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CAPTURING the GREASE MODEL CODE EDITION Copyright PDI 2012.

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1 CAPTURING the GREASE MODEL CODE EDITION Copyright PDI 2012

2 Hydro Mechanical vs Gravity Hydro Mechanical vs Gravity Grease Interceptors UPC, IPCGrease Interceptors UPC, IPC How they workHow they work SizingSizing InstallationInstallation GreaseGrease What it is What it is Were does it come from Were does it come from What problems it cause What problems it cause Copyright PDI 2012

3 Copyright PDI 2012

4 PDI Plumbing and Drainage Institute The Plumbing and Drainage Institute (PDI) was formed in 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

5 PDI Plumbing and Drainage Institute Our objective Advancement of Engineered Plumbing Products Research Publish Standards Education Copyright PDI 2012

6 PDI Plumbing and Drainage Institute We also participate in the development of the model plumbing codes UPC, IPC, NSPC Copyright PDI 2012

7 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

8 PDI Plumbing and Drainage Institute Copyright PDI 2012

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10 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

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13 Grease Interceptor is a generic term representing a family of devices Copyright PDI 2012

14 Grease Interceptor 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

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39 Example 25 GPM Interceptor Two sinks each at 25 Gallons at 160 F Copyright PDI 2012

40 Example 25 GPM Interceptor Two sinks each at 25 Gallons at 160 F Copyright PDI 2012

41 Lard Ratio One Pound/ Five Gallons Five Pounds of Lard each Run at 160F Copyright PDI 2012

42 Min. of 12 Runs per Test Total Lard min.60 Pounds per Test Copyright PDI 2012

43 Min. Retained Lard Pounds Grease removal efficiency 90%-95% Copyright PDI 2012

44 Min. Retained Lard Pounds Grease removal efficiency 90%-95% Copyright PDI 2012

45 Lard is Skimmed and separated Copyright PDI 2012

46 Lard is Skimmed and separated Copyright PDI 2012

47 Efficiency = Grease Added - Grease Skimmed Grease added Copyright PDI 2012

48 Testing and Certification Copyright PDI 2012

49 Testing and Certification Testing and Certification Performance Performance Copyright PDI 2012

50 Testing and Certification Testing and Certification Performance Performance Copyright PDI 2012

51 Orange County Study Copyright PDI 2012

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55 Hydro mechanical grease interceptorHydro mechanical grease interceptor External grease collectionExternal grease collection Timer actuatedTimer actuated Sensor operatedSensor operated Skim off greaseSkim off grease Disc Disc Belt Belt Hydraulic Hydraulic Pump Pump Copyright PDI 2012

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59 Hydro mechanical grease interceptorHydro mechanical grease interceptor Test PDI G101 Grease separatingTest PDI G101 Grease separating ASME A Grease removalASME A Grease removal 150% Removal of Rated capacity, 10 hours150% Removal of Rated capacity, 10 hours FOG removed, Maximum of 5% waterFOG removed, Maximum of 5% water Copyright PDI 2012

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65 Design criteria for Gravity interceptor, IAPMO Z1001 Design criteria for Gravity interceptor, IAPMO Z1001 Stoke’s Law 300 Gallon volume minimum 300 Gallon volume minimum Two chambers 2/3 and 1/3 Two chambers 2/3 and 1/3 Two access point Inlet and outlet Two access point Inlet and outlet baffle Tee 4” Inlet, outlet above water baffle Tee 4” Inlet, outlet above water Center baffle Center baffle length more than width length more than width Air space 9” Air space 9” Liquid depth 30” min. 6 ft. max Liquid depth 30” min. 6 ft. max Efficiency 80%-85 % range Efficiency 80%-85 % range Sized by Gallons volume Sized by Gallons volume Copyright PDI 2012

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67 GRAVITY INTERCEPTOR BEWARE! Copyright PDI 2012

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71 New Definitions New Definitions Grease InterceptorGrease Interceptor Hydro Mechanical Hydro Mechanical GravityGravity Copyright PDI 2012

72 What happened in 2006 to Grease TrapsWhat happened in 2006 to Grease Traps and passive interceptor? Deleted UPC, IPC 2006 Copyright PDI 2012

73 Intercepting Grease 2003, Intercepting Grease 2003, TrapTrap 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 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

74 Intercepting Grease Intercepting Grease IPC Changes Copyright PDI 2012

75 Intercepting Grease Intercepting Grease IPC 2003 IPC 2006 IPC 2009 IPC 2012 Copyright PDI 2012

76 Intercepting Grease IPC 2003 Intercepting Grease IPC 2003 Grease InterceptorGrease Interceptor A passive interceptor whose rated flow exceeds 50 GPM. Copyright PDI 2012

77 Intercepting Grease IPC 2003 Intercepting Grease IPC 2003 Grease Trap.Grease Trap. A passive interceptor whose rated flow is 50 GPM or less. A passive interceptor whose rated flow is 50 GPM or less. Copyright PDI 2012

78 Intercepting Grease IPC Intercepting Grease IPC Chapter 2 DefinitionsChapter 2 Definitions Grease InterceptorGrease 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

79 Intercepting Grease IPC 2012 Intercepting Grease IPC 2012 Chapter 2 Definitions Chapter 2 Definitions Grease Interceptor Hydro-Mechanical 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. 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

80 Intercepting Grease IPC Intercepting Grease IPC IPC 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 provided. Copyright PDI 2012

81 Intercepting Grease IPC Intercepting Grease IPC IPC Automatic grease removal devices. Ready access shall be provided. Copyright PDI 2012

82 Intercepting Grease IPC Intercepting Grease IPC IPC Rate of Flow Controls IPC Rate of Flow Controls Shall be equipped with devices to control the rate of water flow. Applies to Hydro-Mechanical only Copyright PDI 2012

83 Intercepting Grease IPC Intercepting Grease IPC Rate of Flow Controls Rate of Flow Controls Copyright PDI 2012

84 Intercepting Grease IPC Intercepting Grease IPC IPC Grease interceptor capacity IPC Grease interceptor capacity Shall have the grease retention capacity Table Applies to Hydro-Mechanical only Copyright PDI 2012

85 IPC ApprovalIPC 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

86 Intercepting Grease IPC Intercepting Grease IPC IPC Food waste GrindersIPC Food waste Grinders A solids interceptor shall separate the discharge before connecting to the grease interceptor. Applies to all grease interceptors Copyright PDI 2012

87 Intercepting Grease, IPC 2006, 2012 Intercepting Grease, IPC 2006, 2012 IPC Grease interceptors and automatic grease removal devicesIPC Grease interceptors and automatic grease removal devices Grease interceptors or automatic grease removal devices shall conform to PDI G101, ASME A or ASME A and shall be installed in accordance with the manufacturer’s instructions. Note no size limitation Note no size limitation Exception: Volume not less 500 Gallons outside Copyright PDI 2012

88 Intercepting Grease IPC 2012 Intercepting Grease IPC Hydro-Mechanical Grease interceptors and automatic grease removal devices (GRD) Hydro-Mechanical Grease interceptors and automatic grease removal devices (GRD). Grease interceptors or automatic grease removal devices shall conform to PDI G101, ASME A or ASME A and shall be installed in accordance with the manufacturer’s instructions. Grease interceptors or automatic grease removal devices shall conform to PDI G101, ASME A or ASME A and shall be installed in accordance with the manufacturer’s instructions. Note no size limitation Copyright PDI 2012

89 Intercepting Grease Intercepting Grease UPC Changes Copyright PDI 2012

90 Intercepting Grease UPC 2006, Chapter 2 Definitions Intercepting Grease UPC 2006, Chapter 2 Definitions Grease Interceptor Hydro-Mechanical 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. 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 than 30 minute. Copyright PDI 2012

91 UPC CHANGE UPC What happened to Appendix H ?What happened to Appendix H ? New Sizing method Chapter 10New Sizing method Chapter 10 Copyright PDI 2012

92 Flow Control’s UPC 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

93 Grease interceptor Installation General UPC 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

94 Grease interceptor Installation General UPC Each fixture discharging into a grease interceptor shall be individually trapped and vented in an approved manner. Copyright PDI 2012

95 Grease interceptor Installation General UPC 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

96 Grease interceptor Installation General UPC 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

97 Grease interceptor Installation General UPC Interceptors shall be placed as close as practical to the fixtures they serve. Copyright PDI 2012

98 MAINTAINANCE UPC The Authority Having Jurisdiction shall have the authority to mandate the installation of additional equipment or devices and to mandate a maintenance program. Automatic Sensor Copyright PDI 2012

99 MAINTAINANCE Grease Removal Device Copyright PDI 2012

100 Copyright PDI 2012

101 Sizing GREASE INTERCEPTORS Hydro MechanicalHydro Mechanical GravityGravity Copyright PDI 2012

102 Defining the Sizing GREASE INTERCEPTORS Hydro Mechanical GPMHydro Mechanical GPM Gravity Gallons capacityGravity Gallons capacity Copyright PDI 2012

103 Size Ranges of GREASE INTERCEPTORS Hydro Mechanical GPM 7 to 100 GPM Gravity Gallons capacity 500 Gallons and larger Copyright PDI 2012

104 Sizing GREASE INTERCEPTORS For any type of Grease interceptor drain line flow in GPM must be determined Copyright PDI 2012

105 All interceptors are sized by calculating flow in GPM Drain pipe capacity Actual flow DFU’s Sizing Gravity GREASE Interceptors Copyright PDI 2012

106 Pipe Size Diameter ¼” slope GPM 2” ” ” ” ” Copyright PDI 2012

107 Fixture type Fixture size Fixture quantity Other equipment Copyright PDI 2012

108 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

109 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 Sizing Gravity GREASE INTERCEPTORS Copyright PDI 2012

110 SIZING Gravity GREASE INTERCEPTORS by GPM FLOW Peak flow GPM X 30 min Gravity Grease Interceptor. 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 time of not less than 30 minute. Copyright PDI 2012

111 SIZING Gravity GREASE INTERCEPTORS by DFU’S Gravity Grease Interceptor Sizing DFUs Interceptor Volume Pipe size 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 ,000 gallons ,000 gallons Copyright PDI 2012

112 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

113 All interceptors are sized by calculating flow in GPM calculating flow in GPM Drain pipe capacityDrain pipe capacity Actual flowActual flow Sizing Hydro Mechanical Grease Sizing Hydro Mechanical Grease Interceptors Interceptors Copyright PDI 2012

114 Pipe Size Diameter ¼” slope ¼” slope GPM GPM 2” 2” 2” 2” ” 3” 3” 3” ” 4” 4” 4” ” 5” 5” 5” ” 6” 6” 6” Copyright PDI 2012

115 SIZING Grease INTERCEPTORS HYDRO MECHANICAL by Actual fixture, sink Step 1Determine 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 2Determine the capacity in gallons. 1 gal. = 231 cubic inches. Contents in gal. 13,824 = 59.8 gals 231 Step 3Determine 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 4Determine 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 5Select 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

116 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 one/two minute Note: Sink drain by Manning may have lower flow The total= peak flow Copyright PDI 2012

117 GPM peak flow =GPM size Interceptor Note: flow control limits sink GPM Hydro-Mechanical 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. Sizing Hydro Mechanical Grease Interceptors Interceptors Copyright PDI 2012

118 Under sizing can be a problem Increased drain down time More frequent cleaning Copyright PDI 2012

119 Over sizing can be a problem Grease Breaks down Low Water exchange Increased cleaning cost pump truck size Copyright PDI 2012

120 Polar Hydrocarbon  Free fatty acids.  Glycerin Copyright PDI 2012

121 FOG breaks down into Fatty acids and Glycerin   Hydrolisis   Microbes   Chemicals Copyright PDI 2012

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123 Harden with Iron oxide Chemically bond to pipes Copyright PDI 2012

124 Saturated fatty acids reacting with Calcium forming a solid tacky substance Saturated fatty acids reacting with Calcium forming a solid tacky substance Copyright PDI 2012

125 FOG/Food breaks down Copyright PDI 2012

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127 FOG/Food breaks down  Sulfur reducing anaerobic bacteria bacteria  Hydrogen sulfide  Symbiotic aerobic bacteria  Sulfuric acid Copyright PDI 2012

128 HOW THEY WORK Copyright PDI 2012

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140 FLOW CONTROL At a level of 18”-36” below the fixture. At a level of 18”-36” below the fixture. Between the fixture and Grease Interceptor Between the fixture and Grease Interceptor One flow control per Grease Interceptor One flow control per Grease Interceptor Copyright PDI 2012

141 GREASE REMOVAL DEVICE “GRD” Copyright PDI 2012

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143 GREASE REMOVAL DEVICE “GRD” Copyright PDI 2012

144 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 A Copyright PDI 2012

145 FOG DISPOSAL SYSTEM Copyright PDI 2012

146 StandardsStandards FlowFlow Min. SizeMin. Size Flow controlFlow control VentVent GrindersGrinders CertificationCertification LocationLocation CleaningCleaning YesYes AnyAny NoNo YesYes NoNo YesYes AnyAny EmptyEmpty YesYes AnyAny NoNo YesYes OutdoorsOutdoors EmptyEmpty Copyright PDI 2012

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162 General 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

163 General General Avoid distances of greater than 25 ft Gravity and Hydro can be used together Gravity installed outside of building Copyright PDI 2012

164 StandardsStandards FlowFlow Min. SizeMin. Size Flow controlFlow control VentVent GrindersGrinders CertificationCertification LocationLocation CleaningCleaning YesYes AnyAny NoNo YesYes NoNo YesYes AnyAny EmptyEmpty YesYes AnyAny NoNo YesYes OutdoorsOutdoors EmptyEmpty Copyright PDI 2012

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166 New AwarenessNew Awareness Clean Water ActClean Water Act RegulationsRegulations ResearchResearch Technology availableTechnology available Design considerationsDesign considerations Copyright PDI 2012

167 New Awareness New Awareness Copyright PDI 2012

168 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

169 SSO Sanitary Sewer overflows Copyright PDI 2012

170 SSO Sanitary Sewer overflows Copyright PDI 2012

171 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

172 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

173 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

174 SSO Sanitary Sewer overflows Connecticut SSO’s Copyright PDI 2012

175 SSO Sanitary Sewer overflows Regulations State Plumbing Code Public Health Code POTW City Copyright PDI 2012

176 SSO Sanitary Sewer overflows Enforcement AHJ BY State Within the State BY Sewer Company Copyright PDI 2012

177 SSO Sanitary Sewer overflows Studies Orange County FOG Control 2005 NC State Project FROG 2007 Copyright PDI 2012

178 SSO Sanitary Sewer overflows Copyright PDI 2012

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180 SSO Sanitary Sewer overflows Orange County Study Copyright PDI 2012

181 SSO Sanitary Sewer overflows Orange County Copyright PDI 2012

182 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

183 SSO Sanitary Sewer overflows NC State Project FROG % to 75% Copyright PDI 2012

184 Were does it come from Food preparation and clean upFood preparation and clean up SchoolsSchools Assisted LivingAssisted Living Nursing homesNursing homes HospitalsHospitals Amusement ParksAmusement Parks MallsMalls RestaurantsRestaurants Copyright PDI 2012

185 How much? Cafeteria 4,500 mg/LCafeteria 4,500 mg/L Chinese 1,900 mg/LChinese 1,900 mg/L Italian 1,000 mg/LItalian 1,000 mg/L American 950 mg/LAmerican 950 mg/L Copyright PDI 2012

186 New Awareness Reference / Information Water Environment Research Foundation Plumbing and Drainage Institute Copyright PDI 2012

187 Myths and Facts Copyright PDI 2012

188 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

189 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

190 Myth: Grease interceptors only retain FOG Fact: In addition to FOG grease interceptors will capture food solids. Copyright PDI 2012

191 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

192 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

193 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

194 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

195 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

196 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

197 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

198 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

199 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

200 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 wastewater. Copyright PDI 2012

201 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

202 Copyright PDI 2012

203 Myth: Grease does not clog plastic pipe Fact: FOG can create blockages in all drain pipe materials. Copyright PDI 2012

204 Copyright PDI 2012

205 THANK YOU Copyright PDI 2012


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