Method for regulating and controlling microbial community structure of system through electromagnetic wave-loading returned sludge

The invention discloses a method for regulating and controlling a microbial community structure of a system through electromagnetic wave-loading returned sludge. The method comprises the following steps: treating raw sewage by adopting an anaerobic reactor; treating the sewage, treated by the anaerobic reactor, by adopting an anoxic reactor and an aerobic reactor sequentially so as to obtain a mixed solution, and carrying out precipitation through a precipitation tank, so as to obtain supernatant and precipitated sludge; discharging the supernatant through a water outlet, dividing the precipitated sludge into two parts, taking one part as returned sludge, and discharging the other part as surplus sludge; dividing the returned sludge into two parts, subjecting one part of the returned sludge to electromagnetic wave loading, then, returning the returned sludge to the anaerobic reactor, and directly returning the other part of the returned sludge to the anaerobic reactor; regulating and controlling the microbial