Simultaneous biofiltration of BTEX and Hg� from a petrochemical waste stream

Leili, Mostafa and Farjadfard, Sima and Sorial, George A and Ramavandi, Bahman (2017) Simultaneous biofiltration of BTEX and Hg� from a petrochemical waste stream. Environmental Management 204. pp. 531-539.


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A biofiltration system was developed to treat benzene, toluene, ethylbenzene, and xylene (BTEX) and Hg� vapour from a petrochemical waste stream during overhaul maintenance. The biofilter compost bed was inoculated with a microbial consortium provided by a petrochemical wastewater treatment plant. The effect of the a BTEX concentration (192.6e973.8 g/m3h) and empty bed residence time (EBRT) of 20 e100 s were studied under the conditions of steady state, transient, shock BTEX-loading, and off-restart. The findings revealed that during a biofilter start-up, an increase in the influent BTEX concentration to around 334.3 g/m3h did not notably affect the biofiltration function at an EBRT of 100 s, and the removal efficiency was higher than 98%. Further, the low EBRT of 60 s did not have adverse effects on the BTEX and Hg� biofiltration (the removal efficiency in both was >93%). For the biofiltration system, the BTEX and Hg� critical attenuation capacity were obtained as 663 gBTEX/m3h and 12.6 gHg�/m3h respectively. A maximum attenuation capacity of 774.5 gBTEX/m3h was achieved in the biofilter when the BTEX loading rate was 973.8 gBTEX/m3h. The parameters of km and rmax of the MichaeliseMenten kinetic model were obtained as 0.099 g/m3 and 0.578 g/m3min respectively. Both BTEX and mercury vapours were completely mass balanced during a continuous biofiltration test. In general, the developed treatment system exhibited a good performance in the treatment of the BTEX stream containing Hg� vapour in the off-gas of a petrochemical company

Item Type: Article
Subjects: T Technology > TD Environmental technology. Sanitary engineering
Divisions: Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment
Depositing User: محسن زارعی
Date Deposited: 02 Jul 2018 08:58
Last Modified: 02 Jul 2018 08:58

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