Suppose a sedimentation experiment is conducted using a certain wastewater with suspended matter (SS) concentration of C0. The height of the settling column is 3 m. Take samples from the middle and bottom to determine SS as C, as shown below. Settling time (min) 30 45 60 90 120C/C0 In the middle (%) 30 20 15 10 7.5C/C0 In the bottom (%) 60 40 30 20 15 (1) The sedimentation type in the settling column is _________ __ settling.(2) Assume water flow rate is 2000 m3/h. SS removal rate should be more than 85%. By the data above, the surface load of the settling tank should be ________ ___ m3/(m2h). The answer is an integral number. (Magnification coefficient is 1.5)(3) The settling area is approximately ________ _*1000 m2. (Please fill in an integer)