CONTENTS 1 Introduction 5 1.1 Background . 5 1.2 About the topic or Rationale and Justification 6 1.3 Aim and Objective . 7 1.4 Research Question and Methodology . 7 2 Methodology . 8 2.1 Thought Process 9 2.1.1 Primary Data 9 2.1.2 Secondary Data . 9 2.1.3 Analysis 9 2.2 Existing Scenario of Sewerage in Ahmedabad 11 2.3 Site selection . 13 2.4 About the Site . 14 2.5 Limitation of the study 16 3 Literature Review 17 3.1 Centralised and Decentralised Sewage Infrastructure 17 3.2 Environment friendly and Sustainable Sewage Treatment Plants and its need 18 3.3 Decentralisation Sewer Infrastructure and its implantation 21 3.4 Case studies . 22 3.4.1 DEWATS . 22 3.4.2 Solid and Liquid Resource Management ( SLRM ) - Vellore Model . 23 3.4.3 Nepal - Different Landuse . 23 3.4.4 Lismore City . 24 3.4.5 Mumbai case studies . 25 3.5 Guidelines . 26 3.6 Conclusion . 27 4 Analysis - Calculations related to sewage infrastructure . 28 4.1 Population in the township A 28 4.2 Interview of the Builder Company of Township A 28 4.3 Interviewing the Plumbing consultants . 29 4.4 Calculating Infrastructure for centralised sewage system 30 4.4.1 Cost estimation from the Case Study 30 4.4.2 Capital cost 31 4.4.3 Operational Cost of Centralised sewage Treatment Plant . 32 4.5 Calculations for implementing the conventional decentralised Sewage Treatment Facility and Infrastructure in the township A 32 4.5.1 Capital cost of conventional Electrical Sewage Treatment Plant . 33 4.5.2 Operating Cost of Conventional Electrical sewage treatment Plant 33 4.6 Calculations for implementing the environment friendly decentralised Sewage Treatment Facility and Infrastructure ( Reed Bed System ) in the township A 34 4.6.1 Case study site visit 35 4.6.2 Capital cost . 38 4.6.3 Operating Cost of Reed Bed System 39 5 Comparative Analysis . 40 5.1 Which system in beneficial - Today and why . 40 5.2 Advantages and disadvantages of Decentralised STP 42 5.2.1 Advantages of Decentralised Conventional Sewerage Infrastructure . 42 5.2.2 Disadvantages of Decentralised Conventional Sewerage Infrastructure . 42 5.3 Centralised Sewerage system 43 5.3.1 Benefits of Centralised Sewerage Infrastructure . 43 5.3.2 Disadvantages of Centralised Sewerage Infrastructure . 43 6 Conclusion . 44 6.1 Comparative table 44 6.2 Why promote environmental friendly reed bed 44 6.2.1 Carbon Foot Print . 44 6.3 Overall Comparison - Cost, Space, Energy Requirement etc 47 6.4 TOD, BOD, COD treatment efficiency 48 6.5 People's perspective on the system which is beneficial 49 6.6 Water and Sewerage co relation . 50 6.7 Benefit to the Government from the decentralised system . 52 6.8 Benefit to the residents . 53 6.9 Benefit to the environment . 53 6.10 Recommendations . 54 6.10.1 Conceptual Implementation Of Reed Bed System in Township A . 54 6.11 How to adopt environmental friendly sewage treatment systems . 58 7 Bibliography . 61 8 Annexure 62