a 1. The results from a settling column test performed on a municipal sewage from a certain town were as presented below. The experiments were conducted on a sample of sewage which is sieved through a 1.30 mm mesh to remove gross solids that would block valves. 501 of the sample weighed 1.420 gm. After drying. Sampling Experimental results for amount of SS remaining in the sample (mg/l) Time Sampling depth (cm) (min.) 100 200 300 400 0 230 230 230 230 60 150 150 159 157 180 118 143 147 152 360 90 115 134 145 The sewage treatment work incorporates two primary settlement tanks each of a diameter of 15 m. The sewage flow to the tanks is 0.25 m3/s. Find the percentage expected SS removal at the works