Abstract: An agricultural sprayer includes an ozone supply arranged to clean at least a portion of the sprayer after a spraying operation has been completed, by supplying ozone to the residual spray liquid and to the interior of the sprayer plumbing. The ozone supply may be preceded by a rinsing or flushing of the sprayer plumbing using a rinse fluid, with the ozone injected to a circulating fluid in the sprayer plumbing. The sprayer may have an auxiliary liquid tank, such that residual spray liquid may be drained to the auxiliary tank to be cleaned using ozone. Such a cleaning operation can be performed at the same time as a further spraying operation, thereby providing for improved efficiency of operation of the sprayer.

Abstract: An agricultural sprayer including an ozone supply which is arranged to clean at least a portion of the sprayer after a spraying operation has been completed, by the supply of ozone to the residual spray liquid and to the interior of the sprayer plumbing. The ozone supply may be preceded by a rinsing or flushing of the sprayer plumbing using a rinse fluid, with the ozone injected to a circulating fluid in the sprayer plumbing. The sprayer may have an auxiliary liquid tank, such that residual spray liquid may be drained to the auxiliary tank to be cleaned using ozone. Such a cleaning operation can be performed at the same time as a further spraying operation, thereby providing for improved efficiency of operation of the sprayer.

Abstract: A method for reducing NO.sub.x emissions through the selective addition of hydrogen peroxide in the aqueous liquor of an absorber column, wherein periods of addition are determined by increases in temperature of the aqueous liquor.