Improvement of trickling biofilter purification performance on treating chlorobenzene in waste gases using surfactant

Abstract

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/m 3 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/m 3 . 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/(m 3 ·h) was achieved at chlorobenzene inlet loading of 241 g/(m 3 ·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.

The effect of betaine on the removal of toluene by biofiltration

“…A betaine solution was added to the filter bed at the consecutive concentrations: 1.0, 2.0 and 3.0 g/dm 3 . The solutions were [23] Triton X-100 Toluene Sówka et al [24] β-Cyclodextrin Toluene Cheng et al [25] SDS n-Hexane Tu et al [26] Saponins n-hexane Wang et al [27] Tween 20 Ethylbenzene Cheng et al [28] Biosurfactants α-Pinene Song et al [29] Triton X-100 Styrene Ramirez et al [ [32] Triton X-100, Tomadol 25-7 n-Hexane Park et al [33] LA5, LA7, Span 20, Tween 20, Tween 81 Toluene Liu et al [34] SDS Chlorobenzene Dhamwichukorn et al [35] Triton X-100, Brij 35, Brij 58 α-Pinene, methanol Kastner et al [36] Pluronic F68 n-Hexane Kim et al [37] Alfonic 810-60 Trichloroethylene, tetrachloroethylene…”

Effect of (bio)surfactant type and concentration on the gas-liquid equilibrium partitioning of hydrophobic volatile organic compounds

“…toluene, ethylbenzene, m-xylene, cyclohexane, pentane, hexane and heptane. The synthetic surfactants were selected as model compounds given their bulk and commercial availability, their difference in charge of the head groups, and their previous application in biofiltration systems [23][24][25]. The biological surfactants were selected because they are known to be less toxic and more environmentally friendly [26].…”