Improvement of trickling biofilter purification performance on treating chlorobenzene in waste gases using surfactant
A laboratory-scale trickling biofilter column, filled with Raschig rings and inoculated with Pseudomonas putida(ATCC 1785) was used to purify chlorobenzene contained waste gases. Sodium dodecyl sulfonate (SDS) was used to enhance the performance of trickling biofilter. Purification performance of the trickling biofilter was examined for chlorobenzene inlet concentration of 1.20～5.04 g/ms at different EBRTs between 76～153 s. Without SDS addition, with simultaneous increase in chlorobenzene inlet loading rate and gas flow rate, 100% removal efficiency was achieved at EBRT of 109 s and inlet loadings below 5120 mg/m3. Addition of SDS to nutrient solution led to improvement of trickling biofilter purification performance.By introducing 25 mg/L SDS, the removal efficiency was increased by 21% and elimination capacity up to 234 g/(m3·h) was achieved at chlorobenzene inlet olading of 241 g/(m3·h).Although SDS concentration experienced a low rate reduction after continuous nutrient solution recirculation, this result has little influence on trickling biofilter's removal efficiency in monitoring period.
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