MODELING OF THE PYROLYSIS PROCESS OF EXCESS ACTIVE SLUDGE TO OBTAIN CARBON SORBENT AND ITS APPLICATION FOR WASTEWATER TREATMENT
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
OOO «TU BIO»
2.
KNITU
3.
Belgorod State Technological University named after V.G. Shukhov
4.
Kazan National Research Technological University
5.
KNITU
Type:
Article
Pages:
from 80
to 88
Status:
Published
Received:
31.01.2026
Accepted:
31.01.2026
Published:
31.01.2026
Language:
Russian
Keywords:
EXCESS ACTIVATED SLUDGE, PYROLYSIS, MODELING, SOLID PYROLYSIS RESIDUE, METHYLENE BLUE, ADSORPTION
Abstract:
Research has been conducted on the pyrolysis of excess activated sludge formed during the biological treatment of wastewater. Brief information is provided on possible ways of using excess activated sludge in various sectors of the national economy. Certain indicators of wet and dried samples of sediment from biological wastewater treatment are determined. Thermodynamic studies were conducted and the temperature range (200-600 °C) in which the organic component of the dry matter of excess activated sludge decomposes was identified . Assumptions taken into account when modeling the pyrolysis process of sludge are presented, and the pyrolysis process of the studied raw material is modeled. The amount of gaseous, liquid, and solid products formed during pyrolysis is determined. The composition and highest heat of combustion of the solid pyrolysis residue are identified. The specific surface area, average diameter, and pore volume of the solid residue of various fractions are determined. The sorption characteristics of the solid pyrolysis residue in relation to the reference substance, methylene blue dye, are investigated. An isotherm of dye adsorption on the sorbent was constructed and calculated within the framework of the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models. It was determined that the process is most adequately described by the Temkin model, which indicates monomolecular adsorption. The calculated Gibbs energy indicates physical adsorption. It was concluded that the solid pyrolysis residue can be used as a sorbent for purifying wastewater from organic and inorganic contaminants.
Research has been conducted on the pyrolysis of excess activated sludge formed during the biological treatment of wastewater. Brief information is provided on possible ways of using excess activated sludge in various sectors of the national economy. Certain indicators of wet and dried samples of sediment from biological wastewater treatment are determined. Thermodynamic studies were conducted and the temperature range (200-600 °C) in which the organic component of the dry matter of excess activated sludge decomposes was identified . Assumptions taken into account when modeling the pyrolysis process of sludge are presented, and the pyrolysis process of the studied raw material is modeled. The amount of gaseous, liquid, and solid products formed during pyrolysis is determined. The composition and highest heat of combustion of the solid pyrolysis residue are identified. The specific surface area, average diameter, and pore volume of the solid residue of various fractions are determined. The sorption characteristics of the solid pyrolysis residue in relation to the reference substance, methylene blue dye, are investigated. An isotherm of dye adsorption on the sorbent was constructed and calculated within the framework of the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models. It was determined that the process is most adequately described by the Temkin model, which indicates monomolecular adsorption. The calculated Gibbs energy indicates physical adsorption. It was concluded that the solid pyrolysis residue can be used as a sorbent for purifying wastewater from organic and inorganic contaminants.
Keywords:
EXCESS ACTIVATED SLUDGE, PYROLYSIS, MODELING, SOLID PYROLYSIS RESIDUE, METHYLENE BLUE, ADSORPTION
EXCESS ACTIVATED SLUDGE, PYROLYSIS, MODELING, SOLID PYROLYSIS RESIDUE, METHYLENE BLUE, ADSORPTION
