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The main priorities of Ukraine's foreign policy in the field of environmental protection have always been political and institutional rapprochement with the European Union (EU). In this regard, Ukraine has made commitments to gradually harmonize national legislation with EU legislation. Therefore, the "Directive 2000/60/EC of the European Parliament and of the Council establishing a framework for the Community action in the field of water policy" which aimed at improving the protection and improvement of the aquatic environment through specific measures to reduce discharges, emissions and losses of priority substances, as well as the cessation or elimination of discharges, emissions and losses of hazardous substances, currently requires active implementation. Therefore, the issue of reconstruction of wastewater treatment plants at the enterprise of SE "Antonov" is very relevant. An analysis of the operation of wastewater treatment plants at the enterprise of SE "Antonov" was performed. Today, the entire complex of treatment facilities needs reconstruction with design work to implement the latest technologies for extraction of petroleum products from water and surface wastewater treatment, as well as the organization of self-flowing water treatment regime. Measures for the reconstruction of treatment facilities are proposed. The technology of operation of treatment facilities on the principle of self-flowing water treatment regime is offered, which will allow saving energy resources. An improved technology for extraction of petroleum products, floating and suspended solids from wastewater, and purification of effluents for dissolved petroleum products removal is proposed. Proposed measures will improve the environmental situation in reservoirs where treated water flows.

Small sewage wastewater treatment plants are used for treatment of domestic wastewater from individual residential houses, small schools, roadside cafes, restaurants, small railway stations, camping sites, etc., where there is no centralized sewage network. In cases when there is a limited space for the installation of small-scale treatment facilities, authors suggest using of septic tanks and drainage wells. Sewage effluents are collected with gravity force, without using electricity. Usage of proposed constructions does not cause pollution of soils and underground water horizons. Sanitary environment is stable and predictable.

The two-stage system of surface water purification in field conditions in a portable device for water purification is considered. In the first stage, water is filtered through a hair pad, and on the second it is filtered through zeolite, shungite or track membrane and disinfected internally. In a portable device, water can be cleansed from heavy metals, chemicals, pesticides, phenols, organic contaminants, nitrates, petroleum products, ammonia, viruses, pathogenic microorganisms.