To undertake the sludge cleaning project of the aeration tank of the sewage plant, the non blocking submerged slurry pump is used for construction, and the mixing wheel and high-pressure flushing system are matched to discharge sludge and fiber impurities in high concentration. Through the field test, the technical requirements of the customer are fully met, and sludge and fiber impurities are successfully sucked and discharged, with the prominent feature of high efficiency and non blocking.