| 研究実績の概要 |
Besides the optimization of hydrothermal pretreatment and ammonia stripping, we further investigated the effect of different operation parameters on P and N accumulation into aerobic granular sludge and their recovery from synthetic fermentation liquor and various domestic wastewaters. The feasibility of hydrothermal pretreatment and ammonia stripping have been tested on both waste activated sludge and livestock manure. We also did some preliminary works on the possibility of using the developed aerobic granule system to replace the widely used Japanese Johkasou systems, achieving low investment and maintenance costs and better effluent quality. The most important and interesting finding in this year is that the dominant volatile fatty acid in the fermentation liquor, acetic acid was found to favor P accumulation into the P-rich granules during the treatment of synthetic fermentation liquor (Bioresource Technology, 2016(214)596-603). And Fe2+ addition into the influent could enhance P accumulation and its bioavailability (under review). In addition, to achieve the same pollutants removal, aerobic granule-based wastewater treatment system was proven to reduce electricity consumption by 30% and bioreactors volume by 74% in comparison to Johkasou systems (conference presentation).
From April 2015 to the present, besides 17 conference presentations, we published 5 related papers in the top ranking international journals in this research field. Currently, another 5 related papers are still under review.
|
| 今後の研究の推進方策 |
During the final year of this project, we plan to extend our focus on the stability of algal-bacterial granules which appeared in most of our experimental reactors. According to our preliminary results (conference presentations), the algal-bacterial granules system will be more promising due to its low energy consumption, better effluent quality and reduced greenhouse gases emission. These experiments will be conducted under different illumination conditions and influent compositions by operating the reactors in continuous or batch mode. The target of this year is to find some suitable operation strategy to stably operate this new granular system with high nutrients removal and to produce algae biomass with more potential usages.
|
