Latvia is the biggest producer of plywood in Eastern Europe. One of the stages of raw material preparation is hydrothermal treatment of birch wood. Wastewater from plywood hydrothermal basin is characterized by the high degree of contamination. The basic contaminating components of this wastewater are lignin, hemicellulose and extractives of wood (LES), which are the main reason of a high level of chemical oxygen demand (COD) and color of water. The aim of this work is to find out the regularity of coagulation of LES with inorganic coagulants – aluminium salts in the wide range of рН and concentrations. The efficiency of LES coagulation was defined after 2 hours of the system settling and filtration. The colloidal stability and coagulation of LES in the presence of aluminium salts was studied by spectrophotometry method. It is set that at the use of Al2(SO4)3 with an optimal dose 115 mg/l and рН environment 5.0, LES educing is 81.4%. An optimal dose and рН for AlCl3 are 65 mg/l and 6.0, and here the LES educing is 82.8%. In the presence of PACl with an optimal dose of 100 mg/l and рН environment 6.0, LES educing is 79.8%. Efficiency of coagulation method is regulated by the dose of coagulant and рН environments. Correct choice of these parameters can substantially intensify the process of wastewater of hydro basin of plywood production purification based on the method of coagulation
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