Comparative analyses were made on the strategies and technologies adopted by the industrialized countries for PM2.5 emissions control during industrial development period.It is particularly recommended for China to take the experiences of 50% PM emission reduction as the target set by the Netherlands based on sufficient investigations of cost-effective strategies

corresponding to a concentration limitation of 9 mg穖-3 waste gas from industrial sources.The emitted particulate matters

from the five highest emitting sectors of basic metal

refineries

chemicals

building materials and food processing

present the peak characteristics of PM1.0 size distribution.Correspondingly the prior technologies for emission reduction are considered to be wet electrostatic precipitators or Wet-ESP alike.However they may not be a cost-effective option for China presently during the stage of basic industrial development in large scale.A novel approach of PM2.5 removal through a temperature swing array of waste-gas and waste-water multi-phase cross-flow was proposed

employing fields of velocity

temperature and concentration generated in gas phase by heat and mass transfer crossing water columns to drive micron-particle moving towards gas-liquid interfaces.Each single water column became an independent PM2.5 collection unit

which was regularly arranged in a series-parallel structure possessing high total efficiency of PM2.5 collection.An experiment set-up

consisting of a cross-flow array with unit number n=200

was examined in site of a drilling rig to collect soot PM2.5 from exhausts (4906 kg穐-1 dry mass) of a 810 kW heavy duty diesel.The total collection efficiency was 91.4% as the model predicted

while the measured efficiency was slightly over 80%.It was proven

both by theory and practice

this approach of "waste-employed waste treatment" is highly cost-effective.