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  • JAPAN INTERNATIONAL COOPERATION AGENCY (JICA)

    TOKYO ENGINEERING CONSULTANTS CO., LTD. (TEC)NIPPON KOEI CO., LTD. (NK)

    PREPARATORY SURVEYFOR

    BANGKOK WASTEWATERTREATMENT PROJECT

    INTHAILAND

    FINAL REPORT (II) FEASIBILITY STUDY

    VOL. 1 SUMMARY

    BANGKOK METROPOLITANADMINISTRATION (BMA)

    JULY 2011

    SAP

    JR

    11-020

  • as of October 1, 2010 1 Baht = 0.0330 US dollar 1 Baht = 2.76 yen

  • i

    Table of Contents

    1. WORK SCHEDULE AND IMPLEMENTATION OF PHASE 2 WORK................................1 1.1 Work Schedule for the Entire Survey and Objectives of Phase 2 Work................................1 1.2 Project Area of the Phase 2 Work..........................................................................................1 1.3 Implementing Organizations in Thailand..............................................................................1 1.4 Basic Policies for the Survey ................................................................................................1 1.5 Survey Organization..............................................................................................................1

    2. OUTLINE OF NONG BON TREATMENT AREA .................................................................3 2.1 Outlines of the Treatment Area .............................................................................................3 2.2 Target Year, Planning Area, Wastewater Collection System, and Reuse of Treated

    Wastewater and Sludge .........................................................................................................3 2.3 Design Frame........................................................................................................................5 2.4 Site for Construction of WWT..............................................................................................6

    3. PRELIMINARY DESIGN OF INTERCEPTOR......................................................................7 3.1 Design of Interceptors...........................................................................................................7

    3.1.1 Design Wastewater Flow..................................................................................................7 3.1.2 Basic Items .......................................................................................................................8

    3.2 Routing of Interceptors .......................................................................................................10 3.2.1 Route Selection ..............................................................................................................10 3.2.2 Summary of Interceptors................................................................................................12

    3.3 Issues and Technical Countermeasures in Future................................................................12 3.3.1 Prevention of Back Flow from Klong............................................................................12 3.3.2 Enhancement of Connection of Uncollected Wastewater to Interceptor ........................12 3.3.3 Strengthening of Operation and Maintenance of the Existing Drainage Pipes ..............13

    4. PRELIMINARY DESIGN OF NONG BON WWTP.............................................................14 4.1 Basis for Planning...............................................................................................................14

    4.1.1 Outline of Nong Bon WWTP.........................................................................................14 4.1.2 Design Wastewater Characteristics ................................................................................14 4.1.3 Projected Dry Weather Flow and Design Capacity of WWTP.......................................14 4.1.4 Design Concepts and Requirements...............................................................................15

    4.2 Selection of Wastewater Treatment Process........................................................................16 4.2.1 Comparison of Alternatives............................................................................................16

    4.3 Facilities Planning...............................................................................................................16 4.3.1 Concepts for Facilities Planning ....................................................................................17 4.3.2 Design Wasewater Flow.................................................................................................17 4.3.3 Receiving Water Body ...................................................................................................17 4.3.4 Hydraulic Profile Planning.............................................................................................18

  • ii

    4.3.5 Selection of Sludge Treatment Process ..........................................................................18 4.3.6 Countermeasure for Climate Change .............................................................................19 4.3.7 Process of Nong Bon WWTP.........................................................................................19 4.3.8 Outlines of Facilities Planning.......................................................................................20

    5. COST ESTIMATION AND IMPLEMENTATION SCHEDULE...........................................24 5.1 Project Cost .........................................................................................................................24

    5.1.1 Condition of Cost Estimation.........................................................................................24 5.1.2 Estimated Project Cost ...................................................................................................24 5.1.3 Estimated Operation and Maintenance Cost ..................................................................25

    5.2 Implementation Schedule and Disbursement Schedule ......................................................26 5.2.1 Implementation Schedule...............................................................................................26 5.2.2 Disbursement Schedule ..................................................................................................28

    5.3 Management and Institutional Issues ..................................................................................29 5.3.1 Implementation Management.........................................................................................29 5.3.2 Operation Management..................................................................................................31

    5.4 Technical Assistance ...........................................................................................................32 5.4.1 Training..........................................................................................................................32 5.4.2 Program for Improvement of Management of Sewerage Works....................................32

    6. ENVIRONMENTAL AND SOCIAL CONSIDERATIONS...................................................34 6.1 Environmental and Social Considerations Study................................................................34 6.2 Identification of Negative Impacts due to Implementation of the Project, Consideration

    of Mitigation Measures and Monitoring Plan.....................................................................35 6.3 Public Awareness Survey ....................................................................................................40

    6.3.1 Outline of the Survey .....................................................................................................40 6.3.2 Summary ........................................................................................................................41

    6.4 Stakeholder Meeting ...........................................................................................................41

    7. ECONOMIC AND FINANCIAL ANALYSIS........................................................................43 7.1 Evaluation of Wastewater Tariff..........................................................................................43

    7.1.1 Plan of BMAs Wastewater Tariff Collection.................................................................43 7.1.2 Willingness to Pay (WTP) and Affordability to Pay (ATP) for Wastewater Tariff.........43

    7.2 Economic Analysis..............................................................................................................45 7.2.1 Basic Assumptions .........................................................................................................45 7.2.2 Economic Cost ...............................................................................................................46 7.2.3 Economic Benefits .........................................................................................................47 7.2.4 Result of Economic Analysis and Sensibility Analysis..................................................49

    7.3 Financial Analysis ...............................................................................................................50 7.3.1 Basic Assumptions .........................................................................................................50 7.3.2 Financial Cost ................................................................................................................50

  • iii

    7.3.3 Revenue Prediction ........................................................................................................51 7.3.4 Result of Financial Analysis........................................

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