(a) COD of reaction tanks (24hr samples).
(b) Concentration diagram of COD (24hr
samples).
(c) Standard deviation and average COD of reaction
tanks (24hr samples).
controller. ORP meter can monitor the degree of chemical and
biological reaction, and control the condition of aeration
advanced. We can use it to control the nitrification and
denitrification process precisely, and get the high efficiency.