This is true for bod removal , aeration and biological growth .
这对生化需氧量的去除，充气，生物生长都是适用的。
They are commonly measured in units of biochemical oxygen demand bod , or the amount of oxygen needed to decompose them .
常常使用生化需氧量，即有机物分解所需的氧这个单位进行测量。
Luliang city southern xiaoyi yao permanganate index , cod , bod , volatile phenol , jinzhong fenhe yitang cross-section of ammonia nitrogen , datong yu he first cross-section of a small southern petroleum pollution in the habitat first in the province .
In the 97 sections for water quality monitoring , the pollution of the waters in the rivers is rather serious except the yalu river system . Over 70 % of the sections are at grade v and worse than grade v. the major pollution indicators are potassium permanganate index , bod and ammonia nitrogen .
