In this study, a laboratory-scale biotrickling filter (BTF) is used to remove Triethylamine (TEA) from gaseous wastes. The BTF is made of stainless steel with a height of 210 cm and an internal diameter of 21 cm packed with lava rocks. TEA elimination pattern was evaluated by changing empty bed residence times (EBRTs). The maximum elimination capacity (EC) has been determined to be 87 g/m 3 /h. At all EBRTs 52, 31, 20, and 10 s, contaminant transferring from gas phase to liquid was more than the EC. Also, the removal efficiency was 100 % for a mass loading of 100 g/m 3 /h. While the liquid recirculation velocity of 3.466 m 3 /m 2 /h was maintained, the flow rate was adjusted to 60, 100, 156, and 312 L/ min. The results show that due to the high solubility of TEA in water for all the EBRTs, TEA can be solved in the circulated liquid and then be degraded gradually by microorganisms. Therefore, the least EBRT of 10 s is more appropriate.
Volatile organic compounds (VOCs) are released continuously into the indoor environment from a number of sources including building materials, furnishings and household products like air fresheners. In addition there are many activities carried out in houses that release VOCs intermittently. However, a major contributor to indoor pollution, particularly in large cities, is the outdoor environment largely through the concentration of vehicular traffic. In the present study, conducted in Tehran, the group of gasoline components commonly known as BTEX were measured as a surrogate for this pollution under different conditions in the indoor environment. Using a method published by NIOSH, organic vapours were collected by drawing air through charcoal-filled tubes with a portable pump with a flow rate of 0.2m3.min 1. Organic material from the collected samples was eluted from the charcoal tubes by carbon disulphide and the BTEX component analysed by Gas Chromatography. The results showed that proportionally high levels of BTEX were present in the VOC profile and it was concluded that petroleum and its combustion products were major contributors to indoor pollution in Tehran. Also, the concentration of benzene was especially high, being some 2-4 times greater than the maximum levels recommended by many countries.
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