Equipment
Equipment
This domain tests selection and operation of capture and treatment equipment. You must match equipment to odorant, flow, concentration, and site constraints.
Core rules
- Covers, hoods, and ducting capture emissions; fans move air. Capture efficiency depends on enclosure and ventilation design.
- Packed-bed scrubbers use mass transfer; venturi scrubbers handle high dust or high solubility; biotrickling filters and biofilters use microbial degradation.
- Activated carbon adsorbers polish low concentrations; spent carbon must be replaced or regenerated. Humidity and high H2S load shorten bed life.
- Thermal oxidizers destroy VOCs at high temperature; they are not ideal for dilute, high-volume air.
- Monitor pressure drop, pH, ORP, irrigation rate, and outlet concentration.
Worked example
A compost facility has continuous low-concentration odor and limited space. A biofilter is a good fit if media moisture and temperature are controlled; carbon would be expensive because of frequent replacement. For an intermittent high-H2S sludge-dewatering room, a packed scrubber with hypochlorite and a carbon polisher may be better. The reasoning: match loading and variability to equipment.
Traps
- Oversizing a carbon bed without checking humidity and H2S loading.
- Letting a biofilter dry out or channel.
- Treating high-volume dilute air with a thermal oxidizer.
- Ignoring capture; poor hooding defeats good treatment.