Investigating the impact of dissolved oxygen concentration on nitrogen treatment in cruise ship wastewater using A/O technology

Abstract

The majority of cruise ship wastewater comes from toilets and has a low COD/N ratio, making it difficult to remove TN. QCVN 100:2018/BGTVT applies stricter requirements, especially for TN standards. Examining the application of an A/O model in aerobic tanks to treat cruise ship wastewater under different DO conditions. The results showed that TN treatment efficiency for DO conditions 3 – 3.5 mg/l, 2 – 2.5 mg/L, and 1 – 1.5 mg/L was equal to 37.66%, 52.51%, and 70.24%, respectively. According to research, in order to remove TN to meet QCVN 100:2018/BGTVT, DO in aerobic tanks should be controlled at concentrations of 1 - 1.5 mg/L, and Carbon should be added to increase treatment efficiency and stabilize output water quality.        

DOI: https://doi.org/10.53818/jfst.02.2024.465