Course Glossary

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This shows the specialized terms used in EarthWise Academy. This section contains all the definitions used in the various course glossaries used by each course.

Browse the glossary using this index

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Entries starting with: M

MCRT

MCRT - Mean Cell Residence Time

An expression of the average time that a microorganism or solid particle undergoes aeration in the activated sludge process.

  • (BIO10) Estimating Sludge Volume (2343)
  • (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)
  • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

Mean Cell Residence Time

Mean Cell Residence Time (MCRT)

An expression of the average time that a microorganism or solid particle undergoes aeration in the activated sludge process.

  • (BIO10) Estimating Sludge Volume (2343)
  • (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)
  • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

Methemoglobinemia

Blood disorder caused when nitrite, converted from nitrate in the digestive system, interacts with the hemoglobin in red blood cells forming methemoglobin which cannot carry sufficient oxygen to the body's cells and tissues.

  • (BIO01) Biosolids Agronomic Loading Rates Part 1 (1247)
  • (BIO02) Biosolids Agronomic Loading Rates Part 2 – Manure (1484)

MGD

Million Gallons per Day

  • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

Microbial/Disinfectants and Disinfection Byproduct

Microbial/Disinfectants and Disinfection Byproduct – (M/DBP)

  • (DBP02) DBP Rule Monitoring and Reporting – Job Aids (1283)
  • (DBP10) DBP Rule Monitoring and Reporting for Chlorine⁄Chloramines (1284)
  • (DBP13) DBP Rule Monitoring and Reporting for TTHM⁄HAA5 (1285)

Microflocs

  1. Tiny masses of non-settleable microorganisms and particles that come together to form progressively larger, heavier particles.
    • (COA01) Coagulation – Part 1: The Chemistry of Coagulation (1248)
  2. Very small (usually visible to the human eye) masses of non-settleable microorganisms and particles. These are beginning stages of flocs that come together to form progressively larger, heavier particles.
    • (COA02) Coagulation — Part 2: Coagulation Chemicals (1249))

Million Gallons per Day

Million Gallons per Day – MGD

  • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

Mineralization

The conversion of an element from an organic form to an inorganic state as a result of microbial activity.

Mineralization Illustration

Mixed Liquor Suspended Solids

Mixed Liquor Suspended Solids (MLSS)

The concentration of suspended solids (both organic and inorganic) in the mixed liquor of an aeration tank. MLSS is used as a measure of the concentration of microorganisms present.

  • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

Mixed Liquor Suspended Solids (MLSS)

The concentration of suspended solids (both organic and inorganic) in the mixed liquor of an aeration tank. MLSS is used as a measure of the concentration of microorganisms present.

  • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

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