CAUSES OF ACCELERATED PHYSICAL DETERIORATION OF A REINFORCED CONCRETE EQUALIZATION TANK IN THE BUILDING OF LOCAL WASTEWATER TREATMENT FACILITIES OF A PHARMACEUTICAL ENTERPRISE
DOI:
https://doi.org/10.31650/2786-6696-2026-17-34-41Keywords:
local wastewater treatment facilities, equalization tank, physical deterioration, concrete corrosion, structural durability, technical inspection, reinforced concrete structures.Abstract
The article investigates the causes of accelerated physical deterioration of a reinforced concrete equalization tank in the building of local wastewater treatment facilities (LWTF) of a pharmaceutical enterprise. The study demonstrates that the degradation of concrete structures results from the combined effects of chemical, physicomechanical, biological, and operational factors.
The operating features of the equalization tank, which provides the reception, temporary storage, and equalization of industrial wastewater with irregular inflow, are analyzed. The main factors affecting the durability of reinforced concrete structures are identified, including concrete chemical corrosion, reinforcement corrosion, biogenic sulfuric acid corrosion, cyclic hydrostatic loading, deterioration of protective coatings, and violations of the prescribed operating conditions.
Based on the analysis of recent national and international studies, together with the results of an in-situ technical inspection, the most vulnerable areas of the equalization tank were identified. These include the variable water level zone, the wall-to-base slab joints, pipeline penetration areas, and the gas space above the wastewater surface. It was determined that the above-water zone exhibits damage to the surface layer of concrete, delamination of the protective waterproofing, condensation, and slimy deposits. Laboratory analysis of corrosion products confirmed the acidic nature of the environment and the presence of sulfate ions. The detected damage and operating conditions indicate the development of biogenic sulfuric acid corrosion associated with the formation of hydrogen sulfide and its subsequent oxidation in the gas space of the tank.
The obtained results confirm the necessity of regular technical monitoring, timely restoration of anticorrosion protection, and the application of modern wastewater quality monitoring methods to ensure the reliable long-term operation of reinforced concrete equalization tanks at local wastewater treatment facilities of pharmaceutical enterprises.
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