Rural Sewage V2 Flashcards
What type of bacteria breaks down sewage into sludge, scum, and effluent?
Anaerobic
What type of bacteria thrives in warm, moist, dark environments void of fresh air?
Anaerobic
What is the recommended distance between the invert of the inlet fitting/baffle and the effluent filter/baffle?
Feet
What is the minimum recommended ground cover for insulation of a septic tank?
12 inches
What is the minimum distance from a building for a septic tank?
Feet
Is a septic tank considered a ‘confined space’ and must entry follow WCB procedures?
True
Does the septic process produce methane, hydrogen sulphide, and other gases?
True
What is the septic process also known as?
Decomposition
How often should a septic tank be pumped on average?
Every 3 years
Does the scum layer aid in heat retention?
True
How many gallons of sludge should a tank never be cleaned after pumping?
Max 3 gallons
What is the minimum ratio of width to length that promotes ‘quiescent’ flow?
Width to length ratio
Do inlet and outlet fittings promote ‘quiescent’ flow?
Yes
What is the minimum retention period for sewage treatment?
4 hours
Should there be a minimum of 12 inches of scum layer?
True
What is the minimum distance a septic tank should be located from a source of domestic water?
Should be located no closer than feet (|LM) from a source of domestic water.
Is the smallest tank allowed in BC 750 Imp. Gals?
True/False
When are pumpouts best done?
Pumpouts best done in spring, to allow restart in warm months.
True/False
What is the minimum recommended slope on a 4” building sewer?
Minimum recommended slope on 4” building sewer is 1/8.
Are septic systems sized by the number of bedrooms in a house?
True/False
Are septic systems sized by the number of people in an assembly building?
True/False
What materials can be used for septic tanks?
Materials can be concrete, fiberglass, plastic.
True/False
What does an effluent filter at the outlet ensure?
Effluent filter at outlet ensures solids stay in tank.
Must a septic tank have two compartments or two tanks in series?
Must have two compartments, or have two tanks in series.
True/False
What is the first compartment of a septic tank called?
First compartment called septic chamber; second is the effluent chamber.
What is the maximum size of openings in an effluent filter?
Max 1/8” openings in effluent filter.
True/False
Could pathogenic (disease-bearing) bacteria be present in septic systems?
Pathogenic (disease-bearing) bacteria could be present.
True/False
What is the maximum expected daily volume for Type 1 systems?
Type 1 systems limited to maximum expected daily volume of 22700 litres.
True/False
What does ‘BOD’ stand for?
‘BOD’ is measurement of sewage concentration (‘Biochemical Oxygen Demand’).
What is the BOD5 limit for Type 2 systems?
Type 2 systems limited to not more than 45 mg/l BOD5 (5 day).
True/False
What is the BOD5 limit for Type 3 systems?
Type 3 systems limited to not more than 10 mg/l BOD5 (5 day).
True/False
What does ‘TSS’ stand for?
‘TSS’ means Total Suspended Solids.
True/False
