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Microbial disinfection of seawater using hydrodynamic cavitation

机译：水力空化对海水进行微生物消毒

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Hydrodynamic cavitation has been effectively proven to be an efficient advanced oxidation process on an industrial scale. The utility of hydrodynamic cavitation for microbial disinfection of seawater has been reported in this work. Seawater is used as cooling water in refineries and nuclear power plants or as ballast water in the shipping industry. Various norms and regulations of the International Maritime Organization (IMO) make it compulsory for ship owners to treat the ballasting seawater before discharging it into the sea. Also, if the seawater is not properly treated, it causes biofouling which affects the performance of cooling tower and other heat transfer equipments. It has been observed through our study that, hydrodynamic cavitation can be effectively used for microbial disinfection of seawater. Effectiveness of different types of cavitating devices for the extent of disinfection was studied. It was conclusively proved that, slit type of geometry consumes 40% less energy compared to cylindrical geometry for similar extent of seawater disinfection. A combination of the conventional treatments of water disinfection such as chlorination and thermal treatment with hydrodynamic cavitation was found to increase the overall rate of disinfection significantly. Rate of reaction almost doubles when 5 ppm hypochlorite was used as disinfectant with the combination of cavitation compared to when only 5 ppm of hypochlorite was used. Similarly the rate of disinfection increases 2.5 times at 50 degrees C in combination with cavitation compared to when, only 50 degrees C was maintained and disinfection was carried out. (C) 2015 Elsevier B.V. All rights reserved.
机译：水力空化已被有效证明是工业规模上有效的先进氧化工艺。在这项工作中已经报道了利用流体动力空化技术对海水进行微生物消毒。海水在炼油厂和核电站中用作冷却水，在航运业中用作压舱水。国际海事组织（IMO）的各种规范和条例规定，船东必须将压载海水排放到海中之前对其进行处理。另外，如果海水处理不当，会导致生物积垢，从而影响冷却塔和其他传热设备的性能。通过我们的研究已经观察到，水力空化可以有效地用于海水的微生物消毒。研究了不同类型的空化装置对消毒程度的有效性。最终证明，对于类似程度的海水消毒，狭缝型几何结构比圆柱形几何结构能耗低40％。已发现将水消毒的常规处理方法（如加氯处理和热处理与水力空化处理）相结合，可显着提高总体消毒速度。与仅使用5 ppm的次氯酸盐相比，当使用5 ppm的次氯酸盐作为消毒剂并结合空化作用时，反应速率几乎翻倍。类似地，与仅保持50℃并进行消毒的情况相比，在50℃下结合空化，消毒速率增加了2.5倍。 （C）2015 Elsevier B.V.保留所有权利。

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