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13 Cards in this Set
- Front
- Back
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There are many potential safety hazards around a wastewater treatment plant. T or F |
True |
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Always wash your hands thoroughly before eating, smoking, or going home. T or F |
True |
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Stand on a slippery surface while raking material from a bar screen. T or F |
False |
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Storms or sewer cleaning operations by maintenance crews may cause a sudden surge of wastewater and debris and a resultant greater head loss through the screens. T or F |
True |
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The totalizer records the total volume of screenings removed by the plant. T or F |
False |
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When starting up comminutors and barminutors, always observe the unit to verify that it sounds normal and appears to be operating properly. T or F |
True |
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When estimating the velocity in a grit channel using a stick or other float, the average velocity in the channel will be slightly higher than estimate. T or F |
False |
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A little organic matter in the grit removed from a grit channel usually indicates that proper velocities are being maintained in the channel. T or F |
False |
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Treat an empty grit washer as a confined space and provide adequate ventilation. T or F |
True |
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Advance preparation for emergencies can save a lot of extra work and make it possible to keep your plant operating efficiently under unfavorable conditions. T or F |
True |
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Which problem is created by a treatment plant operating at reduced efficiency? 1. A decrease in chlorine dose requirements 2. A decrease in operator O & M requirements 3. An increase in the paperwork required to document the change 4. An increase in the pollution level of the effluent discharged into receiving waters |
An increase in the pollution level of the effluent discharged into receiving waters |
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What is the purpose of screens, racks, comminutors, and grit removal devices? 1. To biologically degrade or stabilize the wastewater 2. To control flow through the preliminary treatment processes 3. To disinfect the wastewater 4. To remove rocks, large debris, and grit |
to remove rocks, large debris, and grit |
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Which injuries can occur from pulling too hard when lifting inlet or outlet gates or pulling heavy, waterlogged debris from the racks? 1. Back injuries, Hernias, and muscles strains 2. Falling objects striking your head and hands 3. Heart attacks and strokes 4. Shortness of breath and heat exhaustion |
Back injuries, hernias, and muscles strains |
