Simultaneous anaerobic and aerobic degradation of synthetic dyes by immobilized cells containing Shewanella sp. NTOU1

• Main Authors: Jei-Kai Tan, 譚家凱
• Other Authors: Shiu-Mei Liu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/79415344854560518282

碩士 === 國立臺灣海洋大學 === 海洋生物研究所 === 95 === Textile wastewaters were toxic and caused serious environmental problems. Previous studies had shown that decoloration of synthetic dyes, especially azo dyes can be achieved by using reduction of these dyes under anaerobic conditions. However, the intermediate,aromatic amines, produced from reduction of these dyes are generally not degraded and accumulated under anaerobic conditions, but could be degraded under aerobic conditions.Based on this metabolism, sequencial batch water system had been established to that waste water efferent containing azo dyes. In this study, we made immobilized beads with Shewanella sp. NTOU1 in an attempt to degrade three kinds of synthetic dyes(Azo, Triphenylmethane and Anthraquinone dyes)inside the beads which were under anaerobic conditions and degrade their intermediates(Aromatic amine) outside the beads which were under aerobic conditions. We expected to make simultaneous anaerobic and aerobic degradation of synthetic dyes in aerobic or microaerophilic environments. In optimum conditions, more than 90% of these dyes(100 ppm)could be removal in 24 hours. Benzidine, the intermediates could be degraded in next 10 days and the other intermediates Aniline, could be degraded after 28 hours. The degradtion product of RB-19, 1,4 - dihydroxy- 9,10 anthracenedione could be degraded after 10 days. These immobilized beads showd very high durability and stability. Compared with the two stage anaerobic-aerobic treatment system and normal wastewater treatment system, these immobilized cells have higher applicability and efficiency in textile wastewaters treatment.