical Grit
Henry Bendel’s Original Sloped Floor Grit Chamber Testing
Virtually All of the Sand > 0.6 mm is Retained
105 210 300 600 MICRON Grain Diameter mm
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Original Sloped Floor Grit
Test
• Captured 93.5% of 300 micron Grit & Larger
• Captured 50% of Grit Smaller Than 300 micron
• 92.5% of Grit Tested was Larger Than 300
Micron
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Gravity is Too Slow!
• Correlates to a particle’s settling velocity,
which measures the speed or time a
particle will settle in the water.
Reprinted with the permission of Smith & Loveless, Inc. © 2007-2010.
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Gravity Grit Chamber Design
Courtesy of OVIVO
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True Hydraulic Vortex Grit Removal
Versus
Aerated Grit Chambers
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Aerated Grit Chamber
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Velocity Channel
• Difficult to maintain 0.3 m/s velocity with varying flows
• Removes 90% to 95% of 200 micron & larger
• Higher construction costs & much larger footprint
• Excessive headloss (30% to 40% of flow depth)
• Complex grit extraction parts subject to wear
• High organic capture
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Hydraulic Vortex Grit Removal
Versus
Detritors
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Detritor Grit Chamber
Photo by EIMCO
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PEAK FLOW (LPS) PISTA MODEL #
PISTA
FOOTPRINT
(M2)
DETRITOR
FOOTPRINT
(M2)
44 1.0 2.5 6.3
110 2.5 3.5 9.0
175 4.0 4.5 12.3
307 7.0 7.1 20.3
525 12.0 10.8 30.3
876 20.0 18.9 49.0
1315 30.0 23.8 72.3
2191 50.0 29.2 121.0
3067 70.0 41.9 NA
4381 100.0 75.4 NA
Footprint Comparison of PISTA® and Detritors
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Detritor
• High organic capture
• Fine grit loss due to agitation by the rake arm
• Higher construction costs & larger footprint
• Removes 90% to 95% of 200 micron & larger
• Difficulty handling wide variations in flow
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Full Scale Test Results Utilising Cross Channel Sampling
Technology Flow300
micron210
micron150
micron105
micron
AGC Design 98.76% 79.82% 70.61% 12.25%
Detritor 30.0% 98.35% 97.95% 97.05% 84.10%
Velocity Channel 39.1% 97.00% 97.30% 96.90% 97.70%
PISTA® 360B Design 99.61% 99.22% 98.77% 98.53%
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Hydraulic Vortex Grit Removal
Versus
Stacked Tray
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75 MLD PISTA® 68 MLD STACKED TRAY UNIT
Grit Pump
50 GPM (3.15 LPS) at 50 psig (3.45 Bar)
(15 min. every 4 hours)
Grit Hopper/Grit Pump
20 GPM (1.3 LPS) at 50 psig (3.45 Bar)
(continuous)
Grit Cyclone
15 GPM (1.0 LPS) at 50 psig (3.45 Bar)
(continuous)
Grit Cyclone
50 GPM (3.2 LPS) at 50 psig (3.45 Bar)
(30-120 seconds every 1-2 hrs)
Grit De-watering Conveyor
10 GPM (0.6 LPS) at 50 psig (3.45 Bar)
(continuous)
DailyTotal: 4,500 gallons/day (17 m3/day) DailyTotal:
66,000 gallons/day (250 m3/day)
Fluidising Water Requirements
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PISTA® STACKED TRAY UNIT
Grit Pump
10 HP (7.5 kW)
15 min. every 4 hours
Grit Pump
10 HP (7.5 kW)
Continuous
Grit Dewatering Conveyor
1 HP (0.7 kW)
20 min. every 4 hours
Grit Dewatering Conveyor
1/3 HP (0.2 kW)
(Continuous
PISTA® Drive
1-1/2 HP (1.1 kW)
Continuous
Daily Total:
53 hp-hr/day
(40 kW- hr/day)
Daily Total:
247.2 hp-hr/day
(184 kW- hr/day)
Energy Use
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Grit Pumping
•Airlift
•Centrifugal
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Airlift Pump
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Smith & Loveless Original 1973 Design
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Centrifugal Pump
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Centrifugal Pump
• Top Mounted or Flooded Suction
Arrangement
• Creates Higher Suction Head to Pull Grit
Out of Hopper
• Higher Lift Capability of Up To 17 m
• Allow for More Efficient Grit Dewatering and
Cleaner Grit
• Lower Clogging Potential in Piping
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Recessed Impeller
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Reprinted with the permission of Smith & Loveless, Inc. © 2007-2010.
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Vacuum Priming for PISTA
• A Simple Process Consists of the
• Following to Prime the Pump:
– Vacuum Pump
– Sonic Start Prime Sensor
– Solenoid Valve
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S&L Vacuum Primed Pump
SONIC START® STREAMLINE™
Prime Sensor Determines WhenWater Level is Above the Seal
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1. SONIC START® STREAMLINE™
Prime Sensor
2. Solenoid Valve
3. Vacuum Pump
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Reprinted with the permission of Smith & Loveless, Inc. © 2007-2010.
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Grit Dewatering
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Reprinted with the permission of Smith & Loveless, Inc. © 2007-2010.
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Inside Look of the Screw Conveyor
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Reprinted with the permission of Smith & Loveless, Inc. © 2007-2010.
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• Reduce Grit Hauling Costs
• Landfill Restrictions
• Reduce Odour & Disease Conveying Insects.
• More Stringent Regulations.
Why a Grit Washer?
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Grit Washer
Reprinted with the permission of Smith & Loveless, Inc. © 2007-2010.
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Off Site Build Headwork
Technologies
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PISTA®WorksTM
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PISTA® WORKS™
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Thank You
www.SmithandLoveless.com
www.PISTAgritchamber.com
www.GRITtheFacts.com