## 4 Discussion
In this more favorable case, it would have to supply the reactor with a total of 2484 kg/year of plastic waste (2.48 t/year). On the other hand, the total amount potentially available of the Syntra model luminaire is 35,593 luminaires in the Alto Alentejo region. (Figure 1 and Table 1). Thus, the total plastic coming from the substitutions of this luminaire in the entire Alto Alentejo area would total 63,921.46 Kg. Therefore, only the plastic recovered from the Syntra model luminaires in the Alto Alentejo Region would allow having guaranteed plastic fuel for 25 years. Taking into account that the biomass of the olive tree is close to the production centers, it would guarantee the availability of fuel in the long term. Indeed, the power of the production equipment has been adjusted to the total power that we are going to obtain based on the energy characteristics of the synthesis gas produced. This allows the equipment to adjust to the power we expect to produce and therefore reduces the \"K\" investment costs, making the solution and equipment dimensions more in line with the expected production reality. We have observed that the gas with the highest energy quality, for the reasons argued in that section, results in the proportion of 10% of plastic. The consequences are that the total electrical energy that we hope to produce is also for this higher proportion of approximately 10.79 kWh/h, or approximately 38,835.08 kWh/year, which makes us have an annual income of \(\mathfrak{C}\) 7767.02/year, compared with 8.65 kWh/h, and 31,145.40 kWh/year in the case of 100% olive biomass. Additionally, 7.90 kWh/h, and 28,430.53 kWh/year produce 20% plastic, despite having to make a slightly greater investment in a 15-kW gasifier, 5 kW more in the case of 10% plastic. Then, we observe that adding the plastic fraction in a moderate proportion (10%) produces a more energetic synergistic gas with more hydrogen, capable of producing more electrical energy and producing numbers in the form of better economic indicators. In particular, the VPN. However, when the plastic fraction exceeds 10% and we are at 20%, the energy quality of syngas decreases as we analyze in Section 3.2 (an analysis of the syngas produced). It is for this reason that, in order to achieve a better performance of the equipment as a whole, a gasifier with more power has been chosen in the case of 10% plastic, as we expect a higher annual energy production. However, we have also carried out the simulation for a 10-kW gasifier unit, (K Investment (EUR 12,000)), for 10% plastic, observing that even the economic indicators improve even more obtaining a 4-year amortization with an NPV of EUR 3096 and a 10-year NPV of EUR 20,829, with an IRR 33.45% and an IBmC of 0.31. However, it would be advisable to make a design for 15 kW in anticipation of future expansions of the production plant, although the investment is higher and the indicators are slightly lower  
On the other hand, from the environmental point of view, the establishment of a gasification unit for WEEE will help to reduce the environmental impact of its deposition causes. Compared to traditional combustion technology [96], gasification contributes to less atmospheric emissions produced per kWh; in addition, as mentioned above, increasing the efficiency of a gasification system will also have an environmental impact [97], reducing the amount of lignocellulosic biomass used [98]. However, the higher efficiencies attributed to gasification systems usually come with higher initial capital requirements compared to combustion technology [99]; but, on the other hand, gasification systems will save on operating costs while reducing greenhouse gas emissions, helping the Portuguese government meet increasingly stringent EU pollution standards [100,101].