Removal Efficiency Of Styrene Research Articles

Effect of shutdown on styrene removal in a biofilter inoculated with Pseudomonas sp. SR-5

Styrene gas removal was carried out in a biofilter inoculated with a styrene-degrading Pseudomonas sp. SR-5 using a mixed packing material of peat and ceramic under the non-sterile condition. More than 86% removal efficiency was obtained at styrene load of 5–93 g m −3 h −1 for 62 days operation period and 78% carbon of removed styrene was converted to CO 2. Thereafter, three kinds of styrene shutdown experiments were conducted: (i) air and mineral medium were supplied for 4 days, (ii) complete shutdown, namely no styrene, air and moisture supply was conducted for 3 days, and (iii) only air was supplied for 11 days. When styrene gas was re-supplied after (i) and (iii) shutdown experiments, styrene removal efficiency rapidly recovered, but after (ii) shutdown, recovery of styrene removal was significantly delayed. Supply of air during shutdown period was found to be enough to resume microbial activity to degrade styrene.

Behavior of Field-Scale Biotrickling Filter under Nonsteady State Conditions

The performance of a field-scale biotrickling filter was investigated for the treatment of styrene vapors released from a bathtub manufacturing process. The two-stage biotrickling filter was operated in series with an average gas flow rate of 350 m3 h−1 corresponding to an overall empty bed gas contact time of 84 s. Daily average values of styrene removal efficiency varied from 40 to 90% with inlet concentrations ranging between 0.4 and 1.7 g m−3. System performance was not significantly affected by changes in temperature and was moderately susceptible to 3-day starvation or complete system shutdown. After 7 months of styrene treatment, toluene contaminated air was fed to the system and experiments were performed in which styrene and toluene were fed alternately at 3-h intervals. While styrene elimination remained unchanged over the cycles, the elimination capacity of toluene increased with the number of cycles, indicating some adaptation of the process culture to the new contaminant. Overall, the results suggest that biotrickling filters for air pollution control can be successful even under greatly varying operating conditions.

Effect of oxygen and water vapor on the removal of styrene and ammonia from nitrogen by non-pulse corona-discharge at elevated temperatures

The present work experimentally investigates the individual and combined effect of O 2 and H 2O vapor on the separate and simultaneous removal of styrene and NH 3 from N 2 at elevated temperatures via corona-discharge reactions. Styrene and NH 3 are chosen to represent the trace components in crematory emission because they are chemically dissimilar. Since the crematory emission always contains some O 2 and H 2O at elevated temperatures, their effects and the effect of elevated temperature are of practical interest. It is found that the presence of O 2 in N 2 always enhances the removal of styrene and/or NH 3 from N 2. The presence of H 2O in N 2 generally enhances the removal of styrene and/or NH 3 but its presence retards that of NH 3 when H 2O concentration is too high or the temperature is 300 °C. The combined effect of O 2 and H 2O is found to substantially retard the removal of styrene and/or NH 3 compared to the sole effect of coexisting O 2. The general effect of elevated temperature is to decrease the removal efficiency of styrene and/or NH 3 compared to the case of room temperature.

Preliminary test in decomposition of styrene by electron beam treatment

Abstract This project is a continuation of the experiments with VOCs electron beam treatment ( Honkonen et al., 1997 . Proc Int. Symp. on Radiation Technology for Conservation of the Environment, Zakopane, Poland, September, 1997). Experimental results of electron beam treatment of gaseous styrene under atmospheric pressure are presented in the paper. Two irradiation doses of 10 and 20 kGy were applied. Analyses of irradiation products were performed with a gas chromatography-mass spectrometer. The results showed that main products produced by irradiation were benzaldehyde and phenol. We observed those compounds both in the gas and solid/liquid phase. The removal efficiency of styrene from the gas phase ranges from 83 to 95%. In this work we focused on organic products of irradiated styrene.