a number of attempts to trap the phosphorus to aluminum in the Baltic sea. Björnöfjärden during the seven years since, and the effect was immediate.
" Just over a month after the treatment, decreased the content of phosphorus in the bottom waters, with around 90 per cent. It really is super efficient. Today, it is an average of one-half as much phosphorus left in the fjärdens of water, as compared with before the operation. However, we have also reduced the flow area from the Björnöfjärden by improving the poor cost sewerage, have made various measures in the agricultural and horse farms, " says Linda Kumblad, one of the people responsible for the project.
Aluminum is naturally present in the sediment, and add more aluminum to help enhance the natural process in order to bind the phosphorus that would otherwise enter the water and contribute to eutrophication. Aluminum is also used for cleaning the drinking water, so it is not dangerous in and of itself, if used in the right way.
the Aluminium can be toxic to aquatic organisms if it appears free in the water, and it will do it only if the water is very acidic or alkaline. We used to shoot aluminiumlösningen directly into the sediment in the Björnöfjärden, in order to bind the phosphorus, where, and to free the aluminum in the water.
" There is no one who wants to. It is not possible to make a aluminiumbehandling in the Östersjöskala. On the other hand, we have shown that it is possible to do in a confined coastal areas with very good results, and now it is done in a full day. In the future, perhaps at a few other places along the coast, however, it is important to don't rush and assess it properly.
" It has worked very well in the seas, and in the Björnöfjärden see, we don't have the negative side-effects. In a few cases, problems have emerged in the course of treatment in which the pH has changed dramatically, and the water has become too acidic or alkaline. Since the release of aluminum, and can be the cause of the problem. This has not happened in Sweden.
" We don't use the aluminiumbehandling as a quick fix, but as for a final polishing, as we have done all the other things, in order to prevent the phosphor in the country to reach the water. In Sweden you can get a subsidy of up to 90 per cent of the cost. When should the counter be placed in all of the drains have very good treatment and all of the other steps that are needed in the area surrounding the water have been made. It is very important that we don't fill it with a bunch of new phosphorus from the land. If so, we are back in the same situation again, maybe in ten years ' time.
" It's all about how quickly you would like to see the effect of the water. The input of phosphorus to the Baltic sea have decreased in the last few decades, and it is down to the same level as in the 1950's. The environment has improved in some coastal areas, but many areas remain övergödningsproblemen. The recovery is slow because the phosphorus that is already in the ocean, transformed, year after year, and övergöder watered. The baltic sea's slow water exchange, does it take a long time to ”wash out” of the phosphor. We can bind and neutralize the phosphorus that is already in the bay, it can recover faster and get back on track.
for more information, see the Aluminum do the full day medelhavsturkos.
