Abstract

It aimed to explore the effect of sodium thiosulfateon the removal of formaldehyde by adding sodium thiosulfate tothe spray liquid. Experimental results were as follows:formaldehyde in the spray liquid could be removed maximumlywhen the sodium thiosulfate concentration was 0.05mol/L.When the formaldehyde concentration was 100 ~ 400mg/m3,with the increase of formaldehyde concentration, the groupadded with sodium thiosulfate had the highest removalefficiency of 99.8% and the highest biochemical removal amountof 13mg/(L·h); When spray liquid flow was within the range of 5~ 20L/h, the effect of spray liquid flow on the formaldehyderemoval was little, and the maximal removal efficiency ofsodium thiosulfate was 99.5%, with maximal biochemicalremoval up to 7.85mg/(L·h); When gas flow was in theexperimental range of 0.05 ~ 0.25m3/h, and sodium thiosulfateremoval efficiency of group with sodium thiosulfate was 99.6%~ 99.9%, the biochemical removal amount increased with theincrease of gas flow, and was higher than that in the blankcontrol group. Pseudomonas, Methylobacillus, comamonas,Hyphomicrobium, Methylophilus, methylogenic lis andCupriavidus were seen as the dominant microbial in sodiumthiosulfate group. Adding appropriate amount of sodiumthiosulfate in the spray fluid could remove formaldehyde in iteffectively, promote the removal of biotrickling filter onformaldehyde emissions, so as to provide experimental evidencefor the feasibility of sodium thiosulfate on biotrickling filter inthe removal of formaldehyde in the future.