課程名稱︰環境工程一
課程性質︰系定必修
課程教師︰張尊國
開課學院：
開課系所︰生工系
考試日期（年月日）︰97/11/19
考試時限（分鐘）：約180分鐘
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
環境工程期中考試 試題 2008/11/19
1.試繪圖並說明混凝過程中界達電位(zeta potential)與膠體穩定之關係。混凝劑所扮演
之功能為何？常用之混凝劑有哪些？ 9%
2.Below is the process of a typical water treatment plant, please indicate
units 1-7 and describe function of every unit. 9%
1:混合池
2:膠凝池
3:沉澱池
4:砂濾池
5:加氯消毒
6:清水池
7:抽水機
3.For a flocculant suspension, determine the removal efficiency for a basin 9
ft deep with an overflow rate Vo equal to 8 ft/h, using the laboratory
settling data presented in the following table. 9%
───────────────────────────────────────
Percent suspended solids
removed at indicated depth (in ft)
───────────────────────────────
Time,min 2 4 6 8 10
───────────────────────────────────────
20 61
30 71 63 55
40 81 72 63 61 57
50 90 81 73 67 63
60 - 90 80 74 68
70 - - 86 80 75
80 - - - 86 81
───────────────────────────────────────
4.Consider a first -order reaction, requiring 60% reduction in the
concentration. Would a plug flow or a completely mixed flow resctor require
the least reactor volume? How about when the reduction required 90%? 9%
5.A radioactive nuclide is reduced by 93% in 12 minutes. What is its half-life?
9%
6.A municipal wastewater treatment plant discharges into a stream that at some
times of the year has no other flow. The characteristics of the waste are:
10%
Flow = 0.1 m^3/sec Dissolves oxygen = 6 mg/L Temperature = 18℃
K1 = 0.23 day^-1 Ultimate BOD (L) = 280 mg/L DOs @ 18℃ = 9.54 mg/L
The velocity in the stream is 0.5 m/sec and the reoxygenation constant K2 is
assumed to be 0.45 day^-1
A.Will the stream maintain a minimum 4 mg/L if there is no other flow in the
stream?
B.If there is stream water above the outfall and this water has a temperature
of 18℃ and no demand for oxygen and is saturated with DO, how great must
the upstream flow be to assure a minimum dissolved oxygen of 4 mg/L
downstream of the discharge?
7.a contaminant is removed by a first-order reaction (r =kC), with rate
loss
coefficient (k) of 0.24 hr^-1. Calculate the volume of a plug flow treatment
system needed to achieve a 80% reduction in contaminant if the flow rate in
the system is 0.002 m^3/s.
8.所謂折返加氯法並寫出過程中所有之化學反應，繪製之加氯量與餘氯量，圖中為何有一
段是朝下請說明。 9%
9.請說明濾床中之反沖洗順序。 9%
10.請導出顆粒沉澱之終端速度公式並說明在何種條件下可發展出Stoke's law? 9%
11.請說明沉澱池設計時溢流率 (overflow rate) 所代表的意義。 9%
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