UASB treatment of chemical synthesis-based pharmaceutical wastewater containing rich organic sulfur compounds and sulfate and associated microbial characteristics

Weicheng Li, Qigui Niu, Hong Zhang, Zhe Tian, Yu Zhang, Yingxin Gao, Yu You Li, Osamu Nishimura, Min Yang

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

The feasibility of treating of chemical synthesis-based pharmaceutical wastewater containing rich organic sulfur compounds and sulfate using an upflow anaerobic sludge blanket (UASB) was investigated. The initial COD/SO4 2 -ratio of 8 in the wastewater varied from 5 to 1.5 after adding sulfate. Of interest that under the condition of COD/SO4 2 -at 8 and 5, despite the simultaneous generation of sulfide and hydrogen sulfide, the sulfate concentration in the effluent was higher than in the influent. This is due to the sulfur release in the form of sulfate during the degradation of these organic sulfur compounds in this reactor. Conversely, at COD/SO4 2 -of 1.5, influent sulfate was higher than effluent sulfate due to reduction of more sulfates in the reactor. At COD/SO4 2 -of 8, for practical application, the optimum OLR was found to be 8kg COD/m3/d, where a nearly 70% COD reduction occurred with biogas containing 63% methane. In this stage, the distribution of the archaea and bacterial community varied greatly with altered OLR (accompanied with prolonged operation time). Some species, such as Lysinibacillus sphaericus, Clostridium cellulovorans were expected to be partly responsible for S release from some organic sulfur compounds in the reactor. By increasing the sulfate loading at a COD/SO4 2 -ratio up to 1.5 resulted in a light inhibition of methanogenesis due to the high sulfide concentration (1212 SO4 2 -- S mg/L) with no obvious suppression of sulfidogenesis.

Original languageEnglish
Pages (from-to)55-63
Number of pages9
JournalChemical Engineering Journal
Volume260
DOIs
Publication statusPublished - 2015 Jan 15

Keywords

  • COD/SO ratio
  • Chemical synthesis-pharmaceutical wastewater
  • Organic sulfur compounds
  • UASB
  • Wastewater treatment

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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