Isopropyl Alcohal (IPA) is flammable, clear, colorless liquid and is slightly odorous. IPA has wide applications in various industries such as paint, pharmaceutical, lithography, rubber manufacture, semiconductor, and printing industries. It is one of the components of many antiseptic and cosmetic products. The exposure of high concentrations of IPA can cause depression in central nervous syste...

The removal of volatile organic compounds (VOC) in biofilters packed with organic filter beds, such as peat moss (PM) and pine sawdust (PS), frequently presents drawbacks associated to the collapse of internal structures affecting the long-term operation. Poly(ethylene ether carbonate) (PEEC) groups grafted to these organic carriers cross linked with 4,4'-methylenebis(phenylisocyanate) (MDI) pe...

Biofiltration is an effective technology for the treatment of gaseous waste. However, a biofiltration system needs a bioreactor of large volume and it is slow to adapt to fluctuating concentrations in waste gas. To overcome these disadvantages, a bench-scale system integrating a biofilter and an adsorption unit for the treatment of gases containing o-xylene was investigated in this study. The a...

BACKGROUND The objective of this research was to investigate the kinetic behavior of the biofil¬tration process for the removal of styrene. METHODS A three stage compost based biofilter was inoculated with thickened activated sludge. The reaction order rate constants were obtained from continuous experiments and used as the specific growth rate for the Monod equation. RESULTS The measured c...

The purpose of this research was to neutralize livestock-generated ammonia by using biofilters packed with inexpensive inorganic and organic packing material combined with multicultural microbial load at typical ambient temperatures. Peat and inorganic supporting materials were used as biofiltration matrix packed in a perfusion column through which gas was transfused. Results show the ammonia r...

Mixed agricultural residue, inoculated with aerobic sulfide oxidizing microbial consortium, was used as biofilter media to study the removal efficiency (,R) of hydrogen sulfide (H2S). The effect of humidification and inlet H2S volume fraction on the performance of biofilter was also investigated. A 3.9 l bench scale biofilter was continuously operated to treat air containing H2S gas in the rang...

Recirculating aquaculture systems (RAS) are unique engineered ecosystems that minimize environmental perturbation by reducing nutrient pollution discharge. RAS typically employ a biofilter to control ammonia levels produced as a byproduct of fish protein catabolism. Nitrosomonas (ammonia-oxidizing), Nitrospira, and Nitrobacter (nitrite-oxidizing) species are thought to be the primary nitrifiers...

Biofiltration of air polluted by volatile organic compounds is now recognized by the industrial and research communities as an effective and viable alternative to standard environmental technologies. Whereas many studies have focused on solid/liquid/gas biofilters, there have been fewer reports on waste air treatment using other biological processes, especially in a solid/gas biofilter. In this...

Biofiltration is an inexpensive method of odour removal in which a contaminated air stream is passed through a moist, porous medium before being vented to the atmosphere. Contaminants are absorbed onto the surface of the medium and degraded by microorganisms. Using an air model, the odour reduction resulting from the use of a vertical, lab-scale biofilter in treating off-gases intermittently re...

A heterotrophic Arthrobacter oxydans CH8 that was capable of removing NH3 from NH3 containing gas was isolated from livestock farming wastewater. The A. oxydans CH8 was immobilized with calcium alginate packed into filter column. Metered NH3-containing gas was partially humidified and passed through the glass column. Extensive tests including the removal characteristics, the removal efficiencie...