## 3 Results
### Mitigation of Odor and Targeted Gases as a Function of UV-A Dose
#### 3.1.2 Volatile Organic Compounds  
UV-A photocatalysis showed a significant odorous VOCs mitigation (Table 2). UV dose \(\geq\) 4.0 mJ\(\cdot\)cm\({}^{-2}\) partially removed four to six targeted VOCs. The highest dose (5.3 mJ\(\cdot\)cm\({}^{-2}\)) resulted in a statistically significant percent reduction of dimethyl disulfide (62%), isobutyric acid (44%), butanoic acid (32%), \(p\)-cresol (40%), indole (66%) and skatole (49%). \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**UV Dose** **(m)\(\cdot\)cm\({}^{-2}\))** & \begin{tabular}{c} **Light** \\ **Intensity** \\ **(mW\(\cdot\)cm\({}^{-2}\))** \\ \end{tabular} & \begin{tabular}{c} **Treatment** \\ **Time (s)** \\ \end{tabular} & \begin{tabular}{c} **Control** \\ **(OU\({}_{\text{E}}\cdot\)m\({}^{-3}\))** \\ \end{tabular} & \
\begin{tabular}{c} **Treatment** \\ **(OU\({}_{\text{E}}\cdot\)m\({}^{-3}\))** \\ \end{tabular} &
\begin{tabular}{c} **\% Reduction** \\ **(\(p\)-Value)** \\ \end{tabular} \\ \hline \hline \multicolumn{6}{c}{**UV Dose Control with Light Intensity and Treatment Time**} \\ \hline
1.9 & 0.04 and 0.41 & 15.8 and 3.2 & 448 \(\pm\) 75 & 457 \(\pm\) 54 & \(-\)2.0 (0.91) \\
2.9 & 0.04 and 0.41 & 23.8 and 4.8 & 424 \(\pm\) 41 & 379 \(\pm\) 25 & 10.5 (0.32) \\
2.9 & 0.04 and 0.14 & 43.3 and 8.7 & 377 \(\pm\) 13 & 401 \(\pm\) 76 & \(-\)6.2 (0.93) \\
4.0 & 0.04 and 0.26 & 43.3 and 8.7 & 359 \(\pm\) 60 & 218 \(\pm\) 28 & **39.3 (0.03)** \\
5.3 & 0.04 and 0.41 & 43.3 and 8.7 & 412 \(\pm\) 47 & 251 \(\pm\) 4.6 & **39.6 (0.04)** \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Mitigation of odor with UV-A photocatalysis treatment. Control temperature = 28.5 \(\pm\) 2.3 \({}^{\circ}\)C, control RH = 69.8 \(\pm\) 9.5%, treatment temperature: 31.5 \(\pm\) 1.2 \({}^{\circ}\)C, treatment RH = 66.0 \(\pm\) 4.3%, values in the table are mean \(\pm\) S.D. Bold signifies statistical significance. \begin{table}
\begin{tabular}{c c c c c c} \hline
**UV Dose** & **Light Intensity** & **Treatment** & **Control** & **Treatment** & **\% Reduction** \\
**(m)**\(\cdot\)**cm\({}^{-2}\))** & **(mW\(\cdot\)**cm\({}^{-2}\))** & **Time (s)** & **(ppm)** & **(ppm)** & **(\(p\)-Value)** \\ \hline \multicolumn{5}{c}{**UV Dose Control with UV Light Intensity and Treatment Time**} \\ \hline
1.9 & 0.04 and 0.41 & 15.8 and 3.2 & 0.8 \(\pm\) 0.0 & 0.9 \(\pm\) 0.0 & \(-\)4.0 (0.07) \\
2.9 & 0.04 and 0.41 & 23.8 and 4.8 & 0.8 \(\pm\) 0.0 & 0.8 \(\pm\) 0.1 & 4.1 (0.13) \\
2.9 & 0.04 and 0.14 & 43.3 and 8.7 & 2.0 \(\pm\) 0.4 & 1.9 \(\pm\) 0.2 & 4.9 (0.35) \\
4.0 & 0.04 and 0.26 & 43.3 and 8.7 & 1.8 \(\pm\) 0.6 & 1.7 \(\pm\) 0.5 & 9.0 (0.05) \\
5.3 & 0.04 and 0.41 & 43.3 and 8.7 & 0.6 \(\pm\) 0.1 & 0.4 \(\pm\) 0.0 & **26.2 (0.01)** \\ \hline \end{tabular}
\end{table} 
Table 3: Mitigation of N\({}_{2}\)O with UV-A photocatalysis treatment. Control temperature = 28.5 \(\pm\) 2.3 \({}^{\circ}\)C, control RH = 69.8 \(\pm\) 9.5%, treatment temperature: 31.5 \(\pm\) 1.2 \({}^{\circ}\)C, treatment RH = 66.0 \(\pm\) 4.3%, Values in the table are mean \(\pm\) S.D. Bold signifies statistical significance. \begin{table}
\begin{tabular}{c c c c c} \hline
**UV Dose** & **Light Intensity** & **Treatment** & **Control** & **Treatment** & **\% Reduction** \\
**(m)**\(\cdot\)**cm\({}^{-2}\))** & **(mW\(\cdot\)**cm\({}^{-2}\))** & **Time (s)** & **(ppm)** & **(ppm)** & **(\(p\)-Value)** \\ \hline \multicolumn{5}{c}{**UV Dose Control with Light Intensity and Treatment Time**} \\ \hline
1.9 & 0.04 and 0.41 & 15.8 and 3.2 & 896 \(\pm\) 81 & 1016 \(\pm\) 108 & \(-\)13.5 (0.33) \\
2.9 & 0.04 and 0.41 & 23.8 and 4.8 & 737 \(\pm\) 12 & 892 \(\pm\) 18 & \(-\)**21.2 (0.01)** \\
2.9 & 0.04 and 0.14 & 43.3 and 8.7 & 1032 \(\pm\) 21 & 1380 \(\pm\) 104 & \(-\)**33.7 (0.03)** \\
4.0 & 0.04 and 0.26 & 43.3 and 8.7 & 1032 \(\pm\) 21 & 1251 \(\pm\) 40 & \(-\)**21.2 (0.02)** \\
5.3 & 0.04 and 0.41 & 43.3 and 8.7 & 1201 \(\pm\) 296 & 1534 \(\pm\) 105 & \(-\)27.8 (0.16) \\ \hline \end{tabular}
\end{table} 
Table 4: Mitigation of CO\({}_{2}\) with UV-A photocatalysis treatment.