What are the advantages and disadvantages of plug-flow activated sludge process and fully mixed activated sludge process?

Push-flow: Disadvantages: the tank body is linear, with water at one end and water at the other end, which often leads to insufficient aeration at the front end (high organic matter concentration and high consumption) and waste aeration at the back end (low organic matter concentration and low oxygen consumption). In the process of denitrification, power is needed to pump digestive juice into anoxic pool; Advantages: small floor space, saving investment.

Completely mixed type: Advantages: the tank body is round, and the high-concentration influent and the low-concentration influent at the treatment end are fully mixed and diluted, and the concentration in the tank is relatively balanced. Setting aeration points can complete aerobic, anoxic and anaerobic stages in one tank; Disadvantages: large floor space, high investment and relatively low treatment efficiency.