This paper presents the results of a laboratory study investigating chemica
l mixing in an open channel with multiple circular turbulent jets. The expe
riments were carried out for alpha, which is the ratio of the velocity of t
he jets to that of the crossflow, varying from 8 to 16, with a combination
of coflowing and crossflowing jets and only crossflowing jets. The number o
f ports for the jets was varied for 20 to 36 and the spacing between the po
rts was varied from 12d to 24d where d is the diameter of the ports. Concen
tration measurements covered the relative distance x/d=2000, where x is the
longitudinal distance from the diffuser. The dimensionless mixing distance
alpha xm/d at which the standard deviation of the concentration field reac
hed a value of 5% was equal to 25000 where x(m) is the mixing distance. The
results indicate that a diffuser with turbulent crossflowing jets could be
an alternative to mechanical methods for achieving mixing of chemicals in
open channels in water treatment plants.