What kind of pollution can be traced to a specific origin?

• Point source pollution

• Non-point source pollution

• Focused point pollution

• Cumulative pollution

Which of the following is an example of a non-point pollution source? (You may choose more than one answer.)

• urban run-off

• factory discharge

• agricultural irrigation

• eroding streambanks

Which water pollutant is the main reason behind eutrophication of lakes and estuaries and high biological oxygen demand (BOD)?

• inorganic chemicals

• thermal pollution

• sewage

• eroded sediment

Which of the following water sources has the best chance of recovery from the effects of water pollution ?

• lake

• groundwater

• river

In the Philippines, which is the major source of water pollution?

• industrial wastewater

• agricultural run-off

• deforestation

• untreated sewage

In the treatment of drinking water, which of the following is a chemical treatment process?

• aeration

• sedimentation

• coagulation

• filtration

In the treatment of drinking water, this initial process removes objects such as rags, paper, plastics, and metals to prevent damage and clogging of downstream equipment and piping.

• screening

• flocculation

• reverse osmosis

• flotation

In municipal sewage treatment, __________ treatment removes suspended and floating particles using mechanical processes.

The solid left after the treatment of sewage is called __________.

Which of the following is/are true?

• Drinking water needs to comply with national standards for safety.

• Treated sewage water does not have to comply with national standards before release back into a water body.

• All physical and chemical changes in a body of water is considered pollution.