PDH Quiz - Disinfecting the Water using Combined Disinfectants

1.

Chlorine is the most commonly used disinfectant in the drinking water treatment industry.

True

False

2.

Maximum Contaminant Level Goals (MCLGs) are non-enforceable health goals for public water systems.

True

False

3.

_______________ represents the primary drinking water regulations related to microbiological contaminants.

Table 1-2

Table 1-3

4.

Most disinfectants are strong oxidants and/or generate oxidants as byproducts (such as hydroxyl free radicals) that react with organic and inorganic compounds in water.

True

False

5.

The high pH treatment during lime softening does not have any impact on chlorine, chloramines, and UV.

True

False

6.

______________________gives a summary of disinfectant properties.

Table 1-5

Table 1-6

7.

Trihalomethanes (THMs), other halogenated organics, ozone DBPs, oxidation byproducts, and some disinfectant residuals present a health risk and must be limited in drinking waters.

True

False

8.

The ________________________ used in a treatment system, with the primary objective of the disinfectant being to maintain the disinfection residual through the distribution system.

First disinfectant

Second disinfectant

9.

High bromide ion is defined as concentrations exceeding 0.10 mg/L.

True

False

10.

Figure 1-2 represents the _______________________________________________.

Flow Diagram to Narrow Selection of a New Primary Disinfectant

Flow Diagram to Narrow Selection of a New Secondary Disinfectant

11.

Assimilable organic carbon concentration is produced when a strong oxidant (e.g., ozone) is used as primary disinfectant in the presence of high TOC water.

True

False

12.

Primary Drinking Water Regulations Related to Disinfection Byproducts is represented in ______________.

Table 1-3

Table 1-4

Disinfecting the Water using Combined Disinfectants - Quiz

Quiz Question