About this Engineering article
Reductive Dechlorination of 2-Chlorophenol in a Hydrogenotrophic, Gas-permeable, Silicone Membrane Bioreactor by Chao-Chien Chang; Szu-Kung Tseng; Chih-Cheng Chang; Chun-Ming Ho is a Engineering article available to read on EtoBox.
A gas-permeable silicone membrane bioreactor was used to cultivate the biofilm under hydrogenotrophic condition for reductive dechlorination of 2-chlorophenol (2-CP). The anaerobic sludge obtained from a swine wastewater treatment plant was immobilized by polyvinyl alcohol (PVA) so as to form a biofilm on the surface of the silicone tube. After acclimating for about 4 months, the bioreactor showed a high dechlorinating performance. Under the condition of continuous feeding with 2-CP at 25 mg/l and the hydraulic retention time of 15 h, the 2-CP removal efficiency reached 92.8% (2-CP decay rate: 0.67 g/m 2 d of surface area of silicone tube). H 2 was used as electron donor for dechlorinating 2-CP, and produced the dechlorinating intermediate, phenol. Both nitrate and sulfate played important roles in inhibiting 2-CP dechlorination through different biological mechanisms. Nitrate can be easily utilized as an electron acceptor by the biofilm, while sulfate cannot. Results of this study demonstrated that nitrate competed with 2-CP as the electron acceptor, while sulfate retarded the activity of hydrogen-dechlorinating bacteria and thus inhibited the 2-CP dechlorination.
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- Author
- Chao-Chien Chang; Szu-Kung Tseng; Chih-Cheng Chang; Chun-Ming Ho
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0960-8524)
- Published
- 2003
- Language
- EN
- Field
- Engineering (Physical Sciences)