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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >Electrochemical removal of ammonia, chemical oxygen demand and energy consumption from aquaculture waters containing different marine algal species
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Electrochemical removal of ammonia, chemical oxygen demand and energy consumption from aquaculture waters containing different marine algal species

机译：从含有不同海洋藻类的水产养殖水中电化学去除氨，化学需氧量和能源消耗

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Phytoplankton over-blooming and consequent die-off is one of the major contributory factors for ammonia and chemical oxygen demand (COD) loadings. In this work, electrolysis technology was applied to determine its ability to remove ammonia and total chemical oxygen demand (TCOD) in both laboratory-scale batch and continuous systems. Under an initially set voltage of 5 V, a constant current of 0.1 A was applied and different retention times were used for ammonia-removal experiments. Results showed that these conditions are not satisfactory in removing TCOD loadings contributed by algal cells. However, a retention time of 35.7 min was sufficient to remove 100% ammonia from algal-uncontaminated waters. Ammonia removals in waters containing Chlorella spp and Isochrysis spp were 87 and 68%, respectively, after 140 min of electrolysis. Energy consumption for ammonia removal in algal-free water was 50 W mg(-1) of ammonia. For waters containing Chlorella spp and Isochrysis spp energy consumptions were 67 and 85 W mg(-1) of ammonia, respectively. Interestingly, the applied mild electrolysis condition was just sufficient to control excess algal blooming and ammonia without increasing the dissolved COD and chlorine in shrimp grow-out ponds. This minimizes operating costs due the process requiring less energy. Furthermore, it was also found that electrolysis does not lower alkalinity. (c) 2005 Society of Chemical Industry.
机译：浮游植物的过度开花和随之而来的死亡是氨和化学需氧量（COD）负荷的主要促成因素之一。在这项工作中，电解技术被用于确定其在实验室规模的间歇式和连续式系统中去除氨和总化学需氧量（TCOD）的能力。在5 V的初始设定电压下，施加0.1 A的恒定电流，并且不同的保留时间用于脱氨实验。结果表明，这些条件在去除藻类细胞贡献的TCOD量方面并不令人满意。但是，保留时间35.7分钟足以从未受藻类污染的水中去除100％的氨。电解140分钟后，含有小球藻和等鞭藻的水中氨的去除率分别为87％和68％。在无藻水中去除氨的能量消耗为50 W mg（-1）的氨。对于包含小球藻和等鞭藻的水，能量消耗分别为67和85 W mg（-1）的氨。有趣的是，所施加的温和电解条件足以控制过量的藻华和氨气，而不会增加虾类成长期池塘中溶解的COD和氯。由于该过程需要较少的能量，因此可将运营成本降至最低。此外，还发现电解不会降低碱度。 （c）2005年化学工业协会。

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