The advantages and disadvantages of anaerobic activated sludge process and aerobic activated sludge process for wastewater treatment were compared.

Anaerobic advantage: basically no power consumption; Can be suitable for treating high-concentration wastewater; Energy that can produce biogas; Low sludge yield and low sludge treatment cost; It can treat wastewater with high surfactant content without foaming.

Anaerobic disadvantages: the effluent can not meet the standard directly and needs further aerobic treatment; Anaerobic removal of ammonia nitrogen pollutants is basically inefficient, and it will consume too much carbon source, which increases the difficulty of aerobic treatment of nitrogen removal.

Aerobic advantages: it can be directly treated to meet the standard, and the effluent is odorless and clear;

Disadvantages of aerobic: high power consumption, high sludge output, easy to appear foam, sludge expansion and other problems.