Release and control of hydrogen sulfide during sludge thermal drying.
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, by which 97.5% of H2S and 99.7% of smoke released from sludge treatments was eliminated.
Institute of Environment & Biogeochemistry, Zhejiang University, Hangzhou 310027, PR China. Electronic address: gswenghx@zju.edu.cn.
Huanxin
H
Weng
Institute of Environment & Biogeochemistry, Zhejiang University, Hangzhou 310027, PR China.
Zhixi
Z
Dai
Institute of Environment & Biogeochemistry, Zhejiang University, Hangzhou 310027, PR China.
Zhongqiang
Z
Ji
Institute of Environment & Biogeochemistry, Zhejiang University, Hangzhou 310027, PR China.
Caixia
C
Gao
China University of Geosciences, Wuhan, PR China; Geochemistry, Fundamental and Computational Science Directorate, Pacific Northwest National Laboratory, USA. Electronic address: chongxuan.liu@pnnl.gov.
Chongxuan
C
Liu
D000393:Air Pollutants / Q000032:analysis*; D018533:Biomass; D006862:Hydrogen Sulfide / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology; D016999:Sulfur-Reducing Bacteria / Q000254:growth & development; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods* / Q000592:standards
D000393:Air Pollutants; D012722:Sewage; D006862:Hydrogen Sulfide
H(2)S release; Sewage sludge; Sludge drying; Sulfate-reducing bacteria (SRB)