sewage treatment

Question 1

what are the hazards of raw sewage (3)

Answer 1

typhoid
hepatitis
gastro enteritis

Question 2

what are the advantages of an stp (5)

Answer 2

reduce ships openings
simplify pipe runs
heads and bathrooms can be lower
ship can operate in anti pollution areas
easier to close down in cbrn conditions

Question 3

what are the forms of stp
(2)

Answer 3

biological
collect hold and transfer

Question 4

what are the 2 types of biological systems of stps
(2)

Answer 4

Aerobic and anaerobic

Question 5

what is aerobic digestion and hows it fed

Answer 5

air getting pumped into sewage and breaking it down
fed with air compressors

Question 6

cht systems (collect hold and transfer) can hold how many days of sewage (2)

Answer 6

12 days worth and the holding tanks can hold 24 hours worth

Question 7

what do ejectors do in collect hold and transfer systems (2)

Answer 7

move sewage between holding tanks to stop anaerobic digestion

Question 8

what do transfer pumps do (2)

Answer 8

transfers sewage from collection tanks to holding tanks or discharge overboard

Question 9

to rig up a vps system you need:
(4)

Answer 9

20 people
3 hours
run by whole me department
leader gas monitor needed

Question 10

what are the the hazards of operating sewage plants (3)

Answer 10

dangerous chemicals
raw sewage
dangerous gases- cholrine and methane

Question 11

what does hydrogen sulphide do at each ppm (3)

Answer 11

20-30ppm smells sweet
150-400ppm loss of smell and dizziness
1000ppm unconsciousness and death in seconds