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It is desired to remove benzene from an aqueous waste stream at an industrial waste site that produces approximately 20,000 gallons of water per day with a pH of 5.3 and a benzene concentration of 2000μg/L. A batch adsorption system is to be used. A preliminary bench scale analysis was conducted to get the adsorption data of benzene on two types of carbons (I and II) at pH 5.3. The data are given below:
(i) Which isotherm (Freundlich or Langmuir) would better represent the data?
(ii) What is the maximum adsorption capacity of carbon I and II?
(iii) If the effluent water quality for benzene is 20μg/L, how much of carbon would be required per day? Which carbon type would you recommend?
Suppose David spends his income (I) on two goods, x and y, whose market prices are px and py, respectively. His preferences are represented by the utility function u(x; y) = lnx + 2lny (MUx = 1=x;MUy = 2=y). a. Derive his demand functions for x and..
Why is the fact that stock prices follow a random walk a signal of stock market efficiency? What would have to be true if stock prices did not follow a random walk?
Suppose the demand curves for the two market segments are: Out of town: Q0 = 600 - 10P Local: Q1 = 600 - 20P A. If the resort charges one price to all skiers, what is the profit-maximizing price Calculate how many lift tickets will be sold to each..
At work one day Erica received 36 packages. Speedy delivered 3 times as many as Express, While Express delivered 4 more than Quick Service. How many packages did each service deliver to Erica?
Describe the factors that the auditors should consider in evaluating oral evidence provided by client officers and employees.
Find the present worth (present cost) of a simple maufracturing project where the initial investment is $413,000 and the cost of operation is $32,300 per year, inceasing by $4,000 per year (arithmetic gradient) beginning at the end of the third ye..
A firm is considering the purchase of a machine with a price tag of $ 18,500. The firm is able to make a down payment of 3,500 and the balance is to be financed with a bank credit at an interest rate of 9.25% compounded daily.
Snow goose feeding trial. Writing in the Journal of Applied Ecology (Vol. 32, 1995), botanists used multiple regression to model the weight change (y) of a baby snow goose subjected to a feeding trial. Three independent variables measured are list..
It is Sarah's 21st birthday today and she has received an inheritance of $50,000 from her grandfather. Sarah will spend one-half of this inheritance, and use the rest to start a retirement savings fund.
Kennedy Air Services is now in the final year of a project. The equipment originally cost $24 million, of which 65% has been depreciated. Kennedy can sell the used equipment today for $6 million, and its tax rate is 35%. What is the equipment's af..
If these expansions in the money supply happen, what effect will it have on aggregate demand, GDP, and employment?
You open a savings account to save for a new house. Everymonth you put $100 into a savings account which pays 5% interestcompounded monthly. At the end of each year you receive a $500bonus which you place directly into your "housefund".
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