# Development of Technology for the Boleaching of Uranium in a Solution of Bacterial Immobilization
## 4 Discussion  
The use of wood chips coated with iron hydroxide as an immobilizing agent demonstrates remarkable efficiency, enhancing the oxidation rate of ferrous iron to 10-15 g/L of \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & **pH** & **RP** & **Fe2+** & **Fe3+** & **H2 SO4** \\ \hline \multirow{2}{*}{**pH**} & 1 & 0.476 [1] & \(-\)0.490 [1] & 0.518 [1] & \(-\)0.829 [1] \\  & 323 & 323 & 323 & 323 & 323 \\ \hline \multirow{2}{*}{**RP**} & 0.476 [1] & 1 & \(-\)0.906 [1] & 0.911 [1] & \(-\)0.237 [1] \\  & 323 & 323 & 323 & 323 & 323 \\ \hline \multirow{2}{*}{**Fe2+**} & \(-\)0.490 [1] & \(-\)0.906 [1] & 1 & \(-\)0.952 [1] & 0.240 [1] \\  & 323 & 323 & 323 & 323 & 323 \\ \hline \multirow{2}{*}{**Fe3+**} & 0.518 [1] & 0.911 [1] & \(-\)0.952 [1] & 1 & \(-\)0.248 [1] \\  & 323 & 323 & 323 & 323 & 323 \\ \hline \multirow{2}{*}{**H2 SO4**} & \(-\)0.829 [1] & \(-\)0.237 [1] & 0.240 [1] & \(-\)0.248 [1] & 1 \\  & 323 & 323 & 323 & 323 & 323 \\ \hline \end{tabular} \({}^{\dagger}\) The correlation is significant at 0.01 (two-sided).  
\end{table} 
Table 2: Pearson correlation of indicators of the ALS solution from the bioreactor. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & **pH** & **U** & **RP** & **Fe2+** & **Fe3+** \\ \hline \multirow{2}{*}{**pH**} & 1 & 0.892 * & \(-\)0.591 & 0.355 & \(-\)0.581 \\ \hline \multirow{2}{*}{**U**} & 0.892 * & 1 & \(-\)0.704 & 0.437 & \(-\)0.597 \\ \hline \multirow{2}{*}{**RP**} & \(-\)0.591 & \(-\)0.704 & 1 & \(-\)0.946 * & 0.925 * \\  & 323 & 323 & 323 & 323 & 323 \\ \hline \multirow{2}{*}{**Fe3+**} & \(-\)0.581 & \(-\)0.597 & 0.925 * & \(-\)0.899 * & 1 \\ \hline \end{tabular} \({}^{\ddagger}\) The correlation is significant at 0.05 (two-sided).  
\end{table} 
Table 3: Pearson correlation of technological indicators of the productive solution on BOI-1. iron per hour, which opens new possibilities for industrial applications. This approach offers advantages in terms of economic efficiency and raw material accessibility, potentially positioning it as a competitive alternative to more expensive and technologically complex solid carriers. In the context of prevailing trends emphasizing sustainable development and environmental protection, incorporating such immobilizing agents into production cycles is a strategy that provides a balance between economic benefits and ecological integrity. The use of immobilizers ensures the increased efficiency of continuous bioreactors, allowing for bacteria to be retained on the surface of the solid carrier even at high flow rates of the solution, reaching 360-450 mV through the biooxidation of ferrous iron. The deployment of continuous bioreactors with an immobilized oxidation system of ferrous iron is promising for various applications. It finds use in metal extraction from ores and wastewater treatment processes. Moreover, the use of an immobilized system based on an immobilizer coated with Fe(OH)\({}_{3}\) provides an additional electrostatic effect, facilitating the attachment of bacteria to surfaces with different surface charges. The immobilizer provides a larger surface area for bacterial attachment, thereby increasing the pool of bacteria available for the oxidation of ferrous iron. This technology, utilizing such immobilizing agents for the bioactivity of the solution, demonstrates promising efficiency, providing a high rate of oxidation of ferrous iron. In biological leaching processes, for instance, as described in studies such as [26] [PERSON] et al. 's \"Bioreactor Leaching of Uranium from Low-Grade Indian Silicate Ore,\" the optimal density of the \"pulp\" plays a crucial role in enhancing the efficiency of uranium extraction. Maintaining the pulp density at 20-40% ensures optimal contact between microorganisms (such as the enriched culture of A. Ferrooxydans) and the ore, which enhances the rate and efficiency of leaching. Thus, the effective management of pulp density is a critical aspect of maximizing the process efficiency.