PHYSICAL/CHEMICAL TREATMENT FOR REFINERY WASTEWATER
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Transcript of PHYSICAL/CHEMICAL TREATMENT FOR REFINERY WASTEWATER
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• Biological IWWTP & GAC Columns
• PACT WWTP
• MBR & GAC Columns
• PAC MBR (Carbon Enhanced MBR)
• GAC MBR
High Temp (> 50 C) – Bio Difficult
High Chlorides (->1,000 mg/L )
V. High TDS (5,000 + mg/L)
V. High Feed Conc. Changes
High Ammonia/Phenol Concentrations
Frequent Flow interruptions
Refractory Organics
Conventional WWTP – Not Feasible
Carbon Adsorption Required
Conventional IWWTP & GAC Columns
PACT IWWTP
MBR & GAC Columns
PAC MBR (Carbon Enhanced)
GAC MBR – EcoRight MBR
To Effluent
Lagoons
Storm
Water
Basin
Walnut
Shell
Filters Activated
Sludge with
DAF???
Refinery Stormwater,
Process Wastewater,
Oil to Slop
Oil System
Chiller Polymer
Methanol &
pH Control
Biosludge
Thickening Dewatered Biosludge
to Disposal
Sanitary
Wastewater
API
Separators
EQ
Tanks
GAC M
Phosphate
Chlorination
• Most common system
• Biomass unstable – feed fluctuations = upsets
• Solids won’t settle in Clarifier
• Can’t meet effluent requirements w/o GAC
• Ammonia may be toxic
• Extensive plot area required to accommodate equipment – Space Limitations
MBR
Marine
Discharge
WW from
Primary
Treatment
GAC
Columns
• No Clarifier = No Settling Problems • Smaller Footprint
• More Stable Biomass
• Membrane Fouling • High Cost for GAC Replacement / Regeneration
WW from
Primary
Treatment
PAC
MBR
Marine
Discharge
~400 mg/L (~4 mg/L)
99%
(~5 mg/L)
99%
~750 mg/L (151 mg/L)
81%
(46 mg/l)
92%
~200 mg/L (27 mg/L)
86%
(11 mg/L)
94%
1.1 mg/L <0.2 mg/L
0.43 NTU <0.18 NTU
238 mg/L 27 mg/L
• No Clarifier = No Settling Problems
• Smaller Footprint
• More Stable Biomass
• Lower Cost for Carbon
• No Fouling
• Reuse Possible
• Membrane Abrasion
0
100
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700
800
900
1000
PreGAC GAC Acclimation Acclimated
0
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Feed
Residual %
Ae
rob
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Ta
nk
An
ox
ic
Ta
nk
Control Panel M
OS
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50
100
150
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Feed
Effluent
BOD (mg/L)
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900
Feed
Effluent
Chemical Oxygen Demand (mg/L)
• Very Tolerant of Upsets • High Removal Efficiencies Possible • Allows Reuse – RO Not Affected by Discharge
• GAC Regeneration – Equilibrium Established • Suspension Patents Effective • GAC Not Damaged by Aeration • System Not Sensitive to High [Oil] • Nitrification Temperature Sensitive – Cooling Req’d • GAC Lasts > 6 Months • COD Analytical Problems – Chlorides / Carbonates??
• Small footprint
• High COD, TOC, and TSS removal efficiency
• Bio-refractory organics removal
• No gravity clarification
• More stable – Less upsets
• Wastewater reuse potential
• Lower capital, operating & maintenance costs
• Lower abrasion rate
• Less carbon use and less sludge
CONVENTIONAL ACTIVATED SLUDGE PROCESS
Biological
Reactor
Reclaimed
WW for
Reuse
Clarifier
(Gravity) Tertiary
Filter Carbon
Filter
WW from
Primary
Treatment
CONVENTIONAL MEMBRANE BIOREACTOR PROCESS
MBR Reclaimed
WW for
Reuse
WW from
Primary
Treatment
Carbon
Filter
GAC MEMBRANE BIOREACTOR PROCESS
GAC
MBR
Reclaimed
WW for
Reuse
WW from
Primary
Treatment
