Sewage Works in Osaka, Japan

Table of Contents

Profile of Osaka

Climate of Osaka

• Temperature and Precipitati

Progress and Improvement The Development of Osaka's Sewerage System

• Topographical features of Osaka
• Taiko (Sewari) Gesui : The Basis of Osaka's Sewerage System
• History of Modern Sewerage System
• Spread of Flush Toilet System in accordance to the expansion of Sewer Network

(1) Sewerage Areas in Osaka City
(2) The Twelve Sewage Treatment Plants

(1) Flood Control Projects to Provide Safer Living Environment

• The area where stormwater cannot be discharged by gravity flow
• Flood Control Measures
• Major Construction Projects
• Localized Flood Control Measures
• The subsidy for household rain water store tanks
• Rainfall Information System

(2) Water Quality Enhancement Project to Ensure Clean Water

• Advanced wastewater treatment
• Combined Sewer Overflow Control
• Wastewater Sludge Centralized Treatment

(3) Amenities Project to Establish Recycling Society with Comfortable Environment

• Effective use of the upper space of sewerage facilities
• The Sewerage Science Museum
• Reuse of Treated Wastewater
• Effective Use of Melted Slag
• Reuse of energy from waste in the sewage treatment process

(4) Reconstruction and Renewal

• Work Efficiency Improvement
• Development of the Earthquake Resistant Sewerage System

Operation and Maintenance (O&M) of Sewerage System

• Sewerage facility (sewer) management system (AS System)
• Operation and Maintenance (O&M) of sewers
• Operation and Maintenance (O&M) of Sewage Treatment Plants
• Operation and Maintenance (O&M) of Pumping Stations
• Response to citizen needs
• Wastewater quality control

• International Exchange
• Acquisition of Environmental Management System Certificates

(1) Developed Sewerage Systems through Advanced-Technology R&D (R&D : Research and Development)

• Effective use of land in sewerage facilities
• Development of Thermophilic / High Concentration Anaerobic Digestion System
• A Power Generation System Utilizing Digestion Gas
• Automatic Monitoring System of Industrial Wastewater Quality
• Sedimentation process using inclined plate settlers
• Step inflow type Two-stage Nitrification-denitrification process with carrier addition

(2) Implementing the joint research with private companies

• Phosphorus recovery as MAP (magnesium ammonium phosphate) from digested sludge
• Research on effective removal of nitrogen contained in effluent from dewatering process of digested sludge
• Adoption of Innovative Shield Tunneling Method

• Sewer User Charges

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