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Final Internship Presentations.pptx

  2. Groundwater contamination occurs because of either; Man-made products like gasoline, oil, organic salts etc. Untreated waste like septic tanks, storage tanks etc. A&T Farm Situation Gasoline release in underground storage 10 years ago. AxNano pilot-tested remediation products on A&T farm Cleaning up is important to stop contamination influx into freshwater bodies around the farm consumed. 2 BACKGROUND STORY
  3. 3 Method for Clean-up Process In-Situ Chemical Oxidation • Involves the use of technology for remediation of contaminated area. • Used for treatment of chlorinated organic solvents and petroleum hydrocarbons. Can Be Done By; • Excavation • Injection How It Works • It uses chemical oxidants. • Oxidants are passed through permeable reactive barriers. Image credit: Siegrist, Robert L., Michelle Crimi, and Thomas J. Simpkin, eds. In situ chemical oxidation for groundwater remediation. Vol. 3. Springer Science & Business Media, 2011.
  4. 4 AxNano method of remediation In-situ method Deployment of canisters with sleeves (oxidant-packed sleeves) into site of contamination Shortcomings of this product Difficult to make Expensive materials Time consuming Deployment difficulty What AxNano needed from me as an intern How can this product be made better? Extended - release oxidation (XRO) product
  5. MY INTERNSHIP GOALS To design a product that; • Less expensive : evaluating product expense • Super-fast and easy to make: evaluating time of completion • Easily deployed: evaluating ease of use • Effective in remediating contaminants: evaluating water quality parameters like pH, ORP and conductivity. Hypothesis/Questions to be tested/answered with designed products; • Is cannister really needed? • Is the newly designed product easier to deployed? • Is the new design effective in remediation without cannister? - Does it release oxidants(percarbonate)? 5 Boundary Conditions To Note For: -Evaluation Oxidant Release • pH – 7 to 11 • ORP(mV) – 200 to 500 • Conductivity(mS/cm) - 0.6 to 6 -Cost • 50% cheaper than current product -Time to make • 5 to 10 minutes to assemble each product -Deployment • 10 to 20 minutes
  6. Current AxNano Product 6 Sleeves (for oxidant packing) Cannisters Electric wire Ferrules
  7. Product development Overview 3 products developed • Canisters with sleeves • Single sleeve • Split sleeves Design modification • Braided thread replaces the 2mm electric wire • Ferrules clipper avoided • Loops introduced for easy pull-up during sample collection. 7 Cannisters with sleeves Split sleeves Single sleeves
  8. Testing Product Efficiency Designed product was tested for; • Ease of deployment • Effectiveness -pH -Conductivity -ORP -Control-release Method of Testing -Lab test of (oxidant- packed) sleeves -Field test of (oxidant-packed) sleeves 8
  9. Oxidant (percarbonate) Properties • Odorless with white solid appearance • Strong oxidizing properties • Molar mass of 156.982 g/mol • Solubility density of 150g/l • Molecular formula Na2CO3·1.5 H2O2 Oxidizing Properties It reacts with water to liberate H2O2 Na2CO3●1.5H2O2 (s) → Na2CO3 (aq) + 1.5H2O2 (aq) H2O2 in groundwater remediation In the presence of Fe(ii) salts acting as catalyst, dilute hydrogen peroxide under mildly acidic conditions react to initiate a very powerful oxidation process. Fe2+ + H2O2 Fe3+ + OH- + OH● Percarbonate Image source: wikipedia 9
  10. AxNANO Laboratory Goal of this experiment; - To determine release rate of hydrogen peroxide in relation to what is to be expected from the A&T site - to determine pH, ORP, and conductivity of hydrogen peroxide in relation to what is to be expected from the A&T site What was done? • A batch reactor was set-up labelled A-F. • Equally measured percarbonate tablet was placed into beaker A-C. • Sleeves were cut up into three parts to imitate our product design. • Sleeves were packed with percarbonate and zip-tied and dropped into beaker D-F (this is to show how possible it is for percarbonate to diffuse through a barrier when inserted in groundwater). • Sample tests were done at different timepoints 10 PC TABLET PC IN SLEEVE PC TABLET PC TABLET PC IN SLEEVE PC IN SLEEVE
  11. 11 Take Away From Lab Results • There is increase in pH (becomes basic). • There is an increased conductivity value. • Increased oxidation-reduction potential. • Percarbonate powder in reactor D, E, and F was completely consumed after 1 week. • Observed controlled release of product. What does this mean for the designed products? • Product is expected to cause changes in pH, conductivity and oxidation-reduction potential.
  12. 12 Field Deployment of Designed Products on A&T Farm With lab-test background knowledge on how designed product is supposed to work, • 4 wells were chosen for product field-test. • Well 10, 8 , 6, and 14 were used. Initial Conditions of Wells • pH was acidic on all 4 wells • Low conductivity for all wells • Oxidation-reduction was low. Area view of A&T contaminated site
  13. 13 •Well 10 – control well.​ •Well 8 – Canisters plus sleeves.​ •Well 6 – Single sleeve​ •Well 14 – Split sleeves​ Control (no sleeves) Canisters with sleeves Single Sleeve Split Sleeves
  14. 14 Field deployment of designed products
  15. 15 • pH changes from acidic to basic in wells having deployed products. • There was a sizeable increase in conductivity ( over 300% increment). • Oxidation-reduction potential also increased ( over 300% increment). • All oxidants in single sleeve and split sleeves were completely consumed after 1 week, while oxidant in canisters plus sleeves was only 95% consumed after 1 week. RESULTS OF PRODUCT DEPLOYMENT
  19. 19 •Designed products were very easy to deployed.​ •Product was easy to make​ - saves time​ - conserve energy​ - doesn't require special technical skills​ •It was cost- effective designing these products because;​ -ferrules, cannisters, and electric wire was excluded in new design. Boundaries Condition/Values Result Control Release Yes Yes No ORP(mV) Within 200-500 Yes Yes No Conductivity(mS/c m). Within 0.6 - 6 Yes Yes No pH 7-11 Yes Yes No Cost; 50% cheaper than current product Yes Yes No Time to set- up(min) 5-10 Yes Yes No Easily Deployed (10-20) mins Yes Yes No
  20. 20 CONCLUSIONS • Experimental results from laboratory experiment shows that percarbonate deployed in single sleeve and split sleeves undergoes controlled release. • Designed products allowed release of percarbonate in water to cause a positive change in pH, ORP and conductivity. • Single sleeve and split sleeves in well 6 and 14 respectively, were as effective as the canister plus sleeves deployed in well 8. • Due to invented product design (braided ropes, no canisters, and invented loops) for the A & T experiment, samples for WM8 and WM6 were deployed easily and removed with ease for sample collection (becomes more lighter during pull-up).
  21. WHAT I THINK • While it is noteworthy that all products deployed were efficient, split sleeves is not advisable. They easily get tangled during removal for sample collection, and it consumes time in untangling these ropes. • Based on tests and observation, I believe the single sleeve deployment method was the best. It doesn't get tangled, oxidants were completely consumed, and it doesn’t require canisters. • This design was done on a pilot-scale, design could change or be modified for a larger scale testing. • While single sleeve is the best based on this pilot scale testing, its protection from tear and wear cannot be guaranteed. Canister plus sleeves might still be better in such scenarios. 21
  22. 22 RECOMMENDATIONS • Samples collection after insertion should be done in consideration to the product size, so as to get a clear insight on how fast percarbonate is decimated. For this product, effects of treatment were noticeable in the results after 1 week of insertion. • Braided ropes can be subjected to lab test to further ascertain its durability. • Tests need to be replicated on a larger scale to account for reproducibility.
  23. INTERNSHIP EXPERIENCE AND LEARNINGS Goals set at the beginning of internship • Learn new laboratory skills • Expand Professional Network • How to work as a part of a team 23
  24. Laboratory Skill Gained • I gained super helpful skills like -writing and editing SOPs -following SOPs -batch reactor set-up -pipetting • I know mechanism behind some oxidants reaction by performing experiments on -water quality -percarbonate/hydrogen peroxide assay -persulfate assay • Mastered the use of lab equipment such as pH, conductivity, and ORP meter. 24
  25. Expand Professional Network Working at AxNano has opened the opportunity to know; The CEO, Doug Speight – was able to learn how business can be integrated into research. The Chief Scientist, Alexis Carpenter- learned how to assigned and monitor tasks. The research manager, Julia Darcy- was very helpful in helping me developed my research skills and answering most of my questions. The research assistant, Laura Grace- super helpful with the batch reactor experiment. I was able to integrate easily. The assistant scientist, Ryan Rains – Learned a lot of life saving skills from him. His skills were super helpful on the field. I knew more coffee shops through him. 25
  26. How To Be A Team Member Over five months at AxNano has taught me that working as part of a team is necessary for personal development as well as professional development. What I learned • Working as a team improve team bonding, case study, the Monday team bonding meeting spear-headed by Laura Grace. • Works get completed faster and efficiently. -working on algae bloom with Julia and the team. 26
  27. ACKNOWLEDGEMENT Special thanks to all staffs of AxNano for the opportunity afforded me to do my internship in this organization. Special thanks to the CEO,Doug Speight, and my supervisor, Alexis Carpenter for providing an enabling environment to set and achieve my internship goals. Special thanks to Julia and Laura for the patience in answering my questions, and the support provided during my lab operations. Special thanks to Ryan for taking that weekly trip with me to collect data. I appreciate you. And lastly, special thanks to my advisor, Dr. Herr, for the understanding, and the advice. God bless you all. 27