SIZE OF STP/ CAPACITY OF SEWAGE TREATMENT PLANT (STP)

 SIZE OF STP/ CAPACITY  OF SEWAGE TREATMENT PLANT (STP)

Before We start Calculating the size and capacity of STP calculate Total Domestic / Industrial / Commercial Raw Water Demand Required as per NBC-2005, Consider 135-150 LPCD.
Total domestic (raw) water demand = TWD
Estimated Sewage X = 90 % of TWD
Estimate Sewerage X = 90/100 * TWD For Eg If TWD = 1500 KLD
Capacity of S.T.P = 90 / 100 * 1500 KLD = 1350 KLD
Space Requirement For 1350 Cum STP = let Assume, if total depth 3.30 Meter Included Free Board 300 MM (Standard Depth ) Liquid Depth L = 3.0 Meter
Size Of STP = 1350/3 = 450 =450/15 (Breadth Assumed)= 30(Width) Total Space =15x30x3= 1350 CUM