Wastewater Exam Class C

Granular HTH is explosive or flammable when mixed with what? {Ans: Petroleum products}During start up your aeration tank produces excessive amounts of billowing white foam. This can be corrected by: A. Doing nothing, it will go away in a few hours B. Increasing the sludge wasting rate C. Seeding the process with sufficient good quality sludge D. Spraying water on the foam until it is gone E. Taking a weeks vacation {Ans: C. Seeding the process with sufficient good quality sludge}Using alternating controls on lift pumps allows the operator to {Ans: Evenly wear pumps so they are ready for use.}Carbon Dixoide is hazrdous in a closed environment In an activated sludge plant this could {Ans: Makes up 3-4% of normal sludge gas}Which of the following would you use to increase the degree of nitrification in an activated sludge plant? A. increase the wast rates B. increase dissolved oxygen levels and increase the sludge age C. Remove excess alkalinity from the wastewater D. Maintain a thicker sludge blanket n the clarifier E. Inhibit the growth of the nitrifying bacteria with chemicals. {Ans: B. increase dissolved oxygen levels and increase the sludge age}What hazards would you find