炭纤维生物膜载体在两相厌氧生物处理中的应用研究

考察并对比了聚丙烯腈基炭纤维(PAN-CF)、醛化维纶(PVA)和聚丙烯腈(PAN)纤维载体对硫酸盐还原菌和产甲烷菌的固着化能力,然后考察了它们在两相厌氧生物处理中的应用.结果表明,两种厌氧细菌在PAN-CF载体上的固着速率较快,固着量较大,固着在其表面的产甲烷菌活性更高,对硫酸盐和COD的去除能力更强,这可能与PAN-CF表面较强的疏水性及其优异的生物相容性有关;PAN-CF作为生物膜载体在两相厌氧处理含高浓度硫酸盐废水的应用中具有明显的优势,产酸相出水碳硫比大幅升高;产甲烷相COD去除率PAN-CF远高于PVA和PAN载体,约为它们的1.5~1.8倍;两相厌氧处理过程及效果受硫酸盐浓度变化的影响小,可更好地实现两相分离功能,促进有机物的生物降解.

Application of carbon fiber biofilm carriers in two-phase anaerobic biological treatment

Through comparing immobilization of sulfate-reducing bacteria and methanogen on the surface of Polyacrylonitrile based carbon fiber (PAN-CF), polyvinyl alcohol (PVA) fiber and polyacryonitrile (PAN) fiber, two kinds of bacterium on PAN-CF showed higher immobilization velocity, better biological activity and higher removal rate for sulfate and COD than on other carriers. Those results were probably concerned with high hydrophobicity and good biocompatibility of PAN-CF. The experiments,treating wastewater with high concentration of sulphate by means of two-phase anaerobic method, showed that PAN-CF as biofilm carrier had an obvious advantage: there was a big increase in COD/SO42- ratio in effluent of acidogenic phase; the COD removal ratio in methanogenesis phase was 1.5 to 1.8 times of the PVA and PAN carriers; the sulphate concentration was very little effect on the removal ability of COD in the two-phase anaerobic reaction, thus it was better to achieve the aim of two-phase separation and to advance biodegradation of COD.