Sludge concentration process and system

The invention provides a sludge concentration process and system. The sludge concentration system comprises a sludge-water separation device and a sludge compression device. The second-section spiral suction filter comprises a mixing shell, a spiral rod, filter cloth, a suction filter shell, a suction filter pipe and a suction filter box, water leakage holes are formed in the inner wall of the mixing shell, one end of the mixing shell is communicated with an outlet of the first-section spiral mixer, the spiral rod is arranged in the mixing shell, the two ends of the spiral rod are rotationally connected with the mixing shell, and the suction filter box is arranged in the mixing shell. The filter cloth is attached to the inner wall of the mixing shell and at least shields the water leakage hole, the suction filtration shell is connected to the mixing shell in a sleeving mode, the water leakage hole is communicated with the suction filtration shell, the suction filtration shell is communicated with the suction