The amount of sewage entering the aeration tank at twelve o'clock is relatively small at night, the concentration is higher, and the light refractive index is greater.
The amount of sewage entering the aeration tank at 12:00 is relatively small at night, with higher concentration and greater light refractive index.<br>
However, the amount of sewage entering the aeration tank at 12 o'clock is smaller than that at night, with higher concentration and higher light refractive index.