Which CDM methodology is the best option? A case study of CDM business on S-Water treatment plant

Clean development mechanism (CDM) validity study was conducted to suggest better and more adaptable CDM scenario on water treatment plant (WTP). Potential four scenarios for CDM project; improvement of intake pumping efficiency, hydro power plant construction, solar panel construction and system optimization of mechanical mixing process were evaluated on S-WTP in Korea. Net present value (NPV) of each scenario was estimated based on sensitivity analysis with the variable factors to investigate the CDM validity percentile. Hydro power plant construction was the best option for CDM business with 97.76% validity and $1,127,069 mean profit by 9,813 tonsCO₂e/yr reduction. CDM validity on improvement of intake pumping efficiency was 90.2% with $124,305 mean profit by huge amount of CO₂ mitigation (10,347 tonsCO₂e/yr). System optimization of mechanical mixing process reduced 15% of energy consumption (3,184 tonsCO₂e/yr) and its CDM validity and mean profit was 77.25% and $23,942, respectively. Solar panel construction could make the effect of 14,094 tonsCO₂ mitigation annually and its CDM validity and mean profit was 64.68% and $228,487, respectively.