生物滤器是海水养殖废水净化的核心处理单元,而气水比是影响移动床生物滤器处理效率的关键因素.本实验采用挂膜成熟的移动床生物滤器和人工模拟海水养殖废水,研究了不同气水比(6:1、10:1、15:1、20:1、30:1)对移动床生物滤器处理海水养殖废水效能的影响.结果表明:随着气水比的增大,氨态氮(TAN)去除率呈现出先降低后增加的趋势,亚硝酸盐(NO2--N)的积累率呈现出先增加后降低的趋势,化学需氧量(COD)去除率呈现降低的趋势.气水比为6:1时TAN和COD平均去除率最大(TAN 12.55％±0.80％,COD 16.63％±1.28％),NO2--N平均积累率相对较小(109.71％±23.94％),且出水水质稳定,波动最小,对水质的净化效果明显好于其他的气水比条件,因此气水比6:1是实验条件下的最佳气水比,可为实际生产应用提供理论参考.%The biological filter is the central unit in recirculating aquaculture systems (RAS) and the gas-water ratio is the key factor that influences the treatment efficiency of moving bed biofilm reactors. To determine the best gas-water ratio, in this paper, we evaluated the effect of the gas-water ratio on the purification efficiency in a ma-ture moving bed biofilm reactor. We investigated the removal rates of total nitrogen (TAN), accumulation rates of nitrite (NO2--N), and chemical oxygen demand (COD) at different gas-water ratios (6:1, 10:1, 15:1, 20:1, 30:1). The results showed that as the gas-water ratio increased from 6:1 to 30:1, the TAN removal rate first increased and then decreased, whereas the accumulation rate of NO2--N first decreased and then increased. The gas-water ratio of 6:1 was associated with a better treatment efficiency than other gas-water ratios, with the best removal rates for TAN (12.55％ ± 0.80％), COD (16.63％ ± 1.28％), and the relatively lowest NO2--N (109.71％ ± 23.94％) accumulation rate. Our results provide a reference for the optimization of moving bed biofilm reactors in industrialized production.
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