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“3W (Wet Weather Wastewater) treatment process” is an innovative treatment technique developed by Osaka city which can treat 3 times volume of sewage inflow, and greatly reduce the pollutant load of combined sewer overflow in wet weather by modifying the existing treatment facilities. Combined sewer system has been widely prevalent in Osaka City due to the installation easiness and low cost, but this combined system presents pollution in wet weather because untreated sewage is discharged from combined sewer outfalls or pumping stations together with stormwater when sewage flow exceeds the capacity of sewer systems.

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