Wastewater Treatment

Question 1

Tertiary treatments to further reduce nutrients from effluent

Answer 1

Biological nutrient removal, biological nitrogen removal, enhanced nutrient removal, enhance nitrogen removal

Question 2

How does the secondary treatment remove contaminants?

Answer 2

Removal of biodegradable organic matter
Microorganisms
Chemicals
physical methods to separate sludge

Question 3

Three stages of wastewater treatment process

Answer 3

Primary- separates solids from liquids (creates sludge)
Secondary- biofiltration (sand filters); aeration; oxidation ponds ➡️ aerobic respiration
Tertiary- removal of pathogens

Question 4

5 main steps in the drinking water purification process

Answer 4

Aeration ➡️ adds air to push out other trapped gasses & add O2
coagulation ➡️ chemicals like alum added to cause carbonates and hydroxide to stick together with dirt/particles
sedimentation ➡️ heavy particles sink and are removed
filtration ➡️ small, charcoal, gravel
disinfection ➡️ chlorine added to kill microorganisms

Question 5

Aeration

Answer 5

adds air to push out other trapped gasses & add O2

Question 6

coagulation

Answer 6

chemicals like alum added to cause carbonates and hydroxide to stick together with dirt/particles

Question 7

sedimentation

Answer 7

heavy particles sink and are removed

Question 8

filtration

Answer 8

small, charcoal, gravel

Question 9

disinfection

Answer 9

chlorine added to kill microorganisms