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

Development of Water Pollution Control System for Urban Lakes using Algae Trap

利用藻类捕捉器开发城市湖泊水污染控制系统

基本信息

批准号：
60550385
负责人：
YAMASAKI Koreyoshi
金额：
$ 1.22万
依托单位：
FUKUOKA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550385/
关键词：
Algae-Trap Eutrophication Water-Pollution エントロピー

项目摘要

Accumulations of floating algae, known as water-blooms, cause nuisances in lakes and other water impoundments because of their unsightly appearances and the release of noxious taste and odors as they decompose. This is called water pollution by eutrophication. A few methods exist such as application of copper ions, but they cause secondary water pollutions like massive fish-kills.We developed a harvesting system named algae trap. It consists of a weir as an inlet and a separation tank with outlet. Floating algae are accumulated by wind. By setting the trap on the lee-ward shore, we can harvest them in high density without any energy because they are carried into the trap by overtopping wave and then separated from water in separation tank by autofloatation.We carried out on-site and model experiments on trapping. The results of onsite experiments show the system can harvest water-blooms effectively at low cost.It is very interesting that the result of model experiments showed that floating particles flowed into the trap as several times much as ones predicted by potential analysis. The SMAC method was modified to solve navierstorks equation with the surface tension. This analysis showed that marangoni effect acceralated the particle flow.Vertical migration speeds of water-blooms were measured to design the separation tank. After that densities of reflaoted algae were measured to know the efficiency of separation. Specific filtration resistances of algae were also measured. These results show that it is easy to separate algae from water but some pre-treatment may be need to filtrate refloated algae for resources recovery.

漂浮藻类的积累（称为水华）会对湖泊和其他蓄水池造成滋扰，因为它们的外观不雅观，并且在分解时释放出有毒的味道和气味。这就是所谓的富营养化水污染。目前有一些方法，如铜离子的应用，但它们会造成二次水污染，如大量的鱼类死亡。它由作为入口的堰和具有出口的分离槽组成。浮游藻类是由风聚集而成的。将捕集器设置在背风海岸，利用漫顶波浪将其带入捕集器，在分离池中进行自浮分离，无需任何能量即可实现高密度捕集。现场实验结果表明，该系统能以较低的成本有效地收集水华，而模型实验结果表明，进入捕集器的浮游颗粒是电位分析预测值的几倍。对SMAC方法进行了改进，使其能求解含表面张力的Navierstorks方程。分析表明，马兰哥尼效应加速了颗粒的流动，并通过测量水华的垂直迁移速度来设计分离槽。然后通过测定回流后藻的密度来了解分离效果。还测量了藻类的比过滤阻力。实验结果表明，藻类的分离是容易的，但可能需要进行一些预处理以过滤再浮的藻类以回收资源。