由於集水區山坡地水土保持不易，每當颱風或暴雨初期，易產生高濁度原水，影響淨水系統操作困擾。以慣性阻擋水流、延長水流路徑、增高溢流高度方法，可達到降低高濁度水質效益。經重力自行沉降去除，以達淨化水質目的。
本研究為以距水表面下不同之深度，模擬不同高濁度原水水質變化，經阻隔板延長水流途徑和溢流高度變化，以不同流量變化前處理高濁度原水，探討進、出流水之濁度、粒徑及懸浮固體物變化，並觀察沉降底泥及分析表面溢流率（SOR）、顆粒滯流時間、水流平均流速項目操作規範與實場比較去除效果。
經由實驗結果顯示，高濁度原水進流水濁度概略為1,500〜5,500 NTU之間，流量設計為：8、17、50和100 ml/s下，以慣性阻流、延長水流路徑、增高溢流高度方法，可達到降低高濁度水質效益。經重力自行沉降去除，以達淨化水質目的。以阻隔板前處理高濁度原水，大部份出流水皆於100〜1,000 NTU，去除率皆於50％以上，甚至可達70〜90％之間，甚可達90％以上，出流濁度可降至400 NTU。實驗沉降池表面溢流率（SOR）於19.1m/d時仍能維持54〜86％濁度去除效率、38.3m/d時能維持50〜72％去除率。顆粒滯流時間分別為：4〜141min，能縮短各操作條件，若小於90 min時，出流水質仍能維持50〜88％濁度去除效率，出流水質最佳可下降至530 NTU；平均流速大多數符合長方形沉澱池操作範疇，去除率為61％〜93％，出流水濁度為1,000 NTU以下，最佳可達380 NTU；符合傾斜管沉澱池操作範疇有3項，去除率為54％〜72％，出流水濁度為1,000〜1,650 NTU；可超越傾斜管沉澱池操作範疇有1項，進、出流水濁度為3,800下降至1,900 NTU，去除率為50％。高濁度原水體內具有大顆粒物資，易經長路徑而重力沉降。例如：進流水濁度為4,300〜5,300 NTU，經前處理實驗後出流水濁度為920〜750 NTU，去除率卻反而高達79〜86％。
另於粒徑分析項目中，高濁度原水粒徑D98概略為100〜125 μm之間，經由以阻隔板前處理後，各出流水水質於＜D6時粒徑為0.54〜1.84 μm之間，與進流水相差不多；＜D10時粒徑為0.73〜2.13 μm之間，但隨累積粒徑百分比增加，D98粒徑各出流水均可＜25 μm，其中低流量（8 ml/s）時D98粒徑各出流水均可＜10 μm。進流原水懸浮固體概略為5,000〜9,000 mg/l之間，經由阻隔板曲折繞流，水體途徑延長，操作處理流量減少，水體沉降時間延長，去除率可由70％左右逐漸提高至90％以上，出流水懸浮固體亦逐漸下降，大部份出流水可降至800 mg/l以下，8 ml/s最低約為100〜400 mg/l。再配合溢流高度增高，最佳可達110 mg/l。
因此，探討處理高濁度原水，使於降雨於時，仍能維持正常更供應水量，乃為努力目標。以無添加化學藥劑之物理處理方式，且於節省空間下，能預處理高濁度水質，降低原水濁度使其能達到操作負荷，減緩各淨水單元衝擊，維持正常供水之水量及水質，或能提高後續處理效率。

Due to the difficulty of conserving the water and soil of the hillside land in the Catchment Basin Area, it tends to produce high-turbidity raw water during the initial period of typhoons or storms and affect the operation of the purifying system. The turbidity of high-turbidity water can be reduced by means of an inertia restrained flow, extending the flowing route and heightening the overflow level; thus, allowing the impurities to settle by themselves through gravity and then be removed.
In this Research, the raw water presenting varied turbidity levels was sampled from different depths under the water surface to simulate the change of the water quality. During the research, a Barrier Board was used to extend the flowing route and the level change of the overflow; further, varied flow rates were also employed to carry out the pre-treatment of high-turbidity raw water in order to study the changes of turbidity,particle size and suspended solids of the influent and effluent water, with the settled bottom mud surveyed, the operating requirements of the Surface Overflow Rate (SOR), particle detention time, and the average flowing speed analyzed as well for comparing the removal effect with that in the physical field.
The experiment results indicated that the turbidity of the high-turbidity influent raw water was between 1,500~5,500 NTU, with a flow rate designed at below 8, 17, 50 and 100 ml/s. When treating the igh-turbidity raw water with a barrier board, the majority of the effluent water was between 100~1,000 NTU, exhibiting an over 50% removal rate, which even reached 70~90% and over 90%; and the turbidity of the effluent water could be reduced to 380 NTU at its least. When the SOR of the sedimentation basin is set at 19.l m/d, a 54~86% turbidity removal rate can be achieved; whereas, a 50~72% removal rate can be achieved when set at 38.3 m/ d. The particle detention time is as follows: At 4~141 min, the operating time can be shortened; when this is less than 90 min, the effluent still can maintain a 50~88% turbidity removal rate and the water quality of the effluent can even drop to 530 NTU. During the test, most of the average flowing speed was within the operating scope of the rectangular sedimentation basin for which the removal rate was 61%~93% and the effluent turbidity was below 1,000 NTU and even up to the optimal 380 NTU. A total of 3 items meet the operating requirements of the inclinometer sedimentation basin, presenting a 54%~72% removal rate and 1,000~1,650 NTU of effluent turbidity; and one item exceeds the operating requirements of the inclinometer sedimentation basin, presenting a lowered 1,900 NTU of effluent turbidity from 3,800 NTU and a 50% removal rate. Large-size particles exist in the high-turbidity raw water, which tends to settle under the gravity effect during after a long-route flowing journey. For example, the turbidity of the influent is 4,300~5,300 NTU which was reduced to 920~750 NTU after the pre-treatment experiment presenting a 79~86% or higher removal rate.
In respect to particle size analysis, the particle size (D98) of the high-turbidity raw water was roughly between 100~125 μm; after the pre-treatment with the barrier board, the particle size at ＜D10 was between 0.73~2.13 μm. With the increase of accumulated particle size percentage, the effluent water was able to reach <25 μm at D98 of particle size under the low rate (8 ml/s), the effluent water D98 was able to reach <10 μm. Raw water suspended solids roughly to 5,000-9,000 mg/l, the removal rate can be to about 70%-90 %, and reduced to 800 mg/l or less, 8 ml/s minimum about 100-400 mg/l, and then meet the overflow height increased, the best up to about 110 mg/l.
Aiming to accomplish this, the treatment of high-turbidity raw water was studied in the hope that a normal water supply could be maintained during the rainy season. By doing so, a physical treatment method without any chemical agent will be employed, while saving space requirements, the high-turbidity raw water can be treated in advance to reduce its turbidity so as to achieve the planned operating load, mitigate the impact to the respective water purifying facility, and maintain a normal water supply and water quality while enhancing the efficiency of the subsequent treatment.

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