Studies on practical removal system of NOx from boiler flue gas using microalgae

微藻脱除锅炉烟气NOx实用化系统研究

基本信息

批准号：
09555254
负责人：
MIYAMOTO Kazuhisa
金额：
$ 8.83万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Nitric oxide (NO) is a main component of NOx in flue gas. We found that it was possible to remove NO from flue gas using the microalgal culture system. For practical application of this system, improvement of NO removal ability, stable and continuous NO removal, and NO removal under outdoor conditions are required. In this study, therefore, the following investigations were done to evaluate practicability of this system.1. Rate limiting factors in the NO removal system was investigated. Based on that information, the ability of NO removal in this system could be increased by improving cultivation conditions.2. NO could be continuously removed under light condition. For outdoor system, it is important to drive this system under light-dark cycle. It was found that stable and continuous NO removal was successfully achieved by illuminating weak light during dark period in the light-dark cycle.3. By investigation of NO removal mechanism in the cells, it was shown that dissolved NO was directly taken in the cells, oxidized to nitrite and nitrate, and then consumed by the nitrogen assimilation pathway. The oxidation ability of NO to nitrite and nitrate might be supplied by the photosynthesis under light condition and the respiration under dark condition.4. The effect of SOx on NO removal from flue gas was investigated. It was shown that this system was available to remove NO from the desulfurized flue gas containing low concentration of SOx.

一氧化氮（NO）是烟气中NOX的主要成分。我们发现，有可能使用微藻培养系统去除烟气中的NO。为了实际应用该系统，没有提高拆卸能力，稳定和连续的拆卸能力，并且在室外条件下不需要拆除。因此，在这项研究中，进行了以下研究以评估该系统的可实用性1。研究了无去除系统中的速率限制因子。基于该信息，可以通过改善培养条件来提高该系统中无去除的能力。2。在光条件下可以连续删除不。对于室外系统，在浅黑暗周期下驱动该系统很重要。人们发现，通过在黑暗周期中的黑暗时期照亮弱光，无法成功实现稳定和连续的去除。3。通过研究细胞中的NO去除机制，表明溶解的NO直接在细胞中氧化，氧化为亚硝酸盐和硝酸盐，然后被氮同化途径消耗。 NO到亚硝酸盐和硝酸盐的氧化能力可能由光合作用在光条件下以及在深色状态下的呼吸提供。4。 Sox对未从烟气中去除的影响进行了研究。结果表明，该系统可从含有低浓度的Sox的脱硫气体中去除NO。