La. Food Processors La. Food Processors ConferenceConference

Facility Upgrade and Facility Upgrade and Expansion Considerations for Expansion Considerations for Treatment of Process WasteTreatment of Process Waste

Todd Farrar, P.E.M.Todd Farrar, P.E.M.

General Engineering & General Engineering & Environmental Companies, Environmental Companies,

Inc.Inc.

TopicsTopics

• Considerations For Upgrade or Considerations For Upgrade or Expansion of Process Waste Expansion of Process Waste Treatment Facilities Treatment Facilities – WastewaterWastewater– Solid WasteSolid Waste

Should You Treat Your Should You Treat Your Wastewater or Not?Wastewater or Not?

• Wastewater Disposal OptionsWastewater Disposal Options– Discharge Directly to Waterbody with Discharge Directly to Waterbody with

TreatmentTreatment– Discharge to Publicly Owned Treatment Discharge to Publicly Owned Treatment

Works (POTW) without TreatmentWorks (POTW) without Treatment– Discharge to POTW with Pre-TreatmentDischarge to POTW with Pre-Treatment

Discharging Directly to Discharging Directly to WaterbodyWaterbody

• AdvantagesAdvantages– Only choice if Only choice if

facility is not close facility is not close to POTW collection to POTW collection systemsystem

– There are no There are no surcharges to paysurcharges to pay

• DisAdvantagesDisAdvantages– Operation and Operation and

Maintenance of Maintenance of system can be costlysystem can be costly

– Much lower effluent Much lower effluent limits than POTW limits than POTW (Typically 30 or 45 (Typically 30 or 45 mg/l BODmg/l BOD55 and TSS) and TSS)

– Requires NPDES Requires NPDES PermitPermit

Discharging to POTW without Discharging to POTW without Treating WastewaterTreating Wastewater

• AdvantagesAdvantages– No Capital Cost for No Capital Cost for

Treatment FacilitiesTreatment Facilities– No Operation and No Operation and

Maintenance Costs Maintenance Costs

• DisadvantageDisadvantage– Expensive Expensive

Surcharges Surcharges

Discharging to POTW with Pre-Discharging to POTW with Pre-TreatmentTreatment

• AdvantagesAdvantages– Lower or No Excess Lower or No Excess

Sewerage Strength Sewerage Strength SurchargesSurcharges

• DisadvantagesDisadvantages– Initial Capital Initial Capital

ExpenditureExpenditure– Higher Operations Higher Operations

and Maintenance and Maintenance CostsCosts

Typical POTW SurchargesTypical POTW Surcharges

Sewerage and Water Board of New Sewerage and Water Board of New OrleansOrleans

Excess Sewerage FormulaExcess Sewerage Formula

Charge = (Volume in million gallons x Charge = (Volume in million gallons x 8.34) x ($0.2092(Actual BOD5 – 285 8.34) x ($0.2092(Actual BOD5 – 285 mg/l) + ($0.1397(Actual TSS – 395 mg/l) + ($0.1397(Actual TSS – 395 mg/l)mg/l)

Example SurchargeExample Surcharge

• 1 Million Gallons of Wastewater 1 Million Gallons of Wastewater

• BODBOD55 of 600 mg/l & TSS of 500 mg/l of 600 mg/l & TSS of 500 mg/l

CalculationsCalculations

(1.0 x 8.34) x ($0.2092 x (600 – 285) +(1.0 x 8.34) x ($0.2092 x (600 – 285) +

($0.1397 x (500 – 395) = 8.34 x ($0.1397 x (500 – 395) = 8.34 x ($65.90 +($65.90 +

14.67) = $671.9614.67) = $671.96

Wastewater ReductionWastewater Reduction

• Recycle Wastewater Recycle Wastewater – POTW’s base Surcharges on Water UsagePOTW’s base Surcharges on Water Usage– Wastewater can be treated and reusedWastewater can be treated and reused

•Typically water cost about $2,000.00 per million Typically water cost about $2,000.00 per million gallons (depending on location)gallons (depending on location)

– Process changes to reduce usage Process changes to reduce usage – Isolate “Clean” or non-process wastewater Isolate “Clean” or non-process wastewater

to be directed to Stormwater systemto be directed to Stormwater system

Solid WasteSolid Waste

• Only other significant source of Only other significant source of pollution in Seafood Processingpollution in Seafood Processing

• Recycled for use in mulchesRecycled for use in mulches• Alternative uses Alternative uses

– Chitosan derived from Chitin found in Chitosan derived from Chitin found in crustacean shells has been used for:crustacean shells has been used for:•Clean stormwaterClean stormwater•Fat-blockers in diet pillsFat-blockers in diet pills•Thicken food, paint and makeupThicken food, paint and makeup