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It aimed to explore the effect of sodium thiosulfate on the removal of formaldehyde by adding sodium thiosulfate to the spray liquid. Experimental results were as follows: formaldehyde in the spray liquid could be removed maximumly when the sodium thiosulfate concentration was 0.05mol/L. When the formaldehyde concentration was 100 ~ 400mg/m3, with the increase of formaldehyde concentration, the group added with sodium thiosulfate had the highest removal efficiency of 99.8% and the highest biochemical removal amount of 13mg/(L·h); When spray liquid flow was within the range of 5 ~ 20L/h, the effect of spray liquid flow on the formaldehyde removal was little, and the maximal removal efficiency of sodium thiosulfate was 99.5%, with maximal biochemical removal up to 7.85mg/(L·h); When gas flow was in the experimental range of 0.05 ~ 0.25m3/h, and sodium thiosulfate removal efficiency of group with sodium thiosulfate was 99.6% ~ 99.9%, the biochemical removal amount increased with the increase of gas flow, and was higher than that in the blank control group. Pseudomonas, Methylobacillus, comamonas, Hyphomicrobium, Methylophilus, methylogenic lis and Cupriavidus were seen as the dominant microbial in sodium thiosulfate group. Adding appropriate amount of sodium thiosulfate in the spray fluid could remove formaldehyde in it effectively, promote the removal of biotrickling filter on formaldehyde emissions, so as to provide experimental evidence for the feasibility of sodium thiosulfate on biotrickling filter in the removal of formaldehyde in the future.

Analysis on the Effect of Spray Liquid Added with Sodium Thiosulfate on the Biological Purification of Formaldehyde Waste Gas