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Student Number 93336004
Author Tsung-Kuei Kuo(郭琮貴)
Author's Email Address akuei7@mail.water.gov.tw
Statistics This thesis had been viewed 1929 times. Download 1376 times.
Department Executive Master of Environmental Engineering
Year 2005
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title The effect of raw water turbidity on the performance of the high-speed flocculation flat bottom type sludge blanket clarifier
Date of Defense 2006-07-09
Page Count 99
Keyword
  • achieving rate
  • flat bottom type-sludge blanket clarifier
  • turbidity
  • upflow velocity
  • Abstract The objective of this study was to investigate the effect of raw water turbidity on the performance of the high speed flocculation flat bottom type-sludge blanket clarifier in Pingjan water treatment plant. This study gathered the data of raw water quality of the plant during the periods from 2001 to 2005. The characteristics and distribution of raw water turbidity in relation to the achieving rate of effluent turbidity for the clarifier were discussed. On the other hands, to improve the achieving rate, the main factors which affect the performance of the clarifier, such as water quality, design parameters and operating conditions, were also investigated. Finally, the feasibility of improving effluent turbidity was evaluated by mixing with other influent source to form the sludge blanket when encountering low turbidity (5 to 10 NTU) in the raw water.
    According to the statistical data, the raw water turbidity was lower than 200 NTU with more than 90% of opportunity, except for the typhoon periods in summer and fall. However, the turbidity range in 5 to 15 NTU had the highest probability to occur (about 45%). The reason for low achieving rate of effluent turbidity, as was observed interestingly, had no concern with the season, though the variations of turbidity in the raw water was seasonal. Moreover, the upflow velocity and pH could maintain practically from 3.12 to 4.70 m/hr and 7.0 to 7.5, respectively, which were consistent with design parameters of the clarifier.
    The raw water turbidity other than pH and coagulant dosage had directly found to be related to the formation of sludge blanket, which became the key factor for the performance of the clarifier. The sludge blanket could not be formed well and led the achieving rate of effluent turbidity to reach only 76% when the raw water turbidity was 10 NTU approximately. The sludge blanket could be formed normally between 15 and 200 NTU of raw water turbidity, but operators should take care of controlling water quantities accordance with variation of turbidity. As to the high turbidity of raw water for storm weather and typhoon periods (higher than 200 NTU), the strategy of clarifier operation was to decrease the influent flow rate at this time, and the most important consideration was to withdraw sludge instead of forming blanket.
    In real-plant experiments of changing influent source, the raw water turbidity was increased to the range between 15 and 30 NTU by mixing 480,000 m3 of water from No. 195 water outlet of Shimen reservoir (about 5 to 10 NTU) and 86,000 m3 of that from the secondary pumping station (about 100 NTU). The stable sludge blanket in the clarifier was formed effectively. The concentration of blanket was about 200 mg/L at initial, but would gradually increase to the range of 400 to 800 mg/L with thickness of 2.5 to 3 m at average when reaching stable state. At this moment, the average removal of turbidity was about 87%, and effluent turbidity of the clarifier was lower than 5 NTU which meet the requirement of this plant.
    Table of Content 誌謝……………………………………………………………………………………
    摘要…………………………………………………………………………………..
    目錄………………………………………………………………………………….I
    圖目錄…………………………………………………………………………………II
    表目錄…………………………………………………………………………………V
    第一章前言…………………………………………………………………………1
    1.1研究緣起……………………………………………………………………1
    1.2研究目的..…………………………………………………………………2
    第二章文獻回顧…………………………………………………………………….3
    2.1高速膠凝沉澱池型式………………………………………………………3
    2.2平鎮淨水廠現況及基本資料………………………………………………7
    2.3污泥毯澄清池作用原理 …………………………………………………14
    2.4污泥毯澄清池特性…………………………………………………………15
    2.5影響污泥毯澄清池之效能因子……………………………………………18
    第三章研究流程與方法 ………………………………………………………….24
    3.1研究流程……………………………………………………………………24
    3.2研究方法……………………………………………………………………24
    3.3分析方法……………………………………………………………………27
    第四章結果與討論…………………………………………………………………29
    4.1歷年水質數據統計結果  ………………………………………………29
    4.2污泥毯澄清池濁度去除處理效能…………………………………………36
       4.2.190~94年澄清池出水濁度達成率………………………………….36
       4.2.2    90~94年進流原水濁度與澄清池出水濁度關係探討……………39
       4.2.3    影響澄清池處理效能因子探討……………………………………45
    4.3澄清池出水濁度不合格原因探討…………………………………………68
    4.4原水低濁度澄清池泥毯形成可行性評估 ………………………………92
    第五章結論與建議…………………………………………………………………96
    5.1結論…………………………………………………………………………96
    5.2建議…………………………………………………………………………97
    參考文獻……………………………………………………………………………..98
    Reference 參考文獻
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    2.Gregory, R., Floc Blanket Clarification, TR111, water Research Centre (WRc), Medmenham, UK, pp.1-7, London, 1979.
    3.Letterman, R. D., Water Quality and Treatment:a Handbook of Community Water Supply, J. AWWA, fifth edition, pp.6.1-7.87, 1999.
    4.Pontius, F. W., Water Quality and Treatment:a Handbook of Community Water Supply, J. AWWA, fourth edition, pp.270-425, 1990
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    6.Miller D. G., West J. T. and Robinson M., Water treatment Processes-I. Technical Paper TP 43, Water Research Association, United Kingdom, 1965.
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    8.Gould, B. W., “Flow Fluctuations In Solids Contact Clarifiers”, Proc:5th Fed. Conf., Aust. Water& Wastewater Assoc. Adelaide, 30th May to 2th June, pp.110-130, 1972.
    9.Gregory R., “Performance of Floc Blanket Clarification”, Personal communication, sixth August, 1996.
    10.Kan C., “Determination of Rapid Mixing Parameters in Coagulation: Destabilization Mechanisms and Aggregation Kinetics Appoach”, 2002
    11.Jacangelo J.G., Laine J.M., Cummings E.W. and Adham S.S., “UF with pretreatment for removing DBP precursors”, J. AWWA, 87, 3, pp.100-115, 1995.
    12.Semmens M. J. and Field T. K., “Coagulation: Experiences in Organics Removal”. J. AWWA, 72,8, pp.476-483, 1980.
    13.Schwartz B. F., “Calcium Nephrolithiasis : Effect of Water Hardness on Urinary Electrolytes”, Elseivier Science Inc. Urology,60,1,pp.23-27, 2002
    14.Sauvant M. P. and Pepin D., “Geographic Variation of the Mortality from Cardiovascular Disease and Drinking Water in a French Small Area ( Puy de Dome)”, Environmental Research, Section A 84,pp.219-227,2000.
    15.李丁來、邱芬蘭與黃志彬,“鹼性操作污泥氈去除硬度之研究”,第二十屆自來水研究發表會報告集,pp.249-264,台北,2003。
    16.陳兩全、宋尚宣、鍾翰憶、王之仲、林文煒、吳容銘、李篤中、李坤峰、莊瑞鑫與張嬉麗,“平底式污泥氈澄清池處理低濁度原水之膠羽特性”,第十七屆自來水研究發表會報告集,pp.149-170,嘉義,2000。
    17.洪嘉蔚與黃志彬,“有機物對污泥氈澄清池特性及處理效率影響之探討”,第二十一屆自來水研究發表會報告集,pp.363-372南投,2003。
    18.林文煒、宋尚宣、李篤中、李坤峰、莊瑞鑫與張嬉麗“原水有機物含量對污泥氈穩定性之影響”,第十八屆自來水研究發表會報告集,pp.321-336,宜蘭,2001。
    19.陳兩全、吳容銘、鍾翰憶、王之仲、林文煒、宋尚宣與李篤中, “高速膠凝沉澱池懸浮污泥毯操控之研究” 台灣省自來水公司委託計畫,2001。
    20.洪嘉蔚與黃志彬,“淨水廠污泥氈澄清池操作影響因子之探討”,中華民國自來水協會刊,第23卷,第4期,pp17-30,2004。
    Advisor
  • Dyi-Hwa Tseng(曾迪華)
  • Files
  • 93336004.pdf
  • approve immediately
    Date of Submission 2006-07-23

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