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25 Cards in this Set

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  • Back

All organic materials have one thing in common- they all contain basic minerals. T or F

False

Most living creatures need oxygen to survive, including fish and other aquatic life. T or F

True

Initial efforts to control human wastes evolved from the need to prevent the spread of diseases. T or F

False

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

One of the primary functions of a treatment plant is the removal of solids from wastewater. T or F

True

Operators try to kill or inactivate pathogenic organism by disinfection. T or F

True

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

The organic portion of the total solids can be very harmful to receiving waters. T or F

False

Operators should use a standard method for the measurement and evaluation of floatable solids. T or F

False

Nutrient cycles are very complex and involve chemical changes in living organisms. T or F

True

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

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

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


Waste material such as sand, salt, iron, or calcium

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

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

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

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

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

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

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

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

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

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

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

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