Removal of ethanethiol using a biotrickling filter with nitrate as an electron acceptor


Shihab M. S. , Alp K., Turker M., Akmırza İ., Mhemid R. K.

ENVIRONMENTAL TECHNOLOGY, vol.41, no.13, pp.1738-1752, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 41 Issue: 13
  • Publication Date: 2020
  • Doi Number: 10.1080/09593330.2018.1545804
  • Journal Name: ENVIRONMENTAL TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Agricultural & Environmental Science Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Communication Abstracts, EMBASE, Environment Index, Geobase, Greenfile, INSPEC, MEDLINE, Metadex, Pollution Abstracts, Veterinary Science Database, DIALNET, Civil Engineering Abstracts
  • Page Numbers: pp.1738-1752
  • Istanbul Technical University Affiliated: Yes

Abstract

Many studies have discussed the biotreatment of ethanethiol (ET) under aerobic conditions. However, O-2 free conditions offer bio-conversion of ET gas into elemental sulphur and/or sulphate using as electron acceptor, and this has been not studied. In this study, an anoxic biotrickling filter was tested in lab-scale conditions with ET/ ratio 0.74 and 0.34 mole/mole to remove malodorous ET waste gas. The study examined the effect of three operational parameters: ET inlet concentrations (150, 300, 800, and 1500 mg/m(3)), trickling velocities (0.12, 0.18, 0.24, 0.3, and 0.45 m/h), and empty bed residence times (30, 60, 90, and 120 s). It found that the effect of trickling velocity on removal efficiency depended on inlet concentrations; 0.24 m/h trickling velocity resulted in efficient ET removal (higher than 90.8% for 150 mg/m(3) of inlet concentration) while 0.45 m/h trickling velocity could only achieve a removal of 80.6% for 1500 mg/m(3) of inlet concentration at fixed EBRT 60 s. Increasing the EBRT up to 60 s was adequate to achieve removal efficiency, i.e. 92 and 80% for ET inlet concentrations 150 and 1500 mg/m(3) respectively, and the maximum elimination capacity was 75.18 g/m(3)/h at 0.45 m/h. Overall, the anoxic conditions enhanced the low oxidation rates of ET in an anoxic biotrickling filter despite mass transfer limitations and poor solubility of ET.