Texas Wastewater Class A Exam Questions And Answers 100% Correct

67. The major cause of wastewater line stoppages is {Ans: roots and grease}If an operations company ceases its operation or is sold such that control of the company is transferred to another party, {Ans: the company's operations certificate is revoked}Why is recirculation needed in a trickling filter? {Ans: a. Keep the media wet b. Further reduce BOD c. Flood the filter to control ponding and filter flies}27. A complete mix activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the clarifier. One method of correcting the problem is to {Ans: Increase F/M ratio by wasting more}A one-cylinder reciprocating sludge pump with a 10-inch bore and a 5-inch stroke pumps at rate of 50 cycles per minute. How many minutes must the pump be operated to pump 5,000 gallons of sludge? {Ans: 3.14 x0.416 x0.416 x0.416 x 50x7.48 = 84.5 gpm 5000 gal = 59.2min 84.5 gpm d. 60 minutes e.}Approved backflow devices in Texas include: {Ans: air gap of two times the inlet pipe diameter testable assemblies usually an RPZ}