Term
| Organic material is broken down into_______ through the activated sludge process |
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Definition
CO2
H2O
New microorganism so |
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Term
| Biological reactors and clarifier are part of |
|
Definition
| The activated sludge process following primary treatment. |
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Term
|
Definition
| Mixed liquor suspended solids |
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Term
|
Definition
|
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Term
|
Definition
|
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Term
True or False;
Solids retention time(SRT) is the average time solids are held in a biological treatment system. |
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Definition
|
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Term
|
Definition
| The Food-To-Microorganism ratio. |
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Term
| Binary Fission is the process of ____ |
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Definition
| A mature cell separating into 2 new cells. |
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Term
True or False;
Aerobic organisms don't need oxygen |
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Definition
False.
Aerobic - need oxygen
Anaerobic - don't need oxygen |
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Term
| Facultative bacteria _____ |
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Definition
| Can live in both the presence of oxygen and the absence of oxygen. |
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Term
| The three stages of the micro organism life cycle are ___ |
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Definition
Exponential growth
Declining growth
Endogenous decay |
|
|
Term
True or False;
Most activated sludge processes operate in the range between declining growth and endogenous decay phases. |
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Definition
|
|
Term
| The main goals of activated sludge process are |
|
Definition
BOD removal
TSS removal
Maintaining neutral pH |
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Term
|
Definition
| Biochemical Oxygen Demand |
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Term
| Sequencing Batch Reactor (SBR) steps |
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Definition
1. Fill
2. React (aerate)
3. Settle
4. Decant (remove treated water) |
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|
Term
True or False;
Typical DO levels in the biological reactor is 3.0 to 5.0 mg/L |
|
Definition
False,
DO levels are 1.0-4.0 mg/L |
|
|
Term
True or False;
Reactors can be in series or in parallel. |
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Definition
|
|
Term
| Biological reactor configuration criteria |
|
Definition
Minimize short-circuiting
Optimize aeration
Minimize turbulence at outlet |
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Term
| Types of aerators / oxygen transfer systems. |
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Definition
Surface aerator.
Diffused aeration systems.
Hybrid devices.
High purity oxygen systems.
Mechanical surface aerators. |
|
|
Term
True or False;
Surface aerators splash and throw water into the air, aerating the solution. |
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Definition
|
|
Term
|
Definition
Positive displacement blower.
Centrifugal blower. |
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|
Term
True or False;
Blowers must be capable of meeting a wide range of air flow requirements. |
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Definition
True;
Thus variable frequency/speed drives are used with blowers. |
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|
Term
|
Definition
Hydraulic Retention Time,
The amount of time a small volume of the process stays in a particular section. Example - reactor or clarifier |
|
|
Term
True or False;
High purity oxygen systems have a small reactor size requirement. |
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Definition
|
|
Term
True or False;
Temperature does not affect microorganism population size. |
|
Definition
|
|
Term
| What causes mixed liquor microorganisms and wastewater to separate in a clarifier? |
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Definition
|
|
Term
|
Definition
| The influent side of the biological reactor. |
|
|
Term
True or False;
Chlorine can be used to help settling problems |
|
Definition
|
|
Term
|
Definition
| Mean Cell Retention Time. |
|
|
Term
| Optimal pH range for activated sludge processes is |
|
Definition
|
|
Term
True or False;
Filamentous bacteria can lead to bulking sludge |
|
Definition
|
|
Term
| Turbid effluent and/or grey and black sludge indicates |
|
Definition
| Low-DO conditions, and the presence of filamentous bacteria. |
|
|
Term
True or False;
The MCRT of most activated sludge processes is 5-15 days. |
|
Definition
|
|
Term
| White foaming indicates the presence of |
|
Definition
Nocardia
And
High F:M ratio |
|
|
Term
| Most microorganisms in activated sludge are |
|
Definition
| Heterotrophic, meaning they eat organic material. |
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|
Term
| Causes of solids washout are |
|
Definition
Equipment malfunction.
Hydraulic overload.
Solids overload.
Temperature or density currents. |
|
|
Term
True or False;
Hydraulic overload is caused by excessive influent flow. |
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Definition
|
|
Term
| _____ can help with density currents. |
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Definition
|
|
Term
| Chemicals that are used for pH adjustments. |
|
Definition
Caustic Soda
Sodium Bicarbonate
Lime |
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|
Term
| Rising sludge is caused by denitrification, what is denitrification? |
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Definition
| A single step process to convert nitrates to nitrogen gas. |
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Term
True or False;
New sludge can cause pinpoint floc |
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Definition
False;
Old sludge with poor floc-forming characteristics can cause pinpoint floc. |
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Term
|
Definition
| Material Safety Data Sheet |
|
|
Term
| A stable process can be achieved in _____ after re-seeding or shutdown. |
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Definition
|
|
Term
| Denitrifying microorganisms use what as oxygen sources? |
|
Definition
|
|
Term
| Two types of sampling are |
|
Definition
|
|
Term
True or false;
A sample should be taken from still water |
|
Definition
False;
Samples should be taken from a well mixed area. |
|
|
Term
True or False;
The BOD test is used to measure a sample's organic strength. |
|
Definition
|
|
Term
|
Definition
CBOD - carbon based
NBOD - nitrogen based |
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|
Term
| The activated sludge process is considered to be running well when ____ are present in low numbers. |
|
Definition
| Rotifera and stalked ciliates. |
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Term
| The steps of activated sludge treatment. |
|
Definition
Screening
Grit removal
Primary clarifier
Biological reactor
Secondary clarifier
Filtration
Disinfection |
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