| Abstract [eng] |
The wood-based manufacturing company uses a wet electrostatic percipitator, which produces wastewater (15 m3/day). Wastewater is collected in special containers and exported to be treated. Depending on the company's circular economy policy, it is desirable to separate water from existing sediment materials (sludge) from waste water and use it for other processes. The purpose of the study is to modify the process of cleaning the wet electrostatic precipitator from the chipboard and furniture manufacturing company. The study showed that the effluent treatment efficiency of 99.7 % was achieved using the flocculation method (at 1.67 mg/l SP73A flocculant concentration). The volume of sludge is 19.4%. Using a coagulation method (600 mg/l for iron (III) chloride concentration) wastewater cleaning efficiency is 96.9 % . The volume of sludge is 12.3 %. The flocculation method costs 0.34 Eur/m3 of wastewater and the coagulation method costs 2.42 Eur/m3 of wastewater, which means that the flocculation method saves 7 times its cost to clean up the wastewater. The flocculation method also uses less environmentally harmful chemical compounds. Wastewater from a wet electrostatic precipitator can be used for adhesives manufacturing. Using the flocculation method, 4409,2 m3 of water can be recycled for secondary reuse, and using a coagulation method, 4799,75 m3 of water can be reuse. |
