One of the most important, and most difficult processes in wastewater treatment.

It occurs when large quantities of organic compounds, which act as substrates for microorganisms, are released into watercourses.

Which of the following are NOT included in the four zones of stream self-purification? Choose 2.

It is used as a solid-removal operation in water and the most common filter material used is a granular medium similar to a sand and gravel encountered in many streams and aquifers.

It happens when the presence of sunlight, algae metabolize inorganic compounds, producing oxygen as one of the waste products.

Sludge worms are single-cell organisms that are reproduced by binary fission.

Which of the following are the main sources of Metro Manila's water supply. Choose 3.

These are autotrophic, photosynthetic organisms which metabolize the waste product of heterotrophic bacteria while obtaining energy from sunlight.

What processes are shown in the figure?

The upper layer of warm, circulating

water is known as epilimnion.

It is considered the most economical means of wastewater disposal and was considered a good engineering practice.

One of the most important constituents of natural water systems.

The sum total of the

processes by which living organisms assimilate and use food for subsistence growth and reproduction.