Wastewater treatment self-control method

In the wastewater system in the invention, a mechanical grid runs at regular time to clean up large impurities in raw water and prevent the water pump and pipeline from blocking; and aeration and drainage are performed according to the preset program and the amount of wastewater in a two-way two-pole CASS pool, thus the wastewater system is in an automatic operation state completely. The whole wastewater treatment technology does not require the dosing system, thus the operating cost can be greatly reduced. The operation of the wastewater system is stable, the wastewater treatment capability is increased, the chemical oxygen demand (COD) value is reduced from 120mg/L to about 60mg/L; and the degree of automation is increased, the wastewater system is only required to be inspected daily and the labor intensity is reduced.