The nitrification efficiency maximized when the initial pH was 8.

The experiment is carried out on effects of municipal wastewater treatment by using biological aerated filter(BAF),and study is made on removal characters of suspended solids(SS),COD and nitrification efficiency.

Numbers and nitrification rates of heterotrophic bacteria and nitrifiers in self-purification culture of Paralichthys olivaceus;

The nitrification rates,measured under different temperatures through nitrification experiments by embedded nitrobacteria granular reactor and biological contact oxidation reactor,both reach maximum nitrification rates of 40?mg N/(L·h) and 31?mg N/(L·h) respectively at 28℃.

The experiment,adopting CSTR(continuous stirred tank reactor),through measuring the nitrification and denitrification rate as well as the phosphorus' releasing and adsorbing rates at different temperatures and pH conditions,summarizes the effects of temperature and pH on the biochemical reaction rate of activated sludge.

The influence of nitrification efficiency with adding nitrifying bacteria to the activated sludge process was investigation.

5,the average rate of nitrosation is above 80% through increasing the mass concentration of influent ammonia.

The average rate of nitrosation \[NO~-2/(NO~-2 + NO~-3)\] is above 90% by increasing the concentration of influent NH~+4-N and pH value when the salinity is in the range of 1759mg/L~.

The rate of nitrosation could exceed 50% by reducing the concentration of DO and increasing the NH_3-N concentration of the influent,but this way could not keep a steady rate of nitrite accumulation.