## 9 Conclusions  
In this work, waste generation data of RCC were recorded and the average waste generation per person was calculated as 0.4214 kg/day. Considering this value, the total waste generation in the city corporation per day was estimated to be 358.19 tons. The calorific value of the MSW was determined to be 14.9 MJ/kg, and possible electric energy generation was estimated to be 159.40 MWh/day. Therefore, this possible energy from waste can be used to reduce the energy crisis in RCC. Another advantage of WTE conversion is the reduction of surface water, groundwater and air pollution, which occurs due to open dumping. Furthermore, the revenues will be collected by selling generated power and would generate a reasonable profit. Other important parameters, like recyclable waste values, amount of pollution from the waste, etc., also need to be considered for a better understanding of the overall waste management of RCC. During the survey, it was observed that none of the families had waste separation practices. Thus, source separation of waste should be implemented for better handling of the municipal waste. Controlled dumping, instead of open dumping, should be started. Future recommendations for waste management have been discussed in this work, along with the present conditions of MSW generation and management in RCC, with potential treatment strategies. Therefore, a  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Input Parameters** & **Values** \\ \hline Capital expenditure (CAPEX) & (369 \(\ast\) 3.85) or BDT 1421 million \\ Fixed operating cost (\% of CAPEX/year) [42, 45] & 3 \\ Fixed operating cost & (1421 \(\ast\) 3\%) or BDT 42.6 million \\ Variable operating cost (USD 4.4*MWh) [42, 43] & (4.4 \(\ast\) 28,696) or USD 126,262.2 or BDT 10.7 million \\ Revenue from compost per day & BDT 0.39 million \\ Revenue from compost per year & BDT 142 million \\ Cost of electricity (assumed) & BDT 7 per kWh (generally varies in between BDT 6 and 8) \\ Annual revenue from electricity & (7 \(\ast\) 28,696 \(\ast\) 1000) or BDT 201 million \\ Annual net cash inflow & (201 + 142 \(-\) 42.6 \(-\) 10.7) or BDT 290 million \\ Payback period (CAPEX/annual net cash inflow) & (1421/290) or 4.9 years \\ \hline \hline \end{tabular}
\end{table}
Table 11: Cont.  
proper waste management system should be employed without any delay due to the increasing rate of MSW generation in RCC. As an enormous amount of energy can be harvested from this waste, WTE conversion must be given priority. Anaerobic digestion has been found to be reliable in this aspect, as most of the MSW contents are food and vegetables. The energy potential from the anaerobic digestion process has been calculated as 3.85 MW, which can be utilized to meet the energy crisis of this city corporation. Cost analysis of the proposed plant has also been performed and the payback period has been estimated to be 4.9 years.  
All the authors have contributed substantially to the work reported. Conceptualization, M.E.H., M.R.A.B. and M.A.; Methodology and Survey, M.A.H. and M.M.A.; Data curation, M.A.H. and M.M.A. and M.E.H.; Formal Analysis, M.E.H. and M.A.; Writing--Original Draft Preparation, M.A.H. and M.M.A.; Writing--Review and Editing, M.E.H., M.R.A.B. and M.A. All authors have read and agreed to the published version of the manuscript.  
This research is partially supported by JSPS KAKENHI Grant Number 19K04211.  
Not applicable.  
Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.  
The data presented in this research are available on request from the corresponding author.  
The authors would like to acknowledge the department of Mechanical Engineering, Rajshahi University of Engineering & Technology, Bangladesh for supporting the research work.  
The authors declare no conflict of interest.