caa a22 4500 605498059 CHVBK 20210128100544.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00253-014-5848-7 doi (NATIONALLICENCE)springer-10.1007/s00253-014-5848-7 Biofiltration of high formaldehyde loads with ozone additions in long-term operation [Elektronische Daten] [G. Maldonado-Diaz, S. Arriaga] Formaldehyde (FA) biofiltration was evaluated over 310days with and without ozone addition. Without ozone, the biofilter was able to treat formaldehyde at inlet loads (ILs) lower than 40gm−3h−1, maintaining, under this condition, an average removal efficiency (RE) of 88 % for a few days before collapsing to zero. The continuous addition of ozone (90 ppbv) helped to recover the RE from zero to 98 ± 2% and made it possible to operate at an IL of 40gm−3h−1 for long periods of operation (107days). Furthermore, the ozone addition aided in operating the biofilter at a formaldehyde IL of up to 120gm−3h−1 values that have never before been reached. GC-mass spectrometry (MS) analysis showed that dimethoxymethane was the common compound in leachate during the performance decay. Also, the addition of ozone aided in maintaining an optimal pH in the biofilter with values between 7.5 and 8.2, due to the carbonate species formed during the ozone reactions with formaldehyde and its by-products. Thus, the pH control was confirmed and the alkalinity of the biofilter increased from 334.1 ± 100.3 to 1450 ± 127mg CaCO3 L−1 when ozone was added. Ozone addition diminished the exopolymeric substances (EPS) content of biofilm and biofilm thickness without affecting cell viability. Kinetic parameters suggested that the best conditions for carrying out FA biofiltration were reached under ozone addition. The addition of ozone during formaldehyde biofiltration could be a good strategy to maintain the pH and the steady state of the system under high ILs and for long periods of operation. Springer-Verlag Berlin Heidelberg, 2014 Formaldehyde nationallicence Biofiltration nationallicence Ozone addition nationallicence pH control nationallicence Dimethoxymethane nationallicence High inlet load nationallicence Maldonado-Diaz G. División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055. Col. Lomas 4ª Sección, C.P 78216, San Luis Potosí, México aut Arriaga S. División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055. Col. Lomas 4ª Sección, C.P 78216, San Luis Potosí, México aut Applied Microbiology and Biotechnology Springer Berlin Heidelberg 99/1(2015-01-01), 43-53 0175-7598 99:1<43 2015 99 253 https://doi.org/10.1007/s00253-014-5848-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00253-014-5848-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Maldonado-Diaz G. División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055. Col. Lomas 4ª Sección, C.P 78216, San Luis Potosí, México aut NATIONALLICENCE 700 1- Arriaga S. División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055. Col. Lomas 4ª Sección, C.P 78216, San Luis Potosí, México aut NATIONALLICENCE 773 0- Applied Microbiology and Biotechnology Springer Berlin Heidelberg 99/1(2015-01-01), 43-53 0175-7598 99:1<43 2015 99 253