权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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，这是可能的，从烟道气中去除NO使用微藻培养系统。该系统的实际应用需要提高NO的脱除能力，稳定连续地脱除NO，并在室外条件下脱除NO。因此，在本研究中，进行了以下研究来评估该系统的实用性.研究了脱硝系统中的速率限制因素。基于此，可以通过改善培养条件来提高该系统对NO的去除能力.在光照条件下，NO可以持续去除。对于室外系统，重要的是在光暗循环下驱动该系统。研究发现，在光暗循环的暗期采用弱光照射，可以实现稳定连续的NO去除.通过对细胞内NO去除机制的研究表明，溶解态NO被细胞直接摄取，氧化为亚硝酸盐和硝酸盐，然后通过氮同化途径被消耗。NO对亚硝酸盐和硝酸盐的氧化能力可能是由光照条件下的光合作用和黑暗条件下的呼吸作用提供.研究了烟气中SOx对NO脱除的影响。结果表明，该系统可用于脱除低浓度SOx脱硫烟气中的NO。