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CARBON ENHANCED MBRs

William Conner P.E., DEE

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Outline

Oily WW Treatment Challenges

Treatment OptionsBiological IWWTP & GAC Columns

PACT WWTP

MBR & GAC Columns

PAC MBR (Carbon Enhanced MBR)

Conclusion / Summary

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Problem

Refinery / Oil Processing Wastewater

High Temp (> 50 C)Bio Difficult

High Chlorides (->1,000 mg/L )

V. High TDS Variability

High Ammonia/Phenol ConcentrationsFrequent Flow interruptions

Refractory Organics

High Maintenance Sensitivity Water Conservation Important

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Main Concern

- Refractory Organics -

Conventional WWTPNot FeasibleCarbon Adsorption Required

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Treatment Options

Oil/Water Sep. & Conventional IWWTP

Conventional IWWTP & GAC Columns

PACT IWWTP

Oil/Water Separation & MBR

MBR & GAC Columns

PAC MBR (Carbon Enhanced)

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Conventional Biological Treatment& GAC Columns

To Effluent

Lagoons

StormWater

Basin

WalnutShell

FiltersActivated

Sludge with

DAF???

Refinery Stormwater,

Process Wastewater,

Oil to Slop

Oil System

ChillerPolymer

Methanol &

pH Control

Biosludge

ThickeningDewatered Biosludge

to Disposal

SanitaryWastewater

API

Separators

EQ

Tanks

GACM

Phosphate

Chlorination

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PACT Biological Treatment

WalnutShell

FiltersPACT

Activated

Sludge withDAF???

Refinery Stormwater,

Process Wastewater,

To Effluent

Lagoons

Oil to Slop

Oil System

ChillerPolymer

Methanol &

pH Control

Biosludge

ThickeningDewatered Biosludge

to Disposal

SanitaryWastewater

API

Separators

EQ

Tanks

M

Phosphate

Chlorination

StormWater

Basin

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Conventional Biological TreatmentAdvantages / Disadvantages

Advantages Most common system

Disadvantages Biomass unstablefeed fluctuations = upsets

Solids wont settle in Clarifier Cant meet effluent requirements w/o GAC Ammonia may be toxic Extensive plot area required to accommodate

equipmentSpace Limitations

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MBR & GAC Process Design

WW fromPrimary

Treatment

MBR

Marine Discharge

GAC

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MBR & GACAdvantages / Disadvantages

Advantages No Clarifier = No Settling Problems Smaller Footprint More Stable Biomass

Disadvantages Membrane Fouling High Cost for GAC

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PAC MBR Process Design

PAC MBR

Marine DischargeMarine Discharge

WW fromPrimary

Treatment

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PAC MBR (Carbon Enhanced)Advantages / Disadvantages

Advantages No Clarifier = No Settling Problems Smaller Footprint More Stable Biomass Lower Cost for Carbon No Fouling Reuse Possible

Disadvantages Membrane Abrasion

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PAC MBR COD Removal

Refinery WW - COD Removal

PAC PetroMBR

0

200

400

600

800

1000

1200

1400

11/19/2006 12/9/2006 12/29/2006 1/18/2007 2/7/2007 2/27/2007 3/19/2007

Date

COD,mg/L

Feed COD Effluent COD

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MBR & PAC MBR Comparison

Feed MBR

Removal %

PAC MBR

Removal %

BOD ~400 mg/L (~4 mg/L)

99%

(~5 mg/L)

99%

COD ~750 mg/L (151 mg/L)81%

(46 mg/l)92%

TOC ~200 mg/L (27 mg/L)86%

(11 mg/L)94%

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Effluent Comparison

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Membrane Comparison

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MBRPAC MBR RO Comparison

MBR PAC MBR

Silica - Total 1.1 mg/L

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MBR & GAC vs. PAC MBR

MBR & GAC PAC MBR

High Op. Cost for GAC Lower Op. Cost

Higher Capital Cost Lower Capital Cost

Slow Acclimation Immediate Acclimation

Susceptible to Upsets Tolerant to Upsets

Frequent Cleaning Less Frequent Cleaning

Poor Refractory Removal Ex. Refractory Removal

Slow Drying Sludge Better Dewatering Sludge

Effluent Fouled RO RO Acceptable Effluent

Long Term Fouling?? Long Term Abrasion??

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Summary

Conventional IWWP

Not Stable MBR & GAC Columns

Stable Operation

Fouling Problems PAC MBR

Stable Operation

No Fouling ProblemsEconomicalLower Cap & Op. Expenses

Abrasion

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Thank You