water treatment works Technical Specification水厂设计说明.doc

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water treatment works Technical Specification水厂设计说明.doc

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water treatment works Technical Specification水厂设计说明

Contents 1. OVERVIEW 1 1.1. Project background 1 1.1.1. Project name and Employer 1 1.1.2. Design scope 1 1.2. Design Reference 3 1.2.1. Design Reference 3 1.2.2. Main criteria and standards 4 2. INTRODUCTION 6 2.1. Background 6 2.2. Location of Works 7 2.3. Existing Facilities 7 2.3.1. Telecommunications 7 2.3.2.Electrical Power 7 2.3.3. Water Supply 8 2.3.4. Wastewater treatment 8 2.3.5. Accommodation 8 2.3.6. Medical Facilities 8 2.4. Climate 8 3. PROCESS DESIGN 11 3.1. Raw water quality 11 3.2. Treated Water Quality 12 3.3. Design capacity 14 3.4. Process Design 14 3.4.1. Water Treatment Process 14 3.4.2. Sludge Disposal Process 15 3.5. Site Planning 17 3.6. Elevation plan 17 3.7. Water treatment structure 18 3.7.1. Inlet structure / Aeration 18 3.7.2. Dissolved Air Flotation Clarifiers (DAF) (Future) 19 3.7.3. Flash mixing 19 3.7.4. Flocculators and Clarifiers Tank 19 3.7.5. Rapid Gravity Filters 23 3.7.6. Clear Water Storage Tank 25 3.7.7. The Backwash Blower House of the filter 26 3.7.8. High-lift pump station 26 3.7.9. Chemical Dosing room 28 3.7.10. Chlorination room 33 3.7.11. Dirty Wash Water Tank 35 3.7.12. Supernatant treatment structure 37 3.7.13. The auxiliary structures of the water works 41 3.7.14. Design for public utilities onsite 41 4. Structural Design 43 4.1. Design Life 43 4.2. Building Materials 43 4.2.1 Cement 43 4.2.2. Concrete 43 4.2.3. Steel and Welding Rod 43 4.2.4. Materials for Brick Wall and Masonry Mortar 44 4.2.5. Plastering Materials 44 4.3. Structure Proposal 44 4.3.1. Inlet Structure/Aeration 44 4.3.2. Rapid Mixing Structure 45 4.3.3．Flocculation and Sedimentation Tank 45 4.3.4．Filter 47 4.3.5．Clear Water Storage Tank 48 4.3.6．Filter Backwash Air Blower Room 49 4.3.7. High-lift Pump Station and Substation 49 4.3.8．Chemical Dosing Room 49 4.3.9．Chlorination Room 50 4.3.10．Backwash Water Tank 50 4.3.11．Sludge Wastewater Treatment Structure 51 4.3.12. Technical Requiements of Pipeline and Trench Backfill 53 4.4.Excavation of Foun