Sewage treatment plants (hereinafter referred to as the WWTP) of the Pokrovvodokanal Enterprise are a key element of the Pokrov city wastewater system, providing complete biological treatment of wastewater from the population and industrial enterprises. The project envisages the reconstruction of the WWTP with a capacity of 25 thousand m3/day, which will ensure the treatment of the entire volume of wastewater in the city. The physical wear of technological structures is 90% The reconstruction is planned to be carried out by four start-up complexes. 1st start-up complex: • Mechanical wastewater treatment plant of the M-Combi type (ECOINVEST), which is located in the designed building. • Reconstruction of the drainage pumping station, laying of the drainage pressure pipeline to chamber 18. • Construction of the domestic sewage treatment plant from the existing WWTP structures. Laying of the sewage pressure pipeline to chamber No. 18. • Reconstruction of the chlorinator. Including installation of a video surveillance system in the building. • Replacement of existing oil transformers TMG-400kVA, 6/0.4kV (2 pcs.) of the required capacity in the ZRU-6kV of the production building • External water supply and sewage • External power supply • External electric lighting. Provide for the installation of motion sensors in the external electric lighting system. • External video surveillance system, along the perimeter of the OSK • Provide for the restoration of sections of the fence 47m long in the area of the drinking water metering chamber and 62m long in the chlorinator area. Accept for installation of a fence of the "Europarkan" type, H=2.5m. 2nd start-up complex: • Reconstruction of distribution chamber No. 1 • Biological treatment facilities (repair of reinforced concrete structures, replacement of tubular aerators with an aeration system with disk diffusers, airlifts, replacement of air ducts in accordance with the required performance); • Reconstruction of the production building with the installation of a backup blower and replacement of FG216/24 pumps and piping. Replacement of lifting equipment. Replacement of heating and ventilation systems, water supply and sewage, power supply, security alarm. Including installation of a video surveillance system in the building. • Replacement of external networks of technological pipelines for supplying raw sludge to the mechanical dewatering building and excess sludge to sludge platforms. • External water supply and sewage system, taking into account the change in the water supply inlet in building 7. • Dismantling of existing sludge platforms and restoration of the calculated productivity. The calculation is made as for emergency platforms.11 Change Qty . No. Doc. Signature Date Letter 25 -4378 - ZP Letter Inv. No. Sub. Signature and date Replaced inv. No. 3rd start-up complex: • Reconstruction of the mechanical sludge dewatering shop. Replacement of the FG 57/57-9.6 slurry pump discharge pumps. Replacement of lifting equipment. Replacement of heating and ventilation systems, water supply and sewage, power supply, security alarm. Including installation of a video surveillance system in the building. • External water supply and sewage system, taking into account the change in the water supply inlet in building 10. 4th launch complex: • Reconstruction of the buildings of the agricultural complex, laboratory. Replacement of heating and ventilation systems, water supply and sewage, electricity supply, security alarm. • Installation of a modular boiler house with the capacity necessary for the heating needs of the existing buildings, fuel - dewatered sludge certified for this application. • External underground heat supply networks for heating: production building, mechanical dehydration building, agricultural complex, laboratory, chlorination. • External networks of technological pipelines for supplying raw sludge to the mechanical dehydration building and excess sludge to the sludge sites. • Repair of building structures of the secondary treatment building. It is planned to replace lighting. • Replacement of existing pipelines of treated wastewater Ø700 130 m long.

Problems: - high degree of wear and tear of structures and equipment of storage facilities; - insufficient efficiency of sedimentation of suspended solids, which leads to increased load on the biological treatment stage; - significant energy losses and increased operating costs due to outdated equipment. Solution: The implemented reconstruction of the Sewage Treatment Plants will allow: - stable functioning of the wastewater system, reduction of risks of environmental pollution and morbidity of the population; - reduce operating costs and emergency repairs; - extend the service life of structures; - increase the efficiency of equipment use; - reduce the concentration of suspended solids and organic impurities in wastewater; - reduce pollution discharges into the Bazavluk River.