2. •Bio filtration is a pollution control technique using a bioreactor
containing living material to capture and biologically degrade pollutants.
•Biofiltration is a relatively emerging new technology, applied to
wastewater treatment and other toxic compounds.
•Examples of bio filtration include
bio scrubbers, Vermifilters
trickling filters
Slow sand filters
Treatment ponds
Green belts
Green walls
12. • Installation costs are low. Most biofilters are constructed from common
materials locally available such as lumber, fiberglass, and plastic pipe.
• Depending on the amount of pretreatment the emissions require,
operating costs are usually low. These costs consist of electricity to
operate the primary blower and the humidification pump, part-time labor to
check on the process, and small quantities of macronutrients.
13. • Large land requirement for traditional design.
• No continuous internal liquid flow in which to adjust bed pH or to
add nutrients.
•.Bed replacement can take 2 to 6 weeks, depending on bed size.
• Natural bed media used in biofilters must be replaced every 2 to 5
years.