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25 Cards in this Set
- Front
- Back
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All organic materials have one thing in common- they all contain basic minerals. T or F |
False |
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Most living creatures need oxygen to survive, including fish and other aquatic life. T or F |
True |
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Initial efforts to control human wastes evolved from the need to prevent the spread of diseases. T or F |
False |
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The bacteria that grow in the intestinal tract of diseased humans find the environment in the wastewater treatment plant or receiving waters favorable for their growth and reproduction. T or F |
True |
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One of the primary functions of a treatment plant is the removal of solids from wastewater. T or F |
True |
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Operators try to kill or inactivate pathogenic organism by disinfection. T or F |
True |
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The weight of nonsettleable solids may be calculated by subtracting the weight of dissolved and total solids from the weight of settleable solids. T or F |
False |
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The organic portion of the total solids can be very harmful to receiving waters. T or F |
False |
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Operators should use a standard method for the measurement and evaluation of floatable solids. T or F |
False |
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Nutrient cycles are very complex and involve chemical changes in living organisms. T or F |
True |
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What is the definition of pollution? 1. Any discharge of waste to a body of water 2. Any interference with the beneficial reuse of water 3. Any substance that is toxic or hazardous 4. Anything that is oborous or unsightly |
Any interference with the benficial |
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What is an organic waste? 1. Waste material such as sand, salt, iron, or calcium 2. Waste material that may come from animal or plant sources 3. Wastes that could come from hospitals, research laboratories and nuclear power plants 4. Wastewaters that may come from cooling processes used by industry |
Waste material that may come from animal or plant sources |
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What is an inorganic waste? 1. Waste materiall suck as sand, salt, iron, or calcium 2. Waste material that may come from animal or plant sources 3. Wastes that could come from hospitals, research laboratories, and nuclear power plants 4. Wastewaters that may come from cooling processes used by industry
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Waste material such as sand, salt, iron, or calcium |
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What happens to fish in receiving waters when bacteria use the entire supply of oxygen from the stream faster than it can be replenished by natural diffusion from the atmosphere? 1. They become agitated 2. They die 3. The feed 4. They reproduce |
They die |
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The stabilization of a waste means which of the following? 1. To convert the waste to a form that resists change 2. To flatten the waste 3. To remove all food for bacteria 4. To shrink the waste |
To convert the waste to a form that resist change |
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Many serious outbreaks of communicable diseases have been traced to which problems? 1. Direct contamination of drinking water or food supplies by the body wastes from a human disease carrier 2. Lack of personal hygiene in public schools 3. Leachate from sanitary landfills and municipal garbage dumps 4. Poor sanitation in fast-food resturants |
Direct contamination of drinking water or food supplies by the body wastes from a human disease carrier |
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What is an operator's best defense against infections and disease? 1. Good personal hygiene 2. Personal protective equipment 3. Regular physical examinations 4. Use of detergents |
Good personal hygiene |
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What is the objection to treated wastewaters containing nutrients? 1. Nutrients act as fertilizer in crop irrigation water 2. Nutrients are capable of encouraging excess algae and plant growth in receiving waters 3. Nutrients create extreme pH levels 4. Nutrients produce tastes and odors in drinking water |
Nutrients are capable of encouraging excess algae and plant growth in receiving waters |
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Why are floatable solids undesirable in the plant effluent? 1. Color of floatables presents a colorful appearance 2. Floatables tend to cause tastes in fish 3. Odors produced by floatables smell like rotten eggs 4. The sight of floatables in receiving waters indicates the presence of inadequately treated wastewater |
The sight of floatables in receiving waters indicates the presence of inadequately treated wastewater |
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Why are ammonia and hydrogen sulfide undesirable in receiving waters? 1. They are difficult gases to capture and contain 2. They are indicative of poor maintenance 3. They are odorous gases 4. They represent the loss of a valuable resource |
They are odorous gases |
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Substantial amounts of organic industrial waste come from which industries? 1.Dairy processing 2.Meat packing 3.Mining 4. Tanning 5. Vegetable and fruit packing |
1, 2, 4, 5 |
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Waste discharges may contain what types of toxic substances? 1. Chlorine residual 2. Cyanide 3. Hardness 4. Heavy metals 5. Taste- and odor-producing substances |
1, 2, 4, 5 |
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Which substances are objectionable in treated wastewater discharges? 1. Color-producing substances 2. Highly acid or alkaline (basic) substances 3. Pathogenic organisms 4. Taste- and odor-producing substances 5. Toxic substances |
all choices |
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Wheather any problems are caused by the discharge of treated wastewater in the receiving waters depends on which factors? 1. Amount of flow in the receiving stream or volume of receiving lake that can be used for dilution 2. Quality of the receiving waters 3. Size of flow from the treatment plant 4. Type or degree of treatment 5. Uses of the receiving waters |
all choices |
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Why do operators need to know how to control nutrient cycles? 1. To conserve water 2. To control odors 3. To generate energy efficient systems 4. To protect receiving waters 5. To treat wastes |
2, 4, 5 |
