真菌滤塔启动及降解甲苯能力研究

Biological treatments are considered to be economical and environmental-friendly for treatment process of Volatile Organic Compounds (VOCs). Hydrophilic VOCs are easily degradable while hydrophobic ones pose a great challenge for adequate treatment due to the transfer of the VOC to the liquid phase. The acidic conditions would encourage the growth of fungi as the main consortium. In this study the utilization of acidic pH is proposed for the treatment of toluene vapors, in order to investigate the elimination capacity of fungual biofilter under different toluene inlet concentration and inlet loading rates. Choosing the coking wastewater sludge, the overall start-up period is 12 days by high concentration and gas phase inoculation method. The fungual biofilter runs 2 months under pH=5, inlet concentrations: 170～7780 g/m3, inlet loadings: 14.17～756.7 g/(m3h).The removal efficiency is over 92% and elimination loadings 598.61 g/m3h under Superficial Gas Velocity 49.8m/h, inlet loadings: 14.17～648.33 g/(m3h). The fungual biofilter is able to successfully remove the high load of toluene gas, run long-term stability in the pH=5 and using NO3-N for nitrogen source.