To address the challenge of handling high moisture content sediment sludge in the solid liquid separator of pond Juanyang mode, this study conducted dewatering experiments using a "coagulation + plate and frame filtration" approach. Initially, Poly Aluminum Sulfate (PAS), Poly Silicate Aluminum Ferric (PSAF), and Poly Ferric Sulfate(PFS) were selected as experimental factors for sludge coagulation tests, with sludge specific resistance (SRF) and pollution properties of filtrate as experimental indicators. Subsequently, factors such as types of filter cloth, dosage of the selected coagulant, filtration pressure, and dwell time were considered for plate and frame filtration dewatering experiments on sediment sludge, with sludge dewatering rate (DR) and pollution properties of filtrate as experimental indicators. Experimental results revealed that PAS, PSAF, and PFS exhibit significant conditioning effects on the sludge. The optimal effect is achieved when the PSAF dosage is 2% of the dry mass of the sludge, resulting in a reduction of sludge specific resistance by 97.43% to 2.08×10^12m/kg, with the Nemerow index of filtrate was 3.61. Plate and frame filtration demonstrated good dewatering performance on the sludge conditioned with PSAF. By using polyester 621 filter cloth, a 2% addition rate of PSAF of the sludge dry mass, a filtration pressure of 0.3 MPa, and and a dwell time of 10 minutes, the plate and frame filtration achieved effective dewatering, reducing the sludge moisture content to 70.98% and a dewatering rate of 80.94%, with the Nemerow index was 4.54. Therefore, the approach of plate and frame filtration after PSAF conditioning can serve as an effective dewatering technique for sediment sludge in pond Juanyang systems, aiming to reduce sludge volume for easier transportation and storage.