Denitrification toxic effects

NO(g), N02(g) n, IV Combustion of fossil fuels, automobiles, denitrification in soils Atmosphere Assists in production of ozone in troposphere, toxic effects on plants... 

Simultaneous removal of heavy metals and nitrate. In addition to denitrification, the above series of columns were also used for the removal of heavy metals. A decrease in the denitrification capacity of the column was used as an index of the critical heavy metal concentrations causing toxicity to the P. aeruginosa. The toxic effect of metals (lead, chromium, copper, cadmium and zinc) was examined in a separate study (unpublished data). Of these metals copper proved to have the highest toxicity as it fully prevented denitrification in a very short time at a concentration of 10 ppm. Regarding their toxic effect the next in order was lead, followed by cadmium, zinc, and chromium. 

Biological denitrification is more complex to operate because it relies on the capabilities of active bacteria, but effectively convert nitrate to not toxic chemicals (N2). It can be subject to transient states generating malfunctions and requires thus greater care. Biological denitrification produces bacteria sludge, requires chemical additives (carbon source and other nutrients for bacteria) and especially requires large installations. 

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