In the work a study of the efficiency of the recovery of birch biomass from plywood production wastewater using a new developed composite coagulant, representing a polymer-colloid complex of polyethyleneimine (PEI) with polyvalent metal ions was carried out. The performance of the composite coagulant was tested using model wastewater solution (simulating hydrothermal treatment of birch wood). It was established that the optimum content of PEI in CC is 25-35% and optimal coagulation pH is 6.0. Using novel composite coagulant at optimal parameters up to 97% precipitation of total biomass, 65% removal of lignin and lignin-like substances, 92% and 43% reduction of color and chemical oxygen demand respectively can be achieved. Finally, the possibility of using the extracted biomass as an agent for dust suppression was studied. The results revealed that the precipitated biomass is able to glue the dusty sand with the formation of sandy aggregates and its shows potential application as a structuring agent for dust suppression.