PROMISING REAGENT FOR WASTEWATER TREATMENT OF WOODWORKING ENTERPRISES FROM PHENOLS

Abstract

Introduction. Woodworking enterprises are dangerous to the environment, as they are the source of phenolic waste water. Phenols are highly toxic substances (hazard class 2). Phenols in water bodies provokes deterioration of general sanitary state of water reservoir as well as depression of  life activity of living organisms and decrease of oxygen concentration in water. The process of self-purification of water from phenol is a slow one. Well-known sorption methods of waste water treatment from phenols have a number of limitations. The goal of the work is to develop a highly efficient method and technology of wastewater treatment  of wood processing enterprises from phenols with the simplified conditions of sorption with an application of magnesium-containing reagent. Objects and methods of research. The study of possible use of reagent "Аquamag-2000" for the treatment of wastewater from phenols was carried out on  a real wastewater  of ZAO "Izoplit" (Kursk region) containing 122 mg/l of phenol. The degree of purification of wastewater from phenols was determined by titrimetric method. Oxidation of water was determined by permanent residence method. Results. By passing the wastewater through the sorbent "Aquamag" 100 % removal of toxic phenol from water comes. The capacity of the sorbent for phenol is equal to 32.6 mg/g. Furthermore, decrease in the oxidation of water and the total salt content is observed. COD of waste water is reduced by 17 %, salinity -  35 %. For desorption of phenol, a 10 % NaOH solution was used, the solution was passed through the adsorption column at a speed  of 0,120 l/h for two hours. At that, a 9-fold concentration of phenol from wastewater in the form of sodium phenolate is observed. Conclusion. Based on the results of the experimental research, a method of wastewater purification from phenols using the natural magnesium-containing reagent was developed. Modernization of the technological scheme of sewage treatment of  ZAO "Izoplit" in dynamic/static conditions was offered. The modernization will improve environmental and economic performance of enterprises: to purify water from toxic phenols, to reduce or completely eliminate the fee for pollution of the hydrosphere with toxic phenols, to develop a revolving system, to reduce water consumption at a plant.