Biological Treatment

biological secondary treatment process contains bacteria in much higher concentrations than normal systems true or false

Individual bacteria are easily observed with the naked eye true or false

The 5-day CBOD test measures all of the biodegradable material present in the wastewater true or false

Liquid may be absorbed into a sponge true or false

One goal of biological treatment systems is to?

Starches can be broken down by bacteria into simple sugars. The starches could be described as

Which of the following substances can be measured with the COD test but not the BOD test

Substances that are both soluble and non-abiodegradable will be

A sand particle that was not dens enough to be captured by the primary clarifier passes into the biological secondary treatment process. Where is the sand particle most likely to end up once treatment is complete

The difference between the soluble COD and the WRRF influent and effluent is

The cell membrane serves as a selective barrier that only allows some substances to pass through true or false

Enzymes are catalysts true or false

Prednisones are predators that can consume large quantities of free swimming bacteria true or false

Metazoa are multicellular animals and are typically smaller than both protozoans and bacteria true or false

A bacterium can move _____ across its cell membrane without expending energy

Extracellular polymeric substances

When a bacterium reproduces how many daughter cells are produced from each parent sell

A single bacterium enters the treatment process and has access to a limited amounts of food energy oxygen and other substances it needs to grow and reproduce. If the bacterium can reproduce every 20 minutes how many bacteria will there be after 1 hour

During the lag phase of bacterial growth

sugar is combined with oxygen to produce carbon dioxide and water in this reaction the sugar is being oxidized true or false

Autotrophic bacteria consume CBOD and produce new bacteria carbon dioxide and water true or false

Autotrophic bacteria grow faster than heterotrophic bacteria because their fuel source is energy rich true or false

The phosphate accumulating organisms must be cycled between anaerobic and antoxic or aerobic conditions to perform luxury uptake of phosphorus true or false

Heterotrophic bacteria obtain both their energy and their carbon from

algae are classified as

Anaerobic

Anoxic

Aerobic

When heterotrophic bacteria consume CBOD in the presence of oxygen the byproducts will be

Obligate aerobics require _____ for respiration

A heterotrophic bacterium is placed under anox conditions The bacterium will

The process of consuming CBOD with nitrate is called

The NOB

Phosphate accumulating bacteria obtain the energy they need to pick up VFAs under anaerobic conditions from

Sulfate reducing bacteria produce this toxin gas under anaerobic conditions

Production of sulfuric acid and collection systems and WRRFs is a concern because

every type of bacteria has a maximum growth rate that can be achieved when resources are present in excess and environmental conditions are favorable true or false

when resources are limited the growth rate of the bacteria will be proportional to the concentration of the most limited substrate

The saturation coefficient for a particle heterotrophic bacteria is 20mg/L of BOD. Growth rate will increase rapidly at BOD concentrations above 20mg/L true or false

There can be only one limiting substrate at any time true or false

The amount of new microorganisms produced each day is dependent on the amount of food entering the treatment process true or false

assuming that a bacterium has all the nutrients and environmental conditions it needs to grow and reproduce when will growth rates be fastest

This term is used to describe how fast or slow a chemical or biological reaction takes place

A common limiting factor for bacterial growth in secondary treatment process is

This equation predicts the growth rate of bacteria based on the availability of resources

The influence BOD to a WRRF suddenly decreases by 30%. The number of new bacteria produced in the secondary treatment process

The half saturation coefficient of BOD for a particle bacteria is 15 mg/L And the maximum growth rate is 12 g/VSS/g VSSd. If the concentration of BOD in the process is 15mg/L What is the growth rate of the bacteria