• Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

Card Range To Study



Play button


Play button




Click to flip

Use LEFT and RIGHT arrow keys to navigate between flashcards;

Use UP and DOWN arrow keys to flip the card;

H to show hint;

A reads text to speech;

17 Cards in this Set

  • Front
  • Back
2 Reasons for
Water Treatment (sewage)
1. Prevent disease transmission
2. Reduce amount of organics
What happens if aquatic microbes use aerobic respiration?
The water becomes aerobic (almost no dissolved oxygen) which means death by suffocation of fish & shelfish
What is produced by anaerobic microbes that use fermentation or anaerobic respiration?
Smelly gases
_________ is a sulfate reducing bacteria that produces SO4 to _____ by aerobic respiration (to get a rotten egg smell).
Desulfovibrio & H2S
_________ Treatment: physically separates "biosolids" from dissolved & suspended organics.
In Primary Treatment, how much of the organics can be removed?
What does Secondary Treatment do?
Treats water from Primary Treatment
What are the 2 goals of Secondary Treatment?
Goal 1: Rapid conversion of organic carbon to CO2 gas
Goal 2: Reduce pathogens
What does Secondary Treatment rely on in converting organic carbon to CO2 gas?
It relies on microbes to do aerobic respiration which turns the organics/sugars/etc into CO2
For the rapid conversion of organic carbon to CO2 in Secondary Treatment to be successful, we need lots of _______ to reduce organics by _______ in a few hours.
oxygen & 90-95%
It's possible that the microbes (in Secondary Treatment) can sometimes be killed. This means that the organics cannot get decomposed. What is an example a microbe-killing substance?
Toxic Chemicals (ex:// too much disinfectant flushed down a toilet)
In Secondary Treatment, how do we get oxygen to the microbes? (2 ways)
1. Activated Sludge Tanks which use injections of compressed air
2. Use of a Trickling Filter
Describe a Trickling Filter
Water is sprayed from rotating arms (booms) and then flows over a deep bed of rocks (traditionally), as it trickles on the rocks, it picks up oxygen and microbes will colonize on the rocks using slime layers and then they break down organics aerobically
In Secondary Treatment, the reduction of pathogens occurs where?
In the Activated Sludge Tank and Trickling Filter
What are the 3 ways of reducing pathogens in Secondary Treatment?
1. Flocculation
2. Predation
3. Competition
Describe Flocculation
Organic balls of goo & microbes (sticky balls) "floc" like biosolids; they sink to the bottom removing pathogens from water
Describe Predation
Preying on other microbes- especially protozoans, they prey on bacteria