INTEGRATION OF COAGULATION-AEROBIC TECHNOLOGY INTO THE RECONSTRUCTION OF WASTEWATER TREATMENT PLANTS: ENGINEERING CALCULATIONS AND TECHNOLOGICAL RECOMMENDATIONS
DOI:
https://doi.org/10.31650/2786-6696-2026-16-93-101Keywords:
wastewater disposal, stabilization, wastewater, treatment plants, sludge, technology, water quality.Abstract
The article considers the possibility of improving the efficiency of wastewater sludge treatment by integrating coagulation-aerobic technology into existing aerobic mineralizers at sewage treatment plants. The relevance of the study is determined by the need to modernize outdated wastewater treatment plants designed in the 1970s–1990s, which exhibit low sludge thickening efficiency. The work aims to justify the design and technological solutions for the reconstruction of aerobic stabilizers by introducing a coagulant dosing unit and a reaction-mixing zone, thereby intensifying the processes of gravitational compaction and aerobic stabilization of sludge. The kinetics of gravitational compaction using aluminum-containing coagulants of the "OPTIPAC" type at a dose of 1% of the suspension volume were studied, and aerobic stabilization was carried out for 6 days. Based on the experimental dependencies obtained, engineering calculations of the aerobic stabilizer parameters for a wastewater treatment plant with a capacity of 10,000 m³/day were performed. The required stabilization volume, aeration parameters, reagent consumption, and dosing unit design characteristics were determined. It was shown that the actual volume of existing mineralizers significantly exceeds the calculated requirement, allowing the organization of additional technological zones without the construction of new facilities. The proposed technological scheme provides for the sequential implementation of coagulation, gravitational compaction, and aerobic stabilization of sludge within a single tank. The results of the study show that reagent treatment increases particle settling rate, reduces sludge moisture content, and reduces sludge volume. The results obtained can be used to reconstruct existing wastewater treatment plants in small and medium-sized settlements. They will help improve the energy efficiency and environmental safety of wastewater systems.
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