Question

QUESTION 3 Stabilization ponds with a total surface area of 60 000 m2 receive a wastewater flow of 530 mld with a BOD of 320 mg/l Calculate the BOD loading and the number of days of winter storage available between 0 6 m and 15 m depths Assume a water loss of 0 27 mm/d during winter months [20 marks]

Answer 1

Sivey A = G0, 000 mV Bop Q=5 30 m 130 mgle 5 30-28xo0) 513-2 m wa.ste water flow - Dx waste water floo Bon loa 320X 513, 164224000 164.024gl 17 (06m derth) = 6y 100 x0-6 = 36000 m3 volume fPu Cos 05m depth) 601000x15 = 90000 h3 Volume = 6300sh3 BoD lad Ay 6leume Sa0 loading 164. 234 63000 0-002607