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Sustainable Environmental Development through Wastewater Management at KNPC Health, Safety & Environment Department Environment Division

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  • Sustainable EnvironmentalDevelopment through

    Wastewater Management at KNPC

    Health, Safety & Environment DepartmentEnvironment Division

  • (.82/){ }:

  • World Water Day 2013

    KUWAIT NATIONAL PETROLEUM COMPANY

    MAIN BUSINESS UNITS

  • Wastewater:

  • Wastewater Generation From KNPC Facilities

    1900 GPM

    MAA MAB

    1144 GPM

    SHU

    1020 GPM

    4066 GPM

    2 GPM

    LM

  • Legal & other Requirements Kuwait EPA Articles:

    Article 59Liquid Effluent discharge into themarine environment should notexceed levels listed * Article 60Industrial liquid discharge intopublic drains should not exceedlimits . Article 61Treated liquid wastewater mustnot exceed limits .

    KPC Corporate HSE Standard Management of WastewaterDischarge (Document 14) shall also be applicable and adhered to.

    FINAL TREATED WATER ALLOWABLE LIMIT BY K-EPA

    pH 6 - 8

    TemperatureT Water must not exceed 10 Co

    Oil & Grease 10 mg/L

    Ammonia, (NH3) 3.0 mg/L

    Sulfide 0.5 mg/L

    Phenol 1 mg/L

    Total Suspended Solid(TSS)

    10 mg/L

    Chemical Oxygen Demand(COD)

    200 mg/L

    Biochemical OxygenDemand (BOD5)

    30 mg/L

  • World Water Day 2013

    KNPC Strategy For Water Conservation

  • Sea water Coolers

    MixBed

    KNPC

    Boiler

    Stream Turbine

    WastewaterTreatment Plant

    Sea Water Suction

    Recovered Condensate

    Steam

    Demineralizedwater

    BFW

    Sea WaterPumps

    Fire Water

    De-Aerator

    Refinery Plants

    Sewer Drainswastewater

    Evaporator

    Sea Water Discharge

    Desalinatedwater

    RO plant

    World Water Day 2013

  • Various Conservation Schemes Well laid draining procedures. Closed sampling loops. Maximum recovery of Slop. Spent caustic reuse for alkalinity makeup. Maximum reuse of Stripped Sour water. Reuse of treated effluent

    Cooling tower makeup. Irrigation. Oil well pressure boosting.

    Maximum condensate recovery. Metering of Utility water consumption.

  • KNPC World Water Day 2013

    Conservation of Steam

    Effective chemicalTreatment program toReduce Blow down.

    Effective Inspection.

    Optimization of steamto reduce steamVenting .

    Effective preventiveMaintenance .

  • Water Recycle in Refineries

    KNPC World Water Day 2013

    Steam

    Steam trapsSurface condensersRe-boilersCoolers

    SteamCondensate

    SourW

    ater

    Over Head ReceiversSeparatorK.O drums

    SWT Stripper

    Refinery

  • U-56

    Effluent water fromCPI separator

    CPI-101/102/103/104

    Effluents fromSHU Refinery

    Spent caustic fromMerox Units-

    22& 21, TK-201Chemical sewers

    Stripper sour water

    DAF FEEDTANK -113 Cooler

    950 F

    Sand filter &Post Aeration

    Centrifuge

    Dewatered Bio sludge to NCC

    Treated waterto MixingBasin

    Clarifier

    DAF EqualizationTank

    CL-101 A/B/C/D/E

    1000-1500 gpm

    1000-1500 gpm

    1-2 gpm

    Aeration

    Preaeration

    ChemicalDosing

    Biotreater

    To Sea

    Bio massRecirculation

    SurplusBio mass

    200-400 gpm

    Bio mass +Water

    Water

    Spent Caustic Equalization

    o

    o

    o

    o

    Offspec Holding & processing

    o

  • pH : 8.0Oil :

  • RETF-MAB Biological Treatment Preaeration:

    Purpose Biological oxidation of Sulfides (up to

  • RETF-Important Features Maximum possible level of Automation with Online

    analyzers, Local and remote DCS Control. Two train design for redundancy Adequate equalization with inline mixer Adequate off-spec holdup capacity All tank breathing vents fitted with Activated carbon

    filter. Biological process vent air treated by scrubber. Biological treatment process implementation in two

    steps-Preaeration and Aeration. This leads to very stableoperation, very good microbiological health andsettleability with plenty of rotifers. Also excess sludgeproduction is minimum (about 100 gm /kg of COD input).

  • FINAL EFFLUENT QUALITYParameters

    MAB

    Design Actual

    Flow 2976-4357 USGPM 2400 USGPM

    pH 7-8 7.0-7.5

    Oil & Gr (ppm)

  • MAB&SHU-Positive ImpactContaminant Effluent quality

    before RETFProject

    Effluentquality postRETF Project(Design)

    Positive Impactas per design

    ppm ppm Reduction

    Oil 50 80%

    TSS 28 64.3%

    COD 419 52.2%

    Sulfide 13 96.2%

    TKN 12 58.4%

    Phenol 06 83.6%

  • KNPC

    Sampling by External agency

    Sampling by KNPC Lab

    Wastewater Management Team

    CCTV monitoring

    World Water Day 2013

  • Further Challenges Disposal of Biological Sludge :

    Exploring better options than landfill e.g. Incinerate/use for bioremediation of contaminated soil/ soilreclamation etc.

    Off-spec waste management: Occasionally very strong COD/TKN/Sulfide bearing

    wastewater streams get generated (e.g. Chemicaldecontamination) or sometimes the abnormality (leaketc.) leading to off-spec wastewater productioncontinues for more than expected /design time.

    Online analyzers for Ammonia and Sulfide These analyzers based on Ion selective electrode

    method are not found reliable.


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