Biofiltration of formaldehyde, acetaldehyde, and acrolein from polluted airstreams using a biofilter

Abstract

BACKGROUND Aldehydes inhalation can adversely affect human and environmental health. This study was carried out to investigate the removal efficiency (RE) of three aldehydes including formaldehyde (FA), acetaldehyde (ACT), and acrolein (ACR) from airstreams using a biofilter packed with a new mixture of compost‐scoria‐sugarcane bagasse. Influence of inlet concentrations (0.63–25.15 mg/m3), empty bed residence time (EBRT) (40, 80, and 120 s), and bed height on the biofilter efficiency were measured for three separate 90‐day periods. RESULTS The mean RE of FA, ACT, and ACR were 92.6 ± 4.6, 85.3 ± 6.2, and 86.3 ± 5.7%, respectively. The mean RE at EBRTs of 40, 80, and 120 s was 84.9 ± 6.1, 87.9 ± 6.2, and 91.4 ± 5.1%, respectively. Results showed that the RE decreased with increasing inlet concentration, so that the minimum RE (80.2 ± 4.7%) was observed at the inlet concentration of 78.5–25.15 mg m‐3. Also, more than 68% of the overall RE occurred in section 1 of the biofilter, where the mean bacterial population (7.51 log10CFU g‐1) was higher than that in section 2 (7.02 log10CFU g‐1). CONCLUSIONS Owing to the high RE and negligible pressure drop of the bed, it can be concluded that a biofilter with the same conditions is a satisfactory technique to remove aldehydes from polluted air. © 2017 Society of Chemical Industry

Characterization of bovine ruminal content focusing on energetic potential use and valorization opportunities

“…Moreover, this is a compound that results from the thermal degradation of lignin. A possible problem with the presence of this compound in the TGA-MS analysis is that it is highly volatile, flammable, and genotoxic [ 73 , 74 ].…”

Formaldehyde Removal by Expanded Clay Pellets and Biofilm in Hydroponics of a Green Wall System

“…A GWS consists of tanks filled with a substrate, different plant species, as well as irrigation and ventilation systems that provide water circulation and air flow within the GWS. Among the substrates used for air biofiltration systems, polyurethane [8], husk-based substrates with activated carbon [9], mixtures of compost-scoria-sugarcane bagasse [10], expanded clay pellets with different amendments [7][8][9], and other compositions have been reported. The effectiveness of air biofiltration in a GWS is highly dependent on the plant species [11].…”