在921 大地震之後，臺灣山區土體鬆動，岩性脆弱，又加以山坡陡峻，每在颱風或豪雨過境時即造成坡地崩塌，使大量土石進入水體，造成原水濁度急遽升高。且台灣水庫多為在槽水庫，上游沖刷下來的土石會直接進入水庫，使水庫取水口的取得的原水濁度超過淨水場的設計處理能力，必須減量出水甚至關場因應。其中最為人所知的為石門水庫於2005 年多次颱風來襲期間因濁度過高關場而影響到南桃園的供水，造成民眾生活極大的不便和產業的巨大衝擊。
本研究嘗試分析以傳統原水處理程序中的過濾程序，對高濁度原水進行處理之效率。研究中以高雄地區古亭坑泥岩之泥，依不同比例調製成高濁度原水，配合不同粒徑組合的砂層濾床，量測在不同濾速條件下的過濾效果。主要目的乃是希望嘗試藉由原水直接過濾的方式，作為原水在進入淨水廠的前處理設施，冀期可以快速降低原水的濁度至淨水場可以處理承擔的範圍之內，以求確保未來淨水場的長期穩定供水。實驗結果顯示，以0.710～0.425mm 之濾砂過濾4000NTU 之高濁度原水，可以全程維持40％以上之濁度去除率。

After the 921Chi-Chi Earthquake, The earth materials of mountain area in Taiwan were loosened and rock weakened. With steep slope and weakened rocks, debris of rocks and soils will fall into the water during typhoon or raining season; thus cause the turbidity of water body to jump up.
Most reservoirs in Taiwan are in-basin reservoirs. Debris of rocks and soils from upstream regions can easily be flashed into the reservoirs; namely, water treatment plant of public water supply system was frequently forced to close down due to the high water turbidity. Water treatment plant of Shihmen Reservoir was closed down due to the high water turbidity during the typhoon season has been the most well known incident in 2005. It had widely affected the public water supply in southern Taoyuan region.
Purpose of this work was set to quickly lower the turbidity of intake water in order to match the capability of water treatment plant; namely to obtain a stable water supply even during the extreme weather season that may highly increase the turbidity of the water body.
A sand filter system was adopted to evaluate its efficiency on removal of water turbidity. Water of different turbidities was made by using the earth materials from Gutingkeng formation mudstone of Kaohsiung area, Taiwan. The turbidity removal efficiency due on the different grain size sand filter layer and different infiltration flow rates was evaluated, in respectively.
Results of the experiments showed that a 40% efficiency of turbidity removal can be obtained by using 0.425~0.710 mm grain size sand filter layers under the designated infiltration flow rate.

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