TEXT PROBLEMS 3-1 TO 3-4 WITH WORK PLEASE

6.3 An activated sludge tank, 30 x 30 x 200 ft, is designed as a plug-flow reactor, with an influent BOD of 200 mg/L and a flow rate of 1 mgd. a. If BOD removal is a first-order reaction, and the rate constant is 2.5 days-7, what is the effluent BOD concentration? 3. Text Problem 6-3 3-1. What is the effluent BOD concentration? (10 pts) a. 200 mg/L C. 14 mg/L b. 7 mg/L d. 193 mg/L 3-2.If the same system operates as a completely mixed flow reactor, what must its volume be (for the same BOD reaction)? (5 pts) a. 1.35 x 106 gal C. 18 x 104 gal b. 11.4 x 106 gal d. 1x 106 gal 3-3.How much bigger is this, as a percent of the plug flow volume? (5 pts) a. 844% larger C. 11.8% larger b. 740% larger d. 88.16% larger 3-4. How many? (n=?) (10pts) a. 1 C. 3 b. 2 d. 4