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(p) Three biological processes of anaerobic digestion are? i) Coagulation, Acidogenesis, Methanogenesis ii) Hydrolysis, Acidogenesis, Disinfection iii) Hydrolysis, Photosynthesis, Disinfection IV) Hydrolysis, Acidogenesis, Methanogenesis 1. Which of the following treatment devices is commonly used to separate and remove large solids form raw wastewater? a. A Mechanically raked bar screen b. A Grease Trap c. A Primary Clarifier 2. Pre-treatment of wastewater would include- a. Coarse or Fine Screening b. Grinding and Grit Removal c. Grease Removal and Pre-aeration d. Adding Chlorine e. a, b, &c 3. Primary treatment of wastewater would include- a. Settling tanks or basins b. Scum collection & removal c. Sludge collection & removal d. Chlorination e. a, b, &c Grit removal would be considered - a. A part of the Pre-treatment b. A part of Secondary Treatment c. Overrated and is not cost effective to perform d. Job duties for the beginning operator 5. Secondary treatment typically used today would include- a. Rotating Biological Contactors (RBC), b. Facultative Lagoons 4.
14. In the activated sludge process, as more mixed liquor flows to the clarifier, the thickness of the sludge will a. Increase as solids accumulate b. Decrease as solids are used c. Stay constant 15. In the activated sludge process, no sludge process will work properly without - a. Regular injection of fresh enzymes to keep the process functioning b. Regularly dewatering the sludge blanket c. Periodically lowering the telescoping valve to get rid of suspended particles. d. Aerating the solids that are being recycled 16. In the activated sludge process, Mass Balance refers to a. Maintaining the balance between Return Sludge Flow, Return Sludge, Aeration tank volume, Mixed liquor suspended solids b. Maintaining the balance between Returned sludge flow and the total amount of chemicals used monthly c. Maintaining the balance between in-flow and sludge waste outflow d. Maintaining the microorganisms in the aeration basin e. Mass Balance has nothing to do with the activated sludge process 17. In the activated sludge process, the term Mean Cell Residence Time (MCRT) refers to - a. The longer a cell is kept in the aeration the more resistant it becomes b. The number of times that a living cell is circulated c. The amount of time the living cells are kept in the plant d. The amount of time that it takes to draw sludge to a drying bed c. The amount of time that it takes from raw sludge entering the plant to processed sludge being wasted to dewatering. .