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首页> 外文期刊>Aquacultural Engineering: An International Journal >Evaluation of ozonation on levels of the off-flavor compounds geosmin and 2-methylisoborneol in water and rainbow trout Oncorhynchus mykiss from recirculating aquaculture systems.
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Evaluation of ozonation on levels of the off-flavor compounds geosmin and 2-methylisoborneol in water and rainbow trout Oncorhynchus mykiss from recirculating aquaculture systems.

机译：臭氧化对循环水产养殖系统中水和虹鳟 Oncorhynchus mykiss 中异味化合物土臭素和2-甲基异冰片醇水平的评估。

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摘要

Common "off-flavors" in fish cultured in recirculating aquaculture systems (RAS) are "earthy" and "musty" due to the presence of the off-flavor metabolites geosmin and 2-methylisoborneol (MIB), respectively. Previously, ozone addition has been applied to RAS at relatively low doses to break refractory organic molecules (i.e., reducing color), microflocculate fine particulate matter (i.e., increasing solids removal), and oxidize nitrite to nitrate, but the effect of ozone addition at these dosing rates on levels of off-flavor compounds was unknown. Ozonation has been used in municipal drinking water facilities to reduce the levels of these compounds, to improve water taste, and to subsequently reduce consumer complaints. In this study, the effects of ozone addition to the inlet water of the RAS culture tanks on levels of geosmin and MIB in the culture water and fish flesh were evaluated. Water and rainbow trout (Oncorhynchus mykiss) samples were obtained twice after maximum feed rates were reached during a 6-month grow-out period. Results indicated that ozone addition to maintain an oxidation reduction potential of 248 mV (<1 micro g/L of ozone residual) did not significantly reduce levels of these off-flavor compounds in the water and fish flesh, though it did significantly improve culture tank water quality. Higher dosages of ozone might be beneficial in removing geosmin and MIB in the RAS water, but the inclusion of ultraviolet (UV) irradiation would be required to prevent mortality associated with ozone toxicity.
机译：由于存在异味代谢产物土臭味素和2-甲基异冰片醇（MIB），在循环水产养殖系统（RAS）中养殖的鱼类中常见的“异味”是“土”和“麝香”。以前，已经以相对较低的剂量将臭氧添加到RAS上，以破坏难熔的有机分子（即减少颜色），微絮凝细颗粒物（即提高固体去除率）并将亚硝酸盐氧化为硝酸盐，但是臭氧添加的作用是这些关于异味化合物水平的加药速度尚不清楚。臭氧已被用于市政饮用水设施中，以减少这些化合物的含量，改善水的味道，并随后减少消费者的抱怨。在这项研究中，评估了在RAS培养槽的进水口添加臭氧对养殖水和鱼肉中的土臭素和MIB含量的影响。在六个月的成长期中达到最高进料速度后，两次采集水和虹鳟鱼（Oncorhynchus mykiss）。结果表明，添加臭氧以保持248 mV的氧化还原电位（<1 micro g / L的臭氧残留量）不会显着降低水和鱼肉中这些异味化合物的含量，尽管确实可以显着改善养殖池水质。较高剂量的臭氧可能对去除RAS水中的土臭素和MIB有益，但是需要加入紫外线（UV）辐射以防止与臭氧毒性有关的死亡率。

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