Alleviation of metal and BTEX inhibition on BTEX degradation using PVA-immobilized degrader: kinetic model of BTEX degradation

作者：Lin Chi Wen; Wu Chih Hung; Sun Hui Chu; Chang Shih Hsien^*

来源：Bioprocess and Biosystems Engineering, 2014, 37(6): 1085-1093.

DOI：10.1007/s00449-013-1080-6

• PVA bead
• Non-competitive inhibition model
• Metal inhibition
• BTEX

Alleviation of metal inhibition on BTEX degradation using PVA-immobilized degrader (Mycobacterium sp. CHXY119) was investigated. When BTEX of 29 mg L-1 [B:T:E:X = 1:1:1:1 (mg)] was used, more than 99 % of BTEX was simultaneously degraded by the free cells within 170 h. In contrast, BTEX of 114-172 mg L-1 seriously inhibited degradation. High concentrations of metals (Mn2+: 15, Ni2+: 10, and Zn2+: 10 mg L-1) also strongly inhibited BTEX degradation by the free cells at BTEX of 29 mg L-1. Immobilization of degraders alleviated the inhibition of BTEX and heavy metals at high concentrations. A modified non-competitive inhibition model well described the BTEX degradation by the free and immobilized cells in the absence and presence of metal ions (R (2) = 0.92-0.99). The above results provide valuable information on treatment of metal-BTEX co-contaminated wastewater by the immobilized degrader.

• 出版日期2014-6