Pretreatment method of chemical leather DMF waste liquor rectification recovery

The invention relates to a pre-disposal method for synthetic leather DMF waste liquid rectification recovery, comprising the steps as follows: (1) first-step separation is carried out by pumping the collected DMF waste liquid from a liquid delivery pump to a coarse filter; the specification of the coarse filter is 150 to 200 meshes; (2) the DMF waste liquid which is separated in the first-step separation enters a settling centrifuge to carry out a second-step separation and the separation factor of the settling centrifuge is 3000 to 11000; (3) solid residue generated by the first-step separation and the second-step separation is burned or taken as fuel. The method has simple process and high removal efficiency of suspensions, reduces the grain suspensions in the DMF waste liquid from 1500mg/L to 150mg/L, greatly reduces the times of rectification and tower washing from once per month to twice per year, greatly reduces the loss of the DMF and the waste water generation quantity, greatly reduces the generation