Tài liệu Pilot surface water treatment plant Hoa An, Vietnam pdf

Part Project 2: Improvement of the Rural Water Supply Pilot Surface Water Treatment Plant Hoa An, Vietnam Manual & Documentation (Version from the 27.09.2007) Funded by the Federal Ministry of Research and Education, Germany (Project ID 02WD0621) SANSED II Part Project 2: Water Supply The Pilot Surface Water Treatment Plant Hoa An was developed within the Project – Part Project 2: Improvement of the Rural Water Supply funded by the German Federal Ministry of Research and Education (BMBF) Project ID 02WD0621 Authors Dipl.-Ing Thomas Nuber, Environmental Engineering and Ecology, Ruhr-University Bochum, Germany Frank Benstoem, Environmental Engineering and Ecology, Ruhr-University Bochum, Germany Dipl.-Geoökol Thilo Herrmann, Ingenieurbüro Technische Hydrologie, Bayreuth, Germany M.Eng Le Anh Tuan, Department of Environmental and Water Resources Engineering, College of Technology, Can Tho University, Vietnam II Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION Contents Introduction 1.1 Idea of the pilot surface water treatment plant 1.2 Purpose of the manual .1 1.3 Contact .1 Treatment Concept .3 2.1 Treatment Capacity 2.2 Water Catchment 2.3 Flocculation 2.4 Sedimentation 2.5 Rapid Sand Filtration 2.6 Slow Sand Filtration 2.7 Disinfection UV-Lamp .6 2.8 Disinfection with Chlorine Dimensioning 3.1 Sedimentation Tanks 3.1.1 Sedimenation Area .7 3.1.2 Flow Rate 3.1.3 Flow Velocity .7 3.1.4 Retention time .8 3.2 Tube Reactors 3.2.1 Equations for the dimensioning of the Tube Reactors 3.2.2 Dimensioning of the Micro Flocculation Reactor R-1a and R-2a: .9 3.2.3 Dimensioning of the Macro Flocculation Reactor R-1b and R-2b .10 3.3 Rapid-Sand-Filter 11 3.3.1 Diameter of the filter 11 3.3.2 Filter Height 11 Electrical Set-up 12 4.1 Operating Mode 12 How to get the treatment plant started .14 III SANSED II Part Project 2: Water Supply How to shut down the treatment plant 18 Troubleshooting 18 Maintenance .18 Literature 22 10 Appendix 23 IV Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION Symbols, Abbreviations, Dimensions PSWTP Pilot Surface Water Treatment Plant A [m²] Area d [m] Diameter G [ s −1 ] Velocity gradient l [m] Length Q [m / s ] Flow rate Re [−] Reynolds coefficient t [s] Time v [m / s ] Flow velocity λ [−] Loss coefficient υ [m ² / s ] Kinematic viscosity V SANSED II Part Project 2: Water Supply Figures Fig 1: Process Overview Fig 2: Process Flow Chart 1/3 .24 Fig 3: Process Flow Chart 2/3 .25 Fig 4: Process Flow Chart 3/3 .26 Fig 5: Plan View 27 Fig 6: Sedimentation Tanks 28 Fig 7: Electrical Installation 29 Tables Tab 1: Electrical components 12 Tab 2: Parts List 30 VI Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION Introduction 1.1 Idea of the pilot surface water treatment plant At Hoa An research station - belonging to Can Tho University - a student dormitory and other research facilities are under construction The existing ground water supply will not meet the prospective fresh water demands of about 300 people in the nearest future In the framework of the SANSED-Project a pilot surface water treatment plant (PSWTP) Is being constructed in Hoa An The PSWTP should be used for scientific purposes but it should also be able to supply the research station with water For the design of the pilot surface water treatment plant the following conditions had to be reached: • treatment steps are easy to understand • treatment plant can be rebuilt with parts available in Vietnam • low costs and low maintenance but efficient • robust Besides standard treatment components (e.g sedimentation tanks, disinfection) tube reactors where the flocculation takes place and a slow sand filter are applied The tube reactors provide a reliable formation of settleable flakes even under sub-optimal operating conditions and not need maintenance 1.2 Purpose of the manual In this manual treatment steps are explained, the dimensioning of significant components is shown and recommendations for maintenance are given as well as a description how to start up and how to shut down the plant This manual also contains a documentation of the treatment plant including technical outlines, part lists and pictures taken during the installation process Manuals of additional equipment (e.g dosage pumps, UV-Lamp, etc.) are also enclosed 1.3 Contact For information, questions and problems please contact: SANSED II Part Project 2: Water Supply Dipl.-Ing Thomas Nuber Ruhr-University Bochum, Germany Environmental Engineering & Ecology Universitätsstr 150 44780 Bochum, Germany Tel:: + 49 (0) 234 – 32 28277 email: thomas.nuber@rub.de Or : Le Anh Tuan, M.Eng Can Tho University College of Technology Department of Environmental and Water Resources Engineering Campus II, 3/2 Street, Can Tho City, Vietnam email: latuan@ctu.edu.vn Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION Treatment Concept In the following section the concept of the pilot surface water treatment plant (PSWTP) is described An overview of the applied purification process of the surface water is given in the Fig Water Catchment Al3+ Flocculation Sedimentation From Rinsing Water Storage To Sludge Discharge Rapid Sand Filtration Slow Sand Filtration To Rinsing Water Storage UV-Disinfection NaOCl Chlorination To distribution network Legend Qmax [m³/h] = 3,0 1,5 Project: Treatment Plant Hoa Anh, Vietnam Title: Process Flow 1/3 Date: 30.07.2007 Editor: Frank Benstöm Fig 1: Process Overview For detailed process information see Fig to Fig in the appendix A list of all components of the PSWTP is given with their labelling and technical specifications in Tab of the appendix A plain view of the PSWTP is shown in Fig in the appendix SANSED II Part Project 2: Water Supply 2.1 Treatment Capacity The PSWTP is designed for a maximum flow rate of m³/h 2.2 Water Catchment The surface water is abstracted with the submersible water pump (P-1c(I)) from the water reservoir located in the canal next to the PSWTP Non-return valve V-1c prevents already treated water to flow back to the catchment when the pump is switched off The water catchment itself consists of a fence surrounding the submersible pump preventing bigger particles (e.g leaves) of blocking the system (Photo 1) The pressure of raw water is increased by pump P-1a(I) situated inside the treatment plant The flow rate of raw water is measured by the flow rate meter I-1 and can be adjusted using valve V-1a to the desired flow rate Water samples of the raw water can be taken at sampling valve V-1b 2.3 Flocculation The treatment goal of the flocculation is to destabilize non-settleable particles in the raw water and to agglomerate small particles by forming flocs For the destabilization and agglomeration Polyaluminiumchloride (PAC) solution is used as flocculant It is stored in stock solution tank S-1 Stirrer M-1 is used to guarantee a homogeneous mixture when fresh PAC solution has to be prepared by solving PAC in water The PAC stock solution is added to the water stream with dosing pump P-1b The typical “pulsated-dosage-characteristic” of the dosing pump is smoothened with pulsation damper D1 This secures a continuously dosage for optimal mixture with the water stream and to maximize accuracy of measuring the flow rate with flow rate meter I-2 (Photo 2) In injection nozzle N-1 the PAC stock solution and the water stream are rapidly mixed by changing the tube diameter This leads to an instantaneous change in velocity and therefore turbulences are formed within the tube Water samples can be taken at sample valve V-2b After that the water stream is split into sub-streams Every single stream passes one tube reactor (R-1a and R-2a) with small diameter for micro-flocculation Water samples can be taken after the micro-flocculation at sample valve V-3b and V-4b Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION Maintenance Inter- Pos Process val Proceedings 6.) Backwash for at least 10 minutes 3.8 Cleaning injection nozzle N-1 1.) Switch off treatment plant 2.) Unscrew injection nozzle N-1 3.) Clean nozzle N-1 from flocculant residues 3.9 Cleaning sedimentation tank E-1 monthly 1.) Switch off treatment plant 2.) Release water completely by opening Valve V-5a 3.) Rinse out sedimentation tank with hose 3.10 Cleaning sedimentation tank E-2 1.) Switch off treatment plant 2.) Release water completely by opening Valve V-6a 3.) Rinse out sedimentation tank with hose 4.11 Check submersible pump P-1c(I) half-yearly 1.) Switch off treatment plant 2.) Take out submersible pump P-1c(I) from catchment and clean if needed 21 Literature GROHMANN, A (1981): ZEITSCHRIFT FÜR WASSER- UND ABWASSER-FORSCHUNG, JAHRGANG 14, NR 5/6, S 194-209, VERLAG CHEMIE GMBH, WEINHEIM, 1981 HAHN, HERMANN H (1981): WASSERTECHNOLOGIE: FÄLLUNG, FLOCKUNG, SEPARATION, SPRINGER VERLAG, BERLIN, 1987 HANKE, K (2000) WASSERAUFBEREITUNG – CHEMIE UND CHEMISCHE VERFAHRENSTECHNIK, ÜBERARBEITETE AUFLAGE, SPRINGER-VERLAG, BERLIN, 2000 Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION 10 Appendix 23 SANSED II Part Project 2: Water Supply Fig 2: Process Flow Chart 1/3 24 Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION Fig 3: Process Flow Chart 2/3 Rapid Sand Filter F-1a From Storage Tank Rapid Sand Filter F-1b Junction V-9a V-13a V-10a V-14a V-7b Slow Sand Filter F-2 Junction V-12a V-16a V-11a To UV Lamp V-15a Junction To Sludge Discharge Project: Treatment Plant Hoa Anh, Vietnam From Rinsing Water Storage Title: Process Flow 1/3 Date: 30.07.2007 25 Editor: Frank Benstöm SANSED II Part Project 2: Water Supply Fig 4: Process Flow Chart 3/3 P-3a UV To Water Storage Junction V-17a V-8b V-19a V-10b V-11b From Slow Sand Filter V-18a D-2 Rinsing Water Storage P-2b V-1d E-4 M-2 M P-4a NaOCl I-3 Stock Solution Tank, Chlorination S-2 To Rapid Sand Filter Backwash Junction V-9b Project: Treatment Plant Hoa Anh, Vietnam Title: Process Flow 1/3 Date: 30.07.2007 26 Editor: Frank Benstöm Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION Fig 5: Plan View Rinsing Water Storage E-4 From Slow Sand Filter F-2 To Distribution Network To Sludge Discharge To Slow Sand Filter F-2 To Sludge Discharge To Sludge Discharge From Water Catchment Ø1600,00 P-3a P-1a(I) Tube Reactor R-1a, R1-b P-4a Desinfection Lamp UV Ø1600,00 4000,00 Sedimantation Tank E-1 Rapid Sand Filter F-1b Ø600,00 Rapid Sand Filter F-1a Storage Tank E-3 Stock Solution Tank, Flocculation S-1 Ø1000,00 Ø1600,00 Storage: Flocculant and Chlorine Cupboard Tube Reactor R-2a, R2-b Table 4000,00 Ø1600,00 Sedimantation Tank E-2 Stock Solution Tank, Chlorination S-2 Ø800,00 P-2a 10100 Injection Nozzle N-1 Ø600,00 10200,00 Project: Surface Water Treatment Pilot Plant, Hoa An, Viet Nam 4000,00 Title: Electrical Installation Date: 30.07.2007 27 Editor: Frank Benstöm SANSED II Part Project 2: Water Supply Fig 6: Sedimentation Tanks From Tube Reactor R-1b, R-2b 70 mm Reduction Bushing 1300 mm 1850 mm 730 mm 2" To Storage Tank E-3 110 mm 1,5" Deflector 2" To Sludge Discharge 1600 mm Project: Treatment Plant Hoa Anh, Vietnam Title: Process Flow 1/3 Date: 30.07.2007 28 Editor: Frank Benstöm Fig 7: Electrical Installation L ES-1 ES-2 ES-4 ES-3 ES-5 ES-6 ESS-1 ES-7 ESS-2 ES-8 ES-10 ES-9 ESS-3 ES-11 ES-12 ES-13 ES-14 ES-15 ES-16 ES-17 ESS-4 Contactor Contactor ER-4 Contactor ER-1 ER-3 Contactor ER-2 P-1c (I) EL-1 EL-2 P-1c (II) P-1b P-1a (I) P-1a (II) P-3a P-2a P-2b P-4a UV LL-1 LL-2 LL-3 R-1 K-1 R-2 M EL-3 EL-4 EL-5 EL-6 EL-7 EL-8 EL-9 EL-10 EL-11 EL-12 EL-13 EL-14 EL-15 M EL-16 N Project: Surface Water Treatment Pilot Plant, Hoa An, Viet Nam Title: Electrical Installation Date: 30.07.2007 29 Editor: Frank Benstöm Tab 2: Parts List Item Labeling Properties Function Sedimentation Tank E-1 Height: 1,85 m Diameter: 1,6 m Sedimantation of Flakes Sedimentation Tank E-2 Height: 1,85 m Diameter: 1,6 m Sedimantation of Flakes Storage Tank E-3 Capacity: m³ Storage of Water after Sedimentation Rinsing Water Tank E-4 Capacity: m³ Storage of Water for Filter Backwash and Cleaning Purposes Flocculation Storage Tank L-1 Capacity: 250 l Storage of Stock Solution, Flocculant Chlorination Storage Tank L-2 Capacity: 60 l Storage of Stock Solution, Chlorine Rapid Sand Filter F-1a Height: m Diameter: 0,6 m Elimination of residue flakes Rapid Sand Filter F-1b Height: m Diameter: 0,6 m Elimination of residue flakes Rinsing Pump P-4a Flow Rate: m³/h Supply Water for Filter Backwash Dosing Pump (Flocculation) P-1b Flow Rate: l/h Dosage of Flocculant Dosing Pump (Chlorination) P-2b Flow Rate: l/h Dosage of Chlorine Submersible Water Pump P-1c(I) Flow Rate: m³/h Transport Crude Water from Canal to Treatment Plant 30 Item Labeling Properties Function Water Pump P-1a(I) Flow Rate: m³/h Booster Pump to increase Pressure of Crude Water Water Pump P-2a Flow Rate: m³/h Supply Water for Rapid Sand Filters Water Pump P-3a Flow Rate: m³/h Pump Water to Supply Network Tube Reactor (Micro Flucculation) R-1a Length: 25 m Development of Micro Falkes Diameter: 25 mm Tube Reactor (Micro Flucculation) R-2a Length: 25 m Development of Micro Falkes Diameter: 25 mm Tube Reactor (Macro Flocculation) R-1b Length: 15 m Development of Macro Flakes Diameter: 70 mm Tube Reactor (Macro Flocculation) R-2b Length: 15 m Development of Macro Flakes Diameter: 70 mm Pulsation Damper D-1 Provide constant Flow of Flocculant Pulsation Damper D-2 Provide constant Flow of Chlorine Flow Rate Meter I-1 Flow Rate: m³/h Measure Crude Water Flow Flow Rate Meter I-2 Flow Rate: l/h Flow Rate Meter I-3 Flow Rate: m³/h Measure Backwash Water Flow Injection Nozzle N-1 Provide intensive Mixture of Crude Water and Flocculant Regulating Valve / Check Valve V-1a Adjusting Crude Water Flow 31 Measure Floculant Flow Item Labeling Properties Function Regulating Valve / Check Valve V-2a Switch on/off Tube Reactor Regulating Valve / Check Valve V-3a Switch on/off Tube Reactor Regulating Valve / Check Valve V-4a Draining Tube Reactors for Maintanance Regulating Valve / Check Valve V-5a Sludge Release / Draining for Maintanance Regulating Valve / Check Valve V-6a Sludge Release / Draining for Maintanance Regulating Valve / Check Valve V-7a Sludge Release / Draining for Maintanance Regulating Valve / Check Valve V-8a Adjusting Flow to Rapid Sand Filters Regulating Valve / Check Valve V-9a Switch on/off Water Inlet Regulating Valve / Check Valve V-10a Sludge Release Regulating Valve / Check Valve V-11a Switch on/off Backwash Regulating Valve / Check Valve V-12a Switch on/off Water Outlet Regulating Valve / Check Valve V-13a Switch on/off Water Inlet Regulating Valve / Check Valve V-14a Sludge Release Regulating Valve / Check Valve V-15a Switch on/off Backwash Regulating Valve / Check Valve V-16a Switch on/off Water Outlet Regulating Valve / Check Valve V-17a Adjusting Flow to UV 32 Item Labeling Properties Function Regulating Valve / Check Valve V-18a Switch on/off Flow to Rinsing Water Storage Regulating Valve / Check Valve V-19a Switch on/off Flow to Supply Network Sampling Valve V-1b Water Samples, Crude Water Sampling Valve V-2b Water Samples after Dosage Flocculant Sampling Valve V-3b Water Samples after Microflocculation Sampling Valve V-4b Water Samples after Microflocculation Sampling Valve V-5b Water Samples after Makroflocculation Sampling Valve V-6b Water Samples after Sedimentation Sampling Valve V-7b Water Samples after Rapid Sand Filter F-1a Sampling Valve V-8b Water Samples after Slow Sand Filter F-2 Sampling Valve V-9b Tap for Preparing Stock Solutions and for Cleaning Purposes Sampling Valve V-10b Water Samples after UV-Disinfection Sampling Valve V-11b Water Samples after Chlorination Non-Return Valve V-1c Avoid Backflow to Canal Floating Valve V-1d Stop Refilling of Rinsing Water Storage when full Stiring Device M-1 Preparing a homogenous mixture of Flocculant 33 Item Labeling Properties Function Stiring Device M-2 Preparing a homogenous mixture of Chlorine UV Disinfection Lamp UV Disinfection 34 35 ... List 30 VI Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION Introduction 1.1 Idea of the pilot surface water treatment plant At Hoa An research station... Appendix 23 IV Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION Symbols, Abbreviations, Dimensions PSWTP Pilot Surface Water Treatment Plant A [m²] Area d [m]... 2000 Pilot Surface Water Treatment Plant Hoa An, Vietnam MANUAL & DOCUMENTATION 10 Appendix 23 SANSED II Part Project 2: Water Supply Fig 2: Process Flow Chart 1/3 24 Pilot Surface Water Treatment