Development of water purification system with marine biomass and civic collaboration for eutrophic canal in urban area

2012年，新型净水设施在长崎运河建成。该设施由三种净化技术和人员组成，他们从海藻中提取营养物质并将其用于堆肥。我们评估了它的性能和ESD对孩子父母的影响。结果表明，夏季白天水体对氮的净化能力为69%。我们还进行了夜间使用LED增加净化能力的现场实验，并估计了LED在藻类通道中的安装间隔距离。ESD非常有效，37%的儿童家长改变主意参加净化活动。根据问卷调查，父母改变主意的原因有两个；营养吸收的效果和活动被视为发展亲代关系的好机会。这意味着该设施不仅具有水净化功能，而且还具有良好的人际关系。

New type of water purification facility was constructed in Amagasaki Canal in 2012. The facility was consisted with three type purification technologies and attendance of people who picked up nutrient with marine algae and used it for compost. We evaluated its performance and ESD's effect to kid's parents. As a result, we observed water purification capacity rate was 69% of nitrogen in summer daytime. We also carried out a field experiment for increasing purification capacity in nighttime using LED and we estimate the distance of installation interval of LED in algae channel. ESD was very effective and 37% of children's parents changed their mind to join the purification activities. According to questionnaire, there are two reasons why the parents changed their mind; effect of nutrient pick up and the activity regarded as a good chance to develop a parental relationship. This results mean the facility have a function not only water purification but also develop good human relationship.