* See NORIT Biogas Webpage for more information.  

High Loading Capacity

Multiple independent laboratories have measured the minimum hydrogen sulfide loading capacity of DARCO H2S LP at greater than 0.2 g/ml using the ASTM D-6646 test method. This test method is used to measure the weight of H₂S loading per unit volume of carbon.

Tips on Vessel design for H₂S (and mercaptan) removal using DARCO H2S LP

The corrosive nature of H₂S requires appropriate materials of construction for treatment equipment. Fiber-reinforced plastic (FRP) vessels and ducts are common. Some equipment suppliers use FRP-coated blowers and impellers, especially when the blower is placed before the activated carbon bed.

Odor control activated carbon beds typically run in up-flow mode at a few inches of water column pressure. While carbon vessel dimensions tend to vary, low length-to-diameter (L/D) is a common characteristic of units operated under vacuum conditions. For systems designed to operate under positive pressure, the beds are relatively deep (3-4’).

Operational Parameters

• Empty Bed Contact Time (EBCT) of 3-6 seconds

• Linear Velocity of 10-60 ft/min (5-30 cm/s)

• Minimum Bed Depth ~2 ft

Oxygen is required for effective performance (more than four times the H₂S concentration on a molar basis is normally sufficient). A relative humidity range of 60% to saturated is recommended to achieve high loading on DARCO H2S LP.

We offer:

• Activated carbons with unique properties especially suited for odor removal

• Extruded carbon with a catalytic surface or an impregnation to oxidize H2S and physically adsorb organic (sulfur) components.

Optimal filter design with required contact times, removal efficiencies, and pressure drop can be advised by our technical support engineers. Adsorption isotherms and experience from the field determine the service life.