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One’s views about denitrogenation disposal of sewage. By means of discarded water in the course of industrial production and consuming city life, the contamination of rivers, lakes and waters etc, is rapidly going on. It is necessary that we should prevent the contamination and turbidity of waters, and concurrently reuse sewage-disposal water. Consequently we can save economical loss and reutilize water available in several types. By secondary pollution as result of study on rich-nutrition and red-tide phenomena, that destroy mode of life and their leading cause, [i, e, N, and p], especially on denitrogenation about N. It was reached a conclusion as followings. [conclusion] 1. The process of nitration 1) In nitration, the range of optimal pH is around 7.0 2) The D. O of nitration factor requires 2.0 ~ 2.5 ppm. 3) Though, under low water temperature, the efficiency of nitration comes down, additional heating is not required inpaticular. 4) If under 0.1 ~ 0.3kg N/kg MLSS/d, the load of MLSS is proceeded more than 95% 2. The process of denitrogenation 1) In denitrogenation, the range of opimal pH is around 7.0. 2) The denitrogenation requires the orgin of organic carbon, and than, as One of organic carbon methanol, acetic acid is optimum. 3) The additional volume of the origin of organic carbon requires 2 or 3 times more than theoretical quantity. 4) The concentration of MLSS is good, if over 2.000 ppm. 5) Though the efficiency of denitrogenation cones down under low water-temperature, additional heating is not required in particular.
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