Question 1

Which U.S. government agency monitors water utility reports?

Accepted Answer

The Environmental Protection Agency (EPA) is responsible for monitoring and regulating the quality of drinking water in the United States. This includes the oversight of water utility reports to ensure compliance with federal regulations. The Food and Drug Administration (FDA) primarily regulates food and drug products and does not have a role in monitoring water utilities. The Natural Resources Conservancy Commission and Water Safety Board are not actual government agencies.

Question 2

The purpose of amending anionic polymers in sedimentation basins is to

Accepted Answer

Anionic polymers are used to aid in the formation of sediment by aggregating and binding small particles together to form larger particles that can settle more easily. They do not catalyze reactions between chemical wastes and microbes or disperse digestive microbes.

Question 3

An untreated Entamoeba histolytica infection can invade (the)

Accepted Answer

An untreated Entamoeba histolytica infection can invade all of the above organs - the lungs, liver, and brain. The parasite can spread from the intestinal tract to other tissues and organs through the bloodstream, causing potentially severe and life-threatening complications.

Question 4

Cryptosporidium parvum oocysts are highly resistant to

Accepted Answer

Cryptosporidium parvum oocysts are highly resistant to chlorine, which makes them difficult to eliminate from water supplies using standard chlorination methods.

Question 5

Vibrio cholerae primarily infects the

Accepted Answer

Vibrio cholerae primarily infects the small intestine, where it produces toxins that cause severe diarrhea and can lead to dehydration and death if left untreated.

Question 6

What is the medium used in the membrane filter (MF) procedure to differentiate fecal coliforms and Escherichia coli?

Accepted Answer

Eosin-methylene blue (EMB) agar is a differential medium commonly used in the membrane filter procedure to differentiate fecal coliforms and E. coli. EMB agar contains dyes that inhibit the growth of gram-positive bacteria and allow for the detection of lactose fermentation. E. coli, which is a fecal coliform, will produce metallic green colonies on EMB agar due to its ability to ferment lactose and reduce the dyes in the medium. Other fecal coliforms will produce pink colonies on EMB agar. Thus, EMB agar is the best choice for differentiating fecal coliforms and E. coli in the MF procedure.

Question 7

During secondary aerobic wastewater treatment, some of the activated sludge goes________ while the rest goes________ .

Accepted Answer

During secondary aerobic wastewater treatment, some of the activated sludge goes back to the aerator to continue the treatment process, while the rest goes to the anoxic sludge digestor for further treatment. Therefore, the correct choice is A) back to the aerator/to the anoxic sludge digestor.

Question 8

Which product of anoxic sewage treatment can be used to heat and power an entire water treatment facility?

Accepted Answer

Methane (CH4) is the primary product of anoxic sewage treatment, which can be used as a fuel source to generate heat and electricity for the water treatment facility. This process is known as anaerobic digestion and is a sustainable way to produce energy while also treating wastewater. The other options, hydrogen (H2), oxygen (O2), and carbon dioxide (CO2), are also produced during anaerobic digestion but cannot be used in the same way as methane for heating and powering the facility.

Question 9

The most common route of transmission of Salmonella typhi worldwide is through

Accepted Answer

The answer of The most common route of transmission of...

Question 10

To reduce further the possibility of biological contamination, most treatment plants treat the effluent with

Accepted Answer

The answer of To reduce further the possibility of biological...

Question 11

Chlorine in water is extremely volatile, so ________is commonly added to chlorine- containing water to form a nonvolatile compound that serves as a primary disinfectant.

Accepted Answer

Ammonia can react with chlorine to form chloramine, which is a nonvolatile compound that serves as a primary disinfectant in water treatment. Calcium carbonate is not a disinfectant, nitric acid and fluorine are not commonly used in water treatment for disinfection purposes.

Question 12

The mechanical process by which debris is removed from industrial wastewater is called________.

Accepted Answer

The answer of The mechanical process by which debris is...

Question 13

In the developed countries of the world, most intestinal infections are transmitted via________.

Accepted Answer

The answer of In the developed countries of the world,...

Question 14

Complete wastewater treatment involves ________, ________, and ________treatments to remove or neutralize contaminants.

Accepted Answer

The answer of Complete wastewater treatment involves ________, ________, and...

Question 15

Tertiary treatment of wastewater is a _________ process.

Accepted Answer

Tertiary treatment of wastewater is a physicochemical process that involves the use of chemical and physical methods to remove any remaining contaminants from the water after the primary and secondary treatments have been completed. This includes processes such as filtration, disinfection, and chemical precipitation.

Question 16

Which of the following is NOT characteristic of a coliform?

Accepted Answer

Coliforms are known to ferment lactose with the formation of gas, not glucose.

Question 17

Treatment of water by chlorination serves two functions: (1)________ and (2) _________ .

Accepted Answer

The answer of Treatment of water by chlorination serves two...

Question 18

Giardia cysts are able to withstand

Accepted Answer

The answer of Giardia cysts are able to withstand
...

Question 19

Water leaving an efficient wastewater treatment facility ideally has a biochemical oxygen demand (BOD) between ________units.

Accepted Answer

An efficient wastewater treatment facility aims to reduce the BOD to between 0 and 5 units, indicating low levels of organic pollution and high water quality.

Question 20

Which of the following bacterial pathogens is found in both aquatic environments and is commonly present in air conditioning systems?

Accepted Answer

Legionella pneumophila is the only bacterial pathogen listed that is commonly found in both aquatic environments and air conditioning systems.

Quiz 35: Wastewater Treatment, Water Purification, and Waterborne Microbial Diseases