Thursday, June 24, 2021, 12:02 PM
Site: Pa. DEP Operator eLearning Center
Course: Pa. DEP Operator eLearning Center (Home)
Glossary: Course Glossary
D

D Sample

Sample collected from the distribution system.

  • (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)
  • (DBP14) DBP Rule Violations for Pa. PWSs using Chorine⁄Chloramines (1825)
  • (DBP15) DBP Rule – Maintaining Compliance for Pa. PWSs using Chlorine/Chloramines (1570)

D Sampling Sites

Representative sites within the distribution system.

Sample Siting Plan

  • (LCR13) LCR Planning Tools for NTNCWS (2537)

DBP Rule

 

DBP Rule - Disinfectants and Disinfection Byproducts Rule

D&DBP RUle

  • (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)
  • (DBP14) DBP Rule Violations for Pa. PWSs using Chorine⁄Chloramines (1825)
  • (DBP15) DBP Rule – Maintaining Compliance for Pa. PWSs using Chlorine/Chloramines (1570)
  • (DBP41) Enhanced Coagulation – TOC Monitoring (1281)
  • (PNR11) Public Notification – Violations and Tiers for NCWSs (2333)

DBPs

  1. DBPs - Disinfection Byproducts
    • (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)
    • (DBP14) DBP Rule Violations for Pa. PWSs using Chorine⁄Chloramines (1825)
    • (DBP15) DBP Rule – Maintaining Compliance for Pa. PWSs using Chlorine/Chloramines (1570)
    • (DBP20) DBP Rule Monitoring and Reporting for PWSs Using Chlorine Dioxide (1278)
    • (DBP30) DBP Rule Monitoring and Reporting Requirements for PWSs Using Ozone (1279)
    • (DBP40) Enhanced Coagulation – Basics (1280)
    • (LCR11) LCR – Initial Planning, Monitoring and Reporting (1488)
    • (PNR01) Public Notification – An Introduction for NCWSs (2332)
  2. Compounds, such as HAA5's and TTHM's that form when disinfectants encounter certain organic substances present in raw water. Long term exposure to some disinfectant by-products has been linked to cancer.
    • (DBP43) Jar Testing for Process Control of Conventional Filtration: Part 1 (2019)

DBT

DBT - Design Basis Threat

Description of a specific adversary and mode of attack that has a degree of likelihood of occurring.

  • (SEC01) Securing Drinking Water and Wastewater Treatment Facilities 2954

Denitrification

An anoxic process that occurs when nitrite or nitrate ions are reduced to nitrogen gas and nitrogen bubbles are formed as a result of this process.

  • (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)

Denitrifiers

Facultative heterotrophic bacteria (such as Pseudomonas, Bacillus and Achromobacter) that convert nitrate in wastewater to nitrogen gas, given an anoxic environment.

  • (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)

Denitrifying bacteria

Also known as denitrifiers. Specialized bacteria (such as Pseudomonas and Achromobacter) that convert nitrate in wastewater, into nitrogen gas.

  • (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)

DEP

DEP - Department of Environmental Protection

Pennsylvania Department of Environmental Protection

  • (TCR01) Total Coliform Rule – Overview (1424)
  • (TCR02) Total Coliform Rule – Monitoring And Reporting Requirements (1425)
  • (TCR03) Total Coliform Rule – Maintaining Compliance (1426)

Department of Environmental Protection

Department of Environmental Protection (DEP)

Pennsylvania Department of Environmental Protection

Design Basis Threat

Design Basis Threat (DBT)

Description of a specific adversary and mode of attack that has a degree of likelihood of occurring.

  • (SEC01) Securing Drinking Water and Wastewater Treatment Facilities 2954

Destabilized

A condition in which the electrical charge of particles has been neutralized.

  • (COA01) Coagulation – Part 1: The Chemistry of Coagulation (1248)
  • (DBP43) Jar Testing for Process Control of Conventional Filtration: Part 1 (2019)

Detected Contaminant

Any contaminant detected at or above its detection limit.

  • (CCR01)Consumer Confidence Report (CCR) Overview (2338)

Detection Limit

The amount of a substance with that EPA has determined to be the minimum concentration that can be measured and reported with 99% confidence that the true value is greater than zero.

  • (CCR01)Consumer Confidence Report (CCR) Overview (2338)

Detention Time

The theoretical time that a parcel of water or other liquid spends in a particular treatment unit or reservoir.

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

Diatomaceous Earth

A fine material made up mostly of the skeletal remains of single cell, microscopic algae with a rigid, box-like internal structure consisting mainly of silica.

  • (DBP40) Enhanced Coagulation – Basics (1280)

Digester Capacity

The total volume in gallons that a digester(s) can hold, or the volume used during the monitoring period, if not operating at full capacity.

  • (BIO10) Estimating Sludge Volume (2343)

Discharge Monitoring Report

Discharge Monitoring Report (DMR)

Disinfectants

Substances that are added for the purpose of killing or inactivating the pathogenic (disease-causing) bacteria found in water.

Chlorine, Chloramines, & Chlorine Dioxide are disinfectants.

  • (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)

Disinfection Byproducts Precursors

Organic substances that combine with disinfectants to form potentially carcinogenic compounds such as HAA5’s and TTHM’s.

  • (DBP43) Jar Testing for Process Control of Conventional Filtration: Part 1 (2019)

Dissolved Oxygen

Dissolved Oxygen (DO)

A measure of the amount of free or molecular oxygen dissolved in water, expressed as:

  1. mg/L, which is the absolute amount of oxygen dissolved in the water mass or
  2. the percentage saturation of water with O2 (% sat).
    • (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)
    • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

DMR

DMR – Discharge Monitoring Report

  • (BIO10) Estimating Sludge Volume (2343)

DO

DO - Dissolved Oxygien

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

Double Layer Compression

In the double layer compression mechanism large quantities of a salt that has no charge (neutral) are added. The salt works by compressing the double layer around the colloid. When the outer layer is compressed, the repulsive energy barrier around the colloid is reduced or eliminated. This allows the particles to combine.

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

Drinking Water Electronic Laboratory Reporting

Drinking Water Electronic Laboratory Reporting (DWELR)

A web-based application that provides a means for laboratories that are accredited by or registered with DEP’s Bureau of Laboratories to submit their drinking water sample data to DEP’s public drinking water program.

  •  (TCR02) Total Coliform Rule – Monitoring And Reporting Requirements (1425)

DWELR

DWELR - Drinking Water Electronic Laboratory Reporting

A web-based application that provides a means for laboratories that are accredited by or registered with DEP’s Bureau of Laboratories to submit their drinking water sample data to DEP’s public drinking water program.

  • (TCR02) Total Coliform Rule – Monitoring And Reporting Requirements (1425)