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.
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Entries starting with: N
Nitrogenous BOD (biochemical oxygen demand) - The stage of decomposition that occurs in biological treatment processes when specialized aerobic bacteria (nitrifiers), use DO to change ammonia to nitrate; sometimes referred to as second-stage BOD.
NOM – Natural Organic Matter
Non-Exceptional Quality Biosolids
Non-exceptional quality biosolids are biosolids that meet specified pollutant and pathogen reduction criteria. Criteria for non-exceptional quality biosolids are less stringent than criteria for exceptional quality biosolids.
Note: The term 'Biosolids' can be used to refer to all categories of biosolids collectively, or can be used to refer specifically to the category non-exceptional quality biosolids.
Noncommunity Water System
Noncommunity Water System (NCWS)
Particles that take a lengthy amount of time to settle by gravity (i.e. many hours, days, or years).
Nontransient Noncommunity Water System
Notice of Violation
Notice of Violation (NOV)
NOV – Notice of Violation
NPDES - National Pollutant Discharge Elimination System
NPDWR – National Primary Drinking Water Regulations
NPDWRs (or primary standards) are legally enforceable standards that apply to public water systems.