ENVENG 3200 Exam 2 Practice Questions and Answers | Environmental
Engineering Review Guide
oxygen demand - ANS ✔✔property of a waste that relates the depletion of oxygen to the
amount of waste
exponential growth - ANS ✔✔xt=x0e^(umax-kd)t, 1st order growth
logistic growth - ANS ✔✔xt=1+k/[(k-x0)/x0)e^-(umax-kd)t], a limit called carrying capacity
Diffusion - ANS ✔✔the process by which molecules move from an area of higher concentration
to an area of lower concentration, molecular motion
Dispersion - ANS ✔✔the process by which molecules move from an area of higher
concentration to an area of lower concentration, fluid motion
Yield Coefficient - ANS ✔✔increase in population/change in substrate
Anaerobic - ANS ✔✔without oxygen
Depleted Oxygen, Facilitative - ANS ✔✔can utilize O2 and other electron acceptors
Depleted Oxygen, Strict or Obligate - ANS ✔✔can only use one electron acceptor
THOD - ANS ✔✔Theoretical Oxygen Demand
CBOD> - ANS ✔✔BOD
, THOD> - ANS ✔✔COD
THOD>NBOD - ANS ✔✔
CBOD Rate Coefficient - ANS ✔✔for graphs, as kL increases, CBOD exerted increases
leading to the amount of CBOD remaining decreasing
Surface water - ANS ✔✔easy to contaminate, high in suspended solids, flows are variable and
can dry up
groundwater - ANS ✔✔high in dissolved solids, flows are low, difficult to clean up, recharge can
be an issue
seawater - ANS ✔✔very costly, generates a lot of waste, is the last resort
reclaimed water - ANS ✔✔Treated wastewater, limited use due to social acceptance
Water Usage - ANS ✔✔8 countries consume half of the worlds water
1.China
2.India
3.United States
4.Indonesia
5.Brazil
6.Pakistan
7.Nigeria
8.Russia
Engineering Review Guide
oxygen demand - ANS ✔✔property of a waste that relates the depletion of oxygen to the
amount of waste
exponential growth - ANS ✔✔xt=x0e^(umax-kd)t, 1st order growth
logistic growth - ANS ✔✔xt=1+k/[(k-x0)/x0)e^-(umax-kd)t], a limit called carrying capacity
Diffusion - ANS ✔✔the process by which molecules move from an area of higher concentration
to an area of lower concentration, molecular motion
Dispersion - ANS ✔✔the process by which molecules move from an area of higher
concentration to an area of lower concentration, fluid motion
Yield Coefficient - ANS ✔✔increase in population/change in substrate
Anaerobic - ANS ✔✔without oxygen
Depleted Oxygen, Facilitative - ANS ✔✔can utilize O2 and other electron acceptors
Depleted Oxygen, Strict or Obligate - ANS ✔✔can only use one electron acceptor
THOD - ANS ✔✔Theoretical Oxygen Demand
CBOD> - ANS ✔✔BOD
, THOD> - ANS ✔✔COD
THOD>NBOD - ANS ✔✔
CBOD Rate Coefficient - ANS ✔✔for graphs, as kL increases, CBOD exerted increases
leading to the amount of CBOD remaining decreasing
Surface water - ANS ✔✔easy to contaminate, high in suspended solids, flows are variable and
can dry up
groundwater - ANS ✔✔high in dissolved solids, flows are low, difficult to clean up, recharge can
be an issue
seawater - ANS ✔✔very costly, generates a lot of waste, is the last resort
reclaimed water - ANS ✔✔Treated wastewater, limited use due to social acceptance
Water Usage - ANS ✔✔8 countries consume half of the worlds water
1.China
2.India
3.United States
4.Indonesia
5.Brazil
6.Pakistan
7.Nigeria
8.Russia
