A Study on the Treatment System of Circulating Seawater using Eco-engineering Process

现有的循环水产养殖系统在处理海水时几乎是循环的。因此，虽然设备中的净化机制很重要，但在现有的系统中，很难完全处理养殖水，通过海水交换来维持水质。现有水产养殖系统的缺陷是根本没有考虑到自然界的生态系统。将生态系统的物质循环纳入水产养殖系统，即循环系统，才能建立良好的处理系统。此外，作为生态系统的初级产品，海藻被认为能有效地去除带来富营养化的营养盐、氮和磷。然后，本文构建了引入Easy生态系统的实验系统，并考虑了其有效性。为了尽可能减少实验系统中的氮气负荷量，引入了IWAMUSHI和AOSA填充滤床。AOSA的光合作用减少了养殖水体中的溶解氮。通过将生态系统的概念纳入水产养殖系统，使具有少量氮负荷的封闭式循环系统成为可能。

The existing recirculating aquaculture systems are what almost circulates while treating the seawater. Therefore, although the purification mechanism in the equipment is important, in the existing system, it is difficult to treat breeding water completely, and water quality is maintained by exchange of seawater. The fault of the existing system of the aquaculture is not taking the ecosystem in the nature into consideration at all. The excellent treatment system can build by including material circulation of the ecosystem in aquaculture system, i.e., the circulation system. Moreover, it is thought that the seaweeds which are primary products in an ecosystem is effective in removal of the nutrient salts which bring eutrophication, nitrogen, and phosphorus. Then, in this paper, the experimental system that introduced the easy ecosystem was built and the effectiveness was considered. Filter bed filled up with IWAMUSHI, and AOSA are introduced in order to be possible curtailment of the amount of nitrogen loads in the experimental system. The dissolved nitrogen to the breeding water is cut down by photosynthesis of AOSA. By including the concept of an ecosystem in the aquaculture system, the closed recirculating system with few amounts of nitrogen loads became possible.