The use of technical oxygen instead of air in biological treatment plants can increase their oxidizing ability. Bioreactor-clarifier is a new technical device for tertiary wastewater treatment with the use of oxygen. The design, operation principle and research results of the bioreactor-clarifier for tertiary treatment of urban wastewater are given The use of bioreactors-clarifiers for tertiary treatment of urban wastewater using dissolved technical oxygen allows intensifying the process of biochemical oxidation of organic substances in a contact weighed load and increasing the efficiency of wastewater treatment by BOD and other components.

Siberian surface water and groundwater are characterized by low temperatures for a long year period. Many groundwater sources’ organic composition are formed of soil and peat humus, marsh feeding of rivers, decomposition of plankton, higher water, and soil grass in reservoirs and lakes. Organic colloids in natural waters and in humic substances give the color of water. It’s yellowish coloration of varying intensity. Thus, the Om River’s water color in the city of Kuibyshev in the Novosibirsk Region is 500 degrees with feculence of less than 3 mg/l. A number of underground water sources also have an increased content of organic contaminants caused by peat bogs at great depths and high water colority with low turbidity. For example, the water color is up to 1500 degrees in the Namtsy village of the SAHA-Yakutia Republic. In addition, underground water and, to a greater extent, surface water are often characterized by a high content of iron (up to 20 mg/l), manganese (up to 4 mg/l), and other impurities of natural and anthropogenic origin. Iron and manganese are in natural waters in the form of mineral or organic complex compounds of humic or some fatty acids. In the second case, these waters are with increased oxidizability and rather aggressive nature. In particular, the iron content is 3 mg/l, manganese is 1 mg/l, the permanganate oxidizability is 50 mg/l in the water of the Om River.

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Our scientific research aim was to develop a technological scheme for drinking water preparation, taking into account the natural waters quality and the water supply conditions of small populated areas in the Far North of Russia. Preliminary experimental studies’ results of a new treatment technology, carried out on a pilot installation in the production conditions of the Yakutia settlement with the natural water purification of the river Vilyuy are presented in the article. Studies of drinking water preparation technology, developed by NSUACE (Sibstrin), Novosibirsk, show that it ensures the drinking water quality that meets regulatory requirements, minimizes the cost of building and operating water treatment plants. The cleaning technology is as follows: the source water is supplied to the source water tank from a water supply source. Next, water is supplied to the electrochemical processing unit by the booster pump, consisting of two electrocoagulators. In the electrocoagulators, the aluminum electrodes slowly dissolve; aluminum hydroxide flakes are formed; sorbing impurities of iron; manganese and other contaminants from the treated water.