维生素B12对厌氧污泥还原降解8:2FTOH的影响

研究了投加生物催化剂维生素B₁₂（VB₁₂）对厌氧活性污泥还原降解8：2氟调聚醇（8：2FTOH）的影响.结果表明，投加VB₁₂能够改变厌氧活性污泥还原降解8：2FTOH的动力学特性并增加其最终去除率，但投加量存在上下限：当VB₁₂投加量≤1mg/L时，8：2FTOH最终去除量无显著增加；当VB₁₂投加量≥5mg/L时，8：2FTOH最终去除量也不再持续增加.投加所有剂量的VB₁₂均可显著增加8：2FTOH的最终脱氟率.投加VB₁₂对厌氧活性污泥还原降解8：2FTOH去除率和脱氟率的影响并不一致.此外，投加较高浓度的VB₁₂可以抑制厌氧污泥还原降解8：2FTOH过程中多氟代化合物等中间降解产物的积累，提高全氟代化合物等终态降解产物的产率，同时有利于增加8：2FTOH的矿化脱氟率，但却导致了更低的总物质的量回收率.

Influence of vitamin B12 on the reductive degradation of 8:2FTOH by anaerobic activated sludge

The influences of vitamin B₁₂ (VB₁₂), a biocatalyst, on the reductive degradation of 8:2fluorotelomer alcohol (8:2FTOH) in anaerobic activated sludge were investigated. VB₁₂ could change the dynamic characteristic of reductive degradation of 8:2FTOH by anaerobic activated sludge and enhance the final removal rates of 8:2FTOH, but there were the upper and the lower dosage limits for the VB₁₂. The final removal rates of 8:2FTOH in anaerobic activated sludge could not be enhanced while the spiked dosage of VB₁₂ was less than or equal to 1mg/L, but no further improvement was also observed when the VB₁₂ concentration was increased to more than or equal to 5mg/L. The final defluorination rates of 8:2FTOH could be significantly inhenced with spiking all VB₁₂ dosages in the present study. The influences of VB₁₂ dosages on the removal rates and defluorination rates of 8:2FTOH in the anaerobic activated sludge were inconsistent. In addition, when the anaerobic activated sludge was amended with the higher concentrations of VB₁₂, the accumulation of intermediate degradation products (i.e. polyfluorinated compounds) was generally inhibited and the lower total molar recoveries of 8:2FTOH were observed while the molar yields of final degradation products (i.e. perfluorocarboxylates), as well as the mineralization defluorination rates of 8:2FTOH, were enhanced.