ศึกษาเวลาเพิ่มและลดระดับน้ำในหอสุญญากาศต่อการกำจัดความขุ่น ในถังตกตะกอนชนิดชั้นตะกอน

Wiwat Onnakklum

Authors

Wiwat Onnakklum Mahasawat Water Treatment Plant, Metropolitan Waterworks Authority

Keywords:

sludge blanket clarifier , turbidity removal efficiency

Abstract

This paper aims to study effect of rising time and falling time in vacuum chamber on turbidity removal by sludge blanket clarifier. A 40-second and a 50-second of rising time and a 10-second, a 12-second and a 14-second of falling time were experimented. By controlling surface loading rate, 3.22 m/hr., and aluminum sulphate adding rate, 20 mg/l. Experiment found that rising time, falling time and interaction between rising time and falling time were significantly affected on turbidity removal efficiency. Turbidity removal efficiency increased as rising time was increased or falling time was increased. But, turbidity removal efficiency was not increased for a 14-second of falling time. The highest turbidity removal efficiency of clarifier was 90.61±0.89% in case rising time was 50 second and falling time was 12 second.

References

Al-Dawery, S. K., Hussain, R. M. & Shibeeb, K. M. (2007). Performance of pulsator clarifier (low turbidity). Iraqi Journal of Chemical and and Petroleum Engineering, 18, 9-17.

American Water Work Authority(AWWA) & American Society of Civil Engineer(ASCE). (1990). Water Treatment Plant Design. 4th ed. New York: McGraw Hill.

Chomsuwan, C. (2009). Improvement turbidity removal efficiency of clarifier in water treatment. M.E.dissertation(Industrial Engineering). Bangkok: Kasetsart University. (in Thai)

Degremont, G. (1990). Water Treatment Handbook. Vol.2. Paris: Lavoisier Publishing.

Dorea, C.C. (2009). Coagulant-based emergency water treatment. Desalination, 248, 83-90.

Eardprapan, S. (2002). Investigation of Operating Criteria and Efficiency of Sludge Blanket Clarifier at Pangpuay Water Treatment Plant, Ratchaburi province. M.E.dissertation(Environmental Engineering). Bangkok: Kasetsart University. (in Thai)

Hurst, M., Weber-Shirk, M. & Lion, L. W. (2010). Parameter affecting steady-state floc blanket performance. Iraqi Journal of Water Supply: Research and Technology-AQUA, 59.5, 312-323.

Intrto, S. (2005). Effect of pulsation rate, surface overflow rate and suction height on turbidity removal efficiency of pulsator clarifier. M.Sc.dissertation(Environmental Technology). Nakorn Pathom: Mahidol University. (in Thai)

Panatampon, R. (1997). The Feasibility Study on High Turbidity and Poorly Settleable Raw Water for Water Supply Production by Coagulation. M.E.dissertation(Civil Engineering). Bangkok: Kasetsart University. (in Thai)

Tantipalakul, Y., Palawatwichai, K., Detchakan, T. & Khaisan, J. (2018). The study of optimal coagulants for water treatment process of Metropolian Waterworks Authority. Burapha Science Journal, 23(1), 207-220.

Twort, A. C., Ratnayaka, D. D. & Brandt, M. J. (2006). Water Supply. 5th ed. Oxford: Butterworth-Heinamann.

Wangpaisarn, T. (2003). Water Supply Engineering. 2nd ed. Bangkok: Chulalongkorn University press. (in Thai)