P18461: Solar Powered UV Water Purification
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Customer Handoff & Final Project Documentation

Table of Contents

Team Vision for Final Demo and Handoff

Summarize:

Budget Increase Request

Gantt Chart

Test Results Summary

Microbiological Testing

Results of Microbiological Testing. Shown in A-D are the plaques resulting from serial dilution plating of T7 in order Control, 3s treatment, 13s treatment, and 19s treatment, respectively. The blue circle at the bottom of the figure shows the dilution plating scheme for the experiment --- the number in the red circles indications the dilution of the sample plated in that location (i.e. 3 means a 10^-3 dilution). Plots on the right show the resulting PFU/ml at the tested conditions, and the log reductions of each condition from the control (19 seconds is not shown because there was no presence of T7 post treatment as is shown D the, single dot is likely from contamination).

Results of Microbiological Testing. Shown in A-D are the plaques resulting from serial dilution plating of T7 in order Control, 3s treatment, 13s treatment, and 19s treatment, respectively. The blue circle at the bottom of the figure shows the dilution plating scheme for the experiment --- the number in the red circles indications the dilution of the sample plated in that location (i.e. 3 means a 10^-3 dilution). Plots on the right show the resulting PFU/ml at the tested conditions, and the log reductions of each condition from the control (19 seconds is not shown because there was no presence of T7 post treatment as is shown D the, single dot is likely from contamination).

Log Inactivation of T7 in response to multiple wavelengths of light, as indicated in the legend of the graph [''Beck, Sara E., et al.

Log Inactivation of T7 in response to multiple wavelengths of light, as indicated in the legend of the graph [''Beck, Sara E., et al. "Action spectra for validation of pathogen disinfection in medium-pressure ultraviolet (UV) systems." water research 70 (2015): 27-37.'']. Our bulb is graded for 253.7 nm wavelength.

The results of the Ultraviolet testing are shown in the top figure above. The purpose of this experiment was to validate our model’s prediction of UV dosage rate by dosing T7 with our predicted dosage and using the log inactivation curve of T7 to back out the dosage that T7 actually saw. We intended to dose T7 with 5 and 10 mJ/cm^2, but we accidentally dosed T7 with 5 and 40 mJ/cm^2 (about 3 and 13 second treatments), however the results in the top figure above still validate our model. With a 3 second treatment from our UV reactor we were expecting to irradiate the surrounding bulk water with about 5 mJ/cm^2, which according to the bottom figure above should result in about a log 3 reduction in T7. This is what was observed in our experiment. Our experiment resulted in a slightly higher log reduction, but this can likely be attributed to the manual activation and deactivation of the bulb. Furthermore, with a 13 second treatment from our UV reactor we were expecting to irradiate the water with 40 mJ/cm^2, which in our experiment resulted in about log 9 reduction in T7, which is corroborated by the bottom figure above. Since UV dosage is linearly related to time by the dosage rate, which is the output of our model, the results of this experiment indicate that an 18.9 second treatment in our reactor would result in about 60 mJ/cm^2 dosage.

Microbiological Testing Procedure

Fluid Clarity

We spiked water with Bentonite clay derived from cat litter and ran the water through the system. The system handled the challenging water for a small amount of time before applying too much back pressure to the pump (kill switch at about 50 psi was triggered). After inspection of the filters, it was observed that the clay had filled the filter housings and had clogged the carbon block filter pores (nominal 0.5 um rating). Although the effluent water from the system was notably clear compared to the affluent water stream, we did not make spectrophotometer measurements of the water clarity due to our system's failure. Although we spiked the water with higher concentrations of clay than found in nature, in future iterations it is recommended to include some form of back-washing to the filters to avoid this problem.

PHOTOS OF CLOGGED FILTERS TO BE ADDED

Flow Rate Testing

DATA AND VIDEO TO BE UPLOADED

Battery Testing

Graph of Battery Charging Characteristics

Graph of Battery Charging Characteristics

Final Project Documentation

Final Tech Paper

Final Poster

Final BOM

Final Assembly Models & Drawings

UV Chamber Final Design

UV Chamber Final Design

Final Endcap Design

Final Endcap Design

Final Design

Final Design

Final Assembly Drawing

Final Electrical Schematics

Final Design

Final Design

Final Design

Final Design

Final Design

Final Design

Electric Component Enclosure

Electric Component Enclosure

Final UV Model

Finalized UV Model average dosage rate at longitudinal points along bulb. Average was calculated by weight of volume that a treated cross section contributes to the system.

Finalized UV Model average dosage rate at longitudinal points along bulb. Average was calculated by weight of volume that a treated cross section contributes to the system.

Finalized UV Model including MPSS Attenuation Factor Calculation. The graph on the left shows the dosage vs time for our reactor. The graph on the right shows the theoretical flowrate through our system.

Finalized UV Model including MPSS Attenuation Factor Calculation. The graph on the left shows the dosage vs time for our reactor. The graph on the right shows the theoretical flowrate through our system.

UV Batch Treatment Model

Assembled System

Final Assembled System

Final Assembled System

Plans for Wrap-up

Phil's Three Week Plan

Ryan's Three Week Plan

Alex's Three Week Plan

Erik's Three Week Plan

Aaron's Three Week Plan

Graham's Three Week Plan

Justin's Three Week Plan


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