5. Estimated Capital and Operating Costs
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MAYNILAD WATER SERVICES, INC. MWSS Compound, Katipunan Road, Balara, Quezon City E1288 v 12 Public Disclosure Authorized DRAFT FINAL REPORT CONCEPT DESIGN Public Disclosure Authorized Project 7 Sewage and Septage Treatment Plant Public Disclosure Authorized August 2006 Program Management Group Maynilad Water Services Inc. 2nd Floor Engineering Building Old Balara, Katipunan Road, Quezon City Telephone No.: +632.433.6978 Facsimile No.: +632.435.2128 Public Disclosure Authorized Website: http://www.mayniladwater.com.ph Copyright C 2006 by Program Management Group. All rights reserved. The concepts and information contained herein are the property of MWSI. Use or copying of this document in whole or in part without the written permission of MWSI constitutes an infringement of copyright. Project 7Prototype STP/SpTP 8/17/2006 Page i L Document History and Status l Checked/Reviewed Approved by / Date Revision Date Issued Prepared by by Signature Approved A. S. August Draft Final August 2006 Sampiano M. R. Pedron P.N. Rosete 2006 J.C. S. Iglesia F. A. Arellano Distribution of Copies Revision Copy No. Quantity Issued to Draft Final 1 1 MWSI 2 1 DENR 3-: MWSS Printed : 17 August 2006 Last Save : 17 August 2006 Filename : CD:/Project 7 Concept Design Report Author : A.S.Sampiano Office : Water Sources and Wastewater Facilities Development (WSWFD), PMG Managers : (1) M.R. Pedron, Manager -WSWFD, PMG (2) J.C. S. Iglesia, AVP - Program Planning and Design, PMG Support Group : Environment Managernent Dept., Sewerage and Sanitation Dept. Version : Draft Final Project 7Prototype STP/SpTP 8/17Q2006 Page ii Table of Contents Executive Summary .................................. v Section 1. Introduction ......................................................................... 1.1 General Background ............................ 1 1.1.] World Bank Mission .......................... 1 1.2 Objectve .......................2 ......... 2 1.3 Limitation of the Study ........................... 2 Section 2. Quezon City Communal System and Its Condition ........ 3 2.1 Project 7 Imhoff Tank ............................ 5 Section 3. Review of the Pre-feasibility Report ................. 8 Section 4. MWSI Proposed Alternative 0..................... 4.1 Design Assumptions and Criteria ..................... 10 4.1.1 Service Areas and Land se .................... 10 4.1.2 ProjectedSewage and Septage Volume ............. 10 4.1.3 Wastewater Characteristicsand PolluitionLoading....... 10 4.2 Process Flow for Prototype STP/SpTP .................. 11 4.2.1 Components of Proposed.SpTP .................. 12 4.2.2. ('ompotnents of Proposed.S7P ................... 13 4.2.3 Odor Control acili 4.........................14 4.3 Theoretcal Performance ..........................14 4.4 Improvement in the Level of Service ................... 16 Section 5. Estimated Capital and Operating Costs ............... 16 5.1 Estmated Capital Expenditures ...................... 16 5.2 Estimated Operabng Expenses ...................... 18 Section 6. Recommendations ........................... 19 Section 7. Other Issues and Concerns ..................... 20 7.1 Social Acceptability ............................. 20 7.2 Traffic Accessibility .............................. 20 List of Figures Figure 2.0-1 Location Map of Project 7 and Project 8 ................... 4 Figure 2.0-2 Plan and Section of the Existing Imhoff Tank ................5 Figure 2.1-1 Site Layout of Imhoff Tank Facility in Project 7 ...............6 Figure 2.1-2 Influent/ Effluent BOD Levels against DENR AO 35 Required Standards. 7 Figure 4.2-1 Process Flow Diagram for Proposed Project 7 Prototype STP/SpTP . 12 Figure 4.3-1 Mass Balance Flow Diagram .........................15 List of Tables Table A Summary of Capital and Operating Cost .................. vi Table 2.1-1 Monthly Billed Volume (cmd) for Sewered Customers in Veterans Village. 7 Table 2.1-2 Monthly Influent Data for Project 7 Imhoff Tank ................8 Table 2.1-3 Monthly Effluent Data for Project 7 Imhoff Tank ................8 Table 4.1.3-1 Monthly Influent Data for Dagat-Dagatan Septage Treatment Plant . 11 Table 4.2.3-1 Classification and Source of Odor ........................ 14 Table 4.3-1 Theoretical Performance of Proposed Prototype STP/SpTP ....... 16 Table 5.1-1 Construction Cost Estimates of the Prototype STP/SpTP ..........17 Table 5.1-2 Breakdown of Cost per Chamber ......................... 18 Table 5.2-1 Estimated Operating Cost of the Prototype STP/SpTP ............19 Project 7Prototype STP/SpTP 8/17/2006 Page iii Abbreviations and Acronyms ADF - Average Daily Flow AO - Administrative Order BOD - Biochemical Oxygen Demand CMSS - Central Manila Sewerage System COD - Chemical Oxygen Demand CST - Communal Septic Tank EDSA - Epefanio delos Santos Avenue EO - End-of-Year GEF - Global Environmental Facility MOA - Memorandum of Agreement MP - Master Plan MTSP - Metro Third Sewerage Project PLC - Programmable Logic Control RAS - Returned Activated Sludge SBR - Sequencing Batch Reactor SpTP - Septage Treatment Plant SS - Suspended Solids STP - Sewage Treatment Plant TSS - Total Suspended Solids UASB - Upflow Anaerobic Sludge Blanket WAS - Waste Activated Sludge DENR - Department of Environmental and Natural Resources LLDA - Laguna Lake Development Authority LMTP - La Mesa Treatment Plant MWCI - Manila Water Company, Incorporated MWSI - Maynilad Water Services, Incorporated MWSS - Metropolitan Waterworks and Sewerage System NHA - National Housing Authority WB - World Bank m - Meter(s) m2 square meter(s) cum. - cubic meter(s) mL - Milliliter mg/L - Milligram per liter(s) cmd - Cubic meter per day MPN - Most Probable Number pH - potential Hydrogen Php - Philippine Peso Sqm - Square meter(s) USD - United State Dollar Project 7Prototype STP/SpTP 8/17/2006 Page in Executive Summary World Bank has a mission to reduce pollution loading discharges in Metro Manila area. Through the Global Environmental Facility - World Bank Technical Assistance (GEF-WB TA) for Manila Third Sewerage Project (MTSP) under DENR, a consultant has been engaged to conduct a pre-feasibility study for the prototype treatment plant for sewage and septage. Several facilities within the MWSI concession area have been considered and due to its advantages the existing Imhoff Tank facility in Project 7, Quezon City has been recommended to be the pilot project. The existing facility will be rehabilitated and upgraded to accommodate a given amount of septage. The consultant's study also indicates that the facility owner has to invest a certain percentage of the total project cost. This report presents the results and recommendations of a study to develop an alternative concept design for the proposed prototype sewage/septage treatment plant (STP/SpTP). This study aims to: (a) develop a process flow using state-of-the-art technology; (b) examine potential savings in capital expenditure and operating costs; and (c) assess other issues and concerns on environmental and social impacts of the project. Major activities of the study involve data gathering, review and updating of water quality data, developing various process flow options, and estimating capital and operating costs for the proposed altemative. The proposed prototype STP/SpTP will be an underground facility. The treatment facilities have been designed to accommodate an estimated sewage flow of 2,400 cmd from the Veterans Village in Project 7 and an additional septage volume of about 240 cmd from other areas in Quezon City (west) and Caloocan. Proposed Altematives of the Prototype STP/SpTP in Project 7, Quezon City In order to meet its sanitation target at a minimum investment cost, MWSI developed an alternative scheme other than that indicated in the pre-feasibility study, summarized as follows: 1. Pre-feasibility altematives * Sewage (2,400 cmd) + Septage 0% (Ocmd) - full aerobic biotreatment; * Sewage (2,400 cmd) + Septage 10% (240 cmd) - full aerobic biotreatment; Sewage (2,400 cmd) + Septage 5% (120 cmd) - anaerobic-aerobic biotreatment; * Sewage (2,400 cmd) + Septage 10% (240 cmd) - anaerobic-aerobic biotreatment * Sewage (2,400 cmd) + Septage 15% (360 cmd) - anaerobic-aerobic biotreatment 2. MWSI proposed altemative * Sewage (2,400 cmd) + Septage 10% (240 cmd) - full-aerobic biotreatment; The pre-feasibility alternatives consist of full aerobic biotreatment (SBR) and anaerobic- aerobic biotreatment (UASB+SBR). The existing Imhoff Tank with 2 chambers will be upgraded to 2 balancing tanks to hold the mixture of sewage and filtrate in one tank and screened and degrited septage in the other. Project 7Prototype STP/SpTP 8/17/2006 Page v For scenarios Al (pure 2,400 cmd sewage) and A2 (Al+ 240 cmd septage), full aerobic biotreatment using 2 fill-and-draw Sequencing Batch Reactors (SBRs) is applied prior to discharge of effluent to Culiat Creek. The treatment process for scenarios B1 (Al+120 cmd septage), B2 (A1+240 cmd septage) and B3 (A1+360 cmd septage) involves anaerobic-aerobic biotreatment utilizing a UASB or an Upflow Anaerobic Sludge Blanket and an SBR. This process is similar to full aerobic biotreatment except that, the mixture of filtrate and sewage is pumped to the UASB for carbon scrubbing then to the SBR for effluent polishing. The alternative process proposed by MWSI treats sewage and septage separately. Two (2) SBR's will be used to treat sewage and septage in series. Septage is treated using an equalization tank for pre-aeration before it goes to the SBR (SpTP). The primary effluent is mixed with fresh sewage