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The paper presents the results of the experience of industrial wastewater reuse after cleaning from formaldehyde-containing compounds in the water supply system at a woodworking enterprise. The drains after the main stage of mechanical cleaning, cascade precipitators, were additionally settled with the addition of chemical reagents: 5% aluminium sulphate solution, 6% polyacrylamide solution and 10% sodium solution. In this case, the maximum cleaning effect was achieved by 7% higher without the use of reagents. A detailed analysis of the dry residue showed that during the processes of settling up to 28% of the dissolved resins are transferred to the solid phase, and the additional treatment with chemical reagents no longer contributes to the transition of the dissolved resins to a dispersed state. As a modification of the technological scheme of industrial wastewater treatment, two options were proposed that differ in the preliminary preparation of the effluent before evaporation.

Experience in industrial wastewater treatment of woodworking enterprise system