Wastewater Treatment B Test Exam Questions and Answers, Exams of Water and Wastewater Engineering

Download Wastewater Treatment B Test Exam Questions and Answers and more Exams Water and Wastewater Engineering in PDF only on Docsity! The Wastewater Treatment B Test Exam Questions and Answers Lift stations at a treatment plant or those which discharge directly to a treatment plant with an average flow greater than 0.1 MGD shall have three or more pumps or have automatically controlled variable capacity pumps, these pumps should be adjusted to actual flow conditions and controlled to operate so as to: - Correct answer Minimize surges in the treatment in the treatment units. In the contact stabilization system of activated sludge treatment, the detention time in the contact zone is designed be _______ other types of activated sludge treatment. - Correct answer shorter than According to current TCEQ wastewater operator certification rules, an operator can renew a Class D Wastewater Treatment Plant Operator if he or she: A) Works only in a collection system B) Is an operator at an activated sludge plant? C) Is an operator at a trickling filter treatment facility with a permitted daily average flow of 0.15 MGD? D) Both A and C. E) None of the above - Correct answer none of the above If a Leak is suspected in an off-line, back-up, one-ton chlorine cylinder, after putting on proper safety equipment, the operator should first: - Correct answer Call appropriate emergency response personnel. The definition of an oxygen-deficient atmosphere is one that contains less than ________ percent oxygen. - Correct answer 19.5 A combustible atmosphere: - Correct answer contains oxygen and flammable gas, vapor, or dust All of the following EXCEPT ________ are damaging or irritating to the mucus membranes or lungs if inhaled: A) Ozone B) Lime Dust C) Chlorine Gas D) Carbon Dioxide E) Ferric Chloride Dust - Correct answer Ozone The Sludge Volume Index (SVI) is: - Correct answer the volume of settled sludge (30-minutes) in ml/L times 1000, divided by the concentration in mg/L of MLSS. P a g e 1 | 5 Bio monitoring - Correct answer involves the use of aquatic life to test the toxicity of a wastewater treatment plant effluent. A 24-Hour composite sample was tested for chlorine residual and found to contain none. These results indicate that: - Correct answer Residual chlorine was NOT present during the 24-hour period. In an activated sludge treatment plant, the 30 minute settle ability test indicates: A) The clarity of the effluent B) The influence of surface tension settling C) The current settling capabilities in the clarifier D) The ability of the organisms to flocculate and settle. E) All of the above - Correct answer E) All of the above Setting work goals for an individual works best - Correct answer Accompanied by an action plan One element of being an effective communicator is to: - Correct answer be a good listener An efficient primary clarifier is expected to remove _______ of the influent, settable solids. - Correct answer 90 percent or better Primary wastewater treatment facilities make use of - Correct answer the force of gravity and density differences between the water and the solids. If the inside diameter of the lift station wet well is 8 feet, and the vertical separation between "lead pump on" and "all pumps off" (low water line) is 4 feet 9 inches, the approximate storage in the wet well during a normal pump cycle is: - Correct answer 1,785 gallons Assume that both pumps shown in the exhibit are working. The function of float switch B is to turn: - Correct answer the lead pump on The extent of treatment necessary at a particular wastewater treatment plant depends upon: A) The treatment plant location B) Water quality standards set for the receiving stream C) Amount and final use of the treatment plant effluent D) The type and concentration of wastes received at the plant for treatment. E) All of the above - Correct answer All of the above In most pressure sewer systems, the plumbing units or grinder pumps at each residence are considered to be - Correct answer the integral part of the wastewater collection system Assume that a pumping unit with a 14 3/4 inch impeller has characteristics as described by the pump curve shown in the exhibit. If the pumping unit is working against a static head of 47 feet, P a g e 2 | 5