Breakthrough

{
  "id": "MLC-T-ENV-003637",
  "term": "Breakthrough",
  "field": "Environment",
  "definition": "1. A crack or break in a filter bed allowing the passage of floc or particulate matter through a filter. This will cause an increase in filter effluent turbidity A breakthrough can occur: 1) when a filter is first placed in service, 2) when the effluent valve suddenly opens or closes, and 3) during periods of excessive head loss through the filter (including when the filter is exposed to negative heads).\n\n2. A crack or break in a filter bed that allows the passage of floc or particulate matter through a filter; will cause an increase in filter effluent turbidity.\n\n3. Point in the adsorption step when the mass transfer zone (i.e., the section of the carbon bed where the HAP is removed from the carrier gas stream) first reaches the carbon bed outlet as the mass transfer zone moves down the bed in the direction of flow. The breakthrough point is characterized by the beginning of a sharp increase in the outlet HAP or organic compound concentration.\n\n4. Time when the level of HAP or TOC, measured at the outlet of the first bed, has been detected is at the highest concentration allowed to be discharged from the adsorber system and indicates that the adsorber bed should be replaced.[85 FR 49084; 40 CFR 63.255 (CFR 2021)]\n\n5. Time when the level of TOC, measured at the outlet of the first bed, has been detected is at the highest concentration allowed to be discharged from the adsorber system and indicates that the adsorber bed should be replaced.",
  "subject": "General environmental",
  "references": [
    "Drinking Water Technical & Legal Terms",
    "Terms of Environment",
    "40 CFR 63.1292 (CFR 2013)",
    "40 CFR 63.101 (CFR 2024)",
    "40 CFR 60.611a (CFR 2024)"
  ],
  "url": "https://mlchart.com/terminology/environment/breakthrough/"
}