Aerobic Cometabolism RE3 Conference, Philadelphia, PA Presented by - - PowerPoint PPT Presentation

Aerobic Cometabolism RE3 Conference, Philadelphia, PA

Presented by Brent O’Dell & David Side 15-17 September 2015

Agenda

Introductions

• Brent O’Dell, PE, Amec E&I

Hamilton, NJ – Technical Manager

• David Side, AMEC E&I

Mid-Atlantic, NJ – Senior Geologist

Outline

• Project Overview
• Lessons Learned
• Questions and Answers

2

Background

• Industrial facility in operation for over 80 years
• Manufacturing of color bases, pigments, and resins
• Compounds identified in the shallow fractured bedrock :



Trichloroethene (TCE)



Perchloroethene (PCE)



Cis-1,2-dichloroethene (cis-1,2 DCE)



1,2-dichloroethane (1,2-DCA)



Chlorobenzene



Chloroform

• Groundwater impacted
• NJ’s Industrial Site Recovery Act (ISRA)

3

Geology

Site location: the Newark Basin in New Jersey Overburden: Approximately 5 to10 feet of anthropogenic fill Residual soil Highly weathered bedrock Underlying the overburden: Mudstone facies of the Passaic Formation Strikes at approximately N 70 degrees E and dips 10 degrees to the NW

4

Site Location

Hydrogeology

Fractured bedrock beneath the Site:

• Multi-unit groundwater system
• Groundwater flows in larger aperture bedding plane fractures
• Cross cutting joints and other extensional fractures

Groundwater systems beneath the Site:

• Shallow fractured bedrock (up to 80 feet) - Intermediate Unit
• Deeper fractured bedrock (80 to 130 feet) - Deep Unit

Intermediate Unit: yields of approximately 1 gpm or less Deep Unit bedrock zone: yields of 7 to 15 gpm

5

Area of aerobic cometabolism treatment

6

Shallow and Intermediate Contours Aerial View

The General Approach

• Microorganisms naturally occur in the

groundwater:

 Add a hydrocarbon (e.g., propane)  Organisms oxidize it for their energy needs

• Microorganisms produce enzymes that degrade

the chloroethenes and chloroethanes

• Continual / effective delivery of the hydrocarbon

= oxygen supporting the enzyme activity

7

Aerobic Cometabolism Diagram

8

Gas Infusion Technology

9

iSOCTM gas infusion technology: A mass transfer technology developed by InVentures Technologies, Inc. Capable of delivering long term, high concentrations of dissolved gases

Microporous Hollow Fibre

Cross Section 200 µm Inner Surface 1 µm

ISOC

Gas Type Water Column depth (ft)

5' 10' 15' 20' 50' Oxygen 42 55 62 69 111 Methane 22 30 33 37 59 Propane 66 88 99 110 175 Hydrogen 2 2 3 3 5 Ethane 57 75 85 95 150

Dissolved gas concentrations in a water column

Pilot Test

10

The aerobic cometabolism system:

• Cylinders of industrial grade oxygen and propane (housed separately

in portable garden sheds)

• Two-stage regulators to control the line pressure in the gas tubing

and iSOCTM units SW-5 and SW-20: monitoring wells

SW-20 SW-13 IW-3 SW-5 IW-2

Timeline

11

Initiated cometabolic pilot test O2 and nitrogen/ propane mixture alternated in each well Field testing indicated nitrogen/propane infusion suppressed the O2 infusion System optimization 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 Continued decreases - maintenance

• f low concentrations

Evaluation of Results of SW-13

• 200

200 400 600 800 1000 Jan-93 Oct-95 Jul-98 Apr-01 Jan-04 Oct-06 Jul-09 Apr-12 Dec-14

Concentration (ug/L) Date

1,2-Dichloroethane (pre pilot study) 1,2-Dichloroethane (post pilot study)

12

Evaluation of Results of SW-13

• 20

20 40 60 80 100 120 140 Jan-93 Jul-98 Jan-04 Jul-09 Dec-14

Concentration (ug/L) Date

Chlorobenzene (pre pilot study) Chlorobenzene (post pilot study)

13

Evaluation of Results of SW-20

5 10 15 20 25 30 35 40 45 Jan-93 Jul-98 Jan-04 Jul-09 Dec-14

Concentration (ug/L) Date

1,2-Dichloroethane (pre pilot study) 1,2-Dichloroethane (post pilot study)

14

Evaluation of Results of SW-20

2 4 6 8 10 12 14 Jan-93 Jul-98 Jan-04 Jul-09 Dec-14

Concentration (ug/L) Date

Chlorobenzene (pre pilot study) Chlorobenzene (post pilot study)

15

Results

• DO measurements in SW-5, SW-13, and SW-20 generally

indicate enrichment and availability of DO and its distribution away from the infusion wells toward these wells

• ORP measurements in SW-5, SW-13, and SW-20 have

generally been positive and indicative of aerobic enzymatic reactions

• DAP successfully supplies depleted nutrients
• HPC measurements indicate a well developed population
• f microorganisms

16

Conclusions

Bioenhancement optimized by:

• The infusion of pure propane
• The rotation of propane and oxygen infusion
• The periodic infusion of propane-only and oxygen-only
• The addition of DAP

Aerobic metabolism/cometabolism and reductive dechlorination processes:

• Bioenhanced the shallow fractured bedrock groundwater system
• Reduced COCs, allowed approval of MNA and monitoring
• Successfully established closure for groundwater

17

Questions

18

Answers