| 摘要: |
| 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。 |
| 关键词: 移动床生物滤器 海水养殖废水 气水比 净化效能 |
| DOI：10.11759/hykx20161229002 |
| 分类号: |
| 基金项目:国家自然科学基金(31472312, 41306152, 31402283); 国家科技支撑计划(2014BAD08B09); 江苏省重点研发计划(BE2015325); 青岛市海洋经济创新发展示范城市重点项目-工业化循环水高效智能养殖装备产业链协同创新与构建项目 |
|
| Effect of gas–water ratio on removal efficiency of marine aquaculture wastewater in moving bed biofilm reactor |
|
MA Xiao-na,LI Xian,ZHANG Yan-qing,WANG Bo,LI Meng,LIU Ying
|
| Abstract: |
| 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 mature 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. |
| Key words: aquaculture wastewater moving bed biofilm reactor gas–water ratio treatment effect |
