The release of hydrogen sulfide (H2S) during sludge drying is a major environmental problem because of its toxicity to human health. A series of experiments were performed to investigate the mechanisms and factors controlling the H2S release. Results of this study show that: 1) the biomass and activity of sulfate-reducing bacteria (SRB) in sludge were the major factors controlling the amount of H2S release, 2) the sludge drying temperature had an important effect on both the extent and the timing of H2S release from the sludge, and 3) decreasing sludge pH increased the H2S release. Based on the findings from this study, a new system that integrates sludge drying and H2S gas treatment was developed to reduce the amount of H2S released from sludge treatments.
Revised: September 18, 2015 |
Published: April 15, 2015
Citation
Weng H., Z. Dai, Z. Ji, C. Gao, and C. Liu. 2015.Release and control of hydrogen sulfide during sludge thermal drying.Journal of Hazardous Materials 296.PNNL-SA-105352.doi:10.1016/j.jhazmat.2015.04.037