The use of carbonate sludge for cleaning karst Lake Bol’shoye Goluboye
L.A. Nikolaeva, R.Ya. Iskhakova
Section: Problems of environmental protection
The technology for cleaning lake Bol’shoye Goluboe (Russian Federation, Republic of Tatarstan) with carbonate sludge, a waste of water treatment generated at thermal power plants is proposed. Inadequate water works, that are held on Bol’shoye Goluboe lake had a strong anthropogenic impact. The destruction of habitats and representatives of aquatic vegetation and benthic organisms themselves, as well as a change in the chemical composition of water are the consequences of the negative impact. The article presents experimental results of Bol’shoye Goluboe lake’s waters in the values changings of total hardness, permanganate oxidizability, concentration of sulfates, iron, pH value, biological oxygen demand five days (BOD5) over 20 years. The surface introduction of carbonate sludge into the lake’s water will allow changing the chemical composition of the water by neutralizing the acidified waters of the lake. It will entail the restoration of the natural flora and fauna of the lake’s waters. The sorption capacity of the sludge with respect to various impurities was also established. It allows to increase the efficiency of the natural biological treatment and the adsorption cleaning of the lake from various impurities.
The article presents a toxicological assessment of waters containing carbonate sludge on the basis of water quality express control for acute lethal toxicity of the fish species Poecillia reticulata Pet. and crustaceans Daphnia magna Str. Based on the results of the conducted biotesting, it was found that the water extract of the sludge does not have an acute toxic effect on fish and crustaceans of these species. The sludge is proposed to be introduced into the lake by surface application using two-disc spreaders. According to the results of the studies, the prevented environmental damage to the reservoir of Bol’shoye Goluboe lake will amount to 390.6 thousand rubles / year.
Keywords: purification of natural waters, carbonate sludge, alkalization of waters, sorption material, calcareous material.