Table 3.

Advantages and disadvantages of biological methods of deodorization of gases

	Bioscrubbers	Biofiltration
Advantages	- Simple technology - Low operation costs - Small pressure drops of flowing gas - Possibility of acidic gases deodorization	- Simple technology - Low operation costs - Low investment costs - Possibility of implementation in thorough gas purification processes - Low-waste technology - Possibility of application of filtering materials with strong adsorption properties
Disadvantages	- Necessity of application of suitable nutrients for microorganisms - Necessity of reagents dosing, for example in order to correct pH - Necessity of excess biomass removal	- Replacement of filtering material every 2–5 years - Difficulties with deodorization of gases with high pollutants content - Difficulties with pH correction (frequent need for buffering substances) - Necessity of bed humidity control - Necessity of bed oxygenation in case of purification of gases lacking oxygen - Problems with bed overgrowing - High spatial demands of the installation