Component	Specifications (Design Considerations)	Comments
Temperature-Controlled Circulating Water Heater	Temperature Range: 25-65 °C (Heating Capacity, Max. Pressure Head, Volumetric Flow Rate)	Heated water must be supplied at a sufficiently high flow rate and with sufficient pressure to fully circulate.
Sampling Port	NA	Located close to headspace is ideal.
Foam Trap	Volume: 25% of Reactor Volume	Simple side-arm flask or glass jars can be used. The unit should be accessible for cleaning.
Hydrogen Sulfide Scrubber	(Gas Contact Time)	Glass or plastic tubes should be used (not metal). Sizing length should provide adequate gas contact time.
Gas Reservoir	Volume: > 2x Effluent Volume; Material: Semi-Elastic (not Rigid)	The volume should exceed that taken during effluent decanting. The material should allow for shrinking and expansion.
Bubbler	NA	The head pressure provided by the water level should be minimized to limit pressure build-up in the gas delivery system.
Gas Meter	(Gas Flow Detection Range)	Plastic gas meters are preferred over metal. The gas flow detection range should be accurate at expected biogas production rates.