Closed biological treatment process

{
  "id": "MLC-T-ENV-005270",
  "term": "Closed biological treatment process",
  "field": "Environment",
  "term_source": "Closed Biological Treatment Process",
  "definition": "1. Tank or surface impoundment where biological treatment occurs and air emissions from the treatment process are routed to either a control device by means of a closed-vent system or by means of hard-piping. The tank or surface impoundment has a fixed roof, as defined in this section, or a floating flexible membrane cover that meets the requirements specified in § 63.1256(c).\n\n2. Tank or surface impoundment where biological treatment occurs and air emissions from the treatment process are routed to either a control device by means of a closed vent system or to a fuel gas system by means of hard-piping. The tank or surface impoundment has a fixed roof, as defined in this section, or a floating flexible membrane cover that meets the requirements specified in § 63.134.",
  "subject": "Built environments",
  "references": [
    "40 CFR 63.1251 (CFR 2013)",
    "40 CFR 63.101 (CFR 2024)"
  ],
  "url": "https://mlchart.com/terminology/environment/closed-biological-treatment-process/"
}