In many cases, it is extremely difficult for the dust scrubbers to catch submicron particles. It needs that those are collected perfectly in social environment. The authors tried and succeeded to improve the scrubber performance with steam injection into a wet dust one in M company. The aim of this study is to investigate the collection mechanism. In this report effects of particle size is described. Experimental evidence shows that the talk as particles do not improve the scrubber performance with steam injection but the whitecarbon remarkably.