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 .5 .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

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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 A