grease interceptors - Plumbing & Drainage Institute

Report
CAPTURING the GREASE
MODEL CODE EDITION
Copyright
PDI 2012
Hydro Mechanical vs Gravity
•
•
•
•
Grease Interceptors UPC, IPC
How they work
Sizing
Installation
• Grease
• What it is
• Were does it come from
• What problems it cause
Copyright
PDI 2012
Copyright
PDI 2012
PDI
Plumbing and Drainage Institute
The Plumbing and Drainage Institute
(PDI) was formed in 1949. The
organization developed the original
performance requirements and
certification program for Grease
interceptors (Hydro mechanical Grease
interceptors) and Water hammer
Arrestors (Shock Arrestors)
Copyright
PDI 2012
PDI
Plumbing and Drainage Institute
•
•
•
•
Our objective
Advancement of Engineered Plumbing
Products
Research
Publish Standards
Education
Copyright
PDI 2012
PDI
Plumbing and Drainage Institute
• We also participate in the development
of the model plumbing codes
• UPC, IPC, NSPC
Copyright
PDI 2012
PDI
Plumbing and Drainage Institute
•
•
•
•
•
•
•
•
•
•
•
Ashland Poly Traps
Bio-Microbics, Inc.
Canplas Industries, Ltd.
Green Turtle Americas, Ltd.
Jay R. Smith Mfg.
Josam
Highland Tank/Lowe
Engineering
L&J Restaurant Inc.
Rockford Separators
Thermaco
Wade Specification Drainage
Products/Wade Hydromax®
•
•
•
•
•
•
•
•
•
•
Watts Water Technologies
Zurn Industries
Mifab Inc.
B K Resources Inc.
Klinger’s Trading, Inc.
L&J Restaurant Manufacturing
Import, Inc.
Prima Supply LLC/Atlantic
Metalworks
Town & Country Plastics Inc.
Triton Metals, Inc.
Wentworth Company
Copyright
PDI 2012
PDI
Plumbing and Drainage Institute
Web Site
www.PDIonLine.ORG
Copyright
PDI 2012
.
Copyright
PDI 2012
PDI
Plumbing and Drainage Institute
Publications
• PDI G101 Testing and Rating
• PDI G102 FOG Sensing and Alarm
• Guide to GREASE INTERCEPTORS:
Eliminating the Mystery
Copyright
PDI 2012
.
Copyright
PDI 2012
Copyright
PDI 2012
Grease Interceptor is a
generic term representing
a family of devices
Copyright
PDI 2012
Grease Interceptor
Definition
A plumbing appurtenance or
appliance that is installed in a
sanitary drainage system to
intercept non petroleum fats, oil,
and greases (FOG) from a
wastewater discharge.
Copyright
PDI 2012
• Gravity Interceptors
• Hydro Mechanical Interceptor
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
GRD
(AGRU)
Copyright
PDI 2012
Alarm/ Sensing
Copyright
Automatic Sensor
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
• Example 25 GPM Interceptor
• Two sinks each at 25 Gallons at 160 F
Copyright
PDI 2012
• Example 25 GPM Interceptor
• Two sinks each at 25 Gallons at 160 F
Copyright
PDI 2012
• Lard Ratio One Pound/ Five Gallons
• Five Pounds of Lard each Run at 160F
Copyright
PDI 2012
• Min. of 12 Runs per Test
• Total Lard min.60 Pounds per Test
Copyright
PDI 2012
• Min. Retained Lard 56.25 Pounds
• Grease removal efficiency 90%-95%
Copyright
PDI 2012
• Min. Retained Lard 56.25 Pounds
• Grease removal efficiency 90%-95%
Copyright
PDI 2012
• Lard is Skimmed and separated
Copyright
PDI 2012
• Lard is Skimmed and separated
Copyright
PDI 2012
• Efficiency = Grease Added - Grease Skimmed
Grease added
Copyright
PDI 2012
Testing and
Certification
Copyright
PDI 2012
Testing and Certification
Performance
Copyright
PDI 2012
Testing and Certification
Performance
Copyright
PDI 2012
Orange County Study
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
Automatic Sensor
PDI 2012
Grease Interceptor
Grease Removal Device (GRD)
Any hydro mechanical grease
interceptor that automatically,
mechanically removes non-petroleum
fats, oils and grease (FOG) from the
interceptor, the control of which are
either automatic or manually initiated.
Copyright
ASME A112.14.4
PDI 2012
•
•
•
•
•
Hydro mechanical grease interceptor
External grease collection
Timer actuated
Sensor operated
Skim off grease
Disc
Belt
Hydraulic
Pump
Copyright
PDI 2012
Copyright
Skimmer / Timer
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
•
•
•
•
•
Hydro mechanical grease interceptor
Test PDI G101 Grease separating
ASME A12.14.4 Grease removal
150% Removal of Rated capacity, 10 hours
FOG removed, Maximum of 5% water
Copyright
PDI 2012
FOG Disposal System –
A grease interceptor that reduces
non petroleum fats, oils, and grease
(FOG) in effluent by separation, and
mass and volume reduction.
ASME A112.14.6
Copyright
PDI 2012
Copyright
PDI 2012
Testing
• PDI G101 Grease separation
• ASME A112.14.6 Grease Reduction
• Discharge water 100mg/liter max.
FOG
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Design criteria for Gravity
interceptor, IAPMO Z1001
• Stoke’s Law
• 300 Gallon volume minimum
• Two chambers 2/3 and 1/3
• Two access point Inlet and outlet
• baffle Tee 4” Inlet, outlet above water
• Center baffle
• length more than width
• Air space 9”
• Liquid depth 30” min. 6 ft. max
• Efficiency 80%-85 % range
• Sized by Gallons volume
Copyright
PDI 2012
Copyright
PDI 2012
GRAVITY INTERCEPTOR
BEWARE!
Copyright
PDI 2012
BEWARE!
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
New Definitions
• Grease Interceptor
• Hydro Mechanical
• Gravity
•
Copyright
PDI 2012
• What happened in 2006 to Grease
Traps and passive interceptor?
• Deleted UPC, IPC 2006
Copyright
PDI 2012
Intercepting Grease 2003, 2006 2009 2012
• Trap
A fitting or device that provides a liquid
seal to prevent the emission of sewer
gases without materially affecting the flow
of sewage or wastewater through the trap.
Copyright
PDI 2012
Intercepting Grease
IPC Changes
Copyright
PDI 2012
Intercepting Grease
IPC 2003
IPC 2006
IPC 2009
IPC 2012
Copyright
PDI 2012
Intercepting Grease IPC 2003
• Grease Interceptor
A passive interceptor whose rated flow
exceeds 50 GPM.
Copyright
PDI 2012
Intercepting Grease IPC 2003
• Grease Trap.
A passive interceptor whose rated flow is
50 GPM or less.
Copyright
PDI 2012
Intercepting Grease IPC 2006 2009
• Chapter 2 Definitions
• Grease Interceptor (replaces grease interceptor & grease trap)
A plumbing appurtenance that is installed
in a sanitary drainage system to intercept
oily and greasy wastes from a wastewater
discharge. Such device has the ability to
intercept free-floating fats and oils.
Copyright
PDI 2012
Intercepting Grease IPC 2012
Chapter 2 Definitions Grease Interceptor
Hydro-Mechanical Grease Interceptor. A plumbing appurtenance that
is installed in the sanitary drainage system to intercept freefloating (FOG) fats, oils and grease from the wastewater
discharge. Continuous separation is accomplished by air
entrainment, buoyancy and interior baffles.
Gravity Grease Interceptor. A plumbing appurtenance of not less
than 500 gallon capacity that are installed in the sanitary
drainage system to intercept free-floating (FOG) fats, oils and
grease from the wastewater discharge. Separation is
accomplished by gravity during a retention time of not less
than 30 minute.
Copyright
PDI 2012
Intercepting Grease IPC 2006 2012
•
IPC 1003.3.5 Automatic grease removal
devices. (GRD)
Where automatic grease removal devices are
installed, such devices shall be located downstream
of each fixture or multiple fixtures in accordance
with the manufacturer’s instructions. The automatic
grease removal device shall be sized to pre-treat
the measured or calculated flows for all connected
fixtures or equipment. Ready access shall be
Copyright
provided.
PDI 2012
Intercepting Grease IPC 2006 2012
•
IPC 1003.3.5 Automatic grease removal
devices.
Copyright
Ready access shall be provided.
PDI 2012
Intercepting Grease IPC 2006 2012
•
IPC 1003.3.4.2 Rate of Flow Controls
Shall be equipped with devices to control
the rate of water flow.
Applies to Hydro-Mechanical only
Copyright
PDI 2012
Intercepting Grease
IPC 2006 2009 2012
Rate of Flow Controls
Copyright
PDI 2012
Intercepting Grease
•
IPC 2006 2009 2012
IPC 1003.3.4.1 Grease interceptor capacity
Shall have the grease retention capacity
Table 1003.3.4.1
Applies to Hydro-Mechanical only
Copyright
PDI 2012
Intercepting Grease IPC 2006 2009 2012
• IPC 1003.2 Approval
• The size, type and location of each
interceptor and of each separator shall be
designed and installed in accordance with
the manufacturer’s instructions ……….
Copyright
PDI 2012
Intercepting Grease IPC 2006 2009 2012
• IPC 1003.3.2 Food waste Grinders
A solids interceptor shall separate the
discharge before connecting to the grease
interceptor.
Applies to all grease interceptors
Copyright
PDI 2012
Intercepting Grease, IPC 2006, 2012
• IPC1003.3.4 Grease interceptors and
automatic grease removal devices
Grease interceptors or automatic grease
removal devices shall conform to
PDI G101, ASME A112.14.3 or ASME
A112.14.4 and shall be installed in accordance
with the manufacturer’s instructions.
Note no size limitation
Exception: Volume not less 500 Gallons outside
Copyright
PDI 2012
Intercepting Grease IPC 2012
• 1003.3.4 Hydro-Mechanical Grease
interceptors and automatic grease
removal devices (GRD).
Grease interceptors or automatic grease
removal devices shall conform to PDI G101,
ASME A112.14.3 or ASME A112.14.4 and shall
be installed in accordance with the
manufacturer’s instructions.
Note no size limitation
Copyright
PDI 2012
Intercepting Grease
UPC Changes
Copyright
PDI 2012
Intercepting Grease UPC 2006,
Chapter 2 Definitions Grease Interceptor
Hydro-Mechanical Grease Interceptor. A plumbing appurtenance
that is installed in the sanitary drainage system to intercept
free-floating (FOG) fats, oils and grease from the wastewater
discharge. Continuous separation is accomplished by air
entrainment, buoyancy and interior baffles.
Gravity Grease Interceptor. A plumbing appurtenance of not less
than 300 gallon capacity that are installed in the sanitary
drainage system to intercept free-floating (FOG) fats, oils and
grease from the wastewater discharge. Separation is
accomplished by gravity during a retention time of not less
Copyright
than 30 minute.
PDI 2012
UPC CHANGE
UPC 2003-2006
• What happened to Appendix H ?
• New Sizing method Chapter 10
Copyright
PDI 2012
Flow Control’s
UPC
2006
• 1014.2.1 Each plumbing fixture or piece of
equipment connected to a hydro
mechanical grease interceptor shall be
provided with an approved type of vented
flow control installed in a readily
accessible and visible location.
• No flow-control device having adjustable
or removable parts shall be approved
Copyright
PDI 2012
Grease interceptor Installation
General
• UPC 1014.1.3 Food Waste Disposal Units and
• Dishwashers. Unless specifically required or
permitted by the Authority Having Jurisdiction,
no food waste disposal unit or dishwasher shall
be connected to or discharge into any grease
interceptor. Commercial food waste disposers
shall be permitted to discharge directly into the
building’s drainage system.
Copyright
PDI 2012
Grease interceptor Installation
General
• UPC 1014.1.1 Each fixture discharging
into a grease interceptor shall be
individually trapped and vented in an
approved manner.
Copyright
PDI 2012
Grease interceptor Installation
General
• UPC 1014.3.2.1 Waste discharge in
establishments from fixtures and equipment
which may contain grease, including but not
limited to, scullery sinks, pot and pan sinks,
dishwashers, soup kettles, and floor drains
located in areas where grease-containing
materials may exist, may be drained into the
sanitary waste through the interceptor when
approved by the Authority Having Jurisdiction.
Copyright
PDI 2012
Grease interceptor Installation
General
• UPC 1014.3.4.1 Each grease interceptor shall
be so installed and connected that it shall be
at all times easily accessible for inspection,
cleaning, and removal of the intercepted
grease. A gravity grease interceptor
complying with IAPMO Z1001, shall not be
installed in any part of a building where
food is handled. Location of the grease
interceptor shall meet the approval of the
Authority Having Jurisdiction.
Copyright
PDI 2012
Grease interceptor Installation
General
• UPC 1014.3.4.2 Interceptors shall be
placed as close as practical to the fixtures
they serve.
Copyright
PDI 2012
MAINTAINANCE
• UPC 1014.1.2 The Authority Having
Jurisdiction shall have the authority to
mandate the installation of additional
equipment or devices and to mandate a
maintenance program.
Copyright
Automatic Sensor
PDI 2012
MAINTAINANCE
Grease Removal Device
Copyright
PDI 2012
Copyright PDI 2012
Sizing
GREASE INTERCEPTORS
•Hydro Mechanical
•Gravity
Copyright
PDI 2012
Defining the Sizing
GREASE INTERCEPTORS
•Hydro Mechanical ------ GPM
•Gravity------ Gallons capacity
Copyright
PDI 2012
Size Ranges of
GREASE INTERCEPTORS
Hydro Mechanical ------ GPM
7 to 100 GPM
Gravity------- Gallons capacity
500 Gallons and larger
Copyright
PDI 2012
Sizing
GREASE INTERCEPTORS
For any type of Grease
interceptor drain line flow in
GPM must be determined
Copyright
PDI 2012
Sizing
Gravity GREASE Interceptors
All interceptors are sized by
calculating flow in GPM
•
•
•
Drain pipe capacity
Actual flow
DFU’s
Copyright
PDI 2012
SIZING Grease INTERCEPTORS
Pipe Size
Diameter
¼” slope
by
GPM
2”
.025
19.44
3”
.025
58.67
4”
.025
125.77
5”
.025
229.75
6”
.025
375.47
Copyright
PDI 2012
SIZING Grease INTERCEPTORS
by
• Fixture type
• Fixture size
• Fixture quantity
• Other equipment
Copyright
PDI 2012
SIZING Grease INTERCEPTORS
by
Fixture type
• Sinks that are drained… Drain size
• Pre rinse……………….... Fixture flow
• Food prep……………….. Fixture flow
• Cooking equipment….... Drain size
• Other equipment………. Rated flow
The total= peak flow
Copyright
PDI 2012
Sizing
Gravity GREASE INTERCEPTORS
Applying peak GPM flow to Sizing
Factor of safety?
• 1% of the time flow is at peak
• 75%-90% of flows are 1/3 peak
Copyright
PDI 2012
SIZING Gravity GREASE
INTERCEPTORS
by GPM FLOW
Peak flow GPM X 30 min
Gravity Grease Interceptor. A plumbing appurtenance of not less than
500 gallon capacity that is installed in the sanitary drainage system to
intercept free-floating (FOG) fats, oils and grease from the wastewater
discharge. Separation is accomplished by gravity during a retention
Copyright
time of not less than 30 minute.
PDI 2012
SIZING Gravity GREASE INTERCEPTORS
by DFU’S
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Gravity Grease Interceptor Sizing
DFUs
Interceptor Volume
Pipe size
8
500 gallons
21 (3)
750 gallons
36
1,000 gallons
3”pipe
90 (3)
1,250 gallons
180
1,500 gallons
4” pipe
216
2,000 gallons
307 (3)
2,500 gallons
390
3,000 gallons
5” pipe
428
4,000 gallons
576
5,000 gallons
700
7,500 gallons
6” pipe
2112
10,000 gallons
2640
15,000 gallons
Copyright
PDI 2012
SIZING Gravity GREASE INTERCEPTORS
by DFU’S
• If drainage fixture units (DFUs) are not
known, the interceptor shall be sized
based on the maximum DFUs allowed
for the pipe size connected to the inlet
of the interceptor.
Copyright
PDI 2012
Sizing
Hydro Mechanical Grease
Interceptors
All interceptors are sized by
calculating flow in GPM
•
•
Drain pipe capacity
Actual flow
Copyright
PDI 2012
SIZING Grease INTERCEPTORS
HYDRO MECHANICAL by
Pipe Size
Diameter
¼” slope
GPM
2”
.025
19.44
3”
.025
58.67
4”
.025
125.77
5”
.025
229.75
6”
.025
375.47
Copyright
PDI 2012
SIZING Grease INTERCEPTORS
HYDRO MECHANICAL by Actual fixture, sink
Step 1
Determine the cubic content of the fixture by
multiplying length x width x depth.
A sink 48” long by 24” wide by 12” deep
Cubic content 48 x 24 x 12 = 13,824 cubic inches
Step 2
Determine the capacity in gallons.
1 gal. = 231 cubic inches.
Contents in gal. 13,824 = 59.8 gals
231
Step 3
Determine actual drainage load.
The fixture is usually filled to about 75% of
capacity with waste water. The items being
washed displace about 25% of the fixture
content. Actual drainage load = 75% of the
fixture capacity.
Actual drainage load .75 x 59.8 gals. = 44.9 gals.
Step 4
Determine the flow rate and the drainage. In
general, good practices dictate a one minute
drainage period, however where conditions
permit , a 2 minute period is acceptable.
Drainage period is the actual time required to
completely empty the fixture.
Flow Rate = Actual Drainage Load
Drainage Period
Calculated flow rate for 1 minute period
Flow rate 44.9 gals. = 44.9 GPM
1 Min.
Calculated flow rate for 2 minute period
Flow rate 44.9 gals. = 22.5 GPM
2 Min.
Step 5
Select the interceptor which corresponds to the
flow rate calculated. Note – Select larger size
when flow rate falls between two sizes listed. If
the flow rate is above 50 GPM, select a larger
interceptor.
For 1 minute period
44.9 GPM
For a 2 minute period
22.5 GPM
Copyright
PDI 2012
SIZING Grease INTERCEPTORS
HYDRO MECHANICAL by Actual fixture
• Pre rinse…………………Fixture flow
• Food prep………………..Fixture flow
• Cooking equipment…....Drain size
• Other equipment……....Rated flow
• Actual sink capacity@ one/two minute
Note: Sink drain by Manning may have lower flow
The total= peak flow
Copyright
PDI 2012
Sizing
Hydro Mechanical Grease
Interceptors
GPM peak flow =GPM size Interceptor
Note: flow control limits sink GPM
Hydro-Mechanical Grease Interceptor. A plumbing appurtenance that is
installed in the sanitary drainage system to intercept free-floating
(FOG) fats, oils and grease from the wastewater discharge.
Continuous separation is accomplished by air entrainment,
buoyancy and interior baffles.
Copyright
PDI 2012
SIZING GREASE INTERCEPTORS
Under sizing can be a problem
• Increased drain down time
• More frequent cleaning
Copyright
PDI 2012
SIZING GREASE INTERCEPTORS
Over sizing can be a problem
• Grease Breaks down
• Increased cleaning cost
Low Water exchange
pump truck size
Copyright
PDI 2012
Polar Hydrocarbon
 Free fatty acids.
 Glycerin
Copyright
PDI 2012
FOG breaks down into Fatty
acids and Glycerin
 Hydrolisis
 Microbes
 Chemicals
Copyright
PDI 2012
Fatty acids
 Harden with Iron oxide
 Chemically bond to pipes
 Fatty acids are corrosive
 Saturated fatty acids reacting
with Calcium forming a solid
tacky substance
Copyright
PDI 2012
Harden with Iron oxide
Chemically bond to pipes
Copyright
PDI 2012
Saturated fatty acids reacting
with Calcium forming a solid
tacky substance
Copyright
PDI 2012
FOG/Food breaks down
Copyright
PDI 2012
Over sizing
 Increased cost of cleaning
 Over sizing encourages less
frequent cleaning
 Less water exchange, septic
conditions, low Ph.
Copyright
PDI 2012
FOG/Food breaks down
 Sulfur reducing anaerobic
bacteria
 Hydrogen sulfide
 Symbiotic aerobic bacteria
 Sulfuric acid
Copyright
PDI 2012
HOW THEY WORK
Copyright
PDI 2012
.A
plumbing appurtenance that is installed in the
sanitary drainage system to intercept free-floating
(FOG) fats, oils and grease from the wastewater
discharge. Continuous separation is accomplished by
air entrainment, buoyancy and interior baffles.
. A plumbing
appurtenance of not less than 500 gallon capacity that
are installed in the sanitary drainage system to
intercept free-floating (FOG) fats, oils and grease
from the wastewater discharge. Separation is
accomplished by gravity ( buoyancy ) during a Copyright
retention time of not less than 30 minute.
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Gravity Grease Interceptors
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Special applications (Multi-ceptor)
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Vented Flow Control
Copyright
PDI 2012
FLOW CONTROL
 At a level of 18”-36” below the fixture.
 Between the fixture and Grease Interceptor
 One flow control per Grease Interceptor
Copyright
PDI 2012
GREASE REMOVAL DEVICE “GRD”
Skimmer / Timer
Copyright
PDI 2012
GREASE REMOVAL DEVICE “GRD”
Copyright
PDI 2012
GREASE REMOVAL DEVICE “GRD”
Copyright
PDI 2012
FOG Disposal System
A grease interceptor that reduces
non petroleum fats, oils, and grease
(FOG) in effluent by separation, and
mass and volume reduction.
ASME A112.14.6
Copyright
PDI 2012
FOG DISPOSAL SYSTEM
Copyright
PDI 2012
•
•
•
•
•
•
•
•
•
•
Standards •
Flow
•
Min. Size
•
Flow control •
Vent
•
Grinders
•
Certification •
Location
•
Cleaning
•
Yes
•
Any
No
Yes
Yes
No
Yes
Any
Empty
Yes
Any
•
•
•
•
•
•
•
300
No
No
No
Yes
Outdoors
Empty
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
Copyright
PDI 2012
•
•
•
•
•
General
No Garbage/ food grinder directly
connected
Avoid high detergent fixtures
Easy access for cleaning
Check for correct AHJ
Check for local required interceptor
designs
Copyright
PDI 2012
General
• Avoid distances of greater than 25 ft
• Gravity and Hydro can be used together
• Gravity installed outside of building
Copyright
PDI 2012
•
•
•
•
•
•
•
•
•
•
Standards •
Flow
•
Min. Size
•
Flow control •
Vent
•
Grinders
•
Certification •
Location
•
Cleaning
•
Yes
•
Any
No
Yes
Yes
No
Yes
Any
Empty
Yes
Any
•
•
•
•
•
•
•
300
No
No
No
Yes
Outdoors
Empty
Copyright
PDI 2012
Copyright PDI 2012
•New Awareness
•Clean Water Act
•Regulations
•Research
•Technology available
•Design considerations
Copyright
PDI 2012
New Awareness
Copyright
PDI 2012
What problems it cause ?
SSO Sanitary Sewer overflows
"SSO", are a violation of the
Federal Clean Water Act. These
SSO’s have resulted in millions
of dollars in fines by the EPA
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
In Orange County, CA, 252 orders have
been issued, closing beaches for more
than 2000 days (from 1987 through 2000).
The majority of these closures were the
result of bacterial contamination from
sewage spills flowing into the ocean,
usually originating from sewer lines
clogged with grease. This is almost 6
years of closure.
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
SSO Sanitary Sewer overflows
2006
EPA has reported in monitoring
35 States there were 40,000
beach day closings in the year
2006, due to contamination.
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
Los Angeles County Sanitation
Districts are fined $4.6 million for
January 2006 sewage spill. Agreed
to a $2.5 million settlement and
released from liability for 93 sewage
spill over the previous five years.
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
• Connecticut
• 1999-2003
• 2200 SSO’s
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
Regulations
• State
• Plumbing Code
• Public Health Code
• POTW
• City
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
Enforcement
• AHJ
• BY State
• Within the State
• BY Sewer Company
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
• Studies
• Orange County FOG Control 2005
• NC State Project FROG 2007
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
Orange County Study
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
Orange County
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
• NC State Project FROG 2007
FOG blockages are the primary
cause in 40% to 50% of all SSO’s
(Southerland,2002)
Another 10% to 25% are roots
and grease
Copyright
PDI 2012
SSO
Sanitary Sewer overflows
• NC State Project FROG 2007
50% to 75%
Copyright
PDI 2012
•
•
•
•
•
•
•
•
Were does it come from
Food preparation and clean up
Schools
Assisted Living
Nursing homes
Hospitals
Amusement Parks
Malls
Restaurants
Copyright
PDI 2012
How much?
•
•
•
•
Cafeteria 4,500 mg/L
Chinese 1,900 mg/L
Italian
1,000 mg/L
American 950 mg/L
Copyright
PDI 2012
New Awareness
Reference / Information
Water Environment Research Foundation
www.WERF.org
Plumbing and Drainage Institute
www.PDIonLine.org
Copyright
PDI 2012
Myths and Facts
Copyright
PDI 2012
• Myth: If grease is not used in food
preparation a grease interceptor is not
needed
• Fact: Grease is not the only problem. The
overall problem is FOG . (Fats, oils and
grease). These materials alone or in
combination will result is sewer blockages
Copyright
PDI 2012
• Myth: If food is not prepared on site a
grease interceptor is not needed
• Fact: A stove is not the source of
FOG, it is the sink. Containers and
utensils can be a significant source of
FOG
Copyright
PDI 2012
• Myth: Grease interceptors only retain
FOG
• Fact: In addition to FOG grease
interceptors will capture food solids.
Copyright
PDI 2012
• Myth: Choosing a larger size grease
interceptor will result in a greater grease
removal efficiency.
• Fact: When grease interceptor has been
sized properly to the anticipated maximum
flow using a grease interceptor with a larger
flow capacity will not increase grease
removal efficiency.
Copyright
PDI 2012
• Myth: The larger the grease storage
capacity the more efficient the
interceptors grease removal.
• Fact: Grease must be separated from
the waste water before it can be stored.
Storage capacity and grease removal
efficiency are not related.
Copyright
PDI 2012
Myth: The grease must cool and harden
to separate from the waste water.
• Fact: Grease interceptors separate
based on the difference in specific
gravity of FOG and water. Liquefied
grease floats just as well as solidified
grease. Grease is lighter than water. Copyright
PDI 2012
• Myth: Hot water will melt the captured
grease and wash the grease through
the interceptor
• Fact: All hydro mechanical grease
interceptors are tested for grease
removal efficiency with 150°F water.
Copyright
PDI 2012
• Myth: Low temperature dish washers can
connect to the grease interceptor.
• Fact: All dishwashers can be problematic. It
is not the temperature but the soaps,
detergents and sanitizers that emulsify the
FOG.
Copyright
PDI 2012
• Myth: It is important to connect floor drains to
the grease interceptor.
• Fact: Floor drains are not usually a significant
source of FOG. Drain cleaners and strong
cleaning agents used on floors can emulsify
FOG already captured in a grease interceptor.
Copyright
PDI 2012
• Myth: Once the grease is captured in the
interceptor, it will remain captured in the
interceptor as long as the interceptor is not yet
25% full.
• Fact: Because the grease (FOG) is contaminated
with food particles and the interceptor is a
breeding ground for bacteria, the FOG can be
broken down, exit the interceptor and create
blockages downstream.
Copyright
PDI 2012
• Myth: Over sizing an interceptor cannot
hurt.
• Fact: Over sizing an interceptor relative to actual
flow is a problem. It can result in the generation of
hydrogen sulfide gas that can convert to an acid.
Both metal and concrete structures downstream
have suffered severe structural damage from this
acid.
Copyright
PDI 2012
• Myth: When the grease interceptor is full, the
drain line will stop flowing.
• Fact: Water will continue to flow even when the
FOG in the interceptor is at capacity. Additional
grease in the wastewater will simply flow right
through the interceptor. Grease interceptors must
be either manually or electronically monitored.
Copyright
PDI 2012
• Myth: With the change to healthier cooking oils,
there is less of a FOG problem.
• Fact: Cooking oils that are healthier for you are
no healthier for the drainage system. They are all
polar hydrocarbons. In fact, some of the new
alternative cooking oils with specific gravities
closer to water will be harder to capture from the
Copyright
wastewater.
PDI 2012
• Myth: A clogged drain and clean out is the worst
that can happen.
• Fact: FOG can can cause extensive sewer failure
and costly repairs.
Copyright
PDI 2012
Copyright
PDI 2012
• Myth: Grease does not clog plastic pipe
• Fact: FOG can create blockages in all
drain pipe materials.
Copyright
PDI 2012
Copyright
PDI 2012
THANK YOU
Copyright
PDI 2012

similar documents