samllh
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于 2003-10-15 14:00 ![把文章內容复制到剪貼板。
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The key is OXYGEN. Like I said before: Thiobacillus denitrificans "Sulfur denitrification is based upon autotrophic denitrification by sulfur oxidizing bacteria such as Thiobacillus denitrificans and Thiomicrospira denitrificans. Under aerobic conditions these bacteria use oxygen as an electron acceptor, but under anoxic conditions they oxidize reduced sulfur (S2-, S2O32-, S0) to sulfate while reducing nitrate. In addition to nitrate, T. denitrificans can also use nitrite, NO or N2O as an electron acceptor ." If the amount of bacteria is NOT enough, bacteria has greater chance to use oxygen and produce NO2 from nitrogen compound. If the amount of bacteria is enough, around 4 weeks later, there will not be enough oxygen for the bacteria. Then more bacteria will be under anaerobic condition and all NO, NO2 and NO3 will be consumed by the bacteria.
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