lecture 3

Question 1

microorganisms are the….

Answer 1

principle recyclers of biomass

Question 2

microbes

Answer 2

turnover carbon and other nutrients

Question 3

main objectives of wastewater treatments

Answer 3

1. kill any pathogens that may be present

2. reduce organic, nitrogen and phosphorous load

Question 4

BOD

Answer 4

biochemical oxygen demand

relative amount of dissolved oxygen consumed by microbes to aerobically decompose organic material in a water sample

Question 5

environmental hypoxia

Answer 5

1. cutoff salty water from air
2. algal blooms use up oxygen in lower levels cutoff oxygen lower layers
3. starved of oxygen marine hypoxia dead zones

Question 6

wastewater treatment

Answer 6

primary (physical)
secondary (biological)
tertiary (chemical)

Question 7

primary physical treatment

Answer 7

60% contaminants removed
reduction in coliforms
screen indestructibles, sedimentation tanks sludge

Question 8

secondary biological treatment

Answer 8

involves microorganisms
95% of contaminants removed
removes carbon by injecting oxygen aeration
creates sludge and liquid

Question 9

tertiary treatment

Answer 9

UV chlorination, ozone disinfectant

Question 10

biogas as a household fuel

Answer 10

fueled by human and animal waste

methane release- resource

Question 11

create synthetic life for bioremediation

Answer 11

clean up of toxic wastes using microbes to cure environmental contaminants