DEPHENOLIZATION OF GEOTHERMAL WATERS BEFORE DISCHARGING INTO SURFACE WATERS

Abstract

Abstract. Aim. Dephenolization of geothermal waters before discharging into open reservoirs. Methods. Technological solutions are proposed for utilization of spent geothermal phenol-containing waters by using ozone and activated carbon for solving the purification problems. The evaluation of the efficiency of the proposed technologies is carried out with obtaining of the field and experimental physical and chemical data. Results. In recent years, Russia has seen a decrease in volumes and a reduction in the use of high-potential geothermal resources containing phenols. Studies have been carried out on the purification of phenol-containing geothermal waters of the Kizlyar, Ternair and other deposits of the Republic of Dagestan, depending on the dose of ozone, the time of ozone treatment, water temperature and pH. It has been shown that, after combined treatment using ozone and activated carbon, spent thermal waters containing phenol up to 15 mg/l can be discharged into open reservoirs without damage to the environment. Conclusions. Solving the problems of utilization of spent phenol-containing geothermal water will allow involving huge reserves of geothermal already drilled wells in the economic activity. At the same time, the cost of the heat potential of thermal waters will be much lower than using natural gas or other heat carriers.