Various biological nitrogen removal processes have been developed for energy saving in the municipal wastewater treatment plant (MWTP). Recently, a nitrogen removal method using microalgae is emerging as an innovative method. This study has addressed how much of nitrogen was removed by microalgae and how much of electric energy was saved at the same time. For the verification purpose, a long term operation was carried out in a round shape reactor to identify an optimum condition of the highest energy saving rate along with the highest nitrogen removal rate, determined by adjusting time using a light emitting diode (LED) to activate photosynthesis reaction of microalgae and aeration time in a laboratory scale. As a result, it was found that 6.6% or up to 23.8% of energy was saved with biological reaction of microalgae, compared with the traditional nitrogen removal process based on nitrification–denitrification. This indicated that the operation can be flexibly conducted according to the specific operating conditions from each MWTP and its own target energy independence rate, and the findings can be used as a base data for applying such methods using microalgae to the actual treatment plant.

中文翻译：

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优化运行中的微藻生物反应器的空间优化，以实现脱氮和节电

为了节省市政污水处理厂（MWTP）的能源，已经开发了各种生物脱氮工艺。近来，使用微藻的脱氮方法正在作为一种创新方法出现。这项研究已经解决了微藻去除了多少氮气以及同时节省了多少电能。出于验证目的，在圆形反应器中进行了长期运行，以确定最高节能率和最高脱氮率的最佳条件，该条件是通过使用发光二极管（LED）激活时间来确定的在实验室规模的微藻光合作用反应和通气时间。结果发现，微藻的生物反应节省了6.6％或高达23.8％的能量，与基于硝化-反硝化的传统脱氮工艺相比。这表明可以根据每个MWTP的特定操作条件及其自身的目标能量独立率灵活地进行操作，并且该发现可以用作将此类使用微藻类方法应用于实际处理厂的基础数据。