Processing method for coal gasification grey water

The invention relates to a processing method for coal gasification grey water, mainly solving the problems that a precipitator in the prior art is large in scale and size as well as high in investment, occupies large area, is difficult to maintain and has high operating cost. The method comprises the following steps: a) utilizing a cripling tubulating filter to separate a clear liquid and solid particles from the coal gasification grey water; b) after the clear liquid enters a clear liquid groove, pumping the clear liquid to a recovery and utilization system; c) using the clear liquid stored in the cripling tubulating filter as a backwash liquid to automatically back wash the solid particles in the cripling tubulating filter, so as to form pumpable slurry (I) containing the mixture of the solid particles and the backwash liquid, wherein rapid cut-off valves are installed at the inlet/outlet of the filter, when the pressure difference between two sides of the filter element of the filter reaches the set value, the control device transmits signals to the valves to cause the valves to automatically switch to backwash states, and the filter automatically performs filter operation after the completion of backwash; and d) after the pumpable slurry (I) flows into a slurry groove, pumping the slurry to a slurry processing system. According to the technical scheme in the invention, the problems referred in the invention can be well solved, and the processing method can be used for industrial production of coal gasification grey water processing.