Exam 42: Applied Environmental Microbiology

Filamentous organisms such as Sphaerotilus and Thiothrix can lower the efficiency of activated sludge processes by causing

Chlorination alone will usually suffice to inactivate viruses present in drinking water.

Cryptosporidium is an important waterborne disease. This organism is a

Secondary treatment of sewage involves the use of which type of process?

Molecular techniques using 16S rRNA gene targeted primers are now used routinely to detect coliforms in water.

Potable water is unfit for consumption or recreation because of the high levels of microbial contaminants present.

In the total organic carbon (TOC) test, microorganisms are used to measure the levels of carbon in a water sample.

Rapid sand filtration, used in many water purification plants, is sufficient to ensure that Giardia will be consistently removed.

Removal of environmental pollutants using microorganisms is called __________.

Canada geese have become a major source of Giardia and Cryptosporidium contamination of soil and fresh water.

Sewage treatment that involves horizontal flow in an agitated aeration tank is referred to as

Indicator organisms are added to drinking water to test whether the purification process is being carried out effectively.

If a leach field floods it becomes anoxic and effective treatment ceases.

The presence-absence test is a modification of which test?

Coliforms and fecal coliform are often differentiated based on their responses to

Removal of 99% of the indicator organisms in drinking water will be sufficient to avoid disease transmission.

The biochemical oxygen demand (BOD) test is primarily a measure of carbon demand and should not include nitrogen oxidation demand.

Which of the following contributes to the removal of organic material in home sewage treatment system leach fields?

Methods used to remove or destroy viruses from drinking water include

The solubilization of metals from low-grade ores by microorganisms is called __________.