Biodegradation of PVA in an anaerobic baffled reactor

摘要

An anaerobic baffled reactor (ABR) was operated for the removal of polyvinyl alcohol (PVA). The reactor was seeded with digested sewage sludge (DSS), the acclimatization of DSS was carried out in the reactor itself influent PVA to The paper conducts pilot study on anaerobic baffled reactor treating PVA wastewater. The experimental results showed that microorganism produce certain adaptation through 30 days' cultivation , that the removal of PVA and COD was as high as 80 percent or so and that the concentration of PVA and COD in every compartment decrease gradually along the way. Moreover, the study of characteristics of sludge showed that sludge in each compartment was black, its diameter of particular varied from 0.1 mm-0.5mm, the ratio of VSS to SS was 0.25 and that F420 increase depending on the elongation of time, which showed that the addition of PVA was conducive to the retention of methanogenic bacteria. In addition, quantity of acidogenic bacterium in the first compartment is as high as 109, which played an important role in the decomposement of PVA. At the same time, the content of silicon in the first two compartments relatively high, in contrast, the content of Ca, Fe, S is so in the other two compartment. Finally, it had been found that sludge in the first compartment is loose on its surface and holes within it crossed together and acidogenic bacteria was dominant. On the contrary, mathanothrix was so in others.