Internal Behavior of Biological Nutrient Removal System for Advanced Wastewater Treatment

Abstract

 Abstract—The purpose of this research was develop a biological nutrient removal (BNR) system which has low energy consumption, sludge production, and land usage. These indicate that BNR system could be a alternative of future wastewater treatment in ubiquitous city(U-city). Organics and nitrogen compounds could be removed by this system so that secondary or tertiary stages of wastewater treatment satisfy their standards. This system was composed of oxic and anoxic filter filed with PVDC and POM media. Anoxic/oxic filter system operated under empty bed contact time of 4 hours by increasing recirculation ratio from 0 to 100 %. The system removals of total nitrogen and COD were 76.3% and 93%, respectively. To be observed internal behavior in this system SCOD, NH3-N, and NO3-N were conducted and removal shows range of 25~100%, 59~99%, and 70~100%, respectively. Keywords—BNR, nitrification, denitrification, organics removal, anoxic, oxic, advanced treatment. I. INTRODUCTION ATER/SEWAGE facility, one of the urban base facilities constituting a city, is an important infrastructure, and to manage it the nation has a systematic system established for a long time. In the mean time, recently the nation has recognized the importance of an ubiquitous environment to lead the future society and established 'u-Korea ' plan, and each local government is expanding the promotion of u-city construction projects connected to the ubiquitous environment (1). At the same time, low-carbon green growth, a national project, and water quality standards of discharged water(2) continuously reinforced to improve the water quality of rivers has presented a new paradigm trend composed of improvement of existing wastewater treatment plants, application of advanced treatment technology and distributed wastewater treatment for tertiary treatment. Thus, cases for application of the biological nutrient removal system (BNR) have been on the rise to reduce the installation site, produce high quality treated water, and save labor and operating costs with automated operation (3). The BNR system which has been developed mainly in Europe not only can maintain SRT (4) for a long time without separate operation and make free load changes but also does not require the secondary sedimentation tank and can secure high-concentration microbes, providing due to the shorter reaction time a higher degree of intensity for site requirement than the existing suspended growth process. Thus, the BNR system is advantageous in application to wastewater treatment