1. A settling column analysis is run on a type -1 suspension. The settling column is 2 m tall, and the initial concentration of the well- mixed sample is 600mg/L. Results of the analysis are shown below. What is the theoretical efficiency of the settling tank that receives this suspension if the loading rate is 2 cm/min. Time (min) Concentration remaining, mg/L 600 60 550 75 420 90 325 115 210 150 120 240 50 2. A settling column analysis is run on a type -2 suspension with the following results. (Entries are suspended solids concentration at stated times.) Depth, Time, min 40 80 120 160 200 240 280 0.5 820 369 238 164 107 66 41 33 1.0 820 442 369 279 213 164 115 90 1.5 820 631 476 361 287 230 180 148 2.0 820 672 558 426 353 287 238 187 2.5 820 713 590 492 402 344 262 230 3.0 820 722 615 533 460 394 320 262 3.5 820 738 656 574 492 418 360 303 Determine the theoretical efficiency of settling basin with a depth of 3.5m, a volume of 1400m and an inflow of 11200m/d.