The inside of the purification tank is usually filled with various adsorbents, such as activated carbon, molecular sieves, etc., to absorb organic matter and odorous substances in the exhaust gas. These adsorbents can effectively adsorb harmful substances in exhaust gas and improve purification efficiency.

Some purification tanks use catalysts, such as supported catalysts, to catalytically decompose or transform harmful substances in the exhaust gas, converting them into harmless substances, thereby purifying the exhaust gas.

The purification tank can also use physical filtration devices such as filters to filter solid particles in the exhaust gas, remove suspended particles, and improve the cleanliness of the exhaust gas.

Some purification tanks can also realize resource recycling by recycling useful components in the exhaust gas, such as organic substances.