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Study the Composition and Environmental Impact of Sewage Sludge
 
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1
Department of Ecology and Geology, Sh. Yesenov Caspian University of Technology and Engineering, Aktau, 130002, Kazakhstan
2
Department of Life Safety and Environmental Protection, M. Auezov South Kazakhstan University, Shymkent, 160012, Kazakhstan
CORRESPONDING AUTHOR
Samal Syrlybekkyzy   

Department of Ecology and Geology, Sh. Yesenov Caspian University of Technology and Engineering, Aktau, 130002, Kazakhstan
Alexandr Kolesnikov   

Department of Life Safety and Environmental Protection, M. Auezov South Kazakhstan University, Shymkent, 160012, Kazakhstan
 
J. Ecol. Eng. 2023; 24(3):315–322
 
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ABSTRACT
Abstract: The article examines the characteristics of sewage sludge and its impact on the environment. The description of technical installations, sludge sites in the city's sewage treatment systems, which are sources of unfavorable sanitary and epidemiological condition of the studied territory, is presented. A detailed analysis of the structure, composition and morphology of sludge sediment is given. It was found that the sludgepresents a loose, roughheterogeneous porous structure represented by the presence of a fibrous substrate with amorphous scaly-crystalline inclusions. During laboratory analyses of the composition of the dry residue, the presence of such types of heavy metals as chromium, manganese, nickel, copper, zinc, lead, cobalt, molybdenum, cadmium was revealed. The excess of permissible concentrations of chromium more than 7.1 at MPC – 6.0 by 1.18 times; copper more than 3.3 at MPC – 3.0 by 1.1 times; zinc more than 27.3 at MPC – 23.0 by 1.18 times; lead more than 34.3 at MPC – 32.0 by 1.07 times; cobalt more than 6.4 at MPC -5.0 by 1.28 times; molybdenum more than 6.9 at MPC – 5.0 by 1.3 times. Soil analysis revealed a pH of 7.1, which is neutral, may be optimal for plants; the concentration of calcium, iron and chromium does not exceed the established maximum permissible values. When analyzing the air environment of the territory of the treatment facilities, the presence of gaseous pollutants, such as methane, ammonia, nitrogen dioxide, hydrogen sulfide, carbon monoxide, was established.It has been established that anthropogenic sludge landfills are sources that create a technogenic load on the atmospheric air, polluting it with methane, since the concentration of methane exceeds the MPC by more than 3 times.