Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2008.920.924Thiobacillus thioparus Bacteria on Seashell Bed Biofilters]]>MassoudinejadM.R. ManshouriM. KhatibiM. AdibzadehA. AminiH. 62008116The aim of this research is to achieve an efficient and
cheap methods to remove H2S from the factories emissions. Four
serial cylinders are designed, 40 cm in height and 15 cm in diameter each.
They are filled with bivalve seashells with 63% porosity which contains
Thiobacillus thioparus bacteria to the maximum height of 27.5 cm.
By mixing phosphoric acid and sodium sulfide, H2S gas is released
and its concentration is measured as mg m-3 before injecting
into the cylinders. A permanent measuring instrument is equipped to control
the gas coming out of the cylinders. In order to prevent the outdoor environment
from pollution, first the gas is sent through two activated carbon columns
and then sent through a ferrous chloride scrubber. Finally it is burnt
directly by flames. There were 550 sample readings in 15 weeks. The changes
in thedischarge of the air which carries the gas are considered
between 1-12 L min-1 and the concentration of the influent
pollutant is considered between 1-140 mg m-3. Also the humidity
in the atmosphere is fixed between 77-93% and the optimum temperature
required for growing of the microorganisms is retained between 20.5-30 ° C.
After feeding the system for three weeks the efficiency started to increase
so that by the end of the final week of this research the efficiency reached
to 90% with the discharge of 6 L min-1 of the carrier gas.
The results achieved from this research show that because of not using
Filamentous bacteria, clogging did not occur in the biological system
in biofilters. The amount of head loss in cylinder was only 2 mm water
and during this research, head loss was the same due to unclogging of
filter. On the other hand the traditional methods are expensive in terms
of using chemicals, carbon recycling and using fuel and etc. Therefore
researchers have started new studies in this field. The above mentioned
method, according to high efficiency, inexpensiveness and easiness of
control and maintenance is considered one of the best methods.]]>Armand, L.,1994221518Deshusses, M.A. and T.S. Webster,20025019471956Baquerizo, G., J.P. Maestre, T. Sakuma, M.A. Deshusses, X. Gamisans, D. Gabriel and J. Lafuente,2005113205214Jiafa, M.,19975310111021Kim, N.J., Y. Sugano, M. Hirai and M. Shoda,200090410415Kim, H. and J.S. Chung,20022S and NH3.]]>5213891398Langenhove, H.,1986414711476Luo, J. and A. van Oostrom,19976924032410Malhautier, L., C. Graciana, J.C. Rouxa, J.L. Fanloa and P. le Cloirec,200350145153Melvin, L.,2003126834840Mosqera, M. and R. Sanchez,200235560Oyarzun, P., F. Arancibia, C. Canales and G.E. Aroca,2003Thiobacillus thioparus.]]>36165170Pomery, R.,19965415291538Satoh, H., B. Ono and H. Rulin,20043816331641Shamansouri, M.R., H. Taghipour, B. Bina and H. Movahdian,200521725Sheridan, B., T. Curran, V. Dodd and J. Colligan,200282441453Shojaosadati, S.A. and S. Elyasi,199927139144Jones, K., A. Martinez, M. Rizwan and J. Boswell,20052S removal in biofilters packed with a natural or a commercial granular medium.]]>55415420Van Lith, C., R. Michelsen and G. Leson,1997473748