Particles that take a lengthy amount of time to settle by gravity (i.e. many hours, days, or years).

• (COA01) Coagulation – Part 1: The Chemistry of Coagulation (1248)

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.

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

Noncommunity Water System (NCWS)

1. A public water system that is not a community water system
   • (DBP15) DBP Rule – Maintaining Compliance for Pa. PWSs using Chlorine/Chloramines (1570)
2. A public water system that is not a community water system. Noncommunity water systems are further categorized as nontransient and transient water systems.
   • (PNR01) Public Notification – An Introduction for NCWSs (2332)

NOM – Natural Organic Matter
Organic matter that exists naturally in the water environment.

• (DBP01) DBP Rule – Overview (1282)
• (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)

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.

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

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.

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

Also known as nitrifiers

Specialized bacteria (such as Nitrosomonas and Nitrobacter) that change ammonia and organic nitrogen in wastewater, into oxidized nitrogen (usually nitrate).

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

Specialized bacteria (such as Nitrosomonas and Nitrobacter) that change ammonia and organic nitrogen in wastewater, into oxidized nitrogen (usually nitrate).

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

1. An aerobic process in which specialized bacteria (such as Nitrosomonas and Nitrobacter) change the ammonia and organic nitrogen in wastewater into oxidized nitrogen (usually nitrate).
   • (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)
   • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)
2. Biological oxidation of ammonium to nitrite and nitrate, or a biologically induced increase in the oxidation state of nitrogen.
   • (BIO01) Biosolids Agronomic Loading Rates Part 1 (1247)
   • (BIO02) Biosolids Agronomic Loading Rates Part 2 – Manure (1484)

NCWS - Noncommunity Water System

1. A public water system that is not a community water system
   • (DBP15) DBP Rule – Maintaining Compliance for Pa. PWSs using Chlorine/Chloramines (1570)
2. A public water system that is not a community water system. Noncommunity water systems are further categorized as nontransient and transient water systems.
   • (PNR01) Public Notification – An Introduction for NCWSs (2332)