Spent Caustic Waste Stream

{
  "id": "MLC-T-ENV-026355",
  "term": "Spent Caustic Waste Stream",
  "field": "Environment",
  "definition": "1. Continuously flowing process wastewater stream that results from the use of a caustic wash system in an ethylene production unit. A caustic wash system is commonly used at ethylene production units to remove acid gases and sulfur compounds from process streams, typically cracked gas. The spent caustic waste stream does not include spent caustic streams generated from sampling, maintenance activities, or shutdown purges.\n\n2. Continuously flowing process wastewater stream that results from the use of a caustic wash system in an ethylene production unit. A caustic wash system is commonly used at ethylene production units to remove acid gases and sulfur compounds from process streams, typically cracked gas. Before July 6, 2023, the spent caustic waste stream does not include spent caustic streams generated from sampling, maintenance activities, or shutdown purges. Beginning on July 6, 2023, the spent caustic streams generated from sampling, maintenance activities, or shutdown purges are included in the definition of spent caustic waste stream.",
  "references": [
    "40 CFR 63.1082 (CFR 2013)",
    "85 FR 40386; 40 CFR 63.1082 (CFR 2021)"
  ],
  "url": "https://mlchart.com/terminology/environment/spent-caustic-waste-stream/"
}