Remediation Solution Design
King's Landing Contamination Clean-up
Project 3
Company: Rubbish Raccoons
SDSU
San Diego State
University
Engineering Firm 6
ENV E 558: Solid and Hazardous Waste Engineering
Spring 2024 Team Contributions
Section of the Report
Team Members Contribution
Cover Page
Introduction & Background
Appropriate Remediation Option
In-Situ Remediation
Ex-Situ Remediation
Conclusion
All
Appendices
All
2 Table of Contents
Introduction & Background........
Appropriate Remediation Options .......
In-Situ Remediation….....
Ex-Situ Remediation.…….......
Conclusions......
Appendices
3
4
4
4
5
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.6 4
Introduction & Background
• Describe the current conditions, and the other pertinent information given in the design
problem (Table 1 and 2).
• The last sentence of the section should be the objective statement (i.e., “The objective of this
report is to...")
The Rubbish Raccoons have been contracted by the city of Kings Landing to devise an
In-Site and Ex-Site remediation plan. This remediation plan is focused on the contaminate,
Appropriate Remediation Options
Use the contaminant characteristics (see Table 2) to:
•
Make a prediction about how the contaminant might be transported in the environment (i.e., by
air, by water, by soil, etc.) and explain why.
• Describe which remediation methods we discussed in class could be appropriate for
remediation of the contaminant. Explain why the remediation methods are appropriate or not
appropriate for this contaminant.
In-Situ Remediation
Reductive dechlorination with zero valent iron (ZVI; Fe°) will be used as the in-situ remediation
technique to treat the Chlormonium plume at Kings Landing by excavating a trench downstream
of the contaminated plume and filling it with ZVI. According to Calculation 1 in Appendix 2,
55.94 kg C10HCl, is present in the contaminated plume and needs to be treated. According to
Calculation 2, this will require 83.78 kg Feº, which will cost $38,958.96.
10
Chlormonium (C₁0HCl) reduces to relatively non-toxic ethylene, C2H4 and harmless chloride
ions, Cl. However, ethene is a flammable gas and useful compound, so vents will be installed in
the trench, and the ethene will be captured in tanks from the venting pipes at ground level.
ZVI is being chosen as the reducing agent due to its moderate reductive capacity, as each half
reaction yields 2 electrons per mole of Feº as demonstrated in Reaction 1d in Appendix 1. ZVI is
generally a good reductant choice because it “is non-toxic, abundant, cheap, easy to produce, and
its reduction process requires little maintenance” (Fu et al., 2014). Nano ZVI (nZVI) is the
preferable form of ZVI as the nanoparticles provide more surface area for reactions to occur. 5
Ex-Situ Remediation
Consider pump-and-treat ex-situ oxidation using potassium permanganate (KMnO4) as the
oxidant. This option will install a pump in the center of each plume and pump the liquid out of
the ground into a tank where it can be treated with KMnO4, followed by discharge of the treated
water into an infiltration basin. Calculate the cost of the stoichiometrically-required KMnO4, and
the cost of the pumping, considering the following:
•
Oxidant (KMnO4) costs $60 per kg and has a molecular weight of 158 g/mol.
• Assume complete oxidation, where all carbons are converted to CO2 and chlorine molecules
are converted to Cl-; permanganate forms MnO2 oxide.
• Pumping costs (dollars), Cost ($) = 15,715*Q, where Q is the pumping rate in m3/d.
• Use the maximum pumping rate that can be used without causing a drawdown of more than
15% of the initial aquifer height.
• The aquifer has a hydraulic conductivity of 0.60 m/d.
•
The well radius is 0.3 m and the well's radius of influence is 500 m.
• Relevant half-reaction: MnO4- + 4H+ + 3e- → MnO2 + 2H2O
Conclusions
Summarize the key findings and recommendations.
References
https://www.sciencedirect.com/science/article/pii/S0304389413009941?casa_token=TB28TWa8
wdkAAAAA:fWXfLEwINHmp_435uoxN6ZtyPdwrV2fGsFaeQIY4bVAVbI7r0IsshK-ZpXdGqL
X0Nk620S7XCg#sec0005/n4. EX-SITU REMEDIATION
Consider pump-and-treat ex-situ oxidation using potassium permanganate (KMnO4)
as the oxidant. This option will install a pump in the center of each plume and pump
the liquid out of the ground into a tank where it can be treated with KMnO4, followed
by discharge of the treated water into an infiltration basin. Calculate the cost of the
stoichiometrically-required KMnO4, and the cost of the pumping, considering the
following:
•
Oxidant (KMnO4) costs $60 per kg and has a molecular weight of 158 g/mol.
• Assume complete oxidation, where all carbons are converted to CO2 and chlorine
molecules are converted to CI; permanganate forms MnO2 oxide.
•
•
•
•
•
Pumping costs (dollars), Cost ($) = 15,715 *Q, where Q is the pumping rate in m³/d.
Use the maximum pumping rate that can be used without causing a drawdown of
more than 15% of the initial aquifer height.
The aquifer has a hydraulic conductivity of 0.60 m/d.
The well radius is 0.3 m and the well's radius of influence is 500 m.
Relevant half-reaction: MnO4 + 4H+ + 3eMnO2 + 2H2O
