Screening and Application of Nitrifying Bacteria at Low Temperature

Low concentrations of PAHs induce tolerance in nitrifying bacteria

The ability of marine microbes to develop tolerance to polycyclic aromatic hydrocarbons (PAHs) was examined in a 90-day experiment. PAH levels in sediment were increased 0.3 and 1.6 times compared to the control sediment. Day 30, 60, and 90 the microbes were re-exposed to PAHs in a short-term toxicity test to detect tolerance, where nitrification and denitrification were used as endpoints. In a...

AMMONIA OXIDATION AT LOW pH BY ATTACHED POPULATIONS OF NITRIFYING BACTERIA

Biofilm populations of Nitrosomonas europaea were formed in continuous flow sand columns supplied with defined inorganic medium containing 50 pg NH:-N ml-‘. Steady-state nitrite concentrations in effluent from the columns decreased as the pH of the inflowing medium was reduced but ammonia oxidation occurred at a pH value of 6, even though the pH minimum for growth of the organism in liquid batc...

Nitrifying and denitrifying pathways of methanotrophic bacteria.

Nitrous oxide, a potent greenhouse gas and ozone-depleting molecule, continues to accumulate in the atmosphere as a product of anthropogenic activities and land-use change. Nitrogen oxides are intermediates of nitrification and denitrification and are released as terminal products under conditions such as high nitrogen load and low oxygen tension among other factors. The rapid completion and pu...

Nitrifying bacteria in wastewater reservoirs.

Deep wastewater reservoirs are used throughout Israel to store domestic wastewater effluents for summer irrigation. These effluents contain high concentrations of ammonia (</=5 mM) that are frequently toxic to photosynthetic microorganisms and that lead to development of anoxic conditions. Population dynamics of nitrifying bacteria and rates of nitrification were studied in two wastewater reser...

Lyophilizing Foot-and Mouth Disease Virus at Low Drying Temperature