True and False Flashcards
(25 cards)
The key to trickling filter operation is maintaining anaerobic conditions throughout the filter
F
The main reason for keeping clarifier sludge solid concentration low is to decrease sludge digester-operating cost
F
Number of persons per pond surface acre is a method of expressing pond loading
T
If flow splits between two objects, it is considered to be parallel flow
T
As filter media void space increases, it becomes a poor media for use with trickling filters.
F
Industries generate a diversity of waste products
T
In a properly operating facultative pond, algae use up carbon dioxide causing pond pH to decrease
F
when a nitrified effluent is desired, at least a 2 mg/L DO concentration should be maintained in the aeration basin
T
Nutrient removal is common for conventional activated sludge treatment plants
F
It is important to keep sludge age low if you are to accomplish denitrification
F
Sulfur compounds are often used for dechlorination
T
The sludge digestion temperature will not affect gas production
F
MLSS DO can be measured by using a probe connected to a DO meter
T
Dechlorination is often accomplished with sulfur compounds
T
The sludge age for an activated sludge plant wasting to a primary clarifier should be the same age as an activated sludge plant wasting to a gravity thickener
T
Coliform bacteria can be used as an indicator of disease-causing organisms
T
A WAS or RAS flow rate change of 12% in one day will have little effect on the plant
F
Aerobic digester supernatant is normally low in BOD demand
F
Biological treatment processes are defined as primary treatment
F
Digester sludge can be disposed of on land sites if proper permits are obtained
T
Sludge bulking is caused by light sludge not settling properly
T
The volatile acid/alkalinity relationship is the key to proper anaerobic sludge digester operation
T
Activated sludge basin air addition is to maintain anaerobic conditions
F
A combined sedimentation-digestion is a type of package treatment plant
T
