Wastewater
Sludge that is intended for beneficial reuse.
Compost
An environment where chemically combined oxygen is available.
Anaerobic
When a chlorine residual greater than 0.1 mg/L is detected, what chemical must be used by the operator for dechlorination out in the field, not the lab?
Sulfur dioxide (SO2)
In 1972, Congress adopted this to protect the waters of the nation.
Clean Water Act
Chemical name for NH4+ is _____.
Ammonium
Velocity of the wastewater has slowed down in this chamber to allow solids to settle. The organics are washed off the ____ and resuspended into the wastewater.
Grit
A disease causing organism that inflicts damage on its host.
Pathogen
Name three forms of disinfection used in wastewater?
Ozone
Chlorine (liquid, gas, and powder)
UV Light
The acronym NPDES stand for
National Pollutant Discharge Elimination System
Chemical name for NO2- is _____.
Nitrite
The process in wastewater treatment in which air is forced into sewage mixed liquor to develop a biological floc in order to reduce the organic content.
Activated Sludge
Bacteria that use carbon dioxide (CO2) as a carbon source.
Autotrophic Bacteria
The process of eliminating or reducing harmful microorganisms.
Disinfection
This pollutant will cause fish kills at 10 mg/L or more if not removed by nitrification.
Ammonia
This chemical name for HCO3- is _____.
Bicarbonate
The stage of wastewater treatment that converts dissolved solids into settleable solids that can be removed by sedimentation.
Secondary Treatment
During denitrification, this bacteria will utilize nitrates and raw sewage.
Facultative Heterotrophic Bacteria
Which of the following contaminants will reduce the effectiveness of UV light during the disinfection process. BOD, Ammonia, TSS, or Nitrates.
TSS
Nitrates that exceed the MCL of 10 mg/L could cause ____ in babies.
Methemoglobinemia
Lab technicians remove excess chlorine from BODs with this chemical.
Sodium sulfite.
Solids from the secondary clarifier are "wasted" and sent to the _____ for decomposition.
Digester
Escherichia coli (E.coli) are a subgroup of what Coliform?
Fecal
______ and _______ are pathogens resistant to chlorine disinfection.
Giardia and Cryptosporidium.
Monitoring wells are often sampled and analyzed to satisfy this permit.
Ground Discharge Permit
This alkaline substance will help absorb excess H+ produced during the nitrification process.
Calcium Carbonate