| 海水生物滤器氨氮沿程转化规律模型 |
| 摘要点击 3069 全文点击 1367 投稿时间：2011-11-16 修订日期：2012-03-12 |
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| 中文关键词 海水养殖废水 生物滤器 水力停留时间 氨氮转化 数学模型 |
| 英文关键词 marine aquaculture wastewater biological aerated filter(BAF) hydraulic retention time (HRT) ammonia transformation mathematic model |
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| 中文摘要 |
| 生物滤器是海水循环水养殖系统中的核心水处理单元,其主要用于去除对养殖生物有害的氨氮、有机物等. 本研究基于吸附原理和一级反应生物膜理论构建了氨氮在生物滤器中沿程转化规律的数学模型,并通过实验加以验证. 实验所用生物滤器采用竹制空心生化球填料,装填高度为70 cm,在pH为7.1~7.6,DO为5~7 mg·L-1,气水比20 ∶1左右,有机负荷约为4 g· (m3·h)-1,水力停留时间(HRT)为1 h条件下,生物滤器中氨氮的去除主要发生在填料高度0~10 cm处,10~70 cm处氨氮去除量很少. 进水氨氮质量浓度的增大和水力停留时间的降低都会导致出水氨氮质量浓度增大. 此外,模型对进水氨氮质量浓度较低时的沿程出水氨氮质量浓度具有很好的预测效果; 当进水氨氮质量浓度较高时,预测值略低于实际结果. |
| 英文摘要 |
| This study investigates the biological aerated filter (BAF) of a marine recirculating aquaculture system, which is important to remove harmful ammonia and organics. A model, characterizing the ammonia transformation along the BAF, was established on the basis of the principle of adsorption and the first order reaction bio-film. Experiments were performed and verified the effectiveness of the proposed model. The target BAF was packed with bamboo ring for 70 cm high. Study under the conditions ［pH 7.1-7.6, DO 5-7 mg·L-1, gas water ratio about 20 ∶1, organic load about 4 g·(m3·h)-1 ］ shows that ammonia is removed significantly under the 10 cm height of medium, while less ammonia is removed between 10-70 cm. Experimental results confirm that the model predicts the ammonia concentration along the BAF accurately with a low influent ammonia concentration, but the predicted value is slightly lower than the true value with a high influent ammonia concentration. Study on ammonia concentration along the BAF reveals that the effluent ammonia concentration increases along with either the increment of the influent ammonia concentration or the reduction of the hydraulic retention time. |
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