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

作者：Herrera Melian J A; Ortega Mendez A; Arana J; Gonzalez Diaz O; Tello Rendon E

来源：Process Biochemistry, 2008, 43(12): 1432-1435.

DOI：10.1016/j.procbio.2008.07.020

• Formaldehyde
• Biological aerated filter
• Constructed wetland
• Lemna minor
• Toxicity
• Wastewater

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/m(3) 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%).

• 出版日期2008-12