Control of hydrogen sulphide in digestor gas using iron salts

R. Y. H. CHEUNG, D. K. C. WU, K. W. LAW, H. C. LAI, Ming Hung WONG

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1 Citation (Scopus)


Different dosages of ferrous chloride and ferric chloride were added to digestors separately, and the volumes of methane and hydrogen sulphide contained in the digestor gas (biogas) were monitored. It was noted that the effects of adding of 16, 18 and 32 kg ferrous chloride/ tonne volatile solids, and 16 and 18 kg ferric chloride/tonne volatile solids were similarly effective in controlling the hydrogen sulphide levels. According to an average amount of undigested sludge (primary sludge mixed with surplus activated sludge) of 41 tonne volatile solids produced each day during the sewage treatment process in Shatin sewage treatment works, and the required dosage of 16 kg ferric chloride/ tonne volatile solids, the amount of iron salts required should be 656 kg/day or 3.3 mg/L for the actual application, based on an average sewage flow of 200,000 m³/day. Copyright © 1996 Informa UK Limited.

Original languageEnglish
Pages (from-to)225-233
JournalToxicological and Environmental Chemistry
Issue number1-4
Publication statusPublished - Jan 1996


Cheung, R. Y. H., Wu, D. K. C., Law, K. W., Lai, H. C., & Wong, M. H. (1996). Control of hydrogen sulphide in digestor gas using iron salts. Toxicological & Environmental Chemistry, 57(1-4), 225-233. doi: 10.1080/02772249609358390


  • Co‐generation
  • Hydrogen sulphide
  • Digestion
  • Ferric/ferrous chloride


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