Nitrogen cycling streams

Tank, J. L., J. L. Meyer, D. M. Sanzone, P. J. Mulholland, J. R. Webster, B. J. Peterson, W. M. Wolheim, and Leonard, N. E. 2000. Analysis of nitrogen cycling in a forest stream during autumn using a 15N-tracer addition. Limnology and Oceanography 45 1013-1029. 

The catalyst lifetime is predicted to exceed 15 months based on the laboratory pilot-plant experience. The catalyst can be regenerated off-stream in situ by burning the coke deposited on it by controlled combustion with a nitrogen cycle and small air makeup. 

Environmental Fate. Ammonia combines with sulfate ions in the atmosphere and is washed out by rairtfall, resulting in rapid return of ammonia to the soil and surface waters. Ammonia is a central compound in the environmental cycling of nitrogen. Ammonia in lakes, rivers, and streams is converted to nitrate. 

Effects of wastewater treatment plant discharge on the ecology of bacterial communities in the sediment of a small, low-gradient stream in South Australia, and the quantification of genes involved in the biogeochemical cycling of carbon and nitrogen [167]... 

Despite the considerable body of knowledge now available on the extraction chemistry of ruthenium, it remains a problematic element for fuel reprocessors. A variety of means10 may be used to render the ruthenium less extractable. These include the addition of reagents such as oxalate or thiourea, the oxidation of Ru111 to inextractable RuIV or the addition of nitrogen dioxide to retain more Ru(NO) 3+ in the form of nitrito complexes of low DRu. However, such treatments may have undesirable effects on plant operation. It is possible to attain high decontamination factors for ruthenium over several process cycles, the penalty being that the ruthenium will appear in several waste streams, not just the HAW from the first decontamination cycle. 

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