total alkalinity
1.The constitution of total alkalinity was closely related to pH value. Sulfate removal rate and the value of alkalinity could reach the highest level with pH of 6 0～6 2. Most of the alkalinity in acidogenic sulfate reducing reactor existed in the form of Ac - alkalinity but the cushion capability was controlled under the balance of H 2CO 3/HCO 3 -.
2.It is necessary to proceed the normal distribution test before Pearson correlation is applied. Seventeen factors are classified into five groups by means of cluster analysis based on Kendall rank correlation coefficient as follows:(1) total dissolved nitrogen (TDN), total nitrogen(TN ),nitrite nitrogen (NO2-N ) ,ammoniacal nitrogen (NH4-N ), alkalinity (OH), conductivity (CON ), and chemical oxygen demond (CODMn ).
