Aeration System - Diffuser System

1). Arrangement of diffuser system along width of each tank

Select TYPE B-1 Swing-Fuser Aeration & disc fuser (orifice 15/32") along width of each tanks

Total No. of disc fuser per tank = 144,  6 disc fuser / aerator tube

Select 3 rows double side Swing-Fuser aerators, aerator tube No. / row = 6,   aerator tube No. / each side of row = 3

Select 2 rows single side Swing-Fuser aerators, disc fuser No. / row = 3

Longitudinal space between center of row = L / space No. = 62 / 4 = 15.5 ft

Width space between center of row = W / space No. = 31 / 4 = 7.75 ft

2). Aerator's free air rate and head loss

Designed Air Volume per Tank(ft³/day) No. of Diffuser

(ft³ air/min)

For Single Side Aerator For Double Side Aerator

Air of double side aerators = 74 � 2 = 148 CFM

Head loss of aerators: from CFM-PSI-# chart

Gauge pressure on aerator � 15 / 33.9 = 0.44 Atm = 6.5 Psi

Single aerator head loss from chart (use7 Psi) H_single = 0.56 in H₂O

Double aerator head loss from chart (use7 Psi) H_double = 3 in H₂O = 0.1 Psi

3). Disc fuser free air rate and head

Air rate of disc fuser = Air of single aerator tube / No. of disc fuser per aerator tube

                                = 74 / 6 = 12.3 CFM

From chart CFM-Orifice-Submergence-H

H_{disc fuser} = 8.2 in H₂O = 0.3 Psi