Short communication: Degradation and detoxification of formalin wastewater with aerated biological filters and wetland reactors

• Published in: Process biochemistry (1991) Vol. 43; no. 12; pp. 1432 - 1435
• Main Authors: Melian, J A Herrera, Mendez, A Ortega, Arana, J, Diaz, O Gonzalez, Rendon, E Tello
• Format: Journal Article
• Language: English
• Published: 01.12.2008
• DOI: 10.1016/j.procbio.2008.07.020
• ISSN: 1359-5113

Formalin wastewater containing high concentrations of formaldehyde and TOC was treated and detoxified with biological aerated filter (BAF) and wetland reactors. At similar formaldehyde loading rates (about 0.01-0.9 kg/m3 d) both reactors provided high efficiencies but the BAF was more efficient at treating formaldehyde and TOC with average eliminations of 98 and 92%, respectively. However, the BAF effluent was not always detoxified according to the Lemna minor toxicity test as growth inhibition was above 20%. Although the elimination of formaldehyde and TOC achieved by the wetland reactors (81 and 25%, respectively) was lower than that of the BAF, they provided higher total nitrogen reduction. The combination of BAF and wetland reactors is proposed as a novel and convenient method for the treatment of formalin wastewater as it provided almost complete elimination of formaldehyde and detoxified samples with L. minor negative growth inhibition (-45 to -52%).