해수 조건에서 총암모니아성 질소 부하량과 수리학적 공기 부하량에 따른 유동상 여과조의 질산화 성능 평가
Nitrification Performance of a Moving Bed Bioreactor (MBBR) at Different Ammonia and Hydraulic Air-Loading Rates under Seawater Conditions
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The purpose of this study was to assess the efficiency of nitrification based on ammonia loading rates and hydraulic air-loading rates in a moving bed bioreactor (MBBR) under seawater conditions. The goal was to provide foundational data for the design of these bio reactors. At an ammonia loading rate of 0.2 g TAN·m-2 surface area·day-1, the influent TAN concentration was determined to be 1.76±0.33 mg·L-1, which is below the safe concentration for fish survival (2 mg·L-1). Considering operational aspects, the optimal ammonia-loading rate was derived. Subsequently, experimental results for nitrification efficiency at the optimal ammonia-loading rate revealed that the optimum hydraulic air-loading rate was 1.8 L·air·m-2 surface area·min-1. This condition resulted in the lowest concentrations of TAN and NO2-N in the influent water, thus establishing the optimal hydraulic air-loading rate. A regression equation was derived for the ammonia-removal rate (Y) based on the ammonia-loading rate (x) and expressed as a 0.5–order equation (Y=ax0.5+b). Specifically, for TAN concentrations of 0–6 mg·L-1, the regression equation Y=0.1683x0.5-0.13628, was established.
Abstract
The purpose of this study was to assess the efficiency of nitrification based on ammonia loading rates and hydraulic air-loading rates in a moving bed bioreactor (MBBR) under seawater conditions. The goal was to provide foundational data for the design of these bio reactors. At an ammonia loading rate of 0.2 g TAN·m-2 surface area·day-1, the influent TAN concentration was determined to be 1.76±0.33 mg·L-1, which is below the safe concentration for fish survival (2 mg·L-1). Considering operational aspects, the optimal ammonia-loading rate was derived. Subsequently, experimental results for nitrification efficiency at the optimal ammonia-loading rate revealed that the optimum hydraulic air-loading rate was 1.8 L·air·m-2 surface area·min-1. This condition resulted in the lowest concentrations of TAN and NO2-N in the influent water, thus establishing the optimal hydraulic air-loading rate. A regression equation was derived for the ammonia-removal rate (Y) based on the ammonia-loading rate (x) and expressed as a 0.5–order equation (Y=ax0.5+b). Specifically, for TAN concentrations of 0–6 mg·L-1, the regression equation Y=0.1683x0.5-0.13628, was established.
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