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J Air Waste Manag Assoc. 2018 Sep;68(9):900-908. doi: 10.1080/10962247.2017.1417183. Epub 2018 Jul 23.

Comparative study on the removal efficiency of hydrogen sulfide (H2S) using three different packings.

Pu S1,2,3, Liu Z1,3, Yang F1,2, Long D1,2, Liu W1, Wang H1,2, Huang K1, Huang X1.

Author information

1
a Chongqing Academy of Animal Sciences , Chongqing , People's Republic of China.
2
b Scientific Observation and Experiment Station of Livestock Equipment Engineering in Southwest , Ministry of Agriculture , Chongqing People's Republic of China.
3
c Chongqing Key Laboratory of Pig Industry Sciences , Chongqing , People's Republic of China.

Abstract

To improve the removal efficiency on hydrogen sulfide (H2S), a biofilter was developed and was made of polyvinyl chloride (PVC) pipes. The effects of three different packings (i.e., packing A, packing B, and packing C), containing different proportions of activated carbon, sawdust, wormcast, perlite, and pig manure compost, based on different biofilter parameters on H2S removal efficiency, were investigated. With the extension of running time, the H2S removal rate of packing A reached up to 90.12%, that of packing B reached a peak at 92.96%, and that of packing C was highest at 87.21%. The contribution rate of each packing at the bottom of the device was significantly greater (p < 0.01) than that of other parts, and those of the top of the devices were all greater than those of the middle of the devices. The H2S removal rate increased with greater filler layer height. The removal rate of group B increased first with humidity, and then declined, with the optimal humidity level for the removal of H2S 50-65% in this study. With the prolongation of the run, the pH of packing A was reduced from 7.1 to 5.91, while the pH of packing B and C remained within the range of 6.53-7.10. An increase was found in the number of bacteria and fungi over time. The count of bacteria in packing B and C and following a decreasing order was bottom > middle > top, whereas that for fungi was the opposite. In conclusion, it is thought that packing B (comprising wormcast + sawdust + activated carbon) is more efficient in the removal of H2S than the other packings and may thus be utilized in biofilters. These results hope to provide useful information for future related research on the removal efficiency of H2S using packings.

IMPLICATIONS:

Wormcasts use as biological filter packing to remove H2S is limited and needs yet to be explored. A comparative study on the removal efficiency of H2S using three packings showed the packings that included wormcast were more efficient than others, and showed the combined features of physical absorption and biological removal with long sustainability and good efficiency, although these were largely influenced by environmental factors and nutrient content for the microorganisms. In summary, wormcast could be utilized in biological filters in the future in related research beacuse of its good efficiency and low cost.

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