Wastewater BOD Indicator Lab Techniques Other

100

What is a pathogens, organic compounds, solid in suspension and microbial nutrients?
Waste water treatment has as purpose to eliminate

100

What is Biochemical or Biological Oxygen Demand. This value correlates to the amount of biological degradable compounds present in water or waste water
What is BOD and how relates to the efficiency of the wastewater plant?

100

What is indicator microorganisms
What kind of microorganisms are used as a sign of possible fecal contamination in water

100

What is heterotrophic count plates (HPC)
What technique used in the lab can be use to determine the total amount of microorganisms present in the samples?

100

What is can not determine if the microorganisms growing on the HPC plates are actually pathogenic and can't determine the identity
What is the disadvantage of using HPC technique?

200

What secondary treatment
This step in wastewater treatment is base in the presence and action of microorganisms.

200

What is the amount of oxygen consumed by microorganisms after 5 days of performing biological oxidation (breakdown waste)
When measure the BOD levels in a sample, what parameters would you measure?

200

What is indicator are enteric microorganisms commonly associated to possible pathogens, so the presence of one indicate the possible presence of the other
Why are the indicator microorganisms a better way to detect enteric microorganism (possible pathogens) in water?

200

What is Colilert technique
What technique can be used in the lab to determine the presence or absence of coliforms and E. coli?

200

What is detecting pathogens is dangerous, expensive, require special training, need identify each possible pathogen so time consuming and require too much time to get all this done.
Why is the detection of pathogens is done by detection of indicators and not directly by detecting the pathogens

300

What is aerobic and facultative aerobic
What group of microorganisms is the predominant population in the aeration tank? according to their oxygen requirement

300

What is to protect the receiving water body of water from reducing the oxygen level and kill fauna living in it
Government establish strict regulations on the levels of BOD the final effluent can contain before been released. Why are this regulation in place?

300

What is total coliforms as this group of microorganisms include environmental coliforms so the can give false positive results
What group of indicators are not good indicators and are only used as initial indicator of contamination?

300

What is most probably number technique in the form of Quanti-tray
What technique is use to detect presence and semi-quantify the total coliform and E. coli in water samples?

300

What is eliminate pathogens and toxins, reduce BOD and waste (microorganisms nutrients) from the sewage to minimize the environmental effect.
What are the 3 purposes of wastewater treatment

400

What is a heterotrophic
The degradation of solid in suspension in the wastewater treatment depends on the capacity of this microorganisms to consume a variety of compounds? According to their capacity to obtain food by consuming organic matter, this microorganisms are

400

What is the secondary treatment due to the presence and action of microorganisms
What stage in the wastewater treatment has the highest effect on the reduction of the BOD and why?

400

What is indicators are non-pathogenic, cheaper and easier to detect
Why are indicator more convenient to use to detect fecal contamination than pathogens directly

400

What is IMVIC
What technique is used to differentiate between E. coli and E. aerogenes?

400

What is evaluate the efficiency of the wastewater plant and ensuring the final effluent comply with the government regulations
What are the 2 purposes of measuring the bacterial load of the incoming sewage and the final effluent?

500

What is to increase the number of mature microorganism into the aeration tank and increase the speed of degradation of solids in suspension
The aeration tank receive in a regular base RAS that mix with the incoming primary effluent. What is the reason for this procedure.

500

What is biochemical oxygen demand (BOD)
What is the most common method to evaluate the level of solid in suspension (organic compounds) in waste water?

500

They are are just indicates POSSIBLE presence of pathogens, can not identify or quantify the amount of pathogens present.
The use of indicator microorganisms has advantages, but also disadvantages. What are disadvantages associated to this microorganisms?

500

What is membrane filtration method
You know the sample is contaminated but you need to determine the source of the fecal contamination?

500

What is ........ discuss this one with your classmates :)
Under what condition can cause positive results for all the samples in the Colilert tests?

Microorganisms Unit

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