Nester's Microbiology: A Human Perspective

Denise Anderson, Sarah Salm, Deborah Allen

Chapter 29

Environmental Microbiology: Treatment of Water, Wastes, and Polluted Habitats - all with Video Answers

Educators

Chapter Questions

Problem 1

A marked decrease in BOD during secondary treatment indicates
a) lack of $\mathrm{O}_{2}$ during treatment.
b) effective aerobic decomposition during treatment.
c) effective anaerobic decomposition during treatment.
d) removal of all pathogenic bacteria.
e) removal of all toxic chemicals.

Joanna Quigley

Joanna Quigley

Numerade Educator

Problem 2

Advanced treatment is often designed to remove
a) BOD.
b) nitrates and phosphates.
c) bacteria.
d) protozoa
e) methane.

Joanna Quigley

Numerade Educator

Problem 3

Which of the following is not a matching pair?
a) Potable water-presence of pathogens
b) High BOD - high organic content
c) Stabilized sludge-fertilizer
d) Primary treatment-removal of material that settles
e) Bulking- growth of filamentous bacteria

Joanna Quigley

Numerade Educator

Problem 4

Which of the following is false?
a) Bulking interferes with trickling filter systems.
b) Artificial wetlands provide a habitat for wildlife.
c) Removal of nitrates by microorganisms requires anacrobic conditions.
d) Methane is a by-product of anaerobic digestion.
e) Ozone can be used to disinfect water.

Joanna Quigley

Numerade Educator

Problem 5

Which of the following is not a matching pair?
a) Surface water - watershed
b) Groundwater-aquifer
c) Sand and gravel filters - removes organic chemicals
d) Alum-causes suspended material to coagulate
e) Disinfection-chlorine or ultraviolet light

Joanna Quigley

Numerade Educator

Problem 6

Septic tanks should be placed
a) as close to the well as possible.
b) near a lagoon.
c) under the house.
d) in deep clay soil.
e) where the outflow cannot contaminate any water supply.

Joanna Quigley

Numerade Educator

Problem 7

Which of the following about coliform testing methods is true?
a) All determine the number of $E$ coli present in a sample.
b) The MPN procedure precisely indicates the concentration of coliforms.
c) The media used in these tests checks for the ability to ferment lactose.
d) A positive test indicates that pathogens are definitely present in the sample.
e) All coliforms hydrolyze ONPG and MUG.

Joanna Quigley

Numerade Educator

Problem 8

Landfills are often used to dispose of
a) household wastewater.
b) commercial wastewater.
c) solid wastes.
d) petroleum wastes.
e) wastewater effluent.

Joanna Quigley

Numerade Educator

Problem 9

Backyard composting is an excellent way to dispose of
a) cooking fats.
b) garden debris.
c) spoiled meats.
d) insecticides.
e) cleaning supplies.

Joanna Quigley

Numerade Educator

Problem 10

Synthetic compounds are most likely to be biodegradable if they
a) are totally different from anything found in nature.
b) have three chlorine atoms per molecule.
c) are plastics.
d) are present in very large amounts.
e) are chemically similar to naturally occurring substances.

Joanna Quigley

Numerade Educator