ABSTRACT It was previously demonstrated that microbial communities of pig manure were composed both bacteria and archaea. Recent studies have shown are aerosolized from manure, but none ever focused on the airborne archaeal burden. We sought here to develop apply molecular ecology approaches thoroughly characterize archaea swine confinement buildings (SCBs). Eight operations visited, twice in winter once during summer. Institute Occupational Medicine cassettes loaded with 25-mm gelatin...

Hypersensitivity pneumonitis of machinists associated with metalworking fluids (MWF) was recently linked to Mycobacterium immunogenum. In addition Mycobacterium, impacts continuous and massive contact other micro-organisms, such as Pseudomonas, were little studied. This report intended quantify characterize the microbial load 44 in-use MWF.The main biodiversity MWF assessed using cultural methods, quantitative PCR (qPCR) denaturing gradient gel electrophoresis (DGGE). Total bacteria...

Environmental issues associated with swine production are becoming a major concern among the general public and thus an important challenge for industry. There is now renewed interest in environmental biotechnologies that can minimize impact of add value to livestock by-products. An anaerobic biotechnology called psychrophilic digestion (PAD) sequencing batch reactors (SBR) has been developed at Agriculture Agri-Food Canada. This very stable recovers usable energy, stabilizes deodorizes...

Air quality in workplaces is a main concern for industrial hygienists and occupational health specialists. Aerosolization of microorganisms or their by-products from contaminated material can significantly decrease the air expose workers’ to potentially harmful effects. To identify risks elaborate safe exposure thresholds, microbiology samples must be characterized, which means airborne identified quantified. This review summarizes, nonbiologist specialists, principal sampling analysis...

Respiratory problems are observed in machinists using soluble metalworking fluid (MWF). Evidences suggest that these could be related to the aerosolized microorganisms and their byproducts from MWF. To establish MWF aerosol exposure thresholds better understand effect on human health, aerosols must fully characterized. This article evaluates airborne working environment. Air quality parameters (endotoxin levels, culturable microorganisms, mist, inhalable dust air exchange rates) were...

A low-temperature (25 degrees C) anaerobic eight-compartment (PF01 to PF08) cascade reactor simulating a plug-flow (PFR) treating pig manure was monitored for year. The bioreactor fed at an average loading rate of 2.4 +/- 0.2 g total chemical oxygen demand (TCOD) per litre day theoretical hydraulic retention time (HRT) 67 7 d. An 79% TCOD removed from (converted into biogas and in sediments), whereas specific methane yields ranging 397 482 NL CH4 kg(-1) VS (148.6 171.4 TCOD) were obtained....

Haloacetic acids (HAAs) are disinfection by-products formed as a result of the reaction between chlorine and natural organic matter found in water. HAA concentrations have been observed to decrease at distribution system extremities. This is associated with microbiological degradation by pipe wall biofilm. The objective this study was evaluate drinking water presence biofilm identify factors that influence degradation. Degradation dichloracetic acid (DCAA) trichloroacetic (TCAA) simulated...

Bacterial community structure and composition of a drinking water network were assessed to better understand this ecosystem in relation haloacetic acid (HAA) degradation identify new bacterial species having HAA capacities.Biofilm samples collected from model system, simulating the end distribution supplied with different concentrations dichloroacetic trichloroacetic acids at periods over course year. The analysed by culturing, denaturing gradient gel electrophoresis (DGGE) sequencing. Pipe...

Bélanger, G., Savoie, P., Parent, Claessens, A., Bertrand, Tremblay, G. F., Massé, D., Gilbert, Y. and Babineau, D. 2012. Switchgrass silage for methane production as affected by date of harvest. Can. J. Plant Sci. 92: 1187–1197. (Panicum virgatum L.) is a warm-season grass recognized potential biomass crop energy in North America, but little information exists on the effect harvest forage characteristics switchgrass grown eastern Canada. Our objectives were to determine how affects several...

Reed canarygrass (Phalaris arundinacea L.) is a potential biomass crop for energy production but little known on its optimum management in the northern areas of North America. We determined effect three harvest dates (late July, early September, and mid-October) one-cut system four N fertilization (0, 40, 80, 160 kg ha −1 ) silage characteristics reed seeded 2007, harvested ensiled 2008 2009 following spring applications. Delaying from late July to mid-October decreased dry matter (DM) yield...

Biofiltration on organic media is used in many wastewater applications. However, no tools are available to survey the microorganisms' activity inside process. The acetylene blockage technique was adapted evaluate potential denitrifiers' activity. objectives of this work were adapt and verify applicability method by evaluating its sensitivity variability. A closed cell built installed an open network where pure gaseous nitrogen had been successively injected at fixed rate filtering samples. N...

Abstract BACKGROUND: Nitrogen removal by organic biofilters treating pig manure is incomplete and has to be optimized. This could achieved promoting the activity of denitrifiers, this being limiting factor for nitrogen in kind process. However, changing operating conditions impair nitrification; no data are currently available about distribution nitrifiers biofilters. A better knowledge process colonization needed determine their potential oxidize ammonia whether they share same physical...

Abstract L'opération de systèmes biofiltration à support organique nécessite le développement méthodes suivi simples et rapides La respirométrie type LSS a donc été adaptée afin d'évaluer l'activité potentielle des organismes hétérotrophes présents dans biofiltre. Des essais respirométriques ont réalisés différentes concentrations milieu filtrant d'adapter la méthode cette biomasse, fixée sur support. colonnes laboratoire montées alimentées charges hydrauliques massiques variables durées...