Sustainable EnvironmentalDevelopment through
Wastewater Management at KNPC
Health, Safety & Environment DepartmentEnvironment Division
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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
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.