Efficacy of Anaerobic Treatment of Fur Wastewater under Different Pre-Acidification Degrees

In this research, we studied fur processing wastewater and examined the effect of acidification degree on the treatment performance of internal circulation anaerobic reactor (IC). The results showed that the acidification degree had significant effects on the removal rate of CODcr, effluent volatile fatty acid content (VFA), stability of the system and the microbial biomass of granule sludge in IC. When the acidification degree of wastewater is about 45 %, the removal rate of CODcr is more than 70 % in the anaerobic system. Although the effluent VFA is higher, there was no inhibition in acidation, the effluent ALK/VFA maintained at about 1.3, the anaerobic system run stably and well, granule sludge microbial biomass maintained at about 80% as well as in good activity. In practical engineering applications, controling the acidification degree at about 45 % can maintain the anaerobic system stable, efficient CODcr removal and the steady growth of microbial in granule sludge.