Đánh giá nhu cầu oxy sinh hóa và cặn lắng sơ cấp, sục khí và làm sạch trong ở nhà máy xử lý nước thải cảu Viện Phát triển thành phố Yangon_Myanmar_Evaluation on biochemical oxygen demand and solids of primary sedimentation aeration and final clarifier in wastewater treatment plant of yangon city development committeeBackground InformationYangon is the largest city and is highly urbanized.Since 1888 the wastewater discharged from six downtown townships of Yangon were discharged by conventional disposal system directly into Yangon River.JustificationWWTP is located in Botahtaung Township.It was opened on December, 2006.It treats the wastewater discharged from six downtown townships of Yangon city and disposes the effluent into the Yangon River. The treatment plant has the capacity of 3.25 million gallons per day (MGD). It is now treating about 500,000 gallon of wastewater per day. The two main pipe lines were used for conveying wastewater from these six townships. Wastewater is treated by the processes; preliminary treatment stage, primary treatment stage, biological treatment stage and sludge treatment stage and then the effluent is discharged into the Yangon River.In the WWTP, temperature and pH of wastewater are monitoring routinely.But biochemical oxygen demand (BOD) and solid matters are not measured in this treatment plant. Biochemical oxygen demand and solid matters are important parameters in wastewater treatment. This study aims to assess the biochemical oxygen demand and solids of the effluent in the WWTP. The result of this study is intended to evaluate the effectiveness of the WWTP.Existing Sewerage System in Yangon CitySanitation and sewerage for the Yangon City area is main responsibility of Engineering Department (Water and Sanitation) under Yangon City Development Committee.Existing system, conventional sewerage, consists of: (1) Gravity sewers (2) Thirty nine pneumatic ejector stations (3) Air distribution main (4) Two sewage force mains and outlet
Evaluation on Biochemical Oxygen Demand and Solids of Primary Sedimentation, Aeration and Final Clarifier in Wastewater Treatment Plant of Yangon City Development Committee Min Thu Naung MBBS MMedSc (Public Health) ID-290 INTRODUCTION Background Information • Yangon is the largest city and is highly urbanized • Since 1888 the wastewater discharged from six downtown townships of Yangon were discharged by conventional disposal system directly into Yangon River Justification • WWTP is located in Botahtaung Township • It was opened on December, 2006 • It treats the wastewater discharged from six downtown townships of Yangon city and disposes the effluent into the Yangon River The treatment plant has the capacity of 3.25 million gallons per day (MGD) It is now treating about 500,000 gallon of wastewater per day The two main pipe lines were used for conveying wastewater from these six townships Wastewater is treated by the processes; preliminary treatment stage, primary treatment stage, biological treatment stage and sludge treatment stage and then the effluent is discharged into the Yangon River Justification (Cont:) • In the WWTP, temperature and pH of wastewater are monitoring routinely • But biochemical oxygen demand (BOD) and solid matters are not measured in this treatment plant Biochemical oxygen demand and solid matters are important parameters in wastewater treatment • This study aims to assess the biochemical oxygen demand and solids of the effluent in the WWTP • The result of this study is intended to evaluate the effectiveness of the WWTP Existing Sewerage System in Yangon City Sanitation and sewerage for the Yangon City area is main responsibility of Engineering Department (Water and Sanitation) under Yangon City Development Committee Existing system, conventional sewerage, consists of: (1) Gravity sewers (2) Thirty nine pneumatic ejector stations (3) Air distribution main (4) Two sewage force mains and outlet Treatment Processes in Wastewater Treatment Plant of YCDC Treatment process is called activated sludge process The treatment process can be divided into four stages They are; (1) Preliminary Treatment Stage (2) Primary Treatment Stage (3) Biological Treatment Stage (4) Sludge Treatment Stage Preliminary Treatment Stage Auto bar screen, pump sump and grit chamber are included Primary Treatment Stage Primary sedimentation tank is used for the solid separation Biological Treatment Stage Aeration tanks are designed followed by the secondary sedimentation tanks Sludge Treatment Stage Sludge thickener tank and sludge digester tank are included OBJECTIVES General Objective To evaluate the biochemical oxygen demand and solids of wastewater influent, effluent of primary sedimentation, effluent of aeration and effluent of final clarifier in Wastewater Treatment Plant of Yangon City Development Committee Results in Day Series Results of pH Level of Wastewater Results of Temperature (C) of Wastewater Results of BOD (mg/l) of Wastewater CONCLUSION According to test results, average percentage removal efficiency of BOD was 98.81% in overall treatment and the mean value of effluent is 9.4 mg/l Average percentage removal efficiency of suspended solid was 90.83% in overall treatment and the mean value of effluent is 155.75 mg/l All the pH values were also within the permissible range In this study, the influent of the treatment plant was not suitable for disposing into the living environment without treatment But the effluent of the treatment plant was acceptable to dispose into the Yangon River without harm THANK YOU ... the biochemical oxygen demand and solids of wastewater influent, effluent of primary sedimentation, effluent of aeration and effluent of final clarifier in Wastewater Treatment Plant of Yangon City. .. demand and solids of the effluent of primary sedimentation in Wastewater Treatment Plant (3) To assess the biochemical oxygen demand and solids of the effluent of aeration in Wastewater Treatment Plant. .. assess the biochemical oxygen demand and solids of the effluent of final clarifier in Wastewater Treatment Plant (5) To compare the qualities of wastewater influent and effluent of Wastewater Treatment