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11 Cards in this Set

  • Front
  • Back

What is the official title of the regulations?

40 Code of Federal Regulations, Part 503

What does the regulation protect?

Public Health and the environment from the constituents that may be found in biosolids

What is the difference between Class A and Class B biosolids?

The level of pathogens in the biosolids when they are recycled or disposed

Define pathogenic organisms

Certain bacteria


Protozoa


Viruses


Viable helminth ova (leads to parasitic worms)

Define vector attraction

A characteristic of biosolids that attracts rodents, flies, mosquitoes, and other organisms capable of transmitting disease.

How many alternatives are available to meet the requirement of vector attraction reduction?

12

What is the most common alternative to meet the requirement for vector attraction reduction?

Meet 38 percent reduction in volatile solids content (either aerobically or anaerobically)

How many alternatives are there to achieving Class A biosolids? What must they ALL accomplish?

Six.


Less than 1,000 MPN FC/g OR...


Less than 3 MPN Salmonella/4g

What are some common alternatives used to treat Class A Biosolids?

Thermally is one of four time-temp regimes (expl 50 C for 13.2 days)


High-Temp High-pH

What are the parameters for High-Temp High-pH treatment of Class A Biosolids

pH above 12 for 72 hours


Temp above 52 C for 12 of those 72 hours


Dried to at least 50% TS

What is the easiest of the seven processes to further reduce pathogens?

Heat treatment: Liquid biosolids are heated to 180 C or higher for at least 30 min