Biofiltration of air containing styrene vapor was investigated using a three-stage bench scale biofilter. The biofilter was packed with yard waste compost using hard plastics as a bulking agent in a 75:25 v/v mix of plastics: compost. The feed concentration was made by bubbling air through a styrene stock solution. The system was inoculated with thickened activated sludge and the effects of loa...

statement of problem: the elimination of actinobacillus actinomycetemcomitans (a.a) is a key factor for achieving a successful treatment in patients with aggressive periodontitis (agp) whom harboring this organism. this micro organism’s capability to invade to host’s tissues, makes its eradication with mechanical therapy (eg. flap surgery, scaling, oral hygiene) very difficult, so there is no o...

Natural and anthropogenic sources of metals in the ecosystem are perpetually increasing; consequently, heavy metal (HM) accumulation has become a major environmental concern. Human exposure to HMs increased dramatically due industrial activities 20th century. Mercury, arsenic lead, chrome, cadmium have been most prevalent that caused human toxicity. Poisonings can be acute or chronic following ...

Excessive acidification and low methane (CH4) percentage are technical challenges restricting anaerobic digestion (AD) of kitchen waste, especially under high organic loading rate (OLR) conditions. Although the contribution Fe0 powder to excessive elimination CH4 yield improvement in mesophilic AD (MAD) has been extensively reported, its impact on thermophilic (TAD) process with more frequent p...

BACKGROUND Renewable energy production is currently a major issue worldwide. Biogas is a promising renewable energy carrier as the technology of its production combines the elimination of organic waste with the formation of a versatile energy carrier, methane. In consequence of the complexity of the microbial communities and metabolic pathways involved the biotechnology of the microbiological p...