## 3 Results and Discussion
ash after plasma-chemical treatment; sample 05--slag obtained during the incineration of household waste (primary raw material); sample 06--slag after plasma-chemical treatment; sample 07--fiber obtained from slag during the plasma-chemical process when the power was 55.5 kW; sample 08--fiber produced when the power was 55.6 kW and 09-74 kW. After analyzing the results of the EDS tests, it became clear that in wood ash, in the primary material (sample 01), the predominant elements are C--15.7, O--59.5, and Ca--15.6%, while the remaining elements, such as Na, Al, S, and others, occupy a vanishingly small part. It is likely that most of the oxygen and Ca exist in the formed compounds in the form of oxides. As can be seen, the predominant elements in wood ash after plasma-chemical treatment are basically the same (C--14.4, O--58.6-59.5, and Ca--18.6%). A slight change in the percentage composition is observed after the plasma process. Analysis of the elemental composition of fly ash obtained by burning household waste (taken from air filters) (sample 03) revealed that the predominant elements are C--12, O--45.6, S--4.9, Cl--13.4, and Ca--17.5%. Meanwhile, after the plasma-chemical processing of fly ash (sample 04), the predominant elements are C--11.9, O--55.1, S--1.4, Cl--7.5, and Ca--19.1%. A slight decrease in the contents of the predominant elements is visible. The results of the EDS tests show that the elemental compositions and predominant elements of the primary material of slag obtained by burning household waste (sample 05) are C--12.9, O--61.3, Si--7.6, and Ca--10.6%. Meanwhile, after plasma-chemical slag processing (sample 06), the predominant elements are C--114, O--65.6, Si--9.4, and Ca--5%. As you can see, the remaining elements make up a vanishingly small percentage. Analyzing the EDS results, a tendency that can be observed is that the percentage of metals decreased after plasma-chemical treatment in all cases. This is determined by the fact that at a high plasma temperature (in the plasma-chemical channel), part of the metals are melted and evaporated. During plasma-chemical processing, fiber was obtained (it was possible to obtain fiber only by processing the slag obtained during the incineration of household waste). The results of the EDS tests showed (samples 07-09) that the predominant elements in the composition of the fiber showed varied percentages--C: 36-39, O: 43-46, Si: 6-7.4, and Ca: 5.2-6.6%. Oxygen exists as oxides forming quartz and CaO. From the thermal process that took place in the plasma-chemical channel, the process temperature during the plasma-chemical treatment was estimated. These research results are presented in Figure 3. The temperature distribution in the plasma-chemical channel was obtained by calculating the overall heat balance. As can be seen from the research results, the highest process temperature was used during the wood processing, and it decreased from 2800 to 2500 \({}^{\circ}\)C. Regarding the representation of these results, the temperature dependence is presented on the relative length x/d, where d is the entire length of the plasma-chemical channel (25 cm), and x is any selected distance from the inlet of the channel. The temperature decreases most rapidly from 2650 to 2200 \({}^{\circ}\)C during fly ash processing. The temperature change process is influenced by the fact that different types of input products consume different amounts of heat released  
\begin{table}
\begin{tabular}{l l l l l l l l l l l l l} \hline
**No. C** & **O** & **No** & **Mg** & **Al** & **Si** & **P** & **S** & **O** & **K** & **Ca** & **Ti** & **Fe** \\ \hline
01 & 157 \(\pm\) 0.1 & 95.5 \(\pm\) 0.5 &  
by the plasma flow. As can be seen, the temperature of the process does not fall below 2000 \({}^{\circ}\)C throughout the length of the channel, which means that such conditions are sufficient (the process temperature must be at least 1800 \({}^{\circ}\)C) for completely neutralizing various dangerous compounds present in both fly ash and slag.