ArmInfo.The process of self-purification of Lake Sevan continues, Armenian Healthcare Minister Arsen Torosyan said on his Facebook page.
According to Torosyan, this observation is based on the study of water samples taken from 11 different parts of Lake Sevan. "In the 2nd while there are insignificant deviations from the norm, but they will also come back to normal in the coming days, because our study recorded the dynamics of self-purification," he wrote.
According to the minister, the research will be of a long-term nature, they will be announced later.
To recall, yesterday Employees of the tourist units of Lake Sevan began to protest, blocking the Yerevan-Sevan highway and part of the roads leading to the village of Gagarin, bypassing the lake. The protesters demand that the Ministry of Healthcare and the members of the government issue an official denial of information that swimming in Lake Sevan is unsafe for health. To recall, a few days ago, the Ministry of Healthcare of Armenia issued a statement in which it asked citizens not to swim in places where water pollution by blue-green algae was observed, listing the symptoms that people may have after swimming in such water.
Meanwhile, according to Knarik Hovhannisyan, a well-known ecologist in Armenia, an expert in water resources, this is not about the so-called "waterlogging" of Sevan, but about the lake's eutrophication process. The first signs of a similar Sevan occurred in the19 40s and196 60s of the last century. The causes of Sevan eutrophication lie in the increase in the lake water temperature, as a result of which the deep layer is reduced, which leads to a change in the habitual biodiversity. This process is also promoted by sewage from the entire drainage basin, which contains, in addition to municipal wastewater, household waste, fertilizers, pesticides, etc., that are washed away from irrigated lands, also contributes to this process. In this sense, according to the expert, the work of only three treatment facilities, which perform only mechanical water treatment, is completely inadequate.
A very important and dangerous factor for the lake eftrophication is the small hydroelectric power stations built on the rivers flowing into the lake, which often take water from the rivers above the allowed limit, thus not providing the necessary amount of environmental protection. Often, these structures lack the so- called "fish walkers" necessary for spawning fish. As a result of all this, according to the ecologist, in recent years there has been a disappearance of the cancer population in the lake and some species of fish, which are natural nurses of Sevan.
Not a small " input" to the lake pollution is brought by several hundred tourist facilities around the perimeter of the lake, which practically do not have sewage treatment plants and wash their drains directly into the lake. There are also several dozen fish farms that artificially grow trout, which use feed of unknown composition - antibiotics, preservatives, dyes, etc.
As a result, these processes led to the fact that the coastal strip of the lake became unsuitable for recreational use, as well as for irrigation purposes. These factors contribute to the disturbance of the nitrogen-phosphorus balance, which leads to lake eutrophication.
According to Hovhannisyan, it is urgent to stop the flow of sewage into the lake without their prior biological treatment, to force hydropower plants to begin work in the framework of approved projects and contracts without violating environmental protection requirements, and prohibit artificial fish farming in the lake. "We are already witnessing the global warming of the climate and recklessly adding to this the anthropogenic impact on the aquatic ecosystem of the pearls of Armenia," summarized Knarik Hovhannisyan.