Biodegradation of MtBE Using an Innovative Biomass ... · Albert D. Venosa Cincinnati, OH 45268...
Transcript of Biodegradation of MtBE Using an Innovative Biomass ... · Albert D. Venosa Cincinnati, OH 45268...
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Biodegradation of MtBE Using an Innovative Biomass Concentrator Reactor
U.S. EPA National Risk Management Research Laboratory
University of Cincinnati Department of Civil and Environmental Engineering
Albert D. Venosa
Cincinnati, OH 45268
Maher Zein and Makram T. Suidan
Cincinnati, OH 45221
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MtBE as Fuel Additive
z First used in U.S. as an octane enhancer in 1979 z
reformulated gasoline programs and implemented them in 1992 and 1994 to reduce CO and O3 in high pollution areas �
add oxygenates to gasoline for more efficient combustion
� oxygenate, 15% use ethanol
z Sources in the environment � Refineries where it is produced � LUSTs
In 1990, EPA initiated the oxyfuel and
To meet oxyfuel requirements, producers
80% of all oxyfuels use MtBE as the
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Methyl t-Butyl Ether (MtBE)
(CH3)3COCH3
z Highly Water Soluble (>48 g/L) z Low octanol-water partition coefficient (Kow) � Contaminates groundwater, migrates in
aqueous plume z Low taste and order thresholds z Possible Health Effects � U.S. EPA DW Advisory: 20-40 µg/L � California DHS DW Advisory: 5 µg/L � 23 states have regulatory guidelines or
standards ranging from 12 (WI) to 240 (MI) µg/L
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MTBE Biodegradation
z Initially reported to resist biodegradation z Yield coefficient very low (Y = 0.10) � 0.10 mg biomass produced per mg MTBE
consumed � Explains why initial literature reported
resistance to biodegradation z Challenging for reactor design due to low yield
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Normal Activated Sludge System
z Typically: Yobs = 0.5 mg/mg, BOD5 = 220 mg/L
Return Activated Sludge
Bioreactor Settling Tank
Waste
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Challenges of Low Yield
z
(at wellhead) z 1.0 mg MtBE/L * 0.10 mg biomass/mg MtBE
= 0.10 mg biomass/L z Thus, large fraction of biomass leaves
system via effluent z To get effective treatment to low MCLs, must
Groundwater typically 0.5 – 1.0 mg/L MtBE
retain ALL biomass
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z Municipal & Industrial Wastewater Treatment � Better solids separation to attain desired
effluent quality � Solids wasting under complete control of
operator
z Surface & Groundwater Treatment � Ideally suited for dilute streams � Ideally suited for soluble pollutants � Biomass retention
Applications of Biomembrane Technology
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Biomass Concentrator Reactor (BCR)
z MBR: very effective at retaining all biomass � Operational costs high due to requirements
for pressure or vacuum to drive solid/liquidseparation
z Design of BCR Based on Lab-Scale Porous-Pot � Designed to tolerate high flow due to higher
surface area z Cost Effective Alternative to MBR � Relies on gravity separation � Simple operating system � Low maintenance requirement
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AS/GAC System
Contaminated groundwater
InfluentEffluent
N/P
Air Blower
AS/GAC System
Contaminated groundwater
InfluentEffluent
N/PN/P
Air Blower
Schematic of the BCR
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River
Flow Regime at Pascoag, RI
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Membrane module being taken out for regeneration
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Experimental Approach
z Culture preparation � Biomass grown in 55-gal drums for a year on
MtBE and BTEX � Prior to traveling to Pascoag, biomass was
settled and transferred to 1 drum, connected to an aerator, and transported by van
z BCR preparation � All plumbing and electrical connections
completed prior to arrival � Plan was to start flow at 1 gpm, then gradually
increase it to the final flow of 5 gpm within a month
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Analytical z
� Cincinnati for analysis
�
� Compounds measured included: �
� MtBE (methyl-t-butyl ether) � tBA (t-butyl alcohol) � tBF (t-butyl formate) �
�
� DIPE (diisopropyl ether) � Acetone � Methanol � Ethanol
Samples collected 3 times daily for 6.5 months (morning, noon, late afternoon)
Samples preserved at high pH, iced, and shipped to
Samples analyzed by GC/FID using heated purge and trap
BTEX (benzene, toluene, ethylbenzene, xylenes)
tAA (t-amyl alcohol) tAME (t-amyl methyl ether)
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Other Measurements
z Daily monitoring of temperature, pH, DO z Samples of reactor contents collected weekly for: � TSS � VSS � NPOC
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Membrane Regeneration
z Membranes were regenerated as part of a planned schedule whether they needed it or not � Removed one at a time, soaked in a stainless
steel dip tank containing chlorine bleach for 4 hours, then soaked in dilute nitric acid for another 4 hours, rinsed, and placed back into reactor
� Membranes were cleaned once in the 6-month period
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Experimental Results
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7/27
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/03
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time
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10 -1
10 0
10 1
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0
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5 µg/L
20 µg/LMtBEin
tBAin
MtBEeff
tBAeff
gpmconc
entr
atio
n, µ
g/L
flow, gpm
MtBE and tBA
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time
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10 -1
10 0
10 1
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10 3
10 4
tAMEinf
DIPEinf
tAAinf
tBFinf
tAMEeff
DIPEeff
tAAeff
tBFeff
conc
entr
atio
n, µ
g/L
Other Oxygenates
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10 0
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10 5
conc
entr
atio
n, µ
g/L Acetoneinf
MeOHinf
EtOHinf
Acetoneeff
MeOHeff
EtOHeff
Alcohols and Acetone
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10 1
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Con
cent
ratio
n, µ
g/L
Benzinf
Tolinf
E-benzinf
Benzeff
Toleff
E-Benzeff
Benzene, Toluene, Ethylbenzene
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time
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10 1
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Con
cent
ratio
n, µ
g/L
o-Xylinf
m-Xylinf
p-Xylinf
o-Xyleff
m-Xyleff
p-Xyleff
o-, m-, p-Xylenes
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date
0
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Con
cent
ratio
n, m
g/L
0
1
2
3
4
5
6
Flow
, gpm
TSS
VSS
gpm
Pascoag Reactor Solids
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/4/0
3 11
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6/03
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0/03
1/
6/04
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4 1/
27/0
4 2/
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2/
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4 2/
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4
time
0123456789
Con
cent
ratio
n, m
g/L
Inf NPOC
Eff NPOC
Non-Purgeable Organic Carbon
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Economic Comparison of BCR, MBR, and Air Stripping
z Assumptions: � 2 mg/L MtBE influent � 5 mg/L MtBE effluent � 3 groundwater flow rates (0.1, 0.3, and 1.0 mgd) � Air stripping equipped with GAC off-gas
treatment
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Economic Evaluation of Ex-Situ Reactors
0.550.540.411.0 mgd
0.820.930.880.3 mgd
1.051.762.110.1 mgd
BCRMBRStrippingFlow
Cost of ex-situ treatments, $/1000 gal*
*Estimates by Richard Scharp, EPA-NRMRL
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Summary and Conclusions
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Summary
z Despite substantial flow control problems during the first 3.5 months of operation, all contaminants were reduced to less than the desired 5 µg/L � UCL95 for final 4 months = 6.1 µg/L � UCL95 for final 2 months = 2.6 µg/L
z All VOCs were substantially degraded to near detection limits, including all oxygenates and hydrocarbons
z Final effluent was nearly drinking water quality as determined by NPOC levels attained
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Conclusions z Ex-situ pump-and-treat using BCR technology is a
z MtBE is fully biodegradable to CO2 and H2O under aerobic conditions �
amenable to ex-situ pump-and-treat
z License agreement with environmental remediationfirm in Cincinnati (Tipton Environmental) � Will be able to manufacture reactors very
inexpensively, thereby reducing estimated costssubstantially
z O&M costs still uncertain
z
technologically and economically viable treatment strategy for contaminated groundwater
Due to its high water solubility, MtBE especially
Maximum flow potential still unknown