This paper aims to study destroying process of phenol, COD, color in coke wastewater by ozone process. All experiments were conducted in the bath type reactor on phenol solution prepared in lab. The results showed that removal efficiency of the phenol, color and COD were high relatively. | Vietnam Journal of Science and Technology 55 (4C) (2017) 271-276 STUDY ON PRE-TREATMENT OF THE PHENOL, COD, COLOR IN THE COKE WASTEWATER BY OZONATION PROCESS Nguyen Thanh Thao1, 3, *, Trinh Van Tuyen1, Le Truong Giang2 1 Institute of Environmental Technology, VAST, 18 Hoang Quoc Viet, Ha Noi 2 Instutute of Chemistry, VAST, 18 Hoang Quoc Viet, Ha Noi 3 Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Ha Noi * Email: thao7980@ Received: 1 August 2017; Accepted for publication: 17 October 2017 ABSTRACT This paper aims to study destroying process of phenol, COD, color in coke wastewater by ozone process. All experiments were conducted in the bath type reactor on phenol solution prepared in lab. The results showed that removal efficiency of the phenol, color and COD were high relatively. Experiments were realized in the different conditions: phenol concentration: 260; 500 and 720 mg/L; COD corresponding 610; 1200 and 1700 mg/L; inlet ozone concentration from to g/ to study the effect of pH, rotary of magnetic and phenol concentration. The main results showed that phenol removal efficiency was of 98 %; COD of 75 % after 22 minutes of reaction at ozone dose for initial phenol 260 mg/L. Ozone treatment has highest treatment efficiency with phenol but reduction rate of COD was much slower than phenol. Keywords: ozone, phenol, coke wastewater. 1. INTRODUCTION In Viet Nam, coke production is increasing rapidly to demand usage of manufacture of industries as coal power plants, steel. Coke wastewater contains considerable amount of toxic compounds such as COD, phenol, color, CN- as well as high concentration of ammonium nitrogen and chlorides, though low concentration of heavy metals and phosphorus. Pre-treatment of coke wastewater with high phenol concentration have been cared especially. Ozone is one of the Advanced Oxidation Processes (AOP) widely used for industrial wastewater treatment. Especially, ozone is a .
