Waste & Recycling

Continuous monitoring of methane, hydrogen sulphide and combustible gases in material recovery facilities and waste processing plants to protect workers and identify areas requiring improved ventilation.

Typical Waste & Recycling System

Target Gases

Gases monitored in this application

Methane

CH₄

Oxygen

O₂

Hydrogen Sulfide

H₂S

Why Gas Detection is Required

Organic waste decomposition in landfills, transfer stations, and waste handling areas generates methane (CH₄) and hydrogen sulfide (H₂S), both of which pose serious safety risks. Methane is highly flammable and explosive, while H₂S is toxic even at low concentrations and can quickly become fatal. Modern waste streams also introduce lithium ion batteries, creating a fire hazard in recycling facilities and e-waste operations, where damaged or crushed cells can enter thermal runaway, ignite surrounding material, or trigger hazardous gas releases. Workers in waste facilities often become acclimated to background odors and may not recognize dangerous accumulations. Enclosed processing buildings designed to contain odors also trap hazardous gases. Continuous monitoring protects workers and identifies areas requiring improved ventilation.

System Architecture

To comply with OSHA and EPA, a complete waste facility gas detection system typically consists of methane (LEL) sensors for explosion protection combined with H₂S sensors for toxicity monitoring, positioned throughout processing areas and in confined spaces. Oxygen and TVOC sensors are also suggested. Sensors connect to a controller that manages zone-specific ventilation and provides alarming when dangerous conditions develop. For smaller transfer stations, self-contained detector-controller units provide economical protection for key processing areas. Larger material recovery facilities benefit from networked architectures with sensors throughout the processing line, enabling rapid identification of problem areas and coordinated ventilation response. Alarm outputs activate audible/visual notification devices, trigger local exhaust ventilation, and can interface with equipment controls to shut down operations when explosive atmospheres develop. Sensors must be selected for durability in harsh, dusty, high-humidity environments typical of waste processing.

Key Considerations

Important factors for planning your system

Methane (LEL) monitoring near waste storage, compaction, and processing areas addresses explosion risk and MRF methane monitoring placed near conveyors, pits, and enclosed sorting lines

H₂S detectors positioned in areas prone to organic buildup, anaerobic pockets, or wastewater adjacent zone protecting workers from acute toxicity hazards

Oxygen monitoring in confined spaces (hoppers, pits, enclosed conveyors) prevents asphyxiation

Sensors must be robust enough for harsh, dusty, high-humidity environments

Additional Information

Waste facility gases vary seasonally with waste composition and ambient temperature. Summer months typically see higher decomposition rates and gas generation. Detection systems should be designed for worst-case conditions, with sensors rated for the temperature extremes and corrosive atmospheres typical of waste processing environments.