wastewater

• PROVIDING WATER RECIRCULATION & WASTEWATER TREATMENT TECHNOLOGIES •

• SERVING THE LAND-BASED AQUACULTURE & FISH PROCESSING INDUSTRIES •

• PROCESSING WASTEWATER OVERVIEW

• PROCESSING WASTEWATER TREATMENT

• PROCESSING WASTEWATER DISINFECTION

• IMPORTANT CONSIDERATIONS

SALMON PROCESSING WASTEWATER TREATMENT AND DISINFECTION TECHNOLOGY

INTRODUCTION

• SOURCES

• VOLUMES

• CHARACTERISTICS

• CHALLENGES

PROCESSING WASTEWATER OVERVIEW


• Harvest bloodwater

• Processing line wastewater

• Processing area clean-up water

• Storm water runoff from outdoor transfer areas

SOURCES



• Industry average is ~ 6 litres of wastewater generated per kg of salmon processed.

VOLUMES



Processing Line Wastewater (80%)

Harvest Bloodwater (10%)

Processing Wastewater Sources

Processing Wastewater Sources

Clean Up Water (7%)

Transfer Area Runoff (3%)

• BOD - can range from ± 1500 mg/l (multi-source wastewater) to ± 6000 mg/l (harvest bloodwater).

• TSS - can range from ± 500 mg/l (multi-source wastewater) to ± 1500 mg/l (harvest bloodwater).

• FOG - can range from ± 100 mg/l (multi-source wastewater) to ± 1500 mg/l (harvest bloodwater)..

• Salinity - depends upon processing water source.

• Temperature - typically < 10° C.

• Disease - varies from region to region (ie. ISA, IPN, etc.).

CHARACTERISTICS



• Variability

• Cleaning agents

• Temperature

• Salinity

• Fats and oils

• “Catch all” approach

CHALLENGES



• Collection

• Filtration

• Equalization

• Pretreatment

• Separation

PROCESSING WASTEWATER TREATMENT


MAJOR PROCESS STEPS IN PROCESS FLOW

• All processing wastewater sources directed to a common collection point.

• Typical common collection point is a concrete sump equipped with submersible pump that is capable of handling heavy solids loading.

COLLECTION



• Microscreen belt filter for primary treatment.

• Removes suspended solids larger than 350 microns in particle size.

• Reduces BOD, TSS, and FOG by up to 50%.

FILTRATION



• Primary storage tank - typically sized to hold total volume of processing wastewater generated in one processing day.

• Recirculation or aeration employed to continuously mix tank contents.

EQUALIZATION



• Accommodates batch processing and eliminates processing wastewater variability as a factor when operating as a flow through treatment system.

• Introduction of dissolved air.

• Addition of chemicals:

• All chemical addition and mixing prior to separation.

PRETREATMENT : proses pisah dgn proses fisika atau kimia

• Coagulation

• Flocculation

• pH adjustment



• Dissolved Air Flotation (DAF).

• Fine bubbles float precipitated particles to surface where they are skimmed off.

• Further reduces BOD, TSS and FOG.

• Well proven technology for meeting effluent quality regulations.

SEPARATION



• Filtration

• Equalization

• Chlorination

• Dechlorination

PROCESSING WASTEWATER DISINFECTION


MAJOR PROCESS STEPS IN PROCESS FLOW

• Collection

• Identical to steps already covered under Processing Wastewater Treatment.

COLLECTION / FILTRATION / EQUALIZATION



• Accredited by the National Veterinary Institute of Norway to kill ISA and other viruses.

• Disinfection dosage typically 50 ppm.

CHLORINATION



• Disinfection contact time typically 15 minutes.

• ORP used to monitor and control disinfection process.

• Required in most jurisdictions through environmental protection legislation.

• Dechlorination to < 0.5 ppm chlorine residual typically required.

• Dechlorination chemical is injected in-line as disinfection tank is discharged.

DECHLORINATION



• Integration

• Automation

• Flexibility

• Reliability

• Affordability

IMPORTANT CONSIDERATIONS


THINGS TO LOOK FOR WHEN SELECTING A SYSTEM

• If a processing wastewater treatment system is installed, it should be designed to integrate disinfection as an “add-in” component at a later date.

INTEGRATION



• If a processing wastewater disinfectionsystem is installed, it should be designed to integrate treatment as an “add-in” component at a later date.

• The system should be PLC based for maximum automation, control and monitoring capability.

• All critical operating information should be recorded by a data logger for troubleshooting, performance and regulatory compliance purposes.

AUTOMATION



• The system should be equipped with a modem and dedicated phone line for remote access to monitor and control its operation.

• System should be flexible to accommodate new discharge restrictions and/or biosecurity concerns with minimal modifications.

• System layout should be flexible to accommodate existing spaces where necessary.

• System chemical requirements should have some flexibility to accommodate local constraints related to cost and availability.

FLEXIBILITY



• All equipment and components should be designed and selected for continuous operation in an industrial wastewater treatment environment.

• The system should be designed to facilitate regular maintenance and minimize

down-time when repairs are required.

RELIABILITY



• Reliable service is as important as a reliable system - system suppliers must be able to provide dependable after-sale support.

Capital cost dependant upon:

• Treatment requirements

• Disinfection requirements

• System flow capacity requirements

• Site specifics.

Chemical Operating Cost Estimates:

• Treatment : < $ 0.005 / US gallon

AFFORDABILITY



• Disinfection : < $ 0.002 / US gallon

• Salmon processing wastewater presents unique challenges that must be taken into consideration when designing a treatment or disinfection system.

• Processing wastewater treatment is designed to reduce levels of BOD, TSS, and FOG to below regulated discharge requirements.

• Processing wastewater from all sources should be minimized to reduce both capital and operating costs.

RECAP


• Processing wastewater treatment and disinfection can be integrated into one complete system that addresses both regulated water quality parameters and biosecurity.

• A quality system for processing wastewater treatment and/or disinfection should be automated, flexible, reliable, and affordable.

• Processing wastewater disinfection is designed to kill disease causing bacteria and viruses prior to discharge.

RECAP


• PROVIDING WATER RECIRCULATION & WASTEWATER TREATMENT TECHNOLOGIES •

• SERVING THE LAND-BASED AQUACULTURE & FISH PROCESSING INDUSTRIES •

wastewater

Documents

litres of wastewater

processing day

processing water source

mgl multisource wastewater

primary treatment

treatment system

mgl harvest bloodwater

transfer area runoff