Comparison of Wastewater Treatment Costs Between Johkasou and Sewerage Systems, Considering Johkasou Sludge Treatment —Case Study of Awaji City—

Key Points

• The objective is to compare the costs of wastewater treatment between Johkasou systems and traditional sewerage, including sludge treatment expenses.
• Analyzed total project costs for current sewerage plans versus Johkasou system including sludge treatment.
• Evaluated the cost-saving effects of introducing a sludge consolidation vehicle.
• Assessed financial implications over a 30-year period.
• Total project costs show Johkasou is economically favorable due to high sewer construction costs.
• Ignoring sludge treatment, Johkasou shows a cost advantage of 60.6% compared to sewerage.
• Considering sludge treatment, Johkasou's advantage increases to 77.6%.
• Implementing sludge consolidation reduces vacuum truck cleaning costs by 14%, and 12% considering household decrease.